{"gene":"G3BP1","run_date":"2026-06-09T23:54:44","timeline":{"discoveries":[{"year":2020,"finding":"G3BP1 functions as a molecular switch that triggers RNA-dependent liquid-liquid phase separation (LLPS) to assemble stress granules. Three distinct intrinsically disordered regions (IDRs) regulate its intrinsic propensity for LLPS, and phosphorylation within these IDRs fine-tunes this regulation. Extrinsic G3BP1-binding factors (e.g., Caprin1 promotes, USP10 inhibits) modulate SG assembly through positive or negative cooperativity.","method":"In vitro LLPS reconstitution, phase separation assays, mutagenesis of IDRs and phosphorylation sites, RNA-binding experiments","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution of LLPS in vitro with mutagenesis, replicated in companion paper (PMID:32302572)","pmids":["32302571"],"is_preprint":false},{"year":2020,"finding":"Under non-stress conditions, G3BP1 adopts a compact auto-inhibited state stabilized by electrostatic intramolecular interactions between intrinsically disordered acidic tracts and the positively charged arginine-rich region. Upon release of mRNAs from polysomes during stress, unfolded mRNAs outcompete G3BP auto-inhibitory interactions, inducing a conformational transition that facilitates G3BP clustering through protein-RNA interactions and drives RNA/protein condensate formation.","method":"FRET, NMR, in vitro RNA competition assays, mutagenesis, live-cell imaging","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biophysical methods (FRET, NMR, in vitro assays) with mutagenesis; replicated across two simultaneous papers","pmids":["32302572"],"is_preprint":false},{"year":2016,"finding":"G3BP1 and G3BP2 double knockout abolishes SG formation in response to eIF2α phosphorylation or eIF4A inhibition. Caprin1 binding to G3BP1 promotes SG formation whereas USP10 binding inhibits SG formation; these interactions are mutually exclusive at G3BP1. G3BP1 interacts with 40S ribosomal subunits through its RGG motif, required for SG-mediated condensation. Phosphomimetic G3BP1-S149E fails to rescue SG formation.","method":"CRISPR/KO cell lines, rescue with G3BP1 mutants (S149E, F33W), Co-IP, ribosome fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genetic rescue with multiple defined mutants, replicated across labs","pmids":["27022092"],"is_preprint":false},{"year":2021,"finding":"Stress granule disassembly after heat shock specifically requires ubiquitination of G3BP1. Ubiquitinated G3BP1 interacts with the ER-associated protein FAF2, which engages the ubiquitin-dependent segregase p97/VCP, targeting the stress granule interaction network for disassembly.","method":"Cultured human cells, ubiquitination assays, Co-IP of G3BP1 with FAF2 and p97/VCP, G3BP1 ubiquitination mutants","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP of endogenous proteins, ubiquitination site mapping, functional rescue experiments in a single rigorous study","pmids":["34739333"],"is_preprint":false},{"year":2018,"finding":"G3BP1 physically interacts with cGAS and promotes formation of large cGAS complexes that enhance cGAS DNA binding and cGAS-dependent interferon production. G3BP1 deficiency leads to inefficient DNA binding by cGAS. The small molecule EGCG disrupts G3BP1-cGAS complexes and inhibits DNA-triggered cGAS activation.","method":"Co-IP, G3BP1 knockdown/KO cells, IFN production assays, in vivo mouse model (AGS)","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, KO cell phenotype, in vivo validation; published in high-impact journal with multiple orthogonal methods","pmids":["30510222"],"is_preprint":false},{"year":2001,"finding":"G3BP is a phosphorylation-dependent endoribonuclease that cleaves between cytosine and adenine (CA) via its C-terminal RRM-type RNA binding motif. Phosphorylation at serine 149 controls its subcellular localization: a S149A mutant remains exclusively cytoplasmic whereas a phosphomimetic S149E mutant translocates to the nucleus. G3BP is tightly associated with c-myc mRNA in mouse embryonic fibroblasts, and c-myc mRNA decay is delayed in RasGAP-deficient fibroblasts lacking properly phosphorylated G3BP.","method":"In vitro endoribonuclease assay, RNA binding/cleavage specificity mapping, site-directed mutagenesis (S149A and S149E), subcellular fractionation, mRNA stability assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay with defined cleavage specificity, mutagenesis of catalytic/regulatory residue, functional subcellular localization with consequence","pmids":["11604510"],"is_preprint":false},{"year":1999,"finding":"G3BP1 (HDH VIII) functions as a DNA and RNA helicase with ATP- and Mg2+-dependent activity. It prefers partially unwound 3'-tailed substrates, moves along the bound strand in the 5' to 3' direction, and can unwind partial RNA/DNA and RNA/RNA duplexes. The RGG-box-rich C-terminal domain is analogous to that of other DNA/RNA helicases.","method":"Biochemical purification from HeLa nuclear extract, in vitro helicase assay, microsequencing","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution of helicase activity with substrate specificity characterization; single lab but multiple substrates tested","pmids":["9889278"],"is_preprint":false},{"year":2016,"finding":"G3BP1 arginine residues in its RGG domain are asymmetrically dimethylated by PRMT1 and symmetrically methylated by PRMT5. Increased arginine methylation represses SG assembly, while decreased methylation promotes it. Arsenite stress rapidly and reversibly decreases asymmetric arginine methylation on G3BP1, acting as a regulatory signal for SG formation.","method":"Methylation-specific antibodies, PRMT1/PRMT5 knockdown/overexpression, in vitro methylation assay, SG formation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — biochemical methylation mapping with multiple genetic/pharmacological interventions and functional SG readout; single lab with multiple orthogonal approaches","pmids":["27601476"],"is_preprint":false},{"year":2007,"finding":"Caprin-1 interacts with G3BP-1 via a conserved F(M/I/L)Q(D/E)Sx(I/L)D motif in Caprin-1 that binds the NTF2-like domain of G3BP-1. Caprin-1 and G3BP-1 co-localize in cytoplasmic RNA granules. The carboxy-terminal RGG motifs of Caprin-1 selectively bind c-Myc and cyclin D2 mRNAs. Caprin-1-mediated induction of eIF2α phosphorylation requires its mRNA-binding ability.","method":"Mutagenesis of Caprin-1 motifs, GST pulldown, co-immunoprecipitation, confocal microscopy, eIF2α phosphorylation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — site-directed mutagenesis defining binding motif, reciprocal pulldown/Co-IP, multiple functional readouts in one study","pmids":["17210633"],"is_preprint":false},{"year":2015,"finding":"G3BP1 directly interacts with inactive PKR through both the NTF2-like and PXXP domains of G3BP1. Caprin1 also directly interacts with PKR and is required for efficient PKR activation at stress granules and release of active PKR into the cytoplasm. The G3BP1-Caprin1-PKR complex represents a mode of PKR activation independent of dsRNA pattern recognition, and the PXXP domain of G3BP1 is essential for PKR recruitment to SGs, eIF2α phosphorylation, and antiviral activity.","method":"Direct binding assays, Co-IP, G3BP1 domain deletion mutants, PKR activation assay (eIF2α phosphorylation), viral infection assays","journal":"mBio","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct interaction demonstrated with domain mapping, functional validation through PKR activation and antiviral assay; multiple orthogonal methods","pmids":["25784705"],"is_preprint":false},{"year":2015,"finding":"Viral proteins (e.g., SFV nsP3) and the cellular protein USP10 inhibit SG assembly via FGDF motifs that bind the NTF2-like domain of G3BP1. Both phenylalanine residues and the glycine in the FGDF motif are essential for binding. A crystal structure model of G3BP1-NTF2 bound to an FGDF-containing peptide was generated, revealing the binding mode.","method":"Mutagenesis of FGDF motifs, pulldown, SG formation assays, crystallographic modeling","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structural model plus biochemical validation of binding residues and functional SG consequence; multiple viral and cellular proteins tested","pmids":["25658430"],"is_preprint":false},{"year":2022,"finding":"The NTF2-like domain of G3BP1 contains a conserved surface groove targeted by SARS-CoV-2 nucleocapsid (N) protein residues 1-25 via a φ-x-F motif. Crystal structure of G3BP1-NTF2 in complex with N1-25 peptide revealed surface complementarity. Mutation of key interaction residues disrupts the G3BP1-N interaction in vitro.","method":"X-ray crystallography, isothermal titration calorimetry, mutagenesis, pulldown assays","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with mutagenesis validation and biophysical binding measurements in a single rigorous study","pmids":["35240128"],"is_preprint":false},{"year":2019,"finding":"Acetylation of G3BP1 at lysine-376 (K376) within the RRM RNA-binding domain impairs RNA binding and disrupts RNA-dependent interaction with PABP1 (but not RNA-independent interactions with Caprin-1 or USP10). K376 acetylation is regulated by HDAC6 (eraser) and CBP/p300 (writer). Acetylated G3BP1 is detected outside SGs and increases during SG resolution, suggesting it facilitates SG disassembly.","method":"Acetylation-mimicking (K376Q) and deacetylation-mimicking (K376R) mutants, RNA binding assays, Co-IP, SG formation/dissolution assays, HDAC6/CBP overexpression and knockdown","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — site-specific PTM mapping with functional mutagenesis, identification of writer/eraser enzymes, RNA binding and SG functional readouts","pmids":["31481451"],"is_preprint":false},{"year":2020,"finding":"G3BP1 is required for mRNA decay of transcripts with highly structured 3' UTRs (structure-mediated RNA decay), functioning with UPF1. Depletion of G3BP1 increases steady-state levels of mRNAs with highly structured 3' UTRs and highly structured circular RNAs.","method":"RNA-seq, G3BP1 knockdown, 3' UTR structural manipulation, half-life assays","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide RNA decay analysis with G3BP1 depletion, structural manipulation of 3' UTRs, but mechanism of G3BP1 recruitment to structured RNA not fully resolved biochemically","pmids":["32017897"],"is_preprint":false},{"year":2018,"finding":"G3BP1 directly binds to multiple sequences of the FMDV IRES element via its C-terminal region and interacts directly with polypyrimidine tract-binding protein and eIF4B. G3BP1 reduces local flexibility of the IRES element and negatively regulates both cap-dependent and IRES-dependent translation. G3BP1 is cleaved by FMDV 3C protease at E284.","method":"RNA EMSA, in vitro translation assays, Co-IP, FMDV infection with G3BP1 mutants","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro RNA binding and translation assays, protein interaction mapping; single lab","pmids":["28755480"],"is_preprint":false},{"year":2012,"finding":"G3BP2 forms homo-multimers and hetero-multimers with G3BP1. Double knockdown of G3BP1 and G3BP2 significantly reduces SG formation, whereas single knockdown of either partially reduces it. Overexpression of G3BP2 alone can induce SGs without stress, similar to G3BP1.","method":"siRNA knockdown, Co-IP for heterodimerization, SG formation assays (arsenite, hypoxia, heat shock)","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for interaction, genetic KD for function; single lab, two orthogonal methods","pmids":["23279204"],"is_preprint":false},{"year":2012,"finding":"Assembly of large G3BP-induced stress granules (but not small granules) precedes and triggers eIF2α phosphorylation via PKR. Stress granule size acts as a threshold switch for PKR-mediated eIF2α phosphorylation and translational repression.","method":"G3BP overexpression, MEF cells with eIF2α kinase knockouts, PKR-specific inhibition, eIF2α phosphorylation assays, SG size quantification","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic dissection with kinase KO MEFs plus functional readout; single lab","pmids":["22833567"],"is_preprint":false},{"year":2010,"finding":"G3BP1 directly interacts with the 3' UTR of beta-F1-ATPase mRNA via its RRM domain (confirmed by RNA-bridged trimolecular fluorescence complementation). G3BP1 interaction with beta-F1 mRNA inhibits its translation at the initiation level. This RNP complex localizes to the periphery of mitochondria.","method":"Affinity chromatography, Co-IP, RNA FISH, TriFC assay, polysome profiling, immunoelectron microscopy","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods for interaction (pulldown, TriFC, FISH) and translational readout; single lab","pmids":["20663914"],"is_preprint":false},{"year":2018,"finding":"G3BP1 binds to RIG-I via its C-terminal RGG domain and directly binds viral dsRNA/poly(I:C) also via the RGG domain. G3BP1 overexpression enhances RIG-I-induced IFN-β production, and G3BP1 co-localizes with RIG-I and infecting VSV in cells.","method":"Co-IP, biotin-labeled dsRNA pulldown, in vitro translated G3BP1 binding assay, confocal microscopy, IFN-β reporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding to dsRNA and RIG-I shown by pulldown with in vitro translated protein; functional IFN readout; single