FIG. 1.
Sequence of the alr promoter region and consensus sequences recognized by mother cell sigma factors. (A) The −10 and −35 regions of alr promoters designated P1 and P2 are labeled and underlined. Transcription start sites identified by primer extension mapping are labeled +1, and bent arrows indicate the direction of transcription. The alr Shine-Dalgarno sequence (S/D) and translation initiation (Met) codon are indicated. (B) Consensus sequences for promoters recognized by σE and σK. In these sequences, capital letters indicate the most conserved residues. nts, nucleotides.