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Gingipains
Arg-Gingipain (Rgp), Lys- Gingipain (Kgp) are the gingipains secreted by P. gingivalis. The gingipains serve many functions for the organism, which contribute to its survival and virulence (Sheets, Robles-Price et al. 2012)

Arg- gingipains have been found to play a key role in the collection of nutrients for P. gingivalis survival. Rgp has been found to degrade large peptides of the host organism to provide P. gingivalis with an abundant Nitrogen and Carbon source for human albumin serum (Grenier, Imbeault et al. 2001). P. gingivalis was also found to degrade transferrin (TfR) within host cells which provides the organism with an abundant iron source needed to perform multiple cellular functions (Furuta, Takeuchi et al. 2009).