IGNOU BBCCT 109 2025 - Explain in detail the synthesis of ceramide.

Question

Explain in detail the synthesis of ceramide.

14 May 2026

Answer :

Word Count : 314

Ceramide is a central sphingolipid molecule that plays a key role in cell membrane structure and acts as a bioactive signaling lipid involved in apoptosis, growth arrest, and stress responses. Its synthesis occurs mainly through three interconnected pathways: de novo synthesis, salvage pathway, and sphingomyelin hydrolysis. The de novo pathway begins in the endoplasmic reticulum with the condensation of the amino acid serine and palmitoyl-CoA. This reaction is catalyzed by the enzyme serine palmitoyltransferase, which forms 3-ketosphinganine (3-ketodihydrosphingosine). This is the rate-limiting step of ceramide biosynthesis. The 3-ketosphinganine is then rapidly reduced by 3-ketosphinganine reductase to produce sphinganine (dihydrosphingosine). Next, sphinganine undergoes N-acylation by a family of enzymes known as ceramide synthases (CerS1–CerS6),

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