Article
Catalytic mechanism of SGAP, a double-zinc aminopeptidase from Streptomyces griseus.
The FEBS journal - 1 Aug 2007
Hershcovitz Yifat F, Gilboa Rotem, Reiland Vera, Shoham Gil, Shoham Yuval
Abstract excerpt
The catalytic mechanism underlying the aminopeptidase from Streptomyces griseus (SGAP) was investigated. pH-dependent activity profiles revealed the enthalpy of ionization for the hydrolysis of leucine-para-nitroanilide by SGAP. The value obtained (30 +/- 5 kJ.mol(-1)) is typical of a zinc-bound water molecule, suggesting that the zinc-bound water/hydroxide molecule acts as the reaction nucleophile. Fluoride was...
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