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• W2938132364 abstract "The voltage-dependent potassium (Kv) channel Kv1.3 regulates leukocyte proliferation, activation, and apoptosis, and altered expression of this channel is linked to autoimmune diseases. Thus, the fine-tuning of Kv1.3 function is crucial for the immune system response. The Kv1.3 accessory protein, potassium voltage-gated channel subfamily E (KCNE) subunit 4, acts as a dominant negative regulatory subunit to both enhance inactivation and induce intracellular retention of Kv1.3. Mutations in KCNE4 also cause immune system dysfunction. Although the formation of Kv1.3-KCNE4 complexes has profound consequences for leukocyte physiology, the molecular determinants involved in the Kv1.3-KCNE4 association are unknown. We now show that KCNE4 associates with Kv1.3 via a tetraleucine motif situated within the carboxy-terminal domain of this accessory protein. This motif would function as an interaction platform, in which Kv1.3 and Ca2+/calmodulin compete for the KCNE4 interaction. Finally, we propose a structural model of the Kv1.3-KCNE4 complex. Our experimental data and the in silico structure suggest that the KCNE4 interaction hides a forward-trafficking motif within Kv1.3 in addition to adding a strong endoplasmic reticulum retention signature to the Kv1.3-KCNE4 complex. Thus, the oligomeric composition of the Kv1.3 channelosome fine-tunes the precise balance between anterograde and intracellular retention elements that control the cell surface expression of Kv1.3 and immune system physiology.-Solé, L., Roig, S. R., Sastre, D., Vallejo-Gracia, A., Serrano-Albarrás, A., Ferrer-Montiel, A., Fernández-Ballester, G., Tamkun, M. M., Felipe, A. The calmodulin-binding tetraleucine motif of KCNE4 is responsible for association with Kv1.3." @default.
• W2938132364 created "2019-04-25" @default.
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• W2938132364 date "2019-04-10" @default.
• W2938132364 modified "2023-10-16" @default.
• W2938132364 title "The calmodulin‐binding tetraleucine motif of KCNE4 is responsible for association with Kv1.3" @default.
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• W2938132364 doi "https://doi.org/10.1096/fj.201801164rr" @default.
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