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Codon Context, Translational Step-Times and Attenuation

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Abstract

Charles Yanofsky and his co-workers have provided us with a detailed understanding of the attenuation mechanism for the regulation of the tryptophan operon of Escherichia coli. This understanding is based on the results of rigorous experimental documentation gathered over the course of the last 15 years. During this time, attenuation mechanisms have also been elucidated for several other operons required for the biosynthesis of amino acids and intermediary metabolites in bacteria. Most recently, Yanofsky and his co-workers have described a model for setting the basal level of transcriptional readthrough at the attenuator of the trp operon. This model, which is supported by a great deal of experimental evidence and has been reviewed elsewhere,1–3 emphasizes the importance of the timing and synchronization of the movement of an RNA polymerase and a ribosome through the leader-attenuator region, i.e., the mechanistic importance of the relative transcription and translation elongation rates for attenuation. While much has been learned about the transit of an RNA polymerase molecule through the leader-attenuator region of the trp operon, little is known about the mechanisms that influence the movement of the ribosome. Indeed, little is known about the mechanisms that influence elongation rates and pausing during the translation of any messenger RNA.

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© 1996 R.G. Landes Company

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Hatfield, G.W. (1996). Codon Context, Translational Step-Times and Attenuation. In: Regulation of Gene Expression in Escherichia coli . Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-8601-8_4

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  • DOI: https://doi.org/10.1007/978-1-4684-8601-8_4

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4684-8603-2

  • Online ISBN: 978-1-4684-8601-8

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