Stopped-Flow Fluorometric Ion Flux Assay for Ligand-Gated Ion Channel Studies

Methods Mol Biol. 2018:1684:223-235. doi: 10.1007/978-1-4939-7362-0_17.


Quantitative investigations into functional properties of purified ion channel proteins using standard electrophysiological methods are challenging, in particular for the determination of average ion channel behavior following rapid changes in experimental conditions (e.g., ligand concentration). Here, we describe a method for determining the functional activity of liposome-reconstituted K+ channels using a stopped-flow fluorometric ion flux assay. Channel activity is quantified by measuring the rate of fluorescence decrease of a liposome-encapsulated fluorophore, specifically quenched by thallium ions entering the liposomes via open channels. This method is well suited for studying the lipid bilayer dependence of channel activity, the activation and desensitization kinetics of ligand-dependent K+ channels, and channel modulation by channel agonists, blockers, or other antagonists.

Keywords: ANTS quenching; Ion channel function; Liposomal ion flux assay; Stopped-flow assay; Thallium.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Fats / chemistry*
  • Fluorometry
  • Humans
  • Ligand-Gated Ion Channels / metabolism*
  • Lipid Bilayers / metabolism
  • Liposomes / metabolism
  • Potassium Channels / metabolism*


  • Fats
  • Ligand-Gated Ion Channels
  • Lipid Bilayers
  • Liposomes
  • Potassium Channels
  • tallow