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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

In a starch molecule, the α-1,6 glycosidic bonds at the branch points in amylopectin represent a small fraction of the total bonds, yet they are crucial for the structure. The enzyme that specifically hydrolyzes these α-1,6 bonds is a

A. Phosphorylase
B. Transferase
C. Debranching enzyme (α-1,6-glucosidase)
✓
D. Branching enzyme

📝 Explanation

The debranching enzyme's α-1,6-glucosidase activity specifically hydrolyzes the α-1,6 bond at a branch point, releasing a free glucose molecule. This action is essential for the complete degradation of glycogen and amylopectin, as phosphorylase cannot act on or near these bonds.

📖 Additional Information

  • Phosphorylase
  • Transferase
  • Debranching enzyme (α-1,6-glucosidase)
  • Branching enzyme

The debranching enzyme's α-1,6-glucosidase activity specifically hydrolyzes the α-1,6 bond at a branch point, releasing a free glucose molecule. This action is essential for the complete degradation of glycogen and amylopectin, as phosphorylase cannot act on or near these bonds.

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