Dual role of KATP channel C-terminal motif in membrane targeting and metabolic regulation

Crystal F. Kline, Harley T. Kurata, Thomas J. Hund, Shane R. Cunha, Olha M. Koval, Patrick J. Wright, Matthew Christensen, Mark E. Anderson, Colin G. Nichols, Peter J. Mohler

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46 Scopus citations

Abstract

The coordinated sorting of ion channels to specific plasma membrane domains is necessary for excitable cell physiology. KATP channels, assembled from pore-forming (Kir6.x) and regulatory sulfonylurea receptor subunits, are critical electrical transducers of the metabolic state of excitable tissues, including skeletal and smooth muscle, heart, brain, kidney, and pancreas. Here we show that the C-terminal domain of Kir6.2 contains a motif conferring membrane targeting in primary excitable cells. Kir6.2 lacking this motif displays aberrant channel targeting due to loss of association with the membrane adapter ankyrin-B (AnkB). Moreover, we demonstrate that this Kir6.2 C-terminal AnkB-binding motif (ABM) serves a dual role in KATP channel trafficking and membrane metabolic regulation and dysfunction in these pathways results in human excitable cell disease. Thus, the KATP channel ABM serves as a previously unrecognized bifunctional touch-point for grading K ATP channel gating and membrane targeting and may play a fundamental role in controlling excitable cell metabolic regulation.

Original languageEnglish
Pages (from-to)16669-16674
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume106
Issue number39
DOIs
StatePublished - Sep 29 2009

Keywords

  • Ankyrin
  • Cytoskeleton
  • Diabetes
  • Klr6.2

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    Kline, C. F., Kurata, H. T., Hund, T. J., Cunha, S. R., Koval, O. M., Wright, P. J., Christensen, M., Anderson, M. E., Nichols, C. G., & Mohler, P. J. (2009). Dual role of KATP channel C-terminal motif in membrane targeting and metabolic regulation. Proceedings of the National Academy of Sciences of the United States of America, 106(39), 16669-16674. https://doi.org/10.1073/pnas.0907138106