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Related Experiment Videos

Molecular Dynamics Simulation of a RNA Aptasensor.

Min Ruan1,2, Mahamadou Seydou1, Vincent Noel1

  • 1Université Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR 7086, CNRS, 15 rue J-A de Baïf, 75013 Paris, France.

The Journal of Physical Chemistry. B
|April 1, 2017
PubMed
Summary

RNA aptamers lose binding affinity when immobilized on surfaces. Molecular dynamics simulations reveal that anisotropic ion distribution causes structural changes, leading to reduced aptamer biosensor efficiency.

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Area of Science:

  • Biophysical Chemistry
  • Nanotechnology
  • Molecular Biology

Background:

  • Single-stranded RNA aptamers are promising biosensor tools.
  • Immobilization on surfaces often decreases aptamer binding affinity.
  • Understanding this affinity loss is crucial for biosensor design.

Purpose of the Study:

  • To investigate the molecular mechanisms behind aptamer affinity loss upon surface immobilization.
  • To simulate the Flavin mononucleotide aptamer-FMN system under various conditions.

Main Methods:

  • Molecular dynamics (MD) simulations were performed.
  • Simulations included the aptamer in solution, with a thymidine linker (T6), and immobilized on a gold surface.
  • Free energy of binding calculations were used to assess affinity.

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Main Results:

  • MD simulations accurately reproduced experimental solution structures and binding free energies.
  • The T6 linker did not perturb FMN recognition.
  • Immobilized aptamers maintained a parallel orientation to the surface.
  • Anisotropic sodium ion distribution induced aptamer structural reorganization, causing affinity loss.

Conclusions:

  • Surface immobilization of RNA aptamers can lead to affinity loss due to altered ionic environments.
  • These findings offer insights for designing more efficient and selective nucleic acid-based biosensors.
  • The study highlights the importance of considering ionic effects in biosensor development.