Entropic clocks in the service of electrical signaling: 'Ball and chain' mechanisms for ion channel inactivation and clustering

Nitzan Zandany, Limor Lewin, Valerie Nirenberg, Irit Orr, Ofer Yifrach

Research output: Contribution to journalReview articlepeer-review

10 Scopus citations

Abstract

Electrical signaling in the nervous system relies on action potential generation, propagation and transmission. Such processes are dynamic in nature and rely on precisely timed events associated with voltage-dependent ion channel conformational transitions between their primary open, closed and inactivated states and clustering at unique membrane sites. In voltage-dependent potassium (Kv) channels, fast inactivation and clustering processes rely on entropic clock chains as described by 'ball and chain' mechanisms, suggesting important roles for such chains in electrical signaling. Here, we consider evidence supporting the proposed 'ball and chain' mechanisms for Kv channel fast inactivation and clustering associated with intrinsically disordered N- and C-terminal regions of the protein, respectively. Based on this comparison, we delineate the requirements that argue for such a process and establish the thermodynamic signature of a 'ball and chain' mechanism. Finally, we demonstrate how 'chain'-level alternative splicing of the Kv channel gene modulates the entropic clock-based 'ball and chain' inactivation and clustering channel functions underlying changes in electrical signaling. As such, the Kv channel model system exemplifies how linkage between alternative splicing and intrinsic disorder enables functional diversity.

Original languageEnglish
Pages (from-to)2441-2447
Number of pages7
JournalFEBS Letters
Volume589
Issue number19
DOIs
StatePublished - 14 Sep 2015

Keywords

  • 'Ball and chain'
  • Clustering
  • Entropic chain
  • Inactivation
  • Intrinsic disorder
  • PSD-95
  • Scaffold protein
  • Voltage-dependent potassium channel

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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