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C7802

Sigma-Aldrich

Charybdotoxin

≥90% (HPLC)

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Empirical Formula (Hill Notation):
C176H277N57O55S7
CAS Number:
Molecular Weight:
4295.89
MDL number:
NACRES:
NA.32

Quality Level

assay

≥90% (HPLC)

form

powder

storage temp.

−20°C

InChI

1S/C176H277N57O55S7/c1-81(2)58-106-149(263)213-110(62-91-67-191-80-197-91)152(266)215-112(64-127(183)246)156(270)231-135(85(8)240)170(284)219-114(69-234)157(271)200-95(36-25-54-192-174(185)186)138(252)196-68-130(249)199-96(32-17-21-50-177)139(253)222-120-75-291-295-79-124(226-159(273)116(71-236)218-167(281)132(82(3)4)228-155(269)113(65-128(184)247)216-169(283)134(84(7)239)230-154(268)108(59-88-28-13-12-14-29-88)210-145(259)102-44-47-129(248)198-102)166(280)232-137(87(10)242)172(286)233-136(86(9)241)171(285)220-115(70-235)158(272)204-98(34-19-23-52-179)141(255)206-104(45-48-131(250)251)147(261)225-122-77-292-290-74-119(223-143(257)99(35-20-24-53-180)201-140(254)97(33-18-22-51-178)203-153(267)111(63-126(182)245)214-148(262)105(49-57-289-11)208-162(120)276)161(275)205-101(38-27-56-194-176(189)190)144(258)224-121(164(278)211-107(60-89-39-41-92(243)42-40-89)150(264)221-118(73-238)173(287)288)76-293-294-78-123(163(277)207-103(43-46-125(181)244)146(260)202-100(142(256)209-106)37-26-55-193-175(187)188)227-168(282)133(83(5)6)229-160(274)117(72-237)217-151(265)109(212-165(122)279)61-90-66-195-94-31-16-15-30-93(90)94/h12-16,28-31,39-42,66-67,80-87,95-124,132-137,195,234-243H,17-27,32-38,43-65,68-79,177-180H2,1-11H3,(H2,181,244)(H2,182,245)(H2,183,246)(H2,184,247)(H,191,197)(H,196,252)(H,198,248)(H,199,249)(H,200,271)(H,201,254)(H,202,260)(H,203,267)(H,204,272)(H,205,275)(H,206,255)(H,207,277)(H,208,276)(H,209,256)(H,210,259)(H,211,278)(H,212,279)(H,213,263)(H,214,262)(H,215,266)(H,216,283)(H,217,265)(H,218,281)(H,219,284)(H,220,285)(H,221,264)(H,222,253)(H,223,257)(H,224,258)(H,225,261)(H,226,273)(H,227,282)(H,228,269)(H,229,274)(H,230,268)(H,231,270)(H,232,280)(H,233,286)(H,250,251)(H,287,288)(H4,185,186,192)(H4,187,188,193)(H4,189,190,194)/t84-,85-,86-,87-,95+,96+,97+,98+,99+,100+,101+,102+,103+,104+,105+,106+,107+,108+,109+,110+,111+,112+,113+,114+,115+,116+,117+,118+,119+,120+,121+,122+,123+,124+,132+,133+,134+,135+,136+,137+/m1/s1

InChI key

CNVQLPPZGABUCM-LIGYZCPXSA-N

Gene Information

human ... KCNA3(3738)
mouse ... KCNA3(16491)
rat ... KCNA3(29731)

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This Item
P4497P4247P9107
vibrant-m

C7802

Charybdotoxin

assay

≥90% (HPLC)

assay

-

assay

-

assay

-

Gene Information

human ... KCNA3(3738)
mouse ... KCNA3(16491)
rat ... KCNA3(29731)

Gene Information

human ... KCNA3(3738)
mouse ... Kcna3(16491)
rat ... Kcna3(29731)

Gene Information

human ... KCNA3(3738)
mouse ... Kcna3(16491)
rat ... Kcna3(29731)

Gene Information

human ... KCNA3(3738)
mouse ... Kcna3(16491)
rat ... Kcna3(29731)

form

powder

form

lyophilized powder

form

lyophilized powder

form

lyophilized powder

storage temp.

−20°C

storage temp.

−20°C

storage temp.

−20°C

storage temp.

−20°C

Amino Acid Sequence

Glp-Phe-Thr-Asn-Val-Ser-Cys-Thr-Thr-Ser-Lys-Glu-Cys-Trp-Ser-Val-Cys-Gln-Arg-Leu-His-Asn-Thr-Ser-Arg-Gly-Lys-Cys-Met-Asn-Lys-Lys-Cys-Arg-Cys-Tyr-Ser [Disulfide Bridges: 7-28, 13-33, 17-35]

Application

Charybdotoxin has been used:
  • in the inhibition of endothelium-derived hyperpolarizing factor responses
  • in electrophysiological studies, as calcium channel blockers
  • as a transport inhibitor

Biochem/physiol Actions

Charybdotoxin (ChTX) is a scorpion venom, which blocks a voltage-gated potassium channel, by binding to the extracellular loop of the potassium channel.
High (BK) or intermediate (IK1) conductance calcium-activated and voltage-gated (Kv1.3) channel blocker.
Potent and selective inhibitor of the Ca2+-activated K+ channel present in GH3 anterior pituitary cells and primary bovine aortic smooth muscle cells.

Other Notes

Peptide found in the venom of the scorpion Leiurus quinquestriatus.

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)


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J M Doughty et al.
The American journal of physiology, 276(3 Pt 2), H1107-H1112 (1999-03-10)
In rat mesenteric artery, endothelium-derived hyperpolarizing factor (EDHF) is blocked by a combination of apamin and charybdotoxin (ChTX). The site of action of these toxins has not been established. We compared the effects of ChTX and apamin applied selectively to
Solution structure of extracellular loop of human beta4 subunit of BK channel and its biological implication on ChTX sensitivity
Wang Y, et al.
Scientific Reports, 8(1), 4571-4571 (2018)
Cultured heart cells from oyster: an experimental approach for evaluation of the toxicity of the marine pollutant tributyltin
Droguet M, et al.
Aquatic Living Resources, 25(2), 185-194 (2012)
Transepithelial impedance analysis of chloride secretion.
Ashvani K Singh et al.
Methods in molecular medicine, 70, 129-142 (2002-03-29)
The charybdotoxin family of K+ channel-blocking peptides.
C Miller
Neuron, 15(1), 5-10 (1995-07-01)

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