A Photo-Crosslinkable Biotin Derivative of the Phosphoantigen (<i>E</i>)-4-Hydroxy-3-Methylbut-2-Enyl Diphosphate (HMBPP) Activates Vγ9Vδ2 T Cells and Binds to the HMBPP Site of BTN3A1
作者:Andrea Mattarei、Monika Enzinger、Siyi Gu、Mohindar Murugesh Karunakaran、Brigitte Kimmel、Nicole Berner、Erin J. Adams、Thomas Herrmann、Sabine Amslinger
DOI:10.1002/chem.201702650
日期:2017.9.4
Vγ9Vδ2 T cells play an important role in the cross talk of the innate and adaptive immune system. For their activation by phosphoantigens (PAgs), both cell surface receptors, the eponymous Vγ9Vδ2 T cell antigen receptors (Vγ9Vδ2 TCRs) on Vγ9Vδ2 T cells and butyrophilin 3A1 (BTN3A1) on the phosphoantigen‐“presenting” cell, are mandatory. To find yet undetected but further contributing proteins, a biotinylated
Vγ9Vδ2T细胞在先天性和适应性免疫系统的串扰中起重要作用。为了通过磷抗原(PAg)激活它们,两个细胞表面受体,在Vγ9Vδ2T细胞上的同名Vγ9Vδ2T细胞抗原受体(Vγ9Vδ2TCR)和在磷酸抗原“呈递”细胞上的butyrophilin 3A1(BTN3A1)都是必不可少的。为了发现尚未发现但又有进一步贡献的蛋白质,采用已知步骤从已知的烯丙醇中分九步合成了生物素化的,可光交联的二苯甲酮探针BioBP-HMBPP(2),总产率为16%。2是基于皮摩尔PAg(E)-4-羟基-3-甲基丁-2-烯基二磷酸酯(HMBPP,1)。激光照射2在308 nm处引发了与蛋白质的光致交联反应。当BTN3A1的B30.2结构域(包含一个带正电荷的PAg结合袋)暴露于增加量的HMBPP(1)时,BioBP-HMBPP(2)的标记显着减少。因为没有破坏BSA标记,所以2显然与天然配体1结合在同一位点。因此,B