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[The envelope formation of AcMNPV and the location of envelope protein gp64 in host cell]

X Wang1, J Chen, W Gao

  • 1College of Life Sciences, Peking University, Beijing 100871.

Wei Sheng Wu Xue Bao = Acta Microbiologica Sinica
|January 29, 2003
PubMed

Insights

Autographa californica multiple nucleopolyhedrovirus (AcMNPV) utilizes distinct envelope formation pathways in Sf9 cells. The presence of envelope protein gp64 varies depending on the virus

Area of Science:

  • Virology
  • Cell Biology
  • Molecular Biology

Background:

  • Autographa californica multiple nucleopolyhedrovirus (AcMNPV) is a significant baculovirus used in molecular biology and biotechnology.
  • Understanding AcMNPV replication and assembly is crucial for optimizing its use as a gene expression vector.
  • The role of viral envelope proteins in AcMNPV morphogenesis and infectivity requires detailed investigation.

Purpose of the Study:

  • To elucidate the mechanisms of AcMNPV envelope formation in Spodoptera frugiperda (Sf9) insect cells.
  • To investigate the localization and role of the envelope fusion protein gp64 during AcMNPV assembly.
  • To determine how different envelope formation pathways influence the composition of AcMNPV virions.

Main Methods:

  • Electron microscopy was employed to visualize AcMNPV virion morphology and envelope formation.
  • Immunofluorescence techniques were utilized to detect the distribution of the envelope protein gp64.
  • AcMNPV-infected Sf9 cells were analyzed to correlate viral structures with protein localization.

Main Results:

  • AcMNPV exhibited at least two distinct envelope formation pathways: budding from the plasma membrane and intracellular envelopment within the nucleus.
  • A potential third pathway involving budding from the nuclear membrane was also observed.
  • The envelope fusion protein gp64 was primarily localized on the plasma and nuclear membranes of infected cells, but absent on enveloped virions within the nucleus.

Conclusions:

  • The differential localization of gp64 leads to variations in envelope protein composition between AcMNPV virions produced via different pathways.
  • This suggests distinct mechanisms for virion maturation and potential implications for viral infectivity.
  • The study provides critical insights into the complex morphogenesis of AcMNPV in insect cell lines.

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