From Suicide Enzyme to Catalyst: The Iron-Dependent Sulfide Transfer in Methanococcus jannaschii Thiamin Thiazole Biosynthesis.
Publication Type:Journal Article
Source:J Am Chem Soc, Volume 138, Issue 11, p.3639-42 (2016)
Keywords:Catalysis, Electron Spin Resonance Spectroscopy, Ferric Compounds, Ferrous Compounds, Methanocaldococcus, Models, Molecular, Sulfides, Thiamine, Thiazoles
<p>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.</p>