ID B7L0Y3_METC4 Unreviewed; 595 AA.
AC B7L0Y3;
DT 10-FEB-2009, integrated into UniProtKB/TrEMBL.
DT 10-FEB-2009, sequence version 1.
DT 27-MAR-2024, entry version 91.
DE RecName: Full=Sulfite reductase [NADPH] flavoprotein alpha-component {ECO:0000256|PIRNR:PIRNR000207};
DE Short=SiR-FP {ECO:0000256|PIRNR:PIRNR000207};
DE EC=1.8.1.2 {ECO:0000256|PIRNR:PIRNR000207};
GN OrderedLocusNames=Mchl_2512 {ECO:0000313|EMBL:ACK83354.1};
OS Methylorubrum extorquens (strain CM4 / NCIMB 13688) (Methylobacterium
OS extorquens).
OC Bacteria; Pseudomonadota; Alphaproteobacteria; Hyphomicrobiales;
OC Methylobacteriaceae; Methylorubrum.
OX NCBI_TaxID=440085 {ECO:0000313|EMBL:ACK83354.1, ECO:0000313|Proteomes:UP000002385};
RN [1] {ECO:0000313|Proteomes:UP000002385}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=CM4 / NCIMB 13688 {ECO:0000313|Proteomes:UP000002385};
RG US DOE Joint Genome Institute;
RA Lucas S., Copeland A., Lapidus A., Glavina del Rio T., Dalin E., Tice H.,
RA Bruce D., Goodwin L., Pitluck S., Chertkov O., Brettin T., Detter J.C.,
RA Han C., Larimer F., Land M., Hauser L., Kyrpides N., Mikhailova N.,
RA Marx C., Richardson P.;
RT "Complete sequence of chromosome of Methylobacterium chloromethanicum
RT CM4.";
RL Submitted (DEC-2008) to the EMBL/GenBank/DDBJ databases.
RN [2] {ECO:0000313|EMBL:ACK83354.1, ECO:0000313|Proteomes:UP000002385}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=CM4 / NCIMB 13688 {ECO:0000313|Proteomes:UP000002385};
RX PubMed=22887658; DOI=10.1128/JB.01009-12;
RA Marx C.J., Bringel F., Chistoserdova L., Moulin L., Farhan Ul Haque M.,
RA Fleischman D.E., Gruffaz C., Jourand P., Knief C., Lee M.C., Muller E.E.,
RA Nadalig T., Peyraud R., Roselli S., Russ L., Goodwin L.A., Ivanova N.,
RA Kyrpides N., Lajus A., Land M.L., Medigue C., Mikhailova N., Nolan M.,
RA Woyke T., Stolyar S., Vorholt J.A., Vuilleumier S.;
RT "Complete genome sequences of six strains of the genus Methylobacterium.";
RL J. Bacteriol. 194:4746-4748(2012).
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 The flavoprotein component catalyzes the electron flow from NADPH ->
CC FAD -> FMN to the hemoprotein component.
CC {ECO:0000256|PIRNR:PIRNR000207}.
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;
CC Evidence={ECO:0000256|PIRNR:PIRNR000207};
CC -!- COFACTOR:
CC Name=FAD; Xref=ChEBI:CHEBI:57692;
CC Evidence={ECO:0000256|PIRNR:PIRNR000207,
CC ECO:0000256|PIRSR:PIRSR000207-1};
CC Note=Binds 1 FAD per subunit. {ECO:0000256|PIRNR:PIRNR000207,
CC ECO:0000256|PIRSR:PIRSR000207-1};
CC -!- COFACTOR:
CC Name=FMN; Xref=ChEBI:CHEBI:58210;
CC Evidence={ECO:0000256|PIRNR:PIRNR000207,
CC ECO:0000256|PIRSR:PIRSR000207-1};
CC Note=Binds 1 FMN per subunit. {ECO:0000256|PIRNR:PIRNR000207,
CC ECO:0000256|PIRSR:PIRSR000207-1};
CC -!- PATHWAY: Sulfur metabolism; hydrogen sulfide biosynthesis; hydrogen
CC sulfide from sulfite (NADPH route): step 1/1.
CC {ECO:0000256|PIRNR:PIRNR000207}.
