X-Prolyl Aminopeptidase 2, Membrane Bound (XPNPEP2)

Aminopeptidase P is a hydrolase specific for N-terminal imido bonds, which are common to several collagen degradation products, neuropeptides, vasoactive peptides, and cytokines. Structurally, the enzyme is a member of the 'pita bread fold' family and occurs in mammalian tissues in both soluble and GPI-anchored membrane-bound forms. A membrane-bound and soluble form of this enzyme have been identified as products of two separate genes.The deduced XPNPEP2 protein consists of 673 amino acids and has an estimated molecular mass of 75,490 Da. The authors stated that the human and pig XPNPEP2 amino acid sequences show significant evolutionary divergence, with 83% identity; 5 of 6 potential N-glycosylation sites, and 5 of 6 cysteine residues that are potentially involved in disulfide bond formation, are conserved.