Reviewed, UniProtKB/Swiss-Prot B1IU78 (CYSI_ECOLC)

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:	EcolC_0949

Organism

Escherichia coli (strain ATCC 8739 / DSM 1576 / Crooks) [Complete proteome] [HAMAP]

Taxonomic identifier

481805 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Gammaproteobacteria › Enterobacteriales › Enterobacteriaceae › Escherichia

Protein attributes

Sequence length	570 AA.
Sequence status	Complete.
Protein existence	Inferred from homology.

General annotation (Comments)

Function	Component of the sulfite reductase complex that 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. HAMAP MF_01540
Catalytic activity	H2S + 3 NADP+ + 3 H2O = sulfite + 3 NADPH. HAMAP MF_01540
Cofactor	Binds 1 siroheme per subunit By similarity. HAMAP MF_01540 Binds 1 4Fe-4S cluster per subunit By similarity. HAMAP MF_01540
Pathway	Sulfur metabolism; hydrogen sulfide biosynthesis; hydrogen sulfide from sulfite (NADPH route): step 1/1. HAMAP MF_01540
Subunit structure	Alpha(8)-beta8. The alpha component is a flavoprotein, the beta component is a hemoprotein By similarity. HAMAP MF_01540
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 hydrogen sulfide biosynthetic process Inferred from electronic annotation. Source: HAMAP 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: UniProtKB-KW NADP or NADPH binding Inferred from electronic annotation. Source: InterPro heme binding Inferred from electronic annotation. Source: InterPro 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 – 570	570	Sulfite reductase [NADPH] hemoprotein beta-component HAMAP MF_01540		PRO_1000087626
Sites
	Metal binding	434	1	Iron-sulfur (4Fe-4S) By similarity
	Metal binding	440	1	Iron-sulfur (4Fe-4S) By similarity
	Metal binding	479	1	Iron-sulfur (4Fe-4S) By similarity
	Metal binding	483	1	Iron (siroheme axial ligand) By similarity
	Metal binding	483	1	Iron-sulfur (4Fe-4S) By similarity

Sequences

	Sequence		Length	Mass (Da)
	B1IU78-1 [UniParc]. Last modified April 29, 2008. Version 1. Checksum: 4728279022CA433F	FASTA	570	63,990
	10 20 30 40 50 60 MSEKHPGPLV VEGKLTDAER MKLESNYLRG TIAEDLNDGL TGGFKGDNFL LIRFHGMYQQ 70 80 90 100 110 120 DDRDIRAERA EQKLEPRHAM LLRCRLPGGV ITTKQWQAID KFAGENTIYG SIRLTNRQTF 130 140 150 160 170 180 QFHGILKKNV KPVHQMLHSV GLDALATAND MNRNVLCTSN PYESQLHAEA YEWAKKISEH 190 200 210 220 230 240 LLPRTRAYAE IWLDQEKVAT TDEEPILGQT YLPRKFKTTV VIPPQNDIDL HANDMNFVAI 250 260 270 280 290 300 AENGKLVGFN LLVGGGLSIE HGNKKTYART ASEFGYLPLE HTLAVAEAVV TTQRDWGNRT 310 320 330 340 350 360 DRKNAKTKYT LERVGVETFK AEVERRAGIK FEPIRPYEFT GRGDRIGWVK GIDDNWHLTL 370 380 390 400 410 420 FIENGRILDY PGRPLKTGLL EIAKIHKGDF RITANQNLII AGVPESEKAK IEKIAKESGL 430 440 450 460 470 480 MNAVTPQREN SMACVSFPTC PLAMAEAERF LPSFIDNIDN LMAKHGVSDE HIVMRVTGCP 490 500 510 520 530 540 NGCGRAMLAE VGLVGKAPGR YNLHLSGNRI GTRIPRMYKE NITEPEILAS LDELIGRWAK 550 560 570 EREAGEGFGD FTVRAGIIRP VLDPARDLWD

References

[1]

"Complete sequence of Escherichia coli C str. ATCC 8739." Copeland A., Lucas S., Lapidus A., Glavina del Rio T., Dalin E., Tice H., Bruce D., Goodwin L., Pitluck S., Kiss H., Brettin T., Detter J.C., Han C., Kuske C.R., Schmutz J., Larimer F., Land M., Hauser L. , Kyrpides N., Mikhailova N., Ingram L., Richardson P. Submitted (FEB-2008) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBL GenBank DDBJ	CP000946 Genomic DNA. Translation: ACA76618.1.
RefSeq	YP_001723945.1.
3D structure databases
SMR	B1IU78. Positions 81-570.
ModBase	Search...
Genome annotation databases
GeneID	6068350.
GenomeReviews	Gene locus EcolC_0949 in contig CP000946_GR.
KEGG	ecl:EcolC_0949.
Organism-specific databases
CMR	Search...
Phylogenomic databases
HOGENOM	HBG626671.
OMA	PGDNSVD.
Family and domain databases
HAMAP	MF_01540. CysI. [Tree]
InterPro	IPR011786. CysI. IPR005117. NiRdtase/SiRdtase_haem-b_fer. IPR006067. NO2/SO3_Rdtase_4Fe4S_dom. IPR006066. NO2/SO3_Rdtase_FeS/sirohaem_BS. [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_ECOLC

Accession

Primary (citable) accession number: B1IU78

Entry history

Integrated into UniProtKB/Swiss-Prot:	May 20, 2008
Last sequence update:	April 29, 2008
Last modified:	February 9, 2010
This is version 16 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)