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The T1-tetramerisation domain of Kv1.2 rescues expression and preserves function of a truncated NaChBac sodium channel. | LitMetric
Cytoplasmic domains frequently promote functional assembly of multimeric ion channels. To investigate structural determinants of this process, we generated the 'T1-chimera' construct of the NaChBac sodium channel by truncating its C-terminal domain and splicing the T1-tetramerisation domain of the Kv1.2 channel to the N terminus. Purified T1-chimera channels were tetrameric, conducted Na when reconstituted into proteoliposomes, and were functionally blocked by the drug mibefradil. Both the T1-chimera and full-length NaChBac had comparable expression levels in the membrane, whereas a NaChBac mutant lacking a cytoplasmic domain had greatly reduced membrane expression. Our findings support a model whereby bringing the transmembrane regions into close proximity enables their tetramerisation. This phenomenon is found with other channels, and thus, our findings substantiate this as a common assembly mechanism.
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