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CYSI_VIBCH
ID   CYSI_VIBCH              Reviewed;         577 AA.
AC   Q9KUX3;
DT   13-SEP-2005, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2000, sequence version 1.
DT   03-AUG-2022, entry version 112.
DE   RecName: Full=Sulfite reductase [NADPH] hemoprotein beta-component {ECO:0000255|HAMAP-Rule:MF_01540};
DE            Short=SiR-HP {ECO:0000255|HAMAP-Rule:MF_01540};
DE            Short=SiRHP {ECO:0000255|HAMAP-Rule:MF_01540};
DE            EC=1.8.1.2 {ECO:0000255|HAMAP-Rule:MF_01540};
GN   Name=cysI {ECO:0000255|HAMAP-Rule:MF_01540}; OrderedLocusNames=VC_0385;
OS   Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Vibrionales; Vibrionaceae;
OC   Vibrio.
OX   NCBI_TaxID=243277;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 39315 / El Tor Inaba N16961;
RX   PubMed=10952301; DOI=10.1038/35020000;
RA   Heidelberg J.F., Eisen J.A., Nelson W.C., Clayton R.A., Gwinn M.L.,
RA   Dodson R.J., Haft D.H., Hickey E.K., Peterson J.D., Umayam L.A., Gill S.R.,
RA   Nelson K.E., Read T.D., Tettelin H., Richardson D.L., Ermolaeva M.D.,
RA   Vamathevan J.J., Bass S., Qin H., Dragoi I., Sellers P., McDonald L.A.,
RA   Utterback T.R., Fleischmann R.D., Nierman W.C., White O., Salzberg S.L.,
RA   Smith H.O., Colwell R.R., Mekalanos J.J., Venter J.C., Fraser C.M.;
RT   "DNA sequence of both chromosomes of the cholera pathogen Vibrio
RT   cholerae.";
RL   Nature 406:477-483(2000).
CC   -!- FUNCTION: Component of the sulfite reductase complex that catalyzes the
CC       6-electron reduction of sulfite to sulfide. This is one of several
CC       activities required for the biosynthesis of L-cysteine from sulfate.
CC       {ECO:0000255|HAMAP-Rule:MF_01540}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=3 H2O + hydrogen sulfide + 3 NADP(+) = 4 H(+) + 3 NADPH +
CC         sulfite; Xref=Rhea:RHEA:13801, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:17359, ChEBI:CHEBI:29919, ChEBI:CHEBI:57783,
CC         ChEBI:CHEBI:58349; EC=1.8.1.2; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01540};
CC   -!- COFACTOR:
CC       Name=siroheme; Xref=ChEBI:CHEBI:60052;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01540};
CC       Note=Binds 1 siroheme per subunit. {ECO:0000255|HAMAP-Rule:MF_01540};
CC   -!- COFACTOR:
CC       Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01540};
CC       Note=Binds 1 [4Fe-4S] cluster per subunit. {ECO:0000255|HAMAP-
CC       Rule:MF_01540};
CC   -!- PATHWAY: Sulfur metabolism; hydrogen sulfide biosynthesis; hydrogen
CC       sulfide from sulfite (NADPH route): step 1/1. {ECO:0000255|HAMAP-
CC       Rule:MF_01540}.
CC   -!- SUBUNIT: Alpha(8)-beta(8). The alpha component is a flavoprotein, the
CC       beta component is a hemoprotein. {ECO:0000255|HAMAP-Rule:MF_01540}.
CC   -!- SIMILARITY: Belongs to the nitrite and sulfite reductase 4Fe-4S domain
CC       family. {ECO:0000255|HAMAP-Rule:MF_01540}.
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DR   EMBL; AE003852; AAF93558.1; -; Genomic_DNA.
DR   PIR; C82329; C82329.
DR   RefSeq; NP_230039.1; NC_002505.1.
DR   RefSeq; WP_001275671.1; NZ_LT906614.1.
DR   AlphaFoldDB; Q9KUX3; -.
DR   SMR; Q9KUX3; -.
DR   STRING; 243277.VC_0385; -.
DR   PRIDE; Q9KUX3; -.
DR   DNASU; 2615028; -.
DR   EnsemblBacteria; AAF93558; AAF93558; VC_0385.
DR   GeneID; 57739120; -.
DR   KEGG; vch:VC_0385; -.
DR   PATRIC; fig|243277.26.peg.361; -.
DR   eggNOG; COG0155; Bacteria.
DR   HOGENOM; CLU_001975_3_2_6; -.
