Defining the Caprin-1 Interactome in Unstressed and Stressed Conditions
Document Type
Article
Abstract
Cytoplasmic stress granules (SGs) are dynamic foci containing translationally arrested mRNA and RNA-binding proteins (RBPs) that form in response to a variety of cellular stressors. It has been debated that SGs may evolve into cytoplasmic inclusions observed in many neurodegenerative diseases. Recent studies have examined the SG proteome by interrogating the interactome of G3BP1. However, it is widely accepted that multiple baits are required to capture the full SG proteome. To gain further insight into the SG proteome, we employed immunoprecipitation coupled with mass spectrometry of endogenous Caprin-1, an RBP implicated in mRNP granules. Overall, we identified 1543 proteins that interact with Caprin-1. Interactors under stressed conditions were primarily annotated to the ribosome, spliceosome, and RNA transport pathways. We validated four Caprin-1 interactors that localized to arsenite-induced SGs: ANKHD1, TALIN-1, GEMIN5, and SNRNP200. We also validated these stress-induced interactions in SH-SY5Y cells and further determined that SNRNP200 also associated with osmotic- and thermal-induced SGs. Finally, we identified SNRNP200 in cytoplasmic aggregates in amyotrophic lateral sclerosis (ALS) spinal cord and motor cortex. Collectively, our findings provide the first description of the Caprin-1 protein interactome, identify novel cytoplasmic SG components, and reveal a SG protein in cytoplasmic aggregates in ALS patient neurons. Proteomic data collected in this study are available via ProteomeXchange with identifier PXD023271.
Keywords
amyotrophic lateral sclerosis, Caprin-1, cytoplasmic granules, cytoplasmic inclusions, mass spectrometry, protein-protein interactions, proteomics, RNA binding proteins, stress granules
Publication Date
6-4-2021
Publication Title
Journal of Proteome Research
ISSN
15353893
E-ISSN
15353907
Volume
20
Issue
6
First Page
3165
Last Page
3178
PubMed ID
33939924
Digital Object Identifier (DOI)
10.1021/acs.jproteome.1c00016
Recommended Citation
Vu, Lucas; Ghosh, Asmita; Tran, Chelsea; Tebung, Walters Aji; Sidibé, Hadjara; Garcia-Mansfield, Krystine; David-Dirgo, Victoria; Sharma, Ritin; Pirrotte, Patrick; Bowser, Robert; and Vande Velde, Christine, "Defining the Caprin-1 Interactome in Unstressed and Stressed Conditions" (2021). Translational Neuroscience. 1047.
https://scholar.barrowneuro.org/neurobiology/1047