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XB-ART-38434
Biochem Biophys Res Commun 2008 Nov 21;3763:525-30. doi: 10.1016/j.bbrc.2008.09.033.
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A new Kaliotoxin selective towards Kv1.3 and Kv1.2 but not Kv1.1 channels expressed in oocytes.

Abbas N , Belghazi M , Abdel-Mottaleb Y , Tytgat J , Bougis PE , Martin-Eauclaire MF .


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In this paper were described the purification, the sequencing, and the immunological and biological characterization of a new Kaliotoxin analog, Aam-KTX, from the venom of the scorpion Androctonus amoreuxi. The toxin effects on three cloned Kv channels (Kv1.1, Kv1.2, and Kv1.3) were investigated in Xenopus oocytes using electrophysiology experiments. The Aam-KTX preference for Kv1.3 channel versus Kv1.2 was expected (EC(50) values, 1.1+/-0.02 and 10.4+/-1.5 nM, respectively) but its total inefficacy on Kv1.1 was very surprising. 3D molecular modeling of Aam-KTX brought putative answers to this difference in selectivity.

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Species referenced: Xenopus laevis
Genes referenced: kcna1 kcna2 kcna3