Mu-conotoxin KIIIB - P0C195 (CM3A_CONKI)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P0C195: 1
Mu-conotoxin KIIIA-P1: mu-conotoxins block voltage-gated sodium channels (Nav). This toxin potently blocks Nav1.2/SCN2A and Nav1.4/SCN4A (PubMed:17724025, PubMed:19221510, PubMed:21781281, PubMed:21709136, PubMed:25658507). It also moderately blocks Nav1.1/SCN1A, mNav1.6/SCN8A, and Nav1.7/SCN9A (PubMed:17724025, PubMed:21781281, PubMed:21709136, PubMed:21652775, PubMed:23146020, PubMed:25658507). It also shows a very low activity on Nav1.3/SCN3A (PubMed:17724025, PubMed:21781281). This toxin binds a microsite within the pore different from the tetrodotoxin binding site 1 (tested on Nav1.2) (PubMed:19221510). The block is partial, with a residual current that can be completely blocked by TTX (PubMed:19221510). The toxin probably docks at a more superficial site in the outer vestibule of the channel than does TTX (PubMed:19221510). On rNav1.2/SCN2A, it produces a block that is only partially reversible. The block of Nav1.7 is modified when beta-subunits are coexpressed with the alpha subunit (PubMed:23146020). Hence, blocks of channels containing beta-1 and beta-3 subunits are more potent (compared to channels without beta subunits), whereas blocks of channels containing beta-2 and beta-4 subunits are less potent (compared to channels without beta subunits) (PubMed:23146020). UniProt
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Subunit Structure
Monomer. UniProt
The cysteine framework is III (CC-C-C-CC). Classified in the M-5 branch, since 5 residues stand between the fourth and the fifth cysteine residues. UniProt
  • Organism: Kinoshita's cone
  • Length:
  • UniProt
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