The enzyme thiolase catalyzes one step in the ß-oxidation of saturated fats. One portion of the mechanism for this reaction is shown below. Describe the catalytic mechanism at work. (Note: "SCOA" is shorthand for the compound Acetyl-CoA) RCOCH₂COSCOA + HSCOA → H3C₂OSC0A + RCOSCOA
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- Examine the ActiveModel for alcohol dehydrogenase and describe the structure and function of the catalytic zinc center.The Reactions and Meehanisms of the Leloir Pathway Write the reactions that permit galactose to be utilized in glycolysis. Write a suitable mechanism, tor one of these reactions.Based on your knowledge of the structure of NAD+ and an assumption that coenzyme dissociation is the rate limiting step of the alcohol dehydrogenase mechanism, hypothesize why a N249W mutation at the coenzyme binding site would increase the rate of catalysis.
- 9. The equation below depicts the first step of the citric acid cycle. H0 CoA-SH CH-C + 0=C-CO0 HO C-COO citrate s-COA ČH2-COO synthase ČH2 -CO0 Citrate Acetyl-CoA Oxaloacetate AG" = -32.2 kJ/mol a) Explain the chemical conversions that take place during this step. b) Why is this reaction energetically favorable? Explain.The following reaction is a vitamin B12-dependent reaction that proceeds via a mechanism analogous to that of the methylmalonyl-CoA mutase reaction. H Н4 H 1 H3N 2 H `H H HO b H H5 Identify which atoms in the product(s) correspond to the numbered atoms in the reactant. Atom a corresponds to atom Atom b corresponds to atom Atom c corresponds to atomThe complete oxidation of palmitoyl-CoA to carbon dioxide and water is presented by the overall equation: Palmitoyl-CoA + 23O2 + 108Pi + 108 ATP + 23H2O → CoA + 16 CO2 + 108 ATP + 23H2O Water is also produced in the reaction ADP + Pi → ATP + H2O But not included as a product in the overall equation. Why?
- asapDraw the structures of the following coenzyme molecules: 1. CoA-SH/Acetyl-S-CoA 2. NAD*/NADH + H* • For both: Give full name (if you copy the formula from an Internet source, please cite it properly, for example, according to the Chicago Manual of Style. • Indicate what are the chemical groups that are active in these molecules, i.e., what group participates in metabolic reactions (be aware that both molecules may be involved in both anabolic and catabolic processes). • What vitamin or vitamins will, when modified, contribute to the structure of these molecules? • Write a short, general conclusion of the importance of these two coenzymes in metabolism.Fatty acids are converted to their coenzyme A esters in a reversible reaction catalyzed by acyl-CoA synthetase: R-COO +ATP +COA R-C-COA +AMP + PPi a) The reaction involves two steps the first of which forms an enzyme-bound intermediate identified as the mixed anhydride of the fatty acid and AMP: R-C-O-P-O-nibose-adenine Write two chemical equations coresponding to the two steps of the reaction catalyzed by the synthetase. b) The acyl-CoA synthetase reaction as written above is readily reversible. How might the reaction be made to favor formation of fatty acyl-CoA? Write within the box. Anything outside the box will not be graded. From the
- 33. Which of the following statements is true for the shown reaction? P-O-CH₂ P-O-CH₂ OH A Coo I C=O HOTHS CH₂ Coo A HỌ он D A. The reaction is catalyzed by PFK-1 B. Stimulation of the reaction eventually slows down gluconeogenesis C. Inhibition of glyceraldehyde 3-phopshate dehydrogenase leads to the accumulation of the product B D. All of the above E. None of the above OH 34. Which of the following statements is true for the shown reaction? COO™ CH₂OH HQ -℗ B CH₂ B C-o-℗ + CO₂ A. Insulin can eventually inhibit the reaction B. The reaction only take place in the presence of acetyl-CoA C. The product B is a high-energy molecule, and the next logical step is to use the energy released from B to synthesize ATP D. All of above E. None of the aboveConsider docosanoic acid C12H43CO2H a. Label the alpha and beta Carbons. Show the beta-oxidation in an EXPANDED structure. b. Draw each acyl CoA derived from this fatty acid. c. How many acetyl Co A molecules are formed by complete beta-oxidation? d. How many cycles of beta-oxidation are needed for complete oxidation? e. How many molecules of ATP are formed from the complete catabolism of this fatty acid? Show the complete computation. f. How many moles of ATP per gram of fatty acid is formed from the complete catabolism of the given fatty acid? g. What is the molar mass of the given fatty acid? Solution: Show here the complete computations, [from a to e]Below is an image of the Krebs cycle: acetyl-CoA oxaloacetate COASH H20 NADH NAD* H20 malate citrate fumarate isocitrate FADH2 NAD* CO2 FAD АТР NADH + ADP succinate GTP NAD+ a-ketoglutarate H20 GDP NADH + CO2 COASH succinyl CoA COASH Consider the conversion of succinate to fumarate, which is coupled with the production the electron carrier FADH2. If this reaction was NOT coupled with the production of FADH2 (and only catalyzed the conversion of succinate to fumarate), how would this impact ATP production through cell respiration? OATP production would stop because no high energy electron carriers would be produced ATP production would still occur, but there would be a much lower ATP yield because a large number of electron carriers are no longer being made ATP production would stop because without FADH2 we will no longer have electrons moving through the electron transport chain ATP production would still occur, but there would be a slightly lower ATP yield because a small number of…