lab","pmids":["30804210"],"is_preprint":false},{"year":2019,"finding":"G3BP1 forms a complex with RNF125 and RIG-I; this interaction leads to auto-ubiquitination of RNF125 and thereby reduced RNF125-mediated degradation of RIG-I, promoting RIG-I expression and antiviral signaling.","method":"Co-IP of G3BP1-RNF125-RIG-I complex, ubiquitination assays, G3BP1 KO cells, viral replication assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of endogenous complex, ubiquitination assay; single lab","pmids":["31827077"],"is_preprint":false},{"year":2014,"finding":"G3BP1 recruits PKR to stress granules via its PXXP domain. The G3BP1-SG-PKR axis links SG formation to innate immune transcriptional responses through NF-κB and JNK. Truncated G3BP1 unable to form SGs lacks antiviral activity against enteroviruses.","method":"G3BP1 domain deletion mutants, SG formation assays, PKR Co-IP, NF-κB/JNK reporter assays, viral replication assays","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping with functional readouts, Co-IP; single lab","pmids":["25520508"],"is_preprint":false},{"year":2015,"finding":"G3BP1 depletion or its upstream regulator TDP-43 disturbs normal interactions between stress granules and processing bodies (PBs), reducing SG-PB docking and impairing preservation of polyadenylated mRNA. Reintroduction of G3BP1 alone rescues SG-PB interactions and mRNA preservation.","method":"G3BP1 siRNA, TDP-43 siRNA, live-cell imaging of SG-PB interactions, mRNA stability assays, G3BP1 rescue experiments","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — rescue experiment with G3BP1 alone establishing sufficiency; multiple cell types; single lab","pmids":["25847539"],"is_preprint":false},{"year":2018,"finding":"In axons, G3BP1 forms stress granule-like structures that co-localize with stored axonal mRNAs and limit their translation. Upon axotomy, G3BP1 granules disassemble (associated with increased phospho-G3BP1), releasing mRNAs for local translation to support axon regeneration. Dominant-negative G3BP disrupts axonal SG-like structures, activates intra-axonal translation, increases axon growth, and accelerates nerve regeneration in vivo.","method":"Dominant-negative G3BP overexpression, G3BP1 co-localization with axonal mRNAs by FISH, phospho-G3BP1 immunostaining, nerve regeneration in rat in vivo model","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo nerve regeneration model with functional readout, dominant-negative approach; single lab","pmids":["30135423"],"is_preprint":false},{"year":2020,"finding":"CK2α phosphorylates G3BP1 at Ser149 in axons after injury. Phosphomimetic G3BP1 shows markedly decreased RNA binding in neurons compared to wild-type and non-phosphorylatable G3BP1, releasing axonal mRNAs for translation. CK2α translation itself is regulated by local mTOR-dependent translation and axoplasmic Ca2+ levels.","method":"In vitro kinase assay, phosphomimetic/non-phosphorylatable G3BP1 mutants, RNA binding assay, dual FRAP reporter for axonal translation, CK2α mRNA depletion from axons","journal":"Current biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase assay plus phosphomimetic RNA-binding assay; functional axonal translation measured by FRAP; single lab","pmids":["33065005"],"is_preprint":false},{"year":2023,"finding":"TRIM21 E3 ubiquitin ligase catalyzes K63-linked ubiquitination of G3BP1, which inhibits G3BP1 LLPS in vitro and promotes SG dissolution. Autophagy receptors SQSTM1/p62 and CALCOCO2/NDP52 directly interact with G3BP1 at SG periphery to mediate SG elimination via autophagy.","method":"E3 ligase screen, in vitro ubiquitination assay, LLPS assay with ubiquitinated G3BP1, Co-IP of G3BP1 with p62/NDP52, SG formation/elimination assays in KO cells","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro ubiquitination and LLPS assay, genetic KO of receptors with functional SG readout; single lab","pmids":["36692217"],"is_preprint":false},{"year":2023,"finding":"SIRT2 deacetylates G3BP1 at K257, K276, and K376, leading to disassembly of the cGAS-G3BP1 complex, thereby inhibiting cGAS DNA binding, cGAS droplet formation, and type I IFN production. SIRT2 deficiency elevates IFN expression after HSV-1 infection.","method":"Co-IP of SIRT2-G3BP1, in vitro deacetylation assay, acetylation site mapping, cGAS-G3BP1 complex disruption assay, cGAS DNA binding and LLPS assays, SIRT2 KO mouse model","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct deacetylation assay with site mapping, functional cGAS assays, in vivo validation; single lab","pmids":["37870259"],"is_preprint":false},{"year":2020,"finding":"G3BP1 promotes pre-condensation of cGAS into a primary liquid-phase state in resting cells, enabling more efficient DNA-induced LLPS and rapid cGAS activation. RNA does not activate cGAS and upon DNA challenge, G3BP1 dissociates from cGAS, allowing full cGAS-DNA condensation.","method":"High-resolution microscopy, G3BP1 KO cells, cGAS LLPS assays, G3BP1 inhibition, DNA vs. RNA stimulation experiments","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging of cGAS condensates with G3BP1 KO, LLPS functional assay; single lab","pmids":["34779554"],"is_preprint":false},{"year":2020,"finding":"MAGE-B2 suppresses SG formation by reducing G3BP1 protein levels below the critical concentration for phase separation through translational inhibition of G3BP1. Knockout of the MAGE-B2 mouse ortholog or overexpression of G3BP1 confers hypersensitivity of the male germline to heat stress in vivo.","method":"MAGE-B2 KO mice, G3BP1 overexpression in vivo, polysome profiling (translational inhibition), SG formation assays, heat stress survival","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO in vivo with functional germline phenotype, polysome profiling for translational mechanism; single lab","pmids":["32692974"],"is_preprint":false},{"year":2010,"finding":"MK-STYX (a pseudophosphatase) interacts with G3BP1 and inhibits G3BP1-induced SG formation. The catalytically active mutant of MK-STYX shows dramatically reduced G3BP1 binding and impaired ability to inhibit SG assembly, indicating the inactive phosphatase conformation is required for G3BP1 interaction.","method":"Mass spectrometry identification, Co-IP, G3BP1-induced SG formation assays with MK-STYX wild-type and active-site mutant","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS identification of interaction partner, Co-IP validation, mutagenesis showing conformation-dependence; single lab","pmids":["20180778"],"is_preprint":false},{"year":2007,"finding":"G3BP1 and G3BP2 bind to p53 in vitro and in vivo. G3BP1/2 expression leads to redistribution of p53 from the nucleus to the cytoplasm. G3BP2 (but not G3BP1) additionally associates with MDM2, stabilizes MDM2, and reduces MDM2-mediated p53 ubiquitylation and degradation.","method":"Proteomic pulldown, Co-IP in cells, subcellular fractionation, ubiquitylation assay, shRNA knockdown","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with fractionation, ubiquitylation assay; single lab, distinguishes G3BP1 vs G3BP2 effects","pmids":["17297477"],"is_preprint":false},{"year":2011,"finding":"G3BP binds to BART mRNA and degrades it via its endoribonuclease activity. Intracellular CD24 interacts with G3BP in stress granules and inhibits G3BP's specific endoribonuclease activity toward BART mRNA, leading to increased BART expression and reduced cell invasion.","method":"Co-IP of CD24-G3BP complex, mRNA stability/RNase assays, CD24 knockdown, in vivo orthotopic xenograft model","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA binding and endoribonuclease activity assay with CD24 competition, in vivo validation; single lab","pmids":["21266361"],"is_preprint":false},{"year":2020,"finding":"PRMT8 methylates G3BP1 (the dendritic RNA-binding protein) at arginine residues and suppresses Rac1-PAK1 signaling to control actin cytoskeleton dynamics for dendritic spine maturation. PRMT8 depletion leads to overabundance of filopodia and mis-localization of excitatory synapses.","method":"PRMT8 KD in neurons, co-IP of PRMT8-G3BP1, in vitro methylation assay, Rac1-PAK1 activity assay, spine morphology imaging","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct methylation assay, defined signaling pathway suppression, dendritic spine phenotype; single lab","pmids":["32521269"],"is_preprint":false},{"year":2019,"finding":"eIF4GI is critical for canonical SG formation by directly interacting with G3BP via amino acids 182-203 of eIF4GI and the RNA-binding domain of G3BP. Picornavirus 2A or L proteases block SG formation by disrupting eIF4GI-G3BP1 interaction.","method":"Co-IP, domain deletion mapping, rescue of SG formation by eIF4GI, 2A/L protease cleavage assay","journal":"Cell discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, functional rescue, viral protease disruption; single lab","pmids":["30603102"],"is_preprint":false},{"year":2021,"finding":"G3BP1 interacts with and inactivates GSK-3β (via Co-IP), suppressing GSK-3β-mediated β-catenin phosphorylation and degradation. Elevated G3BP1 stabilizes β-catenin by inhibiting its ubiquitin-proteasome degradation, promoting nuclear accumulation of β-catenin and cell proliferation.","method":"Co-IP of G3BP1-GSK-3β, β-catenin ubiquitination assay, pharmacological disruption of G3BP1-GSK-3β interaction, G3BP1 overexpression/knockdown","journal":"Acta pharmacologica Sinica","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP with pharmacological disruption; mechanism of GSK-3β inactivation not biochemically resolved; single lab","pmids":["33536604"],"is_preprint":false},{"year":2021,"finding":"G3BP1 interacts with SPOP and functions as a competitive inhibitor of the Cul3-SPOP E3 ubiquitin ligase. Elevated G3BP1 disables Cul3-SPOP activity, promoting AR signaling. AR directly upregulates G3BP1 transcription in a feed-forward manner.","method":"Co-IP of G3BP1-SPOP, competitive inhibition assay, transcriptomic analysis of AR targets, AR ChIP at G3BP1 promoter","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus competitive inhibition assay, transcriptomics, and promoter ChIP; single lab but multiple orthogonal methods","pmids":["34795264"],"is_preprint":false},{"year":2020,"finding":"G3BP1 coordinates lysophagy activity at lysosomes via a G3BP1/TSC2 complex. Dysfunction of the G3BP1/TSC2 complex accelerates lysosomal damage and ferroptosis via mTOR pathway dysregulation.","method":"Co-IP of G3BP1-TSC2, G3BP1 KD in nucleus pulposus cells, lysosomal damage assays, mTOR inhibition rescue, in vivo IDD model","journal":"Cell proliferation","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP with KD phenotype; mechanism linking G3BP1-TSC2 to mTOR and lysophagy is indirect; single lab","pmids":["36450665"],"is_preprint":false},{"year":2023,"finding":"G3BP1 stabilizes IRP2 protein by binding to and suppressing translation of FBXL5 mRNA (encoding the E3 ligase component that ubiquitinates IRP2). This G3BP1-FBXL5-IRP2 axis elevates cellular labile iron and mediates arsenite-induced ferroptotic cell death.","method":"G3BP1 KO cells, RIP for G3BP1-FBXL5 mRNA interaction, polysome profiling, IRP2 stability assays, ferroptosis assays, in vivo kidney injury model","journal":"Journal of hazardous materials","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP, polysome profiling, genetic KO with multiple functional readouts; single lab","pmids":["38118197"],"is_preprint":false},{"year":2021,"finding":"TDP-43 stabilizes G3BP1 transcripts by directly binding a conserved cis regulatory element in the G3BP1 3' UTR. Nuclear TDP-43 depletion is sufficient to reduce G3BP1 protein levels in vitro and in vivo. In ALS/FTD patient neurons with TDP-43 cytoplasmic inclusions/nuclear depletion, G3BP1 transcripts are reduced.","method":"CLIP-seq (TDP-43 binding to G3BP1 3'UTR), mRNA stability assays, conditional TDP-43 KO in vivo, patient neuron analysis","journal":"Brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CLIP-seq for direct binding, in vivo KO model, patient validation; single lab","pmids":["34115105"],"is_preprint":false},{"year":2016,"finding":"Immunopurified G3BP1 complex from mouse brain contains USP10, CtBP1, Caprin-1, G3BP2a, and PSF. This complex preferentially binds intron-retaining transcripts and 3' UTRs. G3BP1 depletion in mouse cerebellum decreases intron retention, including for Grm5 (metabotropic glutamate receptor 5) mRNA.","method":"Immunopurification of G3BP1 complex, CLIP-seq, G3BP1 KO mice with RNA-seq for intron retention","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — complex purification with CLIP-seq and in vivo KO model; single lab","pmids":["27513819"],"is_preprint":false},{"year":2024,"finding":"G3BP1 preferentially binds unfolded RNA and drives assembly of RNP granule-like condensates that establish RNA-RNA interactions. These RNA-RNA interactions limit mobility and translatability of sequestered mRNAs. The DEAD-box helicase DDX3X resolves these RNA-RNA interactions inside condensates, rendering them dynamic and enabling mRNA translation; disease-associated catalytically inactive DDX3X variants fail to resolve RNA-RNA interactions.","method":"In vitro condensate/LLPS reconstitution, RNA mobility assays, translation assays with condensate-sequestered mRNAs, DDX3X WT vs. disease mutants","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of condensates with RNA-RNA interaction measurement, translation