Membrane-bound metalloprotease which catalyzes the removal of a penultimate prolyl residue from the N-termini of peptides, such as Arg-Pro-Pro. May play a role in the metabolism of the vasodilator bradykinin. . This is the function of XPNPEP2 (X-prolyl aminopeptidase 2, Ensembl gene identifier ENSG00000122121).