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Related Experiment Videos

Rapid compaction during RNA folding.

Rick Russell1, Ian S Millett, Mark W Tate

  • 1Department of Biochemistry, Stanford University, Stanford, CA 94305, USA.

Proceedings of the National Academy of Sciences of the United States of America
|April 4, 2002
PubMed
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Tetrahymena group I RNA rapidly compacts within one second, forming a molten globule-like intermediate before specific tertiary contacts emerge. This suggests RNA folding involves an initial nonspecific collapse.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Computational Biology

Background:

  • Understanding RNA folding is crucial for deciphering its biological functions.
  • Group I introns, like Tetrahymena group I RNA, are complex ribozymes with intricate structures.
  • Previous studies have explored RNA folding pathways, but time-resolved global dynamics remain less understood.

Purpose of the Study:

  • To elucidate the time-resolved global folding process of Tetrahymena group I RNA.
  • To characterize the intermediate states and conformational dynamics during RNA folding.
  • To compare RNA folding intermediates with those observed in protein folding.

Main Methods:

  • Small Angle X-ray Scattering (SAXS) for time-resolved structural analysis.
  • Coarse-grained computer simulations for modeling RNA dynamics.

Related Experiment Videos

  • Integration of experimental and computational approaches to cover a wide timescale.

    • Main Results:

    • Observed significant RNA compaction on the millisecond timescale.
    • Demonstrated that global shape changes complete within one second, preceding tertiary contact formation.
    • Identified a nonspecifically collapsed RNA intermediate, analogous to protein molten globules.

    Conclusions:

    • Tetrahymena group I RNA folding initiates with rapid, nonspecific compaction.
    • The RNA searches for tertiary contacts within a constrained conformational space post-compaction.
    • The study provides a time-resolved model for RNA folding, highlighting similarities with protein folding intermediates.