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Tyr72 is located at the active site of tryptophanase (Trpase) from Proteus vulgaris. For the wild-type Trpase Tyr72 might be considered as the general acid catalyst at the stage of elimination of the leaving groups. The replacement of Tyr72 by Phe leads to a decrease in activity for l-tryptophan by 50,000-fold and to a considerable rearrangement of the active site of Trpase. This rearrangement leads...
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