Figure 5

Identification of the proline recognition site. (A) Structural alignment of PRCP (blue) with porcine PEP (yellow) in complex with the peptide substrate EFSP (PDB code: 1UOQ) in light blue. Residues discussed in the text are shown as sticks and labeled. (B) Structural alignment of PRCP (blue) with human DPP4 (orange) in complex with the peptide substrate YPSK (PDB code: 1R9N) in pink.