Human Aminopeptidase O/ONPEP Antibody

Aminopeptidase O (AP-O; also C9orf3) is a 93 kDa (predicted), intracellular member of the M1 metalloprotease family of enzymes. It is expressed in heart, testis and pancreas where it apparently cleaves N terminal Arg and Asn residues. Human Aminopeptidase O is 819 amino acids in length. It contains one catalytic domain (aa 167‑589) with a Zn-binding site (His479-His483) and a C terminal ARM region (aa 706-819). At least three additional isoforms exist. One shows a deletion of aa 455‑553; a second has an 11 aa substitution for the C terminal 265 amino acids; and a third shows both a deletion of aa 455‑553 and an 11 aa substitution for the C-terminal 46 amino acids. Full length human Aminopeptidase O is 76% aa identical to mouse Aminopeptidase O.