Fig. 2.

Inhibitory activity of wild-type IMPI. (A) Residual fractional activity as V_i/V₀ relative to the activity in the absence of inhibitor of (left) 10 nM ulilysin, (middle) 100 nM aureolysin, and (right) 10 nM thermolysin after incubation with wt-IMPI at several molar ratios using the DQ gelatin substrate. (B) As above, but using the internally quenched fluorescent FRET-4 peptide as the substrate.