In this study, Uldrich and colleagues describe the crystal structure of the Vγ9Vδ2 T cell antigen receptor (TCR) interacting with BTN2A1 and demonstrate the existence of a second ligand that co-binds to a distinct epitope on Vγ9Vδ2 TCR. Using these data, the authors suggest a model of Vγ9Vδ2 TCR activation in which BTN2A1 and BTN3A1 are tethered to each other at the steady state, and must disengage to allow TCR binding.
- Thomas S. Fulford
- Caroline Soliman
- Adam P. Uldrich