Iron sulfur clusters: Difference between revisions

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FAM96B is remarkably conserved throughout eukaryotes. It duplicated in the earliest metazoa, giving rise to FAM96A after the divergence of choanflagellates but before those of sponge, trichoplax, ctenophore or cnidarian. Both FAM96B and FAM96A were retained in all metazoan lineages. In vertebrates but not earlier diverging deuterostomes, FAM96A acquired an umistakable signal peptide, meaning it was no longer targeted to the cytoplasm. The species with the signal peptide are exactly those with an extra pair of invariant cysteines, suggesting a disulfide suitable for an oxidizing subcellular compartment such as endoplasmic reticulum.  
FAM96B is remarkably conserved throughout eukaryotes. It duplicated in the earliest metazoa, giving rise to FAM96A after the divergence of choanflagellates but before those of sponge, trichoplax, ctenophore or cnidarian. Both FAM96B and FAM96A were retained in all metazoan lineages. In vertebrates but not earlier diverging deuterostomes, FAM96A acquired an umistakable signal peptide, meaning it was no longer targeted to the cytoplasm. The species with the signal peptide are exactly those with an extra pair of invariant cysteines, suggesting a disulfide suitable for an oxidizing subcellular compartment such as endoplasmic reticulum.  


However, these new cysteines are not in proper crystallographic position to form a disulfide. However the new Cys99 and the long conserved near-terminal Cys155 may be oriented correctly. The positions of two Cys90, one from each monomer, may also be in position to form a disulfide, 2Fe-2S, or zinc ligand provided the protein is purified anaerobically or reconstituted using some sort of activity assay. The phylogenetic conservation of cysteines is explored in the alignment below.
However, these new cysteines are not in proper crystallographic position to form a disulfide, though the new Cys99 and the long conserved near-terminal Cys155 are within range and may form a disulfide under certain conditions. The positions of two Cys90, one from each monomer, may also be in position to form a disulfide, 2Fe-2S, or zinc ligand provided the protein is purified anaerobically or reconstituted using some sort of activity assay. The phylogenetic conservation of cysteines is explored in the alignment below.


The two encoded proteins both bind CIA01. However they must have distinct functions in vivo to account for retention of both proteins in so many lineages for so long. The usual explanations -- specialized time of expression during development or in differentiated populations of cells -- are not applicable to single-celled organisms. Since the signal peptide in FAM96A arose fairly late, it too cannot explain retention in earlier diverging species. (Note however tools that recognize signal peptides are not adequately trained on these species.) Since the duplication is restricted to metazoans (ie animals), it could possibly be associated with dietary, rather than diffusive, acquisition of iron.
The two encoded proteins both bind CIA01. However they must have distinct functions in vivo to account for retention of both proteins in so many lineages for so long. The usual explanations -- specialized time of expression during development or in differentiated populations of cells -- are not applicable to single-celled organisms. Since the signal peptide in FAM96A arose fairly late, it too cannot explain retention in earlier diverging species. (Note however tools that recognize signal peptides are not adequately trained on these species.) Since the duplication is restricted to metazoans (ie animals), it could possibly be associated with dietary, rather than diffusive, acquisition of iron.
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[[Image:SufT.png|left]]
[[Image:SufT.png|left]]
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[[Image:Phenyl.png|left]][[Image:DUF59s.gif|435px|thumb|left|Click to enlarge]]
[[Image:Phenyl.png|left]][[Image:DUF59s.gif|430px|thumb|left|Click to enlarge]]
Another important clue to FAM98B/SufT function may come from additional insights into the steps of the [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2922514/ phenylacetic acid degradation pathway] (for example in easy-to-study E. coli). The DUF59 domain of the PaaJ gene product is reported to comprise part of a beta-ketothiolase -- consistent with some aspect of sulfur mobilization, not yet known in any detail.
Another important clue to FAM98B/SufT function may come from additional insights into the steps of the phenylacetic acid degradation pathway] -- an esoteric topic but [http://www.ncbi.nlm.nih.gov/pubmed/22398448,21296885,20660314,12846838,9748275,17259607,9600981,19208251 exceedingly well-studied].  


The DUF59 domain appears in multiple contexts in bacteria -- SufT, PaaJ, PaaD, YITW, MIP18 and rhamnose reductase-related. Some of this is attributable to poor quality computer annotation and nomenclatural confusion across species, but DUF59 does reside in at least two unrelated operons, the iron sulfur cluster system Suf and the phenylacetic acid catabolism pathway Paa.  
An epic annotation error has propagated to thousands of GenBank and UniProt entries: the DUF59 domain of the phenylacetate catabolic pathway lies in PaaD, not PaaJ (which has only thiolase domains). Some entries state -- nonsensically -- that the PaaD protein is the product of the PaaJ gene; overall 85% of PaaD homologs are incorrectly named PaaJ (with the E.coli [http://www.uniprot.org/uniprot/P76080 accession P76080 for ydbQ] as correct starting point for PaaD):


The question here is whether all DUF59 homologs assist in iron sulfur complex assembly, either specialized to a one apoenzyme or as part of a general system maturating numerous unrelated apoenzymes (like eukaryotic FAM96B). Alternatively -- consistent with poor percentage identity -- the DUF59 domain duplicated and diverged into dimly related functions with little in common apart from a shared fold. However this would allow multiple DUF59 domains within a single prokaryotic genome, so far not observed.
>PaaD_escCol Escherichia coli <font color=red>8 conserved cysteines</font> P76080 PaaJ ydbQ DUF59 unacceptable synonym: PaaJ
MQRLATIAPPQVHEIWALLSQIPDPEIPVLTITDLGMVRNVTQMGEGWVIGFTPTYSG<font color=red>C</font>PATEHLIGAIREAMTTNGFTPVQV
  VLQLDPAWTTDWMTPDARERLREYGISPPAGHS<font color=red>C</font>HAHLPPEVR<font color=red>C</font>PR<font color=red>C</font>ASVHTTLISEFGSTA<font color=red>C</font>KALYR<font color=red>C</font>DS<font color=red>C</font>REPFDYFK<font color=red>C</font>I*


The first alternative implies that each enzyme closely associated to a DUF59 contains a 4Fe-4S cluster. Those have proven notoriously difficult to detect in the case of DNA helicases, polymerases and primases. The problem arises from loss during aerobic protein purification (perhaps with replacement by Zn) and lack of reliable bioinformatic signature for iron-sulfur clusters, notably an 'insufficient' number of conserved liganding cysteines (due to composite dimeric sites or glutathione contributing unsuspected cysteines), a lack of consistent pattern spacing in the cysteines, and ambiguity with dedicated zinc binding sites.
The initial aromatic ring oxygenation (using O2) utilizes a multisubunit complex requiring PaaA, PaaB, PaaC, and PaaE for in vitro reconstitution of catalytic activity. PaaD has no place in the complex but an [http://www.ncbi.nlm.nih.gov/pubmed/16997993 essential role in vivo] as established by mutation and supported by position within the Paa operon in many species.
 
Together, this suggests the DUF59 domain of PaaD establishes and/or repairs the [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3060524/?tool=pubmed 2Fe-2S cluster of PaaE reductase] (which might be especially vulnerable to reactive oxygen species in the oligomer). Such a role for PaaD would not be a great departure from what its homolog does in eukaryotes. Note PaaA itself has a di-iron center though its regulatory paralog PaaC does not. 
 
The DUF59 domain appears in multiple contexts in bacteria -- SufT, PaaD, YITW, MIP18 and rhamnose reductase-related protein. Some of this is attributable to poor quality computer annotation and nomenclatural confusion across species, but DUF59 does reside in at least two distinct operons, the iron sulfur cluster system Suf and the phenylacetic acid catabolism pathway Paa, the difference being that the DUF59 acts on a broader class of iron-sulfur apoproteins in bacterial species with a SufT-containing operon.
 
The question here is whether all remaining DUF59 homologs assist in iron sulfur complex assembly, either specialized to a one apoenzyme or as part of a general system maturating numerous unrelated apoenzymes (like eukaryotic FAM96B). Alternatively -- consistent with poor percentage identity -- the DUF59 domain duplicated and diverged into dimly related functions with little in common apart from a shared fold. However this would allow multiple DUF59 domains within a single prokaryotic genome, so far not observed.
 
