Ion currents through Kir potassium channels are gated by anionic lipids

Ion currents through Kir potassium channels are gated by anionic lipids
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通过 Kir 钾通道的离子电流由阴离子脂质门控

DOI:
10.1101/2021.09.21.461288
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发表时间:
2021
期刊:
--
影响因子:
--
通讯作者:
Jin R
Jin R
中科院分区:
--
文献类型:
--
作者:
Jin R

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通过钾离子通道的离子电流是门控的。内部螺旋束的离子传导途径(Kir钾通道的教科书门)的收缩已被证明是一种无效的渗透控制,在我们对这些通道如何门控的理解中造成了裂缝。在这里,我们提出的证据表明,阴离子脂质作为相互作用的响应元件,足以门钾传导。我们证明了K+渗透的限制屏障位于离子传导途径内,并表明该门是由脂质的脂肪酰基尾部操作的,脂质通过孔壁上的开孔渗透到传导途径中。酰基尾部占据从细胞质界面延伸到传导途径的表面凹槽,提供了一种将细胞信号传递到内部通道的潜在手段,这种信号是由在典型脂质结合位点结合的阴离子脂质头基团介导的。
Ion currents through potassium channels are gated. Constriction of the ion conduction pathway at the inner helix bundle, the textbook gate of Kir potassium channels, has been shown to be an ineffective permeation control, creating a rift in our understanding of how these channels are gated. Here we present evidence that anionic lipids act as interactive response elements sufficient to gate potassium conduction. We demonstrate the limiting barrier to K+permeation lies within the ion conduction pathway and show that this gate is operated by the fatty acyl tails of lipids that infiltrate the conduction pathway via fenestrations in the walls of the pore. Acyl tails occupying a surface groove extending from the cytosolic interface to the conduction pathway provide a potential means of relaying cellular signals, mediated by anionic lipid head groups bound at the canonical lipid binding site, to the internal gate.
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