P69461 (PETG_SPIOL) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
Cytochrome b6-f complex subunit 5

Alternative name(s):
Cytochrome b6-f complex subunit PetG
Cytochrome b6-f complex subunit V

Gene names

Name:	petG
Synonyms:	petE

Encoded on

Plastid; Chloroplast

Organism

Spinacia oleracea (Spinach)

Taxonomic identifier

3562 [NCBI]

Taxonomic lineage

cellular organisms › Eukaryota › Viridiplantae › Streptophyta › Streptophytina › Embryophyta › Tracheophyta › Euphyllophyta › Spermatophyta › Magnoliophyta › eudicotyledons › core eudicotyledons › Caryophyllales › Amaranthaceae › Spinacia

Protein attributes

Sequence length	37 AA.
Sequence status	Complete.
Protein existence	Evidence at protein 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. PetG is required for either the stability or assembly of the cytochrome b6-f complex By similarity. HAMAP-Rule MF_00432
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 HAMAP-Rule MF_00432.
Sequence similarities	Belongs to the PetG family.

Ontologies

Keywords
Biological process	Electron transport Photosynthesis Transport
Cellular component	Chloroplast Membrane Plastid Thylakoid
Domain	Transmembrane Transmembrane helix
Technical term	Direct protein sequencing
Gene Ontology (GO)
Biological_process	cytochrome complex assembly Inferred from electronic annotation. Source: HAMAP electron transport chain Inferred from electronic annotation. Source: UniProtKB-KW photosynthesis Inferred from electronic annotation. Source: UniProtKB-KW
Cellular_component	chloroplast thylakoid membrane Inferred from electronic annotation. Source: UniProtKB-SubCell cytochrome b6f complex Inferred from electronic annotation. Source: InterPro integral to membrane Inferred from electronic annotation. Source: UniProtKB-KW
Molecular_function	electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II 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 – 37	37	Cytochrome b6-f complex subunit 5 HAMAP-Rule MF_00432		PRO_0000216405
Regions
	Transmembrane	5 – 25	21	Helical; Potential
Experimental info
	Sequence conflict	15	1	P → G AA sequence Ref.3
	Sequence conflict	20	1	G → P in CAA52449. Ref.1

Sequences

	Sequence		Length	Mass (Da)
	P69461 [UniParc]. Last modified March 15, 2005. Version 1. Checksum: A98EA4D30CB983C5	FASTA	37	4,170
	10 20 30 MIEVFLFGIV LGLIPITLAG LFVTAYLQYR RGDQLDL

References

	« Hide 'large scale' referencesShow 'large scale' references »
[1]	Oelmueller R. Submitted (JUL-1993) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]. Strain: cv. Monatol. Tissue: Seedling.
[2]	"The plastid chromosome of spinach (Spinacia oleracea): complete nucleotide sequence and gene organization." Schmitz-Linneweber C., Maier R.M., Alcaraz J.-P., Cottet A., Herrmann R.G., Mache R. Plant Mol. Biol. 45:307-315(2001) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: cv. Geant d'hiver and cv. Monatol.
[3]	"Low molecular weight subunits associated with the cytochrome b6f complexes from spinach and Chlamydomonas reinhardtii." Schmidt C.L., Malkin R. Photosyn. Res. 38:73-81(1993) Cited for: PROTEIN SEQUENCE OF 1-20.

Cross-references

Sequence databases
EMBL GenBank DDBJ	X74430 Genomic DNA. Translation: CAA52449.1. AJ400848 Genomic DNA. Translation: CAB88747.1.
RefSeq	NP_054954.1. NC_002202.1.
3D structure databases
ModBase	Search...
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Genome annotation databases
GeneID	2715600.
Phylogenomic databases
ProtClustDB	CHL00008.
Family and domain databases
HAMAP	MF_00432. Cytb6_f_PetG.
InterPro	IPR003683. Cyt_6/f_cplx_su5. [Graphical view]
Pfam	PF02529. PetG. 1 hit. [Graphical view]
PIRSF	PIRSF000034. Cyt_b6-f_V. 1 hit.
SUPFAM	SSF103446. Cytochrmb6/f_5. 1 hit.
ProtoNet	Search...

Entry information

Entry name

PETG_SPIOL

Accession

Primary (citable) accession number: P69461
Secondary accession number(s): P12121, P32973

Entry history

Integrated into UniProtKB/Swiss-Prot:	March 15, 2005
Last sequence update:	March 15, 2005
Last modified:	April 3, 2013
This is version 36 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Plant Protein Annotation Program