Activation of Slo1 BK channels by Mg2+ coordinated between the voltage sensor and RCK1 domains.

Activation of Slo1 BK channels by Mg2+ coordinated between the voltage sensor and RCK1 domains.
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DOI:
10.1038/nsmb.1507
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发表时间:
2008-11
影响因子:
16.8
通讯作者:
Cui, Jianmin
Cui, Jianmin
中科院分区:
生物学1区
文献类型:
--
作者:
Yang, Huanghe;Shi, Jingyi;Zhang, Guohui;Yang, Junqiu;Delaloye, Kelli;Cui, Jianmin

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BK通道的电压传感器域(VSD)和配体传感器域(细胞质域)协同控制通道活动,从而整合电信号和化学信号以实现细胞功能。研究表明,细胞内Mg2+介导这些感觉域之间的相互作用,通过与VSD的静电相互作用激活通道。在这里,我们报道Mg2+结合到一个由VSD (Asp99和Asn172)和细胞质域(Glu374和Glu399)的氨基酸侧链组成的位点上。对于每个Mg2+结合位点,VSD和细胞质区域的残基来自邻近的亚基。这些结果表明,VSD和来自不同亚基的细胞质结构域可能在通道门控过程中相互作用,并且VSD或RCK1结构域对BK通道孔的填充与Kv1.2或MthK通道的填充不同。
The voltage sensor domain (VSD) and the ligand sensor (cytoplasmic domain) of BK channels synergistically control channel activities, thereby integrating electrical and chemical signals for cell function. Studies show that intracellular Mg2+ mediates the interaction between these sensory domains to activate the channel through an electrostatic interaction with the VSD. Here we report that Mg2+ binds to a site that consists of amino acid side-chains from both the VSD (Asp99 and Asn172) and the cytoplasmic domain (Glu374 and Glu399). For each Mg2+ binding site the residues in the VSD and those in the cytoplasmic domain come from neighboring subunits. These results suggest that the VSD and the cytoplasmic domains from different subunits may interact during channel gating, and the packing of VSD or the RCK1 domain to the pore in BK channels differ from that in Kv1.2 or MthK channels.
DOI: 10.1085/jgp.200509419
发表时间: 2006-06
期刊: The Journal of general physiology
影响因子: --
作者:
Fodor AA;Aldrich RW
通讯作者: Aldrich RW
MG2+增强了BK通道中的电压传感器/门耦合。
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发表时间: 2008-01
影响因子: 3.8
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作者:
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