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
影响因子:
4.6
通讯作者:
Liang S
中科院分区:
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
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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