Q69GY7 (UCRIA_SOLTU) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
Cytochrome b6-f complex iron-sulfur subunit, chloroplastic
EC=1.10.99.1

Alternative name(s):
Plastohydroquinone:plastocyanin oxidoreductase iron-sulfur protein
Rieske iron-sulfur protein
Short name=ISP
Short name=RISP

Gene names

Name:

petC

Organism

Solanum tuberosum (Potato)

Taxonomic identifier

4113 [NCBI]

Taxonomic lineage

Eukaryota › Viridiplantae › Streptophyta › Embryophyta › Tracheophyta › Spermatophyta › Magnoliophyta › eudicotyledons › core eudicotyledons › asterids › lamiids › Solanales › Solanaceae › Solanoideae › Solaneae › Solanum

Protein attributes

Sequence length	230 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is further processed into a mature form.
Protein existence	Evidence at transcript level

General annotation (Comments)

Function	Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions By similarity.
Catalytic activity	Plastoquinol-1 + 2 oxidized plastocyanin = plastoquinone + 2 reduced plastocyanin.
Cofactor	Binds 1 2Fe-2S cluster per subunit By similarity.
Subunit structure	The 4 large subunits of the cytochrome b6-f complex are cytochrome b6, subunit IV (17 kDa polypeptide, petD), cytochrome f and the Rieske protein, while the 4 small subunits are petG, petL, petM and petN. The complex functions as a dimer By similarity.
Subcellular location	Plastid › chloroplast thylakoid membrane; Single-pass membrane protein By similarity. Note: The transmembrane helix obliquely spans the membrane in one monomer, and its extrinsic C-terminal domain is part of the other monomer By similarity.
Miscellaneous	This protein is 1 of 2 subunits of the cytochrome b6-f complex that are encoded in the nucleus. The Rieske iron-sulfur protein is a high potential 2Fe-2S protein.
Sequence similarities	Contains 1 Rieske domain.

Ontologies

Keywords
Biological process	Electron transport Transport
Cellular component	Chloroplast Membrane Plastid Thylakoid
Domain	Transit peptide Transmembrane Transmembrane helix
Ligand	2Fe-2S Iron Iron-sulfur Metal-binding
Molecular function	Oxidoreductase
PTM	Disulfide bond
Gene Ontology (GO)
Biological process	electron transport chain Inferred from electronic annotation. Source: UniProtKB-KW photosynthesis Inferred from electronic annotation. Source: InterPro
Cellular component	chloroplast thylakoid membrane Inferred from electronic annotation. Source: UniProtKB-SubCell integral to membrane Inferred from electronic annotation. Source: UniProtKB-KW
Molecular function	2 iron, 2 sulfur cluster binding Inferred from electronic annotation. Source: UniProtKB-KW electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity Inferred from electronic annotation. Source: InterPro metal ion binding Inferred from electronic annotation. Source: UniProtKB-KW plastoquinol-plastocyanin reductase activity Inferred from electronic annotation. Source: EC ubiquinol-cytochrome-c reductase activity Inferred from electronic annotation. Source: InterPro
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Transit peptide	1 – 25	25	Chloroplast Potential
	Chain	26 – 230	205	Cytochrome b6-f complex iron-sulfur subunit, chloroplastic		PRO_0000030692
Regions
	Transmembrane	73 – 93	21	Helical; Potential
	Domain	117 – 213	97	Rieske
Sites
	Metal binding	159	1	Iron-sulfur (2Fe-2S) By similarity
	Metal binding	161	1	Iron-sulfur (2Fe-2S); via pros nitrogen By similarity
	Metal binding	177	1	Iron-sulfur (2Fe-2S) By similarity
	Metal binding	180	1	Iron-sulfur (2Fe-2S); via pros nitrogen By similarity
Amino acid modifications
	Disulfide bond	164 ↔ 179		By similarity

Sequences

	Sequence		Length	Mass (Da)
	Q69GY7 [UniParc]. Last modified September 13, 2004. Version 1. Checksum: 5E3E314E06E4FDCF	FASTA	230	24,267
	10 20 30 40 50 60 MASSTLSHVT PSQLCSSKSG VSSVSQALLV KPMKINGHGM GKDKRMKAKC MAASIPADDR 70 80 90 100 110 120 VPDMEKRNLM NLLLLGALAL PTGGMLVPYA TFFAPPGSGG GSSGTIAKDA NGNDVVVTEW 130 140 150 160 170 180 LKTHSPGTRT LTQGLKGDPT YLVVENDGTL ATYGINAVCT HLGCVVPWNT AENKFICPCH 190 200 210 220 230 GSQYNNQGKV VRGPAPLSLA LAHADIDDGK VVFVPWVETD FRTGDSPWWA

References

[1]	"Import and processing of the precursor of the Rieske FeS protein of potato chloroplasts." Feng J., He L., Xu J. Submitted (MAY-2003) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [MRNA].

Cross-references

Sequence databases
EMBL GenBank DDBJ	AY300039 mRNA. Translation: AAQ90151.1.
3D structure databases
ProteinModelPortal	Q69GY7.
SMR	Q69GY7. Positions 63-230.
ModBase	Search...
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Family and domain databases
InterPro	IPR014909. Cyt_b6-f_cplx_Fe-S_su. IPR023960. Cyt_b6_f_Rieske. IPR017941. Rieske_2Fe-2S. IPR014349. Rieske_Fe-S_prot. IPR005805. Rieske_Fe-S_prot_C. [Graphical view]
Gene3D	G3DSA:2.102.10.10. Rieske_reg. 1 hit.
PANTHER	PTHR10134. Rieske. 1 hit.
Pfam	PF08802. CytB6-F_Fe-S. 1 hit. PF00355. Rieske. 1 hit. [Graphical view]
PRINTS	PR00162. RIESKE.
SUPFAM	SSF50022. Rieske_dom. 1 hit.
PROSITE	PS51296. RIESKE. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

UCRIA_SOLTU

Accession

Primary (citable) accession number: Q69GY7

Entry history

Integrated into UniProtKB/Swiss-Prot:	July 5, 2005
Last sequence update:	September 13, 2004
Last modified:	October 19, 2011
This is version 52 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Plant Protein Annotation Program