What type of reaction is catalyzed by these complexes? Describe the role of dihydrolipoamide dehydrogenase in these reactions.
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The enzyme, dihydrolipoamide dehydrogenase is present in both pyruvate dehydrogenase complex and α-ketoglutarate dehydrogenase complex. What type of reaction is catalyzed by these complexes? Describe the role of dihydrolipoamide dehydrogenase in these reactions.
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- What are the similarities and differences between the reactions catalyzed by pyruvate dehydrogenase and a-ketoglutarate dehydrogenase?Pyruvate dehydrogenase complex and α -ketoglutarate dehydrogenase complex are huge enzymes consisting of three discrete enzymatic activities. Which amino acids require a related enzyme complex, and what is the name of the enzyme?Identify the Krebs cycle enzyme that consumes a 3-carbon substrate molecule, producing a 2- carbon product molecule (attached to acetyl-CoA), along with NADH, and one molecule of CO2. succinyl CoA synthetase a-ketoglutarate dehydrogenase pyruvate dehydrogenase isocitrate dehydrogenase malate dehydrogenase
- Which of the following is NOT a component of the pyruvate dehydrogenase complex? a. dihydrolipoyl dehydrogenase b. dihydrolipoyl transacetylase c. pyruvate dehydrogenase d. dihydrolipoyl catalaseThe conversion of glyceraldehyde-3-phosphate to 1,3-bisphosphoglycerate is the only oxidative reaction of glycolysis. True or false?What are the effects of Glucose-6 Phosphate Dehydrogenase Deficiency? Explain its mechanism of action.
- fatty acid breakdown generates a large amount of acetyl CoA. What will be the effect of fatty acid breakdown on pyruvate dehydrogenase complex activity? On glycolysis?How similar of an effect would a mutation in pyruvate dehydrogenase have, compared to a mutation in pyruvate carboxylase that blocks its ability to be regulated by acetyl-CoA?Which enzyme involved in the TCA cycle produces very similar outcomes compared to pyruvate dehydrogenase ?
- Briefly describe the biological rationale for each of the following allosteric phenomena: (a) activation of pyruvate carboxylase by acetyl-CoA; (b) activation of pyruvate dehydrogenase kinase by NADH; (c) inhibition of isocitrate dehydrogenase by NADH; (d) activation of isocitrate dehydrogenase by ADP; (e) inhibition of α-ketoglutarate dehydrogenase by succinyl-CoA; (f) activation of pyruvate dehydrogenase phosphatase by Ca2 +.Which of the following citric acid cycle enzymes catalyzes substrate-level phosphorylation? A) isocitrate dehydrogenase B) α-ketoglutarate dehydrogenase C) succinyl CoA synthetase D) succinate dehydrogenase E) malate dehydrogenaseWhich of the following enzymes possesses a catalytic mechanism extremely similar to that of the Pyruvate Dehydrogenase Complex? A. the isocitrate dehydrogenase B. the succinate dehydrogenase C. the alpha-ketoglutarate dehydrogenase D. the malate dehydrogenase