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Related Experiment Videos

Viral interference with antibody and complement

J Lubinski1, T Nagashunmugam, H M Friedman

  • 1Department of Medicine, University of Pennsylvania School of Medicine, 536 Johnson Pavilion, Philadelphia, PA, 19104-6073, USA.

Seminars in Cell & Developmental Biology
|July 17, 1998
PubMed
Summary

Viruses like herpesviruses use proteins to block antibody and complement immune responses. Herpes simplex virus type 1 glycoproteins gE, gI, and gC help the virus evade immune detection.

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Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • Viruses have developed mechanisms to evade host immune responses, particularly those involving antibodies and complement.
  • Herpesviruses, coronaviruses, vaccinia virus, and HIV-1 encode proteins that interfere with immune functions.
  • These viral proteins can inhibit antibody activity or complement pathways, aiding viral survival.

Purpose of the Study:

  • To describe the structure and biological activities of herpes simplex virus type 1 (HSV-1) glycoproteins gE, gI, and gC.
  • To elucidate how these glycoproteins contribute to HSV-1 immune evasion.

Main Methods:

  • Structural and functional analysis of HSV-1 glycoproteins gE, gI, and gC.
  • Investigation of the interactions between viral glycoproteins and host immune components (IgG Fc, C3b).

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Main Results:

  • HSV-1 glycoproteins gE and gI form a complex that binds to the Fc domain of immunoglobulin G (IgG).
  • HSV-1 glycoprotein gC functions as a complement regulatory protein by binding to C3b.
  • These interactions inhibit antibody-mediated and complement-mediated immune functions.

Conclusions:

  • HSV-1 glycoproteins gE, gI, and gC play crucial roles in protecting the virus from immune attack.
  • The ability to bind IgG Fc and C3b provides HSV-1 with a survival advantage both in vitro and in vivo.
  • Understanding these viral evasion strategies is key to developing effective antiviral therapies.