FIG 4.

Increased susceptibility of Cnm from the ΔpgfS strain to proteinase K degradation. Whole cells from S. mutans OMZ175 and its ΔpgfS and CpgfS derivatives were treated with increasing concentrations of proteinase K (0, 0.3, 3, or 30 μg ml⁻¹) for 30 min. Upon treatment, whole-cell lysates were prepared, and Cnm degradation was monitored by Western blotting.