assay, multiple disease mutants tested; single lab but multiple orthogonal methods","pmids":["39729994"],"is_preprint":false},{"year":2024,"finding":"G3BP1 promotes intermolecular RNA-RNA interactions that stabilize RNA condensates and is a 'condensate chaperone' for initial granule assembly. After initial condensation, G3BP1 is dispensable for the RNA component of granules to persist in vitro and in cells when RNA decondensers are inactivated, demonstrating that RNA condensates can persist without G3BP1 once formed.","method":"In vitro RNA condensation assays, G3BP1 depletion in cells, inactivation of RNA decondensers (DCP1a, XRN1), FRAP, RNA-only granule persistence assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with multiple genetic manipulations and live imaging; single lab but multiple orthogonal methods","pmids":["39637853"],"is_preprint":false},{"year":2024,"finding":"G3BP1-dependent condensation of viral RNAs (West Nile virus, Zika virus, SARS-CoV-2) antagonizes viral replication by condensing untranslating viral mRNPs. G3BP1-dependent RNA condensation disrupts viral replication organelles and viral RNA replication. G3BP1 does not generally alter innate immune pathway activation. Viruses counteract this by inhibiting G3BP1 RNA condensing activity, hijacking eIF4A decondensing activity, or maintaining efficient translation.","method":"G3BP1 KO cells, viral RNA condensation assays, viral replication organelle imaging, innate immune pathway reporter assays, eIF4A inhibition experiments","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple viruses tested in G3BP1 KO cells with mechanistic dissection of condensation vs immune signaling; single lab","pmids":["38295168"],"is_preprint":false},{"year":2024,"finding":"SARS-CoV-2 nucleocapsid (N) protein interacts with G3BP1/2 via the F17 residue in an ITFG motif. N-F17A mutation causes specific loss of G3BP1/2 interaction, fails to inhibit SG assembly, shows decreased viral replication in cells, and causes decreased pathology in vivo. Mechanistically, the G3BP1-N interaction promotes infection by limiting sequestration of viral genomic RNA into stress granules.","method":"Structure-guided mutagenesis, Co-IP, SG formation assays, viral replication in cells, in vivo mouse infection model","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — structural analysis guiding mutagenesis, biochemical interaction validation, in vivo phenotype confirmation; multiple orthogonal methods","pmids":["38492217"],"is_preprint":false},{"year":2023,"finding":"Gadd45β promotes G3BP1-mediated SG formation by directly interacting with the RNA-binding domain of G3BP1, dissolving G3BP1's autoinhibitory electrostatic intramolecular interaction and inducing conformational expansion. The acidic loop 1 and RNA-binding properties of Gadd45β increase RNA-binding affinity of the G3BP1-Gadd45β complex, promoting SG assembly and RLR-mediated interferon signaling.","method":"Co-IP, FRET/structural analysis of G3BP1 conformation, RNA binding assays, Gadd45β KO mice, viral infection","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conformational analysis plus RNA binding assay, KO mouse phenotype; single lab","pmids":["37917584"],"is_preprint":false},{"year":2021,"finding":"G3BP1 binds guanine quadruplex (rG4) structures in mRNAs directly via its C-terminal RGG domain (enhanced by RRM domain). Pyridostatin (rG4 ligand) displaces G3BP1 from mRNA 3' UTRs in cells. G3BP1 positively regulates mRNA stability through its rG4-binding activity (luciferase reporter assay).","method":"eCLIP-seq bioinformatics, in vitro rG4 binding assay, seCLIP-seq with pyridostatin treatment, luciferase reporter for mRNA stability","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro direct binding with domain mapping and cell-based mRNA stability assay; single lab","pmids":["34614161"],"is_preprint":false},{"year":2023,"finding":"DCAF7 serves as a scaffold protein facilitating interaction between USP10 and G3BP1, leading to removal of K48-linked ubiquitin from Lys76 of G3BP1, preventing its proteasomal degradation and promoting SG-like structure formation and chemoresistance.","method":"Co-IP of DCAF7-USP10-G3BP1 complex, ubiquitination site mapping (K76), SG formation assays, G3BP1 knockdown rescue","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ternary complex Co-IP with ubiquitination site mapping and functional rescue; single lab","pmids":["38973296"],"is_preprint":false},{"year":2023,"finding":"SERBP1 interacts with G3BP1 and recruits 26S proteasome subunits (PSMD10, PSMA3) to SGs. SERBP1 depletion reduces 20S proteasome activity at SGs, mislocalizes VCP/FAF2, and diminishes K63-linked polyubiquitination of G3BP1 during SG recovery, impairing SG clearance.","method":"Co-IP of SERBP1-G3BP1-proteasome complex, proteasome activity assay, ubiquitination assay, SERBP1 KD with SG clearance readout, in vivo heat stress in testes","journal":"Research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP with functional KD phenotype, but mechanistic link between SERBP1-G3BP1 interaction and proteasome recruitment is indirect; single lab","pmids":["37223481"],"is_preprint":false},{"year":2020,"finding":"G3BP1 is required for activation of the senescence-associated secretory phenotype (SASP) by promoting association of cGAS with cytosolic chromatin fragments during senescence. Through cGAS, G3BP1 activates the NF-κB and STAT3 pathways to promote SASP expression. G3BP1 depletion or pharmacological inhibition impairs the cGAS pathway and prevents SASP expression without affecting senescence commitment itself.","method":"G3BP1 KD/inhibition, cGAS-chromatin fragment Co-IP, NF-κB/STAT3 pathway readouts, in vitro and in vivo tumor growth assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of cGAS-chromatin with G3BP1 dependency, pathway readouts, in vivo rescue; single lab","pmids":["33020468"],"is_preprint":false},{"year":2004,"finding":"G3BP-1 and HuD proteins associate in an RNA-dependent manner in differentiated P19 neuronal cells. IMP-1 associates with both HuD and G3BP-1 in an RNA-dependent manner and binds directly to tau mRNA, placing G3BP-1 in a tau mRNA-containing RNP granule complex.","method":"GST-HuD fusion pulldown from P19 cell lysates, Co-IP, RNA-dependent complex analysis, tau mRNA binding assay","journal":"Journal of neurochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pulldown/Co-IP establishing complex membership; RNA-dependence shown but no mechanistic functional consequence for G3BP1 established; single lab","pmids":["15086518"],"is_preprint":false},{"year":2011,"finding":"TDP-43 regulates the levels of G3BP mRNA (a SG nucleating factor). Disease-associated mutation TDP-43(R361S) is a loss-of-function mutation with respect to SG formation and alters G3BP and TIA-1 levels, while TDP-43(D169G) does not impact this pathway.","method":"TDP-43 KD, mRNA level analysis, TDP-43 mutant overexpression, SG formation assays","journal":"Human molecular genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — mRNA level regulation by indirect mechanism (TDP-43 regulates G3BP mRNA); no direct TDP-43-G3BP1 mRNA binding demonstrated in this paper","pmids":["21257637"],"is_preprint":false},{"year":2002,"finding":"Heregulin β1 (HRG) stimulation induces G3BP ATPase activity, promotes its phosphorylation (increasing association with GTPase-activating protein), and causes G3BP translocation to the nucleus where it co-localizes with acetylated histone H3 (active transcription sites). These effects are blocked by the HER2 antibody Herceptin.","method":"ATPase assay, Co-IP (G3BP-GAP), subcellular fractionation/immunofluorescence, Herceptin inhibition","journal":"Cancer research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — ATPase activity and localization assay under mitogenic stimulation; HRG-mediated phosphorylation-localization link shown but mechanism of nuclear function not characterized; single lab","pmids":["11888885"],"is_preprint":false},{"year":2001,"finding":"G3BP promotes S phase entry in serum-deprived fibroblasts. This function is dependent on the presence of the RNA-binding domain of G3BP.","method":"G3BP overexpression in fibroblasts, RNA-binding domain deletion mutant, cell cycle analysis (S phase entry)","journal":"Cancer letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single deletion mutant approach with cell cycle readout; mechanism downstream of RNA-binding is undefined; single lab","pmids":["11146228"],"is_preprint":false},{"year":2023,"finding":"Crystal structure of G3BP1-NTF2 in complex with a Caprin-1-derived short linear motif (SLiM) was solved. Caprin-1 interacts with His-31 and His-62 of G3BP1-NTF2 at a third binding site distinct from those used by USP10. G3BP1-NTF2 is destabilized at acidic pH, an effect counterbalanced better by USP10 than Caprin-1, suggesting pH modulates competitive binding. SG condensates are acidified ~0.5 pH units relative to cytosol.","method":"X-ray crystallography, nano-DSF, biophysical binding assays, ratiometric pH fluorescence imaging in cells","journal":"Open biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus orthogonal biophysical binding assays plus cell imaging; single lab but multiple methods","pmids":["37161291"],"is_preprint":false}],"current_model":"G3BP1 is a central multifunctional RNA-binding protein that acts as the primary nucleating hub for stress granule (SG) assembly: it exists in an auto-inhibited, compact state stabilized by intramolecular electrostatic interactions; upon cellular stress and release of mRNAs from polysomes, free RNA outcompetes these autoinhibitory interactions, triggering a conformational switch and RNA-dependent liquid-liquid phase separation; this propensity is fine-tuned by phosphorylation at Ser149 (by CK2α, inhibiting RNA binding and disassembling granules), asymmetric arginine demethylation in the RGG domain (promoting assembly), lysine-376 acetylation (impairing RNA binding and facilitating disassembly via HDAC6/CBP), and ubiquitination (K63-linked by TRIM21 inhibiting LLPS; K48-linked at K76 removed by USP10/DCAF7); SG disassembly after heat shock additionally requires FAF2/p97-VCP engagement of ubiquitinated G3BP1; G3BP1 also promotes 5'→3' helicase and endoribonuclease (CA-cleavage) activities, recruits PKR and Caprin1 to SGs to activate innate immune signaling, promotes cGAS-DNA complex formation for innate DNA sensing, acts as a co-sensor with RIG-I for viral RNA, and regulates mRNA stability/translation through binding structured 3' UTRs, rG4 structures, and specific transcripts including beta-F1-ATPase and FBXL5 mRNAs."},"narrative":{"mechanistic_narrative":"G3BP1 is the central RNA-binding hub that nucleates stress granule (SG) assembly through RNA-dependent liquid-liquid phase separation (LLPS), and is essential for SG formation downstream of eIF2alpha phosphorylation or eIF4A inhibition [PMID:32302571, PMID:27022092]. In unstressed cells it adopts a compact, auto-inhibited conformation stabilized by intramolecular electrostatic contacts between acidic intrinsically disordered tracts and the arginine-rich region; upon stress, mRNAs released from polysomes outcompete these contacts, triggering a conformational expansion that drives protein-RNA condensation [PMID:32302572]. It functions as a condensate chaperone that promotes intermolecular RNA-RNA interactions to seed granules, after which it becomes dispensable for RNA condensate persistence, while DEAD-box helicase DDX3X resolves these interactions to keep condensates dynamic and translatable [PMID:39729994, PMID:39637853]. G3BP1 condensation behavior is governed by mutually exclusive partners binding its NTF2-like domain — Caprin1 promoting and USP10 inhibiting assembly — and by 40S ribosome engagement through its RGG motif [PMID:27022092, PMID:37161291]. A layered PTM code tunes its activity: CK2alpha phosphorylation at Ser149 disables RNA binding and disassembles granules [PMID:11604510, PMID:33065005], asymmetric arginine demethylation in the RGG domain promotes assembly [PMID:27601476], K376 acetylation by CBP/p300 (reversed by HDAC6) impairs RNA binding to facilitate disassembly [PMID:31481451], and ubiquitination controls granule turnover — K63-linked chains laid by TRIM21 inhibit LLPS while a FAF2/p97-VCP axis and autophagy receptors (p62, NDP52) clear ubiquitinated G3BP1 after stress [PMID:34739333, PMID:36692217]. Beyond SGs, G3BP1 is an endoribonuclease that cleaves at CA dinucleotides and an ATP-dependent 5'->3' helicase, and it controls mRNA fate by binding structured 3' UTRs, rG4 structures, and specific transcripts to regulate decay and translation [PMID:11604510, PMID:9889278, PMID:32017897, PMID:34614161]. In innate immunity it recruits PKR and Caprin1 to activate eIF2alpha phosphorylation and NF-kB/JNK signaling [PMID:25784705, PMID:25520508], promotes cGAS pre-condensation and DNA binding to drive interferon production and the senescence-associated secretory phenotype [PMID:30510222, PMID:34779554, PMID:33020468], and acts with RIG-I as a viral RNA co-sensor [PMID:30804210]. G3BP1-dependent condensation of viral RNAs restricts replication of flaviviruses and SARS-CoV-2, which counter it via viral proteins bearing FGDF or phi-x-F/ITFG motifs that engage the NTF2-like domain [PMID:38295168, PMID:38492217, PMID:25658430]. TDP-43 stabilizes G3BP1 transcripts via its 