The first alternative implies that each enzyme closely associated to a DUF59 contains a Fe-S cluster. However these have proven notoriously difficult to detect in the case of DNA helicases, polymerases and primases. The problem arises from loss during aerobic protein purification (perhaps with replacement by Zn) and lack of reliable bioinformatic signature for iron-sulfur clusters, notably an 'insufficient' number of conserved liganding cysteines (due to composite dimeric sites or glutathione contributing unsuspected cysteines), a lack of consistent pattern spacing in the cysteines, and ambiguity relative dedicated zinc binding sites.
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  Alignment of FAM96A and FAM96B in phylogenetic order:
  Alignment of FAM96A and FAM96B in phylogenetic order:
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  FAM96B_tryCru  DPIDSLEVFHHIRSIRDPEHPNTLEELKVVEPELIRV---DEVKQTVRVQFTPTVPH<font color = red>C</font>SMTTLIGL<font color = red>C</font>ISLKLQRSLPRGTKVDVYVTPGSHEQEEQVNKQLNDKERVAAALENKNLLNVVES<font color = red>C</font>LNEFE
  FAM96B_tryCru  DPIDSLEVFHHIRSIRDPEHPNTLEELKVVEPELIRV---DEVKQTVRVQFTPTVPH<font color = red>C</font>SMTTLIGL<font color = red>C</font>ISLKLQRSLPRGTKVDVYVTPGSHEQEEQVNKQLNDKERVAAALENKNLLNVVES<font color = red>C</font>LNEFE
  FAM96B_leiInf  DPIDAWEVFEIIRRIRDPEHPNSLEQLKVVEPSLITV---DWKKRHIRVLFTPTVPH<font color = red>C</font>SLTTLIGLSIRLQLERSLPEYTKVDIYVTPGTHEQEAQVNKQLNDKERVAAALEN<font color = red>C</font>NLLNVVES<font color = red>C</font>INEFD
  FAM96B_leiInf  DPIDAWEVFEIIRRIRDPEHPNSLEQLKVVEPSLITV---DWKKRHIRVLFTPTVPH<font color = red>C</font>SLTTLIGLSIRLQLERSLPEYTKVDIYVTPGTHEQEAQVNKQLNDKERVAAALEN<font color = red>C</font>NLLNVVES<font color = red>C</font>INEFD
Alignment of assorted bacterial DUF59 genes
100              -LSDDVISALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIVMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVSMTFDPPWSADRMSEEAQVAIGWY
101              -LSDDVIGALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIMMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVEMTFDPPWTPDRMSEEAQVAVGWY
102              -LSDDLIGALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIMMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVEMTFDPPWTPDRMSEEAQVAVGWY
103              -LSDDVIGALKTVYDPEIPADIFELGLIYKIDIEDN-RMVKIMMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVEMTFDPPWTPDRMSEEAQVAVGWY
104              -LSDDVISALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIMMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVEMTFDPPWTPDRMSEEAQVAIGWY
105              -LSDDVISALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIMMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVAMTFDPPWTPDRMSEEAQVAVGWY
115              -LSDDVIAALKTVYDPEIPADIFELGLVYKIDIEDD-RMVKIVMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVSMTFDPPWTPDRMSEEAQVAVGWY
116              -LSDDVIAALKTVYDPEIPADIFELGLVYKIDIEDD-RMVKIVMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVTVEMTFDPPWTPDRMSEEAQVAVGWY
112              -LSDDIISALKTVYDPEIPADIFELGLIYKVDIEDD-RMVKIMMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGSVEGVSGVQVEMTFDPPWTPDRMSEEAQVSIGWY
113              -LSDDVISALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIVMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVDVSMTFDPPWTPERMSEEAQVAVGWY
114              -LSDDVISALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIVMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVDVSMTFDPPWTPERMSEEAQVAVGWY
106              -LSDDIIAALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGISGVEVTMTFDPPWTPDRMSEEAQVALGWY
108              -LSDDIIAALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVTMTFDPPWTPDRMSEEAQVALGWY
107              -LSDDVIAALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVTMTFDPPWTPDRMSEEAQVALGWY
109              -LSDDIIAALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGTVEGISGVEVSMTFDPPWTPDRMSEEAQVALGWY
110              -LSDDIIAALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGTVEGVSGVEVSMTFDPPWTPDRMSEEAQVALGWY
111              -LSDDIIAALKTVYDPEIPADIFELGLIYKIDIEDD-RMVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGTVEGVSGVEVSMTFDPPWTPDRMSEEAQVALGWY
132              -LSDDIISALKTVYDPEIPADIYELGLIYKIDIEDD-RMVKVLMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVATVEGISGVEVDMTFDPPWTPDRMSEEAQVAVGWY
126              -LTDDIVSALKTVYDPEIPADIYELGLVYKIDIEDD-RSVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVQNAVSAVEGVSDVEVNMTFDPPWTPDRMSEEAQVAVGWY
127              -LTDDIVSALKTVYDPEIPADIYELGLIYKIDIEDD-RSVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVNMTFDPPWSPDRMSEEAQVAVGWY
128              -LTDDIVSALKTVYDPEIPADIYELGLVYKIDIEDD-RSVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVNMTFDPPWSPDRMSEEAQVAVGWY
129              -LTDDIVSALKTVYDPEIPADIYELGLVYKIDIEDD-RSVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVNMTFDPPWSPDRMSEEAQVAVGWY
131              -LTDDIVSALKTVYDPEIPADIYELGLVYKIDVEDD-RSVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVNMTFDPPWTPDRMSEEAQVAVGWY
130              -LTDDIVSALKTVYDPEIPADIYELGLIYKIDIEDN-RSVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSGVEVNMTFDPPWSADRMSEEAQVAVGWY
117              -MTDDIIAALKTVYDPEIPADIYELGLIYKIDIEDD-RTVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVSFVEATMTFDPPWTPDRMSEEAQVAVGWY
118              -MTDDIIAALKTVYDPEIPADIYELGLIYKIDIEDD-RTVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVSFVEVTMTFDPPWTPDRMSEEAQVAVGWY
119              -MTDDIIAALKTVYDPEIPADIYELGLIYKIDIEDD-RTVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVSFVEVTMTFDPPWTPDRMSEEAQVAVGWY
121              -MTDDIIAALKTVYDPEIPADIYELGLIYKIDIEDD-RTVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVSFVEVTMTFDPPWTPDRMSEEAQVAVGWY
122              -MTDDIIAALKTVYDPEIPADIYELGLIYKIDIEDD-RTVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVSFVEVTMTFDPPWTPDRMSEEAQVAVGWY
120              -MTDDIIAALKTVYDPEIPADIYELGLIYKIDIEDD-RTVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVSFVGVTMTFDPPWTPDRMSEEAQVAVGWY
123              -MTDDIIAALKTVYDPEIPADIYELGLVYKIDIEDD-RTVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVSMVEVTMTFDPPWTPDRMSEEAQVAVGWY
125              -MTDDIIAALKTVYDPEIPADIYELGLVYKIDIEDD-RTVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVGAVEGVSMVEVTMTFDPPWTADRMSEEAQVAVGWY
133              -MTNDIIAALKTVYDPEIPADIYELGLIYRIDIEDD-RSVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVSYVEVTMTFDPPWTPD<font color = red>C</font>MSEEAQIAVGWY
134              -MTNDIIAALKTVYDPEIPADIYELGLIYRIDIEDD-RSVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVSHVEVTMTFDPPWTPE<font color = red>C</font>MSEEAQIAVGWY
135              -MTNDIIAALKTVYDPEIPADIYELGLIYRIDIEDD-RSVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVLSVEVTMTFDPPWTPD<font color = red>C</font>MSEEAQVAVGWY
137              -LTSDIIAALKTVYDPEIPADIYELGLIYRIDIEDD-RSVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVLSVEVTMTFDPPWTPE<font color = red>C</font>MSEEAQIAVGWY
136              -LTNDIIAALKTVYDPEIPADIYELGLIYRIDIEDD-RSVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVLSVEVIMTFDPPWTPE<font color = red>C</font>MSEEAQIAVGWY
138              -MTDDIISALKTIYDPEIPANIYDLGLIYRVDIEDD-RSVKIEMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVNAVEGVSYVEVIMTFDPPWTPD<font color = red>C</font>MSEEAQVATGWY
124              -MTDDIIGALKTVYDPEIPADIYELGLIYKIDIEDD-RSVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVEGVGNVEVSMVFDPPWTPDRMSEEAQVALGWY
144              -LTDDIVSALKTVYDPEIPADIYELGLIYKVDIEDD-RSVKIDMTLTAPG<font color = red>C</font>PVAGEMPGWVQNAVSSVEGVGDVEVTMVFDPPWTPDRMSEEAQFAVGWY
139              -LTTDIIGALKTVYDPEIP<font color = red>C</font>DIYELGLIYKVDIEDD-RSINIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVAGVGPVNVDMVFDPPWTPDRMSDEAKVALNWY
140              -LTSDIIGALKSVYDPEIP<font color = red>C</font>DIYELGLIYKVDIEDD-RSINIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVAGVGPVNVDMVFDPPWTPDRMSDEAKVALNWY
141              -LTADIIAALKTVYDPEIP<font color = red>C</font>DIYELGLIYKVDIEDD-RSVKVDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAIAAVPGVGAVDVSMVFDPPWTPDRMSEEARVALNWY
145              -LTDDIVGALKTVYDPEIPADIYELGLIYKIDIDDE-RNVDVEMTLTAPG<font color = red>C</font>PVAGEMPIWVENAVSSVDGVGQVRVDLVFDPPWTPERMSEEAQVAVGWF
143              -ITADLIAALKTVYDPEIPVDIYELGLIYKVDLDDD-RNLTIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAARSVEGIQDVEVKMVFDPPWGPDRMSEEAQVALNWW
142              -LTGDIIAAMKTVFDPEIPVDIYELGLIYKVDIEDD-RTVKIDMTLTAPG<font color = red>C</font>PVAGEMPIWVENAVSSVPGVGAVQVDMTFDPPWDPSRMSDEARVALNFF
146              -LTNDIIAALKTVYDPEIPADIYELGLIYKVEIDDD-RNVVIDMTLTAPG<font color = red>C</font>PVAGEMPIWVENAVSAVAGIAQTKVNIVFDPPWDQSRMSDEARLAVGMF
147              -LTDEIVTALKSVYDPEIPADIYELGLIYRVQIEDD-RRVLIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVPGVQS<font color = red>C</font>QVTMVFDPPWDQSRMSDEARIALDMW
148              -LTDDIVAALKTVYDPEIPADIYELGLIYKVDIGDD-RNVAIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVPGVQS<font color = red>C</font>AVTMVFDPPWDQSRMSDEARVALDMW
150              -LTDGIVAALKTVYDPEIPADIYELGLIYKVDIADD-RQVSIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVSAVPGVQG<font color = red>C</font>TVTMVFDPPWDQSRMSDEARVALDMW
151              -LTDGIVAALKTVYDPEIPADIYELGLIYKVDISDD-RHVAIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVAAVPGVQG<font color = red>C</font>TVTMVFDPPWDQSRMSDEARVALDMW
149              -MTDDIIAALKTVYDPEIPSDIYELGLIYRVDIDDD-RNVVIDMTLTAPG<font color = red>C</font>PVAGEMPGWVENAVAAVQGVQSVKVNMVFDPPWDQSRMSDEARVALDMW
152              -LTDELITAFKSVFDPEIPVDIYELGLIYRVDVSDD-RHVVVDMTLTAPG<font color = red>C</font>PVAGEMPGWVEQAITGVKGVASAEVNLVFEPPWDSSRMSDEAKLQLNMF
153              -LTDDLIEALKTVYDPEIPVDIYELGLIYKVDVSDD-RDVLVEMTLTAPG<font color = red>C</font>PVAGEMPGWVETAVAKVEGVRSAKANLVFDPPWDSSKMSDEAKLALNMF
154              -LTDQLIEKLKTVYDPEIPVDIYELGLIYKVDVSDS-KDVAIDMTLTAPG<font color = red>C</font>PVAGEMPGWVKDAVMEIPGLKS<font color = red>C</font>TVELTFDPPWDASRMSDEAKLQLNMF
155              -LTDQLIEKLKTVFDPEIPVDIYELGLIYKVDISDD-KDVAIDMTLTAPG<font color = red>C</font>PVAGEMPGWVRDAVMELEGIKS<font color = red>C</font>HVDLVFEPPWDPSRMSDEAKLQLNMF
156              -LTDQLIEKLKTVYDPEIPVDIYELGLIYKVDVSDD-KDVAIDMTLTAPG<font color = red>C</font>PVAGEMPGWVEDAVMEIDDIKS<font color = red>C</font>KVELVFDPPWDPSRMSDEAKLQLNMF
157              -LYDQIVEA<font color = red>C</font>RTVYDPEIPVNIYELGLIYTIDINDQ-SEVNIKMSLTAPG<font color = red>C</font>PVAGEMPGWVADAVEPLPGVKTVDVELVWEPPWGMDMMSDEARLELGFM
158              -LYEQITEA<font color = red>C</font>RTVYDPEIPVNIYELGLIYTIDINAE-NEVNIKMSLTAPG<font color = red>C</font>PVAGEMPGWVADAVEPLPGVKTVDVELVWEPPWGMDMMSDEARLELGFM
159              ----AIIEALKSVYDPEIPVNIYDLGLIYEIRIFED-RTVYVKMTLTAPG<font color = red>C</font>PVAGTLPGQVEMRLQEVPGVKDARVELTFDPPYTIERMSDEARLALGWM
160              -LREPIIASLRGVHDPEIPVNIYDLGLIYRIDIAGN-GDVSVDMTLTAPG<font color = red>C</font>PVAGMMPLMVKSAVERVEGVGQVSVQLVWDPPWSADNMSDEARLQLGLM
161              -LREPIIAALRRVHDPEIPVNIYDLGLIYKIDIASN-GNVDVDMTLTAAA<font color = red>C</font>PVAGMMPLMVKDAVQKVEGVGQVEVELVWDPPWSQDNMSEEALLQLGMM
162              -LQEAVIAALKEIYDPEIPVNIYDLGLIYGVEVSED-KDVVVTMTLTTPH<font color = red>C</font>PVAESMPAEVEIRAGSVPGVRDAEVNLVWDPPWGPDKMTDEARLELGML
163              -LYDAIIDALKEIYDPEIPVNIYDLGLVYGVDVTED-GHAVVTMTLTTPH<font color = red>C</font>PVAESMPGEVELRVGAVPGVGDAQVNLVWDPPWDPQKMSDEAKLELGML
164              -TYDAVIEALKEIYDPEIPVNIYDLGLIYGVEVSEG-SHVAVTMTLTTPH<font color = red>C</font>PVAESMPGEVELRVGSVPGVGTVDVNLVWDPPWDPQKMSDEAKLELGML
165              -LKAEIIETLRDIYDPEIPVNIYDLGLVYDIEIGDD-NHVVIKMTLTTPN<font color = red>C</font>PVAGSMPAEIELRVGQIKGVGAVEVELVWDPPWGMDRISDEAKLELGLL
166              -LKAEIIETLRDIYDPEIPVNIYDLGLVYDIEIGDD-NHVVIKMTLTTPN<font color = red>C</font>PVAGSMPAEIELRVGQIKGVGAVEVELVWDPPWGMDRISDEAKLELGLL
167              -LKAEIIETLRDIYDPEIPVNIYDLGLIYDIEIGDD-NHVVIKMTLTTPN<font color = red>C</font>PVAGSMPAEIELRVGQIKGVGAVEVELVWDPPWGMDRISDEAKLELGLL
168              -LKEAIVNALREIYDPEIPVNIYDLGLIYDISIDDE-SHVTIQMTLTTPG<font color = red>C</font>PVAQTFPGTVEQAVNKVEGV<font color = red>C</font>D<font color = red>C</font>TVELVWEPPWSQERMTEAARLELGMF
169              -LKEAIINALRGVYDPEIPVNIYDLGLIYDVSIDDN-AHVLIQMTLTTPG<font color = red>C</font>PVAQTFPGTVEQAVNQVEGVSD<font color = red>C</font>TVELVWEPPWSQERMTEAARLELGIF
170              -MKEAIITALKGVYDPEIPVNIYDLGLIYDVSIDDD-AHVAVQMTLTTPG<font color = red>C</font>PVAQTFPGTVEQAVNQVEGVRD<font color = red>C</font>TVELVWEPPWTQERMTEAARLELGIF
171              -IKEGVITALKGVFDPEIPVNIYDLGLIYDIAVNDE-GHVHIQMTLTTPG<font color = red>C</font>PVAQTFPGTVEQAVNQVEGVSD<font color = red>C</font>TVELVWEPPWSQDRMTEAARLELGIF
172              -IKEGVITALRGVFDPEIPVNIYDLGLIYDIAVNDE-GHVHIQMTLTTPG<font color = red>C</font>PVAQTFPGTVEQAVNQVEGVSD<font color = red>C</font>TVELVWEPPWSQDRMTEAARLELGIF
173              -IKEGVITALRGVFDPEIPVNIYDLGLIYDIAVNDE-GHVHIQMTLTTPG<font color = red>C</font>PVAQTFPGTVEQAVNQVEGVSD<font color = red>C</font>TVELVWEPPWSQDRMTEAARLELGIF
174              -IKEGVITALRGVFDPEIPVNIYDLGLIYDIAVNDE-GHVHIQMTLTTPG<font color = red>C</font>PVAQTFPGTVEQAVNQVEGVSD<font color = red>C</font>TVELVWEPPWSQDRMTEAARLELGIF
175              -LKEDVIDVLKTIYDPEIPINIYELGLIYDIQISTS-GNVNIDMTLTAPG<font color = red>C</font>PVAQSFPGDVESRVMSVPGVKKAHVELVWEPQWTKDMMTEAAQLQLGMF
176              -LKEEVIEVLKTIYDPEIPINIYELGLIYKVDVSNS-GNVSIDMTLTAPG<font color = red>C</font>PVAQSFPGDVESRVMSVEGVKKAHVELVWDPQWTKDMMSEAAQLQLGMF
177              -LKEDVIEMLKTIYDPEIPVNIYELGLIYQIDVSDS-GNVVIQMTLTAPG<font color = red>C</font>PVAQTFPGDVENKIRSIDGVNKVHVELVWDPPWTRDQMSEAAQLQLGMF
178              -VRENVIEMLKTIYDPEIPVNIYELGLIYNIDVSDS-GNVVIRMTLTAPG<font color = red>C</font>PVAQSFPGDIESKVETVDGVNKVHVELVWDPPWSKELMSESARLQLGMF
181              -VKDQIFAALKKVYDPEMPVNIVELGLIYGIEVDDA-GQVDVRMTLTAPN<font color = red>C</font>PVAGSLPAEAERAIRSVPGVTGVKLELTFDPPWTKARMSEAAKLA<font color = red>C</font>GIE
179              -LEEKIIQALKT<font color = red>C</font>YDPEIPVDIFELGLIYEVAIDDN-NNVKIKMTLTSPM<font color = red>C</font>PAAQSLPLEVEGKVKSIPQVNDVKVEVVWNPPWNKDMMSEVAKLELGFL
180              -LKEKVVEALKTVYDPEIPIDIYELGLIYEIKVFPV-NNVYILMTLTTPN<font color = red>C</font>PSVEELPAEVKNKVLAIEGVNDVELDMTFEPPYHQDMMSEAAKLELGFL
182              ISEQQVWDALETIFDPEIPINLVSLGLIYKVEIDQGTGSVNIDMTLTAPG<font color = red>C</font>GMGPVLVGDVEYRVAMVPHVKNVNVELVFDPAWSRDMMSEEAQLEAGLF
183              ISEQQVWDALETIFDPEIPINLVSLGLIYKVEIDQGSGDVNIDMTLTAPG<font color = red>C</font>GMGPVLVGDVEYRVAMVPHVKNVNVELVFDPAWSRDMMSEEAQLEAGLF
185              VSEDQVWEALETIYDPEIPINLVSLGLIYKVAVDKDSGTVTIDMTLTAPG<font color = red>C</font>GMGPVLVGDVEYRVSLVPHVKNVNVELVFDPPWSRDMMSEEAQLEAGVF
184              ISESQVWEALETIFDPEIPINLVSLGLIYAVNIDQDAQRIDIDMTLTAPG<font color = red>C</font>GMGPVLVGDVEYRLSLVPHVKDVQVNLVFDPPWSRDMMSEEAQLEAGVF
186              ISEAQLWEALHTVFDPEIPVDLVNLGLIYRVEIDQDAQRVDVAMTLTAPG<font color = red>C</font>GMGPVLVGDVEHRLRMVPFVKEVDVDLVFDPPWNRDMMSEEAQLETGMF
187              ISEEQVWEALHTVFDPEIPVDLVNLGLIYRVEIDQELQSVNVVMTLTAPG<font color = red>C</font>GMGPVLVGDVEYRLRMVPFVKNVSVELVFDPPWSRDMMSEEAQLETGMF
192              ISEQQVWEALHTVFDPEVPVDLVNLGLVYSMEIDQGSGTVSIVMTLTAPG<font color = red>C</font>GMGPVLVGDVEYRLAQVPHVKKVMVDLVFDPPWSRDMMSEEAKLETGMF
188              INEEQVWEALESVYDPEIPVNLRALGLIYQMKADQQRGTVHIEMTLTAPG<font color = red>C</font>GMGPVLVGDVKHRVALVPNVKKVEVELVFDPPWHRDMMSEEAQLETGMF
193              IDQAQIYQALETVYDPEIPVNLLSLGLIYQVSIDQAAR<font color = red>C</font>VQIEMTLTAPG<font color = red>C</font>GMGPVLVGDVEHRVSMVPHVDKVQVNLVFDPPWSREMMSEEAQLETGLF
189              IREDDVWYALKTVFDPEIPVNLVDLGLIYNVDIDQANKQVKIDMTLTAPG<font color = red>C</font>GMGPVLVGDVEYRVKLVPNVENVEVELVFDPPWHRDMMSEEAQLETGMF
190              IKEEQVWQALGTVFDPEIPVDLVNLGLIYGVDIDQVNSRVSIRMTLTAPA<font color = red>C</font>GMGPVLVGDVEYRVRKVPNVKRVDVELVFDPPWQRHMMSEEAQLQTGMF
191              ILEEQVWQALGSVFDPEIPVDLVNLGLIYGVKIDQQAKQVDIQMTLTAPA<font color = red>C</font>GMGPVLVGDVEYRVRLVPNVKSVKVELVFDPPWQRHMMSEEAQLQTGMF
199              TVKHNVWQLLKTVYDPEIPVNIVDLGLVYHVRVTTGANQVEIVMTLTAPG<font color = red>C</font>GMGPIIQQDVERLVKSLPGVGQVKVEVVFDPPWSRDMMSEAAKLQLGML
194              VNENQVWEAMRN<font color = red>C</font>YDPEIPVNVVELGLIYE<font color = red>C</font>EIQEDGNHVYVKMTLTAAG<font color = red>C</font>GMGPVITEDVKTKLEHVPNVDKVTVELTFDPPWNNDMLTDEAKLELGML
195              INENQVWEALRN<font color = red>C</font>YDPEIPVDVVNLGLIYE<font color = red>C</font>RIEEDGNHVYIKMTLTAAG<font color = red>C</font>GMGPVITDDVKRKVEHVPNVDKVTVELTFDPPWNNDMLTDEAKLELGML
196              INENQVWEALRN<font color = red>C</font>YDPEIPVDVVNLGLIYE<font color = red>C</font>RIEEDGNHVYIKMTLTAAG<font color = red>C</font>GMGPVITDDVKRKVEHAPNVDKVTVELTFDPPWNNDMLTDEAKLELGML
198              -NEEQVWEQLRTVYDPEIPVNIVELGLVYA<font color = red>C</font>KAEEGGQRVDIQMTLTAPG<font color = red>C</font>GMGPVLVEDVRTKVGSVPGVAETRVELVWDPPWGQERMSDVARLQLGWM
197              QLEAFIWEQLRT<font color = red>C</font>FDPEIPVNIVDLGLVYG<font color = red>C</font>RIENGETMVTIRMTLTAPG<font color = red>C</font>GMGEVIAEDARRKIMGAAQVSKTHIEIVFDPPWSREMMTEEAKLELGMF


=== NARFL (IOP1) ===
=== NARFL (IOP1) ===

Revision as of 03:46, 24 June 2012

Introduction

The surprisingly numerous nuclear proteins containing 4Fe-4S clusters are made from their respective apoproteins in the cytoplasm during the final stages of an assembly process that begins within mitochondria and ends with an embedded cluster in polymerases, helicases, primases, telomerases, and photolyases with no explained need for a cofactor otherwise associated with oxidation and reduction.

These 4Fe-4S clusters do not spontaneously associate with their target protein because they do not occur in free solution, being quite unstable to unwanted oxidation. Instead, nascent clusters are attached to a series of mediating proteins, carrier scaffolds and conformational chaperones throughout a complex process of maturation. That process and the gene products involved -- which are conserved from yeast to human -- have been recently reviewed in depth and new results (1,2) have clarified the roles of the four main protein components that collaborate on the final stage of cytoplasmic assembly.

Not all extra-mitochondrial 4Fe-4S cluster proteins are assembled in this pathway, but the molecular basis for specificity has not yet been determined. Indeed, a surprising number of proteins -- some studied for decades -- have only been recognized as iron sulfur proteins in 2011-12.

Indeed, the list of proteins is still incomplete because many unrelated homology classes have Fe-S clusters, meaning no single diagnostic pattern can be used to scan the entire proteome. Often four conserved cysteines coordinate the cubane complex but their spacing within the primary sequence is not uniform and difficult to distinguish from cysteine patterns that bind intrinsic zinc. Further confusing matters, seemingly artifactual zinc can replace bona fide 4Fe-4S clusters in proteins purified for crystallography in the presence of oxygen (1,2,3).

The early and middle stages of intra-mitochondrial iron sulfur cluster assembly are carried out by gene products of bacterial origin, relics of alphaproteobacterial endosymbiosis transferred long ago to the nuclear genome. However, not all components of final cytoplasmic assembly have such a clear origin whereas most targeted apoproteins (such as primase large subunit PRIM2) are clearly those of the archaeal parent. Thus the final stage of assembly presents two worlds in collision: bacterial proteins assembly iron sulfur clusters in unfamiliar archaeal proteins.

Bioinformatics, while a poor substitute for experimentation, is fast and easy, so it is best to exhaust the possibilities there first. Nothing is proven but sometimes it can suggest interesting directions.

MMS19: a large all-scaffold protein

MMS19 is a large protein involved in cytoplasmic iron sulfur assembly first studied with bioinformatic tools 12 years ago (1,2). Revisiting that with modern comparative genomics methods, MMS19 emerges as a modular scaffolding protein over its entire length, conserved in its features -- though not particularly in amino acid sequence -- from the earliest diverging eukaryotes to human.

The C-terminus of MMS19 was initially classified as HEAT repeats. Today we know these are not found as individual units but instead work together to form a long twisted spiral of consecutive modules called an ARM domain. An individual HEAT unit consists of a small 3-helix bundle, a generic super-secondary structure analogous to a beta-alpha-beta Rossmann fold unit, meaning most occurrences of HEAT in the eukaryotic proteome are not truly homologous despite structural similarity but instead represent convergent evolution analogous to Rossmann-like fold units forming many unrelated beta propellers or TIM barrels.

Since these domains are catalytically inert and lack conserved cysteins or other conserved motifs, MMS19 can contribute as organizing principle to the cytoplasmic iron assembly complex (and other nuclear complexes) but not to the actual business of forming 4Fe-4S on target apoproteins.

The size of MMS19 -- over a thousand residues -- makes it a difficult target for structure determination. As of June 2012, no deposited structure at PDB provides a template upon which the MMS19 can be threaded. In the interim, MMS19 might be structurally modeled using the known beta-catenin structure -- despite its lack of authentic homology, it too is comprised almost entirely of HEAT units.

The number of HEAT repeats in an ARM domain is subject to expansion and contraction over evolutionary time. The individual units often align poorly with each other and generally lack conserved residue signatures despite initial reports, yet this level of variation does not necessarily affect the overall fold. However, this lack of diagnostic features makes it difficult to reliably identify remote homologs of HEAT repeats because the primary sequences can be diverged beyond recognition and homological alignments go out of register when the number of repeats differs.

An accurate count of the number of individual HEAT domains in MMS19 from a given species is also difficult because some domains are more accurately represented in the HMMer profile than others, here giving different counts between mouse and human at UniProt despite 90% sequence identity over their entire length. Indeed the five species with manually reviewed UniProt entries are all in conflict, with the nominal number of HEAT units range from 7 in human to 18 in slime mold, despite similar lengths and overall alignment implying the same actual domain structure.

MMS19 is a single-copy gene without paralogs in all eukaryotes, implying simple orthology (no retained duplications or losses). Below, 20 full length fasta sequences from GenBank were chosen for uniform distribution over the eukaryotic phylogenetic tree. Superfamily proved to be the most consistent, sensitive and selective online tool for ARM domain detection. The figure at bottom establishes that MMS19 consists entirely of HEAT units and spacers, which in effect form a single ARM.

It emerges upon alignment with MultAlin that conservation is mediocre overall except for one previously notedspecial region of exceptional conservation containing two blocks of invariant residues from human to yeast to amoeba. This region must have already been established in the last common ancestor of all eukaryotes and play a very special role in MMS19 even today to account its conservation over trillions of years of cumulative branch length. However that role remains a complete mystery. Sequence conservation in MMS19 is otherwise not exceptional: typically 27-34% identity relative to human, of which some portion is accidental.

Ultra-conserved region in MMS19:

human: 182 DGEKDPRNLLVAFRIVHDLISRDYSLGPFVEELFEVTSCYFPIDFTPPPNDPHGIQREDL 241
yeast: 184 NGEKDPRNLLLSFALNKSITSSLQNVENFKEDLFDVLFCYFPITFKPPKHDPYKISNQDL 24 

Regardless of Blast query -- full-length MMS19, this ultra-conserved region, or reconstructed ancestral sequence -- no counterpart to MMS19 occurs among 2,500 complete bacteria and archaea genomes, even though unambiguous orthologs to human MMS19 are readily found in the earliest diverging eukaryotes. MMS19 may thus represent a eukaryotic innovation needed to organize more complex cytoplasmic iron assembly, or be too simplified and diverged (or just lost) in prokaryotes. As method of last resort, prokaryotic operons containing other cytoplasmic iron sulfur assembly proteins could be scanned for adjacent HEAT-like domains or comparable scaffolding proteins.

click to enlarge

There are no matches to MMS19 at PDB using Blastp. Since the fold is widespread and generic, structural matches in DALI do not imply homology. On the other hand, this allows the crystallographic structure of a non-homologous ARM protein (beta-catennin pdb: 1LUJ) to serve as provisional structural template. Bound E-cadherin, ICAT, XTCF3 complexes have been also been determined which may suggest a binding mode for cytoplasmic iron sulfur and helicase-type proteins on HEAT repeats of MMS19.

