IGNOU BBCCT 109 2025 - Elaborate the reactions catalysed by fatty acid synthase-I complex.&nb

Question

Elaborate the reactions catalysed by fatty acid synthase-I complex.

14 May 2026

Answer :

Word Count : 328

The fatty acid synthase-I (FAS-I) complex is a multifunctional enzyme system responsible for the de novo synthesis of fatty acids, primarily palmitate, in eukaryotic cells. This complex operates in the cytoplasm and catalyzes a series of reactions that sequentially elongate an acyl chain using acetyl-CoA and malonyl-CoA as substrates, with NADPH providing the reducing power. The process begins with the priming of the enzyme by acetyl-CoA, which is transferred to the acyl carrier protein (ACP) domain through the action of the malonyl/acetyltransferase (MAT). Concurrently, malonyl-CoA is also loaded onto the ACP, setting the stage for the condensation reaction. The key step in chain elongation is the Claisen condensation, catalyzed by the β-ketoacyl synthase (KS) domain. Here, the acetyl

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