title: Kinetic study in the transient phase of the suicide inactivation of frog epidermis tyrosinase.
abstract: This paper deals with the kinetic study of a multisubstrate mechanism with enzyme inactivation induced by a suicide substrate. A transient phase approach has been developed that enables the deduction of explicit equations of product concentration vs. time. From these equations kinetic constants which characterize the suicide substrate can be obtained. This study with tyrosinase enzyme, which acts on L-dopa and catechol allowed us to determine the corresponding kinetic parameters, indicating that catechol is about 8-times more powerful as a suicide substrate than is L-dopa.
authors.affiliation: Departamento de Bioquimica y Biologia Molecular, Universidad de Murcia, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Tudela
authors.forename: F
authors.initials: F
authors.lastname: Garcia Cánovas
authors.forename: R
authors.initials: R
authors.lastname: Varón
authors.forename: M
authors.initials: M
authors.lastname: Jiménez
authors.forename: F
authors.initials: F
authors.lastname: Garcia-Carmona
authors.forename: J A
authors.initials: JA
authors.lastname: Lozano
mesh_terms: D000818:Animals; D004156:Catechol Oxidase / Q000037:antagonists & inhibitors*; D002396:Catechols / Q000494:pharmacology; D004817:Epidermis / Q000201:enzymology*; D007700:Kinetics; D007980:Levodopa / Q000494:pharmacology; D008433:Mathematics; D008962:Models, Theoretical; D014442:Monophenol Monooxygenase / Q000037:antagonists & inhibitors*; D011898:Ranidae
chemical_list: D002396:Catechols; D007980:Levodopa; D004156:Catechol Oxidase; D014442:Monophenol Monooxygenase; C034221:catechol