MMS19 could determine selectivity among the overall set of iron sulfur apoproteins if only those interacting with DNA (or comparable nucleotide) have binding propensity for HEAT units. This specificity would then vary by organism, as would the effects of knock-in replacement. Only those apoproteins that align along the linear scaffolding structure in close enough proximity to CIA effector proteins receive an iron sulfur complex. Not every protein arising in this context need directly bind a HEAT domain -- they could bind another protein with that capacity.

This scaffolding scenario requires multiple non-homologous proteins to have HEAT binding sites, which seemingly requires convergent evolution on a significant scale since a shared mobile binding domain can be ruled out. If MMM19 is truly a eukaryotic innovation, then cytoplasmic iron assembly complex initially functioned without the scaffolding until MMS19 and these binding sites evolved.

That seems implausible, so some other common ground must account for HEAT binding. One option, based on the super-helical configuration and major groove of the overall ARM domain, supposes that that MMM19 spoofs a DNA helix or nucleotide base in shape and charge (along the lines of W536 in CRY1B photolyase). This would explain most of the specificity -- each archaeal apoproteins of DNA metabolism needing an iron sulfur cluster already has a DNA binding site, so already an appropriate MMM19 HEAT binding site.

In early endosymbiosis, retained bacterial cluster assembly machinery collides with nuclear-encoded archaeal iron-sulfur protein motifs previously maturated by a different system, a conflict that had to be seamlessly resolved without ever a gap in continued functionality.

CIAO1: a WD40 multi-protein scaffold

The bioinformatic analysis of CIAO1 is straightforward: it consists of a WD40 domain in its entirety. There is no CIAO2 -- this is a single-copy gene in all eukaryotes. These ubiquitous 7-propeller blade domains can arise in non-homologous proteins as a common supersecondary structure rather than from spread of a mobile domain -- the human genome encodes some 257 proteins with a WD40 repeat. However a degree of coincidental sequence alignment can arise from common constraints (such as a conserved glycine/histidine and the tryptophan/aspartate pairs).

WD40 domains are not catalytic and so, like MMS19, not involved here mechanistically in Fe-S formation, transfer or repair. Thus CIAO1 is likely a structural scaffolding protein coordinating larger multi-protein complexes, so its acronym (Chinese for bridge) is appropriate. Crystallographic structures have been determined both in yeast PDB: 2HES and human PDB: 3FM0.

click to enlarge

Strongly conserved surface residues -- which likely mediate oligomeric interactions -- mostly lie on the top and one side of CIAO1. Despite this, of four substitutions tested, only R127E (purple) affected in vivo functionality, as assayed bu plasmid rescue of CIAO1 depleted cells and levels of the assembled Fe-S protein isopropylmalate isomerase. This does not explain observed conservation of other surface residues such as K16, R34, E54, E197 and R251 which are unlikely to play a role in internal structure or stability.

No journal article ever accompanied the human structural determination but differences from yeast are likely minor in view of demonstrated replacement capability. Since human CIAO1 forms a hetero-oligomer with FAM96A and likely FAM96B as well, this suggests yeast CIAO1 forms a similar oligomer with its counterpart yeast FAM96B consistent with the late role of CIAO1 in cytosolic FeS assembly.

It is thus feasible to separately determine conserved residues in FAM96A and FAM96B using ConSurf. Their common ground would then include the binding site for CIAO1, presumably either its previously established conserved top or side residues. Since FAM96B forms a domain-swapped dimer and CIAO1 binds stoichiometrically, a symmetric heterotetramer can be expected.

However nothing is accomplished in terms of coordinated docking unless CIAO1 has a second binding site for another component of cytosolic FeS assembly. CFD1 is a possibility here in view of the CFD1-CIAO1 fusion protein in S. pombe, as are NBP35, ERCC2 and ANT2.

click to enlarge

CIAO1 has weak blast matches in both bacteria and archaea but these are not associated with any of the three iron sulfur cluster assembly system operons (ISC, SUF, NIR) and may simply represent convergence in WD40 proteins. Matches to early-diverging eukaryotes -- a half dozen are provided below -- are much more persuasive because back-blastp to human uniquely recovers CIAO1. These exhibit extensive conserved regions considering the immense phylogenetic span and rapid evolution of some clades. Narrowly ineage-specific indels, presumably in loop regions, can be removed to create an idealized alignment that better reflects conserved residues.

FAM98B is homologous to bacterial SufT

FAM96B is remarkably conserved throughout eukaryotes. It duplicated in the earliest metazoa, giving rise to FAM96A after the divergence of choanflagellates but before those of sponge, trichoplax, ctenophore or cnidarian. Both FAM96B and FAM96A were retained in all metazoan lineages. In vertebrates but not earlier diverging deuterostomes, FAM96A acquired an umistakable signal peptide, meaning it was no longer targeted to the cytoplasm. The species with the signal peptide are exactly those with an extra pair of invariant cysteines, suggesting a disulfide suitable for an oxidizing subcellular compartment such as endoplasmic reticulum.

However, these new cysteines are not in proper crystallographic position to form a disulfide, though the new Cys99 and the long conserved near-terminal Cys155 are within range and may form a disulfide under certain conditions. The positions of two Cys90, one from each monomer, may also be in position to form a disulfide, 2Fe-2S, or zinc ligand provided the protein is purified anaerobically or reconstituted using some sort of activity assay. The phylogenetic conservation of cysteines is explored in the alignment below.

The two encoded proteins both bind CIA01. However they must have distinct functions in vivo to account for retention of both proteins in so many lineages for so long. The usual explanations -- specialized time of expression during development or in differentiated populations of cells -- are not applicable to single-celled organisms. Since the signal peptide in FAM96A arose fairly late, it too cannot explain retention in earlier diverging species. (Note however tools that recognize signal peptides are not adequately trained on these species.) Since the duplication is restricted to metazoans (ie animals), it could possibly be associated with dietary, rather than diffusive, acquisition of iron.

The placement and phase of introns in FAM96B and FAM96A -- largely conserved -- implies that FAM96B was largely intronated prior to gene duplication. Although the two genes did go their separate ways to a certain extent during the subsequent 600 million years (both gains and losses of introns occurred), the patterns remain very closely related today even comparing human to sponge. Most remarkably, the first intron was already in place in early diverging stramenopiles (eg Phytophthora infestans) and the last exon already present in amoebozoa (eg Dictyostelium discoideum). Below phase numbers such as 00 and 12 show codon bp overhangs and ^^ indicates absence of an exon break.

FAM96A_homSap       MQRVSGLLSWTLSRVLWLSGLSEPGAARQPRIMEEKALEVY 12 DLIRTIR ^^ DPEKPNTLEELEVVSESCVEVQEINEEEYLVIIRFTPTVPHCSLATLI 12 GLCLRVKLQRCLPFKHK 00 LEIYISEGTHSTEED 12 INKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_sacKow                       MNKDETLRIKGAEDDQEKELAEEIY 12 DIIRTIR ^^ DPEKPQTLEDLDVVYEDGVLVNHRGTDEFLVNVEFTPTVPHCTLATLI 12 GLCIRVKLQRTLPHSYK 00 LDIFIKKGTHSTEDE 12 INKQINDKERIAAAMENPNLKDLVDNCVVDLE
FAM96A_triCas               MPDLLELVEFEDSPRKEVKEVSEDDSELKYTVY 12 DLIRTIK ^^ DPEKPNTLEELNVVYEEGEVKERTSGNVSVVRVEFNPTVPHCSLATLI ^^ GLCIRIKLERCIPYRIK ^^ LDIYIKAGAHTTEHE 12 INKQINDKERIAAAMENPNLREMVENCIVEED
FAM96A_nemVec                 MSNTNDPSFGASRIDNDVNSQSNRNLALDVY 12 DLIKDIK 00 DPEKPQTLEDLKVVYESCVEVQKVAGQDHITIT FTPTVPHCSLATLI 12 GLCIRVKLEKSLPEKFK 00 LDIYLKKGTHSTENE 12 INKQINDKERIAAAMENPNLRKIVENCIDEDNGYD
FAM96A_acrPal                       MSENKILSTAADSSFDNLVLVQEVF 12 DIVKDIR 00 DPELPQTLEELHVIEEEFIKIDKIENDEYIIKIEFTPTVPHCSLATLI 12 GLCLRVKLERSLPYKFK 00 LDIFLSRGTHSTENE 12 INKQINDKERIAAAMENPNLKKIVEECILDAN
FAM96A_triAdh                                                 12 ELIRDIK 00 DPELPQTLEELNVVTEDEIFVRNMKQGEACIRINFTPTVPHCSLATLI 12 GLCIRVKLQRCLDQDYK 00 LDIYVTKGSHDTEDG 12 VNKQINDKERVAAAIENPNVKKLVEECLQEVQY

FAM96B_homSap MVGGGGVGGGLLENANPLIYQRSGERPVTAGEEDEQVPDSIDAREIF 12 DLIRSINDPEHPLTLEELNVVEQVRVQ    00 VSDPESTVAVAFTPTIPHCSMATLI ^^ GLSIKVKLLRSLPQRFK 00 MDVHITPGTHASEHA 12 VNKQLADKERVAAALENTHLLEVVNQCLSARS
FAM96B_braFlo      MSSPDRLQNANPQLYGRTSEREVTPEELNEDVEDAIDAREIF ^^ DILSSINDPEHPLTLEELNVIEQSRIT    00 VDEDNNHVSVEFTPTIPHCSMATLI ^^ GLSIRVKLLRALPTRFK 00 VDVHITPGTHQSEHA 12 VNKQLADKERVAAALENQHLLEVVNQCLSTRN
FAM96B_droMel        MPTEIENINPNVYDRIKERVLTANEEDENVPDPFDKREIF 12 DLIRNINDPEHPLTLEELHVVQEDLIR    ^^ INDSQNSVHISFTPTIPHCSMATLI ^^ GLSIRVKLLRSLPPRFK ^^ VTVEITPGTHASELA ^^ VNKQLADKERVAAALENNHLAEVINQCIAKG
FAM96B_nemVec     MAAVTDRLENVNPTVFQRLKERVVLAEEEDDNIVDKIDDREIF 12 DMIRSINDPEHPLTLEELNVVEQALID    ^^ VSDDESYVKVQFTPTIPHCSMATLI ^^ GLAIRVRLLRSLPDRFK 00 VDVKITPGTHQSEIA 12 VNKQLADKERVAAALENNHLLDVIDQCLVSKK
FAM96B_triAdh   MSKFSSAIGLENINPTVFSKSKEREILPEELDDNIVDKIDEREIF 12 DIIRSINDPEHPLTLEELNVVEECKID    ^^ VDDDNNFVKVHFTPTIPHCSMATLI ^^ GLCIRVRLIRSLPERFK 00 VDITVTPGSHSSEIA 12 VNKQLADKERVAAAMENSNLLKVVNQCLAMD
FAM96B_ampQue         MMAADNANPVVFEVAKQRPVTVEEEKDDVYDEIDAREVF 12 DLIRHINDPEHPLTLEELNVVQEDLIC    ^^ INNKENFVSVHFTPTIPHCSMATLI ^^ GLSIRVCLLRSLPNRFK 00 IDVIITPGSHMSEQA 12 VNKQLADKERIAAAIENSHLLNVVHQCLNTKRKQ
FAM96B_monBre          MALENAAPRVYGKVQERVTLDNDFDDDVIDPFDSREIF 12 DLVRHINDPEHPLTLEELNVVRL    12 DQILVDDAQNYVRVQFTPTIPHCSMASLI ^^ GLCLRVRLLRALPPRFK 00 VDVEIFPGTHATEAS 12 INKQLADKERVAAALENPNLKTVVNECLQLDDKYLD


FAM96A.png

FAM96B and FAM96A are comprised of a single domain of unknown function, DUF59, a fall-out of automated primary sequence clustering. DUF59 is an uncommon domain -- FAM96B/FAM96A are the only human proteins (out of an 18,500 member proteome) to contain it. Thus it is remarkable that the top Blastp matches to prokaryotes are a DUF59 domain in the bacterial SufT gene. SufT is part of a large operon of an alternative system for formation of 4Fe-4S proteins. Further, a SufT-related domain occurs in Q6STH5 of Arabidopsis thaliana (in chloroplasts, cyanobacterial endosympbiont proteins assemble Fe-S complexes) fused N-terminally to a homolog of NUBP2/CFD1 which participate in cytosolic Fe-S cluster assembly. Recall CFD1 is fused to CIAO1 in S. pombe, consistent with the three proteins forming a heteroligomer.

The underlying premise of DUF59 as valid domain defined by sequence is validated by good structural alignments across the five PDB structures available for it. While the diversified roles do not always have a clear connection to iron sulfur cluster metabolism, features such as active site and reaction catalyzed (if any) might transfer to a direct function for SufT and human FAM96B and FAM96A.

Gene    PDB    UniProt   PubMed             Species               Comment

FAM96A  3UX2   Q9H5X1    22683786,2261886   Homo sapiens           cytosolic 4Fe-4S cluster formation
FAM96B '3UX2'  Q9Y3D0    22678362,22678361  Homo sapiens           from FAM96A utilizing >50% sequence identity
DUF59   1WCJ   TM0487    16199668,15213465  Thermotogo maritima    implications for 216 homologous DUF59 protein. 1UWD
DUF59   3LNO   Q81XF6    --------           Bacillus anthracis     article never published
DUF59   3CQ1   Q53W28    --------           Thermus thermophilus   assigned to dDTP-4-Keto-L-Rhamnose Reductase TTHB138, aka 2CU6

HCF101  ----   Q6STH5    14690502,19817716  Arabidopsis thaliana   chloroplast 4Fe-4S cluster formation
PaaD    ----   G8RCQ5    16199668           Staphylococcus aureus  aromatic ring hydroxylating enzyme
PaaJ    ----   O84984    9748275,9600981    Pseudomonas putida     thiolase in phenylacetic acid degradation aka PhaH
SufT    ----   Q0K120    --------           Ralstonia eutropha     iron sulfur cluster assembly protein

Thus although human FAM98B and bacterial SufT are very diverged in primary sequence, multiple lines of evidence support bona fide homology, a surprising result that mixes -- within human -- a component of the 'backup' bacterial SUF system of iron sulfur complex formation together with the main bacterial ISC system. SufT has been located within the SUF operon in at least three genera of bacteria as SufABCDSUTR in Ralstonia, Cupriavidus and Pseudogulbenkiania -- this can't be coincidence given the rarity of the DUF59 domain and involvement of both in iron sulfur cluster formation.

SufT.png


Phenyl.png
Click to enlarge

Another important clue to FAM98B/SufT function may come from additional insights into the steps of the phenylacetic acid degradation pathway] -- an esoteric topic but exceedingly well-studied.

An epic annotation error has propagated to thousands of GenBank and UniProt entries: the DUF59 domain of the phenylacetate catabolic pathway lies in PaaD, not PaaJ (which has only thiolase domains). Some entries state -- nonsensically -- that the PaaD protein is the product of the PaaJ gene; overall 85% of PaaD homologs are incorrectly named PaaJ (with the E.coli accession P76080 for ydbQ as correct starting point for PaaD):

>PaaD_escCol Escherichia coli 8 conserved cysteines P76080 PaaJ ydbQ DUF59 unacceptable synonym: PaaJ 
MQRLATIAPPQVHEIWALLSQIPDPEIPVLTITDLGMVRNVTQMGEGWVIGFTPTYSGCPATEHLIGAIREAMTTNGFTPVQV
VLQLDPAWTTDWMTPDARERLREYGISPPAGHSCHAHLPPEVRCPRCASVHTTLISEFGSTACKALYRCDSCREPFDYFKCI*

The initial aromatic ring oxygenation (using O2) utilizes a multisubunit complex requiring PaaA, PaaB, PaaC, and PaaE for in vitro reconstitution of catalytic activity. PaaD has no place in the complex but an essential role in vivo as established by mutation and supported by position within the Paa operon in many species.

Together, this suggests the DUF59 domain of PaaD establishes and/or repairs the 2Fe-2S cluster of PaaE reductase (which might be especially vulnerable to reactive oxygen species in the oligomer). Such a role for PaaD would not be a great departure from what its homolog does in eukaryotes. Note PaaA itself has a di-iron center though its regulatory paralog PaaC does not.

The DUF59 domain appears in multiple contexts in bacteria -- SufT, PaaD, YITW, MIP18 and rhamnose reductase-related protein. Some of this is attributable to poor quality computer annotation and nomenclatural confusion across species, but DUF59 does reside in at least two distinct operons, the iron sulfur cluster system Suf and the phenylacetic acid catabolism pathway Paa, the difference being that the DUF59 acts on a broader class of iron-sulfur apoproteins in bacterial species with a SufT-containing operon.

The question here is whether all remaining DUF59 homologs assist in iron sulfur complex assembly, either specialized to a one apoenzyme or as part of a general system maturating numerous unrelated apoenzymes (like eukaryotic FAM96B). Alternatively -- consistent with poor percentage identity -- the DUF59 domain duplicated and diverged into dimly related functions with little in common apart from a shared fold. However this would allow multiple DUF59 domains within a single prokaryotic genome, so far not observed.

The first alternative implies that each enzyme closely associated to a DUF59 contains a Fe-S cluster. However these have proven notoriously difficult to detect in the case of DNA helicases, polymerases and primases. The problem arises from loss during aerobic protein purification (perhaps with replacement by Zn) and lack of reliable bioinformatic signature for iron-sulfur clusters, notably an 'insufficient' number of conserved liganding cysteines (due to composite dimeric sites or glutathione contributing unsuspected cysteines), a lack of consistent pattern spacing in the cysteines, and ambiguity relative dedicated zinc binding sites.

