CYSI_XANCB
ID CYSI_XANCB Reviewed; 568 AA.
AC B0RPG6;
DT 03-NOV-2009, integrated into UniProtKB/Swiss-Prot.
DT 03-NOV-2009, sequence version 2.
DT 03-AUG-2022, entry version 81.
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=xcc-b100_1003;
OS Xanthomonas campestris pv. campestris (strain B100).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Xanthomonadales;
OC Xanthomonadaceae; Xanthomonas.
OX NCBI_TaxID=509169;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=B100;
RX PubMed=18304669; DOI=10.1016/j.jbiotec.2007.12.013;
RA Vorhoelter F.-J., Schneiker S., Goesmann A., Krause L., Bekel T.,
RA Kaiser O., Linke B., Patschkowski T., Rueckert C., Schmid J., Sidhu V.K.,
RA Sieber V., Tauch A., Watt S.A., Weisshaar B., Becker A., Niehaus K.,
RA Puehler A.;
RT "The genome of Xanthomonas campestris pv. campestris B100 and its use for
RT the reconstruction of metabolic pathways involved in xanthan
RT biosynthesis.";
RL J. Biotechnol. 134:33-45(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}.
CC -!- SEQUENCE CAUTION:
CC Sequence=CAP50351.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR EMBL; AM920689; CAP50351.1; ALT_INIT; Genomic_DNA.
DR AlphaFoldDB; B0RPG6; -.
DR SMR; B0RPG6; -.
DR KEGG; xca:xcc-b100_1003; -.
DR HOGENOM; CLU_001975_3_2_6; -.
DR UniPathway; UPA00140; UER00207.
DR Proteomes; UP000001188; 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; -; 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.
FT CHAIN 1..568
FT /note="Sulfite reductase [NADPH] hemoprotein beta-
FT component"
FT /id="PRO_0000388530"
FT BINDING 425
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT BINDING 431
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT BINDING 470
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT BINDING 474
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01540"
FT BINDING 474
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 568 AA; 62522 MW; 5F42BAAA6FA58A4B CRC64;
MTHSVEDIKS TSRRLRGSLE QSLADPVTGA LREDDQTLIK YHGSYQQDDR DIRDERRRQK
LEPAYQFMIR TRTPGGVISP SQWLALDGIA TRYANHSLRI TTRQAFQFHG VIKRELKATM
QAINATLIDT LAACGDVNRN VQVAANPLLS QAHATLYADA ARVSEHLLPN TRAYYEIWLD
EERVSGSGAE DEPIYGDRYL PRKFKIGFAA PPHNDVDVFA NDLGFIAILR EGQLLGYNVS
IGGGMGASHG DAETWPRVAN VIGFVTGDQL LDIATAVVTT QRDLGNRAVR KRARFKYTID
DHGLDTIVAE IERRAGFSLQ PAQPFAFAHN GDRYGWVEGE QGDWHLTLSL PAGRIADTDT
AAHLSGLRAI AQLQMGEFRM TPNQNLVIAG VPAEQRAQID QLVAQYGLDA GNLAPTALAR
GAMACVALPT CGLAMAEAER YLPDFSAALQ PLLERHGLAQ TPIVLRLSGC PNGCSRPYLA
EIALVGKAPG RYNLMLGGDR RGQRLNTLYR ENINEADILA ALEPLLARYA AERDRHTDEG
FGDFLHRSGL IALPPYPTHR HLDLELLA
