Estimation of maximal affinities between T-cell receptors and MHC/peptide complexes.
Recognition of peptide/MHC complexes by T-cell receptors (TCRs) is a critical step for T-cell activation. We studied T-cell activation as a function of this interaction using a mathematical model. Unlike other models analysing TCR-MHC/peptide interactions, this study takes into account that both TCR...
| Autors principals: | , |
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| Format: | Journal article |
| Idioma: | English |
| Publicat: |
1998
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| Sumari: | Recognition of peptide/MHC complexes by T-cell receptors (TCRs) is a critical step for T-cell activation. We studied T-cell activation as a function of this interaction using a mathematical model. Unlike other models analysing TCR-MHC/peptide interactions, this study takes into account that both TCRs and MHC/peptide complexes are anchored in membranes and not in solution. The proposed model quantitatively predicts several essential features of antigen-specific T-cell activation, including the experimentally determined rate of TCR-downregulation during peptide-specific T-cell stimulation. In addition, the model offers an explanation as to why the affinity of the TCR for MHC/peptide complexes is low in general and it correctly predicts the on-rates of the TCR-MHC/peptide interaction observed in different model systems. Thus, the proposed model predicts key parameters of T-cell activation and offers an explanation for the surprisingly low affinity of the TCR for its antigen. |
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