Lipid Metabolism

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Lipid Metabolism • Lipid nomenclature • Oxidation of Fatty acids • β-oxidation • Ketone Bodies Lipid nomenclature • Fatty acids • triacylglycerols: know structure • phospholipids • waxes • sphingolipids • Glycosphingolipids • Isoprenoids • Steriods • Nomenclature • saturated: palmitate, stearate, no double bonds • unsaturated: palmitoleate, Oleate: double bond at cis 9 position • polyunsaturated • Melting points: saturated vs unsaturated Oxidation of Fatty acids • Know equation for palmitate: C16H32O + O2 ---> CO2 + H2O • Comparison of glucose with palmitate for ATP production and energy yield • Mobilization of Triacylglycerols from adipose tissue – hormonal control: glucagon, epinephrine – lipases – transport by lipoproteins – fate of glycerol • transport into cytoplasm of cell Digestion of lipid in diet • Triacylglycerols from diet • broken down in small intestine • lipases • bile salts • transport to adipose tissue Mobilization of Triacylglycerols – hormonal control of lipolysis: glucagon, epinephrine – lipases – transport by lipoproteins – transport into cytoplasm of cell – Insulin inhibits lipolysis Breakdown of triacylglycerides fate of glycerol β-oxidation • occurs in mitochondria • uses FAD and NAD • produces acetyl CoA acyl CoA synthetase • two step reaction • ATP + FA ---> AMP-FA • AMP-FA + CoASH ------> FA-CoA + AMP Transport into mitochondria • Carnitine shuttle • CAT I/II • Translocase reaction β-oxidation •AcylCoA dehydrogenase • enoyl-CoA hydratase • L-hydroxyacyl dehydrogenase • ketoacyl-CoA thiolase • Repeat steps Summary of Reactions Energy production • NADH and FADH from B-oxidation • TCA cycle from acetyl CoA • Total net yield is minus 2 ATP from activation Oxidation of Unsaturated Fatty acids • New enzymes • enoyl CoA isomerase • 2,4 dienoyl-CoA reductase Unsaturated Fatty acids Oxidation of odd chain fatty acids • form propionyl CoA • produce succinyl CoA Ketone Bodies • Acetoacetate • Acetone • B-hyroxybutyrate •HMG CoA synthase Ketone bodies and diabetes.

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