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The appropriate conditions to switch on the heat shock promoters in Corynebacterium glutamicum were defined by Northern blot analysis. Transcriptional patterns were characterized for the groEL2 gene and the groES-groEL1 and dnaK operons. Transcriptional start points of these genes were determined by primer extension analysis, allowing the identification of CIRCE and HAIR boxes close to the -10 and -35 regions of the promoters. The presence of both CIRCE and HAIR sequences within a single promoter (P-groEL2) in bacteria is described for the first time. In addition, the dnaK promoter showed -10 and -35 sequences similar to those recognized by SigH of Mycobacterium and SigR of Streptomyces close to a second transcription start region with -10 and -35 boxes typical of promoters for housekeeping genes.

journal of bacteriology

Transcriptional Analysis of the groES - groEL1 , groEL2 , and dnaK genes in Corynebacterium glutamicum : Characterization of Heat Shock-Induced Promoters