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. 2018 Feb 9;8:2714. doi: 10.1038/s41598-018-21056-y

Figure 7.

Figure 7

Possible reaction mechanism of the hydrolysis of a peptide substrate catalysed by PmDAP IV. Our crystal structures provide structural information for the sixth (the acyl-enzyme intermediate) and eighth (the second product) molecular stages of peptide digestion by PmDAP IV and are indicated by black and grey rounded rectangles, respectively. Human DPP IV complexed with diprotin A or with a decapeptide provides structural information for the fourth (the first tetrahedral intermediate) molecular stage and is indicated by a dashed-line rectangle.