The inward rectifier family of potassium (KCNJ) channels regulate vital cellular processes including cell volume, electrical excitability, and insulin secretion. Dysfunction of different isoforms have been linked to numerous diseases including Bartter's, Andersen-Tawil, Smith-Magenis Syndromes, Type II diabetes mellitus, and epilepsy, making them important targets for therapeutic intervention. Using a family-based approach, we succeeded in expressing 10 of 11 human KCNJ channels tested in Saccharomyces cerevisiae. GFP-fusion proteins showed that these channels traffic correctly to the plasma-membrane suggesting that the protein is functional. A 2-step purification process can be used to purify the KCNJ channels to >95% purity in a mono-dispersed form. After incorporation into liposomes, 86Rb+ flux assays confirm the functionality of the purified proteins as inward rectifier potassium channels.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalProtein Expression and Purification
Issue number1
StatePublished - May 2010


  • Expression
  • Inward rectifier
  • Ion channels
  • KCNJ
  • Purification
  • Saccharomyces cerevisiae


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