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Related Experiment Videos

A correlation between TCR Valpha docking on MHC and CD8 dependence: implications for T cell selection.

Jennifer Buslepp1, Huanchen Wang, William E Biddison

  • 1Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, NC 27599, USA.

Immunity
|October 18, 2003
PubMed
Summary

T cell receptors (TCRs) usually bind major histocompatibility complex (MHC) molecules similarly. A new xenoreactive TCR/MHC structure reveals unique TCR Valpha domain positioning, challenging existing models of T cell recognition.

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Area of Science:

  • Immunology
  • Structural Biology
  • Molecular Biology

Background:

  • T cell receptors (TCRs) interact with major histocompatibility complex (MHC) molecules, a critical step in adaptive immunity.
  • The precise mechanism dictating the conserved orientation of TCRs on MHC molecules is not fully understood.
  • Existing TCR/MHC structures provide insights but lack explanation for all observed orientations.

Purpose of the Study:

  • To elucidate the structural basis for TCR orientation during MHC binding.
  • To investigate the role of TCR Valpha domain placement in determining TCR/MHC orientation.
  • To re-evaluate existing TCR/MHC structures in light of new findings and correlate with CD8 dependence.

Main Methods:

  • Cocrystallography of a xenoreactive murine TCR bound to a human MHC molecule.

Related Experiment Videos

  • Structural analysis comparing the novel TCR/MHC complex to existing structures.
  • Re-analysis of existing TCR/MHC cocrystal structures focusing on TCR Valpha domain positioning.

    • Main Results:

    • Determined the cocrystallographic structure of a mouse TCR bound to a human MHC molecule.
    • Observed a unique TCR orientation deviating significantly from typical TCR/MHC interactions.
    • Identified TCR Valpha domain placement on the MHC as the sole determinant of this unique orientation.
    • Discovered correlations between TCR Valpha domain position on MHC class I and CD8 dependence.

    Conclusions:

    • The orientation of TCRs on MHC molecules is influenced by specific domain interactions, particularly the TCR Valpha domain.
    • Unique TCR/MHC orientations can arise from interactions with non-self MHC molecules.
    • TCR Valpha domain positioning on MHC class I molecules may be linked to CD8 co-receptor dependence.
    • The conserved orientation of TCRs during MHC recognition is likely a result of selection pressures during T cell development.