From Suicide Enzyme to Catalyst: The Iron-Dependent Sulfide Transfer in Methanococcus jannaschii Thiamin Thiazole Biosynthesis

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• 作者：Bekir E. Eser ; Xuan Zhang ; Prem K. Chanani ; Tadhg P. Begley ; Steven E. Ealick
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：March 23, 2016
• 年：2016
• 卷：138
• 期：11
• 页码：3639-3642
• 全文大小：302K
• ISSN：1520-5126

文摘

Bacteria and yeast utilize different strategies for sulfur incorporation in the biosynthesis of the thiamin thiazole. Bacteria use thiocarboxylated proteins. In contrast, Saccharomyces cerevisiae thiazole synthase (THI4p) uses an active site cysteine as the sulfide source and is inactivated after a single turnover. Here, we demonstrate that the Thi4 ortholog from Methanococcus jannaschii uses exogenous sulfide and is catalytic. Structural and biochemical studies on this enzyme elucidate the mechanistic details of the sulfide transfer reactions.