Chapter 20 7th edition.ppt - Electron Transport Chain and...

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Electron Transport Chain and Oxidative Phosphorylation Electron transport chain: -takes place on the inner mitochondrial membrane -protons are transported across the membrane against the conc. gradient -4 enzyme complexes
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4 enzyme complexes: -oxidation/reduction transfers -final destination of e - is to O 2 to form water -Energy from e - transfer pushes H + across the inner membrane into in inner membrane space -flow of H + back across to the matrix produces ATP -ATP synthase complex catalyzes the production of ATP Oxidative Phosphorylation: -separate from the electron transport chain -endergonic process -electron transport chain: a series of exergonic reactions pushes H + across the membrane creating a proton gradient The two processes electron transport chain and oxidative phosphorylation are coupled
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NADH and FADH 2 are fed into the electron transport chain; They are oxidized back to FAD and NAD to be reused
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How to determine reducing potential: Carriers in the transport chain can be oxidized or reduced, so how do you know which carrier will be oxidized and which one will be reduced? Which direction does the electron transport chain flow? Each carrier has its own reducing potential The carrier with the higher reduction potential will be reduced
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Electron Transport Complex I : NADH-CoQ oxidoreductase
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