Kenton Hicks, Kyle Stucker, Allen Betts
Trypsin is serine protease which catalyzes the hydrolysis of peptide bonds of a substrate via an acylation reaction and a deacylation reaction. In the first (acylation) reaction, the nucleophilic serine attacks the substrate scissile bond, forming a tetrahedral intermediate and then a covalent acyl-enzyme with the release of the C-terminal fragment. In the second (deacylation) reaction, a water molecule attacks the acyl-enzyme, leading to a second tetrahedral intermediate followed by release of the N-terminal fragment. The specificity of substrates is determined by the structure of its specificity pocket, which contains Ser 195, His 57, and Asp 102. These three residues make up the , which are involved in catalyzing the reaction. An is specifically formed between the amide hydrogen atoms of Serine 195 and Glycine 193. This oxyanion hole stabilizes the tetrahedral intermediate through the distribution of negative charge to the cleaved amide.
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