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TitleUnified polymerization mechanism for the assembly of ASC-dependent inflammasomes.
Journal, issue, pagesCell, Vol. 156, Issue 6, Page 1193-1206, Year 2014
Publish dateMar 13, 2014
AuthorsAlvin Lu / Venkat Giri Magupalli / Jianbin Ruan / Qian Yin / Maninjay K Atianand / Matthijn R Vos / Gunnar F Schröder / Katherine A Fitzgerald / Hao Wu / Edward H Egelman /
PubMed AbstractInflammasomes elicit host defense inside cells by activating caspase-1 for cytokine maturation and cell death. AIM2 and NLRP3 are representative sensor proteins in two major families of inflammasomes. ...Inflammasomes elicit host defense inside cells by activating caspase-1 for cytokine maturation and cell death. AIM2 and NLRP3 are representative sensor proteins in two major families of inflammasomes. The adaptor protein ASC bridges the sensor proteins and caspase-1 to form ternary inflammasome complexes, achieved through pyrin domain (PYD) interactions between sensors and ASC and through caspase activation and recruitment domain (CARD) interactions between ASC and caspase-1. We found that PYD and CARD both form filaments. Activated AIM2 and NLRP3 nucleate PYD filaments of ASC, which, in turn, cluster the CARD of ASC. ASC thus nucleates CARD filaments of caspase-1, leading to proximity-induced activation. Endogenous NLRP3 inflammasome is also filamentous. The cryoelectron microscopy structure of ASC(PYD) filament at near-atomic resolution provides a template for homo- and hetero-PYD/PYD associations, as confirmed by structure-guided mutagenesis. We propose that ASC-dependent inflammasomes in both families share a unified assembly mechanism that involves two successive steps of nucleation-induced polymerization. PAPERFLICK:
External linksCell / PubMed:24630722 / PubMed Central
MethodsEM (helical sym.)
Resolution3.8 Å
Structure data

EMDB-5830, PDB-3j63:
Unified assembly mechanism of ASC-dependent inflammasomes
Method: EM (helical sym.) / Resolution: 3.8 Å

Source
  • homo sapiens (human)
KeywordsAPOPTOSIS / helical polymer / variable twist / death domain

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