FIG. 7.

Effects of yciC and ycdH mutations on regulation. β-Galactosidase (β-gal) assays were performed for strains containing the yciC-cat-lacZ (A) or ycdH-cat-lacZ (B) transcriptional fusion after overnight growth in LZMM supplemented with Zn at the indicated concentration. The fusions were assayed in the wild-type (○) and the ycdH (□) and yciC ycdH (▴) mutant backgrounds. In the yciC mutant background, the results were indistinguishable from those for the wild type (not shown). The curves shown are best fits to the experimental data as described in Materials and Methods.