Catalog Number: 3124
Biological Activity
Selective antagonist of neuromuscular nicotinic receptors α1β1γδ. Displays selectivity for α/δ sites over α/γ sites in Torpedo.
Technical Data
  • M.Wt:
  • Formula:
  • Sequence:

    (Modifications: X = Hyp, Cys-18 = C-terminal amide, Disulfide bridge between 4 - 10, 5 - 17)

  • Solubility:
    Soluble to 2 mg/ml in 10% acetonitrile
  • Storage:
    Store at -20°C
  • CAS No:
The technical data provided above is for guidance only. For batch specific data refer to the Certificate of Analysis. All Tocris products are intended for laboratory research use only.
Additional Information
Licensing Caveats:
Sold under license from University of Utah
Background References
  1. α-Conotoxin EI, a new nicotinic acetylcholine receptor antagonist with novel selectivity.
    Martinez et al.
    Biochemistry, 1995;34:14519
  2. Solution conformation of α-Conotoxin EI, a neuromuscular toxin specific for the α1/δ subunit interface of Torpedo nicotinic acetylcholine receptor.
    Park et al.
    J.Biol.Chem., 2001;276:49028
  3. Novel α-conotoxins from Conus spurius and the α-conotoxin EI share high-affinity potentiation and low-affinity inhibition of nicotinic acetylcholine receptors.
    Lopez-Vera et al.
    FEBS Lett., 2007;274:3972

Have you used α-Conotoxin EI?

Submit a review and receive a $25US/€18/£15/$25CAN amazon gift card if you include an image - $10US/€7/£6/$10CAN Amazon card for reviews without an image. Limited to verified customers in USA, Canada and Europe.

Tocris Bioscience is the leading supplier of novel and exclusive tools for life science research with over 30 years' experience in the industry. Tocris is a Bio-Techne brand.

Order Details


Contact Information


Molarity Calculator

Calculate the mass, volume, or concentration required for a solution.

*When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and SDS / CoA (available online).

R&D Systems Guarantee


Customer Information