p47 Protein Identified as Critical for Dissolving Stress Granules After Heat Stress
Researchers have identified the protein p47 (NSFL1C) as a necessary adaptor for recruiting the AAA-ATPase p97 to dissolve stress granules after heat stress. Stress granules are temporary RNA-protein assemblies that form when cells are under stress and must be cleared once conditions normalize to allow protein synthesis to resume. Failure to disassemble these structures is linked to age-related neurodegenerative diseases, making this finding potentially relevant to understanding disease mechanisms.
A new preprint study on bioRxiv reports that the protein p47 (also called NSFL1C) plays an essential role in dismantling stress granules — transient cellular structures that sequester translation machinery during cellular stress. When cells experience heat stress, stress granule proteins such as G3BP1 become ubiquitylated, a chemical tag that signals the need for disassembly. The researchers show that p47 binds to ubiquitylated G3BP1 and translocates to stress granules in response to multiple types of cellular stressors, where it then recruits the molecular machine p97 (VCP) to break down these structures. When p47 is lost or inactivated, stress granules persist abnormally, mirroring what is seen when p97 itself is inhibited. These findings add p47 to a growing list of p97 co-factors involved in stress granule clearance and may have implications for neurodegenerative diseases in which defective stress granule dissolution has been implicated.
What's missing
As a preprint, this study has not yet undergone peer review, so findings should be interpreted with caution. The study does not address whether p47 loss or dysfunction has been directly observed in neurodegenerative disease models or patient tissue, leaving the clinical relevance as an inference. It is also unclear whether other p97 adaptors can compensate for p47 loss under different stress conditions or in different cell types.
What different sources said
- bioRxivCenter
The p97 adaptor p47/NSFL1C is necessary for stress granule dissolution after heat stress
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