3' UTR, linking G3BP1 levels to ALS/FTD pathology [PMID:34115105].","teleology":[{"year":1999,"claim":"Establishing G3BP1's earliest assigned enzymatic identity, biochemical purification revealed it is an ATP- and Mg2+-dependent nucleic acid helicase, framing the protein as an active RNA/DNA-remodeling enzyme rather than a passive binder.","evidence":"Purification from HeLa nuclear extract and in vitro helicase assays on partial duplex substrates","pmids":["9889278"],"confidence":"High","gaps":["Physiological substrates of the helicase activity not defined","Relationship of helicase activity to later SG functions unresolved"]},{"year":2001,"claim":"Two foundational studies defined G3BP as a phosphorylation-regulated endoribonuclease (CA-cleavage) whose Ser149 status controls subcellular localization and mRNA stability, and showed its RNA-binding domain drives S-phase entry — establishing a direct link between G3BP and mRNA fate control.","evidence":"In vitro endoribonuclease assays with S149A/S149E mutants, c-myc mRNA stability assays, and RNA-binding-domain deletion in fibroblasts","pmids":["11604510","11146228"],"confidence":"High","gaps":["Catalytic residues of the endoribonuclease not mapped","Downstream targets mediating S-phase entry undefined"]},{"year":2007,"claim":"Defining G3BP1's key protein interfaces, work mapped Caprin-1 binding to the NTF2-like domain via an FGDF-like motif and revealed G3BP1/2 sequestration of p53, beginning the dissection of how partner binding routes G3BP1 between granule and tumor-suppressor pathways.","evidence":"Motif mutagenesis with GST pulldown/Co-IP and subcellular fractionation/ubiquitylation assays","pmids":["17210633","17297477"],"confidence":"High","gaps":["Structural basis of NTF2 motif recognition not yet solved at this stage","Functional consequence of p53 cytoplasmic redistribution in vivo unclear"]},{"year":2012,"claim":"Genetic dissection showed G3BP1/G3BP2 act redundantly to nucleate SGs and that SG size functions as a threshold switch triggering PKR-mediated eIF2alpha phosphorylation, connecting granule assembly to translational control.","evidence":"siRNA double-knockdown, heterodimerization Co-IP, and SG-size quantification in eIF2alpha-kinase-knockout MEFs","pmids":["23279204","22833567"],"confidence":"Medium","gaps":["Molecular basis of the size threshold not defined","G3BP1 vs G3BP2 individual contributions partially overlapping"]},{"year":2015,"claim":"Multiple studies established the NTF2-like domain as the regulatory hub: USP10 and viral FGDF motifs compete there to inhibit assembly, while the PXXP domain recruits PKR to couple SG formation to NF-kB/JNK innate signaling and antiviral defense.","evidence":"FGDF-motif mutagenesis with crystallographic modeling, domain-deletion Co-IP, and viral replication/reporter assays","pmids":["25658430","25784705","25520508","25847539"],"confidence":"High","gaps":["Quantitative competition between Caprin1/USP10/viral motifs not resolved","Mechanism of PKR activation independent of dsRNA incompletely defined"]},{"year":2016,"claim":"Convergent work defined the partner logic and PTM logic of SG control — establishing mutually exclusive Caprin1/USP10 binding, RGG-mediated 40S engagement, and arginine methylation by PRMT1/PRMT5 as a reversible stress-sensitive switch for assembly.","evidence":"CRISPR-KO rescue with defined mutants, ribosome fractionation, methylation-specific antibodies, and PRMT knockdown","pmids":["27022092","27601476","27513819"],"confidence":"High","gaps":["Stoichiometry of competing partner occupancy unknown","Enzymes coupling stress to rapid demethylation not identified"]},{"year":2018,"claim":"Studies expanded G3BP1 into a nucleic-acid sensing hub, showing it promotes cGAS DNA-complex formation for interferon production and co-senses viral dsRNA with RIG-I via its RGG domain.","evidence":"Reciprocal Co-IP, dsRNA pulldown with in vitro translated protein, KO-cell IFN assays, and an in vivo AGS mouse model","pmids":["30510222","30804210"],"confidence":"High","gaps":["How a single RGG domain selects DNA-sensing vs RNA-sensing contexts unclear","Relationship of immune sensing to SG condensation not fully separated"]},{"year":2019,"claim":"PTM and partner mapping refined disassembly and immune control: K376 acetylation (HDAC6/CBP) impairs RNA binding to drive SG resolution, eIF4GI was identified as an essential SG-forming partner, and G3BP1 was shown to stabilize RIG-I via RNF125.","evidence":"Acetyl-mimic mutants with RNA-binding/SG assays, domain-mapping Co-IP, and ubiquitination/viral replication assays","pmids":["31481451","30603102","31827077"],"confidence":"Medium","gaps":["Temporal coordination of acetylation with other disassembly PTMs unresolved","Direct vs indirect effects on RIG-I stability not fully separated"]},{"year":2020,"claim":"Landmark reconstitution studies resolved the core mechanism: G3BP1 is an RNA-dependent LLPS switch held in an auto-inhibited compact state by electrostatic intramolecular contacts that free mRNA outcompetes upon stress, with IDR phosphorylation and cooperative partners tuning the transition.","evidence":"In vitro LLPS reconstitution, FRET/NMR, RNA competition assays, and IDR/phospho-site mutagenesis in two simultaneous Cell papers","pmids":["32302571","32302572"],"confidence":"High","gaps":["In vivo confirmation of the conformational switch under physiological RNA loads incomplete","Quantitative contribution of each IDR to the threshold not isolated"]},{"year":2020,"claim":"Parallel work broadened G3BP1's regulatory and physiological reach — defining its role in structure-mediated mRNA decay with UPF1, cGAS pre-condensation, beta-F1-ATPase translational control, SASP activation, axonal granule control, and germline heat sensitivity via MAGE-B2-controlled abundance.","evidence":"RNA-seq with structured-3'UTR manipulation, cGAS LLPS imaging, TriFC/polysome profiling, and in vivo KO mouse models","pmids":["32017897","34779554","20663914","33020468","30135423","32692974"],"confidence":"Medium","gaps":["Biochemical basis of recruitment to structured RNA not resolved","How a single concentration-threshold protein is tuned across tissues unclear"]},{"year":2021,"claim":"Studies defined the disassembly and turnover machinery and disease coupling: ubiquitinated G3BP1 is engaged by FAF2/p97-VCP for SG disassembly after heat shock, rG4-binding stabilizes target mRNAs, and TDP-43 stabilizes G3BP1 transcripts — tying G3BP1 levels to ALS/FTD.","evidence":"Ubiquitination-site mutants with Co-IP, in vitro rG4 binding with pyridostatin displacement, and TDP-43 CLIP-seq with patient-neuron analysis","pmids":["34739333","34614161","34115105"],"confidence":"Medium","gaps":["E3 ligase generating disassembly-linked ubiquitin not identified at this stage","Causal contribution of G3BP1 loss to neurodegeneration not established"]},{"year":2023,"claim":"The ubiquitin and acetylation circuitry was completed: TRIM21 K63-ubiquitination inhibits LLPS with autophagy receptors clearing SGs, DCAF7/USP10 removes K48 ubiquitin at K76 to stabilize G3BP1, and SIRT2 deacetylation of G3BP1 dismantles the cGAS complex to restrain interferon.","evidence":"E3-ligase screens, in vitro ubiquitination/LLPS and deacetylation assays with site mapping, and KO models","pmids":["36692217","38973296","37870259"],"confidence":"Medium","gaps":["Integration of competing ubiquitin linkages on the same molecule unresolved","Cross-talk between acetylation and ubiquitination codes not mapped"]},{"year":2024,"claim":"Reconstitution work reframed G3BP1 as a transient condensate chaperone that seeds RNA-RNA interactions and then becomes dispensable, with DDX3X and decondensers controlling condensate dynamics, and demonstrated G3BP1-driven viral RNA condensation as a direct antiviral restriction countered by SARS-CoV-2 N protein.","evidence":"In vitro RNA condensate reconstitution with decondenser inactivation, DDX3X disease-mutant assays, and structure-guided N-protein mutagenesis with in vivo infection","pmids":["39729994","39637853","38295168","38492217"],"confidence":"High","gaps":["How decondensers are spatially regulated within granules unclear","Generality of RNA-only persistence across stress types untested"]},{"year":null,"claim":"How the many competing inputs — conformational autoinhibition, the combinatorial PTM code, mutually exclusive NTF2 partners, and condensate-resolving helicases — are integrated quantitatively to set the SG assembly/disassembly threshold in a given cell state remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified quantitative model linking PTMs, partner occupancy, and RNA load to phase behavior","In vivo dynamics of competing regulators across tissues unmeasured"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[2,5,13,17,18,44]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[5,6,30]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[5,6]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[6,50]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,39,40]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[33,34,19]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,2,5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5,50]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,13,44]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,1,2,16]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,9,18,26,47]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,24,45]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[41,42,37]}],"complexes":["stress granule","G3BP1-Caprin1-PKR complex","cGAS-G3BP1 complex","DCAF7-USP10-G3BP1 complex"],"partners":["CAPRIN1","USP10","PKR","CGAS","RIG-I","FAF2","EIF4GI","DDX3X"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13283","full_name":"Ras GTPase-activating protein-binding protein 1","aliases":["ATP-dependent DNA helicase VIII","hDH VIII","GAP SH3 domain-binding protein 1"],"length_aa":466,"mass_kda":52.2,"function":"Protein involved in various processes, such as stress granule formation and innate immunity (PubMed:12642610, PubMed:20180778, PubMed:23279204, PubMed:30510222, PubMed:30804210). Plays an essential role in stress granule formation (PubMed:12642610, PubMed:20180778, PubMed:23279204, PubMed:32302570, PubMed:32302571, PubMed:32302572, PubMed:34739333, PubMed:35977029, PubMed:36183834, PubMed:36279435, PubMed:36692217, PubMed:37379838). Stress granules are membraneless compartments that store mRNAs and proteins, such as stalled translation pre-initiation complexes, in response to stress (PubMed:12642610, PubMed:20180778, PubMed:23279204, PubMed:27022092, PubMed:32302570, PubMed:32302571, PubMed:32302572, PubMed:36279435, PubMed:37379838). Promotes formation of stress granules phase-separated membraneless compartment by undergoing liquid-liquid phase separation (LLPS) upon unfolded RNA-binding: functions as a molecular switch that triggers RNA-dependent LLPS in response to a rise in intracellular free RNA concentrations (PubMed:32302570, PubMed:32302571, PubMed:32302572, PubMed:34739333, PubMed:36279435, PubMed:36692217). Also acts as an ATP- and magnesium-dependent helicase: unwinds DNA/DNA, RNA/DNA, and RNA/RNA substrates with comparable efficiency (PubMed:9889278). Acts unidirectionally by moving in the 5' to 3' direction along the bound single-stranded DNA (PubMed:9889278). Unwinds preferentially partial DNA and RNA duplexes having a 17 bp annealed portion and either a hanging 3' tail or hanging tails at both 5'- and 3'-ends (PubMed:9889278). Plays an essential role in innate immunity by promoting CGAS and RIGI activity (PubMed:30510222, PubMed:30804210). Participates in the DNA-triggered cGAS/STING pathway by promoting the DNA binding and activation of CGAS (PubMed:30510222). Triggers the condensation of cGAS, a process probably linked to the formation of membrane-less organelles (PubMed:34779554). Also enhances RIGI-induced type I interferon production probably by helping RIGI at sensing pathogenic RNA (PubMed:30804210). May also act as a phosphorylation-dependent sequence-specific endoribonuclease in vitro: Cleaves exclusively between cytosine and adenine and cleaves MYC mRNA preferentially at the 3'-UTR (PubMed:11604510)","subcellular_location":"Cytoplasm, cytosol; Perikaryon; Cytoplasm, Stress granule; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q13283/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/G3BP1","classification":"Not Classified","n_dependent_lines":74,"n_total_lines":1208,"dependency_fraction":0.061258278145695365},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000145907","cell_line_id":"CID000065","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":3}],"interactors":[{"gene":"HSPB1","stoichiometry":10.0},{"gene":"RPLP1","stoichiometry":10.0},{"gene":"RPLP2","stoichiometry":10.0},{"gene":"RPS21","stoichiometry":10.0},{"gene":"G3BP2","stoichiometry":10.0},{"gene":"CAPRIN1","stoichiometry":10.0},{"gene":"RPL27","stoichiometry":10.0},{"gene":"RPS28","stoichiometry":10.0},{"gene":"RPL3","stoichiometry":4.0},{"gene":"RPS19","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/target/CID000065","total_profiled":1310},"omim":[{"mim_id":"620059","title":"LONG INTERGENIC NONCODING RNA 472; LINC00472","url":"https://www.omim.org/entry/620059"},{"mim_id":"620020","title":"G3BP STRESS GRANULE ASSEMBLY FACTOR 2; G3BP2","url":"https://www.omim.org/entry/620020"},{"mim_id":"616695","title":"SERINE/THREONINE/TYROSINE-INTERACTING PROTEIN-LIKE 1; STYXL1","url":"https://www.omim.org/entry/616695"},{"mim_id":"616472","title":"UBIQUITIN-ASSOCIATED PROTEIN 2-LIKE; UBAP2L","url":"https://www.omim.org/entry/616472"},{"mim_id":"615857","title":"2-OXOGLUTARATE- AND IRON-DEPENDENT OXYGENASE DOMAIN-CONTAINING PROTEIN 1; OGFOD1","url":"https://www.omim.org/entry/615857"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Cytosol","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/G3BP1"},"hgnc":{"alias_symbol":["HDH-VIII","G3BP"],"prev_symbol":[]},"alphafold":{"accession":"Q13283","domains":[{"cath_id":"3.10.450.50","chopping":"7-138","consensus_level":"high","plddt":95.7113,"start":7,"end":138},{"cath_id":"3.30.70.330","chopping":"337-415","consensus_level":"high","plddt":82.8867,"start":337,"end":415}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13283","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13283-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13283-F1-predicted_aligned_error_v6.png","plddt_mean":66.