DR   OMA; MGMTHGD; -.
DR   BioCyc; VCHO:VC0385-MON; -.
DR   UniPathway; UPA00140; UER00207.
DR   Proteomes; UP000000584; Chromosome 1.
DR   GO; GO:0009337; C:sulfite reductase complex (NADPH); IBA:GO_Central.
DR   GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-KW.
DR   GO; GO:0020037; F:heme binding; IEA:InterPro.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0050661; F:NADP binding; IEA:InterPro.
DR   GO; GO:0050311; F:sulfite reductase (ferredoxin) activity; IBA:GO_Central.
DR   GO; GO:0004783; F:sulfite reductase (NADPH) activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0016002; F:sulfite reductase activity; IBA:GO_Central.
DR   GO; GO:0019344; P:cysteine biosynthetic process; IEA:UniProtKB-KW.
DR   GO; GO:0070814; P:hydrogen sulfide biosynthetic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0000103; P:sulfate assimilation; IBA:GO_Central.
DR   Gene3D; 3.30.413.10; -; 2.
DR   HAMAP; MF_01540; CysI; 1.
DR   InterPro; IPR011786; CysI.
DR   InterPro; IPR005117; NiRdtase/SiRdtase_haem-b_fer.
DR   InterPro; IPR036136; Nit/Sulf_reduc_fer-like_dom_sf.
DR   InterPro; IPR006067; NO2/SO3_Rdtase_4Fe4S_dom.
DR   InterPro; IPR045169; NO2/SO3_Rdtase_4Fe4S_prot.
DR   InterPro; IPR045854; NO2/SO3_Rdtase_4Fe4S_sf.
DR   InterPro; IPR006066; NO2/SO3_Rdtase_FeS/sirohaem_BS.
DR   PANTHER; PTHR11493; PTHR11493; 1.
DR   Pfam; PF01077; NIR_SIR; 2.
DR   Pfam; PF03460; NIR_SIR_ferr; 2.
DR   PRINTS; PR00397; SIROHAEM.
DR   SUPFAM; SSF55124; SSF55124; 2.
DR   SUPFAM; SSF56014; SSF56014; 2.
DR   TIGRFAMs; TIGR02041; CysI; 1.
DR   PROSITE; PS00365; NIR_SIR; 1.
PE   3: Inferred from homology;
KW   4Fe-4S; Amino-acid biosynthesis; Cysteine biosynthesis; Heme; Iron;
KW   Iron-sulfur; Metal-binding; NADP; Oxidoreductase; Reference proteome.
FT   CHAIN           1..577
FT                   /note="Sulfite reductase [NADPH] hemoprotein beta-
FT                   component"
FT                   /id="PRO_0000199912"
FT   BINDING         440
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT   BINDING         446
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT   BINDING         486
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT   BINDING         490
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT   BINDING         490
FT                   /ligand="siroheme"
FT                   /ligand_id="ChEBI:CHEBI:60052"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
SQ   SEQUENCE   577 AA;  64378 MW;  DB39CCC6AE14E2FD CRC64;
     MSANQNPSVQ EVLGEVLGPW SDNERLKRES HFLRGTIEQD LQDRITGGFT ADNFQLIRFH
     GMYQQDDRDI RAERSKQKLE PLHNVMLRAR MPGGIITPHQ WLAIDKFATE HTLYGSIRLT
     TRQTFQFHGV LKPNIKLMHQ TLNSIGIDSI ATAGDVNRNV LCTSNPVESE LHLQAYEWAK
     KISEHLLPKT RAYAEIWLDG EKIEGPDEEP ILGSNYLPRK FKTTVVIPPH NDVDVHANDL
     NFVAIGENGQ LVGFNVLVGG GLAMTHGDTS TYPRRADDFG FIPLEKTLEV AAAVVSTQRD
     WGNRSNRKNA KTKYTLDRVG VEVFKAEVEK RAGITFAPSR AYEFTSRGDR IGWVEGIDGK
     HHLTLFIENG RILDFPGKPL KTGVAEIAKV HQGDFRMTAN QNLIVAGVPA DQKPHIEQLA
     REHGLIDDGV SEQRINSMAC VAFPTCPLAM AEAERFLPSF VTEVEGILAK HALPKEENII
     LRVTGCPNGC GRAMLAEIGL VGKAPGRYNL HLGGNRNGTR IPKMYKENIT DTQILQEIDE
     LVGRWASERL DGEGFGDFTI RAGIIEEVII SKRDFYA
 
 
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