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Structural insights into the mechanism of human soluble guanylate cyclase
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Structural insights into the mechanism of human soluble guanylate cyclase
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Journal Article
Structural insights into the mechanism of human soluble guanylate cyclase
2019
Overview
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 sGCα1β1 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 β1 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.
Cryo-electron microscopy structures of human soluble guanylate cyclase in inactive and activated states shed light on the activation mechanism of this enzyme by nitric oxide.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 82/16
/ 82/29
/ 82/80
/ 82/83
/ Animals
/ Binding
/ Disease
/ Domains
/ Humanities and Social Sciences
/ Humans
/ Kinases
/ Mice
/ Modules
/ Nitric Oxide Donors - metabolism
/ Oxygen
/ Proteins
/ Science
/ Sensors
/ Soluble Guanylyl Cyclase - chemistry
/ Soluble Guanylyl Cyclase - genetics
/ Soluble Guanylyl Cyclase - metabolism
