FIG. 1.

Stimulation of ileS (A) and valS (B) transcription in response to, respectively, mupirocin treatment (plus) and amino acid (AA) deprivation [minus (isoleucine plus valine)] of NZ131 wild-type and relA mutant cells. Control cells were incubated in BHI broth in the absence of mupirocin (minus) for the indicated period of time or grown in complete CDM (+AA). The sizes of the hybridizing bands in the Northern blots are consistent with the genetic organization of the two transcription units shown below the blots.