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Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation

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Published on: February 12, 2022

Force-induced misfolding in RNA.

M Manosas¹, I Junier, F Ritort

¹Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 5, 2009

Summary

This summary is machine-generated.

Mechanical forces can induce RNA misfolding, favoring non-native structures. A new model explains RNA folding kinetics and misfolding pathways observed in single-molecule experiments, revealing force-induced hairpin formation in RNAS15.

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Area of Science:

Biophysics
Molecular Biology
Computational Biology

Background:

RNA folding is a complex kinetic process influenced by base pairing and thermal forces.
Understanding RNA folding kinetics is crucial for biophysics but limited by intricate molecular interactions.
Single-molecule mechanical pulling offers novel insights into nucleic acid folding.

Purpose of the Study:

Investigate RNA folding and misfolding mechanisms under mechanical force.
Develop a model to interpret force-extension curves from single-molecule experiments.
Analyze force-induced misfolding in the RNAS15 molecule.

Main Methods:

Introduced a minimal set model to reproduce experimental force-extension patterns.
The model uses two fitting parameters: attempt frequency and free-energy correction.
Applied the model to analyze single-molecule pulling experiments on RNAS15.

Main Results:

Demonstrated force-induced misfolding in RNAS15, favoring a stable non-native hairpin.
The model accurately reproduced unfolding/refolding curves and breakage force distributions.
Quantified misfolding probability under mechanical stress.

Conclusions:

Mechanical forces can drive RNA into stable misfolded states.
The developed model provides a quantitative framework for RNA folding kinetics.
Insights into RNA misfolding mechanisms are crucial for understanding RNA function and disease.