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Related Experiment Videos

Dynamics of DNA ejection from bacteriophage.

Mandar M Inamdar1, William M Gelbart, Rob Phillips

  • 1Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California, USA.

Biophysical Journal
|May 9, 2006
PubMed
Summary

Bacterial virus (phage) DNA ejection into host cells is driven by capsid stress and protein binding forces. These factors significantly accelerate DNA translocation through membranes, offering insights for in vitro experiments.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Virology

Background:

  • Bacterial virus (phage) DNA ejection is a key macromolecular translocation process.
  • DNA translocation across membranes involves complex physical forces.

Purpose of the Study:

  • To model the generalized diffusion equation for phage DNA ejection.
  • To quantify the speedup of DNA translocation due to capsid stress and protein binding.

Main Methods:

  • Formulation of a generalized diffusion equation incorporating pushing and pulling forces.
  • Estimation of translocation speedups based on physical parameters.
  • Investigation of confinement effects during DNA injection.

Main Results:

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  • Capsid stress is the primary driver in early ejection stages.
  • Binding proteins become dominant in later stages of translocation.
  • Confinement effects influence DNA injection into small volumes.

    • Conclusions:

    • The developed model explains DNA ejection dynamics in phages.
    • Results suggest tunable in vitro experiments to study phage DNA ejection mechanisms.
    • Understanding these forces can inform future nanotechnology applications.