Hydrolysis of PGs by BmPGRP-S5 or lysozyme. Insoluble PGs from B. megaterium, B. subtilis, E. coli, S. aureus, and M. luteus were separately incubated with buffer (i.e., control), BmPGRP-S5 (with or without Zn2+), or lysozyme. Light scattering at 405 nm was monitored for 8 h. Asterisks indicate significant differences: *p < 0.05; **p < 0.01; ***p < 0.001 for pairwise comparisons by Student’s t-tests. ns, not significant.