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Cryo-EM structure of the human TACAN channel in a closed state

By xiaozhe chen, Yaojie Wang, Yang Li, Xuhang Lu, jianan chen, Ming Li, Tianlei Wen, ning liu, Shenghai Chang, Xing Zhang, Xue Yang, Yuequan Shen

Posted 24 Aug 2021
bioRxiv DOI: 10.1101/2021.08.23.457436

TACAN is an ion channel involved in sensing mechanical pain. It has recently been shown to represent a novel and evolutionarily conserved class of mechanosensitive channels. Here, we present the cryoelectron microscopic structure of human TACAN (hTACAN). hTACAN forms a dimer in which each protomer consists of a transmembrane globular domain (TMD) that is formed of six helices and an intracellular domain (ICD) that is formed of two helices. Molecular dynamic simulations suggest that a putative ion conduction pathway is located inside each protomer. Single point mutation of the key residue Met207 significantly increased the surface tension activated currents. Moreover, cholesterols were identified at the flank of each subunit. Our data show the molecular assembly of hTACAN and suggest that the wild type hTACAN is in a closed state, providing a basis for further understanding the activation mechanism of the hTACAN channel.

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