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Related Experiment Videos

Virus structure analysis with synchrotron radiation: methods and results.

John E Johnson1

  • 1Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA. jackj@scripps.edu

Journal of Synchrotron Radiation
|December 4, 2003
PubMed
Summary

Viral subunits self-assemble into icosahedral particles, undergoing pH-dependent structural changes and auto-catalytic modifications. These studies reveal insights into viral molecular machines and their assembly dynamics.

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Area of Science:

  • Structural biology
  • Virology
  • Biochemistry

Background:

  • Viruses are complex molecular machines requiring detailed structural understanding.
  • Investigating viral assembly and maturation provides insights into fundamental biological processes.

Purpose of the Study:

  • To elucidate the structure, assembly, and maturation processes of RNA and double-stranded DNA (dsDNA) viruses.
  • To understand the driving forces and trajectories of large-scale structural transitions in viral particles.

Main Methods:

  • Crystallography
  • Solution X-ray scattering
  • Electron microscopy
  • Molecular virology
  • Cryo-electron microscopy (cryoEM) reconstructions

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Main Results:

  • RNA viral subunits (240 copies) form T=4 icosahedral particles (450 A) that condense and cleave at pH 5.
  • dsDNA viral subunits (420 copies) form T=7 icosahedral particles (450 A) that expand and cross-link at pH 4, becoming protease-resistant.
  • Moderate- to high-resolution structures of procapsids and capsids were determined.

Conclusions:

  • Viral particle assembly and maturation involve pH-sensitive conformational changes and auto-catalytic modifications.
  • These structural transitions are crucial for viral stability and function.
  • The study defines the mechanisms underlying viral particle formation and stability.