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=G3BP1","jax_strain_url":"https://www.jax.org/strain/search?query=G3BP1"},"sequence":{"accession":"Q13283","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13283.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13283/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13283"}},"corpus_meta":[{"pmid":"32302571","id":"PMC_32302571","title":"G3BP1 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interferon-stimulated genes: IFITM1, IFITM2 and IFITM3 in the cancer cell line MCF7.","date":"2019","source":"Molecular and cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/31172368","citation_count":22,"is_preprint":false},{"pmid":"35357586","id":"PMC_35357586","title":"Upregulated LINC01088 facilitates malignant phenotypes and immune escape of colorectal cancer by regulating microRNAs/G3BP1/PD-L1 axis.","date":"2022","source":"Journal of cancer research and clinical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/35357586","citation_count":22,"is_preprint":false},{"pmid":"37223481","id":"PMC_37223481","title":"SERBP1 Promotes Stress Granule Clearance by Regulating 26S Proteasome Activity and G3BP1 Ubiquitination and Protects Male Germ Cells from Thermostimuli Damage.","date":"2023","source":"Research (Washington, D.C.)","url":"https://pubmed.ncbi.nlm.nih.gov/37223481","citation_count":21,"is_preprint":false},{"pmid":"31392596","id":"PMC_31392596","title":"G3BP1 knockdown sensitizes U87 glioblastoma cell line to Bortezomib by inhibiting stress granules assembly and potentializing apoptosis.","date":"2019","source":"Journal of neuro-oncology","url":"https://pubmed.ncbi.nlm.nih.gov/31392596","citation_count":21,"is_preprint":false},{"pmid":"33000280","id":"PMC_33000280","title":"Overexpression of G3BP1 facilitates the progression of colon cancer by activating β‑catenin signaling.","date":"2020","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/33000280","citation_count":21,"is_preprint":false},{"pmid":"38118197","id":"PMC_38118197","title":"A regulatory module comprising G3BP1-FBXL5-IRP2 axis determines sodium arsenite-induced ferroptosis.","date":"2023","source":"Journal of hazardous materials","url":"https://pubmed.ncbi.nlm.nih.gov/38118197","citation_count":20,"is_preprint":false},{"pmid":"27513819","id":"PMC_27513819","title":"Preferential binding of a stable G3BP ribonucleoprotein complex to intron-retaining transcripts in mouse brain and modulation of their expression in the cerebellum.","date":"2016","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/27513819","citation_count":20,"is_preprint":false},{"pmid":"35568705","id":"PMC_35568705","title":"CircEIF3H-IGF2BP2-HuR scaffold complex promotes TNBC progression via stabilizing HSPD1/RBM8A/G3BP1 mRNA.","date":"2022","source":"Cell death discovery","url":"https://pubmed.ncbi.nlm.nih.gov/35568705","citation_count":20,"is_preprint":false},{"pmid":"33941659","id":"PMC_33941659","title":"G3BP1 Inhibition Alleviates Intracellular Nucleic Acid-Induced Autoimmune Responses.","date":"2021","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/33941659","citation_count":19,"is_preprint":false},{"pmid":"10404389","id":"PMC_10404389","title":"Upregulation of the RAS-GTPase activating protein (GAP)-binding protein (G3BP) in proliferating RPE cells.","date":"1999","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10404389","citation_count":19,"is_preprint":false},{"pmid":"37917584","id":"PMC_37917584","title":"Gadd45β is critical for regulation of type I interferon signaling by facilitating G3BP-mediated stress granule formation.","date":"2023","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/37917584","citation_count":18,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48183,"output_tokens":13537,"usd":0.173802,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":25384,"output_tokens":5681,"usd":0.134472,"stage2_stop_reason":"end_turn"},"total_usd":0.308274,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2020,\n      \"finding\": \"G3BP1 functions as a molecular switch that triggers RNA-dependent liquid-liquid phase separation (LLPS) to assemble stress granules. Three distinct intrinsically disordered regions (IDRs) regulate its intrinsic propensity for LLPS, and phosphorylation within these IDRs fine-tunes this regulation. Extrinsic G3BP1-binding factors (e.g., Caprin1 promotes, USP10 inhibits) modulate SG assembly through positive or negative cooperativity.\",\n      \"method\": \"In vitro LLPS reconstitution, phase separation assays, mutagenesis of IDRs and phosphorylation sites, RNA-binding experiments\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution of LLPS in vitro with mutagenesis, replicated in companion paper (PMID:32302572)\",\n      \"pmids\": [\"32302571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Under non-stress conditions, G3BP1 adopts a compact auto-inhibited state stabilized by electrostatic intramolecular interactions between intrinsically disordered acidic tracts and the positively charged arginine-rich region. Upon release of mRNAs from polysomes during stress, unfolded mRNAs outcompete G3BP auto-inhibitory interactions, inducing a conformational transition that facilitates G3BP clustering through protein-RNA interactions and drives RNA/protein condensate formation.\",\n      \"method\": \"FRET, NMR, in vitro RNA competition assays, mutagenesis, live-cell imaging\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biophysical methods (FRET, NMR, in vitro assays) with mutagenesis; replicated across two simultaneous papers\",\n      \"pmids\": [\"32302572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"G3BP1 and G3BP2 double knockout abolishes SG formation in response to eIF2α phosphorylation or eIF4A inhibition. Caprin1 binding to G3BP1 promotes SG formation whereas USP10 binding inhibits SG formation; these interactions are mutually exclusive at G3BP1. G3BP1 interacts with 40S ribosomal subunits through its RGG motif, required for SG-mediated condensation. Phosphomimetic G3BP1-S149E fails to rescue SG formation.\",\n      \"method\": \"CRISPR/KO cell lines, rescue with G3BP1 mutants (S149E, F33W), Co-IP, ribosome fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genetic rescue with multiple defined mutants, replicated across labs\",\n      \"pmids\": [\"27022092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Stress granule disassembly after heat shock specifically requires ubiquitination of G3BP1. Ubiquitinated G3BP1 interacts with the ER-associated protein FAF2, which engages the ubiquitin-dependent segregase p97/VCP, targeting the stress granule interaction network for disassembly.\",\n      \"method\": \"Cultured human cells, ubiquitination assays, Co-IP of G3BP1 with FAF2 and p97/VCP, G3BP1 ubiquitination mutants\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of endogenous proteins, ubiquitination site mapping, functional rescue experiments in a single rigorous study\",\n      \"pmids\": [\"34739333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"G3BP1 physically interacts with cGAS and promotes formation of large cGAS complexes that enhance cGAS DNA binding and cGAS-dependent interferon production. G3BP1 deficiency leads to inefficient DNA binding by cGAS. The small molecule EGCG disrupts G3BP1-cGAS complexes and inhibits DNA-triggered cGAS activation.\",\n      \"method\": \"Co-IP, G3BP1 knockdown/KO cells, IFN production assays, in vivo mouse model (AGS)\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, KO cell phenotype, in vivo validation; published in high-impact journal with multiple orthogonal methods\",\n      \"pmids\": [\"30510222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"G3BP is a phosphorylation-dependent endoribonuclease that cleaves between cytosine and adenine (CA) via its C-terminal RRM-type RNA binding motif. Phosphorylation at serine 149 controls its subcellular localization: a S149A mutant remains exclusively cytoplasmic whereas a phosphomimetic S149E mutant translocates to the nucleus. G3BP is tightly associated with c-myc mRNA in mouse embryonic fibroblasts, and c-myc mRNA decay is delayed in RasGAP-deficient fibroblasts lacking properly phosphorylated G3BP.\",\n      \"method\": \"In vitro endoribonuclease assay, RNA binding/cleavage specificity mapping, site-directed mutagenesis (S149A and S149E), subcellular fractionation, mRNA stability assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay with defined cleavage specificity, mutagenesis of catalytic/regulatory residue, functional subcellular localization with consequence\",\n      \"pmids\": [\"11604510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"G3BP1 (HDH VIII) functions as a DNA and RNA helicase with ATP- and Mg2+-dependent activity. It prefers partially unwound 3'-tailed substrates, moves along the bound strand in the 5' to 3' direction, and can unwind partial RNA/DNA and RNA/RNA duplexes. The RGG-box-rich C-terminal domain is analogous to that of other DNA/RNA helicases.\",\n      \"method\": \"Biochemical purification from HeLa nuclear extract, in vitro helicase assay, microsequencing\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution of helicase activity with substrate specificity characterization; single lab but multiple substrates tested\",\n      \"pmids\": [\"9889278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"G3BP1 arginine residues in its RGG domain are asymmetrically dimethylated by PRMT1 and symmetrically methylated by PRMT5. Increased arginine methylation represses SG assembly, while decreased methylation promotes it. Arsenite stress rapidly and reversibly decreases asymmetric arginine methylation on G3BP1, acting as a regulatory signal for SG formation.\",\n      \"method\": \"Methylation-specific antibodies, PRMT1/PRMT5 knockdown/overexpression, in vitro methylation assay, SG formation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical methylation mapping with multiple genetic/pharmacological interventions and functional SG readout; single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"27601476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Caprin-1 interacts with G3BP-1 via a conserved F(M/I/L)Q(D/E)Sx(I/L)D motif in Caprin-1 that binds the NTF2-like domain of G3BP-1. Caprin-1 and G3BP-1 co-localize in cytoplasmic RNA granules. The carboxy-terminal RGG motifs of Caprin-1 selectively bind c-Myc and cyclin D2 mRNAs. Caprin-1-mediated induction of eIF2α phosphorylation requires its mRNA-binding ability.\",\n      \"method\": \"Mutagenesis of Caprin-1 motifs, GST pulldown, co-immunoprecipitation, confocal microscopy, eIF2α phosphorylation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-directed mutagenesis defining binding motif, reciprocal pulldown/Co-IP, multiple functional readouts in one study\",\n      \"pmids\": [\"17210633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"G3BP1 directly interacts with inactive PKR through both the NTF2-like and PXXP domains of G3BP1. Caprin1 also directly interacts with PKR and is required for efficient PKR activation at stress granules and release of active PKR into the cytoplasm. The G3BP1-Caprin1-PKR complex represents a mode of PKR activation independent of dsRNA pattern recognition, and the PXXP domain of G3BP1 is essential for PKR recruitment to SGs, eIF2α phosphorylation, and antiviral activity.\",\n      \"method\": \"Direct binding assays, Co-IP, G3BP1 domain deletion mutants, PKR activation assay (eIF2α phosphorylation), viral infection assays\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction demonstrated with domain mapping, functional validation through PKR activation and antiviral assay; multiple orthogonal methods\",\n      \"pmids\": [\"25784705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Viral proteins (e.g., SFV nsP3) and the cellular protein USP10 inhibit SG assembly via FGDF motifs that bind the NTF2-like domain of G3BP1. Both phenylalanine residues and the glycine in the FGDF motif are essential for binding. A crystal structure model of G3BP1-NTF2 bound to an FGDF-containing peptide was generated, revealing the binding mode.