What reaction is catalyzed by pyruvate kinase? Question 2 options: Enzymatic reduction of pyruvate to glycerol 3-phosphate. Enzymatic transfer of a phosphate group from phosphoenolpyruvate to adenosine diphosphate yielding pyruvate and adenosine triphosphate. Enzymatic conversion of pyruvate to acetyl-CoA. Enzymatic conversion of pyruvate to oxaloacetate. Enzymatic conversion of glyceraldehyde 3-phosphate to 3-phosphoglycerate.
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Glycolysis. In the third step of glycolysis, the enzyme phosphofructokinase transfers a phosphate group from ATP to fructose-6-phosphate to generate fructose-1,6-bisphosphate. In contrast, in step 10, the enzyme pyruvate kinase transfers a phosphate group from phosphoenolpyruvate to ADP to generate ATP. Using what you know about the standard free energy change associated with phosphate bonds, (briefly) explain why we observe this difference.
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The yellow molecule shown above is the enzyme pyruvate kinase (PK). PK functions at the last chemical reaction of glycolysis by binding substrates PEP and ADP in the region highlighted in cyan and catalyzing their conversion to products pyruvate and ATP. Based on this information and your understanding of enzymes, free energy, and coupled chemical reactions in cells, decide whether the following statements are TRUE or FALSE. (Hint-sketching out free-energy diagrams of reactions on scratch paper is always a good idea!) 1. In terms of free energy, the conversion of PEP to pyruvate must be exergonic. 2. The enzyme PK catalyzes the reaction by decreasing the overall free energy of the products. 3. The enzyme PK is a polypeptide chain. 4. The coupled chemical reaction that enzyme PK catalyzes is spontaneous, mostly because it results in a decrease in enthalpy.
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What is the enzyme that catalyzes this reaction? A. triose phosphate isomerase B. glyceraldehyde 3-phosphate dehydrogenase C. aldoase D. phosphoglycerate mutase E. phosphoglycerate kinase F. pyruvate kinase
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