Alaninska aminopeptidaza (EC3.4.11.2) je enzim koji se koristi kao biomarker za detekciju oštećenja bubrega. On se može koristiti u dijagnozi pojedinih tipova bubrežnih poremećaja. Ona je prisutna u visokim nivoima u urinu, kad postoji problem sa bubrezima.
Aminopeptidaza N je locirana u malim crevima i renalnoj mikrovilarnoj membrani, kao i drugim ćelijskim membranama. U tankim crevima aminopeptidaza N učestvuje u finalnom stupnju varenja peptida generisanih hidrolizom proteina gastričnim i pankreatičkim proteazama. Njena funkcija u epitelu i drugim tipovima ćelija nije potpuno razjašnjena. Veliki ekstracelularni karboksiterminalni domen sadrži pentapeptidnu konsenzus sekvencu koja je karakteristična za članove zink-vezujuće metaloproteinazne superfamilije. Poređenjem sekvence sa poznatim enzimima ove klase je pokazalo da su CD13 i aminopeptidaza N identični.[1]
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