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Alignment of amino acid sequences of RegA of Rhodobacter capsulatus (Rba. cap) (55), Rhodovulum sulfidophilum (Rdv. sul), and Roseobacter denitrificans (Rsb. den), PrrA of Rhodobacter sphaeroides (Rba. sph) (19), ActR of Rhizobium meliloti (R. mel) (65), and RegR of Bradyrhizobium japonicum (B. jap) (5). Asterisks indicate identical amino acids. Residues considered functional and a predicted helix-turn-helix DNA-binding motif are boxed.
