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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Reiser, J.B. et al.

A T cell receptor CDR3beta loop undergoes conformational changes of unprecedented magnitude upon binding to a peptide/MHC class I complex.

The elongated complementary-determining region (CDR) 3beta found in the unliganded KB5-C20 TCR protrudes from the antigen binding site and prevents its docking onto the peptide/MHC (pMHC) surface according to a canonical diagonal orientation. We now present the crystal structure of a complex involving the KB5-C20 TCR and an octapeptide bound to the allogeneic H-2K(b) MHC class I molecule. This structure reveals how a tremendously large CDR3beta conformational change allows the KB5-C20 TCR to adapt to the rather constrained pMHC surface and achieve a diagonal docking mode. This extreme case of induced fit also shows that TCR plasticity is primarily restricted to CDR3 loops and does not propagate away from the antigen binding site.[1]

References

A T cell receptor CDR3beta loop undergoes conformational changes of unprecedented magnitude upon binding to a peptide/MHC class I complex. Reiser, J.B., Grégoire, C., Darnault, C., Mosser, T., Guimezanes, A., Schmitt-Verhulst, A.M., Fontecilla-Camps, J.C., Mazza, G., Malissen, B., Housset, D. Immunity (2002) [Pubmed]

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