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Mechanistic Studies on Tryptophan Lyase (NosL): Identification of Cyanide as a Reaction Product
Journal of the American Chemical Society ( IF 13.858 ) Pub Date : 2018-01-02 , DOI: 10.1021/jacs.7b09000
Dhananjay M. Bhandari, Dmytro Fedoseyenko, Tadhg P. Begley

Tryptophan lyase (NosL) catalyzes the formation of 3-methylindole-2-carboxylic acid and 3-methylindole from l-tryptophan. In this paper, we provide evidence supporting a formate radical intermediate and demonstrate that cyanide is a byproduct of the NosL-catalyzed reaction with l-tryptophan. These experiments require a major revision of the NosL mechanism and uncover an unanticipated connection between NosL and HydG, the radical SAM enzyme that forms cyanide and carbon monoxide from tyrosine during the biosynthesis of the metallo-cluster of the [Fe–Fe] hydrogenase.
更新日期:2018-01-03

 

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