Journal
NATURE
Volume 574, Issue 7777, Pages 206-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41586-019-1584-6
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Funding
- Ministry of Science and Technology of China (National Key R&D Program of China) [2016YFA0502004]
- National Natural Science Foundation of China [91857000, 31622021, 31821091, 31870833]
- Beijing Natural Science Foundation [5192009]
- Young Thousand Talents Program of China
- China Postdoctoral Science Foundation [2016M600856, 2017T100014, 2019M650324, 2019T120014]
- Boya Postdoctoral Fellowship of Peking University
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Soluble guanylate cyclase (sGC) is the primary sensor of nitric oxide. It has a central role in nitric oxide signalling and has been implicated in many essential physiological processes and disease conditions. The binding of nitric oxide boosts the enzymatic activity of sGC. However, the mechanism by which nitric oxide activates the enzyme is unclear. Here we report the cryo-electron microscopy structures of the human sGC alpha 1 beta 1 heterodimer in different functional states. These structures revealed that the transducer module bridges the nitric oxide sensor module and the catalytic module. Binding of nitric oxide to the beta 1 haem-nitric oxide and oxygen binding (H-NOX) domain triggers the structural rearrangement of the sensor module and a conformational switch of the transducer module from bending to straightening. The resulting movement of the N termini of the catalytic domains drives structural changes within the catalytic module, which in turn boost the enzymatic activity of sGC.
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