P0C360 (PSAC_ORYSI) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
Photosystem I iron-sulfur center
EC=1.97.1.12

Alternative name(s):
9 kDa polypeptide
PSI-C
Photosystem I subunit VII
PsaC

Gene names

Name:	psaC
ORF Names:	9311169

Encoded on

Plastid; Chloroplast

Organism

Oryza sativa subsp. indica (Rice)

Taxonomic identifier

39946 [NCBI]

Taxonomic lineage

Eukaryota › Viridiplantae › Streptophyta › Embryophyta › Tracheophyta › Spermatophyta › Magnoliophyta › Liliopsida › Poales › Poaceae › BEP clade › Ehrhartoideae › Oryzeae › Oryza

Protein attributes

Sequence length	81 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is further processed into a mature form.
Protein existence	Inferred from homology

General annotation (Comments)

Function	Apoprotein for the two 4Fe-4S centers FA and FB of photosystem I (PSI); essential for photochemical activity. FB is the terminal electron acceptor of PSI, donating electrons to ferredoxin. The C-terminus interacts with psaA/B/D and helps assemble the protein into the PSI complex. Required for binding of psaD and psaE to PSI. PSI is a plastocyanin-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. HAMAP MF_01303
Catalytic activity	Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin. HAMAP MF_01303
Cofactor	Binds 2 4Fe-4S clusters. Cluster 2 is most probably the spectroscopically characterized electron acceptor FA and cluster 1 is most probably FB By similarity.
Subunit structure	The eukaryotic PSI reaction center is composed of at least 11 subunits By similarity.
Subcellular location	Plastid › chloroplast thylakoid membrane; Peripheral membrane protein; Stromal side By similarity HAMAP MF_01303.
Sequence similarities	Contains 2 4Fe-4S ferredoxin-type domains.

Ontologies

Keywords
Biological process	Electron transport Photosynthesis Transport
Cellular component	Chloroplast Membrane Photosystem I Plastid Thylakoid
Domain	Repeat
Ligand	4Fe-4S Iron Iron-sulfur Metal-binding
Molecular function	Oxidoreductase
Gene Ontology (GO)
Biological process	photosynthetic electron transport in photosystem I Inferred from electronic annotation. Source: InterPro transport Inferred from electronic annotation. Source: UniProtKB-KW
Cellular component	chloroplast thylakoid membrane Inferred from electronic annotation. Source: UniProtKB-SubCell photosystem I Inferred from electronic annotation. Source: UniProtKB-KW
Molecular function	4 iron, 4 sulfur cluster binding Inferred from electronic annotation. Source: UniProtKB-KW electron carrier activity Inferred from electronic annotation. Source: InterPro metal ion binding Inferred from electronic annotation. Source: UniProtKB-KW oxidoreductase activity Inferred from electronic annotation. Source: UniProtKB-KW
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Initiator methionine	1	1	Removed By similarity
	Chain	2 – 81	80	Photosystem I iron-sulfur center HAMAP MF_01303		PRO_0000288986
Regions
	Domain	2 – 31	30	4Fe-4S ferredoxin-type 1
	Domain	39 – 68	30	4Fe-4S ferredoxin-type 2
Sites
	Metal binding	11	1	Iron-sulfur 1 (4Fe-4S) By similarity
	Metal binding	14	1	Iron-sulfur 1 (4Fe-4S) By similarity
	Metal binding	17	1	Iron-sulfur 1 (4Fe-4S) By similarity
	Metal binding	21	1	Iron-sulfur 2 (4Fe-4S) By similarity
	Metal binding	48	1	Iron-sulfur 2 (4Fe-4S) By similarity
	Metal binding	51	1	Iron-sulfur 2 (4Fe-4S) By similarity
	Metal binding	54	1	Iron-sulfur 2 (4Fe-4S) By similarity
	Metal binding	58	1	Iron-sulfur 1 (4Fe-4S) By similarity

Sequences

	Sequence		Length	Mass (Da)
	P0C360 [UniParc]. Last modified May 29, 2007. Version 1. Checksum: 681F63DC8FC603BF	FASTA	81	8,899
	10 20 30 40 50 60 MSHSVKIYDT CIGCTQCVRA CPTDVLEMIP WDGCKAKQIA SAPRTEDCVG CKRCESACPT 70 80 DFLSVRVYLG PETTRSMALS Y

References

[1]	"A comparison of rice chloroplast genomes." Tang J., Xia H., Cao M., Zhang X., Zeng W., Hu S., Tong W., Wang J., Wang J., Yu J., Yang H., Zhu L. Plant Physiol. 135:412-420(2004) [PubMed: 15122023] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: cv. 93-11.

Cross-references

Sequence databases
EMBL GenBank DDBJ	AY522329 Genomic DNA. Translation: AAS46093.1.
RefSeq	YP_654253.1. NC_008155.1.
3D structure databases
ProteinModelPortal	P0C360.
ModBase	Search...
Proteomic databases
PRIDE	P0C360.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Genome annotation databases
EnsemblPlants	LOC_Os06g46436.1; LOC_Os06g46436.1; LOC_Os06g46436. LOC_Os07g22498.1; LOC_Os07g22498.1; LOC_Os07g22498. LOC_Os10g21406.1; LOC_Os10g21406.1; LOC_Os10g21406. LOC_Osp1g00920.1; LOC_Osp1g00920.1; LOC_Osp1g00920.
GeneID	4126910.
Organism-specific databases
Gramene	P69414.
Phylogenomic databases
HOGENOM	HBG284509.
ProtClustDB	CHL00065.
Family and domain databases
HAMAP	MF_01303. PSI_PsaC. [Tree]
InterPro	IPR001450. 4Fe4S-bd_dom. IPR017896. 4Fe4S_Fe-S-bd. IPR017900. 4Fe4S_Fe_S_CS. IPR017491. PSI_PsaC. [Graphical view]
Pfam	PF12838. Fer4_7. 1 hit. [Graphical view]
TIGRFAMs	TIGR03048. PS_I_psaC. 1 hit.
PROSITE	PS00198. 4FE4S_FER_1. 2 hits. PS51379. 4FE4S_FER_2. 2 hits. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

PSAC_ORYSI

Accession

Primary (citable) accession number: P0C360
Secondary accession number(s): P10794 , P69414, Q6QXX3, Q6QY36

Entry history

Integrated into UniProtKB/Swiss-Prot:	May 29, 2007
Last sequence update:	May 29, 2007
Last modified:	January 25, 2012
This is version 29 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Plant Protein Annotation Program