Solution mapping of T cell receptor docking footprints on peptide-MHC

L Varani, AJ Bankovich, CW Liu… - Proceedings of the …, 2007 - National Acad Sciences
L Varani, AJ Bankovich, CW Liu, LA Colf, LL Jones, DM Kranz, JD Puglisi, KC Garcia
Proceedings of the National Academy of Sciences, 2007National Acad Sciences
T cell receptor (TCR) recognition of peptide-MHC (pMHC) is central to the cellular immune
response. A large database of TCR–pMHC structures is needed to reveal general structural
principles, such as whether the repertoire of TCR/MHC docking modes is dictated by a
“recognition code” between conserved elements of the TCR and MHC genes. Although≈ 17
cocrystal structures of unique TCR–pMHC complexes have been determined,
cocrystallization of soluble TCR and pMHC remains a major technical obstacle in the field …
T cell receptor (TCR) recognition of peptide-MHC (pMHC) is central to the cellular immune response. A large database of TCR–pMHC structures is needed to reveal general structural principles, such as whether the repertoire of TCR/MHC docking modes is dictated by a “recognition code” between conserved elements of the TCR and MHC genes. Although ≈17 cocrystal structures of unique TCR–pMHC complexes have been determined, cocrystallization of soluble TCR and pMHC remains a major technical obstacle in the field. Here we demonstrate a strategy, based on NMR chemical shift mapping, that permits rapid and reliable analysis of the solution footprint made by a TCR when binding onto the pMHC surface. We mapped the 2C TCR binding interaction with its allogeneic ligand H–2Ld–QL9 and identified a group of NMR-shifted residues that delineated a clear surface of the MHC that we defined as the TCR footprint. We subsequently found that the docking footprint described by NMR shifts was highly accurate compared with a recently determined high-resolution crystal structure of the same complex. The same NMR footprint analysis was done on a high-affinity mutant of the TCR. The current work serves as a foundation to explore the molecular dynamics of pMHC complexes and to rapidly determine the footprints of many Ld-specific TCRs.
National Acad Sciences