Kinetic study of the interaction between frog epidermis tyrosinase and chloride.
Biochim Biophys Acta
; 788(3): 327-32, 1984 Aug 14.
Article
em En
| MEDLINE
| ID: mdl-6432048
ABSTRACT
The effect of halide ions on frog epidermis tyrosinase has been characterized with the trypsin-activated enzyme. At pH 7, the order of inhibition is I- greater than Br- greater than Cl- greater than F-. Chloride, the most extensively studied halide, shows a competitive pattern with respect to the substrate, L-DOPA. Inhibition is strongly pH-dependent, with a pKa of 6.12 for the responsible protonatable group. Other kinetic constants are also calculated using a novel approach. The mechanism of interaction between chloride and the enzyme is discussed, and a model is proposed in which chloride interferes the tyrosinase activity by displacing a catalytically important ligand, probably a histidine residue of the side-chain, from the copper at the enzyme-active site.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Pele
/
Cloretos
/
Catecol Oxidase
/
Monofenol Mono-Oxigenase
Limite:
Animals
Idioma:
En
Ano de publicação:
1984
Tipo de documento:
Article