Fig. (1) (A) Nucleotide sequences of the promoter region of the clpQ+Y+ operon . The transcriptional start site is shown by arrows. The consensus -10 and -35 sequences recognized by σ32 are underlined. The SD region and the start codon GTG of clpQ+Y+ are as specified. The clpQm1 carries a C to T nucleotide substitution in the region of the RpoH -10 promoter element. The dotted line indicates the deletion of 40 bps in the leader sequence in front of the translational start codon in the clpQm2Δ40::lacZ+ fusion gene. (B) The conserved regions of sequences from the 5’UTR of the clpQ+Y+ genes were aligned among the different bacterial species. The bacteria are present mainly in the Enterobacteriaceae family, i.e. Escherichia coli, Shigella flexneri, Salmonella enterica subsp. Enteritidis, Klebsiella pneumonia, Enterobacter sp., Serratia proteamaculans, Yersinia pestis, Erwinia tasmaniensis and Citrobacter koseri. The sequence that forms a hairpin structure is underlined and the IR sequence is highlighted. The Shine-Darlgarno sequence is boxed and the translational start site is in bold.