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Mechanism underlying delayed rectifying in human voltage-mediated activation Eag2 channel.

Mingfeng Zhang1,2, Yuanyue Shan1,2, Duanqing Pei3

  • 1Fudan University, 200433, Shanghai, China.

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|March 17, 2023
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Summary
This summary is machine-generated.

Researchers reveal the molecular mechanisms of voltage sensing in potassium channels. Six cryo-EM conformations of human Eag2 show how voltage gradients control ion flow, explaining delayed rectifier and Cole-Moore effects.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • Transmembrane voltage gradients are critical physico-chemical signals regulating biological functions via voltage-gated ion channels.
  • The precise molecular mechanisms by which voltage sensing mediates ion flow remain largely unelucidated.

Purpose of the Study:

  • To determine the molecular structure and dynamics of the human Eag2 (hEag2) potassium channel in various functional states.
  • To elucidate the mechanism of voltage transduction and ion permeation in hEag2.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was employed to capture six distinct conformations of hEag2.
  • Structural analysis focused on the selectivity filter, ion permeation pathway, and gating mechanisms.

Main Results:

  • Six cryo-EM structures revealed hEag2 conformations from closed to open states, including pore dilation.
  • The study identified a short S4-S5 linker coupled to constrict sites mediating voltage transduction.
  • An additional potassium ion at the S6 position was linked to delayed rectifier properties and Cole-Moore effects.

Conclusions:

  • The findings provide atomic-level insights into the dynamics of the selectivity filter and ion permeation pathway.
  • The study elucidates the mechanism of voltage transduction and potassium ion current regulation.
  • This work sheds light on the long-sought molecular basis of the Cole-Moore effect in ion channels.