Genetic Analysis of the Attenuator of the Rhizobium Meliloti TrpE(G) Gene

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1991 Jun 1

PMID 2045362

Citations 4

Authors

Y M Bae

G V Stauffer

Affiliations

Soon will be listed here.

Abstract

It was previously reported that transcription of the Rhizobium meliloti trpE(G) gene starts at the adenine residue of the AUG codon of the leader peptide coding sequence (trpL), suggesting that translation of the trpL sequence starts without the Shine-Dalgarno sequence. We constructed mutations replacing the AUG codon of the trpL sequence with AAG or ACG. These mutations reduced the expression of a trpL'-'lacZ fusion gene to 0.1 and 0.2% of the wild-type level, respectively, indicating that the AUG codon is the translation initiation codon for the trpL coding sequence. In addition, these mutations, as well as a mutation converting the eighth codon (UCG) of the trpL sequence to UGA, abolished regulation by attenuation when introduced upstream of the tandem tryptophan codons in a trpE'-'lacZ fusion. Mutations affecting the stability of the probable antiterminator and terminator secondary structures in trpL mRNA were also constructed. Studies using these mutations indicate that the attenuator of R. meliloti functions in a way analogous to that of the Escherichia coli trp attenuator.

Citing Articles

Reprograming of sRNA target specificity by the leader peptide peTrpL in response to antibiotic exposure.

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Transcription attenuation-derived small RNA rnTrpL regulates tryptophan biosynthesis gene expression in trans.

Melior H, Li S, Madhugiri R, Stotzel M, Azarderakhsh S, Barth-Weber S Nucleic Acids Res. 2019; 47(12):6396-6410.

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Amplification of trpEG: adaptation of Buchnera aphidicola to an endosymbiotic association with aphids.

Lai C, Baumann L, Baumann P Proc Natl Acad Sci U S A. 1994; 91(9):3819-23.

PMID: 8170994 PMC: 43673. DOI: 10.1073/pnas.91.9.3819.

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

Bae Y, Stauffer G J Bacteriol. 1991; 173(18):5831-6.

PMID: 1885552 PMC: 208316. DOI: 10.1128/jb.173.18.5831-5836.1991.

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