FIG 4.

Model of regulation of the aprE and nprE promoters by the combined actions of CodY, ScoC, and AbrB. The sizes of the circles reflect the relative amounts of the active forms of the proteins. The solid vertical lines indicate relatively strong effects on transcription. Dotted lines indicate relatively weak effects on transcription. The boldness of the horizontal arrows indicates the relative strengths of transcription of the target genes, and the numbers show activities of the corresponding lacZ fusions during exponential growth in TSS+16 aa medium.