Original Article

Residue Phe266 in S5-S6 loop is not critical for Charybdotoxin binding to Ca2+-activated K+ (mSlo1) channels

Authors: Jing Yao, Hui Li, Ge-liang Gan, Ying Wu, Jiu-ping Ding

Abstract

Aim: To gain insight into the interaction between the Charybdotoxin (ChTX) and BK channels.
Methods: Site-directed mutagenesis was used to make two mutants: mSlo1-F266L and mSlo1-F266A. The two mutants were then expressed in Xenopus oocytes and their effects were tested on ChTX by electrophysiology experiments.
Results: We demonstrate an equilibrium dissociation constant Kd= 3.1-4.2 nmol/L for both the mutants mSlo 1-F266L and mSlo 1-F266 A similar to that of the wild-type mSlo1 Kd=3.9 nmol/L.
Conclusion: The residue Phe266 does not play a crucial role in binding to ChTX, which is opposed to the result arising from the simulation of peptide-channel interaction.
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