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Dipeptidyl aminopeptidase IV from Stenotrophomonas maltophilia exhibits activity against a substrate containing a 4-hydroxyproline residue
Journal of Bacteriology 190: 7819

Xu Y, Nakajima Y, Ito K, Zheng H, Oyama H, Heiser U, Hoffmann T, Gartner UT, Demuth HU, Yoshimoto T (2008)
Novel inhibitor for prolyl tripeptidyl aminopeptidase from Porphyromonas gingivalis and details of substrate-recognition mechanism
Journal of Molecular Biology 375: 708