Regulation of trp operon in E . coli
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Evolutionary divergence of the Citrobacter freundii tryptophan operon regulatory region: comparison with other enteric bacteria.
The regulatory region of the trp operon of Citrobacter freundii was sequenced and compared with the corresponding regions of other enteric bacteria. Significant differences were noted in the promoter region. These differences are presumably responsible for the weak expression of the cloned trp operon in Escherichia coli. The presumed operator region, although nonfunctional in E. coli, has dyad ...
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متن کاملEvidence suggesting cis action by the TnaC leader peptide in regulating transcription attenuation in the tryptophanase operon of Escherichia coli.
Expression of the tryptophanase (tna) operon in Escherichia coli is regulated by catabolite repression and transcription attenuation. Elevated levels of tryptophan induce transcription antitermination at one or more Rho factor-dependent termination sites in the leader region of the operon. Induction requires translation of a 24-residue coding region, tnaC, located in the 319-nucleotide transcri...
متن کاملThe different roles of tryptophan transfer RNA in regulating trp operon expression in E. coli versus B. subtilis.
Escherichia coli and Bacillus subtilis use different mechanisms of sensing and responding to tryptophan and uncharged tRNA(Trp) as regulatory signals. In E. coli, tryptophan activates a repressor that binds to the trp promoter- operator, inhibiting transcription initiation. In B. subtilis, tryptophan activates an RNA-binding protein, TRAP, which binds to the trp operon leader RNA, causing trans...
متن کاملRegulatory mutants of the tryptophan operon of Salmonella typhimurium.
HE tryptophan ( t rp) operon of Salmonella typhimurium consists of five Tstructural genes regulated as a unit by tryptophan (BLUME and BALBINDER 1966; BAUERLE and MARGOLIN 1966a, 196613; BLUME, WEBER and BALBINDER 1968). The biosynthetic reactions involved and the order of the genes (see Figure 1 ), as well as the regulation of the trp operon have been shown to be identical in Escherichia coli ...
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