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Viruses like brome mosaic virus (BMV) gain mechanical strength under osmotic stress but weaken past a threshold. This response to molecular crowding influences viral stability and disassembly within cells.

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Area of Science:

  • Virology
  • Biophysics
  • Structural Biology

Background:

  • Viruses possess a protective protein shell (capsid) that shields the genome but can lead to osmotic stress due to external macromolecule concentration.
  • Osmotic stress effects on the physical properties of single-stranded RNA viruses, the most abundant class, are largely unknown.
  • Understanding viral responses to osmotic stress is crucial for comprehending viral infection mechanisms.

Purpose of the Study:

  • To investigate the mechanical properties and structural stability of brome mosaic virus (BMV) under controlled molecular crowding conditions.
  • To explore how osmotic pressure influences the physical behavior of a model positive-sense RNA icosahedral virus.
  • To elucidate the mechanochemical response of BMV to varying osmotic environments.

Main Methods:

  • Studied brome mosaic virus (BMV) under controlled molecular crowding conditions to simulate osmotic stress.
  • Measured the mechanical properties and structural stability of BMV as a function of external osmotic pressure.
  • Utilized biophysical techniques to analyze viral shell responses to osmotic challenges.

Main Results:

  • BMV exhibits increased mechanical reinforcement under low external osmotic pressure.
  • BMV begins to yield and shows reduced stability beyond a specific osmotic pressure threshold.
  • The observed mechanochemical behavior is attributed to molecular crowding affecting the entropy of viral shell fluctuation modes.

Conclusions:

  • The viral RNA likely imposes a negative internal osmotic pressure, prestressing the capsid.
  • Molecular crowding significantly impacts viral mechanical properties and structural stability.
  • Findings provide new insights into viral disassembly mechanisms within the crowded cellular environment.