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This study reveals how ions regulate RNA folding and ribosome function. Transient ion interactions, particularly magnesium, control large-scale ribosomal movements by altering the energy landscape and kinetics.

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Area of Science:

  • Computational Biology
  • Biophysics
  • Molecular Biophysics

Background:

  • Ions are crucial for RNA folding, but their role in dynamic conformational changes remains unclear.
  • Understanding ion-mediated interactions is key to deciphering RNA's functional mechanisms.

Purpose of the Study:

  • To develop a theoretical model for simulating ion-RNA interactions at all-atom resolution.
  • To investigate the influence of ions on RNA conformational rearrangements and biological processes.

Main Methods:

  • Developed a theoretical model incorporating explicit electrostatics and ions (K+, Cl-, Mg2+).
  • Validated the model using established RNA systems (58-mer and Ade riboswitch).
  • Applied the model to simulate the yeast ribosome and analyze ion-dependent energy landscapes.

Main Results:

  • The model accurately captures concentration-dependent ionic environments and ion types (chelated, hydrated).
  • Simulations revealed that millimolar changes in magnesium chloride ([MgCl2]) affect ribosome intersubunit rotation energetics.
  • Ion concentration shifts alter the distribution of rotational states and kinetics by over an order of magnitude.

Conclusions:

  • Transient ion-mediated interactions, including inner-shell and outer-shell, directly regulate ribosomal subunit rotation.
  • This provides a physical basis for how ions modulate large-scale biological processes like protein synthesis.
  • The findings highlight the critical role of the ionic environment in RNA dynamics and function.