P83795 (PETL_MASLA) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
Cytochrome b6-f complex subunit 6

Alternative name(s):
Cytochrome b6-f complex subunit PetL
Cytochrome b6-f complex subunit VI

Gene names

Name:

petL

Organism

Mastigocladus laminosus (Fischerella sp.)

Taxonomic identifier

83541 [NCBI]

Taxonomic lineage

cellular organisms › Bacteria › Cyanobacteria › Stigonematales › Mastigocladus

Protein attributes

Sequence length	32 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. PetL is important for photoautotrophic growth as well as for electron transfer efficiency and stability of the cytochrome b6-f complex. HAMAP-Rule MF_00433
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.
Subcellular location	Cellular thylakoid membrane; Single-pass membrane protein HAMAP-Rule MF_00433.
Sequence similarities	Belongs to the PetL family.

Ontologies

Keywords
Biological process	Electron transport Photosynthesis Transport
Cellular component	Membrane Thylakoid
Domain	Transmembrane Transmembrane helix
Technical term	3D-structure
Gene Ontology (GO)
Biological_process	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: HAMAP
Complete GO annotation...

Sequence annotation (Features)

Feature key

Position(s)

Length

Description

Graphical view

Feature identifier

Molecule processing

Chain

1 – 32

32

Cytochrome b6-f complex subunit 6 HAMAP-Rule MF_00433

PRO_0000220486

Regions

Transmembrane

6 – 26

21

Helical; Potential

Secondary structure

1

.

.

.

.

32

Helix Strand Turn

Details...

Helix

2 – 23

22

Turn

24 – 28

5

Sequences

	Sequence		Length	Mass (Da)
	P83795 [UniParc]. Last modified March 15, 2004. Version 1. Checksum: B9C10271C3DE499F	FASTA	32	3,502
	10 20 30 MILGAVFYIV FIALFFGIAV GIIFAIKSIK LI

References

[1]	"Structure of the cytochrome b6f complex of oxygenic photosynthesis: tuning the cavity." Kurisu G., Zhang H., Smith J.L., Cramer W.A. Science 302:1009-1014(2003) [PubMed] [Europe PMC] [Abstract] Cited for: X-RAY CRYSTALLOGRAPHY (3.0 ANGSTROMS).
+	Additional computationally mapped references.

Cross-references

3D structure databases

PDBe
RCSB PDB
PDBj

Entry	Method	Resolution (Å)	Chain	Positions	PDBsum
1VF5	X-ray	3.00	E/R	1-32	[»]
2D2C	X-ray	3.80	E/R	1-32	[»]
2E74	X-ray	3.00	E	1-32	[»]
2E75	X-ray	3.55	E	1-32	[»]
2E76	X-ray	3.41	E	1-32	[»]
4H0L	X-ray	3.25	E	1-32	[»]
4H13	X-ray	3.07	E	1-32	[»]

ProteinModelPortal

P83795.

SMR

P83795. Positions 1-32.

ModBase

Search...

Protocols and materials databases

StructuralBiologyKnowledgebase

Search...

Family and domain databases

HAMAP

MF_00433. Cytb6_f_PetL.

InterPro

IPR007802. Cyt_b6/f_cplx_su6.
[Graphical view]

ProtoNet

Search...

Other

EvolutionaryTrace

P83795.

Entry information

Entry name

PETL_MASLA

Accession

Primary (citable) accession number: P83795

Entry history

Integrated into UniProtKB/Swiss-Prot:	May 10, 2004
Last sequence update:	March 15, 2004
Last modified:	April 3, 2013
This is version 41 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program