The Nav1.5 is a sodium ion channel protein that in humans is encoded by the SCN5A gene. Mutations in the gene are associated with long QT syndrome type 3 (LQT3), Brugada syndrome, primary cardiac conduction disease and idiopathic ventricular fibrillation.
The protein encoded by this gene is an integral membrane protein and tetrodotoxin-resistant voltage-gated sodium channel subunit. The encoded protein is found primarily in cardiac muscle and is responsible for the initial upstroke of the action potential in an electrocardiogram. Defects in this gene are a cause of long QT syndrome type 3 (LQT3), an autosomal dominant cardiac disease.
Nav1.5 has been shown to interact with Syntrophin, alpha 1.
Nav1.5 interacts with ankyrin-G through a nine-amino acid ankyrin-G binding sequence.
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