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J. Biol. Chem., Vol. 276, Issue 9, 6299-6305, March 2, 2001

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Porphyromonas gingivalis DPP-7 Represents a Novel Type of Dipeptidylpeptidase^*

Agnieszka Banbula^§, Jane Yen, Aneta Oleksy^§, Pawel Mak^§, Marcin Bugno^§, James Travis, and Jan Potempa^§¶

From the  Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602 and the ^§ Institute of Molecular Biology, Jagiellonian University, 34-120 Krakow, Poland

A novel dipeptidylpeptidase (DPP-7) was purified from the membrane fraction of Porphyromonas gingivalis. This enzyme, with an apparent molecular mass of 76 kDa, has the specificity for both aliphatic and aromatic residues in the P1 position. Although it belongs to the serine class of peptidases, it does not resemble other known dipeptidylpeptidases. Interestingly, the amino acid sequence around the putative active site serine residue shows significant similarity to the C-terminal region of the Staphylococcus aureus V-8 endopeptidase. The genes encoding homologues of DPP-7 were found in genomes of Xylella fastidiosa, Shewanella putrefaciens, and P. gingivalis. It is likely that at least in P. gingivalis, DPP-7 and its homologue, in concert with other di- and tripeptidases, serve nutritional functions by providing dipeptides to this asaccharolytic bacterium.

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