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Closed-state inactivation and pore-blocker modulation mechanisms of human CaV2.2

Published:2 November 2021 DOI: 10.1016/j.celrep.2021.109931 PMID: 34731621
Yanli Dong, Yiwei Gao, Shuai Xu, Yuhang Wang, Zhuoya Yu, Yue Li, Bin Li, Tian Yuan, Bei Yang, Xuejun Cai Zhang, Daohua Jiang, Zhuo Huang, Yan Zhao

Abstract

N-type voltage-gated calcium (CaV) channels mediate Ca2+ influx at presynaptic terminals in response to action potentials and play vital roles in synaptogenesis, release of neurotransmitters, and nociceptive transmission. Here, we elucidate a cryo-electron microscopy (cryo-EM) structure of the human CaV2.2 complex in apo, ziconotide-bound, and two CaV2.2-specific pore blockers-bound states. The second voltage-sensing domain (VSD) is captured in a resting-state conformation, trapped by a phosphatidylinositol 4,5-bisphosphate (PIP2) molecule, which is distinct from the other three VSDs of CaV2.2, as well as activated VSDs observed in previous structures of CaV channels. This structure reveals the molecular basis for the unique inactivation process of CaV2.2 channels, in which the intracellular gate formed by S6 helices is closed and a W-helix from the domain II-III linker stabilizes closed-state inactivation. The structures of this inactivated, drug-bound complex lay a solid foundation for developing new state-dependent blockers for treatment of chronic pain.

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