Researchers Map Diverse Binding Poses of Neurotoxins on Human Sodium Channel Nav1.6
Scientists used cryo-electron microscopy to determine how three different agonistic neurotoxins bind to the human sodium channel Nav1.6 at distinct molecular sites. The study reveals multiple binding poses for toxins derived from cone snails and spiders, advancing understanding of how these toxins interact with ion channels. This research has implications for understanding ion channel function and developing therapeutics targeting sodium channels in neurological disorders.
A Nature study employed cryo-EM structural biology to characterize how agonistic neurotoxins bind to human Nav1.6, a voltage-gated sodium channel critical for neuronal signaling. The researchers determined three-dimensional structures of Nav1.6 complexed with toxins Cn2, ι-RXIA, and Pc1a, revealing that these neurotoxins adopt diverse binding poses on the channel. The cryo-EM maps and atomic coordinates have been deposited in public databases (EMDB and PDB), enabling further research. Nav1.6 is particularly important because it localizes to nodes of Ranvier and synapses, where it plays distinct roles in action potential initiation and propagation. Mutations in the SCN8A gene encoding Nav1.6 are associated with epilepsy and intellectual disability, making this channel a relevant target for therapeutic development. The structural insights from this work contribute to the broader effort of using animal-derived toxins as tools to understand ion channel mechanisms and as potential leads for drug discovery.
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Diverse binding poses of agonistic neurotoxins on human Na<sub>v</sub>1.6
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