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This study extends RNA folding landscape analysis to include pseudoknotted structures, revealing that pseudoknotted RNAs often exhibit pseudoknotted intermediates, though their impact varies individually.

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Area of Science:

  • Computational Biology
  • Biophysics
  • Bioinformatics

Background:

  • RNA function depends on folding pathways and intermediates, not just ground state structures.
  • Understanding rugged RNA folding landscapes is crucial for modeling RNA dynamics.
  • Existing coarse-graining methods often exclude pseudoknotted RNA structures.

Purpose of the Study:

  • To generalize the basin hopping graph (BHG) framework to incorporate pseudoknotted RNA structures.
  • To investigate the impact of pseudoknotted structures on RNA folding pathways.
  • To compare folding behaviors with and without pseudoknotted intermediates.

Main Methods:

  • Generalized the basin hopping graph (BHG) framework to include pseudoknotted RNA structures.
  • Systematically studied RNA folding behavior with and without pseudoknotted intermediates.
  • Analyzed the occurrence and influence of pseudoknotted intermediates on folding trajectories.

Main Results:

  • RNAs with pseudoknotted ground states tend to have more pseudoknotted folding intermediates.
  • The presence and impact of pseudoknotted intermediates are highly RNA-specific.
  • No general rule could be inferred regarding the influence of pseudoknotted intermediates.

Conclusions:

  • The generalized BHG framework provides a new tool for analyzing pseudoknotted RNA folding landscapes.
  • Pseudoknots can play a role in RNA folding pathways, but their influence is context-dependent.
  • Further research is needed to understand the specific roles of pseudoknotted intermediates in RNA function.