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. 1993 Mar 1;177(3):869–873. doi: 10.1084/jem.177.3.869

Changes at peptide residues buried in the major histocompatibility complex (MHC) class I binding cleft influence T cell recognition: a possible role for indirect conformational alterations in the MHC class I or bound peptide in determining T cell recognition

PMCID: PMC2190936  PMID: 8436915

Abstract

Recent crystallographic studies on two peptide complexes with the mouse Kb molecule have shown that peptide binding appears to alter the conformation of the class I alpha-helical regions that flank the antigen binding cleft. Given that this study also showed that much of the foreign peptide is buried within the class I binding cleft with only a small portion accessible for direct interaction with the components of the T cell receptor, this finding suggests that at least some component of T cell specificity may arise as a consequence of peptide-induced conformational changes in the class I structure. To assess this possibility, we have made systematic substitutions at residues within the Kb-restricted determinant from ovalbumin (OVA257- 264) that are thought to be buried on binding to the class I molecule. We have found that changes in this determinant at the completely buried second residue (P2) can influence T cell recognition without affecting binding to Kb, suggesting that the substitutions may indirectly determine T cell recognition by altering the conformation of the class I molecule or the bound peptide.

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Selected References

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