Mu-cyrtautoxin-As1a - P49268 (TXP3_APOSC)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P49268: 1
The recombinant mu-cyrtautoxin-As1a potently and voltage-independently blocks voltage-gated sodium channels (Nav) of insects. It acts by pluging the outer vestibule of the channel. It acts in combination with a weak (30%) voltage-independent block of insect voltage-gated calcium (Cav) channels (low-voltage and high-voltage channels). Tested on DUM neurons, it inhibits sodium currents with an IC(50) of 540 nM (and a Hill coefficient >1, reflecting an incomplete block at higher concentrations). It induces flaccid paralysis in adult Australian sheep blowfly Lucilia cuprina (PubMed:23473802). Is both paralytic and lethal, when injected into lepidopteran larvae. Is a slower acting toxin, being lethal at 24 hours, but not paralytic at 1 hour post-injection (PubMed:1440641). (data source: UniProt  )
The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. (data source: UniProt  )
Organism (common name): Trap-door spider
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