Abstract
(Chemical Equation Presented) It takes two: Both a lysine and a glutamate residue in the active site of tryptophan halogenase are essential for its chlorination activity. A mechanism for the regioselective enzymatic chlorination of tryptophan involving both amino acids is suggested (see scheme). © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.
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