FEATURES

FAMILY

DESCRIPTION

Also known as SCN9A_HUMAN, SCN9A, NENA. 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 (PubMed:7720699, PubMed:17167479, PubMed:25240195, PubMed:26680203, PubMed:15385606, PubMed:16988069, PubMed:17145499, PubMed:19369487, PubMed:24311784). It is a tetrodotoxin-sensitive Na(+) channel isoform (PubMed:7720699). Plays a role in pain mechanisms, especially in the development of inflammatory pain (PubMed:17167479, PubMed:17145499, PubMed:19369487, PubMed:24311784). The sodium channel complex consists of a large, channel-forming alpha subunit (SCN9A) regulated by one or more beta subunits (SCN1B, SCN2B, SCN3B and SCN4B) (PubMed:7720699, PubMed:17167479, PubMed:25240195). SCN1B and SCN3B are non-covalently associated with SCN2A. SCN2B and SCN4B are disulfide-linked to SCN2A. Interacts with NEDD4 and NEDD4L (By similarity). Interacts with the scorpion alpha-toxin CvIV4 (PubMed:21887265). Interacts with the conotoxin GVIIJ (PubMed:24497506). Interacts with the spider huwentoxin-IV (through the extracellular loop S3-S4 of repeat II) (PubMed:20855463, PubMed:21659528, PubMed:30661758, PubMed:30765606). Interacts with the spider protoxin-II (through the extracellular loop S3-S4 of repeats II and IV) (PubMed:20855463, PubMed:21659528, PubMed:30661758, PubMed:30765606). Interacts with the spider beta/delta-theraphotoxin-Pre1a (PubMed:28428547).

EXTERNAL LINKS

SCN9A

Mutations

Mutation(s) distribution

Mutations table