The Outer Pore and Selectivity Filter of TRPA1.

The Outer Pore and Selectivity Filter of TRPA1.
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DOI:
10.1371/journal.pone.0166167
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发表时间:
2016
期刊:
影响因子:
3.7
通讯作者:
Corey DP
Corey DP
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Christensen AP;Akyuz N;Corey DP

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TRPA 1(transient-receptor-potential-related ion channel with ankyrin domains)是多种伤害性信号的直接受体或间接效应子,因此是开发镇痛药物如通道阻断剂的引人注目的靶点。最近,TRPA 1的结构被报道,为通道组装和孔结构提供了见解。在这里,我们报告全细胞和单通道电流记录的野生型人类TRPA 1以及TRPA 1轴承点突变的关键带电残基的外孔。这些测量结果表明,在位置920的谷氨酸盐在收集阳离子进入孔的口部中起着重要作用,通过改变有效表面电位约16 mV,而更远的酸性残基对渗透几乎没有影响。电生理学实验还证实,在位置915的天冬氨酸残基代表的TRPA 1孔的收缩部位,是控制离子渗透的关键。
TRPA1 (transient-receptor-potential-related ion channel with ankyrin domains) is a direct receptor or indirect effector for a wide variety of nociceptive signals, and thus is a compelling target for development of analgesic pharmaceuticals such as channel blockers. Recently, the structure of TRPA1 was reported, providing insights into channel assembly and pore architecture. Here we report whole-cell and single-channel current recordings of wild-type human TRPA1 as well as TRPA1 bearing point mutations of key charged residues in the outer pore. These measurements demonstrate that the glutamate at position 920 plays an important role in collecting cations into the mouth of the pore, by changing the effective surface potential by ~16 mV, while acidic residues further out have little effect on permeation. Electrophysiology experiments also confirm that the aspartate residue at position 915 represents a constriction site of the TRPA1 pore and is critical in controlling ion permeation.
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