Function
Releases the N-terminal proline from various substrates including at least dipeptides Pro-Pro, Pro-Gln, Pro-Trp and Pro-Tyr. Acts also on amides (Pro-beta NA) and oligopeptides including Pro-Leu-GlyNH2, Pro-Leu-Gly, Pro-Phe-Gly-Lys, Pro-Pro-Ala-OBut and Pro-Pro-Gly-(Pro-Pro-Gly)(4). Higher activity toward small peptides (up to three residues), but very low activity for longer peptides. Has no activity against p-nitrophenyl acetate, poly_L-proline, Met-Pro or amino acyl amides other than Pro-betaNA (Pyr-betaNA, Phe-betaNA, Cys-betaNA, Met-betaNA, Leu-betaNA, Ala-betaNA and Z-Gly-Pro-betaNA).