Thu Sep 12 00:00:00 UTC 2024: ## New Study Uncovers Key Role of S-acylation in Inflammasome Receptor NLRP3’s Golgi Localization

**Sheffield, UK** – Researchers from the University of Sheffield have revealed a crucial mechanism behind the localization of NLRP3, an important pattern recognition receptor involved in the inflammatory response. Their findings, published in the journal *eLife*, demonstrate that S-acylation, a type of lipid modification, plays a critical role in recruiting NLRP3 to the Golgi apparatus.

NLRP3 is a key player in inflammasomes, multimolecular complexes responsible for initiating inflammatory responses to various danger signals. The researchers discovered that the Golgi localization of NLRP3 is critically dependent on the S-acylation of a specific cysteine residue (Cys-130) within the protein. This S-acylation process is dynamic, with NLRP3 constantly cycling on and off the Golgi through a balance of S-acylation and de-acylation.

The study also identified a series of hydrophobic residues preceding Cys-130 that collaborate with the polybasic region of NLRP3 to facilitate its Golgi enrichment. These hydrophobic residues likely provide an initial weak membrane affinity, while S-acylation at Cys-130 strengthens the interaction.

The researchers found that the enhanced recruitment of NLRP3 to the Golgi in response to nigericin, a known activator of NLRP3, is linked to alterations in the S-acylation cycle. Nigericin disrupts Golgi organization and function, potentially limiting the access of thioesterase enzymes, which remove acyl groups from S-acylated proteins. This leads to the accumulation of NLRP3 on the Golgi.

While the precise role of NLRP3’s Golgi localization in inflammasome activation remains unclear, the study highlights the importance of S-acylation in regulating NLRP3’s subcellular localization and function.

This research offers new insights into the complex mechanisms underlying NLRP3 activation and provides potential targets for therapeutic interventions in inflammatory diseases. Further research is needed to fully unravel the intricate interplay between NLRP3’s S-acylation cycle, Golgi localization, and the initiation of inflammation.

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