Potent functional uncoupling between STIM1 and Orai1 by dimeric 2-aminodiphenyl borinate analogs.

Potent functional uncoupling between STIM1 and Orai1 by dimeric 2-aminodiphenyl borinate analogs.
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DOI:
10.1016/j.ceca.2014.10.005
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发表时间:
2014-12
期刊:
影响因子:
4
通讯作者:
Gill DL
Gill DL
中科院分区:
生物学2区
文献类型:
--
作者:
Hendron E;Wang X;Zhou Y;Cai X;Goto J;Mikoshiba K;Baba Y;Kurosaki T;Wang Y;Gill DL

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ER Ca 2+敏感STIM蛋白和PM奥赖Ca 2+进入通道的偶联产生在控制许多细胞类型中的反应中至关重要的“储存操作的”Ca 2+信号。2-氨基乙氧基二苯基硼酸酯(2-APB)的二聚衍生物DPB 162-AE阻断STIM 1和Orai 1之间的功能偶联,IC 50(200 nM)比2-APB低100倍。与2-APB不同,DPB 162-AE在最大STIM 1-Orai 1阻断水平下不影响L型或TRPC通道或Ca 2+泵。DPB 162-AE阻断STIM 1诱导的Orai 1或Orai 2,但不阻断Orai 3或STIM 2介导的效应。我们将DPB 162-AE的作用位点缩小到STIM 1的STIM-Orai激活区(SOAR)。DPB 162-AE不能阻止SOAR-Orai 1相互作用,但能有效阻断SOAR介导的Orai 1通道激活,但其作用不是作为Orai 1通道孔阻断剂。使用SOAR-F394 H突变体,它阻止了与Orai 1的物理和功能偶联,我们揭示了DPB 162-AE快速恢复SOAR-Orai结合,但仅缓慢恢复Orai 1通道介导的Ca 2+内流。对于相同的SOAR突变体,2-APB诱导与Orai 1的快速物理和功能偶联,但通道激活是短暂的。我们推断2-APB和DPB 162-AE的作用都指向STIM 1-Orai 1偶联界面。与2-APB相比,DPB 162-AE是更有效和特异性更高的STIM 1/Orai 1功能解偶联剂。DPB 162-AE为研究STIM 1和Orai 1通道的功能和耦合提供了重要的药理学工具和有用的机制探针。
The coupling of ER Ca2+-sensing STIM proteins and PM Orai Ca2+ entry channels generates “storeoperated” Ca2+ signals crucial in controlling responses in many cell types. The dimeric derivative of 2-aminoethoxydiphenyl borinate (2-APB), DPB162-AE, blocks functional coupling between STIM1 and Orai1 with an IC50 (200 nM) 100-fold lower than 2-APB. Unlike 2-APB, DPB162-AE does not affect L-type or TRPC channels or Ca2+ pumps at maximal STIM1-Orai1 blocking levels. DPB162-AE blocks STIM1-induced Orai1 or Orai2, but does not block Orai3 or STIM2-mediated effects. We narrowed the DPB162-AE site of action to the STIM-Orai activating region (SOAR) of STIM1. DPB162-AE does not prevent the SOAR-Orai1 interaction but potently blocks SOAR-mediated Orai1 channel activation, yet its action is not as an Orai1 channel pore blocker. Using the SOAR-F394H mutant which prevents both physical and functional coupling to Orai1, we reveal DPB162-AE rapidly restores SOAR-Orai binding but only slowly restores Orai1 channel-mediated Ca2+ entry. With the same SOAR mutant, 2-APB induces rapid physical and functional coupling to Orai1, but channel activation is transient. We infer that the actions of both 2-APB and DPB162-AE are directed toward the STIM1-Orai1 coupling interface. Compared to 2-APB, DPB162-AE is a much more potent and specific STIM1/Orai1 functional uncoupler. DPB162-AE provides an important pharmacological tool and a useful mechanistic probe for the function and coupling between STIM1 and Orai1 channels.
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