A constricted opening in Kir channels does not impede potassium conduction
The canonical mechanistic model explaining potassium channel gating is of a conformational change that alternately dilates and constricts a collar-like intracellular entrance to the pore. It is based on the premise that K + ions maintain a complete hydration shell while passing between the transmemb...
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Published in | Nature communications Vol. 11; no. 1; pp. 3024 - 13 |
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Main Authors | , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
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Nature Publishing Group UK
15.06.2020
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Abstract | The canonical mechanistic model explaining potassium channel gating is of a conformational change that alternately dilates and constricts a collar-like intracellular entrance to the pore. It is based on the premise that K
+
ions maintain a complete hydration shell while passing between the transmembrane cavity and cytosol, which must be accommodated. To put the canonical model to the test, we locked the conformation of a Kir K
+
channel to prevent widening of the narrow collar. Unexpectedly, conduction was unimpaired in the locked channels. In parallel, we employed all-atom molecular dynamics to simulate K
+
ions moving along the conduction pathway between the lower cavity and cytosol. During simulations, the constriction did not significantly widen. Instead, transient loss of some water molecules facilitated K
+
permeation through the collar. The low free energy barrier to partial dehydration in the absence of conformational change indicates Kir channels are not gated by the canonical mechanism.
The transition between conducting and non-conducting states of K
+
channels has been explained by conformational changes at the intracellular entrance to the conduction pathway. Here authors demonstrate that control over K
+
currents in Kir channels is not explained by the canonical pore-gating model, as conduction is not impaired by a constricted inner helix bundle. |
---|---|
AbstractList | The canonical mechanistic model explaining potassium channel gating is of a conformational change that alternately dilates and constricts a collar-like intracellular entrance to the pore. It is based on the premise that K
ions maintain a complete hydration shell while passing between the transmembrane cavity and cytosol, which must be accommodated. To put the canonical model to the test, we locked the conformation of a Kir K
channel to prevent widening of the narrow collar. Unexpectedly, conduction was unimpaired in the locked channels. In parallel, we employed all-atom molecular dynamics to simulate K
ions moving along the conduction pathway between the lower cavity and cytosol. During simulations, the constriction did not significantly widen. Instead, transient loss of some water molecules facilitated K
permeation through the collar. The low free energy barrier to partial dehydration in the absence of conformational change indicates Kir channels are not gated by the canonical mechanism. The canonical mechanistic model explaining potassium channel gating is of a conformational change that alternately dilates and constricts a collar-like intracellular entrance to the pore. It is based on the premise that K + ions maintain a complete hydration shell while passing between the transmembrane cavity and cytosol, which must be accommodated. To put the canonical model to the test, we locked the conformation of a Kir K + channel to prevent widening of the narrow collar. Unexpectedly, conduction was unimpaired in the locked channels. In parallel, we employed all-atom molecular dynamics to simulate K + ions moving along the conduction pathway between the lower cavity and cytosol. During simulations, the constriction did not significantly widen. Instead, transient loss of some water molecules facilitated K + permeation through the collar. The low free energy barrier to partial dehydration in the absence of conformational change indicates Kir channels are not gated by the canonical mechanism. The transition between conducting and non-conducting states of K + channels has been explained by conformational changes at the intracellular entrance to the conduction pathway. Here authors demonstrate that control over K + currents in Kir channels is not explained by the canonical pore-gating model, as conduction is not impaired by a constricted inner helix bundle. The canonical mechanistic model explaining potassium channel gating is of a conformational change that alternately dilates and constricts a collar-like intracellular entrance to the pore. It is based on the premise that K + ions maintain a complete hydration shell while passing between the transmembrane cavity and cytosol, which must be accommodated. To put the canonical model to the test, we locked the conformation of a Kir K + channel to prevent widening of the narrow collar. Unexpectedly, conduction was unimpaired in the locked channels. In parallel, we employed all-atom molecular dynamics to simulate K + ions moving along the conduction pathway between the lower cavity and cytosol. During simulations, the constriction did not significantly widen. Instead, transient loss of some water molecules facilitated K + permeation through the collar. The low free energy barrier to partial dehydration in the absence of conformational change indicates Kir channels are not gated by the canonical mechanism. The canonical mechanistic model explaining potassium channel gating is of a conformational change that alternately dilates and constricts a collar-like intracellular entrance to the pore. It is based on the premise that K+ ions maintain a complete hydration shell while passing between the transmembrane cavity and cytosol, which must be accommodated. To put the canonical model to the test, we locked the conformation of a Kir K+ channel to prevent widening of the narrow collar. Unexpectedly, conduction was unimpaired in the locked channels. In parallel, we employed all-atom molecular dynamics to simulate K+ ions moving along the conduction pathway between the lower cavity and cytosol. During simulations, the constriction did not significantly widen. Instead, transient loss of some water molecules facilitated K+ permeation through the collar. The low free energy barrier to partial dehydration in the absence of conformational change indicates Kir channels are not gated by the canonical mechanism.The transition between conducting and non-conducting states of K+ channels has been explained by conformational changes at the intracellular entrance to the conduction pathway. Here authors demonstrate that control over K+ currents in Kir channels is not explained by the canonical pore-gating model, as conduction is not impaired by a constricted inner helix bundle. The transition between conducting and non-conducting states of K+ channels has been explained by conformational changes at the intracellular entrance to the conduction pathway. Here authors demonstrate that control over K+ currents in Kir channels is not explained by the canonical pore-gating model, as conduction is not impaired by a constricted inner helix bundle. |
ArticleNumber | 3024 |
Author | Hill, Adam P. Gulbis, Jacqueline M. Miller, David M. Clarke, Oliver B. Johnson, Paul Laver, Derek Burns, Christopher J. Black, Katrina A. Jin, Ruitao He, Sitong Windley, Monique Robinson, Carol V. Smith, Brian J. Bolla, Jani R. |
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BackLink | https://www.ncbi.nlm.nih.gov/pubmed/32541684$$D View this record in MEDLINE/PubMed |
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Snippet | The canonical mechanistic model explaining potassium channel gating is of a conformational change that alternately dilates and constricts a collar-like... The transition between conducting and non-conducting states of K+ channels has been explained by conformational changes at the intracellular entrance to the... |
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Title | A constricted opening in Kir channels does not impede potassium conduction |
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