期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-11733-5
关键词
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资金
- National Institutes of Health [R35NS097241, DP2EB020402, R21AR072910]
- National Institutes of Health Intramural Research Program
- US National Institute of Environmental Health Sciences [ZIC ES103326]
- Pew Charitable Trusts
- Amgen
- National Science Foundation Graduate Student Research Fellowship
- NIH [S10OD021634]
- NATIONAL INSTITUTE OF ENVIRONMENTAL HEALTH SCIENCES [ZICES103326] Funding Source: NIH RePORTER
The transient receptor potential melastatin 2 (TRPM2) channel plays a key role in redox sensation in many cell types. Channel activation requires binding of both ADP-ribose (ADPR) and Ca2+. The recently published TRPM2 structures from Danio rerio in the ligand-free and the ADPR/Ca2+-bound conditions represent the channel in closed and open states, which uncovered substantial tertiary and quaternary conformational rearrangements. However, it is unclear how these rearrangements are achieved within the tetrameric channel during channel gating. Here we report the cryo-electron microscopy structures of Danio rerio TRPM2 in the absence of ligands, in complex with Ca2+ alone, and with both ADPR and Ca2+, resolved to similar to 4.3 angstrom, similar to 3.8 angstrom, and similar to 4.2 angstrom, respectively. In contrast to the published results, our studies capture ligand-bound TRPM2 structures in two-fold symmetric intermediate states, offering a glimpse of the structural transitions that bridge the closed and open conformations.
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