Explain the biosynthesis of cholesterol from Acetyl-CoA?

Question

08 Mar 2025

Answer :

Word Count : 458

Cholesterol biosynthesis is a complex metabolic pathway that occurs primarily in the liver, beginning with Acetyl-CoA and progressing through multiple enzymatic reactions to produce cholesterol. This pathway is crucial for maintaining cellular membrane integrity, producing steroid hormones, bile acids, and vitamin D. The process can be divided into four key stages:

### 1. Formation of Mevalonate (Committed Step)
The biosynthesis of cholesterol begins with the condensation of three molecules of Acetyl-CoA to form 3-hydroxy-3-methylglutaryl-CoA (HMG-CoA):
- Step 1: Two molecules of Acetyl-CoA condense to form Acetoacetyl-CoA via thiolase enzyme.
- Step 2: Acetoacetyl-CoA reacts with another Acetyl-CoA to form HMG-CoA using HMG-CoA synthase.
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