Reviewed, UniProtKB/Swiss-Prot Q5E840 (CYSI_VIBF1)

Names and origin

Protein names

Recommended name:
    Sulfite reductase [NADPH] hemoprotein beta-component
      Short name=SIR-HP
      Short name=SIRHP
    EC=1.8.1.2

Gene names

Name:	cysI
Ordered Locus Names:	VF_0311

Organism

Vibrio fischeri (strain ATCC 700601 / ES114) [Complete proteome] [HAMAP]

Taxonomic identifier

312309 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Gammaproteobacteria › Vibrionales › Vibrionaceae › Aliivibrio

Protein attributes

Sequence length	576 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is not processed.
Protein existence	Inferred from homology.

General annotation (Comments)

Function	This enzyme catalyzes the 6-electron reduction of sulfite to sulfide. This is one of several activities required for the biosynthesis of L-cysteine from sulfate By similarity.
Catalytic activity	H(2)S + 3 NADP(+) + 3 H(2)O = sulfite + 3 NADPH.
Cofactor	Binds 1 siroheme per subunit By similarity. Binds 1 4Fe-4S cluster per subunit By similarity.
Subunit structure	Alpha(8)-beta(4). The alpha component is a flavoprotein, the beta component is a hemoprotein By similarity.
Sequence similarities	Belongs to the nitrite and sulfite reductase 4Fe-4S domain family.

Ontologies

Keywords
Biological process	Amino-acid biosynthesis Cysteine biosynthesis
Ligand	4Fe-4S Heme Iron Iron-sulfur Metal-binding NADP
Molecular function	Oxidoreductase
Technical term	Complete proteome
Gene Ontology (GO)
Biological process	cysteine biosynthetic process Inferred from electronic annotation. Source: UniProtKB-KW oxidation reduction Inferred from electronic annotation. Source: UniProtKB-KW sulfate assimilation Inferred from electronic annotation. Source: HAMAP
Cellular component	sulfite reductase complex (NADPH) Inferred from electronic annotation. Source: InterPro
Molecular function	4 iron, 4 sulfur cluster binding Inferred from electronic annotation. Source: InterPro NADP binding Inferred from electronic annotation. Source: InterPro electron carrier activity Inferred from electronic annotation. Source: InterPro heme binding Inferred from electronic annotation. Source: InterPro iron ion binding Inferred from electronic annotation. Source: UniProtKB-KW sulfite reductase (NADPH) activity Inferred from electronic annotation. Source: HAMAP
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – 576	576	Sulfite reductase [NADPH] hemoprotein beta-component		PRO_0000199913
Sites
	Metal binding	439	1	Iron-sulfur (4Fe-4S) By similarity
	Metal binding	445	1	Iron-sulfur (4Fe-4S) By similarity
	Metal binding	485	1	Iron-sulfur (4Fe-4S) By similarity
	Metal binding	489	1	Iron (siroheme axial ligand) By similarity
	Metal binding	489	1	Iron-sulfur (4Fe-4S) By similarity

Sequences

	Sequence		Length	Mass (Da)
	Q5E840-1 [UniParc]. Last modified March 15, 2005. Version 1. Checksum: DEC6E859BAF9FD3C	FASTA	576	64,631
	10 20 30 40 50 60 MSELIDVKTI LSGTELGPLA DNERLKRESK YLRGTIVEDL QDRITGGFTK DNFQLIRFHG 70 80 90 100 110 120 MYQQDDRDIR AERAKQKLEP LHNVMLRARM PGGIITPKQW LAIDKFAEEH TSYGSLRLTT 130 140 150 160 170 180 RQTFQFHGVL KPNIKLMHQT LNSIGIDSIA TAGDVNRNVL CTTNPVESEL HQEAYEWAKK 190 200 210 220 230 240 ISEHLLPKTR AYAEIWLDGE KLETTDEEPI LGSNYLPRKF KTTVVIPPQN DVDVHANDLN 250 260 270 280 290 300 FIAIADNGKL VGFNVLVGGG LAMTHGDTAT YPRKADDFGF VPLDKTLDVA AAVVTTQRDW 310 320 330 340 350 360 GNRSNRKNAK TKYTLDRVGS DVFKGEVEKR AGVQFEKSRP YELTERGDRI GWVEGIDGKH 370 380 390 400 410 420 HLALFIENGR LLDYPGKPLK TGVAEIAKVH QGDFRMTANQ NLIVAGVPSE QKDHIEQIAR 430 440 450 460 470 480 AHGLIDDTHS EQRKNSMACV AFPTCPLAMA EAERFLPEFV TEIEGVLKKH NLPEEDNIIF 490 500 510 520 530 540 RVTGCPNGCG RAMLAEIGLV GKAPGRYNFH LGGNRSGTRV PKMYKENITD RQILTEIDQL 550 560 570 VGRWATERNE NEGFGDFTIR AGIVDEVKVS KRDFHA

References

[1]

"Complete genome sequence of Vibrio fischeri: a symbiotic bacterium with pathogenic congeners." Ruby E.G., Urbanowski M., Campbell J., Dunn A., Faini M., Gunsalus R., Lostroh P., Lupp C., McCann J., Millikan D., Schaefer A., Stabb E., Stevens A., Visick K., Whistler C., Greenberg E.P. Proc. Natl. Acad. Sci. U.S.A. 102:3004-3009(2005) [PubMed: 15703294] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	CP000020 Genomic DNA. Translation: AAW84806.1.
RefSeq	YP_203694.1.
3D structure databases
ModBase	Search...
Genome annotation databases
GeneID	3277269.
GenomeReviews	Gene locus VF_0311 in contig CP000020_GR.
KEGG	vfi:VF0311.
NMPDR	fig|312309.3.peg.311.
Organism-specific databases
CMR	Search...
Phylogenomic databases
HOGENOM	Q5E840.
Enzyme and pathway databases
BioCyc	VFIS312309:VF0311-MON.
Family and domain databases
HAMAP	MF_01540. [Tree]
InterPro	IPR011786. CysI. IPR006066. Nir_Si_BS. IPR006067. Nir_Sir_4Fe4S. IPR005117. NiRdtase/SiRdtase_haem-b_fer. [Graphical view]
Pfam	PF01077. NIR_SIR. 1 hit. PF03460. NIR_SIR_ferr. 2 hits. [Graphical view]
PRINTS	PR00397. SIROHAEM.
TIGRFAMs	TIGR02041. CysI. 1 hit.
PROSITE	PS00365. NIR_SIR. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

CYSI_VIBF1

Accession

Primary (citable) accession number: Q5E840

Entry history

Integrated into UniProtKB/Swiss-Prot:	September 13, 2005
Last sequence update:	March 15, 2005
Last modified:	November 25, 2008
This is version 24 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

HAMAP (High-quality Automated and Manual Annotation of microbial Proteomes)