FIG. 1.

Overexpression mutations that induce the Psp response. A flag shows the approximate location of each transposon insertion, and the arrow shows the orientation of the tac promoter. Closed flags indicate the mutants used to determine the data shown in Table 3, and they are also listed in Table 1. Open reading frames are shown as horizontal arrows in the direction of their transcription. Genes labeled with numbers indicate the Y. enterocolitica ortholog of the annotated Y. pestis CO92 genome (e.g., 0432 = YPO0432 ortholog). Genes responsible for inducing Φ(pspA-lacZ) expression are boxed (see text).