Core Viewpoint - The research led by Academician Yan Ning and his team successfully captured the open-state structure of the human Nav1.7 sodium channel, providing critical insights into pain mechanisms and potential analgesic drug development [2][3]. Group 1: Sodium Channel Function and Importance - Voltage-gated sodium channels (Nav) are essential transmembrane proteins that generate and transmit biological electrical signals, controlling key physiological processes such as neurotransmitter release and muscle contraction [6]. - Abnormalities in sodium channel function are closely related to various severe diseases, including epilepsy, arrhythmias, and chronic pain, with over a thousand pathogenic mutations identified in human sodium channel proteins [6][9]. - The rapid inactivation characteristic of sodium channels, which occurs within milliseconds, is crucial for ensuring the "all-or-nothing" principle of action potentials and unidirectional conduction [6]. Group 2: Research Methodology and Findings - The research team utilized veratridine (VTD), a potent sodium channel opener, to stabilize and capture the open state of Nav1.7, overcoming the challenge of capturing this transient state [8]. - Experiments demonstrated that VTD induced a dual regulatory effect on Nav1.7, inhibiting peak current while promoting sustained and tail currents [9]. - The study identified two distinct conformations of Nav1.7, with one showing a pore diameter of 8.2 Å, larger than the hydrated sodium ion diameter, confirming the channel's open state [9]. Group 3: Molecular Mechanism of Fast Inactivation - The research proposed a "wedge model" for the rapid inactivation of sodium channels, explaining how specific structural changes lead to the blocking of ion flow [14]. - The study revealed that mutations associated with sodium channel-related diseases cluster in specific regions, affecting the interaction and conformational coupling necessary for rapid inactivation [15]. Group 4: Implications for Drug Development - The high-resolution structure of Nav1.7 in its open state is significant for the development of analgesic drugs targeting this channel, which is a key focus in drug research for neurological and cardiovascular diseases [17]. - Sodium channels are critical targets for local anesthetics, anti-epileptic drugs, and analgesics, with the ability to selectively bind to specific channel states enhancing therapeutic efficacy and reducing side effects [17].