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The functional stability of the lacZ transcript is sensitive towards sequence alterations immediately downstream of the ribosome binding site

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Summary

Various synthetic DNA sequences were inserted downstream of the fourth codon of the Escherichia coli lacZ gene on plasmids containing a hybrid lacZ-galK operon. Several different sequences, one as short as 10 bp, reduced the functional stability of the lacZ message three- to fourfold, whereas others had little or no effect. Introduction of synthetic sequences into a plasmid containing the intact lac operon resulted in similar reductions of mRNA stability. The sequence alterations also reduced the translational efficiency and transcription through lacZ as monitored by measurements of galactokinase synthesis from the downstream galK gene. There was no correlation between the average translational frequency and the stability of the lacZ message indicating that some of the inserted sequences reduced mRNA stability directly and not as a consequence of their effect on translation. The reduction of transcription through the lacZ gene correlated with the reduction of translation in agreement with current models of transcriptional polarity.

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  1. Institute of Microbiology, University of Copenhagen, Øster Farigmagsgade 2A, DK-1353, Copenhagen K, Denmark

    Carsten Petersen

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  1. Carsten Petersen
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Communicated by A. Böck

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Petersen, C. The functional stability of the lacZ transcript is sensitive towards sequence alterations immediately downstream of the ribosome binding site. Mol Gen Genet 209, 179–187 (1987). https://doi.org/10.1007/BF00329856

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  • DOI: https://doi.org/10.1007/BF00329856

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