A conserved energetic footprint underpins recognition of Human Leukocyte Antigen-E by two distinct αβ T cell receptors Academic Article uri icon

abstract

  • αβ T cell receptors (TCRs) interact with peptides bound to the polymorphic major histocompatibility complex class Ia (MHC-Ia) and class II (MHC-II) molecules as well as the essentially monomorphic MHC class Ib (MHC-Ib) molecules. Although there is a large amount of information on how TCRs engage with MHC-Ia and MHC-II, our understanding of TCR/MHC-Ib interactions is very limited. Infection with cytomegalovirus (CMV) can elicit a CD8+ T cell response restricted by the human MHC-Ib molecule human leukocyte antigen (HLA)-E and specific for an epitope from UL40 (VMAPRTLIL), which is characterized by biased TRBV14 gene usage. Here we describe an HLA-E-restricted CD8+ T cell able to recognize an allotypic variant of the UL40 peptide with a modification at position 8 (P8) of the peptide (VMAPRTLVL) that uses the TRBV9 gene segment. We report the structures of a TRBV9+ TCR in complex with the HLA-E molecule presenting the two peptides. Our data revealed that the TRBV9+ TCR adopts a different docking mode and molecular footprint atop HLA-E when compared with the TRBV14+ TCR-HLA-E ternary complex. Additionally, despite their differing V gene segment usage and different docking mechanisms, mutational analyses showed that the TCRs shared a conserved energetic footprint on the HLA-E molecule, focused around the peptide-binding groove. Hence, we provide new insights into how monomorphic MHC molecules interact with T cells.

authors

  • Sullivan, Lucy C
  • Walpole, Nicholas G
  • Farenc, Carine
  • Pietra, Gabriella
  • Sum, Matthew J Wenhwa
  • Clements, Craig S
  • Lee, Eleanor J
  • Beddoe, Travis
  • Falco, Michela
  • Mingari, Maria Cristina
  • Moretta, Lorenzo
  • Gras, Stephanie
  • Rossjohn, Jamie
  • Brooks, Andrew G

publication date

  • 2017

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