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Continuous flexibility analysis of SARS-CoV-2 spike prefusion structures.

Roberto Melero1, Carlos Oscar S Sorzano1, Brent Foster2

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|October 16, 2020
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Summary

The SARS-CoV-2 spike protein exhibits a continuum of conformational states, not distinct structures. This flexibility impacts the interpretation of cryo-EM data and highlights potential image processing instabilities.

Keywords:
SARS-CoV-2conformational flexibilitycryo-electron microscopyimage processingspike

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Area of Science:

  • Structural biology
  • Virology
  • Biophysics

Background:

  • The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike protein is crucial for viral entry.
  • Understanding its conformational dynamics in the prefusion state is key to developing effective therapeutics.

Purpose of the Study:

  • To analyze the flexibility and conformational dynamics of the SARS-CoV-2 spike protein in its prefusion state.
  • To investigate the nature of spike protein conformations using advanced image processing techniques.

Main Methods:

  • A novel consensus-based image-processing approach was employed.
  • Principal component analysis (PCA) was utilized to analyze conformational variations.
  • Flexible fitting was used to model dynamic changes.

Main Results:

  • Concerted motions were observed involving the receptor-binding domain (RBD) and other subdomains.
  • The study revealed a continuum of spike protein states rather than discrete, stable conformations.
  • An ensemble map demonstrated significant conformational flexibility.

Conclusions:

  • The SARS-CoV-2 spike protein exists as a spectrum of conformations, not fixed states.
  • Image processing classification instability can affect the interpretability of complex cryo-EM datasets.
  • These findings have implications for structural studies and therapeutic target identification.