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H-2Kd-restricted antigenic peptides share a simple binding motif.
P Romero1, G Corradin, I F Luescher
1Ludwig Institute for Cancer Research, Lausanne Branch, Epalinges, Switzerland.
The Journal of Experimental Medicine
|September 1, 1991
Summary
Researchers identified a specific binding motif for four T cell epitopes on the H-2Kd major histocompatibility complex (MHC) class I molecule. This motif, featuring tyrosine and a hydrophobic residue, aids in predicting new T cell epitopes for this MHC molecule.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Major histocompatibility complex (MHC) class I molecules present peptides to T cells, crucial for immune responses.
- H-2Kd is an MHC class I allele with specific peptide-binding requirements.
- Understanding peptide-MHC interactions is key to deciphering T cell recognition.
Purpose of the Study:
- To define structural features critical for the binding of diverse antigenic epitopes to the H-2Kd molecule.
- To identify a predictive motif for H-2Kd-restricted T cell epitopes.
Main Methods:
- Analysis of synthetic peptide truncation and substitution mutants.
- Functional competition assays to assess relative peptide potency.
- Photoaffinity labeling for direct binding assays.
Main Results:
- Optimal binding and antigenic activity for four epitopes were observed in peptides of 9-10 amino acids.
- Shorter peptides exhibited higher affinity for the H-2Kd molecule.
- A conserved binding motif was identified: Tyr at position 2 and a hydrophobic residue at the C-terminus of optimal peptides.
Conclusions:
- A simple two-element motif (Tyr and a hydrophobic residue) governs H-2Kd peptide binding.
- This motif is present in known H-2Kd-restricted epitopes and can predict new ones.
- The findings facilitate the prediction of T cell epitopes for H-2Kd-restricted immune responses.