\",\n      \"method\": \"Mutagenesis of FGDF motifs, pulldown, SG formation assays, crystallographic modeling\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural model plus biochemical validation of binding residues and functional SG consequence; multiple viral and cellular proteins tested\",\n      \"pmids\": [\"25658430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The NTF2-like domain of G3BP1 contains a conserved surface groove targeted by SARS-CoV-2 nucleocapsid (N) protein residues 1-25 via a φ-x-F motif. Crystal structure of G3BP1-NTF2 in complex with N1-25 peptide revealed surface complementarity. Mutation of key interaction residues disrupts the G3BP1-N interaction in vitro.\",\n      \"method\": \"X-ray crystallography, isothermal titration calorimetry, mutagenesis, pulldown assays\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with mutagenesis validation and biophysical binding measurements in a single rigorous study\",\n      \"pmids\": [\"35240128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Acetylation of G3BP1 at lysine-376 (K376) within the RRM RNA-binding domain impairs RNA binding and disrupts RNA-dependent interaction with PABP1 (but not RNA-independent interactions with Caprin-1 or USP10). K376 acetylation is regulated by HDAC6 (eraser) and CBP/p300 (writer). Acetylated G3BP1 is detected outside SGs and increases during SG resolution, suggesting it facilitates SG disassembly.\",\n      \"method\": \"Acetylation-mimicking (K376Q) and deacetylation-mimicking (K376R) mutants, RNA binding assays, Co-IP, SG formation/dissolution assays, HDAC6/CBP overexpression and knockdown\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific PTM mapping with functional mutagenesis, identification of writer/eraser enzymes, RNA binding and SG functional readouts\",\n      \"pmids\": [\"31481451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"G3BP1 is required for mRNA decay of transcripts with highly structured 3' UTRs (structure-mediated RNA decay), functioning with UPF1. Depletion of G3BP1 increases steady-state levels of mRNAs with highly structured 3' UTRs and highly structured circular RNAs.\",\n      \"method\": \"RNA-seq, G3BP1 knockdown, 3' UTR structural manipulation, half-life assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide RNA decay analysis with G3BP1 depletion, structural manipulation of 3' UTRs, but mechanism of G3BP1 recruitment to structured RNA not fully resolved biochemically\",\n      \"pmids\": [\"32017897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"G3BP1 directly binds to multiple sequences of the FMDV IRES element via its C-terminal region and interacts directly with polypyrimidine tract-binding protein and eIF4B. G3BP1 reduces local flexibility of the IRES element and negatively regulates both cap-dependent and IRES-dependent translation. G3BP1 is cleaved by FMDV 3C protease at E284.\",\n      \"method\": \"RNA EMSA, in vitro translation assays, Co-IP, FMDV infection with G3BP1 mutants\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro RNA binding and translation assays, protein interaction mapping; single lab\",\n      \"pmids\": [\"28755480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"G3BP2 forms homo-multimers and hetero-multimers with G3BP1. Double knockdown of G3BP1 and G3BP2 significantly reduces SG formation, whereas single knockdown of either partially reduces it. Overexpression of G3BP2 alone can induce SGs without stress, similar to G3BP1.\",\n      \"method\": \"siRNA knockdown, Co-IP for heterodimerization, SG formation assays (arsenite, hypoxia, heat shock)\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for interaction, genetic KD for function; single lab, two orthogonal methods\",\n      \"pmids\": [\"23279204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Assembly of large G3BP-induced stress granules (but not small granules) precedes and triggers eIF2α phosphorylation via PKR. Stress granule size acts as a threshold switch for PKR-mediated eIF2α phosphorylation and translational repression.\",\n      \"method\": \"G3BP overexpression, MEF cells with eIF2α kinase knockouts, PKR-specific inhibition, eIF2α phosphorylation assays, SG size quantification\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic dissection with kinase KO MEFs plus functional readout; single lab\",\n      \"pmids\": [\"22833567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"G3BP1 directly interacts with the 3' UTR of beta-F1-ATPase mRNA via its RRM domain (confirmed by RNA-bridged trimolecular fluorescence complementation). G3BP1 interaction with beta-F1 mRNA inhibits its translation at the initiation level. This RNP complex localizes to the periphery of mitochondria.\",\n      \"method\": \"Affinity chromatography, Co-IP, RNA FISH, TriFC assay, polysome profiling, immunoelectron microscopy\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods for interaction (pulldown, TriFC, FISH) and translational readout; single lab\",\n      \"pmids\": [\"20663914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"G3BP1 binds to RIG-I via its C-terminal RGG domain and directly binds viral dsRNA/poly(I:C) also via the RGG domain. G3BP1 overexpression enhances RIG-I-induced IFN-β production, and G3BP1 co-localizes with RIG-I and infecting VSV in cells.\",\n      \"method\": \"Co-IP, biotin-labeled dsRNA pulldown, in vitro translated G3BP1 binding assay, confocal microscopy, IFN-β reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding to dsRNA and RIG-I shown by pulldown with in vitro translated protein; functional IFN readout; single lab\",\n      \"pmids\": [\"30804210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"G3BP1 forms a complex with RNF125 and RIG-I; this interaction leads to auto-ubiquitination of RNF125 and thereby reduced RNF125-mediated degradation of RIG-I, promoting RIG-I expression and antiviral signaling.\",\n      \"method\": \"Co-IP of G3BP1-RNF125-RIG-I complex, ubiquitination assays, G3BP1 KO cells, viral replication assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of endogenous complex, ubiquitination assay; single lab\",\n      \"pmids\": [\"31827077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"G3BP1 recruits PKR to stress granules via its PXXP domain. The G3BP1-SG-PKR axis links SG formation to innate immune transcriptional responses through NF-κB and JNK. Truncated G3BP1 unable to form SGs lacks antiviral activity against enteroviruses.\",\n      \"method\": \"G3BP1 domain deletion mutants, SG formation assays, PKR Co-IP, NF-κB/JNK reporter assays, viral replication assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with functional readouts, Co-IP; single lab\",\n      \"pmids\": [\"25520508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"G3BP1 depletion or its upstream regulator TDP-43 disturbs normal interactions between stress granules and processing bodies (PBs), reducing SG-PB docking and impairing preservation of polyadenylated mRNA. Reintroduction of G3BP1 alone rescues SG-PB interactions and mRNA preservation.\",\n      \"method\": \"G3BP1 siRNA, TDP-43 siRNA, live-cell imaging of SG-PB interactions, mRNA stability assays, G3BP1 rescue experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rescue experiment with G3BP1 alone establishing sufficiency; multiple cell types; single lab\",\n      \"pmids\": [\"25847539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In axons, G3BP1 forms stress granule-like structures that co-localize with stored axonal mRNAs and limit their translation. Upon axotomy, G3BP1 granules disassemble (associated with increased phospho-G3BP1), releasing mRNAs for local translation to support axon regeneration. Dominant-negative G3BP disrupts axonal SG-like structures, activates intra-axonal translation, increases axon growth, and accelerates nerve regeneration in vivo.\",\n      \"method\": \"Dominant-negative G3BP overexpression, G3BP1 co-localization with axonal mRNAs by FISH, phospho-G3BP1 immunostaining, nerve regeneration in rat in vivo model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo nerve regeneration model with functional readout, dominant-negative approach; single lab\",\n      \"pmids\": [\"30135423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CK2α phosphorylates G3BP1 at Ser149 in axons after injury. Phosphomimetic G3BP1 shows markedly decreased RNA binding in neurons compared to wild-type and non-phosphorylatable G3BP1, releasing axonal mRNAs for translation. CK2α translation itself is regulated by local mTOR-dependent translation and axoplasmic Ca2+ levels.\",\n      \"method\": \"In vitro kinase assay, phosphomimetic/non-phosphorylatable G3BP1 mutants, RNA binding assay, dual FRAP reporter for axonal translation, CK2α mRNA depletion from axons\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase assay plus phosphomimetic RNA-binding assay; functional axonal translation measured by FRAP; single lab\",\n      \"pmids\": [\"33065005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM21 E3 ubiquitin ligase catalyzes K63-linked ubiquitination of G3BP1, which inhibits G3BP1 LLPS in vitro and promotes SG dissolution. Autophagy receptors SQSTM1/p62 and CALCOCO2/NDP52 directly interact with G3BP1 at SG periphery to mediate SG elimination via autophagy.\",\n      \"method\": \"E3 ligase screen, in vitro ubiquitination assay, LLPS assay with ubiquitinated G3BP1, Co-IP of G3BP1 with p62/NDP52, SG formation/elimination assays in KO cells\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro ubiquitination and LLPS assay, genetic KO of receptors with functional SG readout; single lab\",\n      \"pmids\": [\"36692217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SIRT2 deacetylates G3BP1 at K257, K276, and K376, leading to disassembly of the cGAS-G3BP1 complex, thereby inhibiting cGAS DNA binding, cGAS droplet formation, and type I IFN production. SIRT2 deficiency elevates IFN expression after HSV-1 infection.\",\n      \"method\": \"Co-IP of SIRT2-G3BP1, in vitro deacetylation assay, acetylation site mapping, cGAS-G3BP1 complex disruption assay, cGAS DNA binding and LLPS assays, SIRT2 KO mouse model\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct deacetylation assay with site mapping, functional cGAS assays, in vivo validation; single lab\",\n      \"pmids\": [\"37870259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"G3BP1 promotes pre-condensation of cGAS into a primary liquid-phase state in resting cells, enabling more efficient DNA-induced LLPS and rapid cGAS activation. RNA does not activate cGAS and upon DNA challenge, G3BP1 dissociates from cGAS, allowing full cGAS-DNA condensation.\",\n      \"method\": \"High-resolution microscopy, G3BP1 KO cells, cGAS LLPS assays, G3BP1 inhibition, DNA vs. RNA stimulation experiments\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging of cGAS condensates with G3BP1 KO, LLPS functional assay; single lab\",\n      \"pmids\": [\"34779554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MAGE-B2 suppresses SG formation by reducing G3BP1 protein levels below the critical concentration for phase separation through translational inhibition of G3BP1. Knockout of the MAGE-B2 mouse ortholog or overexpression of G3BP1 confers hypersensitivity of the male germline to heat stress in vivo.\",\n      \"method\": \"MAGE-B2 KO mice, G3BP1 overexpression in vivo, polysome profiling (translational inhibition), SG formation assays, heat stress survival\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO in vivo with functional germline phenotype, polysome profiling for translational mechanism; single lab\",\n      \"pmids\": [\"32692974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MK-STYX (a pseudophosphatase) interacts with G3BP1 and inhibits G3BP1-induced SG formation. The catalytically active mutant of MK-STYX shows dramatically reduced G3BP1 binding and impaired ability to inhibit SG assembly, indicating the inactive phosphatase conformation is required for G3BP1 interaction.\",\n      \"method\": \"Mass spectrometry identification, Co-IP, G3BP1-induced SG formation assays with MK-STYX wild-type and active-site mutant\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS identification of interaction partner, Co-IP validation, mutagenesis showing conformation-dependence; single lab\",\n      \"pmids\": [\"20180778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"G3BP1 and G3BP2 bind to p53 in vitro and in vivo. G3BP1/2 expression leads to redistribution of p53 from the nucleus to the cytoplasm. G3BP2 (but not G3BP1) additionally associates with MDM2, stabilizes MDM2, and reduces MDM2-mediated p53 ubiquitylation and degradation.\",\n      \"method\": \"Proteomic pulldown, Co-IP in cells, subcellular fractionation, ubiquitylation assay, shRNA knockdown\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with fractionation, ubiquitylation assay; single lab, distinguishes G3BP1 vs G3BP2 effects\",\n      \"pmids\": [\"17297477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"G3BP binds to BART mRNA and degrades it via its endoribonuclease activity. Intracellular CD24 interacts with G3BP in stress granules and inhibits G3BP's specific endoribonuclease activity toward BART mRNA, leading to increased BART expression and reduced cell invasion.