Alignment of FAM96A and FAM96B in phylogenetic order:

FAM96A_homSap   --EKALEVYDLIRTIRDPEKPNTLEELEVVSESCVEVQEINEEEYLVIIRFTPTVPHCSLATLIGLCLRVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_calJac   --EKALEVYDLIRTIRDPEKPSTLEELEVVSESCVEVQEINEEEYLVIIRFTPTVPHCSLATLIGLCLRVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_otoGar   --EKALEIYDLIRTIRDPEKPNTLEELEVVTESCVEVQEINEEDYLVIIKFTPTVPHCSLATLIGLCLRVKLQRCFPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_tupBel   --EKALEVYDLIRTIRDPEKPNTLEELDVVTESCVEVQEINEDDYLVIIRFTPTVPHCSLATLIGLCLRVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_musMus   --EKALEVYDLIRTIRDPEKPNTLEELEVVTESCVEVQEINEDDYLVIIKFTPTVPHCSLATLIGLCLRVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_oryCun   --EKALEVYDLIRTIRDPEKPNTLEELEVVTESCVEVQEINEDDYLVVIRFTPTVPHCSLATLIGLCLRVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_bosTau   --EKALEVYDLIRTIRDPEKPNTLEELEVVTESCVEVQEINEDDYLVIIRFTPTVPHCSLATLIGLCLRVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_canFam   --EKALEVYDLIRTIRDPEKPNTLEELEVVTESSVEVQEINEEDYLVIIRFTPTVPHCSLATLIGLCLRVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_loxAfr   --EKALEVYDLIRNIRDPEKPNTLEELEVVTESCVEVQEINEDDYLVIIRFTPTVPHCSLATLIGLCLRVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_choHof   --EKALEVYDLIKIIQDPEKPNTLEEPEVATESCVEVQEINEEDYLVII-FTPTVPHCCLATLIGLCLRVKLQRCLPFKHNLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_monDom   --EKALEVYDIIRTIRDPEKPNTLEELEVVTESCVEVKEIHEEDYLVIIRFTPTVPHCSLATLIGLCLRVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVIEPD
FAM96A_ornAna   --DKALEVYDLIRTIRDPEKPNTLEELEVVTESCVKVKEVDEDDYLVIIRFTPTVPHCSLATLIGLCLRVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_taeGut   --DRAIEVYDIIRTIRDPEKPNTLEELEVVTENCVQVQEIGEDEYLVIIRFTPTVPHCSLATLIGLCLRIKLQRCLPFRHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVTEPD
FAM96A_galgal   --DKALEVYDIIRTIRDPEKPNTLEELDVVTESCVQVDEIGEEEYLVVIRFTPTVPHCSLATLIGLCLRIKLQRCLPFRHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVTEPD
FAM96A_chrPic   --DRALEVYDIIRTIRDPEKPNTLEELEVVTESCVEVHEIGEDEYLVIIRFTPTVPHCSLATLIGLCLRIKLQRCLPFKHKLEIYISEGAHSTEEDVNKQINDKERVAAAMENPNLREIVEQCVTEPD
FAM96A_anoCar   --ERALEVYDIIRTIRDPEKPNTLEELDVVTESCVEVHETSEDEYLVTIRFTPTVPHCSLATLIGLCLRIKLQRCLPFKHKLEIFISEGAHSIEEDINKQINDKERVAAAMENPNLREIVEQCVLEPD
FAM96A_xenTro   --ERALEVYDIIRNIRDPEKPNTLEDLDVVSESCVSVQELDEECYLVVIRFTPTVPHCSLATLIGLCLRVKLQRCLSFKHKLEIYISEGTHSTEEDINKQINDKERVSAAMENPNLREIVEQCVTEPD
FAM96A_danRef   --EKALEVYDVIRTIRDPEKPNTLEELDVVTEKCVEVQELGDDEYLIVIKFSPTVPHCSLATLIGLCLQVKLQRCLPFKHKLEIYITEGTHSIEEDINKQINDKERVAAAMENPNLREIVEQCVTEPD
FAM96A_oreNil   --EKALEVYDVIKSIRDPEKPNTLEELEVVTEKCVEVQELGEDEYLIIIRFSPTVPHCSLATLIGLCLQVKLQRCLPFKHKLEIYISEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVTEPD
FAM96A_oryLat   --EKALEVYDVIRSIRDPEKPNTLEELEVVTEKCVEVQDLGEDEYLIIIKFSPTVPHCSLATLIGLCLQVKLQRCLPFKHKLEIYLSEGTHSTEEDINKQINDKERVAAAMENPNLREIVEQCVTEPD
FAM96A_cioInt   MEDYEGTIYDIIRTIKDPEKPGSLEDLDVVYEEGVSVKTSENHRCNVEVKFRPTIKHCSLATLIGLCLHVKLQRTLPTTHKIRVFVKEGSHNTEDEVNKQINDKERIAAAMENPNIRKMVENCIKEPD
FAM96A_braFlo   LDDLSDIVYDLIRDIRDPEKDNTLEELDVVYESGVHVEPWGEDKFHISIEFTPTVPHCSLATLIGLCLRVKLENNLPQHYKLDITVKEGTHSTGPEINKQINDKERIAAAMENPDLRAVVNKCVQDPE
FAM96A_sacKow   EKELAEEIYDIIRTIRDPEKPQTLEDLDVVYEDGVLVNHRGTDEFLVNVEFTPTVPHCTLATLIGLCIRVKLQRTLPHSYKLDIFIKKGTHSTEDEINKQINDKERIAAAMENPNLKDLVDNCVVDLE
FAM96A_strPur   LNGMAGDIYDIIRDIQDPEKPNTLEDLEVVYEEGVTVAALETEEQLINIEFTPTVPHCSLATLIGLCLRVRLERSLPNKHKLDIIVKKGTHATEDDINKQINDKERIAAAMENPNLRKLVEHCVSIED
FAM96A_triCas   DSELKYTVYDLIRTIKDPEKPNTLEELNVVYEEGVEVKERTSGNVSVVVEFNPTVPHCSLATLIGLCIRIKLERCIPYRIKLDIYIKAGAHTTEHEINKQINDKERIAAAMENPNLREMVENCIVEED
FAM96A_nemVec   NRNLALDVYDLIKDIKDPEKPQTLEDLKVVYESCVEVQKVAGQDHIT-ITFTPTVPHCSLATLIGLCIRVKLEKSLPEKFKLDIYLKKGTHSTENEINKQINDKERIAAAMENPNLRKIVENCIDEDN
FAM96A_acrPal   NLVLVQEVFDIVKDIRDPELPQTLEELHVIEEEFIKIDKIENDEYIIKIEFTPTVPHCSLATLIGLCLRVKLERSLPYKFKLDIFLSRGTHSTENEINKQINDKERIAAAMENPNLKKIVEECILDAN
FAM96A_triAdh   NQKLCSQIFELIRDIKDPELPQTLEELNVVTEDEIFVRNMKQGEACIRINFTPTVPHCSLATLIGLCIRVKLQRCLDQDYKLDIYVTKGSHDTEDGVNKQINDKERVAAAIENPNVKKLVEECLQEVQ

FAM96B_homSap   DSIDAREIFDLIRSINDPEHPLTLEELNVVEQVRVQV---SDPESTVAVAFTPTIPHCSMATLIGLSIKVKLLRSLPQRFKMDVHITPGTHASEHAVNKQLADKERVAAALENTHLLEVVNQCLSARS
FAM96B_papHam   DSIDAREIFDLIRSINDPEHPLTLEELNVVEQVRVQV---SDPESTVAVAFTPTIPHCSMATLIGLSIKVKLLRSLPQRFKMDVHITPGTHASEHAVNKQLADKERVAAALENTHLLEVVNQCLSARP
FAM96B_micMur   DSIDAREIFDLIRSINDPEHPLTLEELNVVEQVRVQV---SDPESTVAVAFTPTIPHCSMATLIGLSIKVKLLRSLPQRFKMDVHITPGTHASEHAVNKQLADKERVAAALENTHLLEVVNQCLSARS
FAM96B_tupBel   DSIDAREIFDLIRSINDPEHPLTLEELNVVEQVRVQV---SDPESTVAVAFTPTIPHCSMATLIGLSIKVKLLRSLPQRFKMDVHITPGTHASEHAVNKQLADKERVAAALENTHLLEVVNQCLSARS
FAM96B_musMus   DSIDAREIFDLIRSINDPEHPLTLEELNVVEQVRIQV---SDPESTVAVAFTPTIPHCSMATLIGLSIKVKLLRSLPQRFKMDVHITPGTHASEHAVNKQLADKERVAAALENTHLLEVVNQCLSars
FAM96B_oryCun   DSIDAREIFDLIRSINDPEHPLTLEELNVVEQVRVQV---SDPESTVAVAFTPTIPHCSMATLIGLSIKVKLLRSLPQRFKMDVHITPGTHASEHAVNKQLADKERVAAALENTHLLEVVNQCLSARS
FAM96B_bosTau   DSIDAREIFDLIRSINDPEHPLTLEELNVVEQVRVQV---SDPESTVAVAFTPTIPHCSMATLIGLSIKVKLLRSLPQRFKMDVHITPGTHASEHAVNKQLADKERVAAALENTHLLEVVNQCLSARS
FAM96B_canFam   DSIDAREIFDLIRSINDPEHPLTLEELNVVEQVRVQV---SDPESTVAVAFTPTIPHCSMATLIGLSIKVKLLRSLPQRFKMDVHITPGTHASEHAGKKQLADKERVAPPLENTHLLEVVNQCLSARS
FAM96B_loxAfr   DSIDAREIFDLIRSINDPEHPLTLEELNVVEQVRVQV---SDPESTVAVAFTPTIPHCSMATLIGLSIKVKLLRSLPQRFKMDVHITPGTHASEHAVNKQLADKERVAAALENTHLLEVVNQCLSARS
FAM96B_choHof   DSIDAREIFDLIRSINDPEHPLTLEELNVVEQVRVQV---SDPESTVAVAFTPTIPHCSMATLIGLSIKVKLLRSLPQRFKMDVHITPGTHASEHAVNKQLADKERVAAALENTHLLEVVNQCLSARS
FAM96B_macEug   DSIDDREIFGLIRSINDPEHPLTLEELNVVEQVRVKV---NDRESTVAVEFTPTIPHCSMATLIGLSIKVKLIRSLPERFKMDVHITPGTHASEHAVNKQLADKERVAAALENSHLLEVVNQCLSARS
FAM96B_monDom   DSIDDREIFVLIRSINDPEHPLTLEELNVVEQVRVKV---NDRESTVAVEFTPTIPHCSMATLIGLSIKVKLIRSLPERFKMDVHITPGTHASEHAVNKQLADKERVAAALENSHLLEVVNQCLSARS
FAM96B_galGal   DSIDDREIFDLIRSINDPEHPLTLEELNVVEQVRVKV---NDAESTVAVEFTPTIPHCSMATLIGLSIKVKLIRSLPERFKMDVHITPGTHASEHAVNKQLADKERVAAALENSHLLEVVNQCLSARS
FAM96B_xenTro   DRIDDREIFDLIRCINDPEHPLTLEELNVVEEIRVKV---SDEESTVSVEFTPTIPHCSMATLIGLSIKVKLLRSLPERFKVDVHITPGTHASEHAVNKQLADKERVAAALENSHLLEVVNQCLSGRS
FAM96B_tetNig   DPIDDREIFDLIRTINDPEHPLSLEELNVVEQVRVKV---NDAESTVDVEFTPTIPHCSMATLIGLSIKVKLLRCLPNRFKIDVHITPGTHASEEAVNKQLADKERVAAALENSSLLEVVNQCLSSRG
FAM96B_gasAcu   DPIDDREIFDLIRAINDPEHPLSLEELNVVEQVRVQV---NDEESIVGIEFTPTIPHCSMATLIGLSIKVKLLRSLPDRFKIDVHITPGTHASEEAVNKQLADKERVAAALENSSLLEVVNQLTPTRG
FAM96B_danRer   DPIDVREIFDLIRSINDPEHPLSLEELNVVEQVRVNV---NDEESTVSVEFTPTIPHCSMATLIGLSIKVKLLRSLPDRFKIDVHITPGTHASEDAVNKQLADKERVAAALENSQLLEVVNQCLSSRG
FAM96B_petMar   DEIDSREVFDLIRGINDPEHPLTLEELKVVEEAYVSV---TDAESMVVVAFTPTIPHCSMATLIGLAIRVQLLRCLPDRFKVDVHIAPGMHASEHAVNKQLADKERVAAALENSHLLGVVNQCLGGRK
FAM96B_cioInt   DPFDRREIFDLIRDINDPEHPLTLEDLRVVSENDIEV---DDEKSFIKVSFTPTIPHCSMATLIGLAIRVRLLRSLPPRFKVEVEISPGSHQSEKAVNKQLGDKERVAAALENNHLLNVVNQCLTgrk
FAM96B_braFlo   DAIDAREIFDILSSINDPEHPLTLEELNVIEQSRITV---DEDNNHVSVEFTPTIPHCSMATLIGLSIRVKLLRALPTRFKVDVHITPGTHQSEHAVNKQLADKERVAAALENQHLLEVVNQCLSTRN
FAM96B_strPur   DAIDTREVFDLIRNINDPEHPLTLEELNVVQQAEVEV---DDPGNVVKVTFTPTIPHCSMATLIGLAIRVKLIRSLPSRFKVDINIKPGTHVSENAVNKQLADKERVAAALENNHLLEVVNQCLTQRD
FAM96B_monFav   DKIDEREVFDLIRSINDPEHPLTLEQLNVVEQSLVEV---DDTNNYVKIQFTPTIPHCSMATLIGLAIRVQLLRSLPDRFKVDISITPGTHASEDAVNKQLADKERVAAALENTHLLEVVNQCLAVRH
FAM96B_nemVec   DKIDDREIFDMIRSINDPEHPLTLEELNVVEQALIDV---SDDESYVKVQFTPTIPHCSMATLIGLAIRVRLLRSLPDRFKVDVKITPGTHQSEIAVNKQLADKERVAAALENNHLLDVIDQCLVSKK
FAM96B_plePil   dkiddreivdmirsINDPEHPNSLEELSVVQLDLITC---NDTDNYVDVKFTPTIPHCSMATLIGLSLKVKLLRSLASRFKVDVRITPGSHSTEEAINKQLADKERVAAALENPQLVNMVNQCIYGkk
FAM96B_ampQue   DEIDAREVFDLIRHINDPEHPLTLEELNVVQEDLICI---NNKENFVSVHFTPTIPHCSMATLIGLSIRVCLLRSLPNRFKIDVIITPGSHMSEQAINKQLADKERIAAAIENSHLLNVVHQCLNTKR
FAM96B_subDom   DEIDAREVFDLVKNINDPEHPLTLEQLNVVQLGHIDV---SDVDSSVTVYFTPTIPHCSMATLIGLSIRVRLLRALPARFKVDVMISPGTHASEVAVNKQLADKERIAAALENNHLLDVVNSCLTGVr
FAM96B_triAdh   DKIDEREIFDIIRSINDPEHPLTLEELNVVEECKIDV---DDDNNFVKVHFTPTIPHCSMATLIGLCIRVRLIRSLPERFKVDITVTPGSHSSEIAVNKQLADKERVAAAMENSNLLKVVNQCLAMDr
FAM96B_monBre   DPFDSREIFDLVRHINDPEHPLTLEELNVVRLDQILV---DDAQNYVRVQFTPTIPHCSMASLIGLCLRVRLLRALPPRFKVDVEIFPGTHATEASINKQLADKERVAAALENPNLKTVVNECLQLDD

FAM96B_sacCer   DLIDAQEIYDLIAHISDPEHPLSLGQLSVVNLEDIDVHDSGNQNAEVVIKITPTITHCSLATLIGLGIRVRLERSLPPRFRITILLKKGTHDSENQVNKQLNDKERVAAACENEQLLGVVSKMLVTCK
FAM96B_ajeDer   EPIDEQEIYDLIATIADPEHPISLGALAVVSLPDISIKPPDSPLRTVSVLITPTITHCSLATVIGLGVRVRLEQSLPPRFRVDVRIKEGTHSTADEVNKQLADKERVAAALENGTLMGVIGKMLETCQ
FAM96B_ashGos   DPVDPQEIYDLIAHISDPEHPLTLGQLAVVNLPDIEVRDSGDPHAEVVVRITPTITHCSLATLIGLGIRVRLERSLTPRFRITVLLKKGSHQSENQVNKQLNDKERVAAACENEQLVEVVSKMLSTCK
FAM96B_canAlb   DPIDEQEIFDLIATISDPEHPLTLAQLAVVNLSDIKITNDGGGGSEVLIKITPTITHCSLATLIGLGIRVRLDRSLPSRYRIKILIKEGTHQSENQVNKQLNDKERVAAACENDQLLNVISQMLSTCK
FAM96B_dekBru   EPIDAQEIYDLTASISDPEHPLTLGQLAVXNLNDIEVKNASDKSGEILLRITPTISQCSLATLIGLGIRVRLDRCLPKRFRITILLKEGTHQTEKQVNKQLNDKERVSAAAENPQLLKVISNMLSSCE
FAM96B_kluLac   DPIDAQEIYDLIAHISDPEHPLTLGQLAVVNLADIEVHDTNGKDAEVIVRITPTITHCSLATLIGLGIRVRLERSLSPRFRITILLKKGTHQSENQVNKQLNDKERVAAACENDQLLGVVSKMLSTCK
FAM96B_komPas   ESVDALEIYDLISSISDPEHPLTLGQLAVVNLEDIQLDDSGNPNAEVIIKITPTITHCSLATLIGLGIRVRLERCLPPRYRIIIKVKEKTHQSENQVNKQLNDKERVSAACENDQLLKVISQMLSSCK
FAM96B_parBra   EPIDEQEIFDLISTIADPEHPISLGSLAVVSLPDISIRPPDSPLRTVTVLITPTITHCSLATVIGLGVRVRLEQSLPHRFRVDVRIKEGTHSTADEVNKQLADKERVAAALENGTLMGVIGRMLETCQ
FAM96B_schPom   DPIDPQEIYDLLAKINDPEHPLTLAQLSVVKLEDIEVVDNVEGDSYITVHITPTIPHCSMCTLIGLCIRVRLERCLPPRFHVDVKVKKGTHASESQVNKQLNDKERVAAACENEQLLSVLNGMMATCV
FAM96B_triAtr   EAIDEQEIYDLISNITDPEHPVSLGQLSVINLPDIHITPVPSPNVQVTVELTPTVTHCSLATVLGLGVRVRLEQVLPPNYRVEVICKENSHSQDDQVNKQLSDKERVAAALENDSLKSVLDKMLESCI
FAM96B_yarLip   EPIDSQEIYDLIATISDPEHPLTLGQLAVVKLEDIWVHDTGDKNAEIVVKITPTITHCSLATLIGLGIRVRLERALPPRFRFTITVKEGTHQSENQVNKQLNDKERVAAACENEQLLGVISGMLATCQ

FAM96B_micSpp   DPVDAIEVFYHIKNINDPEHPYSLEQLDIVSVENIRV---HSEAQFIQVYFTPTVPHCSMATLIGLAIRRKLQESLAGRFKTEVLVFPGSHSSESAVNKQLNDKERVAAALENTNLLEKVNLCLRGNL
FAM96B_ostLuc   DAVDALEIFDHVRDINDPEHPYSLERLNVVGASAIEC---DDARNRVRVEFTPTVPHCSMATLIGLSIRVKLLRTLPRRFKVDVVIAPGTHASERAVNKQLNDKERVAAALENGNLLEKVDLCLSGKT
FAM96B_araTha   EPIDQLEIFDHIRDIKDPEHPNTLEDLRVVTEDSVEV---DDENSYVRVTFTPTVEHCSMATVIGLCVRVKLLRSLPSRYKIDIRVAPGSHATEDALNKQLNDKERVAAALENPNLVEMVDECLPSEE
FAM96B_vitVin   EPVDQQEIFDHIRDIKDPEHPYSLEELKVITEDAIEV---DDKRSYVRVTFTPTVEHCSMATVIGLCLRVKLLRSLPSRYKVDIKVAPGTHATEAAVNKQLNDKERVAAALENPNLLDMVDECLAPSY
FAM96B_popTri   EPIDQLEVFDHIRDIKDPEHPYSLEELKVITEDAIEV---DDNHSYVRVTFTPTVEHCSMATVIGLCLRVKLMRSLPQRYKVDIRVAPGTHATESAVNKQLNDKERVAAALENPNLVDMVDECLAPSY
FAM96B_zeaMay   EPIDQLEIFDHIRDIKDPEHPYSLEQLNVVTEDSIEL---NDESNYVRVTFTPTVEHCSMATIIGLCIRVKLVRSLPPRYKVDIRVAPGSHATEAAVNKQLNDKERVAAALENPNLLDMVEECLSPTF
FAM96B_braDis   EPIDQLEIFDHIRDIKDPEHPYSLEELNVVTEESVEI---NDKLSHVRVTFTPTVEHCSMATVIGLCVRVKLIRSLPPRYKVDIRVAPGSHATETAVNKQLNDKERVAAALENPNLLDIVEECLAPTF

