Aminopeptidase S (, Mername-AA022 peptidase, SGAP, aminopeptidase (Streptomyces griseus), Streptomyces griseus aminopeptidase, S. griseus AP, double-zinc aminopeptidase) is an enzyme. This enzyme catalyses the following chemical reaction
This enzyme contains two zinc molecules in its active site and is activated by Ca<sup>2+</sup>.