Cited by 1,249RNA Research and SplicingRNA and protein synthesis mechanismsProtein Structure and Dynamics

G3BP1 is a tunable switch that triggers phase separation to assemble stress granules

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Yang, Peiguo, Mathieu, Cécile, Kolaitis, Regina-Maria, Zhang, Peipei, Messing, James, Yurtsever, Ugur, Yang, Zemin, Wu, Jinjun +7 more·2020·Cell

Abstract

The mechanisms underlying ribonucleoprotein (RNP) granule assembly, including the basis for establishing and maintaining RNP granules with distinct composition, are unknown. One prominent type of RNP granule is the stress granule (SG), a dynamic and reversible cytoplasmic assembly formed in eukaryotic cells in response to stress. Here, we show that SGs assemble through liquid-liquid phase separation (LLPS) arising from interactions distributed unevenly across a core protein-RNA interaction network. The central node of this network is G3BP1, which functions as a molecular switch that triggers RNA-dependent LLPS in response to a rise in intracellular free RNA concentrations. Moreover, we show that interplay between three distinct intrinsically disordered regions (IDRs) in G3BP1 regulates its intrinsic propensity for LLPS, and this is fine-tuned by phosphorylation within the IDRs. Further regulation of SG assembly arises through positive or negative cooperativity by extrinsic G3BP1-binding factors that strengthen or weaken, respectively, the core SG network.

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Cited by

Sorted by citations

Authors
Yang, P., Mathieu, C., Kolaitis, R.-M., Zhang, P., Messing, J., Yurtsever, U., Yang, Z., Wu, J., Li, Y., Pan, Q., Yu, J., Martin, E. W., Mittag, T., Kim, H. J., & Taylor, J. P.
Affiliations
St. Jude Children's Research Hospital (US)
Corresponding author
Taylor, J. Paul
Venue
Cell
Publisher
Elsevier BV
Published
2020-04
Volume
181
Issue
2
Pages
325-345.e28
ISSN
0092-8674 (ISSN-L)
OpenAlex
W3016592635
Cited by
1,249
References
4
Citations by year
2026: 241 · 2025: 245 · 2024: 211 · 2023: 191 · 2022: 152 · 2021: 160 · 2020: 48 · 2012: 1
FWCI
44.14
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Cell
Funders
Howard Hughes Medical Institute
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
G3BP1, stress granules, liquid-liquid phase separation, ribonucleoprotein granules, intrinsically disordered regions, phosphorylation, cooperativity
MeSH terms
RNA Recognition Motif Proteins, Poly-ADP-Ribose Binding Proteins, Cytoplasm, Cytoplasmic Granules, DNA Helicases, Humans, Phosphorylation, Ribonucleoproteins, RNA, RNA Helicases, Cytoplasmic Structures, Cell Line, Tumor, HEK293 Cells

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