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Tyrosinase (monophenol, O-diphenol: oxygen oxidoreductase, EC 1.14.18.1) is a copper-containing protein widely distributed in animals, plants and microorganisms. The enzyme was extracted from Cucurbitapepovar. cylindrica, (marrow, family:Cucurbitaceae). Proline, tryptophane, aspartic acid, cysteine, histidine, glycine, β-alanine and valinewere assayed for their effect on tyrosinase activity in different concentrations (2.5, 5, 7.5, 10 and 12.5 mM)in vitro. Histidine, aspartic acid, glycine and β-alanine induced tyrosinase activity gradually from 2.5 to 10 mM after which there was a decline in the enzyme activity. Tryptophane, valine and cysteine induced the activity up to 5 mM, while proline induced the activity from 2.5 to 7.5mM. Also, tyrosinase activity was assayed in presence of benzaldehyde, anisaldehyde (P-methoxybenzaldehyde) and acetaldehyde (0.1, 0.2, 0.3, 0.4 and 0.5 mM).It was found that the enzyme activity was inhibited by the three tested aldehydes.

EFFECT OF AMINO ACIDS AND ALDEHYDES ON TYROSINASE ACTIVITY FROM MARROW