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Related Experiment Videos

Classical and nonclassical class I major histocompatibility complex molecules exhibit subtle conformational

G F Gao1, B E Willcox, J R Wyer

  • 1Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, Cambridge, Massachusetts 02138, USA.

The Journal of Biological Chemistry
|May 16, 2000
PubMed
Summary

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Human leucocyte antigen class I-redirected anti-tumour CD4<sup>+</sup> T cells require a higher T cell receptor binding affinity for optimal activity than CD8<sup>+</sup> T cells.

Clinical and experimental immunology·2016
This summary is machine-generated.

The CD8 co-receptor binds to MHC class I molecules with varying affinities, crucial for T-cell recognition. Subtle changes in the CD8 alpha3 domain explain these differential binding interactions.

Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • CD4 and CD8 are critical co-receptors enhancing T-cell antigen recognition by binding Major Histocompatibility Complex (MHC) molecules.
  • This interaction is vital for the T-cell receptor (TCR) to effectively recognize peptide-MHC complexes.

Purpose of the Study:

  • To investigate the binding affinity of the CD8alphaalpha co-receptor to various class I MHC molecules.
  • To understand how variations in MHC alleles and CD8 structure influence binding interactions.

Main Methods:

  • Surface Plasmon Resonance (SPR) was employed to quantify the binding kinetics between CD8alphaalpha and different MHC class I molecules.
  • Site-directed mutagenesis was used to identify key amino acid residues in CD8 responsible for binding affinity variations.

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Main Results:

  • CD8alphaalpha exhibited moderate affinities (90-220 microm) for classical MHC class I alleles (e.g., HLA-A*0201, -B*3501), distinct from TCR affinities.
  • Significantly lower affinities (>/=1 mm) were observed for certain alleles (HLA-A*6801, -B*4801), correlating with a lack of cell adhesion.
  • Normal binding to nonclassical HLA-G (approx. 150 microm) and weak binding to HLA-E (>/=1 mm) were noted.
  • Amino acid variations within the CD8 alpha3 domain, particularly in the solvent-exposed loop (residues 223-229), were found to explain differential binding.

Conclusions:

  • The affinity of CD8alphaalpha binding to classical MHC class I molecules is generally lower than TCR/peptide-MHC interactions and may be optimized for T-cell function.
  • Conformational flexibility within the CD8 alpha3 domain loop is a key determinant of differential binding to diverse MHC class I molecules, including classical and nonclassical types.