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- W2155212912 abstract "Streptomyces actuosus tryptophan lyase (NosL) is a radical SAM enzyme which catalyzes the synthesis of 3-methyl-2-indolic acid, a precursor in the synthesis of the promising antibiotic nosiheptide. The reaction involves cleavage of the tryptophan CαCβ bond and recombination of the amino-acid-derived -COOH fragment at the indole ring. Reported herein is the 1.8 Å resolution crystal structure of NosL complexed with its substrate. Unexpectedly, only one of the tryptophan amino hydrogen atoms is optimally placed for H abstraction by the SAM-derived 5′-deoxyadenosyl radical. This orientation, in turn, rules out the previously proposed delocalized indole radical as the species which undergoes CαCβ bond cleavage. Instead, stereochemical considerations indicate that the reactive intermediate is a .NH tryptophanyl radical. A structure-based amino acid sequence comparison of NosL with the tyrosine lyases ThiH and HydG strongly suggests that an equivalent .NH radical operates in the latter enzymes." @default.
- W2155212912 created "2016-06-24" @default.
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- W2155212912 date "2014-09-05" @default.
- W2155212912 modified "2023-10-03" @default.
- W2155212912 title "Crystal Structure of Tryptophan Lyase (NosL): Evidence for Radical Formation at the Amino Group of Tryptophan" @default.
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- W2155212912 doi "https://doi.org/10.1002/anie.201407320" @default.
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