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Poxvirus multiprotein entry-fusion complex.

Tatiana G Senkevich1, Suany Ojeda, Alan Townsley

  • 1Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-0445, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 13, 2005
PubMed
Summary
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Researchers discovered a stable complex of eight vaccinia virus membrane proteins essential for cell entry and fusion. These proteins, crucial for poxvirus infection, are conserved across species, indicating an ancient entry mechanism.

Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • Poxviruses utilize complex mechanisms for cell entry, assembly, and exocytosis.
  • Four vaccinia virus membrane proteins (A21, A28, H2, L5) are known to be vital for cell entry and fusion, but not for virion assembly or attachment.

Purpose of the Study:

  • To identify and characterize the full protein complex involved in vaccinia virus cell entry and fusion.
  • To investigate the structural and functional relationships of these membrane proteins.

Main Methods:

  • Immunoaffinity purification coupled with mass spectrometry to identify proteins in the complex.
  • Analysis of conditional-lethal null mutants to study complex assembly and stability.
  • Examination of purified virions to assess protein trafficking.

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Main Results:

  • A stable complex of eight vaccinia virus membrane proteins, including four previously uncharacterized ones (A16, G3, G9, J5), was identified.
  • The eight proteins form two distinct groups based on transmembrane domain location and disulfide bond patterns.
  • Complex assembly is dependent on the viral membrane, and individual protein absence destabilizes the complex, yet proteins can traffic independently to the viral membrane.

Conclusions:

  • The eight identified proteins constitute the vaccinia virus entry-fusion complex.
  • These proteins are conserved across all poxviruses, suggesting fundamental, non-redundant roles in an ancient entry mechanism.
  • The findings provide insights into the intricate molecular machinery governing poxvirus infection.