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首页> 外文期刊>Neuron >The orientation and molecular movement of a k(+) channel voltage-sensing domain.
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The orientation and molecular movement of a k(+) channel voltage-sensing domain.

机译:k(+)通道电压感测域的方向和分子运动。

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摘要

Voltage-gated channels operate through the action of a voltage-sensing domain (membrane segments S1-S4) that controls the conformation of gates located in the pore domain (membrane segments S5-S6). Recent structural studies on the bacterial K(v)AP potassium channel have led to a new model of voltage sensing in which S4 lies in the lipid at the channel periphery and moves through the membrane as a unit with a portion of S3. Here we describe accessibility probing and disulfide scanning experiments aimed at determining how well the K(v)AP model describes the Drosophila Shaker potassium channel. We find that the S1-S3 helices have one end that is externally exposed, S3 does not undergo a transmembrane motion, and S4 lies in close apposition to the pore domain in the resting and activated state.
机译:电压门控通道通过电压感应域(膜片段S1-S4)的作用进行操作,该电压感应域控制位于孔隙域(膜片段S5-S6)中的栅极的构型。最近对细菌K(v)AP钾离子通道的结构研究导致了一种电压感测的新模型,其中S4位于通道外围的脂质中,并作为一部分S3穿过膜移动。在这里,我们描述了可访问性探测和二硫化物扫描实验,旨在确定K(v)AP模型描述果蝇摇床钾通道的能力。我们发现,S1-S3螺旋的一端向外暴露,S3不经历跨膜运动,而S4在静止和激活状态下与孔域紧密并置。

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