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Elsevier BV Journal of Biological Chemistry 300(3)
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    초록·키워드

    NEDD4L is a HECT-type E3 ligase that catalyzes the addition of ubiquitin to intracellular substrates such as the cardiac voltage-gated sodium channel, Na<sub>V</sub>1.5. The intramolecular interactions of NEDD4L regulate its enzymatic activity which is essential for proteostasis. For Na<sub>V</sub>1.5, this process is critical as alterations in Na<sup>+</sup> current is involved in cardiac diseases including arrhythmias and heart failure. In this study, we perform extensive biochemical and functional analyses that implicate the C2 domain and the first WW-linker (1,2-linker) in the autoregulatory mechanism of NEDD4L. Through in vitro and electrophysiological experiments, the NEDD4L 1,2-linker was determined to be important in substrate ubiquitination of Na<sub>V</sub>1.5. We establish the preferred sites of ubiquitination of NEDD4L to be in the second WW-linker (2,3-linker). Interestingly, NEDD4L ubiquitinates the cytoplasmic linker between the first and second transmembrane domains of the channel (DI-DII) of Na<sub>V</sub>1.5. Moreover, we design a genetically encoded modulator of Nav1.5 that achieves Na<sup>+</sup> current reduction using the NEDD4L HECT domain as cargo of a Na<sub>V</sub>1.5-binding nanobody. These investigations elucidate the mechanisms regulating the NEDD4 family and furnish a new molecular framework for understanding Na<sub>V</sub>1.5 ubiquitination.

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