19_Electron_Transport-1

19_Electron_Transport-1 - XIX. Ellectron Transport Chaiin...

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0B X X X I I I X X X . . . E E E l l l e e e c c c t t t r r r o o o n n n T T T r r r a a a n n n s s s p p p o o o r r r t t t C C C h h h a a a i i i n n n The vast majority of the energy derived from the breakdown of the foodstuffs is captured by the cell in the reactions of the electron transport chain. In a nutshell, the hydrogen atoms captured by NADH during glycolysis or Krebs cycle are split into electrons and protons across the inner mitochondrial membrane. This charge separation is accomplished in a series of redox reactions, which gradually transform energy of reduced NADH and create electrical and H+ gradients. 3B C C C h h h e e e m m m i i i o o o s s s m m m o o o s s s i i i s s s
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The inner mitochondrial membrane contains redox enzymes catalyzing successive reduction/oxidation reactions, which separate electrons and protons across the inner mitochondrial membrane. The redox reactions can be thought of as a series of shuttling events in which hydrogens are transported from inside the mitochondrion to the intermembrane space but only electrons (not protons) are carried back on a return journey, stranding the H+ in the intermembrane space. The redox enzymes that catalyze the charge separation can be broadly classified as hydrogen or electron carriers depending on the species carried across the membrane. Hydrogen carriers use FMN or CoQ as a coenzyme binding hydrogen atoms.
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This document was uploaded on 11/02/2011 for the course BIO bsc2010 at FSU.

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19_Electron_Transport-1 - XIX. Ellectron Transport Chaiin...

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