Q8S8W0 · CYB6_ATRBE

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:
heme b (UniProtKB | Rhea| CHEBI:60344 )

Note: Binds 2 heme b groups non-covalently with two histidine residues as axial ligands.
heme c (UniProtKB | Rhea| CHEBI:61717 )

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.

121520406080100120140160180200
TypeIDPosition(s)Description
Binding site35heme c (UniProtKB | ChEBI); covalent
Binding site86Fe (UniProtKB | ChEBI) of heme b 2 (UniProtKB | ChEBI); axial binding residue
Binding site100Fe (UniProtKB | ChEBI) of heme b 1 (UniProtKB | ChEBI); axial binding residue
Binding site187Fe (UniProtKB | ChEBI) of heme b 2 (UniProtKB | ChEBI); axial binding residue
Binding site202Fe (UniProtKB | ChEBI) of heme b 1 (UniProtKB | ChEBI); axial binding residue

GO annotations

AspectTerm
Cellular Componentchloroplast thylakoid membrane
Molecular Functionelectron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity
Molecular Functionmetal ion binding
Molecular Functionoxidoreductase activity
Biological Processphotosynthesis
Biological Processrespiratory electron transport chain

Keywords

Names & Taxonomy

Protein names

  • Recommended name
    Cytochrome b6

Gene names

    • Name
      petB

Encoded on

  • Chloroplast

Organism names

  • Taxonomic identifier
  • Strain
    • cv. Ab5p(kan)
  • Taxonomic lineage
    Eukaryota > Viridiplantae > Streptophyta > Embryophyta > Tracheophyta > Spermatophyta > Magnoliopsida > eudicotyledons > Gunneridae > Pentapetalae > asterids > lamiids > Solanales > Solanaceae > Solanoideae > Hyoscyameae > Atropa

Accessions

  • Primary accession
    Q8S8W0

Subcellular Location

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane32-52Helical
Transmembrane90-110Helical
Transmembrane116-136Helical
Transmembrane186-206Helical

Keywords

PTM/Processing

Features

Showing features for chain.

TypeIDPosition(s)Description
ChainPRO_00000617831-215Cytochrome 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

Family & Domains

Sequence similarities

Belongs to the cytochrome b family. PetB subfamily.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    215
  • Mass (Da)
    24,151
  • Last updated
    2002-06-01 v1
  • Checksum
    40E39AC14395D26A
MSKVYDWFEERLEIQAIADDITSKYVPPHVNIFYCLGGITLTCFLVQVATGFAMTFYYRPTVTEAFASVQYIMTEANFGWLIRSVHRWSASMMVLMMILHVFRVYLTGGFKKPRELTWVTGVVLAVLTASFGVTGYSLPWDQIGYWAVKIVTGVPDAIPVIGSPLVELLRGSASVGQSTLTRFYSLHTFVLPLLTAVFMLMHFPMIRKQGISGPL

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AJ316582
EMBL· GenBank· DDBJ
CAC88074.1
EMBL· GenBank· DDBJ
Genomic DNA

Genome annotation databases

Similar Proteins

Disclaimer

Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. Our staff consists of biologists and biochemists that are not trained to give medical advice.
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