Übersetzung für 'Q-cycle' von Englisch nach Deutsch

Q-cycle

Q-Zyklus {m}biochem.

• The Q cycle is a process that occurs in cytochrome b, a component of Complex III in the electron transport chain, and that converts ubiquinol to ubiquinone in a cyclic fashion.
• The Q cycle (named for "quinol") describes a series of reactions that describe how the sequential oxidation and reduction of the lipophilic electron carrier, Coenzyme Q (CoQ), between the ubiquinol and ubiquinone forms, can result in the net movement of protons across a lipid bilayer (in the case of the mitochondria, the inner mitochondrial membrane).
• Mechanisms are based on energy-induced conformational changes of the protein structure or on the Q cycle.
• Mitochondrial "Complex III" uses this second type of proton pump, which is mediated by a quinone (the Q cycle).