CC -!- SUBUNIT: Alpha(8)-beta(8). The alpha component is a flavoprotein, the
CC beta component is a hemoprotein. {ECO:0000256|PIRNR:PIRNR000207}.
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DR EMBL; CP001298; ACK83354.1; -; Genomic_DNA.
DR AlphaFoldDB; B7L0Y3; -.
DR KEGG; mch:Mchl_2512; -.
DR HOGENOM; CLU_001570_17_7_5; -.
DR UniPathway; UPA00140; UER00207.
DR Proteomes; UP000002385; Chromosome.
DR GO; GO:0050660; F:flavin adenine dinucleotide binding; IEA:InterPro.
DR GO; GO:0010181; F:FMN binding; IEA:InterPro.
DR GO; GO:0004783; F:sulfite reductase (NADPH) activity; IEA:UniProtKB-EC.
DR GO; GO:0019344; P:cysteine biosynthetic process; IEA:UniProtKB-KW.
DR GO; GO:0070814; P:hydrogen sulfide biosynthetic process; IEA:UniProtKB-UniPathway.
DR CDD; cd06199; SiR; 1.
DR Gene3D; 3.40.50.360; -; 1.
DR Gene3D; 3.40.50.80; Nucleotide-binding domain of ferredoxin-NADP reductase (FNR) module; 1.
DR Gene3D; 2.40.30.10; Translation factors; 1.
DR InterPro; IPR010199; CysJ.
DR InterPro; IPR003097; CysJ-like_FAD-binding.
DR InterPro; IPR017927; FAD-bd_FR_type.
DR InterPro; IPR001094; Flavdoxin-like.
DR InterPro; IPR008254; Flavodoxin/NO_synth.
DR InterPro; IPR001709; Flavoprot_Pyr_Nucl_cyt_Rdtase.
DR InterPro; IPR029039; Flavoprotein-like_sf.
DR InterPro; IPR039261; FNR_nucleotide-bd.
DR InterPro; IPR023173; NADPH_Cyt_P450_Rdtase_alpha.
DR InterPro; IPR001433; OxRdtase_FAD/NAD-bd.
DR InterPro; IPR017938; Riboflavin_synthase-like_b-brl.
DR PANTHER; PTHR19384:SF128; NADPH OXIDOREDUCTASE A; 1.
DR PANTHER; PTHR19384; NITRIC OXIDE SYNTHASE-RELATED; 1.
DR Pfam; PF00667; FAD_binding_1; 2.
DR Pfam; PF00258; Flavodoxin_1; 1.
DR Pfam; PF00175; NAD_binding_1; 1.
DR PIRSF; PIRSF000207; SiR-FP_CysJ; 1.
DR PRINTS; PR00369; FLAVODOXIN.
DR PRINTS; PR00371; FPNCR.
DR SUPFAM; SSF52343; Ferredoxin reductase-like, C-terminal NADP-linked domain; 1.
DR SUPFAM; SSF52218; Flavoproteins; 1.
DR SUPFAM; SSF63380; Riboflavin synthase domain-like; 1.
DR PROSITE; PS51384; FAD_FR; 1.
DR PROSITE; PS50902; FLAVODOXIN_LIKE; 1.
PE 4: Predicted;
KW Amino-acid biosynthesis {ECO:0000256|ARBA:ARBA00022605,
KW ECO:0000256|PIRNR:PIRNR000207};
KW Cysteine biosynthesis {ECO:0000256|ARBA:ARBA00023192,
KW ECO:0000256|PIRNR:PIRNR000207};
KW Electron transport {ECO:0000256|ARBA:ARBA00022982,
KW ECO:0000256|PIRNR:PIRNR000207};
KW FAD {ECO:0000256|ARBA:ARBA00022827, ECO:0000256|PIRNR:PIRNR000207};
KW Flavoprotein {ECO:0000256|ARBA:ARBA00022630,
KW ECO:0000256|PIRNR:PIRNR000207};
KW FMN {ECO:0000256|ARBA:ARBA00022643, ECO:0000256|PIRNR:PIRNR000207};
KW NAD {ECO:0000256|ARBA:ARBA00023027};
KW NADP {ECO:0000256|ARBA:ARBA00022857, ECO:0000256|PIRNR:PIRNR000207};
KW Oxidoreductase {ECO:0000256|ARBA:ARBA00023002,
KW ECO:0000256|PIRNR:PIRNR000207};
KW Transport {ECO:0000256|ARBA:ARBA00022448, ECO:0000256|PIRNR:PIRNR000207}.
