Figure 4.
(A) PlyPalA inhibition by the metal cation chelator EDTA. After adding P. larvae and before adding lysin, EDTA was added to various concentrations as ratios of the known concentration of Mg2+ (5.0 mM). Error bars represent standard deviations (n = 3). (B) PlyPalA activity with Mn2+, Co2+, and Ca2+ cofactors. Cations were added to a concentration of 5.0 mM. The (-) control represents lysis with no cation added. Readings were taken once per minute for 30 mins. Error bars represent standard deviations (n = 3).