Biochemical features of the MHC-related protein 1 consistent with an immunological function

J Immunol. 2003 Jun 15;170(12):6090-8. doi: 10.4049/jimmunol.170.12.6090.


MHC-related protein (MR)1 is an MHC class I-related molecule encoded on chromosome 1 that is highly conserved among mammals and is more closely related to classical class I molecules than are other nonclassical class I family members. In this report, we show for the first time that both mouse and human MR1 molecules can associate with the peptide-loading complex and can be detected at low levels at the surface of transfected cells. We also report the production of recombinant human MR1 molecules in insect cells using highly supplemented media and provide evidence that the MR1 H chain can assume a folded conformation and is stoichiometrically associated with beta(2)-microglobulin, similar to class I molecules. Cumulatively, these findings demonstrate that surface expression of MR1 is possible but may be limited by a specific ligand or associated molecule.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Antibodies, Monoclonal / biosynthesis
  • Cell Membrane / chemistry
  • Cell Membrane / genetics
  • Epitopes / immunology
  • H-2 Antigens / genetics
  • HeLa Cells
  • Histocompatibility Antigens Class I / biosynthesis
  • Histocompatibility Antigens Class I / chemistry*
  • Histocompatibility Antigens Class I / genetics
  • Histocompatibility Antigens Class I / immunology*
  • Humans
  • Intracellular Fluid / chemistry
  • L Cells
  • Mice
  • Mice, Inbred BALB C
  • Minor Histocompatibility Antigens
  • Molecular Sequence Data
  • Peptides / genetics
  • Peptides / metabolism
  • Protein Folding
  • Protein Structure, Tertiary / genetics
  • Recombinant Fusion Proteins / chemical synthesis
  • Recombinant Fusion Proteins / immunology
  • Solubility
  • Spodoptera
  • Transfection
  • Tumor Cells, Cultured
  • beta 2-Microglobulin / physiology


  • Antibodies, Monoclonal
  • Epitopes
  • H-2 Antigens
  • Histocompatibility Antigens Class I
  • MR1 protein, human
  • Minor Histocompatibility Antigens
  • Mr1 protein, mouse
  • Peptides
  • Recombinant Fusion Proteins
  • beta 2-Microglobulin