FIG. 7.
Effects of upstream deletions on ulaG and ulaA expression. The open arrows indicate the extents and directions of transcription of the genes included in the ula regulon. The regulatory elements recognized by UlaR (O1, O2, O3, and O4), IHF, and CRP between ulaG and ulaA are represented by boxes. Deleted promoter fragments are represented by lines, and the corresponding lacZ fusions are labeled on the left. The designations of the deletions are based on the number of base pairs present upstream of the 5′ end, marked by an arrow labeled +1. The 5′ end corresponding to the complementary ulaG coding strand is in parentheses. β-Galactosidase activity values under the different growth conditions are indicated in the table on the right.