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Natural ligand of mouse CD1d1: cellular glycosylphosphatidylinositol

S Joyce1, A S Woods, J W Yewdell

  • 1Department of Microbiology and Immunology, The Pennsylvania State University College of Medicine, Milton S. Hershey Medical Center, Hershey, PA 17033-0850, USA. sjoyce@bcmic.hmc.psu.edu

Science (New York, N.Y.)
|March 21, 1998
PubMed

Insights

Researchers identified glycosylphosphatidylinositol as a natural ligand for mouse CD1d1 molecules. This finding is crucial for understanding the regulation of immune responses by NK1+ natural T cells.

Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • Mouse CD1d1 is a major histocompatibility antigen-like molecule involved in immune regulation.
  • It interacts with a subset of T lymphocytes known as NK1+ natural T cells.
  • The CD1d1 crystal structure shows a binding site for an unidentified ligand.

Purpose of the Study:

  • To identify the natural ligand bound by mouse CD1d1.
  • To understand the molecular basis of CD1d1-mediated immune regulation.

Main Methods:

  • X-ray crystallography to determine CD1d1 structure.
  • Mass spectrometry to analyze CD1d1-bound molecules.
  • Metabolic radiolabeling to track ligand incorporation.

Main Results:

  • Glycosylphosphatidylinositol (GPI) was identified as a major natural ligand for CD1d1.
  • CD1d1 demonstrated high-affinity binding to the phosphatidylinositol moiety of GPI.
  • This suggests GPI or related glycolipids are ligands for CD1d1-restricted T cells.

Conclusions:

  • Glycosylphosphatidylinositol is a key natural ligand for mouse CD1d1.
  • This discovery advances our understanding of CD1d1 function in T cell immunity.
  • Potential therapeutic strategies targeting CD1d1-GPI interactions can be explored.

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