CH369.lecture13.3-12-2009

CH369.lecture13.3-12-2009 - Food digestion and energy...

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Unformatted text preview: Food digestion and energy production Glucose 2 puruvte CO 2 +H 2 O Energy (ATP) Anaerobic aerobic glycolysis CAC 1 8 4 38 Food ATP synthesis C o u p l e d o x i d a t i v e p h o s p h o r y l a t i o n U n c o u p l e d o x i d a t i v e p h o s p h o r y l a t i o n Heat production Heat production • Hibernating animals • Human babies Brown fat Pharmaceutical application • Uncoupling of oxidative phosphorylation is accomplished by a protein called uncoupling protein (UCP1) • UCP1 is shown to be able to reduce body weight. Why do we need O 2 ? Oxidative phosphorylation • In metabolic pathways, including glycolysis and the citric acid cycle, metabolic fuels were oxidized. • Reduced cofactors NADH and ubiquinol (QH ) generated Oxidative phosphorylation differs from the conventional biochemical reactions • ATP synthesis is not directly coupled to a single discrete chemical reaction • Oxidative phosphorylation is a more indirect process in which free energy is temporarily stored, or conserved, in the form of a gradient of protons before being used to drive ATP synthesis. Oxidative phosphorylation. Oxidative phosphorylation differs from the conventional biochemical reactions • ATP synthesis is not directly coupled to a single discrete chemical reaction; • Oxidative phosphorylation is a more indirect process in which free energy is stored in the form of a H + gradient before being used to drive ATP synthesis . • http://edugen.wiley.com/edugen/domain/d mn2469 Review of redox reactions • Reduction and oxidation reaction occur concomitant. • CH 4 + 2O 2 CO 2 + 2H 2 O + HEAT methane oxygen carbon dioxide water energy • Redox reactions frequently involve changes in bonds to oxygen – Oxidation: an increase in the number of bonds to oxygen – Reduction: a decrease in the number of bonds to oxygen • Redox reactions are electron transfer reactions...
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This note was uploaded on 04/03/2009 for the course CH 369 taught by Professor Kbrowning during the Spring '07 term at University of Texas at Austin.

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CH369.lecture13.3-12-2009 - Food digestion and energy...

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