FAM96B_dicDis   DEFDEQEIFDLVRSITDPEHPLTLEQLNVVRIENVNI---NLENSYILLYFTPTVPHCSMANLIGLSIKEKLARSLPKRFKVDVIVTPGSHSSESSVNKQLNDKERVSAALDSSSILTIVNECIKQN-
FAM96B_polPal   DDFDVYEIFDLVRDINDPEHPLTLEQLNVVRHENIKI---DISNNIIRLYFTPTVPHCSMANIIGLSIKEKLSRSLPQRFKVDVKVTPGSHSSEQSVNKQLNDKERVSAALDSSSILNVVNECIKLPI
FAM96B_entDis   EDIDQLEIYEHIRRIKDPEHPVTLEQLKVISPDLINV---DDKGNHIIVKFTPTVDNCTMATLIGLTIRTKLMRILPPRIKLDIYLTKGTHQTEEDVNKQLNDKERIAAALEKQTLLQLVNKCLIlpi
FAM96B_phyInf   DPFEPDEVFEILRHINDPEHPLTLEQLKVMSLENVHV---DDVNSRVKIFFTPTIPHCSMATLIGLCLRVKLLRSLPSRFKVDILITPGTHSSEAAVNKQLNDKERVAAALENSHLLTVVNKCIAHTD
FAM96B_thaPse   DAITVNEIFDIVRNIQDPEHPLTLEQLNVVRLELIKV---VDSFSTVHVQFTPTIPHCSMATLIGLSLRVKLLRSLPPRFKVVVEIESGTHASEHAVNKQLADKERVRAALENEHLLGVVNKCIAGVA
FAM96B_phaTri   DMVDADEVFEIIRNIQDPEHPLTLEQLGVVSKRQIDV---HDSYSTLDVRFTPTIPHCSMATHIGLCLRVKLDRSLPPRFKVKVRIEPGSHSSETAINKQLADKERVCAALENKHLLGIVNRCIIDGM
FAM96B_naeGru   DEFDALEVYDLIRNINDPEHPLSLEQLKVTQHDLITV---DNKNNLIVIYFTPTITHCSMATLIGLSIRVKLLRSLPKRFKVDIFITPGTHQSEDQVNKQLNDKERVAAALENERLLSVVNRCIAQS-
FAM96B_triVag   EAIDSLELYNYIRLIKDPEHPFSLEQLHIVSPDDIKV---DDKEGRVNLVFTPTVPNCSLPAVLGLCIRERLLQVLPQRFKIFITVARGKHIQEDSINRQLRDKERCLAALERRNIRTMIDNCIACDD
FAM96B_cryMur   SEITPMDIFEIIRRIKDPEYPLTLEQLNVVELKNISV---DNNANRVIVYFTPTITSCSQASLIGLSILFKLTFTLPSRFKVIIKVTPGSYDSEEALNKQMRDKERVRAALENMQIFKAITRGIVNSD
FAM96B_babBov   DEFEVTEIFNIIRNIKDPEYSYTLESLKIVEPENIDI---DQENAIVTVKFTPTVPHCSQATIIGLMIYVKLQQSLPLHFKIDVQITEGTHNTEDAINKQLLDKERVAAALENPVLLDMINDGIYNTV
FAM96B_tetThe   DEIDQLEIFDLIRHIDDPEHPLTLEQLNVLQPENIKV---NIDHKLVTVLFTPTIPHCSLAQIIGLMIKVKLIRSLPRDYKVDVYITPGTHVQELSVNKQINDKERVMAAIENPSILRVVNKGVSNSD
FAM96B_theAnn   ESFDEEEIFDIIRTIKDPEYSYSLEDLNVVSKDNIFI---DEDTSTISVFFTPTVPHCTQASIIGLMIFVKLYQSLPPYFKIDVQISKGTHNTEEMINKQLLDKERISAALEYPPILKMINKGILFLQ
FAM96B_tryCru   DPIDSLEVFHHIRSIRDPEHPNTLEELKVVEPELIRV---DEVKQTVRVQFTPTVPHCSMTTLIGLCISLKLQRSLPRGTKVDVYVTPGSHEQEEQVNKQLNDKERVAAALENKNLLNVVESCLNEFE
FAM96B_leiInf   DPIDAWEVFEIIRRIRDPEHPNSLEQLKVVEPSLITV---DWKKRHIRVLFTPTVPHCSLTTLIGLSIRLQLERSLPEYTKVDIYVTPGTHEQEAQVNKQLNDKERVAAALENCNLLNVVESCINEFD

NARFL (IOP1)

(coming shortly)

ERCC2 (XPD)

(coming shortly)

Curated reference sequences

It serves no current purpose to collect all possible full length MMS19 sequences from GenBank, so only a sample of 20 uniformly distributed over the eukaryotic phylogenetic tree is provided here. MMS19 presents no real homology complications, being present as a single-copy gene. Genes in early diverging eukaryotes are assumed single-exon, ie taken as the largest open reading frame enveloping the match to the ultra-conserved region. MMS19 is studied experimentally only in yeast and human.

The apparent absence in Giardia and various obligate parasites could be attributable to a reduced genome, extreme sequence divergence relative to available probes, or incomplete assembly -- it is inconceivable that these species lack core iron sulfur proteins of DNA metabolism. Indeed, the conserved cysteine pattern of primase large subunit are readily located in these species. It remains conceivable however that the very earliest diverging eukaryotes retain components of the archaeal iron sulfur cluster formation system.

The yeast gene, sometimes called MET18 in that literature, is unsurprisingly single-exon (only 283 of 6000 yeast proteins have them) and not located in a yeast-type operon. While some immediate neighbors are involved in DNA processes, none are homologous to iron sulfur cluster assembly components or have recognized 4Fe-4S cofactors themselves.

Gene   Position      Description

MET18  chrIX:113806  DNA repair, TFIIH regulator, nucleotide excision repair, RNA polymerase II, telomere maintenance
RRT14  chrIX:117024  rDNA transcription, localizes to nucleolus, involved in ribosome biogenesis
STH1   chrIX:117992  ATPase component in chromatin remodeling, expression of early meiotic genes, helicase-related protein homologous to Snf2p
KGD1   chrIX:122689  mitochondrial alpha-ketoglutarate dehydrogenase
ASG1   chrIX:102782  zinc cluster transcriptional regulator stress response
CSM2   chrIX:99860   homologous recombination repair, accurate chromosome segregation during meiosis
SIM1   chrIX:128151  may participate in DNA replication

The human gene has 31 coding exons. These do not correspond to natural structural breaks in the tertiary structure (eg HEAT units) and the ultra-conserved regions is spread across parts of 3 exons. Thus despite its modular structure, MMS19 had already completed its internal expansion of domain units prior to the main era of exon formation and could not today expand further by exon duplication because these would present issues of compatible [phasing] as well as not corresponding cleanly to structural units.

Exon structure of human MMS19: columns show exon number, amino acid size, intron phasing (donor bp overhang), primary sequence, and ultra-conserved region.

1   37  1  MAAAAAVEAAAPMGALWGLVHDFVVGQQEGPADQVAA
2   17  2  DVKSGNYTVLQVVEALG
3   33  1  SSLENPEPRTRARAIQLLSQVLLHCHTLLLEKE
4   29  0  VVHLILFYENRLKDHHLVIPSVLQGLKAL
5   25  0  SLCVALPPGLAVSVLKAIFQEVHVQ
6   23  1  SLPQVDRHTVYNIITNFMRTREE
7   43  1  ELKSLGADFTFGFIQVMDGEKDPRNLLVAFRIVHDLISRDYSL
8   21  0  GPFVEELFEVTSCYFPIDFTP
9   29  0  PPNDPHGIQREDLILSLRAVLASTPRFAE
10  25  0  FLLPLLIEKVDSEVLSAKLDSLQTL
11  26  0  NACCAVYGQKELKDFLPSLWASIRRE
12  46  1  VFQTASERVEAEGLAALHSLTACLSRSVLRADAEDLLDSFLSNILQ
13  52  0  DCRHHLCEPDMKLVWPSAKLLQAAAGASARACDSVTSNVLPLLLEQFHKHSQ
14  26  1  SSQRRTILEMLLGFLKLQQKWSYEDK
15  42  1  DQRPLNGFKDQLCSLVFMALTDPSTQLQLVGIRTLTVLGAQP
16  28  2  DLLSYEDLELAVGHLYRLSFLKEDSQSC
17  33  1  RVAALEASGTLAALYPVAFSSHLVPKLAEELRV
18  50  1  GESNLTNGDEPTQCSRHLCCLQALSAVSTHPSIVKETLPLLLQHLWQVNR
19  52  1  GNMVAQSSDVIAVCQSLRQMAEKCQQDPESCWYFHQTAIPCLLALAVQASMP
20  34  2  EKEPSVLRKVLLEDEVLAAMVSVIGTATTHLSPE
21  34  0  LAAQSVTHIVPLFLDGNVSFLPENSFPSRFQPFQ
22  23  0  DGSSGQRRLIALLMAFVCSLPRN
23  42  1  VEIPQLNQLMRELLELSCCHSCPFSSTAAAKCFAGLLNKHPA
24  34  0  GQQLDEFLQLAVDKVEAGLGSGPCRSQAFTLLLW
25  19  0  VTKALVLRYHPLSSCLTAR
26  62  1  LMGLLSDPELGPAAADGFSLLMSDCTDVLTRAGHAEVRIMFRQRFFTDNVPALVQGFHAAPQ
27  28  0  DVKPNYLKGLSHVLNRLPKPVLLPELPT
28  55  0  LLSLLLEALSCPDCVVQLSTLSCLQPLLLEAPQVMSLHVDTLVTKFLNLSSSPSM
29  20  0  AVRIAALQCMHALTRLPTPV
30  34  2  LLPYKPQVIRALAKPLDDKKRLVRKEAVSARGEW
31   9  0  FLLGSPGS*
Alignment of ultra-conserved region:

MMS19_homSap   FTFGFIQVMDGEKDPRNLLVAFRIVHDLI-------SRDYSLGPFVEELFEVTSCYFPIDFTPPPNDPHG-IQREDLILSLR
MMS19_musMus   FTFGFIQVMDGEKDPRNLLLAFRIVHDLI-------SKDYSLGPFVEELFEVTSCYFPIDFTPPPNDPYG-IQREDLILSLR
MMS19_cioInt   FLYQYIQVIDGEQDPRNLLTIFQLTKNLI-------ESSFPLFDLVEELFDVSSCYFPIDFNPAAAGKKSTITNLDLVSSLR
MMS19_braFlo   FVWGFIQAMDGEKDPRNLIIAFSIAR-IV-------AQAFPIGTFTEELFEVISCYFPIDFTPPADDPHG-VTREDLVLGLR
MMS19_strPur   FVLGLLHAMDGEKDPRNLILLFNILP-TV-------INNFKIDMFIEETFEVVACYYPVDFHPPPNDPYG-ISREKLALSLK
MMS19_sacKow   FVFGYIQCMDGEKDPRNLTMIFRCVP-II-------IHNFPIDVFIEELFEVVSCYFPIDFTPPPNDPYK-VTQEELVLGLR
MMS19_dapPul   FVFGLIQLADQERDPRNLLILFSIFPVVA--------RYFRFEPFTEEFFEVFSCYFPIDFTPPANDPYA-VTKEQLCDGLR
MMS19_droMel   FVYGLINSIDGERDPRNLDIIFSFMPEFL--------STYPLLHLAEEMFEIFACYFPIDFNPSKQDPAA-ITRDELSKKLT
MMS19_nemVec   LVFGFLQAMDGEKDPRNLVVAFKLAR-II-------IKNFPIGLFAEDLFEVTSCYFPIDFTP-------------------
MMS19_triAdh   FVFGYIQVMDGEKDPRNLLLALKIAKFIV--------QNFNIDLFLDDFFEIISCYFPIDFTPPPNLP----SNENVTK---
MMS19_sacCer   FIETFLHVANGEKDPRNLLLSFALNKSIT-------SSLQNVENFKEDLFDVLFCYFPITFKPPKHDPYK-ISNQDLKTALR
MMS19_schPom   FFSGICSTFAGEKDPRNLMLVFSMLK-KI-------LSTFPIDGFEQQFFDITYCYFPITFRAPPDATNLAITSDDLKIALR
MMS19_araTha   LVYAMCEAIDGEKDPQCLMIVFHLVELLAPLFP---SPSGPLASDASDLFEVIGCYFPLHFTHTKDDEAN-IRREDLSRGLL
MMS19_dicDis   FMVGYLQFIDNEKDPRNLIFSFKLLPKVIYNIP---EHKHFLES----LFEIISCYFPISFNPKGNDPNS-ITKDDLSNSLL
MMS19_pytUlt   FAQAFLNAMEGEKDPRNLLLCLQIARELLAKLE---VVFDRHDAVLQQYFDVVSCYFPITFTPPPNDPYG-ITSEELILSLR
MMS19_sapPar   LMDGFLRAMSGEKDPRNLLFCLRFAAELLTTYA---NVVDAD--VAKGFFDATSCYFPITFRPPPNDPYG-ITSEDLVLALR
MMS19_polPal   FMAGFLQFIDGEKDPRNIIYTFRLIPRVILYIP---EYKNFADS----LFEILSCYFPISFNPKPGDPNS-ITKDDLVSSLL
MMS19_entHis   -IDTCVQLIELERDPECLKEVFDLIKLVS-------QKNEIDADSAPLLFDCASAYFPILYPPKGDEA----LRIDLTNKIL
MMS19_naeGru   FLNGFIQSLEGERDPGNLLYCFNLIPKVIAIFDDSELSSKILSAVSDDLFDITSCYFPITYTPPANDTRG-ITREDLSRSLK
MMS19_phyInf   LAQTFLSAMEGEKDPRNLLLCMQVARTLLSKLE---PVFSRSDTLLQQYFDVVSCYFPIIFTPPPNDPYG-ITSEGLILSLR
MMS19_albLai   FIRSFLNAMTGEKDPRNLKHCFQIAQTMMQKLE---MVFQEAE-LSEQYFRVISCYFPITFTPPPNDPYG-VTTEELIRSLR
Consensus      f  g  q  dgEkDPrnL   f                          lF#v sCYFPI ftpp ndp   it edl   lr
Summary of MMS19 reference sequences:

MMS19_homSap Homo sapiens mammal Q96T76 1030 aa 7 HEAT 100%
MMS19_musMus Mus musculus mammal Q9D071 1031 aa 9 HEAT 89%
MMS19_cioInt Ciona intestinalis urochordate XP_002128657 1026 aa x HEAT 32%
MMS19_braFlo Branchiostoma floridae cephalochordate XP_002588594 1027 aa x HEAT 42%
MMS19_strPur Strongylocentrotus purpuratus echinoderm XP_001194909 975 aa x HEAT 36%
MMS19_sacKow Saccoglossus kowalevskii hemichordate XP_002735310 1007 aa x HEAT 40%
MMS19_dapPul Daphnia pulex crustacean EFX86854 961 aa x HEAT 38%
MMS19_droMel Drosophila melanogaster insect NP_649519 959 aa x HEAT 30%
MMS19_nemVec Nematostella vectensis cnidarian XM_001629116 897 aa x HEAT 32%
MMS19_triAdh Trichoplax adhaerens single-celled metazoan XP_002114595 959 aa x HEAT 39%
MMS19_sacCer Saccharomyces cerevisiae budding yeast P40469 MET18 1032 aa 13 HEAT 29%
MMS19_schPom Schizosaccharomyces pombe fission yeast Q9UTR1 1018 aa 14 HEAT 25%
MMS19_araTha Arabidopsis thaliana plant NM_124186 1134 aa x HEAT 28% armadillo/beta-catenin-like
MMS19_dicDis Dictyostelium discoideum slime mold Q54J88 1115 aa 18 HEAT 31%
MMS19_pytUlt Pythium ultimum stramenopiles ADOS01001616 957 aa 31%
MMS19_sapPar Saprolegnia parasitica stramenopiles ADCG01000470 804 aa 31%
MMS19_polPal Polysphondylium pallidum amoeba EFA86574 994 aa x HEAT 28%
MMS19_entHis Entamoeba histolytica amoeba XP_651925 868 aa x HEAT 25%
MMS19_naeGru Naegleria gruberi early eukaryote: heterolobosea XP_002678884 1070 aa x HEAT 27%
MMS19_phyInf Phytophthora infestans early eukaryote: stramenopiles 1114 aa x HEAT 33%
MMS19_albLai Albugo laibachii early eukaryote: stramenopiles 1077 aa x HEAT 27%
>MMS19_homSap Homo sapiens mammal Q96T76 1030 aa 7 HEAT 100%
MAAAAAVEAAAPMGALWGLVHDFVVGQQEGPADQVAADVKSGNYTVLQVVEALGSSLENPEPRTRARAIQLLSQVLLHCHTLLLEKEVVHLILFYENRLK
DHHLVIPSVLQGLKALSLCVALPPGLAVSVLKAIFQEVHVQSLPQVDRHTVYNIITNFMRTREEELKSLGADFTFGFIQVMDGEKDPRNLLVAFRIVHDL
ISRDYSLGPFVEELFEVTSCYFPIDFTPPPNDPHGIQREDLILSLRAVLASTPRFAEFLLPLLIEKVDSEVLSAKLDSLQTLNACCAVYGQKELKDFLPS
LWASIRREVFQTASERVEAEGLAALHSLTACLSRSVLRADAEDLLDSFLSNILQDCRHHLCEPDMKLVWPSAKLLQAAAGASARACDSVTSNVLPLLLEQ
FHKHSQSSQRRTILEMLLGFLKLQQKWSYEDKDQRPLNGFKDQLCSLVFMALTDPSTQLQLVGIRTLTVLGAQPDLLSYEDLELAVGHLYRLSFLKEDSQ
SCRVAALEASGTLAALYPVAFSSHLVPKLAEELRVGESNLTNGDEPTQCSRHLCCLQALSAVSTHPSIVKETLPLLLQHLWQVNRGNMVAQSSDVIAVCQ
SLRQMAEKCQQDPESCWYFHQTAIPCLLALAVQASMPEKEPSVLRKVLLEDEVLAAMVSVIGTATTHLSPELAAQSVTHIVPLFLDGNVSFLPENSFPSR
FQPFQDGSSGQRRLIALLMAFVCSLPRNVEIPQLNQLMRELLELSCCHSCPFSSTAAAKCFAGLLNKHPAGQQLDEFLQLAVDKVEAGLGSGPCRSQAFT
LLLWVTKALVLRYHPLSSCLTARLMGLLSDPELGPAAADGFSLLMSDCTDVLTRAGHAEVRIMFRQRFFTDNVPALVQGFHAAPQDVKPNYLKGLSHVLN
RLPKPVLLPELPTLLSLLLEALSCPDCVVQLSTLSCLQPLLLEAPQVMSLHVDTLVTKFLNLSSSPSMAVRIAALQCMHALTRLPTPVLLPYKPQVIRAL
AKPLDDKKRLVRKEAVSARGEWFLLGSPGS*

