Cerebellar Kv3.3 potassium channels activate TANK-binding kinase 1 to regulate trafficking of the cell survival protein Hax-1

Yalan Zhang, Luis Varela, Klara Szigeti-Buck, Adam Williams, Milan Stoiljkovic, Matija Šestan-Peša, Jorge Henao-Mejia, Pasquale D’Acunzo, Efrat Levy, Richard A. Flavell, Tamas L. Horvath and Leonard K. Kaczmarek ()
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Yalan Zhang: Yale University School of Medicine
Luis Varela: Yale University School of Medicine
Klara Szigeti-Buck: Yale University School of Medicine
Adam Williams: Yale University School of Medicine
Milan Stoiljkovic: Yale University School of Medicine
Matija Šestan-Peša: Yale University School of Medicine
Jorge Henao-Mejia: Yale University School of Medicine
Pasquale D’Acunzo: The Nathan S. Kline Institute for Psychiatric Research
Efrat Levy: The Nathan S. Kline Institute for Psychiatric Research
Richard A. Flavell: Yale University School of Medicine
Tamas L. Horvath: Yale University School of Medicine
Leonard K. Kaczmarek: Yale University School of Medicine

Nature Communications, 2021, vol. 12, issue 1, 1-17

Abstract: Abstract Mutations in KCNC3, which encodes the Kv3.3 potassium channel, cause degeneration of the cerebellum, but exactly how the activity of an ion channel is linked to the survival of cerebellar neurons is not understood. Here, we report that Kv3.3 channels bind and stimulate Tank Binding Kinase 1 (TBK1), an enzyme that controls trafficking of membrane proteins into multivesicular bodies, and that this stimulation is greatly increased by a disease-causing Kv3.3 mutation. TBK1 activity is required for the binding of Kv3.3 to its auxiliary subunit Hax-1, which prevents channel inactivation with depolarization. Hax-1 is also an anti-apoptotic protein required for survival of cerebellar neurons. Overactivation of TBK1 by the mutant channel leads to the loss of Hax-1 by its accumulation in multivesicular bodies and lysosomes, and also stimulates exosome release from neurons. This process is coupled to activation of caspases and increased cell death. Our studies indicate that Kv3.3 channels are directly coupled to TBK1-dependent biochemical pathways that determine the trafficking of cellular constituents and neuronal survival.

Date: 2021
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DOI: 10.1038/s41467-021-22003-8

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