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Ion-mediated interactions between like-charged polyelectrolytes with bending flexibility.

Yitong Zheng1,2, Cheng Lin2, Jin-Si Zhang3

  • 1Hongyi Honor School, Wuhan University, Wuhan, 430072, China.

Scientific Reports
|December 10, 2020
PubMed
Summary
This summary is machine-generated.

Polyelectrolyte flexibility influences ion-mediated interactions. Increased flexibility reduces repulsion in low salt and weakens attraction in high salt by altering ion configurations and polymer spacing.

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Area of Science:

  • Physical chemistry
  • Biophysics
  • Computational modeling

Background:

  • Ion-mediated interactions are vital for flexible biopolymers like DNA and proteins.
  • The impact of polyelectrolyte flexibility on these interactions remains understudied.

Purpose of the Study:

  • To investigate how polyelectrolyte bending flexibility affects ion-mediated interactions.
  • To model polyelectrolytes within a confined environment simulating an array.

Main Methods:

  • Monte Carlo simulations were employed to calculate potentials of mean force (PMFs).
  • Simulations considered polyelectrolytes with varying bending flexibility under cylindrical confinement.

Main Results:

  • In low salt, flexibility reduced repulsive PMFs between like-charged polyelectrolytes.
  • In high salt, flexibility weakened attractive PMFs, attributed to disrupted ion-bridging.
  • Confinement effects were more pronounced than flexibility effects without confinement.

Conclusions:

  • Polyelectrolyte flexibility significantly modulates ion-mediated interactions by altering conformational space and ion distribution.
  • Flexibility plays a key role in phenomena involving charged polymers, such as DNA condensation and protein association.