>MMS19_musMus Mus musculus mammal Q9D071 1031 aa 9 HEAT 89%
MAAATGLEEAVAPMGALCGLVQDFVMGQQEGPADQVAADVKSGGYTVLQVVEALGSSLENAEPRTRARGAQLLSQVLLQCHSLLSEKEVVHLILFYENRL
KDHHLVVPSVLQGLRALSMSVALPPGLAVSVLKAIFQEVHVQSLLQVDRHTVFSIITNFMRSREEELKGLGADFTFGFIQVMDGEKDPRNLLLAFRIVHD
LISKDYSLGPFVEELFEVTSCYFPIDFTPPPNDPYGIQREDLILSLRAVLASTPRFAEFLLPLLIEKVDSEILSAKLDSLQTLNACCAVYGQKELKDFLP
SLWASIRREVFQTASERVEAEGLAALHSLTACLSCSVLRADAEDLLGSFLSNILQDCRHHLCEPDMKLVWPSAKLLQAAAGASARACEHLTSNVLPLLLE
QFHKHSQSNQRRTILEMILGFLKLQQKWSYEDRDERPLSSFKDQLCSLVFMALTDPSTQLQLVGIRTLTVLGAQPGLLSAEDLELAVGHLYRLTFLEEDS
QSCRVAALEASGTLATLYPGAFSRHLLPKLAEELHKGESDVARADGPTKCSRHFRCLQALSAVSTHPSIVKETLPLLLQHLCQANKGNMVTESSEVVAVC
QSLQQVAEKCQQDPESYWYFHKTAVPCLFALAVQASMPEKESSVLRKVLLEDEVLAALASVIGTATTHLSPELAAQSVTCIVPLFLDGNTSFLPENSFPD
QFQPFQDGSSGQRRLVALLTAFVCSLPRNVEIPQLNRLMRELLKQSCGHSCPFSSTAATKCFAGLLNKQPPGQQLEEFLQLAVGTVEAGLASESSRDQAF
TLLLWVTKALVLRYHPLSACLTTRLMGLLSDPELGCAAADGFSLLMSDCTDVLTRAGHADVRIMFRQRFFTDNVPALVQGFHAAPQDVKPNYLKGLSHVL
NRLPKPVLLPELPTLLSLLLEALSCPDSVVQLSTLSCLQPLLLEAPQIMSLHVDTLVTKFLNLSSSYSMAVRIAALQCMHALTRLPTSVLLPYKSQVIRA
LAKPLDDKKRLVRKEAVSARGEWFLLGSPGS*

>MMS19_cioInt Ciona intestinalis urochordate XP_002128657 1026 aa x HEAT 32%
MEKVKFEMEEMIQLWLRDKNDDHKILKCAQQIENREQTIGDLVTALGPHLTNKDTKIRIDACTLLSNVIHKLPKDCLNQGELESLVQFLCSRLEDHYTLQ
PVALSLLLQLSSADNLTGENACSIITSVFKEVHIQTCMQHDRLKIFQILGTLLDIHTKDVITMGRDFLYQYIQVIDGEQDPRNLLTIFQLTKNLIESSFP
LFDLVEELFDVSSCYFPIDFNPAAAGKKSTITNLDLVSSLRGVLASTKQFAQYCIPLMLEKLESDVESAKIDSLETLTACLGCYGKQELEKYLSSLWSDV
KREINQSSSEQIEKCCLTFLTSLLSNLSSWPVDQKSEKATDLKSFLDDVLEDCVPRLQAQSDDRSKWMAGHVVLACAKSSKKACSQIVTTVLPILLQNAQ
SKSASTTLAGQSVQQSALDNLVKLTAVCGQFNFENHPVLKKKEEFFTILNELALKSEIEEQLKCIAVAGFASLLKLEILSNVELTEIASLLLKMIKLKPE
SHLRGEVLSVAGYLSSQHPDVAKSHLIPCVMRRMEEGDDSCFDVLASVCTHFDVLKLVLGFIMERIVNTQVDETSEPLLHACLESLQKMTSSSWVGNTEI
EYMALNLVLPLLKRCIEVTLELSVPEQCCANCHIFEDVSKECASLPILKSAAIVIRNVCQKLKPGKSTDLVIQLIASLYNNSKLSSLDIKSDVHFTPFHP
KASPLQTRTLCFLPATICALHPNIEIPELAELETKLLNTCLHCTDQPSYVFAAKALSGLVNKYKKPSIPILEKLKSHFDTDPNWSLKSEEEKMMILTLLI
WICKALVLSNHPDSLIFIKNLLYWMGDDSVGEVAAAGFDIILRESNEVLSPSSHSTIRLMHKQRFFLLIIPEIVSSFKTSENKTQQTNILTALSHLIGHL
PKQVLMQHFTELLPLLTQALHTDNTQLLKSVLSTLFCFIQDTTEAMTAHLENLMKHFLRLSKFKQDIDVRVKAVQCIGVVTLLPPIVILPFKNDIVRHLV
SVLDDRKRDVRTEASKARSEWFLVGT*

>MMS19_braFlo Branchiostoma floridae cephalochordate XP_002588594 1027 aa x HEAT 42%
MAALSGNVQENVLEFVQGQQDSALQSVAKAVFDGETSLLQLVESLGSSLTSTEVTTRARATQLLAEVLHRSPSNRLTEKEAEVLSAFFCDRLLDHHSVQP
HVLHGLLALSAAPQLPQGEEVKIVQVIFKEVYVQSLVQTDRRAIYNILANFLDTRLEALQALGADFVWGFIQAMDGEKDPRNLIIAFSIARIVAQAFPIG
TFTEELFEVISCYFPIDFTPPADDPHGVTREDLVLGLRQVLAATSKFAQFCVPMLLEKLSSDVTSAKLDSLHTLAACAEVYGADSMKSFLDLLLSAISKE
VYSSIHQDVENAALAGLTAVVATLSHAVTETRSVFSLHHFLDSLLKGCKHHLCEPELKLMWPSAKLLQAAARASDPACVHVLDTAVPLLVEQFQVHPYPQ
HRHTILEVTIAFIHVAHASTSGTDAPNPVVPHSDNFLTLFYSVLEDADAGLRSSGVGGMAAMIGITDVVKGKHLDLCANHLGRLVLHDADPTVQRRSTEA
LAAMATAHPDVVREEVLSKLLQVLENNNPNAMDTNQSEQVCAKHVTNQYVLNTLAAVSTHPTIVRCTIPKLLSHLQALIESCPDQATQEAIATLDCVYKV
VEKTVINDANVEYFVDTIVLNLMSMALSAAVNTSDENLLHDTSLLEIVAKVLRAVARSLPNSTGKGIVNSTVQAFLQGNLAAISLNTSASFEPLDVSSPW
QQTQTVQLLSAIVCSVARNVDIPSISELAQKLLTLSCASDHEPTSLAAAKSLSGVVNKWDQGEQLQTFLQETRDCLEQILSKTEDEKARCRAVAVLVWLT
KALVIRGHPSGSQFTKTLMALFEDEAIGRRAAEGFYVILSDSPDVLSKESHANIRLMYKQRFFMENLPALVDGFNQADDGRKQSFLCAVSHLLTFIPRQV
LLGALPPLVPLLVQSLLGEDPSLQVSTLEMFSSLVQEAPQVISKNIDALIPQLLELSKNGPTMKVRMAALKSVGSMTSLPHAVVYPYRNRVVRELAVAVG
DKKRMVRKEAVAARGEWFLLGSPGGK*

>MMS19_strPur Strongylocentrotus purpuratus echinoderm XP_001194909 975 aa x HEAT 36%
MGTYLMSTETRIRAKGVELMSEVLTSLPRAFLNQQQIQVLIEFLCARLLDHHSITQHTLKGLLAMSSQSSFPPSSSVQVMTAIFKEVQVQTMLQVDRRTV
YNIVVNLLRISLTELQGMGSEFVLGLLHAMDGEKDPRNLILLFNILPTVINNFKIDMFIEETFEVVACYYPVDFHPPPNDPYGISREKLALSLKTCLSST
PKFAQFCLPMVMEKLSSDLQTARLDSYQLLQACAPVYSQGDMMSYIEAIWSYCRKELMVGASVELDQEAVKTLGAVVKAVSTGIQSTSGGGGGDGDLNSF
LRNILTECRQHLCKPDHRMIHPCSKLLVAVATASYPACIAILKYSVPILLDQFHIFDQTRERMVLLDIIQRLLHSGHDHIKEADDWRAIYAHHLDTVVTT
VLSTLAKDQGVPDLRMAGLGTLGELVQVPVLMDQSRLELVGQELTRILLEEANEDVRCECIETVSCFASRHTEFVKSTILTTLWTTVQKGESGYQRIVVD
MATIVTDTSDDLSRSLTSELMVEIAKTELNSEQHLVYLATLNTLTAHLSSAPSNLESLLSSVVHPLMKMVVSATLQSSVEAGNNPHCCGEVLVAMAEVFR
TVIPKLDSSMGSKLCQCAVDVFLHGNLTSLELTNPNTSVPFSPLDPRAPVHQTQLVTVLQPIVCSLRRDIHIPSSKQLMSSLLHIAAHSRAWLASTWAAK
GLAGGVNKHPAGSDLDEVLVEAESLLGQAMSSGQEGSVKQQALMAWVLLTKALVMRSHPKATAFLTTLLRLLEDAELGAQVPQTLGMLLEDMRDVLSEGL
HADVKIMYKQRVFLQALPFVMALFNKDDLRTKAITALCHLLPSIPRPVLLAELPPIIPRLVQSLRVTDPRPTLPILDILESLLEETLPSLVDQADTLLPT
LLELSAYQASMKVRIASLKCVGAITSFPHHLVYPHQETVVRSLAPRLDDKKRLVRQEAGKARTKWILLQQDTKG*

>MMS19_sacKow Saccoglossus kowalevskii hemichordate XP_002735310 1007 aa x HEAT 40%
MATSMCIEIVENYVRGEDESAIHAAEIKILELVENLGTYLTSTEKNIRCRGTRLLSEVLNRLPKNFLSSDEVRALVIFYCDRLSDHYSVTPHTLLGMLAL
STYDNLPKGCEVQLVQAIYKEVHVQSMIQVDRRSVYAILSNLLDTRIKDLQSLGRDFVFGYIQCMDGEKDPRNLTMIFRCVPIIIHNFPIDVFIEELFEV
VSCYFPIDFTPPPNDPYKVTQEELVLGLRKCLAATPKFAEHCLPLLMEKLSSDVQRAKIDSFLTLAECCEVYGEDDLMEFLPAMWSTIRREVFQAFSHEV
EKSALTCLCSIVKTLSNAVSNANKAAGGLDEFLDLVLKDCSKHLRDPGLRLMLPTSKLLQSAASASDPACYKIISAVVPILLEQFHKCKQVNERVSLLHA
ALDFIKVCKSFTFGDDTPSPVIPFKDSLASLFLSLLSDHSSQLRCIGITGLVGLMSLNAIMNINEKKLAAMHFTNIVLTDQDNKVCSEAVTALAFMSMEF
SLLVKEEVLPQLIKELDSRATGTRHRFIVNTLAGISMHSDIVLTTIPVMLQHLGTLSEDNTAESLETAVNTIQSIDIVVNSNISDEQCLDFFHSKLLPQL
LRITVDQALQVNNYILCKEDVVSSIATVCRNIAKVLDDRVASNLVSNTISLFLDGNLENIGLKQSSQHFRPLEISSPWQHTQLVSLLTSIICSMKTFELS
SQCLELMEKLLKLSLSSEHHLTCVSAAKCYAGLVNKHKQGTDLDSSLETVVESTCRMLQDEISDQNIYNRQKALTLWLWVTKALVLRAHFKSTQFTTKLI
SLFEDHQLSQMAADGFYIILSESQDVLNKDMHCDIKLMYRQRLFMQTLPRILAGFEKANEDKKQYYLSALSHLLQFIPKQVLLSELPPLMPMLVQSLYCQ
DVGLYVSTSDTLSMLIQDAPTVISLYVDTLLPQLLTLSTYQQSMKVRIAALKCIGLFVTLPTHVIYPRQKEVVRRLASVLDDRKRLVRQQAVTARGLWFL
LEAPKK*

>MMS19_dapPul Daphnia pulex crustacean EFX86854 961 aa x HEAT 38%
MAISTAIQKLRDSFNSEESANESIRCISQSIASKELTILKLVEDLQPDLLNQQNTHRCKAVSTIGTILEQLGPELKGLNEKEVELVTEFFCSKLKDHHSI
LPAALQGLHALSTAPKLSPGLARLISQSIFQDVHCQSQLQHDRRAIYKTLKNLLAFHLKELQDLGQDFVFGLIQLADQERDPRNLLILFSIFPVVARYFR
FEPFTEEFFEVFSCYFPIDFTPPANDPYAVTKEQLCDGLRQCLAGSPHFAEYCLPLLQEKLESDLVSAKVEALKTLELCCQTYQAGQLEKWVDSFWTGIR
REVLINVNTDDLEHASLDALAALSRAFTTDGEFNSPAFTKLLKNVLTECQGHLCEPERRLMTPSSYILLAICSGSAPACALIVSQVIPLLMDQYRIRPQS
NPRQFILNSLNKMVHAGLYGFTEENVAQSGLASLIPKLLELYLEVLKEDDAVLRNLSLQGLSHLIGTCLNHQDLEKVNGTLLDLLQKSTATDSVIAEIGH
FFCKSAEKNENLFLEQVLVKLLDIAVSGSIPTDGCARTIRPGITTGSTQSFDSFRTKGRTRNIPAIAPLGIENIGRRRSSGVTPSHLCLIEKSGFQFIFR
VILLDQNVGRNVFVTFSALYRKATEFINEQTEQYVSQHLARSPWTLSIMEATLGSLDATPSGHSLERLVNTLEPLTVCHPKADVRLSACRLMAALVNKLP
EGHELEAILDSLRRKWQDPSTDRCNSVCLFVWITKALLMRSYSKLNQYIQELVDSLNDPTHGYQVAEGFKTILCDTEECLNFNCHANIRLMYRQRFFQEV
VPRLLKLYRESESCNKAACFAAIANQLAFIPEGVLIAHITTLIPLLIQCLSTDQPAQLIISTINAFMGLMSDNVSAIEEYISSLVPRLLTLAKDGITMDV
RRLALQCLSELRKAQSIVLLPLRSEVILRLVPCLSDKKRLVRREAALARQKWIMLGQPGCN*

>MMS19_droMel Drosophila melanogaster insect NP_649519 959 aa x HEAT 30%
MTTPTRATLEKALKSDQKLVNSATQIAKDLTAKAYDISALAEALGFALSSPDMEERVAGTNLLSAVLIALPQDLLQERQLEFLSTFYMDRLRDHHNVMPA
IIDGIDALVHMKALPRAQIPQILQSFFEHTTCQSQTRSDRTKLFHIFQYLTENFQDELQAMAGDFVYGLINSIDGERDPRNLDIIFSFMPEFLSTYPLLH
LAEEMFEIFACYFPIDFNPSKQDPAAITRDELSKKLTNCLVANNEFAEGTVVLAIEKLESELLVAKLDSIELLHQAAVKFPPSVLEPHFDQIWQALKTET
FPGNDNEEILKASLKALSALLERAAHIPDISHSYQSSILGVILPHLSDVNQRLFHPATGIALVCVSGDAPYAADKILNSFLLKLQAADASSEQRIKIYYI
VSQVYKLSALRGSLQKLDTTIRESVQDDVIASLRLIEQEEFDAKKEDLELQKAALSVLNESAPLLNEKQRALIYKALVQLVSHPSIDIDFTTLTVSLGAL
QPVEVQSNFIDVCVRNFEIFSTFVKRKIYTNLLPLMPQIAFTQRILDLVMTQTFNDTTAEPVRLLALEALNKLLLLADQRFIVDVQQESNLLHKLIELGQ
KTEGLSMQSLEQIAGALSRITQQLPLSEQSAIVSEYLPGLNLSQSADLYITKGLLGYLHKDITLDDHFERLLTDLTQLSLNSDNEQLRVIAHHLLCSMVN
KMESNPANLRKVKKITEQLKVAIKKGDVRAVEILAWVGKGLVVAGFDEAADVVGDLSDLLKHPSLSTAAALGFDIIAAEYPELDLPVVKFLYKQKLFHTI
MGKMGSKLANYCVHHLKAFVYVLKATPQAVIKLNIEQLGPLLFKSLEEHNEAQSLCIALGICEKFVAQQDTYFQGHLAHLIPSCLELSKYKAQHTMQVRI
AALQLLYDVTKYPTFVLLPHKVDVTLALAAALDDPKRLVRNTAVKARNAWYLVGAPSPN*

>MMS19_nemVec Nematostella vectensis cnidarian XM_001629116 897 aa x HEAT 32%
MAALGQEEYPSLATLLQDVYQRRKNLLQVVELLGPSLTSTDTDKRCSAVQLLSSLLQKLVNYKLTDREDLKPVGSDLVFGFLQAMDGEKDPRNLVVAFKL
ARIIIKNFPIGLFAEDLFEVTSCYFPIDFTPFCLPLLMEKLSSDVINAKIDSLLTLVFQTVSSELEDAAFKALSSIIKNLESSSPGQEPFLSRIFINFYT
ISCYVTQCHPDVVEFKTPFLDCVIKECCANIEGADLRKVKPSGQLLQAAFVTDTTYNEITSTAVPLILSKYNDEATQGLVKKLLLDVLLGLLTASKPYYK
RKGSVLASHTSALVDVLFSALVSDSPSLCRAAIAGLVSMVTLPGLLLEQKVGMFVEHLTSFVLNTKDLTVRQESNAALAFLAMEFPELIKTKLVSVLAEQ
LQKEDGSAMDEENISHLQSDKSHPQYDQMLNTLSAVCTEEGVVRHVVPIILDHGEYLVTGKDLERGVLHGKISETLKCLNSIVKGTLQSSTVEPNYYTEV
VIYRIIDLCTQSALQESPDCPMATPEALALVCSIVRQVISHLAVNEAEDVLHIIVSNFIEGKTPLSARAEQKFAPLEPSSPWQQSQLVTVLMAAVCSARR
EVRIPRQKELVPRLQVLASGCNHRKTTVAASKCLGGIINKMAQGDDLTADLHSLKGQLQNHMDGNEEQRWRAVITWLWLTRALVTRSHPMAQEFVQKVLH
LLDDVSVGRVAADGFYVIVSDCDDVMNQAMHADIKMMYKQRFFMETLPLLLKGFHDTRPECKYLYLCALSHLLQWIPKQVLLTEIPTLMPMLIQALSRDE
PSLLLSTLQTLYSLVFDAPEVISRQVTSLIPNFLELAKCKASMKVRMEAIKCLGAMTTLEHHVVYVYKARVIKELACTLDDPKRLVRAEAVKCRNEW*

