Apamin, bee venom (SS1-11, SS3-15)

Product Number: 425-10


CAS Number: 24345-16-2
Molecular Weight: 2029.93
Salt Form: Acetate
Purity: >96%
Sequence (3-letter): Cys-Asn-Cys-Lys-Ala-Pro-Glu-Thr-Ala-Leu-Cys-Ala-Arg-Arg-Cys-Gln-Gln-His-NH2 (Cys1-Cys11, Cys3-Cys15)
Sequence (1-letter): CNCKAPETALCARRCQQH-NH2
Storage: -20 °C or below
Solubility: water to 1 mg/mL

Apamin is a peptide toxin found in bee venom that is known to cross the blood-brain barrier. Apamin potently blocks ATP-type Ca+2-activated K+ channels SK1, SK2 and SK3 (low nM to sub-nM IC50), but is inactive against SK4. Apamin is used to elucidate the roles of SK channels in neurons and some cancer cells. It is a globular peptide with disulfide bridges between Cys1-Cys11 (SS1-11) and Cys3-Cys15 (SS3-15).


1. Blatz, A.L. and Magleby, K.L. (1986) “Single apamin-blocked Ca-activated K+ channels of small conductance in cultured rat skeletal muscle” Nature 323: 718 – 720.
2.Burnham, M.P. et al. (2002) “Characterization of an apamin-sensitive small-conductance Ca2+-activated K+ channel in porcine coronary artery endothelium: relevance to EDHF” Br. J. Pharmacol. 135 (5): 1133–1143.




Central Nervous System

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Ambient Temperature


-20 °C or below

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