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Related Experiment Videos

Virus subversion of the MHC class I peptide-loading complex.

Lonnie Lybarger1, Xiaoli Wang, Michael R Harris

  • 1Department of Genetics, Washington University School of Medicine, St. Louis, MO 63110, USA.

Immunity
|January 18, 2003
PubMed
Summary

The mK3 protein of gamma(2)-Herpesvirus 68 hijacks cellular machinery to degrade MHC class I molecules. This viral protein specifically targets MHC class I by interacting with TAP and tapasin for destruction.

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Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Viral proteins often manipulate host cell functions, including the expression of Major Histocompatibility Complex (MHC) class I molecules.
  • The precise mechanisms by which viral proteins recognize and target MHC class I molecules for modulation remain incompletely understood.

Purpose of the Study:

  • To elucidate the mechanism by which the gamma(2)-Herpesvirus 68 mK3 protein targets MHC class I molecules.
  • To identify cellular factors involved in the mK3-mediated regulation of MHC class I expression.

Main Methods:

  • Utilizing cells deficient in the Transporter associated with Antigen Processing (TAP) or tapasin.
  • Performing co-immunoprecipitation assays to assess protein interactions.
  • Analyzing the ubiquitination status of MHC class I molecules in the presence of mK3.

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Main Results:

  • mK3 function in regulating MHC class I was dependent on the presence of TAP and tapasin.
  • mK3 directly interacted with TAP and tapasin, independent of MHC class I.
  • mK3 expression led to the ubiquitination of MHC class I molecules associated with TAP/tapasin.
  • MHC class I mutants unable to interact with TAP/tapasin were resistant to mK3-mediated degradation.

Conclusions:

  • The mK3 protein subverts the MHC class I assembly machinery, specifically TAP and tapasin.
  • mK3 exploits the TAP/tapasin complex to specifically target MHC class I molecules for proteasomal degradation.
  • This mechanism highlights a novel viral strategy for immune evasion by disrupting antigen presentation.