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ProTx-III

µ-theraphotoxin-Tp1a, µ-TRTX-Tp1a, Protoxin III, ProTx III

A Potent Blocker of NaV1.7 Channels

Cat #: STP-150
Alternative Name µ-theraphotoxin-Tp1a, µ-TRTX-Tp1a, Protoxin III, ProTx III
Lyophilized Powder yes
  • Bioassay Tested
  • Origin Synthetic peptide
    MW: 3802 Da.
    Purity: >98% (HPLC)
    Effective concentration 1-250 nM.
    Sequence DCLKFGWKCNPRNDKCCSGLKCGSNHNWCKLHI.
    Modifications Disulfide bonds between Cys2-Cys17, Cys9-Cys22, and Cys16-Cys29. Ile 33 – C-terminal amidation.
    Structure
    Molecular formula C162H246N52O43S6.
    Activity ProTx-III is a potent blocker of NaV1.7 voltage-gated Na+ channels1.
    References-Activity
    1. Cardoso, F.C. et al. (2015) Mol. Pharmacol. 88, 291.
    Shipping and storage Shipped at room temperature. Product as supplied can be stored intact at room temperature for several weeks. For longer periods, it should be stored at -20°C.
    Solubility Any other aqueous buffer. Centrifuge all product preparations before use (10000 x g 5 min).
    Storage of solutions Up to two weeks at 4°C or three months at -20°C.
    Our bioassay
    • Alomone Labs ProTx-III inhibits NaV1.7 currents heterologously expressed in Xenopus oocytes.
      Alomone Labs ProTx-III inhibits NaV1.7 currents heterologously expressed in Xenopus oocytes.
      A.Time course of ProTx-III (#STP-150) blocking action on NaV1.7 currents. Maximum current amplitudes were plotted as a function of time. Membrane potential was held at -100 mV and cells were stimulated by a 100 ms voltage step to -10 mV. 250 nM ProTx-III were perfused as indicated by the bar (green) during 4 min application. B. Superimposed examples of NaV1.7 channel current in the absence (control) and presence (green) of 250 nM ProTx-III (taken from the experiment in A).
    References - Scientific background
    1. Cardoso, F.C. et al. (2015) Mol. Pharmacol. 88, 291.
    2. Namadurai, S. et al. (2015) Open Biol. 5, 140192.
    Scientific background

    ProTx-III (µ-TRTX-Tp1a) originally isolated from the venom of the peruvian green-velvet tarantula Thrixopelma pruries, is a potent blocker of voltage-gated sodium (NaV) channels, with highest affinity towards NaV1.7 with an IC50 of 11.5 nM, and demonstrates analgesic properties in in vivo models1.

    NaV channels are responsible for initiating action potentials in electrically excitable cells. They play an important role in the human pain signalling pathway and are important therapeutic targets for treatment of chronic pain. Mutations in NaV channels are also associated with a range of complex pathologic conditions such as epilepsy, myotonic conditions and cardiac arrhythmias1,2.

    Target NaV1.7 channels
    Net Peptide Content: 100%
    Last update: 24/01/2021

    ProTx-III (#STP-150) is a highly pure, synthetic, and biologically active peptide toxin.

    For research purposes only, not for human use
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