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Regulating Shaker Kv channel clustering by hetero-oligomerization.

Esraa Nsasra1, Guy Peretz1, Irit Orr1

  • 1Department of Life Sciences and the School of Brain Sciences and Cognition, Ben-Gurion University of the Negev, Beersheba, Israel.

Frontiers in Molecular Biosciences
|January 26, 2023
PubMed
Summary

Voltage-gated potassium channel (Kv) clustering is regulated by scaffold proteins. Heteromeric Kv channel assembly, combining high-affinity (A) and low-affinity (B) subunits, precisely controls channel density at membrane sites.

Keywords:
action potentialalternative splicingclusteringhetero-oligomerizationpotassium chanelsscaffold proteinssubunit assembly

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Area of Science:

  • Neuroscience
  • Molecular and Cellular Biology
  • Biophysics

Background:

  • Scaffold proteins mediate voltage-dependent ion channel clustering at specialized membrane domains, crucial for neuronal function.
  • Mechanisms regulating ion channel clustering and density by scaffold proteins remain largely unknown.
  • The Shaker voltage-activated potassium channel (Kv) and its interaction with PSD-95 provide a model system to study these mechanisms.

Purpose of the Study:

  • To investigate how alternative splicing of Kv channel C-terminal chains (A and B variants) influences PSD-95 binding and clustering.
  • To test the hypothesis that heteromeric assembly of Kv channel subunits regulates cluster density.
  • To determine if varying the stoichiometry of high-affinity (A) and low-affinity (B) subunits affects Kv channel cluster density.

Main Methods:

  • Utilized high-resolution microscopy to visualize Kv channel clustering.
  • Employed quantitative clustering analysis to analyze channel distribution.
  • Investigated the assembly of heteromeric Kv channels composed of A and B variants.

Main Results:

  • Demonstrated that A and B Kv channel variants can assemble into heteromeric channels.
  • Showed that the number of high-affinity A subunits within heteromeric channels modulates Kv channel cluster density.
  • Provided evidence for a mechanism regulating Kv channel clustering through subunit composition.

Conclusions:

  • Kv channel clustering density is regulated by the specific subunit composition of heteromeric channels.
  • Alternative splicing and heteromeric assembly offer a mechanism to fine-tune Kv channel clustering and electrical signaling.
  • Findings bridge the molecular-cellular gap in understanding ion channel clustering and its functional implications.