>MMS19_triAdh Trichoplax adhaerens single-celled metazoan XP_002114595 959 aa x HEAT 39%
MEKDSSAKSLQQLMDEFILGNSSAINEIIKGIYDGHIKLSTIVELLGPYLTSVEHEKRLQGMKLLSEVLQMLSMYKMQATEVQLLVAFYSDRLQDHFSIL
PETLRGILALVQHQIISEEDAVTIVKGIFKEVQNQALLQADRNKVYAILAGLLDKHYEGIKIMDADFVFGYIQVMDGEKDPRNLLLALKIAKFIVQNFNI
DLFLDDFFEIISCYFPIDFTPPPNLPSNENVTKEDLIIVLRESLTSTRKFAGISCAKIYTATDFQEYLQPIWTAIRQEVFLSMDDQVQELSLEALKHVVV
TISSNSLQQPDQDPLNDFINMIVTETQQYLQDPELKLANPCGNVLNAVASASDRSCYSILTPIIPRLVNLYSTDKTVIFRCKVLDILIKLLNAAANCQLS
EQFIAPMDWHEIVKLLQLAMDTSEEDIRLRVTASFSILIQIKDALPADEIERISNDILKRALEDPSSIVRHGSISTLATIASVLPDVIITTVIPYIRTSV
TNLQLLLQCLANVKNRIENCLYLYHYLFDDILWLCVYNSLEESINSFEFKTIKIIASIGQLIYLNLDESSQKKFIDNLLELFMNGQVSVLKPMTVIDELP
LKQFYPLNVASSQRQVQLIEILCKILGAIKFRDGILSPNDMITNLLDISCKSVHQPSATSAAQLLSSIINKMEEGDQLENYIKSITNTICNVLYSKNVET
EMKNAVNTWIWMFAILCRYSCSLFHYSNFDIKTSFDASFQLMKALIMRSHPYSNEALIQVLKFFKLPNVGHVASAGFKIIIGDEENILCESTNAIVKFMY
KNRFFMMASEKLMENYRIASKGIKHHYLTALSHLLNGVPKQMLLNHLQMLMPLLVESVSCDEESLRLSSLQTLRPLITEAPDIISNYVASMLPELLKLCN
FPSSMKIRISALQSVNDLASLPIHLVVPYKSKVINELGNTVNDKKRLVFTVINPKKQQ*

>MMS19_sacCer Saccharomyces cerevisiae budding yeast P40469 MET18 1032 aa 13 HEAT 29%
MTPDELNSAVVTFMANLNIDDSKANETASTVTDSIVHRSIKLLEVVVALKDYFLSENEVERKKALTCLTTILAKTPKDHLSKNECSVIFQFYQSKLDDQA
LAKEVLEGFAALAPMKYVSINEIAQLLRLLLDNYQQGQHLASTRLWPFKILRKIFDRFFVNGSSTEQVKRINDLFIETFLHVANGEKDPRNLLLSFALNK
SITSSLQNVENFKEDLFDVLFCYFPITFKPPKHDPYKISNQDLKTALRSAITATPLFAEDAYSNLLDKLTASSPVVKNDTLLTLLECVRKFGGSSILENW
TLLWNALKFEIMQNSEGNENTLLNPYNKDQQSDDVGQYTNYDACLKIINLMALQLYNFDKVSFEKFFTHVLDELKPNFKYEKDLKQTCQILSAIGSGNVE
IFNKVISSTFPLFLINTSEVAKLKLLIMNFSFFVDSYIDLFGRTSKESLGTPVPNNKMAEYKDEIIMILSMALTRSSKAEVTIRTLSVIQFTKMIKMKGF
LTPEEVSLIIQYFTEEILTDNNKNIYYACLEGLKTISEIYEDLVFEISLKKLLDLLPDCFEEKIRVNDEENIHIETILKIILDFTTSRHILVKESITFLA
TKLNRVAKISKSREYCFLLISTIYSLFNNNNQNENVLNEEDALALKNAIEPKLFEIITQESAIVSDNYNLTLLSNVLFFTNLKIPQAAHQEELDRYNELF
ISEGKIRILDTPNVLAISYAKILSALNKNCQFPQKFTVLFGTVQLLKKHAPRMTETEKLGYLELLLVLSNKFVSEKDVIGLFDWKDLSVINLEVMVWLTK
GLIMQNSLESSEIAKKFIDLLSNEEIGSLVSKLFEVFVMDISSLKKFKGISWNNNVKILYKQKFFGDIFQTLVSNYKNTVDMTIKCNYLTALSLVLKHTP
SQSVGPFINDLFPLLLQALDMPDPEVRVSALETLKDTTDKHHTLITEHVSTIVPLLLSLSLPHKYNSVSVRLIALQLLEMITTVVPLNYCLSYQDDVLSA
LIPVLSDKKRIIRKQCVDTRQVYYELGQIPFE*

>MMS19_schPom Schizosaccharomyces pombe fission yeast Q9UTR1 1018 aa 14 HEAT 25%
MSSNLVALYLFSIDRSQDEANDVVDRIVEEIVTDRMGIVDLVTSIGEYLTDNNISVRAKAVLLLSQTLGELPKDRLPAKHVSVLLQFYLSRLDDEVTMKE
NALGIGALLNMQNFPAQKIVDVCKALFSSTDMPKYAQATRLNILKVFETIIDNYLFFISSQTRDAFFSGICSTFAGEKDPRNLMLVFSMLKKILSTFPID
GFEQQFFDITYCYFPITFRAPPDATNLAITSDDLKIALRETLVANDAFSKLLLPALFERLKASTVRIKIDALNIYIEACKTWRVGAYLWSAKDFWESIKQ
EILNSTDAELQNLALGALNTLASKFYKEEGFSSSFTEFVDMILIQLSQRLLEDVNVKSCGSCAAVFASLASISVETFNYCSCNFLPSVLDLPMVNEPLEK
QKGMLVFLEYVYKCLVLLYGKWRSKNQADIDNPLLVYKDKQLSFVSGSLMGTAKDETEIRMLALKVIFLMASIKNFLTESELTMVLQFLDDIAFDFSDPI
KKKATECLKDLGLLKPDFLLLTSFPFAFSKLTDDVTAKSSSEETFKQYLSVLVSISEERSLFKALVIRLVEMLKDQFKSKEMSVDLVESIVQSLSVAFKE
RNDRNEQEIPFFFEELLKQLFTLCFANCESMNVRCLIYVSQTINEIVRVNHFEFQEKFVGQLWKLYMENSNSDLIETEGCEKAAERFTLAASLSDQKFLN
LVVLLQGGLNGLSKKLHFIEKLNIELLNLLINVVFVTESPGVKISALRLISSLINKCEKDEDISSFISSKGVTSLWDKVYTGTPKESEAALDVLAWVDKA
LVSRKHSEGIPLAFKLLDTLNLQNVGDSSVKALSIIIKDDPALSKENSYVEKLLYKQRFYASVSPKILEHISTATGGEKSLYLMLLSNVIGNVPKEIVIP
DMPSILPLLLQCLSLSDISVKLSTLNVIHTSVKELTSLLTEYLDTLIPSLLAIPKDMNNPTVVRLLALKCLGSLPEFTPTTNLQLFRDKVIRGLIPCLDD
PKRVVRTEASRTRHKWYI*

>MMS19_araTha Arabidopsis thaliana plant NM_124186 1134 aa x HEAT 28% armadillo/beta-catenin-like
MMVEPNQLVQHLETFVDTNRSSSQQDDSLKAIASSLENDSLSITQLVREMEMYLTTTDNLVRARGILLLAEILDCLKAKPLNDTIVHTLVGFFSEKLADW
RAMCGALVGCLALLKRKDVAGVVTDIDVQAMAKSMIQNVQVQALALHERKLAFELLECLLQQHSEAILTMGDLLVYAMCEAIDGEKDPQCLMIVFHLVEL
LAPLFPSPSGPLASDASDLFEVIGCYFPLHFTHTKDDEANIRREDLSRGLLLAISSTPFFEPYAIPLLLEKLSSSLPVAKVDSLKCLKDCALKYGVDRMK
KHYGALWSALKDTFYSSTGTHLSFAIESLTSPGFEMNEIHRDAVSLLQRLVKQDISFLGFVVDDTRINTVFDTIYRYPQYKEMPDPSKLEVLVISQILSV
SAKASVQSCNIIFEAIFFRLMNTLGIVEKTSTGDVVQNGNSTVSTRLYHGGLHLCIELLAASKDLILGFEECSPTSGCANSGCSMVKSFSVPLIQVFTSA
VCRSNDDSVVDVYLGVKGLLTMGMFRGGSSPVSRTEFENILVTLTSIITAKSGKTVVWELALKALVCIGSFIDRYHESDKAMSYMSIVVDNLVSLACSSH
CGLPYQMILEATSEVCSTGPKYVEKMVQGLEEAFCSSLSDFYVNGNFESIDNCSQLLKCLTNKLLPRVAEIDGLEQLLVHFAISMWKQIEFCGVFSCDFN
GREFVEAAMTTMRQVVGIALVDSQNSIIQKAYSVVSSCTLPAMESIPLTFVALEGLQRDLSSRDELILSLFASVIIAASPSASIPDAKSLIHLLLVTLLK
GYIPAAQALGSMVNKLGSGSGGTNTSRDCSLEEACAIIFHADFASGKKISSNGSAKIIVGSETTMSKICLGYCGSLDLQTRAITGLAWIGKGLLMRGNER
VNEIALVLVECLKSNNCSGHALHPSAMKHAADAFSIIMSDSEVCLNRKFHAVIRPLYKQRCFSTIVPILESLIMNSQTSLSRTMLHVALAHVISNVPVTV
ILDNTKKLQPLILEGLSVLSLDSVEKETLFSLLLVLSGTLTDTKGQQSASDNAHIIIECLIKLTSYPHLMVVRETSIQCLVALLELPHRRIYPFRREVLQ
AIEKSLDDPKRKVREEAIRCRQAWASITSGSNIF*

>MMS19_dicDis Dictyostelium discoideum slime mold Q54J88 1115 aa 18 HEAT 31%
MTSNITELNKWIEGYVNPQSEESVKTNAINMVLLYMKSNKIDLQDVVQGLGDYLKSNDSILRARGTLLLSEVLCRLPDLPLNQDQVHFLAMFYCDRLQDY
ACSSEVVKGITGLITNHTPDYPDNQKLLRNIFSEVHPTSLTQAHRKMVLQVIDIMFNKCLSEIQELKNDFMVGYLQFIDNEKDPRNLIFSFKLLPKVIYN
IPEHKHFLESLFEIISCYFPISFNPKGNDPNSITKDDLSNSLLNCFSCTPLLAEHSIPFLIDKICSNLIETKIEALQTLVYCCDRYGGFAVQPFLEEIWS
TLRTLILTHKNTTVIEESKKTIFYLTRSFTKERKVLESFLSIMIKECLHHIKSSQDSKIAIYCASILYQSVSASLLSSKIILIHIFPNLFNFLSELQKQD
TVQKVNEQNSVIALFNDLLKANSIAFEMYSNENKEPNPLEPFVDQLFKLFSDLLLLNSSSSIRSNSIECLSNLYISKKVHTTEQDDDDSEQITNEFLLDL
EKRQFIIKSLVSLLNSSDNTLRHKSLDSLFTIASNEDPSVLNLYVIPTLLQMINHSSCNINTTNNKINNNNNNNNIVIKNNKCQDEHCNEDHSNKNENNN
NSNENSNGNSTSGSDDDLKHYLEAFTKLCTHQPLLESVIPQIQVLLQHNIKETYQSNEDFEKSILILQSISFILEKSTNIKSMTICSKSILFPLIKGLYK
QELISSSNDNNNNNNNNSNRFNQILTPTLKMIHSIFENISIESQKPLLEKLIKLFLNGDTLVINYQLPTTTTTIIKPFEKSSPYKYLIPIFTTIISQSKL
DLSENNELKQSLYQMSLDVNVDDSIAISCSKAYSSIINKQQQQQQQDQINFNFFNDNLLKVINDTTTPLPLKIRHLDLFTWCTKALLTNGNSINIKLGSC
LADIISNENVELSYHASKSFGILLSETDVLNEKSGSIIKILFEQKFFTLMFPILLESFKVSKNKELQTISSHYLIAISNLLKHVPKEILLAELNEILPIV
MQSLKSSDNNDQVQLLDSSLQTLTMLINETPSSFISYLDSLIPSLIKISTKSTKYNLKRSALEILTLLSKSIPFVNLFPYKTQVVTDIIPCLDDKKRIVR
REAQKCRNSWYILQK*

>MMS19_pytUlt Pythium ultimum stramenopiles ADOS01001616 957 aa 4 ARM units 31%
MFSLDAPLAPAIDAFVNPENDDNVHKTSLNTVVMQVHRKVSMEALIQALGLHLTSTDDKVRARAMQLLAEVLSRLPELPLTPNAVQLLVDFFADRLADYP
SASACLQALLALESNHAKKIASPTVTIILIQKMVKVLHVPQLGQAMRKQCFELMQLALGQKVVVDVLVTAPESSSIDHGLLFAQAFLNAMEGEKDPRNLL
LCLQIARELLAKLEVVFDRHDAVLQQYFDVVSCYFPITFTPPPNDPYGITSEELILSLRKAFAASDLLAKHVLPFLLEKLSSTVVEAKLDSLQTLVFCCE
AYSINVALLHMLSIANALYHEVVKGEKKEVIEASLRAISRFSSVIGLAKTKAAGGAAYAWNKFVVELTTRAMSDLTGHATDSLVSVSAGQVLAALGKDSV
LGFTHVLETSVPLLIQQFNESSTSTESKCEASLARLLLIVNTIDREVDQSASAQPMRPHALVLIDALVAFLSNNEALSTPTAKCSAIEALSHLVTYPPSP
IVEIAQVKALVELFINFLLFDASPEVRRECLQSLRAISTIKQKATVKNYASLVMEIALTQLMDAVQLSAQNTKVAAVLASSGRDHPEFFNDVLDSITQLS
QEASLFQATIVRLVDFCVVENQDSNKITFVANSSANGTQAHVDGILNAVAKIVELNADDKASMEFCVTSGGDNSIVFRLLKAVTTTAADAAAQNALLDDA
KLASCARIFRTPMQNVSTETQQLLANAAISAFLTTQSTGASASHPAYLQLVPLFSAVINSANRNLNLPETSRVINTLLELAQSSTAVYHTTASTQQIEQI
SSEAALSAAKSLASIVNKMSDGEEFDALIVLLLDQKLSQIIANEQKDVSVRVAALQIYVWIAKALVIRGHREHAPACLFFLCKFLTPETSDARSQIAMHV
AKSFKLLVTEFPDVLNRKCGAFITVRQHKKKYAGILGNADLTFYFVCVVPVPSANV*

>MMS19_sapPar Saprolegnia parasitica stramenopiles ADCG01000470 804 aa 1 large ARM repeat 31%
MFSLDAPLQPAIDGFVDPENGEQQHTTHLNNVVMSVHRKTPIEQVIQGLGAHLTHVQDKRRARATLLLAEVLTRLPDLRLSSDTAHLLLTFFLERLKDGP
SMAACLKALVALISLHAALLPANDAWTVCATCHAWCERAVVETLLNLPTPIASLSQSMRKQSFELLQLIVRRGALGDHEGRVLMDGFLRAMSGEKDPRNL
LFCLRFAAELLTTYANVVDADVAKGFFDATSCYFPITFRPPPNDPYGITSEDLVLALRSVFVGHDSLAKHVLPMVLDKLSRTTVVEMTKDILETLAFCCA
KYPLNRLLLHFTPVAAAVYHHVLHGDNTAVIAVAIDALKTITRAVSPPSKLPGMQALAWNKCIVYLVNQAVEDLAHQAPDSMVSTGAGHVLCAIASVGVA
GFSHVLSSALALLLEQCAAQAGSPAEAATARLVQLLGCIDAEVDHSAPPLVPYVSAIQTTLVHGLETATSSRQQKLCLQGLRCLVLRPPSPLLDDASLEV
LLQGWTSTVLSNPFPDVRDEATSTLQAIALKSPGLAQIVLTRCVPSFLQVLEQPAVLFFASWCGDMDDGLGQCSVWAVDRGHGARHPRGPHAALARPRHL
SAPPAAVPDQLDAPVCDRDDGGRGRHCPRQQGLGRVHGLRHPRHSHFIVGALPPRRRARRARPDAVDRRPSDRAGDGQHERACHAVRVPPGANNAAHVDL
AAGLDVGHFALAWPRPATATIERSTLLVRRGVDGARTRRAAAPLAAAVYARRAEQRRRREHSQGACGALQRPPRGHAAVRCVPKVDHVARCPPRRHGVAG
GRHS*

>MMS19_polPal Polysphondylium pallidum amoeba EFA86574 994 aa x HEAT 28%
MSKANIDSYININNNDQTKQTSLNILLLEINANKLSIHQLVEYLGDYLQNTDSILRARGTLLLSEVLCRLPDLKLNEAQVEFLAAFYHDRLQDYACASEV
VKGVYGLCVNHKVPYPHNQKMIRAIFQEVHPSTLVQTHRKMVLQLIEHLLEHNLTEIQELKGDFMAGFLQFIDGEKDPRNIIYTFRLIPRVILYIPEYKN
FADSLFEILSCYFPISFNPKPGDPNSITKDDLVSSLLNCFGASTYFAEHCIPFLIDKICSNVVDTKIESLKTLLFCCSKYGPVALRPHLDDIWGTLRTQI
LTQKSATVIDESKKTMFYLTRVLAADQETLQSFLSMVDKECLHHIKTSQDSKLAVSCASILFQTVSASVKSSRIVLSHILPTIIDFFKELSLHLSDDPIH
KANEQLSIIGLFNDLLKANNISFQYNNENIDKEINPLEEYKDKLYDLFIGLLSNSSALVRTLAVDCLANLYVTRHIKTSVPITFVLDQEKRQSIIKDLGV
WLLIQIFRNKSLEALMSITKLEQVEQMNLFAIPTLLQMINANQSKNVSESKHYLEAFSQLCTHQPLLQSVIPQIKTLLEHSIKKKYINNDEFENSLLVLQ
SLENTFSNSIDEQTMTICYREILLPLVKELFEQVFSLDVNSQEQKDQVLGIMKPAISMIHSNNKKEAIELFINIYLNGDLSALQINKEFKPFSSDATEQA
KLLIPIFTSVISQSKFELSTNKLLKEMLMSRALDSNVEESISNACAICYGSIINKQTDQTDLPLDHLEQLISSSSTNKTQALNLLIWIEKGLVTNGNPQS
IKVGELLAQLITSENTEISQKAAKSFYILLSDHDTFDHKSGAIVKRQKNETVSSQFLVAITNLLRNVPKEVLLGELQEVLPIVLHSLHSNQRDLLNSSLQ
TLMMLVDEASTSISSHLDSLIPTLIKISVNGESLTFRQSSLEILTRISRAIPYPKIYPFRNQVINGIVPALDDKKRLVRREATKCRNSWFILQ*

