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Related Experiment Videos

MHC class II structure, occupancy and surface expression determined by post-endoplasmic reticulum antigen binding.

R N Germain1, L R Hendrix

  • 1Lymphocyte Biology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892.

Nature
|September 12, 1991
PubMed
Summary

Class II major histocompatibility complex (MHC) molecules change structure when binding peptide antigens. This suggests MHC class II acquires peptides outside the endoplasmic reticulum, influencing cell surface expression.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Class II major histocompatibility complex (MHC) molecules are crucial for adaptive immunity.
  • These molecules present peptide antigens to T helper cells.
  • Structural changes in Class II MHC upon peptide binding are not fully understood.

Purpose of the Study:

  • To investigate the structural alterations in Class II MHC molecules after peptide antigen binding.
  • To determine the location of peptide acquisition by Class II MHC.
  • To assess the saturation of the Class II MHC presentation system with self-peptides.

Main Methods:

  • Analysis of Class II MHC molecules from splenic antigen-presenting cells.
  • Characterization of structural changes upon stable peptide antigen binding.

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Main Results:

  • Class II MHC molecules exhibit structural changes upon stable peptide binding.
  • Peptide acquisition by Class II MHC molecules is preferred outside the endoplasmic reticulum.
  • The Class II MHC presentation system is not saturated with self-peptides.
  • Numerous empty Class II MHC molecules are present on the cell surface.

Conclusions:

  • Peptide antigen binding induces structural changes in Class II MHC molecules.
  • Class II MHC molecules acquire peptides in a compartment distinct from the endoplasmic reticulum.
  • Surface expression of Class II MHC is regulated by peptide antigen availability.