Catalysis by the enzyme glyceraldehyde 3-phosphate dehydrogenase does NOT involve oxidation and phosphorylation of the substrate. phosphorylation of the substrate using ATP. an active site histidine to serve as a proton acceptor. a covalent intermediate.
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On the other hand, acyl phosphates, such as 1,3-bisphosphoglycerate, are more stable and undergo further enzyme-catalyzed transformation in cells. Predict the effects on the net reaction catalyzed by glyceraldehyde 3-phosphate dehydrogenase and other reactions of glycolysis if phosphate was replaced by arsenate. The 1,3-bisphosphoglycerate intermediate would decompose nonenzymatically, so no NADH would be formed in the reaction. There would be no net conversion of ADP to ATP from the conversion of glucose to pyruvate during glycolysis. Gluconeogenesis would be inhibited by arsenate because glyceraldehyde 3-phosphate dehydrogenase is also an enzyme in that pathway. The 3-phosphoglycerate intermediate would decompose nonenzymatically, so no ATP would be formed in the phosphoglycerate kinase reaction. By substituting for phosphate in this reaction, the arsenate-containing compounds would inhibit several downstream reactions.
Reema C.
Why is oxidation catalyzed by glyceraldehyde 3-phosphate dehydrogenase spontaneous? Acyl-phosphate formation is promoted by inorganic phosphate by increasing the phosphoryl-transfer potential. The free energy of the thioester intermediate is lower than that of GAP, NAD+, and H2O. The thioester intermediate is more stable than 1,3-BPG. The free energy of the thioester intermediate is higher than that of GAP, NAD+, and H2O. The free energy of the thioester intermediate is lower than that of 1,3-BPG.
Sri K.
2. Glyceraldehyde 3-phosphate dehydrogenase. Reaction 6 of glycolysis, the glyceraldehyde 3-phosphate dehydrogenase reaction, oxidizes and phosphorylates glyceraldehyde 3-phosphate, forming 1,3-bisphosphoglycerate. The enzyme active site sulfur atom (from a cysteine residue) and the substrate are shown below. "R" represents the rest of the enzyme. a) A nucleophilic attack leads to the formation of a covalent tetrahedral intermediate. Highlight the atom that acts as a nucleophile and atom that acts as electrophile.
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