A0A7S6UA11 · A0A7S6UA11_9STRA
- ProteinCytochrome b6
- GenepetB
- StatusUniProtKB unreviewed (TrEMBL)
- Organism
- 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 | ||||
Sequence: C | ||||||
Binding site | 86 | Fe (UniProtKB | ChEBI) of heme b 2 (UniProtKB | ChEBI); axial binding residue | ||||
Sequence: H | ||||||
Binding site | 100 | Fe (UniProtKB | ChEBI) of heme b 1 (UniProtKB | ChEBI); axial binding residue | ||||
Sequence: H | ||||||
Binding site | 187 | Fe (UniProtKB | ChEBI) of heme b 2 (UniProtKB | ChEBI); axial binding residue | ||||
Sequence: H | ||||||
Binding site | 202 | Fe (UniProtKB | ChEBI) of heme b 1 (UniProtKB | ChEBI); axial binding residue | ||||
Sequence: H |
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
- Organism
- Taxonomic lineageEukaryota > Sar > Stramenopiles > Ochrophyta > PX clade > Schizocladia
Accessions
- Primary accessionA0A7S6UA11
Subcellular Location
UniProt Annotation
GO Annotation
Membrane ; Multi-pass membrane protein
Plastid, chloroplast thylakoid membrane ; Multi-pass membrane protein
Features
Showing features for transmembrane.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Transmembrane | 31-58 | Helical | ||||
Sequence: NIFYCFGGIVLTCFLVQVATGFAMTFYY | ||||||
Transmembrane | 88-106 | Helical | ||||
Sequence: WSASMMVLMLILHIFRVYL | ||||||
Transmembrane | 118-138 | Helical | ||||
Sequence: WVTGVILAVTTVSFGVTGYSL | ||||||
Transmembrane | 184-206 | Helical | ||||
Sequence: YSAHTFVLPLVAAVLLLTHFLMI |
Keywords
- Cellular component
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
Family & Domains
Features
Showing features for domain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Domain | 4-215 | Cytochrome b/b6 N-terminal region profile | ||||
Sequence: VYDWLEERLEIQSIADDITSKYVPPHVNIFYCFGGIVLTCFLVQVATGFAMTFYYRPSVSEAFASVEYIMTEVNFGWLIRSIHRWSASMMVLMLILHIFRVYLTGGFKKPRELTWVTGVILAVTTVSFGVTGYSLPWDQVGFWACKIVTGVPEAVPILGPPIVQLLRGGVSVGQSTLTRFYSAHTFVLPLVAAVLLLTHFLMIRKQGISGPL |
Sequence similarities
Belongs to the cytochrome b family. PetB subfamily.
Keywords
- Domain
Family and domain databases
Sequence
- Sequence statusComplete
- Length215
- Mass (Da)24,048
- Last updated2021-06-02 v1
- ChecksumDD35E36046E65332