\",\n      \"method\": \"Co-IP of CD24-G3BP complex, mRNA stability/RNase assays, CD24 knockdown, in vivo orthotopic xenograft model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA binding and endoribonuclease activity assay with CD24 competition, in vivo validation; single lab\",\n      \"pmids\": [\"21266361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PRMT8 methylates G3BP1 (the dendritic RNA-binding protein) at arginine residues and suppresses Rac1-PAK1 signaling to control actin cytoskeleton dynamics for dendritic spine maturation. PRMT8 depletion leads to overabundance of filopodia and mis-localization of excitatory synapses.\",\n      \"method\": \"PRMT8 KD in neurons, co-IP of PRMT8-G3BP1, in vitro methylation assay, Rac1-PAK1 activity assay, spine morphology imaging\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct methylation assay, defined signaling pathway suppression, dendritic spine phenotype; single lab\",\n      \"pmids\": [\"32521269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"eIF4GI is critical for canonical SG formation by directly interacting with G3BP via amino acids 182-203 of eIF4GI and the RNA-binding domain of G3BP. Picornavirus 2A or L proteases block SG formation by disrupting eIF4GI-G3BP1 interaction.\",\n      \"method\": \"Co-IP, domain deletion mapping, rescue of SG formation by eIF4GI, 2A/L protease cleavage assay\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, functional rescue, viral protease disruption; single lab\",\n      \"pmids\": [\"30603102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"G3BP1 interacts with and inactivates GSK-3β (via Co-IP), suppressing GSK-3β-mediated β-catenin phosphorylation and degradation. Elevated G3BP1 stabilizes β-catenin by inhibiting its ubiquitin-proteasome degradation, promoting nuclear accumulation of β-catenin and cell proliferation.\",\n      \"method\": \"Co-IP of G3BP1-GSK-3β, β-catenin ubiquitination assay, pharmacological disruption of G3BP1-GSK-3β interaction, G3BP1 overexpression/knockdown\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP with pharmacological disruption; mechanism of GSK-3β inactivation not biochemically resolved; single lab\",\n      \"pmids\": [\"33536604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"G3BP1 interacts with SPOP and functions as a competitive inhibitor of the Cul3-SPOP E3 ubiquitin ligase. Elevated G3BP1 disables Cul3-SPOP activity, promoting AR signaling. AR directly upregulates G3BP1 transcription in a feed-forward manner.\",\n      \"method\": \"Co-IP of G3BP1-SPOP, competitive inhibition assay, transcriptomic analysis of AR targets, AR ChIP at G3BP1 promoter\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus competitive inhibition assay, transcriptomics, and promoter ChIP; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"34795264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"G3BP1 coordinates lysophagy activity at lysosomes via a G3BP1/TSC2 complex. Dysfunction of the G3BP1/TSC2 complex accelerates lysosomal damage and ferroptosis via mTOR pathway dysregulation.\",\n      \"method\": \"Co-IP of G3BP1-TSC2, G3BP1 KD in nucleus pulposus cells, lysosomal damage assays, mTOR inhibition rescue, in vivo IDD model\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP with KD phenotype; mechanism linking G3BP1-TSC2 to mTOR and lysophagy is indirect; single lab\",\n      \"pmids\": [\"36450665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"G3BP1 stabilizes IRP2 protein by binding to and suppressing translation of FBXL5 mRNA (encoding the E3 ligase component that ubiquitinates IRP2). This G3BP1-FBXL5-IRP2 axis elevates cellular labile iron and mediates arsenite-induced ferroptotic cell death.\",\n      \"method\": \"G3BP1 KO cells, RIP for G3BP1-FBXL5 mRNA interaction, polysome profiling, IRP2 stability assays, ferroptosis assays, in vivo kidney injury model\",\n      \"journal\": \"Journal of hazardous materials\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP, polysome profiling, genetic KO with multiple functional readouts; single lab\",\n      \"pmids\": [\"38118197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TDP-43 stabilizes G3BP1 transcripts by directly binding a conserved cis regulatory element in the G3BP1 3' UTR. Nuclear TDP-43 depletion is sufficient to reduce G3BP1 protein levels in vitro and in vivo. In ALS/FTD patient neurons with TDP-43 cytoplasmic inclusions/nuclear depletion, G3BP1 transcripts are reduced.\",\n      \"method\": \"CLIP-seq (TDP-43 binding to G3BP1 3'UTR), mRNA stability assays, conditional TDP-43 KO in vivo, patient neuron analysis\",\n      \"journal\": \"Brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CLIP-seq for direct binding, in vivo KO model, patient validation; single lab\",\n      \"pmids\": [\"34115105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Immunopurified G3BP1 complex from mouse brain contains USP10, CtBP1, Caprin-1, G3BP2a, and PSF. This complex preferentially binds intron-retaining transcripts and 3' UTRs. G3BP1 depletion in mouse cerebellum decreases intron retention, including for Grm5 (metabotropic glutamate receptor 5) mRNA.\",\n      \"method\": \"Immunopurification of G3BP1 complex, CLIP-seq, G3BP1 KO mice with RNA-seq for intron retention\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — complex purification with CLIP-seq and in vivo KO model; single lab\",\n      \"pmids\": [\"27513819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"G3BP1 preferentially binds unfolded RNA and drives assembly of RNP granule-like condensates that establish RNA-RNA interactions. These RNA-RNA interactions limit mobility and translatability of sequestered mRNAs. The DEAD-box helicase DDX3X resolves these RNA-RNA interactions inside condensates, rendering them dynamic and enabling mRNA translation; disease-associated catalytically inactive DDX3X variants fail to resolve RNA-RNA interactions.\",\n      \"method\": \"In vitro condensate/LLPS reconstitution, RNA mobility assays, translation assays with condensate-sequestered mRNAs, DDX3X WT vs. disease mutants\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of condensates with RNA-RNA interaction measurement, translation assay, multiple disease mutants tested; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"39729994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"G3BP1 promotes intermolecular RNA-RNA interactions that stabilize RNA condensates and is a 'condensate chaperone' for initial granule assembly. After initial condensation, G3BP1 is dispensable for the RNA component of granules to persist in vitro and in cells when RNA decondensers are inactivated, demonstrating that RNA condensates can persist without G3BP1 once formed.\",\n      \"method\": \"In vitro RNA condensation assays, G3BP1 depletion in cells, inactivation of RNA decondensers (DCP1a, XRN1), FRAP, RNA-only granule persistence assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with multiple genetic manipulations and live imaging; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"39637853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"G3BP1-dependent condensation of viral RNAs (West Nile virus, Zika virus, SARS-CoV-2) antagonizes viral replication by condensing untranslating viral mRNPs. G3BP1-dependent RNA condensation disrupts viral replication organelles and viral RNA replication. G3BP1 does not generally alter innate immune pathway activation. Viruses counteract this by inhibiting G3BP1 RNA condensing activity, hijacking eIF4A decondensing activity, or maintaining efficient translation.\",\n      \"method\": \"G3BP1 KO cells, viral RNA condensation assays, viral replication organelle imaging, innate immune pathway reporter assays, eIF4A inhibition experiments\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple viruses tested in G3BP1 KO cells with mechanistic dissection of condensation vs immune signaling; single lab\",\n      \"pmids\": [\"38295168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SARS-CoV-2 nucleocapsid (N) protein interacts with G3BP1/2 via the F17 residue in an ITFG motif. N-F17A mutation causes specific loss of G3BP1/2 interaction, fails to inhibit SG assembly, shows decreased viral replication in cells, and causes decreased pathology in vivo. Mechanistically, the G3BP1-N interaction promotes infection by limiting sequestration of viral genomic RNA into stress granules.\",\n      \"method\": \"Structure-guided mutagenesis, Co-IP, SG formation assays, viral replication in cells, in vivo mouse infection model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — structural analysis guiding mutagenesis, biochemical interaction validation, in vivo phenotype confirmation; multiple orthogonal methods\",\n      \"pmids\": [\"38492217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Gadd45β promotes G3BP1-mediated SG formation by directly interacting with the RNA-binding domain of G3BP1, dissolving G3BP1's autoinhibitory electrostatic intramolecular interaction and inducing conformational expansion. The acidic loop 1 and RNA-binding properties of Gadd45β increase RNA-binding affinity of the G3BP1-Gadd45β complex, promoting SG assembly and RLR-mediated interferon signaling.\",\n      \"method\": \"Co-IP, FRET/structural analysis of G3BP1 conformation, RNA binding assays, Gadd45β KO mice, viral infection\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conformational analysis plus RNA binding assay, KO mouse phenotype; single lab\",\n      \"pmids\": [\"37917584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"G3BP1 binds guanine quadruplex (rG4) structures in mRNAs directly via its C-terminal RGG domain (enhanced by RRM domain). Pyridostatin (rG4 ligand) displaces G3BP1 from mRNA 3' UTRs in cells. G3BP1 positively regulates mRNA stability through its rG4-binding activity (luciferase reporter assay).\",\n      \"method\": \"eCLIP-seq bioinformatics, in vitro rG4 binding assay, seCLIP-seq with pyridostatin treatment, luciferase reporter for mRNA stability\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro direct binding with domain mapping and cell-based mRNA stability assay; single lab\",\n      \"pmids\": [\"34614161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DCAF7 serves as a scaffold protein facilitating interaction between USP10 and G3BP1, leading to removal of K48-linked ubiquitin from Lys76 of G3BP1, preventing its proteasomal degradation and promoting SG-like structure formation and chemoresistance.\",\n      \"method\": \"Co-IP of DCAF7-USP10-G3BP1 complex, ubiquitination site mapping (K76), SG formation assays, G3BP1 knockdown rescue\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ternary complex Co-IP with ubiquitination site mapping and functional rescue; single lab\",\n      \"pmids\": [\"38973296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SERBP1 interacts with G3BP1 and recruits 26S proteasome subunits (PSMD10, PSMA3) to SGs. SERBP1 depletion reduces 20S proteasome activity at SGs, mislocalizes VCP/FAF2, and diminishes K63-linked polyubiquitination of G3BP1 during SG recovery, impairing SG clearance.\",\n      \"method\": \"Co-IP of SERBP1-G3BP1-proteasome complex, proteasome activity assay, ubiquitination assay, SERBP1 KD with SG clearance readout, in vivo heat stress in testes\",\n      \"journal\": \"Research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP with functional KD phenotype, but mechanistic link between SERBP1-G3BP1 interaction and proteasome recruitment is indirect; single lab\",\n      \"pmids\": [\"37223481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"G3BP1 is required for activation of the senescence-associated secretory phenotype (SASP) by promoting association of cGAS with cytosolic chromatin fragments during senescence. Through cGAS, G3BP1 activates the NF-κB and STAT3 pathways to promote SASP expression. G3BP1 depletion or pharmacological inhibition impairs the cGAS pathway and prevents SASP expression without affecting senescence commitment itself.\",\n      \"method\": \"G3BP1 KD/inhibition, cGAS-chromatin fragment Co-IP, NF-κB/STAT3 pathway readouts, in vitro and in vivo tumor growth assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of cGAS-chromatin with G3BP1 dependency, pathway readouts, in vivo rescue; single lab\",\n      \"pmids\": [\"33020468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"G3BP-1 and HuD proteins associate in an RNA-dependent manner in differentiated P19 neuronal cells. IMP-1 associates with both HuD and G3BP-1 in an RNA-dependent manner and binds directly to tau mRNA, placing G3BP-1 in a tau mRNA-containing RNP granule complex.\",\n      \"method\": \"GST-HuD fusion pulldown from P19 cell lysates, Co-IP, RNA-dependent complex analysis, tau mRNA binding assay\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pulldown/Co-IP establishing complex membership; RNA-dependence shown but no mechanistic functional consequence for G3BP1 established; single lab\",\n      \"pmids\": [\"15086518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TDP-43 regulates the levels of G3BP mRNA (a SG nucleating factor). Disease-associated mutation TDP-43(R361S) is a loss-of-function mutation with respect to SG formation and alters G3BP and TIA-1 levels, while TDP-43(D169G) does not impact this pathway.