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Importance of other amino acid residues of the SK3 channel outer vestibule on the potency of BmP05 and ChTX. (a-j) Representative current traces of SK3 channel mutants showing current blocks by BmP05 and ChTX. (a, d) Reduced inhibition of SK3-D492N and SK3-D518N currents by 100 nM BmP05, Significant inhibition of SK3-Q493A, SK3-D495N, and SK3-H522A currents by 100 nM BmP05. (f-j) Decreased inhibition of SK3-D492N, SK3-Q493A, SK3-D495N, SK3-D518N, and SK3-H522A currents by 100 nM ChTX. (k) ,
Mechanism of selective SK3 channel recognition by scorpion toxins, as addressed by molecular modeling and docking simulation approaches. (a) Top view of the narrow gateway in the SK3 channel turrets. The large and small rings of basic residues are designated by dashed lines, colored yellow and purple, respectively. (b) ,