Interaction between the holin S105 and holin inhibitor S107 in the bacterial membrane. Protein samples were prepared and analyzed by Western blotting as described in the legend to Fig. 3. Lane 1, molecular weight standards; lane 2, MC4100(λCmΔSR) + pKB1 (Sam7); lane 3, MC4100(λCmΔSR) + pS107; lane 4, MC4100(λCmΔSR) + pS105τ94; lane 5, mixed cultures MC4100(λCmΔSR) + pS105τ94 and MC4100(λCmΔSR) + pS107; lane 6, MC4100(λCmS107) + pS105τ94. Labeling of the panel is as described in the legend to Fig. 3.