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A Specific Blocker of L-Type CaV Channels

Cat #: SPC-500
Alternative Name CaS
Lyophilized Powder yes
  • Bioassay Tested
  • Origin Synthetic peptide
    MW: 7036 Da
    Purity: >98%
    Form Lyophilized powder.
    Effective concentration 500 nM.
    Modifications Disulfide bonds between Cys3-Cys22, Cys17-Cys39, Cys41-Cys52 and Cys53-Cys58.
    Molecular formula C299H468N90O87S10.
    CAS No.: 178805-91-9
    Activity Calciseptine is a specific antagonist of L-type CaV channels1.
    1. de Weille, J.R. et al. (1991) Proc. Natl. Acad. Sci. U.S.A. 88, 2437.
    Shipping and storage Lyophilized powder 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 Calciseptine inhibits CaV1.2 channel current expressed in Xenopus oocytes.
      Alomone Labs Calciseptine inhibits CaV1.2 channel current expressed in Xenopus oocytes.
      A. Representative time course of Calciseptine (#SPC-500) inhibition of CaV1.2 channel currents. Membrane potential was held at -100 mV, current was elicited by a 100 ms voltage ramp to +60 mV every 10 sec, and significantly inhibited by application of 1 µM Calciseptine (green). B. Superimposed traces of CaV1.2 current after application of control (black) and of 1 µM Calciseptine (green), taken from the recording in A.
    References - Scientific background
    1. Schweitz, H. et al. (1990) Toxicon 28, 847.
    2. de Weille, J.R. et al. (1991) Proc. Natl. Acad. Sci. U.S.A. 88, 2437.
    3. Garcia, M.C. et al. (2001) J. Membr. Biol184, 121.
    4. Teramoto, N. et al. (1996) Pflugers Arch432, 462.
    Scientific background

    Calciseptine is a peptide toxin originally isolated from the Dendroaspis p. polylepsis black mamba venom1 and shown to be a specific L-type CaV channel blocker2. However, in skeletal muscle, it increases L-type currents3.

    Calciseptine blocks spontaneous or K+-induced contraction of cardiac and smooth muscle cells2. Using a patch clamp, it was also shown to block specifically L-type CaV channel currents in neuronal cells in culture2 with IC50 values of 15-500 nM. Using the outside-out configuration of patch clamp, it was shown to reduce single L-type channel's open probability and availability as recorded from the guinea pig portal vein4.

    Target L-type Ca2+ channels
    Peptide Content: 100%
    Last update: 08/06/2021

    Calciseptine (#SPC-500) is a highly pure, synthetic, and biologically active peptide toxin.

    For research purposes only, not for human use



    Scientific Background


    Product citations
    1. Chetrit, J. et al. (2013) J. Neurosci. 33, 14840.
    2. Heinke, B. et al. (2011) J. Neurosci. 31, 1313.
    3. José, O. et al. (2010) Biochem. Biophys. Res. Commun. 395, 530.
    4. Malinina, E. et al. (2010) J. Neurophysiol. 104, 200.
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