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Chapter 15: Q14P (page 521)

What is the advantage of activating pyruvate kinase with fructose-1, 6-bisphosphate?

Short Answer

Expert verified

Fructose-1,6-bisphosphate acts as a feed-forward for the pyruvate kinase.

Step by step solution

01

Glycolysis

One molecule of glucose is transformed into two molecules of pyruvate during the process known as glycolysis. Glycolysis is a series of ten enzyme-catalyzed reactions. Overall, 2 ATP is created; throughout this process, 2 NAD+ is converted to 2 NADH.

02

Advantage of activating pyruvate kinase with Fructose-1,6-bisphosphate

The result of the third glycolysis step is fructose-1, 6-bisphosphate, which activates pyruvate kinase. FBP is a feed-forward stimulant in a glycolytic pathway intermediate because it increases allosteric activation and pyruvate kinase activity as its concentration increases.

Hence, the final six stages of glycolysis are pushed forward towards completion by this regulatory mechanism.

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Most popular questions from this chapter

Draw the enediolate intermediate of the ribulose-5-phosphate epimerase reaction (Ru5P 鈫� Xu5P).

鈭咷掳藞 for the aldolase reaction is 22.8 kJ. mol-鹿. In the cell at 37掳C,[DHAP]/[GAP] = 5.5. Calculate the equilibrium ratio of [FBP]/[GAP]when (GAP) = 10-鈦碝.

Explain how chemical coupling of endergonic and exergonic reactions is used to generate ATP during glycolysis.

Some organisms can anaerobically convert glycerol to pyruvate. Could homolactic or alcoholic fermentation regenerate sufficient NAD鈦簍o support this pathway?

How does phosphorylation differ between the kinase-catalyzed reactions and the reaction catalyzed by GAPDH?
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