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
中科院分区:
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
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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DOI:
10.1126/science.1228757
发表时间:
2012-12-07
期刊:
Science (New York, N.Y.)
影响因子:
--
作者:
Hou X;Pedi L;Diver MM;Long SB
通讯作者:
Long SB
影响因子:
9.2
作者:
Kar, Pulak;Nelson, Charmaine;Parekh, Anant B.
通讯作者:
Parekh, Anant B.
影响因子:
4.8
作者:
Hewavitharana, Thamara;Deng, Xiaoxiang;Gill, Donald L.
通讯作者:
Gill, Donald L.
影响因子:
4.8
作者:
He, LP;Hewavitharana, T;Gill, DL
通讯作者:
Gill, DL
影响因子:
44.1
作者:
Li, Zhengzheng;Liu, Lin;Xu, Tao
通讯作者:
Xu, Tao