Referenced in: none

Automatically associated channels: Kv1.1 , Kv1.3 , Kv1.6 , Kv11.1

Title: OdK2, a Kv1.3 channel-selective toxin from the venom of the Iranian scorpion Odonthobuthus doriae.

Authors: Yousra Abdel-Mottaleb, Thomas Vandendriessche, Elke Clynen, Bart Landuyt, Amir Jalali, Hossein Vatanpour, Liliane Schoofs, Jan Tytgat

Journal, date & volume: Toxicon, 2008 Jun 15 , 51, 1424-30

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/18471844

Abstract
The first Kv1.3 channel-selective toxin from the venom of the Iranian scorpion Odonthobuthus doriae (OdK2) was purified, sequenced and characterized physiologically. OdK2 consists of 38 amino acids, including six conserved cysteine and a C-terminal lysine residue, as revealed by the unique use of a quadrupole ion cyclotron resonance Fourier-transform mass spectrometer. Based on multiple sequence alignments, OdK2 was classified as alpha-KTX3.11. The pharmacological effects of OdK2 were studied on a panel of eight different cloned K(+) channels (vertebrate Kv1.1-Kv1.6, Shaker IR and hERG) expressed in Xenopus laevis oocytes. Interestingly, OdK2 selectively inhibits the currents through Kv1.3 channels with an IC50 value of 7.2+/-2.7nM.