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Related Experiment Videos

Chaperone-assisted translocation.

Tobias Ambjörnsson1, Ralf Metzler

  • 1NORDITA (Nordic Institute for Theoretical Physics), Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark. ambjorn@nordita.dk

Physical Biology
|October 6, 2005
PubMed
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This study models polymer translocation through nanopores with binding chaperones. We detail the effective force and mean velocity, finding simple results for long polymers and varying chaperone valency.

Area of Science:

  • Polymer physics
  • Biophysics
  • Statistical mechanics

Background:

  • Polymer translocation through nanopores is crucial for biological processes and nanotechnology.
  • Chaperones assist translocation by binding to polymers, but their effect on translocation dynamics requires detailed modeling.
  • Previous models often simplify chaperone interactions or polymer properties.

Purpose of the Study:

  • To investigate the translocation dynamics of a stiff polymer through a nanopore in the presence of reversible binding chaperones.
  • To develop a theoretical framework that accounts for chaperone valency and binding strength.
  • To analyze the effective force and mean translocation velocity under varying conditions.

Main Methods:

  • A one-dimensional master equation was employed to describe the translocation process.

Related Experiment Videos

  • Statistical mechanical averaging was used to determine the effective force, considering chaperone binding states.
  • Finite size corrections to the effective force were derived, with analytical solutions for univalent binding.
  • The mean translocation velocity was analyzed as a function of chaperone binding strength and size.

    • Main Results:

    • The effective force acting on the polymer during translocation was analyzed in detail, considering chaperone valency.
    • Finite size corrections to the effective force were obtained, providing more accurate predictions.
    • The mean translocation velocity was found to depend on chaperone binding strength and size.
    • Simple analytical results for the mean velocity were derived for sufficiently long polymers.

    Conclusions:

    • The study provides a comprehensive theoretical model for polymer translocation influenced by chaperones.
    • Chaperone valency and binding strength significantly impact translocation dynamics.
    • The derived results offer insights into controlling and optimizing polymer translocation processes.
    • The model is applicable to both univalent and multivalent chaperone binding scenarios.