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A nonpolymorphic major histocompatibility complex class Ib molecule binds a large array of diverse self-peptides

S Joyce1, P Tabaczewski, R H Angeletti

  • 1Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York 10461-1975.

The Journal of Experimental Medicine
|February 1, 1994
PubMed
Summary

Major histocompatibility complex (MHC) class Ib molecules, like Qa-2, bind diverse intracellular peptides, challenging the view of specialized peptide presentation. These molecules present a broad repertoire of self-peptides, similar to MHC class Ia molecules.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Protein Biochemistry

Background:

  • Major histocompatibility complex (MHC) class Ia molecules are highly polymorphic and present diverse peptides.
  • MHC class Ib molecules are generally considered nonpolymorphic and specialized for unique peptide presentation.

Purpose of the Study:

  • To biochemically analyze the peptide-binding properties of the soluble Qa-2 antigen (H-2SQ7b).
  • To determine if MHC class Ib molecules present a diverse or specialized range of peptides.

Main Methods:

  • Heterodimer analysis of H-2SQ7b heavy and light chains.
  • Peptide sequencing of bound nonameric peptides.
  • Bioinformatic analysis to identify peptide sources.

Main Results:

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  • H-2SQ7b forms heterodimers that bind nonameric peptides in a 1:1:1 ratio.
  • Peptides bound by H-2SQ7b share conserved hydrophobic C-termini and specific anchor residues (P7, P2, P3).
  • Identified peptides originate from intracellular proteins (e.g., cofilin, L19 ribosomal protein), with at least 200 self-peptides binding H-2SQ7b.

Conclusions:

  • MHC class Ib molecules, exemplified by Qa-2, bind a diverse repertoire of peptides, contrary to prior assumptions.
  • Qa-2 molecules present intracellularly synthesized proteins, functioning similarly to MHC class Ia molecules.