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Mutations that affect activity of the Rhizobium meliloti trpE(G) promoter in Rhizobium meliloti and Escherichia coli



Mutations that affect activity of the Rhizobium meliloti trpE(G) promoter in Rhizobium meliloti and Escherichia coli



Journal of Bacteriology 173(18): 5831-5836



The cloned Rhizobium meliloti trpE(G) gene is not expressed in Escherichia coli. Oligonucleotide-directed mutagenesis was used to introduce base substitution mutations in the promoter region of this gene. Three separate mutations that increased homology of the putative - 10 region of this promoter with the E. coli - 10 promoter consensus sequence by 1 bp converted this promoter to an active promoter in E. coli. A deletion extending to position -43 from the 5' side had a minor effect on transcription in R. meliloti. However, transcription was nearly eliminated when a deletion extended to position -33, indicating that the crucial domain of the R. meliloti trpE(G) promoter begins in the region downstream of position -43. The R. meliloti trpE(G) promoter has two regions that show homology with the E. coli -35 and -10 promoter consensus sequences. Mutations in these putative -35 and -10 regions, but not in the spacer region, affected promoter strength in R. meliloti. By comparing four known R. meliloti promoter sequences, we identified a highly conserved trimer near position -35 (5'-TTG-3') but no noticeably conserved sequence near position -10.

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Accession: 007579411

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PMID: 1885552


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