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Probing Single-Molecule Dynamics in Self-Assembling Viral Nucleocapsids.

Thomas Bugea1,2, Roméo Suss1,2, Laetitia Gargowitsch1

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Researchers used single-molecule imaging to observe viral capsid assembly in real time. This technique revealed key binding dynamics and growth kinetics, offering new insights into virus replication.

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Area of Science:

  • Virology
  • Biophysics
  • Molecular Biology

Background:

  • Viruses depend on host cells for replication, involving intricate self-assembly processes.
  • Understanding viral assembly is crucial for developing antiviral strategies.

Purpose of the Study:

  • To observe the real-time growth of icosahedral viral nucleocapsids at the single-molecule level.
  • To analyze the binding and unbinding dynamics of capsid subunits during assembly.

Main Methods:

  • Utilized total internal reflection fluorescence microscopy (TIRFm).
  • Tracked fluorescently labeled capsid subunits binding to immobilized viral RNA.
  • Employed a step-detection algorithm and statistical analysis for kinetic parameter estimation.

Main Results:

  • Estimated equilibrium binding rates and mean residence times of capsid subunits.
  • Determined rate constants for viral growth kinetics from nonequilibrium measurements.
  • Observed accelerated growth due to the electrostatic screening effect of monovalent salts.

Conclusions:

  • Single-molecule fluorescence imaging provides unprecedented molecular-level insights into virus self-assembly.
  • This methodology is vital for studying viral assembly in complex, cell-like environments.
  • Findings advance our understanding of fundamental viral replication mechanisms.