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Native hepatitis B virions and capsids visualized by electron cryomicroscopy.

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Hepatitis B virus (HBV) virions and capsids share icosahedral symmetry. Surface glycoproteins on HBV virions exhibit an ordered, non-icosahedral lattice, distinguishing them from other enveloped viruses.

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Area of Science:

  • Virology
  • Structural Biology
  • Biophysics

Background:

  • Hepatitis B virus (HBV) infection impacts over 350 million people globally, causing significant mortality.
  • The structure of in vitro assembled HBV capsids is well-studied, but native capsids and mature virions remain less understood.
  • Understanding the structure of native HBV capsids and virions is crucial for developing effective antiviral strategies.

Purpose of the Study:

  • To investigate the structure and assembly of native Hepatitis B virus (HBV) capsids and virions.
  • To compare the structure of HBV virions from patient serum with capsids from infected mouse livers.
  • To elucidate the arrangement of surface glycoproteins on the HBV envelope.

Main Methods:

  • Electron cryomicroscopy (cryo-EM) was employed to visualize HBV virions and capsids.
  • Image analysis techniques were used to reconstruct the three-dimensional structures.
  • HBV virions were isolated from patient serum, and capsids were obtained from transgenic mouse livers.

Main Results:

  • Both HBV virions and capsids exhibited icosahedral symmetry, consistent with previous in vitro studies.
  • Capsids displayed either T = 3 or T = 4 icosahedral symmetry.
  • Surface glycoproteins on the virion envelope formed an ordered lattice with non-icosahedral packing, differentiating HBV from other enveloped viruses.

Conclusions:

  • Native Hepatitis B virus (HBV) capsids and virions possess icosahedral structures.
  • The unique, ordered lattice of surface glycoproteins on HBV virions is a distinguishing feature.
  • These structural findings provide new insights into HBV assembly and potential therapeutic targets.