STIM1 gates TRPC channels, but not Orai1, by electrostatic interaction.

STIM1 gates TRPC channels, but not Orai1, by electrostatic interaction.
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DOI:
10.1016/j.molcel.2008.09.020
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发表时间:
2008-11-07
期刊:
影响因子:
16
通讯作者:
Muallem, Shmuel
Muallem, Shmuel
中科院分区:
生物学1区
文献类型:
--
作者:
Zeng, Weizhong;Yuan, Joseph P.;Kim, Min Seuk;Choi, Young Jin;Huang, Guo N.;Worley, Paul F.;Muallem, Shmuel

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受体诱发的 Ca2+ 信号包括钙池操纵通道 (SOC) TRPC 和 Orai 通道的激活。尽管两者均由 STIM1 门控,但尚不清楚 STIM1 如何门控通道以及 STIM1 是否通过相同的机制门控 TRPC 和 Orais。在这里,我们报告了 STIM1 门控 TRPC1 的分子机制,该机制涉及 TRPC1(639DD640)中两个保守的带负电的天冬氨酸与 STIM1 多碱基结构域中带正电的 STIM1(684KK685)之间的相互作用。电荷交换和功能分析表明,TRPC1和STIM1上的电荷的精确方向是必需的,但是TRPC1和STIM1上的所有正负电荷组合,除了STIM1(684EE685)+TRPC1(639RR640),只要它们是互易的,都是有功能的,这表明STIM1通过分子间静电相互作用来门控TRPC1。 TRPC3(697DD698) 也观察到类似的门控。 STIM1 通过不同的机制控制 Orai1,因为 STIM1 激活 Orai1 不需要 STIM1 的多碱基和 S/P 结构域。
The receptor-evoked Ca2+ signal includes activation of the store-operated channels (SOCs) TRPC and Orai channels. Although both are gated by STIM1, it is not known how STIM1 gates the channels and whether STIM1 gates the TRPCs and Orais by the same mechanism. Here, we report the molecular mechanism by which STIM1 gates TRPC1, which involves interaction between two conserved, negatively charged aspartates in TRPC1(639DD640) with the positively charged STIM1(684KK685) in STIM1 polybasic domain. Charge swapping and functional analysis revealed that exact orientation of the charges on TRPC1 and STIM1 are required, but all positive-negative charge combinations on TRPC1 and STIM1, except STIM1(684EE685)+TRPC1(639RR640), are functional as long as they are reciprocal, indicating that STIM1 gates TRPC1 by intermolecular electrostatic interaction. Similar gating was observe with TRPC3(697DD698). STIM1 gates Orai1 by a different mechanism since the polybasic and S/P domains of STIM1 are not required for activation of Orai1 by STIM1.
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