FIG. 1.
VpsR homologues and functional motifs. (A) Map of the vpsR region on the V. cholerae O1 El Tor chromosome. (B) Amino acid sequence alignment of VpsR from V. cholerae O1, NtrC from serovar Typhimurium (P41789), HydG from serovar Typhimurium (P25852), and AlgB from P. aeruginosa (P23747). Amino acids identical in all four sequences are shaded in black. The star denotes a conserved aspartate residue and a putative phosphorylation site. Predicted RpoN interaction sites are indicated by heavy lines, and a C-terminally located helix-turn-helix (HTH) motif is shown by the thin line.