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Updated: Dec 17, 2025

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Aromatic interactions with membrane modulate human BK channel activation.

Mahdieh Yazdani1, Guohui Zhang2, Zhiguang Jia1

  • 1Department of Chemistry, University of Massachusetts, Amherst, United States.

Elife
|June 30, 2020
PubMed
Summary
This summary is machine-generated.

The C-linker in large-conductance potassium (BK) channels is crucial for their activation. Even non-specific interactions of this linker with the membrane directly influence BK channel function, highlighting its integral role.

Keywords:
allosteric couplingatomistic simulationchannel gatinghydrophobic dewettingmembrane anchoringmolecular biophysicsstructural biologyxenopus

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Ion Channel Function

Background:

  • Large-conductance potassium (BK) channels are transmembrane proteins regulated by voltage and intracellular calcium (Ca2+).
  • The C-linker is the sole covalent link between the Ca2+ sensing domain and the pore/voltage sensing domains.

Purpose of the Study:

  • To investigate the role of the C-linker in human BK channel activation.
  • To elucidate the mechanisms by which the C-linker influences BK channel gating.

Main Methods:

  • Construction and analysis of linker sequence scrambling mutants in human BK channels.
  • Atomistic simulations to model protein-membrane and protein-protein interactions.
  • Further mutagenesis experiments to validate simulation findings.

Main Results:

  • BK channel activation demonstrated significant sensitivity to C-linker sequence variations.
  • Nonspecific interactions between the C-linker and the cell membrane were shown to directly modulate BK channel activity.
  • The C-linker plays a more direct role in allosteric coupling than previously understood.

Conclusions:

  • The C-linker is a critical modulator of BK channel function, beyond its role as a simple connection.
  • Membrane interactions with the C-linker directly impact channel gating.
  • Covalent linkers in transmembrane proteins should be viewed as integral components of the sensing machinery.