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Lipid membranes in poxvirus replication

Jason P Laliberte1, Bernard Moss1

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

Viruses
|October 14, 2011
PubMed

Insights

Poxviruses gain multiple membranes during cytoplasmic replication, with their origin and wrapping mechanisms still under investigation. Understanding these processes is key to controlling poxvirus infections.

Area of Science:

  • Virology
  • Cell Biology
  • Molecular Biology

Background:

  • Poxviruses replicate within the host cell cytoplasm.
  • Poxviruses acquire multiple lipoprotein membranes during replication.
  • The origin of the initial poxvirus membrane is not well understood.

Purpose of the Study:

  • To elucidate the origin and acquisition of membranes by poxviruses during replication.
  • To understand the mechanism of membrane wrapping and virion maturation.
  • To investigate the role of cellular membranes in poxvirus assembly.

Main Methods:

  • Analysis of poxvirus replication intermediates.
  • Electron microscopy to visualize virion structure and membrane acquisition.
  • Biochemical assays to characterize viral and cellular membrane components.

Main Results:

  • Poxviruses acquire multiple lipoprotein membranes in the cytoplasm.
  • A proposed de novo origin for the initial membrane lacks substantiation.
  • A subsequent wrapping step involves modified trans-Golgi or endosomal cisternae, forming a three-membraned particle.
  • Virions traverse the cytoplasm on microtubules.
  • Membrane loss occurs during exocytosis and before cell entry.

Conclusions:

  • Poxvirus assembly involves complex membrane acquisition and modification steps within the cytoplasm.
  • The precise origin of the initial viral membrane remains an open question.
  • Understanding poxvirus membrane dynamics is crucial for developing antiviral strategies.
Keywords:
endocytosisexocytosisphospholipidstransmembrane proteinsvirus assemblyvirus entry

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