– Thiol protease. Acts synergistically with RgpB to catalyze the maturation of fimbrial subunits, such as FimA. Its proteolytic activity is a major factor in both periodontal tissue destruction and in evasion of host defense mechanisms (Probable). Gingipain R1 Protein, Porphyromonas gingivalis, Recombinant (His) is expressed in yeast with N-6xHis tag. The predicted molecular weight is 56.0 kDa and the accession number is P28784.