Stress granules protect ER-exit sites from TDP43 aggregation
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ABSTRACT: Aggregation of proteins under cellular stress plays key roles in age-related degenerative diseases, but how different proteins coalesce to form inclusions that vary in composition, morphology, molecular dynamics and physiological consequences is poorly understood. We employed a general reporter to identify proteins forming aggregates under proteotoxic stress in human cells. Over 300 proteins were identified, forming different inclusions containing subsets of aggregating proteins. In particular, TDP43, implicated in Amyotrophic Lateral Sclerosis (ALS), partitions dynamically between two distinct types of aggregates: stress granule (SG) and a previously unknown solid inclusion containing components of the ER exit sites (ERES), such as SEC16A. TDP43 accumulation at ERES is antagonized by SG assembly, but enhanced by certain ALS-associated mutations. TDP43-ERES aggregation biases toward nascent TDP43 and, unlike SG, does not contain RNA. Such aggregation causes defects in ER-to-Golgi protein transport, providing a link between TDP43 aggregation and compromised cellular function in ALS patient neurons.
ORGANISM(S): Homo Sapiens (human)
SUBMITTER: Rong Li
PROVIDER: PXD041480 | JPOST Repository | Fri Apr 12 00:00:00 BST 2024
REPOSITORIES: jPOST
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