Aminopeptidase I (EC 3.4.11.22, aminopeptidase III, aminopeptidase yscI, leucine aminopeptidase IV, yeast aminopeptidase I) is an enzyme. This enzyme catalyses the following chemical reaction Aminopeptidase I (EC 3.4.11.22, aminopeptidase III, aminopeptidase yscI, leucine aminopeptidase IV, yeast aminopeptidase I) is an enzyme. This enzyme catalyses the following chemical reaction