The glycerol derived from lipolysis of triacylglycerols is...

Name: Problem 29, Chapter 24: Fundamentals of General, Organic, and Biological Chemistry
Uploaded: 2022-01-14T14:00:12-08:00
Duration: 3 min 48 s
Channel: Ramesh Singh
Description: The glycerol derived from lipolysis of triacylglycerols is converted into glyceraldehyde 3 -phosphate, which then enters into step 6 of the glycolysis pathway. What further transformations are necessary to convert glyceraldehyde 3-phosphate into pyruvate?

The glycerol derived from lipolysis of triacylglycerols is converted into glyceraldehyde 3 -phosphate, which then enters into step 6 of the glycolysis pathway. What further transformations are necessary to convert glyceraldehyde 3-phosphate into pyruvate?

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Key Concepts

Glycolysis

Glycolysis is a central metabolic pathway in which glucose is broken down into pyruvate, yielding ATP and NADH. It involves a series of enzyme?catalyzed reactions that convert glucose to pyruvate through systematic oxidation, phosphorylation, and substrate-level phosphorylation steps, making it a critical process for cellular energy generation.

Enzyme-Catalyzed Reaction Sequence

The transformation of glyceraldehyde 3-phosphate into pyruvate in glycolysis occurs over several steps: first, glyceraldehyde 3-phosphate is oxidized and phosphorylated to generate 1,3-bisphosphoglycerate, which produces NADH; next, a substrate-level phosphorylation converts 1,3-bisphosphoglycerate into 3-phosphoglycerate; subsequently, an isomerization and dehydration convert 3-phosphoglycerate into phosphoenolpyruvate; and finally, the transfer of a phosphate group from phosphoenolpyruvate to ADP forms pyruvate and ATP. Each of these enzyme-catalyzed transformations is vital for the pathway’s overall efficiency and energy yield.

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