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Electrical Stimulus Controlled Binding/Unbinding of Human Thrombin-Aptamer Complex.

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Applying a positive electric field can successfully detach human thrombin from its DNA aptamer. This electrical stimulus modulates molecular interactions, offering a way to control thrombin-aptamer association.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Computational Chemistry

Background:

  • The interaction between human thrombin and its DNA aptamer is crucial in various biological processes and therapeutic applications.
  • Understanding how external stimuli affect this complex is key to developing novel control mechanisms.

Purpose of the Study:

  • To investigate the effect of electrostatic potential/electric field on the binding and unbinding dynamics of the human thrombin-aptamer complex.
  • To determine the feasibility of using electrical stimulus to modulate thrombin-aptamer association.

Main Methods:

  • Combined continuum analysis and atomistic molecular dynamics simulations.
  • Umbrella sampling simulations to calculate free energy of binding.
  • Analysis of hydrogen bonding and non-bonded interaction energies.

Main Results:

  • Positive electric fields were computationally shown to successfully unbind thrombin from the DNA aptamer.
  • A decrease in the free energy of binding was observed in the presence of positive electric fields.
  • Applied electric fields, shifting from negative to positive values, reduced interaction energies within the complex.

Conclusions:

  • Electrical stimulus can effectively modulate the molecular interactions within the thrombin-aptamer complex.
  • Electric fields offer a viable method for controlling the association and dissociation of thrombin and its DNA aptamer.