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Related Experiment Videos

Dominance in lambda S mutations and evidence for translational control.

R Raab1, G Neal, C Sohaskey

  • 1Department of Biology, Texas A & M University, College Station 77843.

Journal of Molecular Biology
|January 5, 1988
PubMed
Summary
This summary is machine-generated.

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Bacteriophage lambda lysis gene S mutations suggest its product oligomerizes for lethal membrane effects. A structure-directed initiation site (sdi) controls start codons, influencing polypeptide length and lethality.

Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • The lysis gene S of bacteriophage lambda encodes a protein essential for viral propagation.
  • Understanding the regulation of lysis gene expression is crucial for controlling bacteriophage activity.

Purpose of the Study:

  • To investigate the oligomerization state of the bacteriophage lambda S gene product (gpS).
  • To identify and characterize regulatory elements controlling the initiation of S gene translation.
  • To elucidate the mechanism by which gpS mediates lethal membrane effects.

Main Methods:

  • Phenotypic analysis of point mutations in the lysis gene S and upstream regions.
  • Site-directed mutagenesis to alter initiation codons.
  • Analysis of gene product oligomerization and membrane effects.

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Main Results:

  • Many S alleles exhibit dominant character, implying gpS oligomerization.
  • Mutations 5' to the coding sequence define a structure-directed initiation (sdi) site.
  • The sdi site regulates initiation codon choice via mRNA secondary structure, affecting polypeptide length and lethality.
  • Altering the first codon resulted in a more lethal S allele inducing lysis sooner.

Conclusions:

  • gpS oligomerizes to achieve its lethal membrane effect.
  • mRNA secondary structure at the sdi site controls translation initiation, determining gpS polypeptide length and function.
  • The findings provide a model for S gene expression regulation and offer insights into bacteriophage lysis mechanisms.