R&D Systems Inc. Tocris Bioscience Boston Biochem

α-Conotoxin EI

Cat. No. 3124

a-Conotoxin EI Arg-Asp-Hyp-Cys-Cys-Tyr-His-Pro-Thr-Cys-Asn-Met-Ser-Asn-Pro-Gln-Ile-Cys-NH2

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Biological Activity

Selective antagonist of neuromuscular nicotinic receptors α1β1γδ. Displays selectivity for α/δ sites over α/γ sites in Torpedo.

Licensing Information

Sold under license from University of Utah

Technical Data


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

Soluble to 2 mg/ml in 10% acetonitrile
Store at -20°C

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.

Certificate of Analysis / Safety Data Sheet

Certificate of Analysis: View current batch
Safety Data Sheet: View Safety Data Sheet


Martinez et al (1995) α-Conotoxin EI, a new nicotinic acetylcholine receptor antagonist with novel selectivity. Biochemistry 34 14519. PMID: 7578057.

Park et al (2001) Solution conformation of α-Conotoxin EI, a neuromuscular toxin specific for the α1/δ subunit interface of Torpedo nicotinic acetylcholine receptor. J.Biol.Chem. 276 49028. PMID: 11641403.

Lopez-Vera et al (2007) Novel α-conotoxins from Conus spurius and the α-conotoxin EI share high-affinity potentiation and low-affinity inhibition of nicotinic acetylcholine receptors. FEBS Lett. 274 3972.

If you know of a relevant citation for this product please let us know.

Keywords: a-Conotoxin EI, supplier, α1β1δγ, alpha1beta1deltagamma, a1b1dg, selective, nAChR, antagonists, Acetylcholine, Nicotinic, Receptors, Non-Selective, Subtypes, Other, α-conotoxin, alpha-conotoxin, EI, a-ConotoxinEI, conotoxin

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