Synergetic action of domain II and IV underlies persistent current generation in Nav1.3 as revealed by a tarantula toxin.

Synergetic action of domain II and IV underlies persistent current generation in Nav1.3 as revealed by a tarantula toxin.
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狼蛛毒素揭示了结构域 II 和 IV 的协同作用是 Na(v)1.3 中持续电流产生的基础

DOI:
10.1038/srep09241
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发表时间:
2015-03-18
期刊:
影响因子:
4.6
通讯作者:
Liang S
Liang S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Tang C;Zhou X;Zhang Y;Xiao Z;Hu Z;Zhang C;Huang Y;Chen B;Liu Z;Liang S

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通过电压门控钠通道的持续电流(INaP)通过引起膜的长时间去极化来增强神经元的兴奋性。 Nav1.3本质上会产生一个小的INaP,尽管其产生的机制仍不清楚。在本研究中,使用狼蛛毒素 α-hexatoxin-MrVII (RTX-VII) 研究了 Nav1.3 的四个结构域在 INaP 生成中的参与情况。 RTX-VII 激活 Nav1.3 并诱导大量 INaP。提出了预激活状态结合模型来解释毒素通道相互作用的动力学。在 Nav1.3 的四个结构域中,结构域 II 和 IV 可能在毒素诱导的 INaP 中发挥重要作用。结构域IV构建了RTX-VII的结合位点,而结构域II可能不参与与RTX-VII的相互作用,但可以确定RTX-VII的功效。我们基于使用 RTX-VII 作为探针的结果表明,结构域 II 和 IV 协同促进 Nav1.3 中 INaP 的生成。
The persistent current (INaP) through voltage-gated sodium channels enhances neuronal excitability by causing prolonged depolarization of membranes. Nav1.3 intrinsically generates a small INaP, although the mechanism underlying its generation remains unclear. In this study, the involvement of the four domains of Nav1.3 in INaP generation was investigated using the tarantula toxin α-hexatoxin-MrVII (RTX-VII). RTX-VII activated Nav1.3 and induced a large INaP. A pre-activated state binding model was proposed to explain the kinetics of toxin-channel interaction. Of the four domains of Nav1.3, both domain II and IV might play important roles in the toxin-induced INaP. Domain IV constructed the binding site for RTX-VII, while domain II might not participate in interacting with RTX-VII but could determine the efficacy of RTX-VII. Our results based on the use of RTX-VII as a probe suggest that domain II and IV cooperatively contribute to the generation of INaP in Nav1.3.
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