Lingli He, Zhuoya Yu, Ze Geng, Zhuo Huang, Changjiang Zhang, Yanli Dong, Yiwei Gao, Yuhang Wang, Qihao Chen, Le Sun, Xinyue Ma, Bo Huang, Xiaoqun Wang, Yan Zhao
The low-voltage activated T-type calcium channels regulate cellular excitability and oscillatory behavior of resting membrane potential which trigger many physiological events and have been implicated with many diseases. Here, we determine structures of the human T-type CaV 3.3 channel, in the absence and presence of antihypertensive drug mibefradil, antispasmodic drug otilonium bromide and antipsychotic drug pimozide. CaV 3.3 contains a long bended S6 helix from domain III, with a positive charged region protruding into the cytosol, which is critical for T-type CaV channel activation at low voltage...
April 19, 2022: Nature Communications