Indirect inactivation of tyrosinase in its action on 4-tert-butylphenol

Jose Luis Muñoz-Muñoz, María del Mar García-Molina, Francisco García-Molina, Ramón Varon, Pedro Antonio García-Ruiz, Jose Neptuno Rodríguez-López, Francisco García-Cánovas

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5 Citations (Scopus)


Under anaerobic conditions, the o-diphenol 4-tert-butylcatechol (TBC) irreversibly inactivates met and deoxytyrosinase enzymatic forms of tyrosinase. However, the monophenol 4-tert-butylphenol (TBF) protects the enzyme from this inactivation. Under aerobic conditions, the enzyme suffers suicide inactivation when it acts on TBC. We suggest that TBF does not directly cause the suicide inactivation of the enzyme in the hydroxylase activity, but that the o-diphenol, which is necessary for the system to reach the steady state, is responsible for the process. Therefore, monophenols do not induce the suicide inactivation of tyrosinase in its hydroxylase activity, and there is a great difference between the monophenols that give rise to unstable o-quinones such as L-tyrosine, which rapidly accumulate L-dopa in the medium and those like TBF, after oxidation, give rise to a very stable o-quinone.

Original languageEnglish
Pages (from-to)344-352
Number of pages9
JournalJournal of Enzyme Inhibition and Medicinal Chemistry
Issue number3
Early online date11 Apr 2013
Publication statusPublished - 1 Jun 2014


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