Figure 2.

clustalv alignment of the deduced amino acid sequence for S. meliloti BetI (A) and BetC (B). The BetI regulator (SmBetI) is compared with its homologue in E. coli (EcBetI). The choline sulfatase (SmBetC) is compared with the phosphonate monoester hydrolase of Burkholderia caryophilli (BcPehA), the hypothetical YidJ protein of E. coli (EcYidJ), and the arylsulfatases of Pseudomonas aeruginosa (PaAtsa), E. coli (EcAslA), and Klebsiella pneumoniae (KpAtsA). Boxes numbered 1–6 indicate conserved domains in all six sequences. Strictly conserved residues are shown in black, and residues conserved in at least four sequences are shown in gray.