Activating Compound | Comment | Organism | Structure |
---|---|---|---|
additional information | the bf complex, however, can be dark-activated via reduction of heme cn by ferredoxin | Rhodobacter capsulatus |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
(E)-beta-methoxyacrylate stilbene | weak inhibition, retards concurrently the flashinduced re-reduction of cytochrome f, the oxidation of cytochrome b6 and the onset of voltage generation, thereby hardly affecting the rate of the flash-induced cytochrome b6 reduction and the steady turnover of the bf | Rhodobacter capsulatus | |
2-n-Nonyl-4-hydroxyquinoline N-oxide | weak inhibition, retards concurrently the flashinduced re-reduction of cytochrome f, the oxidation of cytochrome b6 and the onset of voltage generation, thereby hardly affecting the rate of the flash-induced cytochrome b6 reduction and the steady turnover of the bf | Rhodobacter capsulatus |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
membrane | - |
Rhodobacter capsulatus | 16020 | - |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Zn2+ | concurrent action of Zn2+ ions on the re-reduction of cytochrome c1 by the Rieske protein, voltage generation, and proton release from the bc1 | Rhodobacter capsulatus |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
plastoquinol + 2 oxidized plastocyanin + 2 H+[side 1] | Rhodobacter capsulatus | - |
plastoquinone + 2 reduced plastocyanin + 2 H+[side 2] | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Rhodobacter capsulatus | - |
- |
- |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
plastoquinol + 2 oxidized plastocyanin + 2 H+[side 1] | - |
Rhodobacter capsulatus | plastoquinone + 2 reduced plastocyanin + 2 H+[side 2] | - |
? |
Subunits | Comment | Organism |
---|---|---|
dimer | - |
Rhodobacter capsulatus |
Synonyms | Comment | Organism |
---|---|---|
cytochrome b6 f complex | - |
Rhodobacter capsulatus |
quinol:plastocyanin oxidoreductase | - |
Rhodobacter capsulatus |
General Information | Comment | Organism |
---|---|---|
evolution | cytochrome bc1-complexes of animals and bacteria, as well as related cytochrome b6 f complexes of plants and cyanobacteria are dimeric quinol:cytochrome c/plastocyanin oxidoreductases capable of translocating protons across energy-converting membranes. These enzymes oxidize two quinolmolecules in their catalytic centers P to yield one quinol molecule in another catalytic center N. The simplest cytochrome bc1-complexes of Rhodobacter capsulatus, which contains only 3 subunits, matches the structure of the three catalytic subunits of mitochondrial bc1 | Rhodobacter capsulatus |
additional information | Q-cycle in the cytochrome bc1 complex using the X-ray structure of the three catalytic subunits of a dimeric bc1 of phototrophic bacteria, i.e. the X-ray structure of the bc1 of Rhodobacter sphaeroides, PDB entry 2QJY, modificationss of Mitchell's Q-cycle, detailed overview | Rhodobacter capsulatus |
physiological function | the subunit IV binds single molecules of chlorophyll alpha and beta-carotene, which are likely to be involved in photoprotection | Rhodobacter capsulatus |