IGNOU BBCCT 109 2025 - Discuss the regulation of cholesterol biosynthesis.

Question

Discuss the regulation of cholesterol biosynthesis.

14 May 2026

Answer :

Word Count : 346

Cholesterol biosynthesis is a tightly regulated metabolic pathway occurring mainly in the liver and, to a lesser extent, in the intestine and other tissues. Since cholesterol is essential for membrane structure, steroid hormone synthesis, and bile acid formation, but potentially harmful in excess, its production is controlled at multiple levels, with 3-hydroxy-3-methylglutaryl-CoA reductase (HMG-CoA reductase) serving as the key rate-limiting enzyme. One major regulatory mechanism is transcriptional control mediated by sterol regulatory element-binding proteins (SREBPs). When intracellular cholesterol levels are low, SREBP is transported from the endoplasmic reticulum to the Golgi, where it is activated by proteolytic

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