Download MendeleyMolecular glue binding behavior of phosphoantigens to alpaca butyrophilins.
Liu, C., Yi, S., Zhang, M., Chen, C.C., Liu, Y., Zhang, Z., Guo, R.T., Yang, Y.(2025) J Biological Chem 301: 108555-108555
- PubMed: 40294650
- DOI: https://doi.org/10.1016/j.jbc.2025.108555
- Primary Citation of Related Structures:
9LN2, 9LNZ - PubMed Abstract:
Vγ9Vδ2 T cells that respond to phosphoantigen (pAg) function as crucial sentinels of the immune system to eradicate pathogen-infected cells and tumor cells. Alpaca (Vicugna pacos) is the first nonprimate species identified to possess the pAg-reactive Vγ9Vδ2 T cell subset. However, the molecular mechanism accounting for the pAg recognition of alpaca Vγ9Vδ2 T cells remains unclear. Here, we report the crystal structures of alpaca butyrophilin 3 (VpBTN3) B30.2 domain in complex with the exogenous pAg analog, HMBPP-08, which is a valuable tool for studying the mechanism of butyrophilin-dependent Vγ9Vδ2 T cell activation, and the endogenous pAg analogue, dimethylallyl (S)-thiolodiphosphate (DMASPP). We elucidated that the function of pAgs is governed by their structural differences. Notably, DMASPP acts as a molecular glue in the interaction between the intracellular B30.2 domains of heterologous butyrophilins in alpaca and human. Interestingly, although HMBPP-08 has stronger affinity than DMASPP to VpBTN3 B30.2 domain, HMBPP-08 did not promote heterologous VpBTNs interaction. These findings establish a novel theoretical framework elucidating the mechanisms of Vγ9Vδ2 T cell activation and demonstrate the conserved evolutionary mechanisms underlying cross-species immune adaptation.
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, School of Life Sciences, Hubei University, Wuhan, PR China.
Organizational Affiliation:
