FIG. 1.

The fliF and motAB loci. The physical maps are derived from the nucleotide sequences. Gene designations, which are adopted from the closest E. coli homolog, are superimposed on the open reading frame (ORF) map; full bars indicate stop codons, and small bars indicate ATG codons. ORFs coding for switch and motor genes are dark. Arrows indicate the direction of transcription. The coding sequence upstream of fliF codes for a potential transcriptional regulator resembling E. coli GcvA. The sequence upstream of motA codes for a potential polypeptide with homology to the small subunit of E. coli exodeoxyribonuclease (type VII). The sequence downstream of motB codes for a potential homolog of S. enterica serovar Typhimurium ThiI. Regions containing the fliG and fliMN genes were subcloned using the restriction sites indicated to make plasmids pLM2192 and pLM2293.