7-dimethylallyltryptophan synthase (, 7-DMATS) is an enzyme with systematic name dimethylallyl-diphosphate:L-tryptophan 7-dimethylallyltransferase. It catalyses the following chemical reaction which adds a prenyl group from dimethylallyl pyrophosphate to L-tryptophan, specifically in its 7-position, giving 7-(3-methylbut-2-enyl)-L-tryptophan, with pyrophosphate (PPi) as byproduct:
This enzyme characterised from Aspergillus fumigatus is more flexible towards the aromatic substrate than tryptophan dimethylallyltransferase.
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