This article is about the cytosolic alanine aminopeptidase. For the cell membrane alanyl aminopeptidase, see
Alanine aminopeptidase.
Puromycin-sensitive amino peptidase also known as cytosol alanyl aminopeptidase or alanine aminopeptidase (AAP) (EC 3.4.11.14) is an enzyme that in humans is encoded by the NPEPPS gene. It is used as a biomarker to detect damage to the kidneys, and that may be used to help diagnose certain kidney disorders. It is found at high levels in the urine when there are kidney problems.