Mechanistic studies of the inactivation of tyrosinase by resorcinol

作者：Stratford Michael R L; Ramsden Christopher A^*; Riley Patrick A

来源：Bioorganic & Medicinal Chemistry, 2013, 21(5): 1166-1173.

DOI：10.1016/j.bmc.2012.12.031

• Tyrosinase
• Resorcinols
• Quinones
• Oximetry
• Quintox mechanism

The inactivation of tyrosinase by resorcinol (1,3-dihydroxybenzene) and seventeen simple derivatives has been investigated using combined spectrophotometry and oximetry together with hplc/ms examination of the oxidation products. The results are consistent with a Quintox mechanism, analogous to that proposed for catechol inactivation of tyrosinase, in which the resorcinol substrate is oxidised via the monooxygenase route leading to a hydroxy intermediate that undergoes deprotonation and results in irreversible elimination of Cu(0) from the active site. Hplc/ms evidence for formation of the resorcinol monooxygenase product (3-hydroxy-ortho-quinone) is presented and the relationship between the ring position of simple resorcinol substituents (H, Me, F, Cl) and tyrosinase inactivation is rationalised.

• 出版日期2013-3-1