Beta-theraphotoxin-Cm1a - P84507 (TX1_CERMR)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P84507: 2
Inhibits many voltage-gated sodium channels and one voltage-gated calcium channel (Cav2.2/CACNA1B (IC(50)=400 nM), Nav1.2/SCN2A (IC(50)=3-70 nM), Nav1.1/SCN1A (523-1060 nM), Nav1.7/SCN9A (5120 nM), Nav1.4/SCN4A (888 nM or >10 uM) and Nav1.5/SCN5A (323 nM or >10 uM)) (PubMed:16267209, PubMed:27129258, PubMed:28880874). It acts by shifting the voltage dependence of channel activation to more depolarized potentials and by blocking the inward component of the sodium current (PubMed:16267209). On Nav1.7/SCN9A, it has been shown to interact with the S3-S4 loop of domain DII (site 4) (PubMed:27129258). Is significantly more potent against Nav1.2/SCN2A than the other Nav channel subtypes (PubMed:16267209). In vivo, this toxin causes general ataxia, lack of response to stimuli, and semiparalysis (PubMed:16267209). After a few minutes, the mice are unable to stand, and breathing is reduced in rhythm and intensity (PubMed:16267209). Symptoms gradually increase with progressive slowing of breathing and flaccid paralysis, death occurred within 10 to 20 minutes post injection (PubMed:16267209). Animals remain totally flaccid, and no symptoms of excitatory neurotoxicity are observed (PubMed:16267209). UniProt
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The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. UniProt
  • Organism: Straighthorned baboon tarantula
  • Length:
  • UniProt
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