GTP, an Inhibitor of Transglutaminases, is Hydrolyzed by Tissue-type Transglutaminase (TGase 2) but not by Epidermal-type Transglutaminase (TGase 3)

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  Epidermal-type transglutaminase (TGase 3) is devoid of GTPase activity, but its TGase activity is inhibited by GTP as in the case of tissue-type TGase (TGase 2). In addition, the inhibition was not affected by the presence of higher concentrations of Ca ion. These results indicate that GTP interacts with TGase 3 in a manner different from its action on TGase 2.