Q31R12 (PETN_SYNE7) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
Cytochrome b6-f complex subunit 8

Alternative name(s):
Cytochrome b6-f complex subunit PetN
Cytochrome b6-f complex subunit VIII

Gene names

Name:	petN
Ordered Locus Names:	Synpcc7942_0475

Organism

Synechococcus elongatus (strain PCC 7942) (Anacystis nidulans R2) [Complete proteome] [HAMAP]

Taxonomic identifier

1140 [NCBI]

Taxonomic lineage

cellular organisms › Bacteria › Cyanobacteria › Oscillatoriophycideae › Chroococcales › Synechococcus › Synechococcus elongatus

Protein attributes

Sequence length	34 AA.
Sequence status	Complete.
Protein existence	Inferred from homology

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. HAMAP-Rule MF_00395
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	Cellular thylakoid membrane; Single-pass membrane protein By similarity HAMAP-Rule MF_00395.
Sequence similarities	Belongs to the PetN family.
Sequence caution	The sequence ABB56507.1 differs from that shown. Reason: Erroneous initiation.

Ontologies

Keywords
Biological process	Electron transport Photosynthesis Transport
Cellular component	Membrane Thylakoid
Domain	Transmembrane Transmembrane helix
Technical term	Complete proteome
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	cytochrome b6f complex Inferred from electronic annotation. Source: InterPro integral to membrane Inferred from electronic annotation. Source: UniProtKB-KW thylakoid membrane Inferred from electronic annotation. Source: UniProtKB-SubCell
Molecular_function	electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II 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
	Chain	1 – 34	34	Cytochrome b6-f complex subunit 8 HAMAP-Rule MF_00395		PRO_5000100996
Regions
	Transmembrane	3 – 23	21	Helical; Potential

Sequences

	Sequence		Length	Mass (Da)
	Q31R12 [UniParc]. Last modified November 25, 2008. Version 2. Checksum: 4A1E41863D4EB2D2	FASTA	34	3,678
	10 20 30 MELLTFGWAA LLAVFTFSLA MVVWGRNGDG SIGF

References

[1]

"Complete sequence of chromosome 1 of Synechococcus elongatus PCC 7942." US DOE Joint Genome Institute Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina T., Hammon N., Israni S., Pitluck S., Schmutz J., Larimer F., Land M., Kyrpides N., Lykidis A., Richardson P. Submitted (AUG-2005) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: PCC 7942.

Cross-references

Sequence databases
EMBL GenBank DDBJ	CP000100 Genomic DNA. Translation: ABB56507.1. Different initiation.
RefSeq	YP_399494.1. NC_007604.1.
3D structure databases
ProteinModelPortal	Q31R12.
SMR	Q31R12. Positions 3-28.
ModBase	Search...
Protein-protein interaction databases
STRING	1140.Synpcc7942_0475.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Genome annotation databases
EnsemblBacteria	ABB56507; ABB56507; Synpcc7942_0475.
GeneID	3773421.
KEGG	syf:Synpcc7942_0475.
Organism-specific databases
CMR	Search...
Phylogenomic databases
HOGENOM	HOG000252217.
KO	K03689.
ProtClustDB	PRK02529.
Enzyme and pathway databases
BioCyc	MetaCyc:SYNPCC7942_0475-MONOMER. SELO1140:GJWQ-482-MONOMER.
Family and domain databases
HAMAP	MF_00395. Cytb6_f_PetN.
InterPro	IPR005497. Cytochrome_b6-f_cplx_su8. [Graphical view]
Pfam	PF03742. PetN. 1 hit. [Graphical view]
SUPFAM	SSF103451. PetN. 1 hit.
ProtoNet	Search...

Entry information

Entry name

PETN_SYNE7

Accession

Primary (citable) accession number: Q31R12

Entry history

Integrated into UniProtKB/Swiss-Prot:	November 25, 2008
Last sequence update:	November 25, 2008
Last modified:	May 1, 2013
This is version 49 of the entry and version 2 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program