Mu-theraphotoxin-Cg1a

UniProtKB accession:  B1P1F7

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UniProtKB description:  Potent and selective inhibitor of hNav1.7/SCN9A (IC(50)=610 nM) (PubMed:29393892). Also shows a weak activity towards Nav1.3/SCN3A (IC(50)=7950 nM) (PubMed:29393892). In addition, inhibits voltage-gated potassium channels (Kv) in rat DRG neurons (PubMed:18581053). It does not alter the voltage dependence of activation, but it causes a small hyperpolarizing shift in the steady-state inactivations of Nav1.7/SNC9A (PubMed:29393892). Chimera experiments show that the toxin binds to the DIIS3-S4 linker (site 4) of Nav1.7/SCN9A, whereas Nav1.7/SCN9A Asp-827 residue is shown by substitution experiments to be critical for its sensitivity (PubMed:19463735, PubMed:29393892). The toxin traps the domain II voltage sensor in the closed configuration, and not in an outward position (PubMed:29393892). In vivo, shows analgesic activity in three rodent pain models (formalin-induced, acid-induced, and thermal) (PubMed:29393892).