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(A) Organization of gad genes in L. monocytogenes EGD-e. The hairpin structures indicate putative terminators. The numbering of the open reading frames is according to the L. monocytogenes EGD-e genome sequence (15). (B) Transcriptional analysis of gad genes in L. monocytogenes EGD-e (lanes 1 and 2) and the ΔsigB mutant (lanes 3 and 4) in exponential-phase cells (lanes 1 and 3) and cells exposed to pH 4.5 for 1 h (lanes 2 and 4).
