Discussion
Match the CORRECT option(s) from column A with column B according to the metal centre present in the active site of metalloenzyme.
| A | B | ||
|---|---|---|---|
| P | Cu | I | B12-coenzyme |
| Q | Mo | II | Carboxypeptidase |
| R | Co | III | Nitrate reductase |
| S | Zn | IV | Cytochrome P-450 |
| V | Tyrosinase | ||
Answer: A
The correct matching is P-V, Q-III, R-I, S-II.
- Cu: tyrosinase, a type 3 dicopper enzyme that hydroxylates phenols and oxidises them to quinones.
- Mo: nitrate reductase, which uses a molybdenum cofactor (Mo-pterin) to reduce nitrate to nitrite.
- Co: the B12 coenzyme, a cobalt corrin complex (adenosylcobalamin).
- Zn: carboxypeptidase, a zinc hydrolase that cleaves the C-terminal peptide bond.
Cytochrome P-450 (IV) has an iron porphyrin (heme) active site, so it matches none of the four metals listed and is the extra item. Every other option either pairs a metal with P-450 or swaps the cobalt and zinc enzymes.
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