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Structure and binding kinetics of three different human CD1d-alpha-galactosylceramide-specific T cell receptors

Stephan D Gadola1, Michael Koch, Jon Marles-Wright

  • 1Department of Rheumathology and Clinical Immunology, University of Bern, Inselspital, Berne CH-3010, Switzerland. stephan.gadola@insel.ch

The Journal of Experimental Medicine
|March 8, 2006
PubMed

Insights

Invariant natural killer T (iNKT) cells recognize CD1d-alpha-glycosylceramides. Structural analysis reveals how T cell receptors (TCRs) interact with CD1d-alpha-GalCer, explaining Vbeta chain usage in iNKT cell recognition.

Area of Science:

  • Immunology
  • Structural Biology
  • Biochemistry

Background:

  • Invariant natural killer T (iNKT) cells are crucial immune cells restricted by CD1d-alpha-glycosylceramides.
  • These cells play a significant role in immune responses, making their recognition mechanisms a key area of study.

Purpose of the Study:

  • To analyze the crystal structures and binding characteristics of invariant human T cell receptors (TCRs) with CD1d-alpha-GalCer.
  • To elucidate the molecular interactions governing the recognition of CD1d-alpha-GalCer by Vbeta11+ TCRs.

Main Methods:

  • Crystal structure analysis of iNKT TCRs in complex with CD1d-alpha-GalCer.
  • Computational docking of TCR and CD1d-alpha-GalCer structures to model their interaction.
  • Analysis of TCR complementarity determining regions (CDRs) involved in ligand binding.

Main Results:

  • Structural analysis revealed similarities to MHC-peptide-specific TCRs, highlighting TCR platform versatility.
  • A model suggests a diagonal TCR orientation on CD1d, with specific CDRs interacting with the ligand and CD1d.
  • The findings explain the preferential use of Vbeta11 and Vbeta8.2 chains by human and mouse iNKT cells, respectively.

Conclusions:

  • The study provides structural insights into the interaction between iNKT cell TCRs and CD1d-alpha-GalCer.
  • The proposed model explains the molecular basis for TCR chain usage in iNKT cell recognition of CD1d-alpha-GalCer.
  • This work contributes to understanding the fundamental mechanisms of T cell recognition and immune surveillance.

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