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• W1972168882 abstract "Mushroom tyrosinase was found to catalyze the oxidation of organic sulfides to sulfoxides in the presence of a catechol as cosubstrate, in a reaction which is unprecedented for this enzyme and resembles those performed by external monooxygenases. Only the oxy form of the enzyme is in fact capable of oxidizing the sulfide in a two-electron process, while the resulting met form can only be recycled by reduction with catechol. The cosubstrate competes with the sulfide also in the reaction with oxy-tyrosinase. For this reason, the sulfoxidation of thioanisole in the presence of l-3,4-dihydroxyphenylalanine (L-dopa) occurs with moderate yields ( approximately 20%) but high enantioselectivity ( approximately 85% e.e.), and favors ( S)-methyl phenyl sulfoxide. The enantioselectivity can be further increased to >90% when excess ascorbic acid is added to the reaction to limit enzyme inactivation by the quinones produced by L-dopa oxidation. An experiment using (18)O 2 showed that 18-O incorporation into methyl phenyl sulfoxide was above 95%, confirming that the mechanism of the sulfoxidation involves oxygen transfer from oxy-tyrosinase to the sulfide." @default.
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• W1972168882 date "2008-02-23" @default.
• W1972168882 modified "2023-10-13" @default.
• W1972168882 title "Tyrosinase Catalyzes Asymmetric Sulfoxidation" @default.
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• W1972168882 doi "https://doi.org/10.1021/bi702421b" @default.
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