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Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation

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Unforced polymer translocation compared to the forced case.

V V Lehtola¹, R P Linna, K Kaski

¹Department of Biomedical Engineering and Computational Science, Helsinki University of Technology, PO Box 9203, Helsinki FIN-02015 TKK, Finland.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 7, 2010

Summary

Unforced polymer translocation dynamics are dimension-independent and insensitive to pore design. Hydrodynamics accelerate the process without altering scaling, and unforced translocation remains near equilibrium, showing universality.

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Area of Science:

Polymer Physics
Computational Biophysics

Background:

Polymer translocation is crucial in biological processes.
Understanding unforced translocation dynamics is key to biological mechanisms.
Simulations are vital for studying complex polymer dynamics.

Purpose of the Study:

Investigate unforced polymer translocation across dimensions.
Compare unforced translocation with forced methods and simplified models.
Analyze the impact of hydrodynamics and pore design on translocation.

Main Methods:

Simulations using Langevin dynamics (2D-4D) and stochastic rotation dynamics (3D).
Comparison with forced translocation and a simplified infinite pore escape model.
Analysis of scaling behavior, mean-squared displacement, and waiting-time distributions.

Main Results:

Unforced translocation scaling is dimension-independent and unaffected by pore design.
Hydrodynamics accelerate unforced translocation but do not change scaling relations.
Unforced translocation remains near equilibrium, exhibiting universality, unlike forced translocation.

Conclusions:

Unforced polymer translocation exhibits distinct characteristics from forced translocation.
Dimensionality and pore geometry have limited impact on unforced translocation dynamics.
Hydrodynamics play a significant role in accelerating unforced translocation, maintaining its near-equilibrium and universal nature.