Reviewed, UniProtKB/Swiss-Prot A3N3D8 (CYSI_ACTP2)

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:	APL_1842

Organism

Actinobacillus pleuropneumoniae serotype 5b (strain L20) [Complete proteome] [HAMAP]

Taxonomic identifier

416269 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Gammaproteobacteria › Pasteurellales › Pasteurellaceae › Actinobacillus

Protein attributes

Sequence length	588 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 – 588	588	Sulfite reductase [NADPH] hemoprotein beta-component		PRO_1000068756
Sites
	Metal binding	442	1	Iron-sulfur (4Fe-4S) By similarity
	Metal binding	448	1	Iron-sulfur (4Fe-4S) By similarity
	Metal binding	487	1	Iron-sulfur (4Fe-4S) By similarity
	Metal binding	491	1	Iron (siroheme axial ligand) By similarity
	Metal binding	491	1	Iron-sulfur (4Fe-4S) By similarity

Sequences

	Sequence		Length	Mass (Da)
	A3N3D8-1 [UniParc]. Last modified April 3, 2007. Version 1. Checksum: 3CBA5BBE72775200	FASTA	588	66,761
	10 20 30 40 50 60 MSDKKIKGLE WQEKPLSDNE RLKTDSNFLR GTILDDLKDD LTGGFKGDNF QLIRFHGMYE 70 80 90 100 110 120 QDDRDIRAER LEEKLEPLKF MLLRCRLPGG IIKPYQWIEI DKFAREHTRY QSIRLTNRQT 130 140 150 160 170 180 FQYHGVPKGK LQPMHRLLHS IGLDSIATAA DMNRNVLCTS NPIESELHQQ AYEFAKKISE 190 200 210 220 230 240 HLLPRSRGYL DVWVDGKKVE SSDDLLKIED EPILGKTYLP RKFKTAVAIP PLNDVDVYAN 250 260 270 280 290 300 DLNFIAIQDE NGQLCGFNVL VGGGLSFEHG NTKTYPNVAY SLGFVPLEHT LAAAEGVVKT 310 320 330 340 350 360 QRDFGNRSDR KNARVRYTVQ NMTLDGFRAE VERCMNIKFE PTRPYEFTER GDRIGWVKGI 370 380 390 400 410 420 DNNWHLTLFI ESVRITDKPE KPLMTGVLEL AKVHKGDFRI TANQNLIVAN VAEQDKAQIE 430 440 450 460 470 480 AIARQYGLIQ EISKLRENAM SCVSLPTCPL AMAEAERVLP DFISELDKVL SKHNVADESI 490 500 510 520 530 540 ITRITGCPNG CGRAMLAEIG LVGKAIGRYN LHIGGDRAGL RISRLYKENI TLQEIVNEID 550 560 570 580 QLVARWATER QTNEAFGDFV IRSNIIAPVV NAHIDFWDAT KIIPTTII

References

[1]	"The complete genome sequence of Actinobacillus pleuropneumoniae L20 (serotype 5b)." Foote S.J., Bosse J.T., Bouevitch A.B., Langford P.R., Young N.M., Nash J.H.E. J. Bacteriol. 190:1495-1496(2008) [PubMed: 18065534] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	CP000569 Genomic DNA. Translation: ABN74924.1.
RefSeq	YP_001054529.1.
3D structure databases
ModBase	Search...
Genome annotation databases
GeneID	4848697.
GenomeReviews	Gene locus APL_1842 in contig CP000569_GR.
KEGG	apl:APL_1842.
Organism-specific databases
CMR	Search...
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_ACTP2

Accession

Primary (citable) accession number: A3N3D8

Entry history

Integrated into UniProtKB/Swiss-Prot:	February 5, 2008
Last sequence update:	April 3, 2007
Last modified:	November 25, 2008
This is version 15 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)