Thisproductisfreezedried.Allwatermoleculeshavebeenremoved.
Everylotistried&testedinarelevantBIOLOGicalassay.
OurBioassay
- Pennington,M.W. etal.(1995) Int.J.Pept.ProteinRes. 46,354.
- Beeton,C. etal.(2003) J.Biol.Chem. 278,9928.
- Middleton,R.E. etal.(2003) Biochemistry 42,13698.
- AlomoneLabsStichodactylaToxin-Biotinstainsratcerebellum.Mildlyfixedratcerebellumsectionswereincubatedwith25nMStichodactylaToxin-Biotin(#STS-400-B)followedbystreptavidin-Cy3(red).StainingofPurkinjecells(verticalarrows)isseenacquiredbyA.25xobjectiveB.40xobjective. Usingthe40xobjective,grainsscatteredoverthesomaofpurkinjecellscanbeseen(horizontalarrows).DAPI(blue)isusedasthecounterstain.AlomoneLabsStichodactylaToxin-BiotinblocksKV1.3channelsexpressedin Xenopus oocytes.A.Representativetimecourseof StichodactylaToxin-Biotin(#STS-400-B)inhibitionofKV1.3current.Membranepotentialwasheldat-100mV,currentwaselicitedbya100msvoltagerampto+60mVevery10sec,andsignificantlyinhibitedby1nMStichodactylaToxin-Biotin(green).B.SuperimposedtracesofKV1.3currentfollowingapplicationofcontrol(black)andof1nMStichodactylaToxin-Biotin(green),takenfromtherecordinginA.
- 1.Castaneda,O. etal.(1995) Toxicon 33,603.
- 2.Pennington,M.W. etal.(1995) Int.J.Pept.ProteinRes. 46,354.
- 3.Beeton,C. etal.(2003) J.Biol.Chem. 278,9928.
- 4.Middleton,R.E. etal.(2003) Biochemistry 42,13698.
- 5.Yan,L. etal.(2005) Mol.Pharmacol. 67,1513.
ShK(StichodactylaToxin)isapeptidyltoxinoriginallyisolatedfromthenematocystoftheseaanemone Stichodactylahelianthus.1
ShKblocks KV1.3, KV1.1, KV1.4,and KV1.6 atsubnanomolarconcentrationsandKV3.2channelsat1000-foldhigherconcentrationthanthatrequiredtoinhibitKV1.3channels.IthasbeenshowntoblockKV currentinDRGneurons,todisplacerADIoactiveDendrotoxinfrombrainsynaptosomes1 andinhibitI125-CharyBDotoxinbindingtoJurkatTlymphocyteswithanIC50 of32pM.2,4
EvidencealsosuggeststhatnativeKV currentsinthecentralnervoussystem,whicharepredominantlycarriedby KV1.2 channels,arehighlysensitivetothistoxin.5
AfluorescentlylabeledsyntheticShKisusedtorecognizeandtosortKV1.3containinglymphocytes.4,6
StichodactylaToxin-Biotin (#STS-400-B) isahighlypure,synthetic,andbiologicallyactivepeptidetoxinconjugatedtobiotin.
BenefitsofStichodactylaToxin-Biotin:
✓ Localizationanddistribution
✓ Clusteringandinternalizationkinetics
✓ Livecellimaging
✓ Singlecelldetection
✓ Bindingkinetics
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