Mitochondrial beta-oxidation of a fully saturated 18-carbon-long (linear) fatty acyl-CoA produces what? O9 acetyl-CoA, 10 NADH, and 10 FADH2 8 acetyl-CoA, 9 NADH, and 8 FADH2 O9 acetyl-CoA, 8 NADH, and 8 FADH2 O9 acetyl-CoA, 9 NADH, and 9 FADH
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- Ethanol as a Source of Metabolic Energy (Integrates with Chapters 19 and 20.) Acetate produced in ethanol metabolism can be transformed into acetyl-COA by the acetyl thiokinase reaction: Acetate+ATP+CoASHacetyleCoA+AMP+PPiAcetyle-CoA then can enter the citric acid cycle and undergo oxidation to 2 CO2by this route, assuming oxidative phosphorylation is part of the process? (Assume all reactions prior to acetyl-CoA entering the citric acid cycle occur outside the mitochondrion). Per carbon atom, which is a better metabolic fuel, ethanol or glucose? That is, how many ATP equivalents per carbon atom are generated by combustion of glucose versus ethanol to CO2?Understanding the Mechanism of the HMC-CoA Synthase Reaction Write a suitable mechanism for the HMG-CoA synthase reaction. What is the chemistry that drives this condensation reaction?Extending the Mechanism of Methylmalonyl-CoA Mutase to Similar Reactions Based on the mechanism for the methylmalonyl-CoA mutase (see problem 14), write reasonable mechanisms for the following reactions shown.
- Consider the complete oxidation of one mole of the fatty acyl CoA of capric acid (10:0). Determine the following: rounds of β-oxidation total no. of acetyl CoA produced total no. of NADH produced from all rounds of β-oxidation total no. of FADH2 produced from all rounds of β-oxidation total no. of NADH produced from the oxidation of all acetyl CoA in the TCA cycle total no. of FADH2 produced from the oxidation of all acetyl CoA in the TCA cycle total ATP yieldThe synthesis of the activated form of acetate (acetyl-CoA) is carried out in an ATP-dependent process: Acetate + CoA + ATP → acetyl-CoA + AMP + PPi (a) The ∆G’o for the hydrolysis of acetyl-CoA to acetate and CoA is - 32.2 kJ/mol and that for hydrolysis of ATP to AMP and PPi is - 30.5 kJ/mol. Calculate ∆G’o for the ATP-dependent synthesis of acetyl-CoA. (b) Almost all cells contain the enzyme inorganic pyrophosphatase, which catalyzes the hydrolysis of PPi to Pi. What effect does the presence of this enzyme have on the synthesis of acetyl-CoA? Explain.If oxidation of acetyl-CoA yields 10 ATPs per mole through the citric acidcycle, how many ATPs will be derived from the complete metabolic oxidation of 1 mole of alanine in a mammal? Would the corresponding energyyield in a fish be higher or lower? Why? How much energy would bederived from the metabolic oxidation of 1 mole of isoleucine to CO2, H2O,and NH3? Of tyrosine?
- How many molecules of ATP are released in the overall catabolism of glycerol to acetyl-CoA? How many molecules of ATP are released in the complete catabolism of glycerol to CO2 and H2O? (Hint: Combine pathways ofglycerol to DHAP with glycolysis from DHAP to pyruvate and pyruvate to acetyl-CoA. Remember to account for any NADH and FADH2 produced.)Synthesis of the activated form of acetate (acetyl-CoA) is carried out in an ATP-dependent process:(a) The ΔG′° for hydrolysis of acetyl-CoA to acetate and CoA is −32.2 kJ/mol and that for hydrolysis of ATP to AMP and PPi is −30.5 kJ/mol. Calculate ΔG′° for the ATPdependent synthesis of acetyl-CoA.(b) Almost all cells contain the enzyme inorganic pyrophosphatase, which catalyzes the hydrolysis of PPi to Pi. What effect does the presence of this enzyme have on the synthesis of acetyl-CoA? Explain.Calculate the number of ATPs generated from the metabolic oxidation of the four carbons of acetoacetyl-CoA to CO2. Now consider the homolog derived from oxidation of an odd-numbered carbon chain, namely, propionoacetyl- CoA. Calculate the net ATP yield from oxidation of the five carbons of this compound to CO2.
- Calculate the number of ATPs generated from the metabolic oxidation of the four carbons of acetoacetyl-CoA to CO2. Now consider the homolog derived from oxidation of an odd-numbered carbon chain, namely, propionoacetyl-CoA. Calculate the net ATP yield from oxidation of the five carbons of this compound to CO2.The mitochondrial Pyruvate Dehydrogenase Complex (PDC) is a very large enzyme complex which catalyses the oxidative decarboxylation of pyruvate to acetyl-CoA. Describe the enzyme components that make up the PDC, indicating the contribution each makes to the pyruvate to acetyl-CoA process, as well as how the PDC itself is regulated by intermediates?How many reduced molecules (NADH, FADH2, NADPH) will be generated by converting lineoleic acid (18:2Δ9,12) to acetyl-CoA?