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Structural basis for the oligomerization-facilitated NLRP3 activation
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Structural basis for the oligomerization-facilitated NLRP3 activation
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Journal Article
Structural basis for the oligomerization-facilitated NLRP3 activation
2024
Overview
The NACHT-, leucine-rich-repeat-, and pyrin domain-containing protein 3 (NLRP3) is a critical intracellular inflammasome sensor and an important clinical target against inflammation-driven human diseases. Recent studies have elucidated its transition from a closed cage to an activated disk-like inflammasome, but the intermediate activation mechanism remains elusive. Here we report the cryo-electron microscopy structure of NLRP3, which forms an open octamer and undergoes a ~ 90° hinge rotation at the NACHT domain. Mutations on open octamer’s interfaces reduce IL-1β signaling, highlighting its essential role in NLRP3 activation/inflammasome assembly. The centrosomal NIMA-related kinase 7 (NEK7) disrupts large NLRP3 oligomers and forms NEK7/NLRP3 monomers/dimers which is a critical step preceding the assembly of the disk-like inflammasome. These data demonstrate an oligomeric cooperative activation of NLRP3 and provide insight into its inflammasome assembly mechanism.
NLRP3 is a critical intracellular inflammasome sensor and an important clinical target against inflammation-driven human diseases. Here, the authors determined Cryo-EM structures of human NLRP3 in its closed and open states, elucidating the mechanism of NLRP3 inflammasome activation.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
