Q8M9Z4 · CYB6_CHAGL
- ProteinCytochrome b6
- GenepetB
- StatusUniProtKB reviewed (Swiss-Prot)
- Amino acids215 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
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.
Miscellaneous
Heme 1 (or BH or b566) is high-potential and absorbs at about 566 nm, and heme 2 (or BL or b562) is low-potential and absorbs at about 562 nm.
Cofactor
Protein has several cofactor binding sites:
Note: Binds 2 heme b groups non-covalently with two histidine residues as axial ligands.
Note: Binds one heme group covalently by a single cysteine link with no axial amino acid ligand. This heme was named heme ci.
Features
Showing features for binding site.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Binding site | 35 | heme c (UniProtKB | ChEBI); covalent | |||
Binding site | 86 | Fe (UniProtKB | ChEBI) of heme b 2 (UniProtKB | ChEBI); axial binding residue | |||
Binding site | 100 | Fe (UniProtKB | ChEBI) of heme b 1 (UniProtKB | ChEBI); axial binding residue | |||
Binding site | 187 | Fe (UniProtKB | ChEBI) of heme b 2 (UniProtKB | ChEBI); axial binding residue | |||
Binding site | 202 | Fe (UniProtKB | ChEBI) of heme b 1 (UniProtKB | ChEBI); axial binding residue | |||
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | chloroplast thylakoid membrane | |
Molecular Function | electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity | |
Molecular Function | metal ion binding | |
Molecular Function | oxidoreductase activity | |
Biological Process | photosynthesis | |
Biological Process | respiratory electron transport chain |
Keywords
- Biological process
- Ligand
Names & Taxonomy
Protein names
- Recommended nameCytochrome b6
Gene names
Encoded on
- Chloroplast
Organism names
- Strain
- Taxonomic lineageEukaryota > Viridiplantae > Streptophyta > Coleochaetophyceae > Coleochaetales > Chaetosphaeridiaceae > Chaetosphaeridium
Accessions
- Primary accessionQ8M9Z4
Subcellular Location
UniProt Annotation
GO Annotation
Plastid, chloroplast thylakoid membrane ; Multi-pass membrane protein
Features
Showing features for transmembrane.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Transmembrane | 32-52 | Helical | |||
Transmembrane | 90-110 | Helical | |||
Transmembrane | 116-136 | Helical | |||
Transmembrane | 186-206 | Helical | |||
Keywords
- Cellular component
PTM/Processing
Features
Showing features for chain.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Chain | PRO_0000061785 | 1-215 | Cytochrome b6 | ||
Interaction
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.
Structure
Sequence
- Sequence statusComplete
- Length215
- Mass (Da)24,231
- Last updated2002-10-01 v1
- Checksum2879F90589E0DDFA
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
AF494278 EMBL· GenBank· DDBJ | AAM96527.1 EMBL· GenBank· DDBJ | Genomic DNA |