Ion currents through Kir potassium channels are gated by anionic lipids
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...
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Published in | Nature communications Vol. 13; no. 1; p. 490 |
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Main Authors | , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
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Nature Publishing Group UK
25.01.2022
Nature Publishing Group Nature Portfolio |
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Abstract | 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.
The Kir potassium channels are known to operate and gate without a major conformational change. Here, the authors identify the permeation gate of Kir channels as a steric plug within the conduction pathway, describing how tightly associated anionic lipids pushing into fenestrations in the pore walls engage with the plug to operate the gate. |
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AbstractList | The Kir potassium channels are known to operate and gate without a major conformational change. Here, the authors identify the permeation gate of Kir channels as a steric plug within the conduction pathway, describing how tightly associated anionic lipids pushing into fenestrations in the pore walls engage with the plug to operate the gate. 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.The Kir potassium channels are known to operate and gate without a major conformational change. Here, the authors identify the permeation gate of Kir channels as a steric plug within the conduction pathway, describing how tightly associated anionic lipids pushing into fenestrations in the pore walls engage with the plug to operate the gate. 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. The Kir potassium channels are known to operate and gate without a major conformational change. Here, the authors identify the permeation gate of Kir channels as a steric plug within the conduction pathway, describing how tightly associated anionic lipids pushing into fenestrations in the pore walls engage with the plug to operate the gate. 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. 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. |
ArticleNumber | 490 |
Author | Czabotar, Peter Gulbis, Jacqueline M. Clarke, Oliver B. Johnson, Paul Laver, Derek Wu, Di Black, Katrina A. Jin, Ruitao Wardak, Ahmad Colman, Peter M. He, Sitong Robinson, Carol V. Periasamy, Agalya Smith, Brian J. Bolla, Jani R. |
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Snippet | Ion currents through potassium channels are gated. Constriction of the ion conduction pathway at the inner helix bundle, the textbook gate of Kir potassium... The Kir potassium channels are known to operate and gate without a major conformational change. Here, the authors identify the permeation gate of Kir channels... |
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SubjectTerms | 101/58 631/45/269/1151 631/535/1266 631/535/1267 82/83 9/97 Anions - chemistry Anions - metabolism Binding Sites Channels Conduction Crystallography, X-Ray Grooves Humanities and Social Sciences Humans Ion Channel Gating Ion currents Ion Transport Lipids Liposomes - chemistry Liposomes - metabolism Membrane Lipids - chemistry Membrane Lipids - metabolism Molecular Dynamics Simulation multidisciplinary Mutation Penetration Phosphatidylcholines - chemistry Phosphatidylcholines - metabolism Phosphatidylserines - chemistry Phosphatidylserines - metabolism Phospholipids Plugs Potassium Potassium - metabolism Potassium channels (inwardly-rectifying) Potassium Channels, Inwardly Rectifying - chemistry Potassium Channels, Inwardly Rectifying - genetics Potassium Channels, Inwardly Rectifying - metabolism Regulatory sequences Science Science (multidisciplinary) Walls |
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Title | Ion currents through Kir potassium channels are gated by anionic lipids |
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