title: Inhibitory effects of hexylresorcinol and dodecylresorcinol on mushroom (Agaricus bisporus) tyrosinase.
abstract: The effects of hexylresorcinol and dodecylresorcinol on the monophenolase and diphenolase activity of mushroom tyrosinase have been studied. The results show that hexylresorcinol and dodecylresorcinol can inhibit both monophenolase and diphenolase activity of the enzyme. The lag period of the enzyme was obviously lengthened, and the steady-state activity of the enzyme decreased sharply. Two microM of hexylresorcinol and dodecylresorcinol can lengthen the lag period from 98 s to 260 and 275 s, respectively. Both hexylresorcinol and dodecylresorcinol can lead to reversible inhibition of the enzyme. The IC50 values of hexylresorcinol and dodecylresorcinol were estimated as 1.24 and 1.15 microM for monophenolase and as 0.85 and 0.80 microM for diphenolase, respectively. A kinetic analysis shows that hexylresorcinol and dodecylresorcinol are competitive inhibitors. The apparent inhibition constant for hexylresorcinol and dodecylresorcinol binding with free enzyme has been determined to be 0.443 and 0.405 microM for diphenolase, respectively.
authors.affiliation: The Key Laboratory of Ministry of Education for Cell Biology and Tumor Cell Engineering, School of Life Sciences, Xiamen University, Xiamen 361005, People's Republic of China. chenqx@jiangxian.xmu.edu.cn
authors.forename: Qing-Xi
authors.initials: QX
authors.lastname: Chen
authors.forename: Li-Na
authors.initials: LN
authors.lastname: Ke
authors.forename: Kang-Kang
authors.initials: KK
authors.lastname: Song
authors.forename: Huang
authors.initials: H
authors.lastname: Huang
authors.forename: Xiao-Dan
authors.initials: XD
authors.lastname: Liu
mesh_terms: D000363:Agaricales / Q000187:drug effects / Q000201:enzymology*; D004156:Catechol Oxidase / Q000737:chemistry / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006604:Hexylresorcinol / Q000494:pharmacology*; D020128:Inhibitory Concentration 50; D014442:Monophenol Monooxygenase / Q000037:antagonists & inhibitors* / Q000378:metabolism; D010088:Oxidoreductases / Q000737:chemistry / Q000378:metabolism; D012118:Resorcinols / Q000494:pharmacology*
chemical_list: D004791:Enzyme Inhibitors; D012118:Resorcinols; D010088:Oxidoreductases; D004156:Catechol Oxidase; C412191:monophenolase; D014442:Monophenol Monooxygenase; D006604:Hexylresorcinol