Question

The cofactor of the enzyme carboxypeptidase is :

• A. Zinc
• B. Niacin
• C. Flavin
• D. Haem

Answer 1

The Correct Option is A

The cofactor of the enzyme carboxypeptidase is:

Option 1: Zinc

Explanation:

Carboxypeptidase is a protease enzyme that hydrolyzes peptide bonds at the C-terminal end of proteins. It requires a metal ion cofactor for its activity, and that cofactor is zinc (Zn²⁺). The zinc ion is essential for the catalytic mechanism of carboxypeptidase.

Let's look at why the other options are incorrect:

• Niacin: Niacin is a component of NAD and NADP, which are coenzymes involved in redox reactions.
• Flavin: Flavin (FAD or FMN) is a cofactor involved in redox reactions, often in enzymes like dehydrogenases and oxidases.
• Haem: Haem is a cofactor found in proteins like hemoglobin and cytochromes, involved in oxygen transport and electron transfer.