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Single-Molecule Analysis of Genome Uncoating from Individual Human Rhinovirus Particles, and Modulation by Antiviral
Alejandro Valbuena1, Klara Strobl2, Juan Carlos Gil-Redondo1
1Centro de Biología Molecular "Severo Ochoa" (CSIC-UAM), Universidad Autónoma de Madrid, 28049, Madrid, Spain.
Small (Weinheim an Der Bergstrasse, Germany)
|October 8, 2023
Summary
This study used atomic force microscopy to investigate human rhinovirus uncoating. Mechanical force triggers RNA extrusion while maintaining capsid integrity, offering insights for antiviral drug development.
Area of Science:
- Virology
- Biophysics
- Molecular Biology
Background:
- Viral infection initiates with single virion internalization, making stochastic events critical.
- Viral genome uncoating is a key process for infection and a target for antiviral therapies.
Purpose of the Study:
- To investigate the mechanical properties of human rhinovirus uncoating using force spectroscopy.
- To understand the force-induced structural transitions and RNA extrusion dynamics of individual viral particles.
Main Methods:
- Utilized atomic force microscopy (AFM) force spectroscopy to apply mechanical force to individual human rhinovirus particles.
- Analyzed force-induced structural transitions, RNA extrusion, and capsid disruption events.
Main Results:
- High mechanical force induced RNA extrusion from human rhinovirus without capsid damage.
- Lower force caused capsid disruption in RNA-extruded or RNA-free capsids.
- The high-force uncoating event is stochastic, with a moderate free energy barrier, leading to heterogeneous RNA externalization.
Conclusions:
- Mechanical force can trigger viral RNA extrusion, providing a model for uncoating.
- The kinetics of force-induced uncoating correlate with virus infectivity, suggesting potential therapeutic targets.
- Understanding these biophysical mechanisms can inform the development of novel antiviral strategies.
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