A0A1L5YCG6 · A0A1L5YCG6_9EUKA

  • Protein
    Cytochrome b6
  • Gene
    petB
  • Status
    UniProtKB unreviewed (TrEMBL)
  • Amino acids
  • Protein existence
    Inferred from homology
  • Annotation score
    3/5

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:
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.

121820406080100120140160180200
TypeIDPosition(s)Description
Binding site38heme c (UniProtKB | ChEBI); covalent
Binding site89Fe (UniProtKB | ChEBI) of heme b 2 (UniProtKB | ChEBI); axial binding residue
Binding site103Fe (UniProtKB | ChEBI) of heme b 1 (UniProtKB | ChEBI); axial binding residue
Binding site190Fe (UniProtKB | ChEBI) of heme b 2 (UniProtKB | ChEBI); axial binding residue
Binding site205Fe (UniProtKB | ChEBI) of heme b 1 (UniProtKB | ChEBI); axial binding residue

GO annotations

AspectTerm
Cellular Componentplastid
Cellular Componentthylakoid 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
    • Synonyms
      MYN1_Chr_570
    • ORF names
      PCKR_632
      , PFK_632
      , PMYN1_Chma581

Encoded on

  • Plastid

Organism names

  • Taxonomic identifier
  • Organism
  • Strains
    • FK01
    • KR01
    • MYN1
  • Taxonomic lineage
    Eukaryota > Sar > Rhizaria > Cercozoa > Imbricatea > Silicofilosea > Euglyphida > Paulinellidae > Paulinella

Accessions

  • Primary accession
    A0A1L5YCG6

Proteomes

Subcellular Location

Cellular thylakoid membrane
; Multi-pass membrane protein
Membrane
; Multi-pass membrane protein

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane35-61Helical
Transmembrane91-109Helical
Transmembrane121-141Helical
Transmembrane147-165Helical
Transmembrane186-209Helical

Keywords

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.

Family & Domains

Features

Showing features for domain.

TypeIDPosition(s)Description
Domain7-218Cytochrome b/b6 N-terminal region profile

Sequence similarities

Belongs to the cytochrome b family. PetB subfamily.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    218
  • Mass (Da)
    24,643
  • Last updated
    2017-03-15 v1
  • MD5 Checksum
    FCCF678E64A63D3946E45DFEB41EF7C6
MANSSPIYDWFQERLEIQAIADDISSKYVPPHVNIFYCLGGITLTCFLIQFATGFAMTFYYKPTVAEAYSSVQYLMTDVSFGWLIRSIHRWSASMMVLMLILHVFRVYLTGGFKRPRELTWVTGVTMAVITVSFGVTGYSLPWDQVGYWAVKIVSGVPAAIPVVGDFMVELLRGGESVGQSTLTRFYSLHTFVMPWLLAVFMLMHFLMIRKQGISGPL

Keywords

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
KX897545
EMBL· GenBank· DDBJ
APP88405.1
EMBL· GenBank· DDBJ
Genomic DNA
KY124271
EMBL· GenBank· DDBJ
AQX45172.1
EMBL· GenBank· DDBJ
Genomic DNA
LC490351
EMBL· GenBank· DDBJ
BBL86389.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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