5LYG
CRYSTAL STRUCTURE OF INTRACELLULAR B30.2 DOMAIN OF BTN3A1 BOUND TO MALONATE
Summary for 5LYG
Entry DOI | 10.2210/pdb5lyg/pdb |
Descriptor | Butyrophilin subfamily 3 member A1, 1,2-ETHANEDIOL, MALONATE ION, ... (4 entities in total) |
Functional Keywords | b30.2, butyrophilin, signaling protein |
Biological source | Homo sapiens (Human) |
Cellular location | Cell membrane ; Single- pass type I membrane protein : O00481 |
Total number of polymer chains | 1 |
Total formula weight | 21777.70 |
Authors | Mohammed, F.,Baker, A.T.,Salim, M.,Willcox, B.E. (deposition date: 2016-09-28, release date: 2017-09-13, Last modification date: 2024-05-08) |
Primary citation | Salim, M.,Knowles, T.J.,Baker, A.T.,Davey, M.S.,Jeeves, M.,Sridhar, P.,Wilkie, J.,Willcox, C.R.,Kadri, H.,Taher, T.E.,Vantourout, P.,Hayday, A.,Mehellou, Y.,Mohammed, F.,Willcox, B.E. BTN3A1 Discriminates gamma delta T Cell Phosphoantigens from Nonantigenic Small Molecules via a Conformational Sensor in Its B30.2 Domain. ACS Chem. Biol., 12:2631-2643, 2017 Cited by PubMed Abstract: Human Vγ9/Vδ2 T-cells detect tumor cells and microbial infections by recognizing small phosphorylated prenyl metabolites termed phosphoantigens (P-Ag). The type-1 transmembrane protein Butyrophilin 3A1 (BTN3A1) is critical to the P-Ag-mediated activation of Vγ9/Vδ2 T-cells; however, the molecular mechanisms involved in BTN3A1-mediated metabolite sensing are unclear, including how P-Ag's are discriminated from nonantigenic small molecules. Here, we utilized NMR and X-ray crystallography to probe P-Ag sensing by BTN3A1. Whereas the BTN3A1 immunoglobulin variable domain failed to bind P-Ag, the intracellular B30.2 domain bound a range of negatively charged small molecules, including P-Ag, in a positively charged surface pocket. However, NMR chemical shift perturbations indicated BTN3A1 discriminated P-Ag from nonantigenic small molecules by their ability to induce a specific conformational change in the B30.2 domain that propagated from the P-Ag binding site to distal parts of the domain. These results suggest BTN3A1 selectively detects P-Ag intracellularly via a conformational antigenic sensor in its B30.2 domain and have implications for rational design of antigens for Vγ9/Vδ2-based T-cell immunotherapies. PubMed: 28862425DOI: 10.1021/acschembio.7b00694 PDB entries with the same primary citation |
Experimental method | X-RAY DIFFRACTION (1.6 Å) |
Structure validation
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