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Exploring ssDNA translocation through α-hemolysin using coarse-grained steered molecular dynamics.

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Coarse-grained molecular dynamics simulations reveal key factors influencing single-stranded DNA (ssDNA) translocation through protein nanopores. DNA charge and orientation significantly impact translocation speed and dynamics, offering insights into experimental observations.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Computational Biology

Background:

  • Protein nanopores are effective for single-molecule studies, especially for single-stranded DNA (ssDNA) translocation.
  • Previous experiments distinguished base types and ssDNA orientation but lacked microscopic translocation details.
  • All-atom molecular dynamics (MD) simulations are limited by timescale, hindering examination of experimental phenomena.

Purpose of the Study:

  • To investigate the microscopic details of ssDNA translocation through nanopores using coarse-grained (CG) MD simulations.
  • To explore the impact of sequence length, orientation, and DNA charges on ssDNA translocation dynamics.
  • To analyze the conformational dynamics of ssDNA during translocation.

Main Methods:

  • Steered MD simulations utilizing the MARTINI CG force field.
  • Simulating ssDNA translocation through α-hemolysin nanopores.
  • Analyzing translocation dynamics and conformational changes.

Main Results:

  • CG MD simulations effectively capture experimental properties of ssDNA translocation, including varied translocation times per base.
  • Phosphate charges on the DNA molecule are critical for translocation dynamics and affect the translocation rate.
  • ssDNA orientation influences translocation rate due to conformational changes within the nanopore.

Conclusions:

  • CG MD simulations provide valuable insights into the complex mechanisms of ssDNA translocation.
  • Sufficient statistical data from CG MD is essential for understanding the diverse translocation processes.
  • The study highlights the importance of DNA charge and orientation in nanopore translocation studies.