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Quantitative PCR of T7 Bacteriophage from Biopanning
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The effect of genome length on ejection forces in bacteriophage lambda.

Paul Grayson1, Alex Evilevitch, Mandar M Inamdar

  • 1Department of Physics, California Institute of Technology, Pasadena, 91125, USA. grayson@caltech.edu

Virology
|February 14, 2006
PubMed
Summary

Viral DNA ejection forces were measured for bacteriophage lambda mutants. Higher genome length correlated with increased ejection pressure, supporting a force-driven mechanism for DNA release.

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Area of Science:

  • Virology
  • Molecular Biology
  • Biophysics

Background:

  • Viruses, particularly bacteriophages, package large genomes into small capsids under high pressure.
  • Forces up to 60 pN are generated during viral DNA packaging and ejection.
  • The role of these forces in DNA ejection is not fully understood, necessitating quantitative studies.

Purpose of the Study:

  • To investigate the forces involved in bacteriophage lambda DNA ejection.
  • To determine the relationship between viral genome length and ejection force.
  • To validate theoretical models of DNA ejection.

Main Methods:

  • Experimental measurement of DNA ejection forces using two bacteriophage lambda mutants (lambdab221cI26 and lambdacI60) with differing genome lengths.
  • Determination of osmotic pressures at which DNA ejection is inhibited.
  • Comparison of experimental data with theoretical calculations.

Main Results:

  • DNA ejection inhibition pressures were measured as 15 atm for the shorter genome mutant and 25 atm for the longer genome mutant.
  • The results demonstrate a direct correlation between genome length and the force required for DNA ejection.
  • Measured pressures align with theoretical predictions for a force-driven ejection process.

Conclusions:

  • Bacteriophage DNA ejection is a force-driven process influenced by genome length.
  • The measured ejection forces provide quantitative insights into viral DNA packaging and release mechanisms.
  • This study contributes to a deeper understanding of the biophysics governing viral genome dynamics.