Aug 2026· Cell Death and Differentiation· 0 citations· 49 references
Medicine
TL;DR
It is demonstrated that G3BP1 also stabilises the COPI vesicle protein beta-COP by promoting its interaction with the deubiquitinase USP10, which accelerates its proteasomal degradation.
Abstract
The RNA binding G3BP1 is depleted in several neurodegenerative diseases, yet its functional consequences at the cellular level remain poorly understood. While best known for its critical role in stress granule formation, we demonstrate that G3BP1 also stabilises the COPI vesicle protein beta-COP by promoting its interaction with the deubiquitinase USP10. G3BP1 depletion disrupts this interaction leading to increased ubiquitination of beta-COP, which accelerates its proteasomal degradation. This leads to compromised Golgi structure and function, and impaired lysosomal homeostasis, which causes defective autophagic flux. Consequently, the autophagic clearance of α-synuclein, a protein that can drive Parkinson's disease (PD), is significantly slowed. Importantly, we observe a concurrent reduction of both G3BP1 and beta-COP protein levels in brain sections from PD and dementia with Lewy Body (DLB) patients and from a PD mouse model. These findings reveal a novel mechanistic link between G3BP1, vesicular trafficking, and proteostasis in neurodegeneration.
Huntington's disease (HD) offers a particularly instructive, if sobering, window into what happens when a cell's protein-clearance machinery is asked to do more than it can bear. Background: the ubiquitin-proteasome system (UPS) is the principal route by which short-lived and misfolded proteins are removed from eukaryo...
It is reported, in a large cohort, that GBA-mutated PD patients exhibit lower serum cholesterol levels and cholesterol supplementation was found to enhance the autophagic flux and mitigate α-synuclein accumulation in vitro, whereas AAV-Srebp2 delivery increased α-synuclein clearance in GbaL444P/+ mice.
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