The identification of proteinases of Porphyromonas gingivalis that act as virulence factors in periodontal disease has important implications in the study of host-pathogen interactions as well as in the discovery of potential therapeutic and immunoprophylactic agents. We have cloned and characterized a gene that encodes the 50-kDa cysteine proteinase gingipain or Arg-gingipain-1 (RGP-1) described previously (Chen, Z., Potempa, J., Polanowski, A., Wikstrom, M., and Travis, J. (1992) J. Biol. Chem. 267, 18896-18901). Analysis of the amino acid sequence of RGP-1 deduced from the cloned DNA sequence showed that the biosynthesis of this proteinase involves processing of a polyprotein that contains multiple adhesin molecules located at its carboxyl terminus. This finding corroborates previous evidence (Pike R., McGraw, W., Potempa, J., and Travis, J.(1994) J. Biol. Chem. 269, 406-411) that RGP-1 is closely associated with adhesin molecules, and that high molecular weight forms of the proteinase are involved in the binding of erythrocytes.

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