FIG. 3.

Alignment of CadR of P. putida 06909 with the MerR family of activator-repressors, including the predicted product of gene PA3689 of P. aeruginosa (51), ZntR of E. coli (6), and MerR of Tn501 in pVS1 of P. aeruginosa (31). Identical bases are shown as white letters on a dark background. Asterisks are Hg(II)-binding cysteine residues of MerR (62), and numbers 1 to 7 are the heptad repeats that form helical structures to promote homodimer formation (6). The identities (ID) of the amino acid sequences to CadR are indicated.