ID CYSI_ALTMD Reviewed; 573 AA.
AC B4RYS6; F2G4G1;
DT 14-APR-2009, integrated into UniProtKB/Swiss-Prot.
DT 23-SEP-2008, sequence version 1.
DT 27-MAR-2024, entry version 95.
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};
GN OrderedLocusNames=MADE_1016735;
OS Alteromonas mediterranea (strain DSM 17117 / CIP 110805 / LMG 28347 / Deep
OS ecotype).
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Alteromonadales;
OC Alteromonadaceae; Alteromonas/Salinimonas group; Alteromonas.
OX NCBI_TaxID=1774373;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=DSM 17117 / CIP 110805 / LMG 28347 / Deep ecotype;
RX PubMed=18670397; DOI=10.1038/ismej.2008.74;
RA Ivars-Martinez E., Martin-Cuadrado A.-B., D'Auria G., Mira A., Ferriera S.,
RA Johnson J., Friedman R., Rodriguez-Valera F.;
RT "Comparative genomics of two ecotypes of the marine planktonic copiotroph
RT Alteromonas macleodii suggests alternative lifestyles associated with
RT different kinds of particulate organic matter.";
RL ISME J. 2:1194-1212(2008).
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; CP001103; AEA99471.1; -; Genomic_DNA.
DR RefSeq; WP_012519759.1; NC_011138.3.
DR AlphaFoldDB; B4RYS6; -.
DR SMR; B4RYS6; -.
DR KEGG; amc:MADE_1016735; -.
DR HOGENOM; CLU_001975_3_2_6; -.
DR UniPathway; UPA00140; UER00207.
DR Proteomes; UP000001870; Chromosome.
DR GO; GO:0009337; C:sulfite reductase complex (NADPH); IEA:InterPro.
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:0004783; F:sulfite reductase (NADPH) activity; IEA:UniProtKB-UniRule.
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; IEA:UniProtKB-UniRule.
DR Gene3D; 3.30.413.10; Sulfite Reductase Hemoprotein, domain 1; 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 NCBIfam; TIGR02041; CysI; 1.
DR PANTHER; PTHR11493:SF47; SULFITE REDUCTASE [NADPH] SUBUNIT BETA; 1.
DR PANTHER; PTHR11493; SULFITE REDUCTASE [NADPH] SUBUNIT BETA-RELATED; 1.
DR Pfam; PF01077; NIR_SIR; 1.
DR Pfam; PF03460; NIR_SIR_ferr; 2.
DR PRINTS; PR00397; SIROHAEM.
DR SUPFAM; SSF56014; Nitrite and sulphite reductase 4Fe-4S domain-like; 2.
DR SUPFAM; SSF55124; Nitrite/Sulfite reductase N-terminal domain-like; 2.
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.
FT CHAIN 1..573
FT /note="Sulfite reductase [NADPH] hemoprotein beta-
FT component"
FT /id="PRO_1000146642"
FT BINDING 436
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT BINDING 442
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT BINDING 481
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT BINDING 485
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT BINDING 485
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 573 AA; 63913 MW; E2A6169D732D1744 CRC64;
MSNEKSPFIV EGKLADNERL KRESNNLRGT ITTDLKDDLT GGFTADNFQL IRFHGMYQQD
DRDIRAERAK QKLEPLHNVM LRARLPGGVI TPDQWLAIDK FADDHTMYGS IRLTTRQTFQ
FHGVLKPQIK LMHQTLNKVG IDSIATAGDV NRNVLCTSNP VESELHLHAY EWAKKISEHL
LPKTRAYAEI WLDGEKVETT EKPVEPILGD NYLPRKFKTT VVIPPQNDVD VHANDLNFVA
IAENGQLVGF NVLVGGGLAM THGDKSTYPR KASDFGFIPL ENTLDVAAAV VTTQRDWGNR
VNRKNAKTKY TLERVGVDNF KAEVEKRAGV TFQESRPYEF TDRGDRFGWV EGIDGKYHLT
VFIENGRILD YPGKTLKTGC AEIAKIHKGD FRLTANQNLI IAGVPPQDKD KIEALAREHG
LIAPSISNQR LDSMACVALP TCPLAMAEAE RYLPDAVTEL EGLLAKHGLE EDSVIFRVTG
CPNGCGRAML SEVGLVGKGP GKYNLHLGGN REGTRIPRMY RENISEQEIM AELDTLLGQW
AKERDSGEAF GDYVVRAGVV KPVVDSARDF YDQ
//
