Molecular interaction of δ‐conotoxins with voltage‐gated sodium channels
- 16 June 2005
- journal article
- Published by Wiley in FEBS Letters
- Vol. 579 (18), 3881-3884
- https://doi.org/10.1016/j.febslet.2005.05.077
Abstract
Various neurotoxic peptides modulate voltage-gated sodium (Na(V)) channels and thereby affect cellular excitability. Delta-conotoxins from predatory cone snails slow down inactivation of Na(V) channels, but their interaction site and mechanism of channel modulation are unknown. Here, we show that delta-conotoxin SVIE from Conus striatus interacts with a conserved hydrophobic triad (YFV) in the domain-4 voltage sensor of Na(V) channels. This site overlaps with that of the scorpion alpha-toxin Lqh-2, but not with the alpha-like toxin Lqh-3 site. Delta-SVIE functionally competes with Lqh-2, but exhibits strong cooperativity with Lqh-3, presumably by synergistically trapping the voltage sensor in its "on" position.Keywords
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