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Related Experiment Videos

HLA-B27 subtypes differentially associated with disease exhibit subtle structural alterations.

Martin Hülsmeyer1, Roman C Hillig, Armin Volz

  • 1Institut für Immungenetik, Universitätsklinikum Charité, Humboldt-Universität zu Berlin, Spandauer Damm 130, 14050 Berlin, Germany.

The Journal of Biological Chemistry
|September 24, 2002
PubMed
Summary

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The human leukocyte antigen B27 (HLA-B27) protein

Area of Science:

  • Immunogenetics
  • Structural Biology
  • Molecular Medicine

Background:

  • The human leukocyte antigen B27 (HLA-B27) is strongly associated with spondyloarthropathies, but the molecular basis remains unclear.
  • HLA-B27 exists in subtypes, such as B*2705 and B*2709, which differ in their association with disease.

Purpose of the Study:

  • To elucidate the structural and molecular differences between HLA-B27 subtypes B*2705 and B*2709.
  • To understand how these differences contribute to the varying disease associations of HLA-B27.

Main Methods:

  • Determined crystal structures of HLA-B27 subtypes B*2705 and B*2709 complexed with a shared nonapeptide.
  • Utilized X-ray crystallography to analyze structural variations and peptide interactions.

Related Experiment Videos

Main Results:

  • A single amino acid difference (Asp116 in B*2705 vs. His116 in B*2709) in the F-pocket significantly alters peptide binding.
  • His116 in B*2709 causes conformational changes, novel salt bridges, and increased F-pocket flexibility compared to Asp116 in B*2705.
  • Differences in water molecule interactions and hydrogen bonding were observed around residue 116.

Conclusions:

  • The structural variations in the F-pocket of HLA-B27 subtypes influence peptide conformation and interactions.
  • These subtle structural alterations likely underlie the distinct immunobiological properties and disease associations of HLA-B27 subtypes.