X-ray structure of acid-sensing ion channel 1-snake toxin complex reveals open state of a Na(+)-selective channel.

X-ray structure of acid-sensing ion channel 1-snake toxin complex reveals open state of a Na(+)-selective channel.
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DOI:
10.1016/j.cell.2014.01.011
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发表时间:
2014-02-13
期刊:
影响因子:
64.5
通讯作者:
Gouaux E
Gouaux E
中科院分区:
生物学1区
文献类型:
--
作者:
Baconguis I;Bohlen CJ;Goehring A;Julius D;Gouaux E

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酸传感离子通道 (ASIC) 检测炎症或缺血性损伤期间产生的细胞外质子,属于变性蛋白/上皮钠通道超家族。在这里,我们确定了鸡 ASIC1a 与 MitTx(一种来自德克萨斯珊瑚蛇的疼痛诱导毒素)的共晶结构,以定义 ASIC1a 开放状态的结构。在MitTx结合的开放状态和先前确定的低pH脱敏状态下,TM2是不连续的α-螺旋,其中Gly-Ala-Ser选择性过滤器采用延伸的带状构象,将TM2的细胞质三分之一与相邻亚基交换。选择性过滤器的 Gly 443 残基提供了一个由 3 个羰基氧原子组成的环,半径约为 3.6 Å,为水合离子提供了能量屏障。 ASIC1a-MitTx 复合体阐明了 MitTx 作用机制,定义了电压无关、钠选择性离子通道的选择性过滤器的结构,并捕获 ASIC 的打开状态。
Acid sensing ion channels (ASICs) detect extracellular protons produced during inflammation or ischemic injury and belong to the super family of degenerin/epithelial sodium channels. Here, we determine the cocrystal structure of chicken ASIC1a with MitTx, a pain-inducing toxin from the Texas coral snake, to define the structure of the open state of ASIC1a. In the MitTx-bound open state and in the previously determined low pH desensitized state, TM2 is a discontinuous α-helix in which the Gly-Ala-Ser selectivity filter adopts an extended, belt-like conformation, swapping the cytoplasmic one-third of TM2 with an adjacent subunit. Gly 443 residues of the selectivity filter provide a ring of 3 carbonyl oxygen atoms with a radius of ~3.6 Å, presenting an energetic barrier for hydrated ions. The ASIC1a-MitTx complex illuminates the mechanism of MitTx action, defines the structure of the selectivity filter of voltage-independent, sodium-selective ion channels and captures the open state of an ASIC.
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