Mu-conotoxin GVIIJ

UniProtKB accession:  X5IWS1

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UniProtKB description:  Mu-conotoxins block voltage-gated sodium channels (Nav). This toxin (GVIIJ(SSG)) blocks Nav1.1/SCN1A (Kd=11 nM), Nav1.2/SCN2A (Kd=11 nM), Nav1.3/SCN3A (Kd=15 nM), Nav1.4/SCN4A (Kd=4.7 nM), Nav1.6/SCN8A (Kd=360 nM) and Nav1.7/SCN9A (Kd=41 nM) (PubMed:24497506, PubMed:26039939). It binds the channel at the newly described site 8, which is composed by two surfaces whose one contains a non-disulfide-bonded cysteine (which is free to covalently bind the toxin Cys-71) (PubMed:24497506). It is noteworthy that coexpression of subunits beta-2 or beta-4 (but not beta-1 or beta-3) protects rNav1.1-1.7 against block by the toxin, since these subunits (thanks to their extracellular domain) covalently bind to the key cysteine of the channel, thus preventing the covalent binding of the toxin (PubMed:24497506, PubMed:25632083).