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-Structure paper
| タイトル | Structures of butyrophilin multimers reveal a plier-like mechanism for Vγ9Vδ2 T cell receptor activation. |
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| ジャーナル・号・ページ | Immunity, Vol. 58, Issue 7, Page 1660-11669.e7, Year 2025 |
| 掲載日 | 2025年7月8日 |
著者 | Mai Zhang / Yiqing Wang / Ningning Cai / Yingying Qu / Xianqiang Ma / Jing Xue / Xiaorui Chen / Xueguang Zhang / Junyu Xiao / Yonghui Zhang / ![]() |
| PubMed 要旨 | Vγ9Vδ2 T cells, the major circulating human γδ T cell subset, respond to infections and tumors by recognizing phosphoantigens (pAgs) via transmembrane butyrophilins (BTN3A1, BTN3A2, and BTN2A1). ...Vγ9Vδ2 T cells, the major circulating human γδ T cell subset, respond to infections and tumors by recognizing phosphoantigens (pAgs) via transmembrane butyrophilins (BTN3A1, BTN3A2, and BTN2A1). Here, using cryoelectron microscopy, we resolved the structures of BTN multimers bound to the microbial pAg HMBPP alone and in complex with the T cell receptor (TCR). These structures reveal that BTN3A1 and BTN2A1 cooperate to sense pAgs through their intracellular B30.2 domains, whereas BTN3A2 and BTN2A1 interact extracellularly. TCR engagement triggers its conformational changes, allowing BTN2A1 to bind the Vγ9 chain laterally and BTN3A2 to interact apically with the Vδ2 chain's germline-encoded regions and CDR3 motif, as well as the Vγ9 CDR3. Our study uncovers a "plier-like gripping" mechanism, where BTN multimers bridge the TCR surface to drive activation. These findings establish a structural foundation for γδ T cell-targeted immunotherapies distinct from αβ T cell strategies reliant on major-histocompatibility-complex-mediated antigen presentation. |
リンク | Immunity / PubMed:40505658 |
| 手法 | EM (単粒子) |
| 解像度 | 3.0 - 4.51 Å |
| 構造データ | EMDB-61724, PDB-9jq6: EMDB-61732, PDB-9jqp: ![]() EMDB-61733: Extracellular region of the HMBPP-primed BTN3A1-BTN3A2-BTN2A1 complex (EMReady) ![]() EMDB-61734: TM/JM/B30.2 regions of the HMBPP-primed BTN3A1-BTN3A2-BTN2A1 complex (EMReady) ![]() EMDB-61735: Raw consensus map of the HMBPP-primed BTN3A1-BTN3A2-BTN2A1 complex EMDB-61736, PDB-9jqq: ![]() EMDB-61737: Extracellular region of the Vgamma9Vdelta2 TCR-engaged BTN3A1-BTN3A2-BTN2A1 complex (EMReady) ![]() EMDB-61738: TM/JM/B30.2 regions of the Vgamma9Vdelta2 TCR-engaged BTN3A1-BTN3A2-BTN2A1 complex (EMReady) ![]() EMDB-61739: Raw consensus map of the Vgamma9Vdelta2 TCR-engaged BTN3A1-BTN3A2-BTN2A1 complex EMDB-61740, PDB-9jqr: |
| 化合物 | ![]() ChemComp-NAG: ![]() ChemComp-H6P: |
| 由来 |
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キーワード | IMMUNE SYSTEM / receptor / butyrophilin / antagonist / antibody / agonist / phosphoantigen |
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