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U7-theraphotoxin Cg1a, JZTX-2, Peptide F2-32.19

An Activator of NaV Channels

Cat #: STJ-150
Alternative Name U7-theraphotoxin Cg1a, JZTX-2, Peptide F2-32.19
Lyophilized Powder yes
  • Bioassay Tested
  • Origin Synthetic peptide
    MW: 3561 Da
    Purity: >98% (HPLC)
    Effective concentration 200-500 nM.
    Modifications Disulfide bonds between Cys2-Cys16, Cys9-Cys21, Cys15-Cys28.
    Molecular formula C154H219N39O45S7.
    Activity Jingzhaotoxin-II significantly slows rapid inactivation of TTX-resistant VGSC in cardiac myocytes and TTX-sensitive Na+ channels1.
    1. Wang, M. et al. (2008) Biochem. Pharmacol. 76, 1716.
    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 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 Jingzhaotoxin-II activates NaV1.5 currents in stably transfected HEK293 cells.
      Alomone Labs Jingzhaotoxin-II activates NaV1.5 currents in stably transfected HEK293 cells.
      A. Time course of Jingzhaotoxin-II (#STJ-150) action. Current area was plotted as a function of time. Holding potential was -100 mV and currents were stimulated every 20 seconds by a voltage step of 50 msec from holding potential to -20 mV. 500 nM Jingzhaotoxin-II was perfused in the period marked by the horizontal bar (green), indicating a toxin-dependent decrease in NaV1.5 currents inactivation. B. Superimposed traces of NaV1.5 currents before and during 7 min application of 500 nM Jingzhaotoxin-II.
    References - Scientific background
    1. Spencer, C.I. et al. (2009) Toxicon 53, 78.
    2. Lopreato, G. F. et al. (2001). Proc. Natl. Acad. Sci. U. S. A. 98, 7588.
    3. Abriel, H. et al. (2005) Trends Cardiovasc. Med. 15, 35.
    4. Wang, M. et al. (2008) Biochem. Pharmacol. 76, 1716.
    Scientific background

    Voltage-gated Na+ channels play a very important role in the upstroke of action potentials, forming the basis for electrical signaling in the nervous system, and control the flow of ions across plasma membrane in response to changes in voltage1. In vertebrates, nine different pore-forming Na+ channels α subunits have been characterized and cloned in cardiac myocytes, neurons, and skeletal muscle. These Na+ channel isoforms are often classified as TTX-sensitive (NaV1.1–1.4, NaV1.6, and NaV1.7) and TTX-resistant (NaV1.5, NaV1.8, and NaV1.9)2.

    NaV1.5, the major cardiac voltage-gated Na+ channel, plays a central role in the generation of the cardiac action potential and in the propagation of electrical impulses in the heart3.

    Jingzhaotoxin-II, a 32-residue polypeptide, isolated from the venom of Chinese tarantula Chilobrachys jingzhao. JZTX-II has a high affinity for the tetrodotoxin-resistant (TTX-R) voltage-gated Na+ channels in cardiac myocytes. It significantly slows rapid inactivation with an IC50 value of 260 nM. Although JZTX-II does not have an effect on TTX-R neuronal channels in DRG neurons it does affect TTX-sensitive Na+ currents by slowing down their inactivation4.

    Target NaV Na+ Channels
    Net Peptide Content: 100%
    Last update: 11/04/2021

    Jingzhaotoxin-II (#STJ-150) is a highly pure, synthetic, and biologically active peptide toxin.

    For research purposes only, not for human use
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