Table 5.

Effect of a codY mutation on the expression of the bkd operon

StrainRelevant genotypeβ-Galactosidase activity (Miller units/mg of protein) in the following minimal medium:
MM + glucoseMM + glucose + isoleucine (20 mM)MM + glucose + 0.2% Casamino AcidsMM + glucose + 0.2% Casamino Acids + isoleucine (20 mM)
QB7501 ptb′-′lacZ 201,97545575
QB7522 ptb′-′lacZ codY::erm 1402,2557652,325