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Structural basis for a major histocompatibility complex class Ib-restricted T cell response.

Hilary L Hoare1, Lucy C Sullivan, Gabriella Pietra

  • 1The Protein Crystallography Unit, Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, Victoria 3800, Australia.

Nature Immunology
|February 14, 2006
PubMed
Summary

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This summary is machine-generated.

Major histocompatibility complex (MHC) class Ib molecule HLA-E can mediate adaptive immunity against human cytomegalovirus. This MHC-E molecule shows fine specificity for viral peptides, distinguishing self from non-self.

Area of Science:

  • Immunology
  • Structural Biology
  • Virology

Background:

  • Major histocompatibility complex (MHC) class Ia molecules orchestrate antigen-specific adaptive immunity.
  • Ancestrally related nonclassical MHC class Ib molecules typically mediate innate immune responses.

Purpose of the Study:

  • To elucidate the structural basis for HLA-E mediating adaptive cytotoxic T lymphocyte (CTL) responses to human cytomegalovirus (CMV).
  • To investigate the specificity and evolutionary implications of HLA-E's role in adaptive immunity.

Main Methods:

  • Structural analysis of the T cell receptor (TCR)-MHC class Ib complex.
  • Investigation of peptide binding specificity of HLA-E.

Main Results:

  • Demonstrated the structural basis by which HLA-E mediates an adaptive MHC-restricted CTL response to human cytomegalovirus.

Related Experiment Videos

  • The response exhibited fine specificity for position 8 of the viral peptide, crucial for self/non-self discrimination.
  • The structure of the TCR-MHC class Ib complex closely resembled conventional TCR-MHC class Ia complexes.

    • Conclusions:

    • HLA-E possesses the functional capacity to mediate virus-specific CTL responses within adaptive immunity.
    • HLA-E's 'ambiguity' allows interaction with both innate immune receptors and adaptive immune effectors.
    • Highlights the dual role of MHC class Ib molecules in immune responses.