Proposal for the mechanism of action of urocanase. Inference from the inhibition by 2-methylurocanate.
Z Naturforsch C J Biosci
; 42(4): 349-52, 1987 Apr.
Article
em En
| MEDLINE
| ID: mdl-2885981
ABSTRACT
Incubation of urocanase with 2-methylurocanate leads, after an initial normal reaction, to a time dependent inactivation of the enzyme. It is suggested that a tautomeric form of the product, 2-methyl-imidazolone propionate, is the actual inhibitor. On the basis of these and of published experimental data a novel mechanism is proposed for the urocanase reaction. The crucial and initial step is the electrophilic addition of enzyme-bound NAD to the 2-position of the imidazole nucleus of urocanate.
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Base de dados:
MEDLINE
Assunto principal:
Urocanato Hidratase
/
Ácido Urocânico
/
Hidroliases
/
Imidazóis
Idioma:
En
Ano de publicação:
1987
Tipo de documento:
Article