>MMS19_entHis Entamoeba histolytica amoeba XP_651925 868 aa x HEAT 25%
MSTPAQQLNEFIESPKVIKEGYEIIDQLMKNNYNVNSLVTDLGDTLPSEDERIRFRATSLLTYCLIKYPIKEESKDVFVDYLASRLVDAVCLEPILTALL
QLVTKKPSDEIINEIAMAYSCMRTQLYTKEVRILVYQFYKVFINYYQATEVIDTCVQLIELERDPECLKEVFDLIKLVSQKNEIDADSAPLLFDCASAYF
PILYPPKGDEALRIDLTNKILDAFVSAPIYAQFALPFLLDKLDADLSSIKLEALKAIYFCIQRFELKYVYAYFTHIWESIEQNISTVGVVEVNEFAFAIA
SYFCSLDDFHSKNLMESIKMFCLRMMSETDEIIINFVNGLLEELTKKSEKFFKVFVPVFIQCFHDQLQDADDRPKEQFERELFIVRLIYQRIIEGMPLLD
CVKGQVAWDLHRLATPLHPCFVSLLDIDVSLALLNLLGEQRMVPFQNAIELSENKCHDAIPILQRLYEKEEDVMISLLPANKIITNLELVSGIALHSPKL
FEQLLKLIPTLQSNEYVPVFQSILSDALPFNCLDVYVNHCIPVFIVITNGVLSPLFNTLMNRLSRLHSILSSKKISELTEGVLSQLKEHSRLLLILPSLL
QFYQPENLIVYLNEVQEVDKDTIAIYSLLISKLTNIIPHVLEQNKEYFNGYKTIQELDSHESNKQATPIFIEELCRMNNKAIECLKEMIVFDSINKKNEL
HWKEELFNLVYERFIESHQVTTVEESHIMILLFSLLPTEKLLTYESTVLKIFNIICVPTSHLNEIDSVVVLLFNILPTVSQYPMSLIESELDSIITKLFN
VLYINGTTIKYRCDIIDLLTRIRVVYGIDAIRPYQKNVIKKLLVPLDDNKRLVRRSAAICRNIWETTA*

>MMS19_naeGru Naegleria gruberi early eukaryote: heterolobosea XP_002678884 1070 aa x HEAT 27%
MQTSSNSNGEQELISLIDSLCNPTLPNTNKESLKSKLIEFVVNGTLTINEGIKLLGEYLNHATDDRIRGAAYAVLDLILENIPNNVGSETDETKQTTQLK
LVASLLRFIGDRFYDFDCLATLLPCLFSLFKKWSSYISSEQAINVVLQFFENVNIQSIGSTSGVAHATKTRSLCFEWFSLLADRFPSIVRTIDFLNGFIQ
SLEGERDPGNLLYCFNLIPKVIAIFDDSELSSKILSAVSDDLFDITSCYFPITYTPPANDTRGITREDLSRSLKLCFGCNKFFAPTLFPFLLEKLSSDLV
DTKLETLDYLCYCIEKFGEVNSREYLTEIWSYIKAESVKTNSMDVMKKCYESITKIARIVIIPNDPSNKPFDIPNIEAILRTALLELKSKEPKFAAQYAR
MIYACAVPTFEISMMVFNRVMPELVATLSESDTKDKLYGSLLMITQLLQAVAEQKGENQLPEVVFNLISQVQTVFLSIYEEEFSKNDKEMILVMVETISR
IAIFRIPSTLLRDIYVSRILLKSYGEENKSFSLLHATSLEEYKERVIKDIAWIYKYAPDIVSEDILVPLFGALYGCENKSEHINRILSNISAVGKVCPSM
TPSITHRLFERIESIPISESHYEHERVKVFETITSLDVSLIPAHDKVSYIQRIVKMSVTDSSSQMVDDSDTMDCSDSECAHVHHNQGNFSFLTLLLGRSL
ENELQQVVLDSVLQYANSVPSTGLKNFISVLSAIVIACRPTVGMGNLITMTDSLLQMALKGEQPSQVTKCIAQLVGSVLNKLPLDSTEFQQLITICNATV
FDAFSQMLTVYNGDSESAERYIEMVSWILKGLVMRGAYVPHADRYSSLLCGSLVFEYNSSKVNKKVAEGFLIAIGEDETSIHKENHAIIQVLYKQRFFAT
NVRKLMDSINTVTQPHIIGSILLALSNLIHNVPTKVILSEVKNIFPIVLKFLEMRQILIEQDNNSEDLLYAAIKTTLTLLSDAKEEMSVHLSSIVPILLD
TCKFKKSQAVRILSVEALLELTNGYKYYEIYPLKKDIIKGLEACLDDKKRKVRKAAVKCRNSYFVLSNNQ*

>MMS19_phyInf Phytophthora infestans early eukaryote: stramenopiles 1114 aa x HEAT 33%
MVSYEQLGSLPQKGSQNPVVNQKLEAIAMFSLDAPLAPAIDAFVDPENDDAAQKTGLNTVVMQVHRHVSMEALIQALGAYLTNGDDKVRSRATLLLAEVL
TRLPELQLTPSAVQLLMTFFADRLADFPSASACLRALLALETHHAAQVQSPRTTVALIPKLGKTLHIPQLGQAMRKMCFDLMQLALMQSTVVELLLDSVP
ASKDAQDASVDDAEQSEDLGRQLAQTFLSAMEGEKDPRNLLLCMQVARTLLSKLEPVFSRSDTLLQQYFDVVSCYFPIIFTPPPNDPYGITSEGLILSLR
HAFAASDLLAPLVLPFLLKKLASTVVEAKLDAIQTLVFCGERYSVNALLLQMHAVATALYDEVLDGEKQEVIAEARQAISRFSGVVARAKAQDTPGAAYA
WSKFVVDMTARAAGELRENAADSMVSVSAGQVLAALGRESSMSFAHVLKIAVPLLVEQLNNESSGSDSVPSKCEAALARILLLIDTIDREIDQSGQGQPM
RPHAAALIDALVNFLSSDHDNQTKPGSSPTARCVAVEALCHLLTFPPSPIVAPAQVKALINLFTRMLLLDPVAEVRTACLQSLKEISTVSTASEGSTNSG
EHPVTGGYAAFVVEISLARLMAAVSEGSDQEDDDDEEGTGVAAVLTASNRNFDSFFEEALLAITELCRESSIFQATIFLLIDLCVEKGDGKQSAIGFCEA
EGDATRQRHVDCILDAVAKIVEINAGDRTSMEFCVKASSSASIIFRLLTAVETLAARATASSGYKSGLVDEVKLSACVRIFRAVMQNVSSATQQQLVDAV
VPAFLRTNTSEPASLQFVPLFAAVINSAARDVALPDSSLVINRLLELAQSGATAVSESPPRQLQLVYTDAALSAAKSLASIVNKMSDGAEFDALIDLLLS
RKLAVVISNSAESFTVRVAALQIYAWIAKALVIRGHKVHAPVCLRFLCSFLTPDGDVNMEQEGDDQHAAALRMEVAKTFKLLVSEYLDVLNRKCGAFITF
LYRQRLFDLVFPVLLEYIRARIDEESSVAALVAFAQVIAHSPKAIYLPHLAQIFPLMVQALNTDDRELGSAAIQTFKPLLLESVESAKPFLKDVFPGLLK
QAQFGYVVSCSDS*

>MMS19_albLai Albugo laibachii early eukaryote: stramenopiles 1077 aa x HEAT 27%
MFQLDAPLSPAIKKFIDSGASNDEETGQKTSLNAVVMHTHRIGSIETLIQELEPYLTDDCNDFARARATLLIAEVLTRLPDLPLSGNRIQVLNNFFCARL
DDPPSIPASFQALLALQKHHSTEIPDSENMELVIRISDTLHVPQLNQPMRKRYYELVYLVIQQERMQKALSRSQQAQVFIRSFLNAMTGEKDPRNLKHCF
QIAQTMMQKLEMVFQEAELSEQYFRVISCYFPITFTPPPNDPYGVTTEELIRSLRNVLTASDVLIHQMVPFLLEKLSGSMSEEAKVDALDTLGHCVETFS
LKNLLLHIRSIGQVFYHEILNGERARVIETASNVLSRVSSVIGRAKVQGSSGSGFAWNAVVVTITNQAVEKLHENSVDSMSSASAGKVLASMSRESLVVS
THVLNTSMPLLIEQVKHSFEASSSQCEAALDRLMLFVDTIDEEVEQISTIHPIHSHASPILEALVKFLEEDTPTSTPNAKRLSIRIISHLVIYPSTPVVR
PSDVERIVRLFTRGFLSDASKHVRSEFLSSLKALSGAIKTPSTLQSVHCKREKTLQLYGTLLKEHCIAQLLALVQDGKSPEAETFQKSSCRTRKDFEQDT
LAAITELSHDPVIFKEAVVHLLQSCFIDQDGLLIFRSFEVEHTLQFFQAVATIIELNASNASNMEFCASIDDQNGIAFKLLDAFVSMAMSNGQSKEQKFL
PPNAIAFSTRILRTIMQNICFDTQQKLLDRAISRFHPILQTEESTPSQHLYQIVSAFSTVINSANRSLAFPKAYCVIDSLMAVSRSITTESHGYTNEIVL
LISQSIGSILNKVRDKHFEAKVESLLTGLSQSIHNDQEQAQWHTSIEVYIWITKGLLLCGHPKYSSQSVAFLTQLLIHHSDKGVRGQVAEGVRVILTEFP
NVLNRKCGASCNMLFRQRLFELVGPNLLAFISKHSEETTEALTGFCYIVAFSPKAAFISLISTIMPLVLRGLSSDHVELGAAAIKAYKIVSDTSIEHVKP
FLKDVFHGLLQQAQHSANALDRKDALECIGMLTTLPYELIHSYKDRVLRQLLFCLDDRKRFVRYTAVRVRNKWSVL*
>CIAO1_homSap Homo sapiens O76071 length=339 3FM0_A PDB: 3FM0
MKDSLVLLGRVPAHPDSRCWFLAWNPAGTLLASCGGDRRIRIWGTEGDSWICKSVLSEGHQRTVRKVAWSPCGNYLASASFDATTCIWKKNQDDFECVTT
LEGHENEVKSVAWAPSGNLLATCSRDKSVWVWEVDEEDEYECVSVLNSHTQDVKHVVWHPSQELLASASYDDTVKLYREEEDDWVCCATLEGHESTVWSL
AFDPSGQRLASCSDDRTVRIWRQYLPGNEQGVACSGSDPSWKCICTLSGFHSRTIYDIAWCQLTGALATACGDDAIRVFQEDPNSDPQQPTFSLTAHLHQ
AHSQDVNCVAWNPKEPGLLASCSDDGEVAFWKYQRPEGL*

>CIAO1_droMel Drosophila melanogaster Q7K1Y4
MGRLILEHTLQGHKGRIWGVAWHPKGNVFASCGEDKAIRIWSLTGNTWSTKTILSDGHKRTIREIRWSPCGQYLASASFDATTAIWSKSSGEFECNATLE
GHENEVKSVSWSRSGGLLATCSRDKSVWIWEVAGDDEFECAAVLNPHTQDVKRVVWHPTKDILASASYDNTIKMFAEEPIDNDWDCTATLTSHTSTVWGI
DFDADGERLVSCSDDTTIKIWRAYHPGNTAGVATPDQQTVWKCVCTVSGQHSRAIYDVSWCKLTGLIATACGDDGIRIFKESSDSKPDEPTFEQITAEEG
AHDQDVNSVQWNPVVAGQLISCSDDGTIKIWKVTE*

>CIAO1_triAdh Trichoplax adhaerens B3RNR8
MTTVAFLPLSFPFLIFNFGQYIRIWAKNSDSDQWTCKSILTEGHTRTIRSVAWSPCGNYLASCSFDATICIWSKKDGDFECMATLEGHENEVKCVNWSSS
GVYLASCSRDKSAWIWEFIEEDEEYECASVLTDHSQDVKHVVWSPKENALVSASYDNTIKIYKEVDDDWECSHTLIGHESTVWSLSFHSSGELFVSCGDD
KVLKIWKCLKSGPSDVKWISICTIAGYHNRPIYDVDWSKLNNKIATACGDDAIRIFSIVRITISISNQLLFIAYYQAHNHDVNVVRWHPKVDNILASGSD
DNCIKIWKVHSNN*

>CIAO1_nemVec Nematostella vectensis A7RWD2 cnidarian
MTGHEDRVWSVAWSPNGFVLASCGGDKTIRIWGKEGDKWICKTILEDGHQRTIRSLGWSPCGTFLASASFDATTCIWDQKSGEFECNATLEGHENEVKSV
DWSVSGSLLATCGRDKSVWIWEVQEDDEYECASVIHSHTQDVKKVVWHPTKEILASCSYDDTIKLYKEDEDDWSCCDTLEGHESTVWSISFDGSGDRIVS
CSDDKTVRIWKSYPPGNQEGVVVSGKHTKWKCVCVLSGYHDRTIYDVHWSKVSGLIATASGDDCIRIFKEDTNSDRNQPSFQLVATQRKAHSMDVNSICW
HPKDENILATCSDDGTVKLWRFTPAEE*

>CIAO1_sacCer Saccharomyces cerevisiae  A6ZYM0 length=330 Cia1 YDR267C PDB: 2HES
MASINLIKSLKLYKEKIWSFDFSQGILATGSTDRKIKLVSVKYDDFTLIDVLDETAHKKAIRSVAWRPHTSLLAAGSFDSTVSIWAKEESADRTFEMDLL
AIIEGHENEVKGVAWSNDGYYLATCSRDKSVWIWETDESGEEYECISVLQEHSQDVKHVIWHPSEALLASSSYDDTVRIWKDYDDDWECVAVLNGHEGTV
WSSDFDKTEGVFRLCSGSDDSTVRVWKYMGDDEDDQQEWVCEAILPDVHKRQVYNVAWGFNGLIASVGADGVLAVYEEVDGEWKVFAKRALCHGVYEINV
VKWLELNGKTILATGGDDGIVNFWSLEKAA*

>CIAO1_chlRei Chlamydomonas reinhardtii A8IZG4
MDPFTLEPIGALSGHDDRVWNVAWSPQGDMLASCSGDKTVRIWSRRQPRPSEQWYCSAILDQCHTRTIRSVAWSPTGRALATASFDATVAVWELSSGVWE
QVAELEGHENEVKCVAWNPDGRLIATCGRDRSVWIWESMPGREFECVDVKQGHSQDVKAVTWHPSGELLVSAGYDDTIKLWTYDGDEWGCAQTLGGTGTG
HESTVWDVCWDPVSRARLASCSDDLTLRLWESRAAPTSTPASAPAGAAAAGFVPSRPDLRCAVTLSGHHRRTVFSLDWAPTGLIATGDGDDSILAEEEAS
GLLTQPGGQWGCWARVAKAHGADVNCVRWNPAEPRLLASCSDDGLIRLWWLR*
 
>CIAO1_dicDis Dictyostelium discoideum XP_646229 amoebozoa
MTDTTKNDKYNLKLIDSMQKEAPYDKVWNLAWHPNGEILATCANDKYIQIWSKDTNGKWGLVQSLEGHEKTVRRVAWSPCGRFLAGASFDASTSIWEKSK
DELEFTHVSSLEGHTYEVKSVAWDSTGTLLATCSRDKSIWIWQMEDDNDFECLSINSGHGQDIKCVLWHPNEELLASSSYDDTIKFWKDIDGDWECINTL
TGHESSIWDLAFNKDGDKLVSCGEDKLVLFWKFDKENEKWINIFKFKNENSRPIYSIDWSSLTNTIVTGSADDSIIFYEQESDDTPDKYKIILKKKNAHD
SDVNCTKWNPKFKNILASCGDDGFIKIWELQDK*

>CIAO1_polPal Polysphondylium pallidum EFA75350 amoebozoa
MSLNEISVLSYDQPSKIWNIEWSPDGKLLASCGDDKTIHIWMEESENKWVVLQKLEAHEKTVRRIAWSPDGKYLAAASFDASTSIWEVNNGEFNHISTLE
GHSFEVKSVAWDASGQLLATCSRDKSIWIWQMEDDQDFECISINNGHSQDVKCVRWHPSLEILASASYDDTIKMWQDTDGDWECIDTLSAHESTIWDIQF
NASGNRLVSCSDDRSVCFWRLDSTTGRWKLLSRLESVHSRPIFSVDWSHNQELSPTEQLICTGGGDDSIIIYHQKQQQQQQQSDSSSSSSTTPNEIEQYE
ILYKHEKAHKSDINSIRWNPKKPNILASSGDDSTIKIWSFVC*

>CIAO1_tetThe Tetrahymena thermophila XP_001017221 alveolata
MIEEKMEEQKEFVKCIGQLNGHTDKIWSVSWHPTLDIFATCSSDKTIKIWGLKENSENQYELKQTISDTHERTIRTLAFSPDGMMLACGSFDSTISIYAL
NNGSFEFVSKLEGHEHEVKCVAWDSEGKFLASCSRDKTVWVWDYENGFDFSCYSVIDAHTQDVKHVKWIPGTNNLASTSFDDKLKLWEQEDDDWKCSATY
SNHSATVWCVEFSKTGQYMASCGDDKQIKVYKKNENGAFSSPYIVETTIKNAHARTIYSLSFSEDATFLASVGADNTLNVYQKNMYVTTFEGQDNNLYEL
LEKKVNCHFADINCVAFHPSKDILVTVSDDRQIKLWSVEINL*

>CIAO1_phySoj Phytophthora sojae EGZ17716 stramenopiles fragment
LGVRGHPRGRAGPHHPRLRYRARCRSPDGRYLASVSFDATTVIWEKQGSSYEVISSLEGHESEVKSVAWSPSGSYLATCSRDKSVWIWEADADTDFECIS
VLHGHTQDVKFVAWHPTEDLLVSASYDDTVRIWAENDDDWYCKETLAGHTSTVWGVALNPQGTQMASVSDDTDVVVWQRDVNSKEVNEDGSPKEWKQAFT
VSGCHERTIFSVDWSKHGDLLVTGAADNAIRVFQGQPTDSPSSFELAVQQKEAHASDINCVRWSPQLQEDGGKKALLLASASDDGLVRIWKLQLP*

>CIAO1_thaPse Thalassiosira pseudonana XP_002294332 stramenopiles fragment
EWKLIATIREGHSRTIRSVAFAPTSSTLGVPILASASFDGKVLIWEHFADEENHGTFEPIAQLEGHENEIKHLAWNQTGSLLASCGRDKTIWIWECFLPG
TVGGSASGGGGDDEGEFECLAVLQGHEGDVKSIAFALSHGQWGEGDEILLSASYDNSIKVWAEESGDWYCAATLAVHTSTVWCLGINPGGVRFLSGSEDG
SMAIWKMYTATERKRLFPREHAVSSTDGLWNSGHGRIASGGGDNCIQIYREETGGSGAGSSSDAPKFAIEAMAINAHDGDVNCVKWYPRDGTSLVSCGDD
GAVRIWKYSQAG*

>CIAO1_naeGru Naegleria gruberi XP_002680935 heterolobosea
MTTNDDLAALTTQEIISAVEGNVSDHEESVWSIAWHPKYSNLLATCSSDKTVRLYYVRVLSPSGRLFAKCIDVLENQHNRTIRRVDWSLPSGNALACASF
DGTSSIWILLQNKLQNHLQALEEESQNSKESSPTTSANLGLLKCVSTLEGHENEVKSVAWNYKSASLMDQSDDHDGEDGDCGLLATCGRDKTVWVWEAID
KVGFSDFDCNSVCSGHTQDVKFVAWHPLTRSNMPSLLYSASYDNTIRIWKEGGFEEDHDRQSDEWKCVGILRGHTSTVWGLAFEPQLSSDDPEYPQYMVS
VGDDKSLILWREDVVGNYIDMNVTQVQTISDVHTRTIYYVDWCVYKHPSTGQSISLVATAGGDNTIAIYQFDTTTRQLKLLTKIANAHDSDINCCIWNKN
EFGLLSSCSDDGAVKFWKLKM*