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Following Cell-fate in E. coli After Infection by Phage Lambda
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Translation of the prophage lambda cl transcript.

C S Shean1, M E Gottesman

  • 1Institute of Cancer Research, Columbia University College of Physicians and Surgeons, New York, New York 10032.

Cell
|August 7, 1992
PubMed
Summary
This summary is machine-generated.

Mutations affecting ribosomal protein S2 enhance gene translation by improving interactions with specific RNA sequences. This finding sheds light on the regulation of gene expression in bacteria.

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Area of Science:

  • Molecular Biology
  • Bacteriology
  • Genetics

Background:

  • Bacterial gene expression is tightly regulated at the translational level.
  • Ribosomal protein S2 plays a role in translation initiation and efficiency.
  • The lambda phage cl gene is crucial for maintaining lysogeny.

Purpose of the Study:

  • To investigate the role of ribosomal protein S2 in the translation of the lambda phage cl gene.
  • To identify sequence features of the cl transcript involved in enhanced translation.
  • To elucidate the mechanism by which S2 deficiency impacts translation.

Main Methods:

  • Genetic analysis of rpsB mutations in lambda lysogens.
  • RNA-protein interaction studies using 30S ribosomal subunits.
  • Analysis of cl transcript features, including leader sequence and downstream box.

Main Results:

  • Mutations in rpsB, reducing ribosomal protein S2 levels, enhance cl translation.
  • Enhanced translation requires the absence of a leader sequence and the presence of a downstream box in the cl transcript.
  • 30S ribosomal subunits lacking S2 exhibit increased binding efficiency to the cl transcript.

Conclusions:

  • Reduced levels of ribosomal protein S2 promote cl translation in lambda lysogens.
  • The cl transcript's downstream box and lack of a leader are essential for S2-mediated translational enhancement.
  • S2 deficiency may alter 16S rRNA structure, facilitating improved binding to the cl downstream box and enhancing translation.