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Related Experiment Videos

The lambda holin accumulates beyond the lethal triggering concentration under hyperexpression conditions

D L Smith1, C Y Chang, R Young

  • 1Department of Biochemistry and Biophysics, Texas A&M University, College Station 77843, USA.

Gene Expression
|May 8, 1998
PubMed
Summary
This summary is machine-generated.

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Bacteriophage holins form membrane lesions to release progeny virions. A novel expression system allows production of large quantities of S holin protein for biochemical study.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Bacteriophages employ holin proteins to create lesions in the host cytoplasmic membrane, leading to cell lysis and progeny virion release.
  • Holin proteins are small, integral membrane proteins with transmembrane domains responsible for forming pores in the inner membrane.
  • The S protein of bacteriophage lambda serves as a model holin, with its activity regulated by translational control elements.

Purpose of the Study:

  • To develop an expression system for producing biochemically useful quantities of the bacteriophage lambda S holin protein.
  • To characterize this expression system and its implications for understanding holin function and lytic cycle regulation.

Main Methods:

  • Utilized a plasmid-based expression system featuring the T7 RNA polymerase promoter and a consensus ribosome binding site.

Related Experiment Videos

  • Induction of S protein expression under this system.
  • Characterization of the expressed S protein quantities.

    • Main Results:

    • Achieved Coomassie blue-detectable quantities of S protein, representing a ~100-fold increase over normal lethal levels.
    • Demonstrated the efficacy of the T7 promoter and RBS system for high-level holin expression.
    • Provided a system for obtaining biochemically relevant amounts of holin protein.

    Conclusions:

    • The developed expression system enables the production of significant quantities of S holin protein, facilitating further biochemical and functional studies.
    • This system overcomes limitations of previous expression methods that yielded insufficient protein amounts.
    • The findings support and refine current models of holin-mediated membrane permeabilization and bacteriophage lysis.