Contributes to the degradation of bradykinin. Catalyzes the removal of a penultimate prolyl residue from the N-termini of peptides, such as Arg-Pro-Pro (By similarity). Release of any N-terminal amino acid, including proline, that is linked to proline, even from a dipeptide or tripeptide. Binds 2 manganese ions per subunit. Homodimer. Belongs to the peptidase M24B family.