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- W2063048269 abstract "Three neurotoxins, Jingzhaotoxin-I, -III, and -V (JZTX-I, -III, and -V), isolated from the venom of the Chinese tarantula Chilobrachys Jingzhao, are 29-36-amino acid peptides. Electrophysiological recordings carried out in Xenopus laevis oocytes show that these toxins acted as gating modifier of voltage-dependent K+ channels. They slow the rate of Kv2.1 channel activation and increase the tail current deactivation, suggesting that toxin-bound channels can still open but are modified. JZTX-III selectively inhibits Kv2.1 channels, and JZTX-V exhibits a higher affinity to Kv4.2 channels than to Kv2.1 channels, whereas JZTX-I inhibits Kv2.1 and Kv4.1 channels with low affinity. Structure-function analysis indicates that electrostatic interactions can benefit for toxin affinity and the feature of electrostatic anisotropy may be correlated with the different affinity of the toxins for the Kv2.1 and Kv4.1 channels. Furthermore, phylogenetic analysis of these and other gating modifiers provides clues for the exploration of toxin-channel interaction." @default.
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- W2063048269 date "2007-01-01" @default.
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- W2063048269 title "Effects and mechanism of Chinese Tarantula Toxins on the Kv2.1 potassium channels" @default.
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- W2063048269 doi "https://doi.org/10.1016/j.bbrc.2006.11.086" @default.
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