This cell-surface-associated serine exopeptidase is found in the Gram-negative, anaerobic bacterium Porphyromonas gingivalis, which has been implicated in adult periodontal disease . The enzyme releases the N-terminal tripeptide of peptides, such as interleukin-6. It has an absolute requirement for a proline residue at the P1 position but is completely inactivated by a proline residue at the P1′ position . The size of the peptide does not affect the rate of reaction .
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Fujimura, S., Ueda, O., Shibata, Y. and Hirai, K. Isolation and properties of a tripeptidyl peptidase from a periodontal
pathogen Prevotella nigrescens. FEMS Microbiol. Lett.219 (2003) 305–309. [PMID: 12620636]