FUNCTION: SwissProt: Q9UQD0 # Mediates the voltage-dependent sodium ion permeability of excitable membranes. Assuming opened or closed conformations in response to the voltage difference across the membrane, the protein forms a sodium-selective channel through which Na(+) ions may pass in accordance with their electrochemical gradient.
SIZE: 1980 amino acids; 225280 Da
SUBUNIT: Interacts with NEDD4 and NEDD4L (By similarity).
SUBCELLULAR LOCATION: Membrane; Multi-pass membrane protein.
DOMAIN: SwissProt: Q9UQD0 The sequence contains 4 internal repeats, each with 5 hydrophobic segments (S1,S2,S3,S5,S6) and one positively charged segment (S4). Segments S4 are probably the voltage-sensors and are characterized by a series of positively charged amino acids at every third position.
PTM: May be ubiquitinated by NEDD4L; which would promote its endocytosis (By similarity).
SIMILARITY: Belongs to the sodium channel family. & Contains 1 IQ domain.