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This study characterizes human CD8αβ interactions with MHC molecules. We found CD8αβ exhibits weak binding affinity to classical MHC class I alleles and interacts with some unconventional molecules, impacting T-cell receptor selection.

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CD8‐co‐receptorKDSurface Plasmon ResonanceT cell antigen recognitionTCRthymic selection

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Area of Science:

  • Immunology
  • Molecular Biology
  • Biophysics

Background:

  • The CD8 co-receptor is crucial for T-cell function, existing as CD8αα homodimers and CD8αβ heterodimers.
  • CD8αβ is the canonical co-receptor on cytotoxic T-cells, regulating T-cell receptor (TCR) selection and peripheral antigen responses.
  • The biophysical properties of human CD8αβ binding to MHC molecules remain largely uncharacterized.

Purpose of the Study:

  • To determine the binding affinities of human CD8αβ and CD8αα to classical MHC class I (MHCI) alleles.
  • To investigate the interactions of CD8αα and CD8αβ with unconventional MHC-like molecules.
  • To explore the relationship between CD8 binding affinity and TCR selection.

Main Methods:

  • Generation of soluble human CD8αβ and CD8αα using hetero-dimerized Fc-fusions.
  • Assessment of binding affinities to various MHCI alleles and MHC-like molecules using biophysical techniques.
  • Analysis of the association between CD8 binding affinity and TCR affinity.

Main Results:

  • Both CD8αβ and CD8αα displayed weak binding affinities to multiple MHCI alleles, with variations observed across different alleles.
  • CD8αα and CD8αβ bound to MHCI-related protein 1 with similar affinities as to classical MHCI.
  • No binding was detected between CD8 and CD1a, CD1b, CD1c, or CD1d molecules.
  • A significant inverse correlation was found between TCR affinity and CD8 co-receptor affinity for different MHCI alleles.

Conclusions:

  • This study provides the first characterization of human CD8αβ binding to MHCI and related molecules.
  • CD8 binding affinity to MHCI alleles is allele-specific and influences TCR selection in the thymus.
  • The findings reveal a novel relationship between CD8-MHCI interactions and the development of the T-cell repertoire.