PMID:1311089: Difference between revisions
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|{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=1311089 PubMed] | |{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=1311089 PubMed] | ||
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==Significance {{HelpIcon|Help:Literature}} == | ==Significance {{HelpIcon|Help:Literature}} == | ||
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==Annotations {{HelpIcon|Help:Literature}}== | ==Annotations {{HelpIcon|Help:Literature}}== | ||
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Revision as of 22:04, 25 April 2008
Schnetz, K and Rak, B (1992) IS5: a mobile enhancer of transcription in Escherichia coli.Proc. Natl. Acad. Sci. U.S.A. 89:1244-8
| Abstract | The cryptic bgl operon of Escherichia coli is activated by the spontaneous insertion of mobile DNA elements. Screening of a collection of such mutations revealed insertion of the 1195-base-pair element IS5 into various positions both upstream and downstream of the bgl promoter P0. Activation of the operon was in all cases attributable to enhancement of P0 activity. Introduction of internal deletions into IS5 almost completely abolished P0 enhancement, demonstrating that enhancement is not simply the result of mutational inactivation of some inhibitory sequences. Intact copies of IS5 in trans restored the enhancing activity of the deletion derivatives. The trans-activator is encoded by IS5 gene ins5A, an essential transposition function. Activation of gene expression by means of interaction of a defective mobile element in cis with functions encoded by a nondefective element in trans has so far been described only for a maize controlling element. |
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