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A lipid plug affects K2P6.1(TWIK-2) function.

Abhisek Mondal1, Sangeeta Niranjan1, Daniel L Minor1,2,3,4,5

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Summary
This summary is machine-generated.

Lipid plugs within TWIK channels regulate potassium (K2P) channel function by blocking ion flow. Removing these lipid structures is essential for channel activity, suggesting a novel regulatory mechanism for leak potassium channels.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Molecular Biology

Background:

  • Lipids play a crucial role in ion channel function, but the precise mechanisms remain unclear.
  • The K2P family of leak potassium channels is known to interact with lipids, with previous studies suggesting lipid access regulates channel activity.

Purpose of the Study:

  • To elucidate the structural basis of lipid-channel interactions in K2P6.1 (TWIK2).
  • To investigate the role of lipid binding in regulating K2P channel function.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was used to determine the structures of K2P6.1 (TWIK2) in nanodisc and detergent environments.
  • Mutagenesis studies were performed to assess the functional impact of specific residues on lipid binding and channel activity.

Main Results:

  • Cryo-EM structures revealed a unique conformation of the selectivity filter and a 'lipid plug' composed of two-chain lipids within the K2P6.1 (TWIK2) channel cavity.
  • Lipid plug binding involves a bidentate coordination, with distinct binding sites for the lipid chains.
  • A specific mutation (R257A) altered lipid plug position, highlighting its importance in lipid coordination and suggesting a role in channel gating.

Conclusions:

  • The lipid plug acts as an endogenous blocker, rendering TWIK channels inactive.
  • Removal of the lipid plug is necessary for ion permeation, indicating a novel regulatory mechanism for K2P channel "leak" function.
  • This mechanism allows for cellular control over K2P channel activity based on lipid availability or cellular context.