FT DOMAIN 71..209
FT /note="Flavodoxin-like"
FT /evidence="ECO:0000259|PROSITE:PS50902"
FT DOMAIN 240..444
FT /note="FAD-binding FR-type"
FT /evidence="ECO:0000259|PROSITE:PS51384"
FT BINDING 160..169
FT /ligand="FMN"
FT /ligand_id="ChEBI:CHEBI:58210"
FT /evidence="ECO:0000256|PIRSR:PIRSR000207-1"
FT BINDING 319
FT /ligand="FAD"
FT /ligand_id="ChEBI:CHEBI:57692"
FT /evidence="ECO:0000256|PIRSR:PIRSR000207-1"
FT BINDING 382..385
FT /ligand="FAD"
FT /ligand_id="ChEBI:CHEBI:57692"
FT /evidence="ECO:0000256|PIRSR:PIRSR000207-1"
FT BINDING 400..402
FT /ligand="FAD"
FT /ligand_id="ChEBI:CHEBI:57692"
FT /evidence="ECO:0000256|PIRSR:PIRSR000207-1"
FT BINDING 406
FT /ligand="FAD"
FT /ligand_id="ChEBI:CHEBI:57692"
FT /evidence="ECO:0000256|PIRSR:PIRSR000207-1"
FT BINDING 415..418
FT /ligand="FAD"
FT /ligand_id="ChEBI:CHEBI:57692"
FT /evidence="ECO:0000256|PIRSR:PIRSR000207-1"
FT BINDING 515..516
FT /ligand="NADP(+)"
FT /ligand_id="ChEBI:CHEBI:58349"
FT /evidence="ECO:0000256|PIRSR:PIRSR000207-1"
FT BINDING 521..525
FT /ligand="NADP(+)"
FT /ligand_id="ChEBI:CHEBI:58349"
FT /evidence="ECO:0000256|PIRSR:PIRSR000207-1"
FT BINDING 557
FT /ligand="NADP(+)"
FT /ligand_id="ChEBI:CHEBI:58349"
FT /evidence="ECO:0000256|PIRSR:PIRSR000207-1"
FT BINDING 595
FT /ligand="FAD"
FT /ligand_id="ChEBI:CHEBI:57692"
FT /evidence="ECO:0000256|PIRSR:PIRSR000207-1"
SQ SEQUENCE 595 AA; 64255 MW; B2292D0F863AD42D CRC64;
MAPTMSRQAL LPRTAPFGDQ ERAHLDAALG AATPIQRAWL TGFLAGLDAA AGQPAAAAAA
PAAPPKAAEP LTILFASESG NSEKLAGDVS KLARKQGFKP KVVDFADLDL ATLPKAGKLI
AIAATWGEGE PPARAVRAYG ELMSDAAPRL DGLAFGVLAL GDTSYAEFCA IGKALDARFE
ALGAKRAYDR ADLDLDFEKP AAEWIKGTLK ALAPADVPAD NVVAVDFRAG AEDEDGEVSR
EPAVVEVIDH VNLNSSRSDK ETIHLALEFE DGAPAYEPGD SLEIFPENDP QLVDEILRAT
GLSGDEGLRK ALLAERDITT LSPTTVERFA KATGHADAQK FVESGEVKAW IEGRHLIDLI
ERFPTTLTAE HLNTVTRPLP PRAYSIASSR KEVGDEVHLT IAAVRYETYG RARAGVASVH
VADRIKNGAK LRVRVKPNKH FRLPSDPSTD IIMVGPGTGV APFRAFVQER RATEAPGRSW
LFFGDRHFTH DFLYQLEWQD ALEDGSLAKI DVAFSRDQPE KIYVQDRIDA HAAEVVEWLD
GGAHFYVCGD AKNMAKDVRA AVVRAFESVK GLSSADAEAH VASLERARRY QQDVY
//
