title: Inhibitory effect of morin on tyrosinase: insights from spectroscopic and molecular docking studies.
abstract: Tyrosinase is a key enzyme in the production of melanin in the human body, excessive accumulation of melanin can lead to skin disorders. Morin is an important bioactive flavonoid compound widely distributed in plants and foods of plant origin. In this study, the inhibitory kinetics of morin on tyrosinase and their binding mechanism were determined using spectroscopic and molecular docking techniques. The results indicate that morin reversibly inhibited tyrosinase in a competitive manner through a multi-phase kinetic process. Morin was found to bind to tyrosinase at a single binding site mainly by hydrogen bonds and van der Waals forces. Analysis of circular dichroism spectra revealed that the binding of morin to tyrosinase induced rearrangement and conformational changes of the enzyme. Moreover, molecular docking results suggested that morin competitively bound to the active site of tyrosinase with the substrate levodopa.
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
authors.forename: Yajie
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China. Electronic address: gwzhang@ncu.edu.cn.
authors.forename: Guowen
authors.initials: G
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
authors.forename: Jiakai
authors.initials: J
authors.lastname: Yan
authors.affiliation: School of Biological Sciences, The University of Auckland, Auckland 1142, New Zealand.
authors.forename: Deming
authors.initials: D
authors.lastname: Gong
mesh_terms: D001665:Binding Sites; D020134:Catalytic Domain; D002942:Circular Dichroism; D004791:Enzyme Inhibitors / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry*; D006801:Humans; D007700:Kinetics; D062105:Molecular Docking Simulation; D014442:Monophenol Monooxygenase / Q000037:antagonists & inhibitors* / Q000737:chemistry; D013057:Spectrum Analysis; D047309:Flavones
chemical_list: D004791:Enzyme Inhibitors; D005419:Flavonoids; D014442:Monophenol Monooxygenase; C008548:morin; D047309:Flavones
keywords: Inhibitory mechanism; Molecular docking; Morin; Multi-spectroscopic technique; Tyrosinase