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Development of an in vitro assay for the detection of polymerization of the pyrin domain of ASC.
Multicomponent protein complexes called inflammasomes play a major role in the innate immune system by activating proinflammatory cytokines and promoting a highly inflammatory form of programmed cell death, called pyroptosis. A hallmark of the function of the nucleotide-binding domain, leucine-rich repeat and NLRP3-mediated inflammasome assembly is the polymerization of ASC into large filaments. The ASC filaments recruit and activate procaspase-1 by induced proximity. We developed an in vitro assay for monitoring the polymerization of the pyrin domain of ASC by microscale thermophoresis. We have validated the assay by analyzing the effects of buffer conditions, mutations of ASC and the use of seeds on the polymerization behavior of ASC.
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