ExPASy Proteomics Server

Accession	MF_00433
Dates	1-JUN-2001 (Created) 25-NOV-2009 (Last updated, Version 33)

Data class

Protein

Predictors

HAMAP; MF_00433; [distribution of match scores in UniProtKB];[seed alignment for MF_00433]

Names

Cytb6_f_PetL

Identifier

PETL

Protein name

RecName: Full=Cytochrome b6-f complex subunit 6; AltName: Full=Cytochrome b6-f complex subunit VI; AltName: Full=Cytochrome b6-f complex subunit petL;

Gene name

petL

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. PetL is important for photoautotrophic growth as well as for electron transfer efficiency and stability of the cytochrome b6-f complex (By similarity).

SUBUNIT: 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).

SUBCELLULAR LOCATION: Cell inner membrane; Single-pass membrane protein (By similarity).

SUBCELLULAR LOCATION: Cellular thylakoid membrane; Single-pass membrane protein (By similarity).

SIMILARITY: Belongs to the petL family.

Pfam	PF05115; PetL; 1;
General	Transmembrane; -; 1; trigger=Yes;

Transport, Photosynthesis, Electron transport, Membrane, Transmembrane.

Cell membrane, Cell inner membrane.

Thylakoid.

GO:0045158; Molecular function: electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity.
GO:0055114; Biological process: oxidation reduction.

GO:0009535; Cellular component: chloroplast thylakoid membrane.

GO:0005886; Cellular component: plasma membrane.

GO:0042651; Cellular component: thylakoid membrane.

Size range:	28-43 amino acids
Related UniRules:	None
Template:	P50369 (PETL_CHLRE); P83795 (PETL_MASLA): [Recover all]
Scope:	Bacteria; Cyanobacteria Plastid
Fusion:	Nter: None; Cter: None
Duplicate:	None
Plasmid encoded:	None
Comments:	Subject to RNA editing in many seed plants; the start and stop codons are created by RNA editing in all conifers examined so far. Is essential in C. reinhardtii, but not required for photosynthesis in N. tabacum. Additionally, some cyanobacteria, for example Synechocystis, do not have this protein.