p47 Protein Identified as Critical for Dissolving Stress Granules After Heat Stress
Researchers found that the p47 protein is necessary for cells to disassemble stress granules—protective RNA-protein structures that form during heat stress—by recruiting the p97 enzyme to these structures. Stress granules normally sequester translation components until stress resolves, and their timely disassembly is essential for cells to resume normal protein synthesis. The discovery adds to understanding of stress granule regulation and may have implications for neurodegenerative diseases linked to p97 dysfunction.
In this preprint study, researchers demonstrate that p47/NSFL1C acts as a critical adaptor protein that enables the dissolution of stress granules formed in response to heat stress. Stress granules are membrane-delimited RNA-protein assemblies that form when cells experience stress, sequestering translation machinery until conditions normalize. The team shows that p47 translocates to stress granules in response to various cellular stressors and is required to recruit the AAA-ATPase p97 (also called VCP) to these structures. This recruitment depends on ubiquitin-dependent interactions, particularly between p47 and the stress granule component G3BP1. Loss of p47 function impairs stress granule disassembly, and the authors note that p97 dysfunction is implicated in age-related neurodegenerative diseases, suggesting the p47-p97 pathway may be relevant to disease mechanisms.
What's missing
The study does not discuss whether p47 dysfunction or dysregulation has been observed in neurodegenerative disease models or patients, nor does it address potential therapeutic targeting of the p47-p97 pathway. Additionally, the generalizability of findings from heat stress to other types of cellular stress is not fully characterized.
What different sources said
- bioRxivCenter
The p97 adaptor p47/NSFL1C is necessary for stress granule dissolution after heat stress
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