Complex II, or succinate dehydrogenase, receives electrons from FADH2 but does not contribute to proton pumping. This process, known as chemiosmotic coupling, links electron transport directly to ATP synthesis.
Electron Transport Chain ATP Production Efficiency: Maximizing Cellular Energy Output
This mechanical rotation drives conformational changes in the F1 subunit, catalyzing the phosphorylation of ADP to ATP. High ATP concentrations inhibit key enzymes, slowing the cycle when energy is abundant.
5 ATP molecules, while one FADH2 yields about 1. Complex III, cytochrome bc1 complex, and Complex IV, cytochrome c oxidase, continue the electron relay while actively transporting protons into the intermembrane space.
Electron Transport Chain ATP Production Efficiency: Maximizing Cellular Energy Output
Complex I, also known as NADH dehydrogenase, accepts electrons from NADH and pumps protons across the membrane. Core Components of the Electron Transport Chain The electron transport chain consists of four major protein complexes (I, II, III, and IV) and two mobile electron carriers (ubiquinone and cytochrome c).
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