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Effect of substitution of phosphorylated Tyr residues with Phe in Kgp (a and b) and RgpA (c–e) on gingipain activity. Rgp and Kgp activity was measured with L-BApNA and Tos-GPK-pNA as the substrate, respectively, in both whole culture and growth medium after bacterial cells were removed by centrifugation. Activity of W83 and ΔrgpB was arbitrarily taken as 100%. ****p < 0.0001; ***p < 0.0005; **p < 0.001; *p < 0.05
