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Structural components of human cytomegalovirus: in situ localization of the major glycoprotein

M P Landini1, B Severi, L Badiali

  • 1Institute of Microbiology, University of Bologna, Italy.

Intervirology
|January 1, 1987
PubMed

Insights

This study investigated human cytomegalovirus glycoprotein localization. The glycoprotein is found on extracellular viral particles and on cell membranes during virus budding.

Area of Science:

  • Virology
  • Cell Biology
  • Immunology

Background:

  • Human cytomegalovirus (HCMV) is a significant human pathogen.
  • Understanding HCMV glycoprotein localization is crucial for viral pathogenesis and therapeutic strategies.
  • Previous studies have limited information on the precise localization of HCMV glycoproteins.

Purpose of the Study:

  • To determine the precise localization of the major cytomegalovirus glycoprotein.
  • To investigate its presence in viral particles and infected cell membranes.
  • To utilize a specific anti-glycoprotein hyperimmune serum for accurate detection.

Main Methods:

  • Indirect immunofluorescence microscopy was employed to detect glycoprotein presence in infected cells.
  • Immunoelectron microscopy was used for high-resolution localization studies.
  • A guinea pig anti-glycoprotein hyperimmune serum (Gonczol et al., 1986) was utilized.

Main Results:

  • Indirect immunofluorescence showed weak, uneven positivity on the plasma membrane of unfixed cells from 72 hours postinfection.
  • Immunoelectron microscopy revealed plasma membrane positivity specifically at sites of viral budding and dense body formation.
  • Extracellular viral particles and dense bodies exhibited strong labeling on their external surfaces.

Conclusions:

  • The major HCMV glycoprotein is primarily associated with extracellular viral particles.
  • Its presence on the host cell membrane is transient and localized to budding sites.
  • These findings contribute to understanding HCMV assembly and cell egress mechanisms.

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