Literature summary extracted from
Zhou, F.; Yin, Y.; Su, T.; Yu, L.; Yu, C.A.
Oxygen dependent electron transfer in the cytochrome bc complex (2012), Biochim. Biophys. Acta, 1817, 2103-2109.
Activating Compound
EC Number |
Activating Compound |
Comment |
Organism |
Structure |
---|
7.1.1.8 |
O2 |
molecular oxygen increases the activity of Rhodobacter sphaeroides bc1 complex up to 82%, depending on the intactness of the complex. Since oxygen enhances the reduction rate of heme bL, but shows no effect on the reduction rate of heme bH, the effect of oxygen in the electron transfer sequence of the cytochrome bc1 complex is at the step of heme bL reduction during bifurcated oxidation of ubiquinol. Free superoxide anion is not involved in the oxygen enhanced reduction of heme bL |
Cereibacter sphaeroides |
|
Protein Variants
EC Number |
Protein Variants |
Comment |
Organism |
---|
7.1.1.8 |
H111N |
site-directed mutagenesis, the rate of heme bL reduction in the H111N mutant complex increases in the presence of oxygen, no altered effect of superoxide dismutase on the oxygen increased rate of heme bL reduction in the H111N mutant complex compaired to the wild-type enzyme, overview |
Cereibacter sphaeroides |
KM Value [mM]
EC Number |
KM Value [mM] |
KM Value Maximum [mM] |
Substrate |
Comment |
Organism |
Structure |
---|
7.1.1.8 |
additional information |
- |
additional information |
pre-steady state reduction rate of cytochrome bL in bc1 complex by ubiquinol and effect of oxygen on the kinetics, overview |
Cereibacter sphaeroides |
|
Metals/Ions
EC Number |
Metals/Ions |
Comment |
Organism |
Structure |
---|
7.1.1.8 |
Fe2+ |
Rieske iron-sulfur protein possessing a high potential [2Fe-2S] cluster |
Cereibacter sphaeroides |
|
Natural Substrates/ Products (Substrates)
EC Number |
Natural Substrates |
Organism |
Comment (Nat. Sub.) |
Natural Products |
Comment (Nat. Pro.) |
Rev. |
Reac. |
---|
7.1.1.8 |
ubiquinol + 2 ferricytochrome c |
Cereibacter sphaeroides |
- |
ubiquinone + 2 ferrocytochrome c + 2 H+ |
- |
? |
|
Organism
EC Number |
Organism |
UniProt |
Comment |
Textmining |
---|
7.1.1.8 |
Cereibacter sphaeroides |
- |
- |
- |
Substrates and Products (Substrate)
EC Number |
Substrates |
Comment Substrates |
Organism |
Products |
Comment (Products) |
Rev. |
Reac. |
---|
7.1.1.8 |
ubiquinol + 2 ferricytochrome c |
- |
Cereibacter sphaeroides |
ubiquinone + 2 ferrocytochrome c + 2 H+ |
- |
? |
|
Subunits
EC Number |
Subunits |
Comment |
Organism |
---|
7.1.1.8 |
More |
all the bc1 complexes contain three redox prosthetic group bearing subunits (cytochrome b, cytochrome c1, and Rieske iron-sulfur protein) with varying numbers (ranging from 0 to 8) of non-redox prosthetic group bearing (supernumerary) subunits |
Cereibacter sphaeroides |
Cofactor
EC Number |
Cofactor |
Comment |
Organism |
Structure |
---|
7.1.1.8 |
cytochrome b |
the cytochrome b subunit contains two b-type hemes, bL and bH |
Cereibacter sphaeroides |
|
7.1.1.8 |
cytochrome c1 |
the cytochrome c1 subunit carries a c-type heme (c1) |
Cereibacter sphaeroides |
|
7.1.1.8 |
additional information |
all the bc1 complexes contain three redox prosthetic group bearing subunits (cytochrome b, cytochrome c1, and Rieske iron-sulfur protein) with varying numbers (ranging from 0 to 8) of non-redox prosthetic group bearing (supernumerary) subunits |
Cereibacter sphaeroides |
|
General Information
EC Number |
General Information |
Comment |
Organism |
---|
7.1.1.8 |
physiological function |
the cytochrome bc1 complex is an essential energy transduction electron transfer complex in photosynthetic bacteria. This complex catalyzes the electron transfer from ubiquinol to cytochrome c (or c2) with concomitant generation of a proton gradient and membrane potential for ATP synthesis by the ATP synthase complex |
Cereibacter sphaeroides |