1. Academic Validation
  2. Direct Gating of the TRPM2 Channel by cADPR via Specific Interactions with the ADPR Binding Pocket

Direct Gating of the TRPM2 Channel by cADPR via Specific Interactions with the ADPR Binding Pocket

  • Cell Rep. 2019 Jun 18;27(12):3684-3695.e4. doi: 10.1016/j.celrep.2019.05.067.
Peilin Yu 1 Zhenming Liu 2 Xiafei Yu 3 Peiwu Ye 3 Huan Liu 3 Xiwen Xue 2 Lixin Yang 2 Zhongtang Li 2 Yang Wu 4 Cheng Fang 4 Yong Juan Zhao 4 Fan Yang 5 Jian Hong Luo 6 Lin-Hua Jiang 7 Liangren Zhang 2 Lihe Zhang 2 Wei Yang 8
Affiliations

Affiliations

  • 1 Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, P.R. China; Department of Toxicology, School of Public Health, Zhejiang University, Hangzhou, Zhejiang 310058, P.R. China.
  • 2 State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, P.R. China.
  • 3 Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, P.R. China.
  • 4 Laboratory of Cytophysiology, State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen, Guangdong 518055, P.R. China.
  • 5 Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, P.R. China; Kidney Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang 310058, P.R. China.
  • 6 Department of Neurobiology, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China.
  • 7 School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK; Sino-UK Laboratory of Brain Function and Injury of Henan Province and Department of Physiology and Neurobiology, Xinxiang Medical University, Henan 453003, P.R. China.
  • 8 Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, P.R. China; Department of Neurosurgery, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang 310058, P.R. China. Electronic address: [email protected].
Abstract

cADPR is a well-recognized signaling molecule by modulating the RyRs, but considerable debate exists regarding whether cADPR can bind to and gate the TRPM2 channel, which mediates oxidative stress signaling in diverse physiological and pathological processes. Here, we show that purified cADPR evoked TRPM2 channel currents in both whole-cell and cell-free single-channel recordings and specific binding of cADPR to the purified NUDT9-H domain of TRPM2 by surface plasmon resonance. Furthermore, by combining computational modeling with electrophysiological recordings, we show that the TRPM2 channels carrying point mutations at H1346, T1347, L1379, S1391, E1409, and L1484 possess distinct sensitivity profiles for ADPR and cADPR. These results clearly indicate cADPR is a bona fide activator at the TRPM2 channel and clearly delineate the structural basis for cADPR binding, which not only lead to a better understanding in the gating mechanism of TRPM2 channel but also shed LIGHT on a cADPR-induced RyRs-independent Ca2+ signaling mechanism.

Keywords

NUDT9-H domain; TRPM2 channel; cADPR.

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