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Disease Associated Mutations in KIR Proteins Linked to Aberrant Inward Rectifier Channel Trafficking

1
Department of Pharmacology and Toxicology, University of Vienna, 1090 Vienna, Austria
2
Department of Medical Physiology, Division of Heart & Lungs, University Medical Center Utrecht, 3584 CM Utrecht, The Netherlands
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Biomolecules 2019, 9(11), 650; https://doi.org/10.3390/biom9110650
Received: 28 August 2019 / Revised: 22 October 2019 / Accepted: 23 October 2019 / Published: 25 October 2019
The ubiquitously expressed family of inward rectifier potassium (KIR) channels, encoded by KCNJ genes, is primarily involved in cell excitability and potassium homeostasis. Channel mutations associate with a variety of severe human diseases and syndromes, affecting many organ systems including the central and peripheral neural system, heart, kidney, pancreas, and skeletal muscle. A number of mutations associate with altered ion channel expression at the plasma membrane, which might result from defective channel trafficking. Trafficking involves cellular processes that transport ion channels to and from their place of function. By alignment of all KIR channels, and depicting the trafficking associated mutations, three mutational hotspots were identified. One localized in the transmembrane-domain 1 and immediately adjacent sequences, one was found in the G-loop and Golgi-export domain, and the third one was detected at the immunoglobulin-like domain. Surprisingly, only few mutations were observed in experimentally determined Endoplasmic Reticulum (ER)exit-, export-, or ER-retention motifs. Structural mapping of the trafficking defect causing mutations provided a 3D framework, which indicates that trafficking deficient mutations form clusters. These “mutation clusters” affect trafficking by different mechanisms, including protein stability. View Full-Text
Keywords: inward rectifier channel; trafficking; alignment; mutation; KCNJ; KIR; disease; structure inward rectifier channel; trafficking; alignment; mutation; KCNJ; KIR; disease; structure
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Zangerl-Plessl, E.-M.; Qile, M.; Bloothooft, M.; Stary-Weinzinger, A.; van der Heyden, M.A.G. Disease Associated Mutations in KIR Proteins Linked to Aberrant Inward Rectifier Channel Trafficking. Biomolecules 2019, 9, 650.

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