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Restoration of ςE activity to spoIIR bacteria by prfB1. β-Galactosidase activity from the ςE-controlled p1 promoter of cotE fused to lacZ in the following BR151 derivatives: □, spoIIR+; ■, spoIIR152; •, spoIIR152 prfB1; ○, spoIIR+ prfB1; and ◊, endogenous β-galactosidase activity of the parent strain BR151 that does not contain the lacZ fusion. ONPG, o-nitrophenyl-β-d-galactopyranoside.
