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Fast viral dynamics revealed by microsecond time-resolved cryo-EM.

Oliver F Harder1, Sarah V Barrass1, Marcel Drabbels1

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|September 13, 2023
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Summary
This summary is machine-generated.

Microsecond time-resolved cryo-electron microscopy (cryo-EM) now allows direct observation of fast protein dynamics. This breakthrough reveals the rapid mechanics of cowpea chlorotic mottle virus (CCMV) capsid changes, advancing our understanding of protein function.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Virology

Background:

  • Observing proteins in action is crucial for understanding their function, but has been limited by technological constraints.
  • Current methods lack the temporal resolution to capture rapid protein dynamics.

Purpose of the Study:

  • To demonstrate the capability of microsecond time-resolved cryo-electron microscopy (cryo-EM) for observing fast protein dynamics.
  • To elucidate the mechanics of cowpea chlorotic mottle virus (CCMV) capsid conformational changes.

Main Methods:

  • Development and application of microsecond time-resolved cryo-EM.
  • Induction of rapid conformational changes in CCMV via a pH jump.
  • High-resolution imaging to capture dynamic events.

Main Results:

  • Observed microsecond-timescale contraction of the CCMV capsid upon pH change.
  • Characterized the concerted yet multi-timescale motions of capsid proteins.
  • Revealed a curved reaction path for the conformational change.

Conclusions:

  • Microsecond time-resolved cryo-EM is a powerful technique for studying fast protein dynamics.
  • The study provides unprecedented insight into CCMV capsid mechanics.
  • This technique opens new avenues for investigating a wide range of previously unobservable protein dynamics, advancing fundamental understanding of protein function.