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Related Experiment Videos

A compact RNA tertiary structure contains a buried backbone-K+ complex.

Graeme L Conn1, Apostolos G Gittis, Eaton E Lattman

  • 1Department of Chemistry, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA.

Journal of Molecular Biology
|June 11, 2002
PubMed
Summary

A potassium ion stabilizes a ribosomal RNA hairpin loop by binding to buried phosphate groups. This ion binding is crucial for the RNA

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Area of Science:

  • Structural biology
  • Biochemistry
  • Molecular biology

Background:

  • Ribosomal RNA (rRNA) folding is essential for ribosome function.
  • Tertiary structure formation in RNA often requires specific ion interactions.
  • Understanding ion binding sites is key to elucidating RNA folding pathways.

Purpose of the Study:

  • To investigate the role of ions in the tertiary structure formation of a specific rRNA fragment.
  • To characterize the binding site and energetic contribution of an ion within a complex RNA fold.

Main Methods:

  • X-ray crystallography to determine the high-resolution structure of the rRNA fragment.
  • Analysis of ion coordination and electrostatic potential at the binding site.
  • Thermodynamic calculations to predict binding free energy.

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Main Results:

  • A potassium ion was identified within a hairpin loop, coordinating with six phosphate oxygen atoms.
  • The ion is located within the RNA's solvent-accessible surface, chelating buried phosphate groups.
  • A high binding free energy (approx. -30 kcal/mol) suggests essential occupancy for RNA folding.

Conclusions:

  • The identified potassium ion binding site is critical for stabilizing the rRNA tertiary structure.
  • This ion binding compensates for the energetic cost of burying phosphate groups, enabling complex folds.
  • The findings support previous evidence for monovalent ion-dependent folding where Mg2+ is less competitive.