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Hexahydrated Mg2+ Binding and Outer-Shell Dehydration on RNA Surface.

Tao Yu1, Shi-Jie Chen2

  • 1Department of Physics, Jianghan University, Wuhan, Hubei, China; Departments of Physics and Biochemistry and MU Informatics Institute, University of Missouri, Columbia, Missouri.

Biophysical Journal
|March 29, 2018
PubMed
Summary
This summary is machine-generated.

Magnesium (Mg2+) ions partially dehydrate when binding to RNA, retaining their inner water shell. This interaction is crucial for RNA folding and stronger than monovalent ions.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Metal ions, particularly Mg2+, are essential for RNA folding and stability.
  • Hydration shells around metal ions can change upon interaction with biomolecules.

Purpose of the Study:

  • To investigate the dehydration of hexahydrated Mg2+ ions upon binding to RNA using molecular dynamics simulations.
  • To quantify the relationship between Mg2+ dehydration and its binding environment in RNA.

Main Methods:

  • Molecular dynamics (MD) simulations of Mg2+-RNA interactions.
  • Free energy perturbation calculations.
  • Analysis of ion-RNA binding sites and hydration states.

Main Results:

  • Mg2+ ions undergo partial dehydration, especially in the outer hydration shell, when bound to RNA grooves.
  • The innermost hydration shell of Mg2+ remains intact due to strong electrostatic attraction, facilitating water-mediated RNA interactions.
  • Mg2+ binding is significantly stronger than that of monovalent ions (Na+, K+).
  • A linear correlation was found between Mg2+ dehydration free energy and the inverse distance to RNA phosphate groups.

Conclusions:

  • Mg2+ dehydration is a key factor in its strong binding to RNA.
  • The findings provide a quantitative model for ion-RNA interactions relevant to RNA folding.
  • Results offer insights into the role of divalent cations in nucleic acid structure.