response to nerve growth factor / globus pallidus development / response to light intensity / response to potassium ion / response to fibroblast growth factor / response to auditory stimulus / corpus callosum development / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / positive regulation of potassium ion transmembrane transport / Voltage gated Potassium channels ...response to nerve growth factor / globus pallidus development / response to light intensity / response to potassium ion / response to fibroblast growth factor / response to auditory stimulus / corpus callosum development / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / positive regulation of potassium ion transmembrane transport / Voltage gated Potassium channels / delayed rectifier potassium channel activity / optic nerve development / neuronal cell body membrane / voltage-gated potassium channel activity / response to amine / kinesin binding / calyx of Held / axolemma / axon terminus / potassium ion transmembrane transport / voltage-gated potassium channel complex / dendrite membrane / cerebellum development / protein tetramerization / potassium ion transport / protein homooligomerization / response to toxic substance / cellular response to xenobiotic stimulus / presynaptic membrane / postsynaptic membrane / transmembrane transporter binding / cell surface / plasma membrane Similarity search - Function
Potassium channel, voltage dependent, Kv3.1 / Potassium channel, voltage dependent, Kv3 / Potassium channel, voltage dependent, Kv / Potassium channel tetramerisation-type BTB domain / BTB/POZ domain / Broad-Complex, Tramtrack and Bric a brac / BTB/POZ domain / Voltage-dependent channel domain superfamily / SKP1/BTB/POZ domain superfamily / Ion transport domain / Ion transport protein Similarity search - Domain/homology
Journal: Nat Commun / Year: 2024 Title: The binding and mechanism of a positive allosteric modulator of Kv3 channels. Authors: Qiansheng Liang / Gamma Chi / Leonardo Cirqueira / Lianteng Zhi / Agostino Marasco / Nadia Pilati / Martin J Gunthorpe / Giuseppe Alvaro / Charles H Large / David B Sauer / Werner Treptow / ...Authors: Qiansheng Liang / Gamma Chi / Leonardo Cirqueira / Lianteng Zhi / Agostino Marasco / Nadia Pilati / Martin J Gunthorpe / Giuseppe Alvaro / Charles H Large / David B Sauer / Werner Treptow / Manuel Covarrubias / Abstract: Small-molecule modulators of diverse voltage-gated K (Kv) channels may help treat a wide range of neurological disorders. However, developing effective modulators requires understanding of their ...Small-molecule modulators of diverse voltage-gated K (Kv) channels may help treat a wide range of neurological disorders. However, developing effective modulators requires understanding of their mechanism of action. We apply an orthogonal approach to elucidate the mechanism of action of an imidazolidinedione derivative (AUT5), a highly selective positive allosteric modulator of Kv3.1 and Kv3.2 channels. AUT5 modulation involves positive cooperativity and preferential stabilization of the open state. The cryo-EM structure of the Kv3.1/AUT5 complex at a resolution of 2.5 Å reveals four equivalent AUT5 binding sites at the extracellular inter-subunit interface between the voltage-sensing and pore domains of the channel's tetrameric assembly. Furthermore, we show that the unique extracellular turret regions of Kv3.1 and Kv3.2 essentially govern the selective positive modulation by AUT5. High-resolution apo and bound structures of Kv3.1 demonstrate how AUT5 binding promotes turret rearrangements and interactions with the voltage-sensing domain to favor the open conformation.
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