FIG. 4.

Transcriptional activation of bvgR. Alkaline phosphatase activities of transcriptional fusions of the E. coli gene encoding alkaline phosphatase to ORF1 and ORF2 are shown after growth in the presence and absence of modulators. Black bars, no modulator; dotted bars, 50 mM MgSO₄; diagonally striped bars, 20 mM nicotinic acid; white bar, growth at 25°C. Activities are reported relative to strain TM1316 grown in the absence of MgSO₄ (153.26 units). All reported values are averages of at least four independent assays.