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Sodium channel β-subunit4, also known as SCN4B or Naβ4, is an auxiliary sodium channel subunit that can alter the kinetics of sodium channels.[1] The protein is encoded by the SCN4Bgene.[2] Mutations in the SCN4B are associated with long QT syndrome.[3]
SCN4B might additionally function as a cell adhesion molecule.[4][5]
↑Shimizu, Hideaki (2017). "Parallel homodimer structures of the extracellular domains of the voltage-gated sodium channel β4 subunit explain its role in cell-cell adhesion". J Biol Chem. 27. doi:10.1074/jbc.M117.786509.
Ota T, Suzuki Y, Nishikawa T, et al. (2004). "Complete sequencing and characterization of 21,243 full-length human cDNAs". Nat. Genet. 36 (1): 40–5. doi:10.1038/ng1285. PMID14702039.
Yu FH, Westenbroek RE, Silos-Santiago I, et al. (2003). "Sodium channel beta4, a new disulfide-linked auxiliary subunit with similarity to beta2". J. Neurosci. 23 (20): 7577–85. PMID12930796.
Webb J, Wu FF, Cannon SC (2009). "Slow inactivation of the NaV1.4 sodium channel in mammalian cells is impeded by co-expression of the beta1 subunit". Pflügers Arch. 457 (6): 1253–63. doi:10.1007/s00424-008-0600-8. PMID18941776.