Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYMODEL PAPER 51 Mark
MCQ
Which one is the cofactor for the proteolytic enzyme carboxypeptidase?
A
Mercury
B
Copper
C
Zinc
D
Magnesium
✓
Answer
(c) Zinc Explanation: Zinc is a cofactor for the proteolytic enzyme carboxypeptidase and forms coordination bonds with the side chains of two histidines and one glutamic acid residue at the active site. A fourth bond is formed between zinc and the a- carboxyl group of the substrate amino acids, and it is here that the cleavage of the peptide occurs.
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