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Literature summary for 7.1.1.8 extracted from

  • Cape, J.L.; Bowman, M.K.; Kramer, D.M.
    Reaction intermediates of quinol oxidation in a photoactivatable system that mimics electron transfer in the cytochrome bc1 complex (2005), J. Am. Chem. Soc., 127, 4208-4215.
    View publication on PubMed
Search for more literature for 7.1.1.8

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
additional information
-
 additional information kinetics Bos taurus

Localization

Localization Comment Organism GeneOntology No. Textmining
mitochondrion
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 Bos taurus 5739
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Organism

Organism UniProt Comment Textmining
Bos taurus
-
-
-

Reaction

Reaction Comment Organism Reaction ID
quinol + 2 ferricytochrome c = quinone + 2 ferrocytochrome c + 2 H+[side 2] current competing models for the two-electron oxidation of quinol QH2 at the cytochrome bc1 complex and related complexes impose distinct requirements for the reaction intermediate, the initial and rate-limiting step in quinol oxidation, both in the biological and biomimetic systems, involves electron and proton transfer, probably via a proton-coupled electron-transfer mechanism, a neutral semiquinone intermediate is formed in the biomimetic system, and oxidation of the QH*/QH2 couple for UQH2-0, but not TMQH2-0, exhibits an unusual and unexpected primary deuterium kinetic isotope effect on its Arrhenius activation energy, DELTA GTS, where DELTA GTS for the protiated form is larger than that for the deuterated form, detailed reaction mechanism, molecular modeling, electrochemical and computational study, overview Bos taurus
a

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
additional information the cyt bc1 complex uses ubiquinol, but not plastoquinol, as a substrate, usage of a biomimetic oxidant, excited-state Ru(2,2'-dipyridyl)2(2-(2-pyridyl)benzimidazolate)+ in an aprotic medium to probe the oxidation of the ubiquinol analogue, 2,3-dimethoxy-5-methyl-1,4-benzoquinol, i.e. UQH2-0, and the plastoquinol analogue, trimethyl-1,4-benzoquinol, i.e. TMQH2-0, using time-resolved and steady-state spectroscopic techniques, comparison of isotope-dependent activation properties in the native and synthetic systems as well as analysis of the time-resolved direct-detection electron paramagnetic resonance signals in the synthetic system, overview Bos taurus ?
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 ?
ubiquinol-2 + 2 ferricytochrome c
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 Bos taurus ubiquinone-2 + 2 ferrocytochrome c + 2 H+
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 ?

Subunits

Subunits Comment Organism
More structure modeling and analysis, overview Bos taurus

Synonyms

Synonyms Comment Organism
Cyt bc1 complex
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 Bos taurus
cytochrome bc1 complex
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 Bos taurus
UQH2
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 Bos taurus