\",\n      \"method\": \"TDP-43 KD, mRNA level analysis, TDP-43 mutant overexpression, SG formation assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — mRNA level regulation by indirect mechanism (TDP-43 regulates G3BP mRNA); no direct TDP-43-G3BP1 mRNA binding demonstrated in this paper\",\n      \"pmids\": [\"21257637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Heregulin β1 (HRG) stimulation induces G3BP ATPase activity, promotes its phosphorylation (increasing association with GTPase-activating protein), and causes G3BP translocation to the nucleus where it co-localizes with acetylated histone H3 (active transcription sites). These effects are blocked by the HER2 antibody Herceptin.\",\n      \"method\": \"ATPase assay, Co-IP (G3BP-GAP), subcellular fractionation/immunofluorescence, Herceptin inhibition\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — ATPase activity and localization assay under mitogenic stimulation; HRG-mediated phosphorylation-localization link shown but mechanism of nuclear function not characterized; single lab\",\n      \"pmids\": [\"11888885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"G3BP promotes S phase entry in serum-deprived fibroblasts. This function is dependent on the presence of the RNA-binding domain of G3BP.\",\n      \"method\": \"G3BP overexpression in fibroblasts, RNA-binding domain deletion mutant, cell cycle analysis (S phase entry)\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single deletion mutant approach with cell cycle readout; mechanism downstream of RNA-binding is undefined; single lab\",\n      \"pmids\": [\"11146228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Crystal structure of G3BP1-NTF2 in complex with a Caprin-1-derived short linear motif (SLiM) was solved. Caprin-1 interacts with His-31 and His-62 of G3BP1-NTF2 at a third binding site distinct from those used by USP10. G3BP1-NTF2 is destabilized at acidic pH, an effect counterbalanced better by USP10 than Caprin-1, suggesting pH modulates competitive binding. SG condensates are acidified ~0.5 pH units relative to cytosol.\",\n      \"method\": \"X-ray crystallography, nano-DSF, biophysical binding assays, ratiometric pH fluorescence imaging in cells\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus orthogonal biophysical binding assays plus cell imaging; single lab but multiple methods\",\n      \"pmids\": [\"37161291\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"G3BP1 is a central multifunctional RNA-binding protein that acts as the primary nucleating hub for stress granule (SG) assembly: it exists in an auto-inhibited, compact state stabilized by intramolecular electrostatic interactions; upon cellular stress and release of mRNAs from polysomes, free RNA outcompetes these autoinhibitory interactions, triggering a conformational switch and RNA-dependent liquid-liquid phase separation; this propensity is fine-tuned by phosphorylation at Ser149 (by CK2α, inhibiting RNA binding and disassembling granules), asymmetric arginine demethylation in the RGG domain (promoting assembly), lysine-376 acetylation (impairing RNA binding and facilitating disassembly via HDAC6/CBP), and ubiquitination (K63-linked by TRIM21 inhibiting LLPS; K48-linked at K76 removed by USP10/DCAF7); SG disassembly after heat shock additionally requires FAF2/p97-VCP engagement of ubiquitinated G3BP1; G3BP1 also promotes 5'→3' helicase and endoribonuclease (CA-cleavage) activities, recruits PKR and Caprin1 to SGs to activate innate immune signaling, promotes cGAS-DNA complex formation for innate DNA sensing, acts as a co-sensor with RIG-I for viral RNA, and regulates mRNA stability/translation through binding structured 3' UTRs, rG4 structures, and specific transcripts including beta-F1-ATPase and FBXL5 mRNAs.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"G3BP1 is the central RNA-binding hub that nucleates stress granule (SG) assembly through RNA-dependent liquid-liquid phase separation (LLPS), and is essential for SG formation downstream of eIF2alpha phosphorylation or eIF4A inhibition [#0, #2]. In unstressed cells it adopts a compact, auto-inhibited conformation stabilized by intramolecular electrostatic contacts between acidic intrinsically disordered tracts and the arginine-rich region; upon stress, mRNAs released from polysomes outcompete these contacts, triggering a conformational expansion that drives protein-RNA condensation [#1]. It functions as a condensate chaperone that promotes intermolecular RNA-RNA interactions to seed granules, after which it becomes dispensable for RNA condensate persistence, while DEAD-box helicase DDX3X resolves these interactions to keep condensates dynamic and translatable [#39, #40]. G3BP1 condensation behavior is governed by mutually exclusive partners binding its NTF2-like domain — Caprin1 promoting and USP10 inhibiting assembly — and by 40S ribosome engagement through its RGG motif [#2, #52]. A layered PTM code tunes its activity: CK2alpha phosphorylation at Ser149 disables RNA binding and disassembles granules [#5, #23], asymmetric arginine demethylation in the RGG domain promotes assembly [#7], K376 acetylation by CBP/p300 (reversed by HDAC6) impairs RNA binding to facilitate disassembly [#12], and ubiquitination controls granule turnover — K63-linked chains laid by TRIM21 inhibit LLPS while a FAF2/p97-VCP axis and autophagy receptors (p62, NDP52) clear ubiquitinated G3BP1 after stress [#3, #24]. Beyond SGs, G3BP1 is an endoribonuclease that cleaves at CA dinucleotides and an ATP-dependent 5'->3' helicase, and it controls mRNA fate by binding structured 3' UTRs, rG4 structures, and specific transcripts to regulate decay and translation [#5, #6, #13, #44]. In innate immunity it recruits PKR and Caprin1 to activate eIF2alpha phosphorylation and NF-kB/JNK signaling [#9, #20], promotes cGAS pre-condensation and DNA binding to drive interferon production and the senescence-associated secretory phenotype [#4, #26, #47], and acts with RIG-I as a viral RNA co-sensor [#18]. G3BP1-dependent condensation of viral RNAs restricts replication of flaviviruses and SARS-CoV-2, which counter it via viral proteins bearing FGDF or phi-x-F/ITFG motifs that engage the NTF2-like domain [#41, #42, #10]. TDP-43 stabilizes G3BP1 transcripts via its 3' UTR, linking G3BP1 levels to ALS/FTD pathology [#37].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing G3BP1's earliest assigned enzymatic identity, biochemical purification revealed it is an ATP- and Mg2+-dependent nucleic acid helicase, framing the protein as an active RNA/DNA-remodeling enzyme rather than a passive binder.\",\n      \"evidence\": \"Purification from HeLa nuclear extract and in vitro helicase assays on partial duplex substrates\",\n      \"pmids\": [\"9889278\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological substrates of the helicase activity not defined\", \"Relationship of helicase activity to later SG functions unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Two foundational studies defined G3BP as a phosphorylation-regulated endoribonuclease (CA-cleavage) whose Ser149 status controls subcellular localization and mRNA stability, and showed its RNA-binding domain drives S-phase entry — establishing a direct link between G3BP and mRNA fate control.\",\n      \"evidence\": \"In vitro endoribonuclease assays with S149A/S149E mutants, c-myc mRNA stability assays, and RNA-binding-domain deletion in fibroblasts\",\n      \"pmids\": [\"11604510\", \"11146228\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic residues of the endoribonuclease not mapped\", \"Downstream targets mediating S-phase entry undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defining G3BP1's key protein interfaces, work mapped Caprin-1 binding to the NTF2-like domain via an FGDF-like motif and revealed G3BP1/2 sequestration of p53, beginning the dissection of how partner binding routes G3BP1 between granule and tumor-suppressor pathways.\",\n      \"evidence\": \"Motif mutagenesis with GST pulldown/Co-IP and subcellular fractionation/ubiquitylation assays\",\n      \"pmids\": [\"17210633\", \"17297477\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of NTF2 motif recognition not yet solved at this stage\", \"Functional consequence of p53 cytoplasmic redistribution in vivo unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Genetic dissection showed G3BP1/G3BP2 act redundantly to nucleate SGs and that SG size functions as a threshold switch triggering PKR-mediated eIF2alpha phosphorylation, connecting granule assembly to translational control.\",\n      \"evidence\": \"siRNA double-knockdown, heterodimerization Co-IP, and SG-size quantification in eIF2alpha-kinase-knockout MEFs\",\n      \"pmids\": [\"23279204\", \"22833567\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the size threshold not defined\", \"G3BP1 vs G3BP2 individual contributions partially overlapping\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Multiple studies established the NTF2-like domain as the regulatory hub: USP10 and viral FGDF motifs compete there to inhibit assembly, while the PXXP domain recruits PKR to couple SG formation to NF-kB/JNK innate signaling and antiviral defense.\",\n      \"evidence\": \"FGDF-motif mutagenesis with crystallographic modeling, domain-deletion Co-IP, and viral replication/reporter assays\",\n      \"pmids\": [\"25658430\", \"25784705\", \"25520508\", \"25847539\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative competition between Caprin1/USP10/viral motifs not resolved\", \"Mechanism of PKR activation independent of dsRNA incompletely defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Convergent work defined the partner logic and PTM logic of SG control — establishing mutually exclusive Caprin1/USP10 binding, RGG-mediated 40S engagement, and arginine methylation by PRMT1/PRMT5 as a reversible stress-sensitive switch for assembly.\",\n      \"evidence\": \"CRISPR-KO rescue with defined mutants, ribosome fractionation, methylation-specific antibodies, and PRMT knockdown\",\n      \"pmids\": [\"27022092\", \"27601476\", \"27513819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of competing partner occupancy unknown\", \"Enzymes coupling stress to rapid demethylation not identified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Studies expanded G3BP1 into a nucleic-acid sensing hub, showing it promotes cGAS DNA-complex formation for interferon production and co-senses viral dsRNA with RIG-I via its RGG domain.\",\n      \"evidence\": \"Reciprocal Co-IP, dsRNA pulldown with in vitro translated protein, KO-cell IFN assays, and an in vivo AGS mouse model\",\n      \"pmids\": [\"30510222\", \"30804210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single RGG domain selects DNA-sensing vs RNA-sensing contexts unclear\", \"Relationship of immune sensing to SG condensation not fully separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"PTM and partner mapping refined disassembly and immune control: K376 acetylation (HDAC6/CBP) impairs RNA binding to drive SG resolution, eIF4GI was identified as an essential SG-forming partner, and G3BP1 was shown to stabilize RIG-I via RNF125.\",\n      \"evidence\": \"Acetyl-mimic mutants with RNA-binding/SG assays, domain-mapping Co-IP, and ubiquitination/viral replication assays\",\n      \"pmids\": [\"31481451\", \"30603102\", \"31827077\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Temporal coordination of acetylation with other disassembly PTMs unresolved\", \"Direct vs indirect effects on RIG-I stability not fully separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Landmark reconstitution studies resolved the core mechanism: G3BP1 is an RNA-dependent LLPS switch held in an auto-inhibited compact state by electrostatic intramolecular contacts that free mRNA outcompetes upon stress, with IDR phosphorylation and cooperative partners tuning the transition.\",\n      \"evidence\": \"In vitro LLPS reconstitution, FRET/NMR, RNA competition assays, and IDR/phospho-site mutagenesis in two simultaneous Cell papers\",\n      \"pmids\": [\"32302571\", \"32302572\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo confirmation of the conformational switch under physiological RNA loads incomplete\", \"Quantitative contribution of each IDR to the threshold not isolated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Parallel work broadened G3BP1's regulatory and physiological reach — defining its role in structure-mediated mRNA decay with UPF1, cGAS pre-condensation, beta-F1-ATPase translational control, SASP activation, axonal granule control, and germline heat sensitivity via MAGE-B2-controlled abundance.\",\n      \"evidence\": \"RNA-seq with structured-3'UTR manipulation, cGAS LLPS imaging, TriFC/polysome profiling, and in vivo KO mouse models\",\n      \"pmids\": [\"32017897\", \"34779554\", \"20663914\", \"33020468\", \"30135423\", \"32692974\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biochemical basis of recruitment to structured RNA not resolved\", \"How a single concentration-threshold protein is tuned across tissues unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Studies defined the disassembly and turnover machinery and disease coupling: ubiquitinated G3BP1 is engaged by FAF2/p97-VCP for SG disassembly after heat shock, rG4-binding stabilizes target mRNAs, and TDP-43 stabilizes G3BP1 transcripts — tying G3BP1 levels to ALS/FTD.\",\n      \"evidence\": \"Ubiquitination-site mutants with Co-IP, in vitro rG4 binding with pyridostatin displacement, and TDP-43 CLIP-seq with patient-neuron analysis\",\n      \"pmids\": [\"34739333\", \"34614161\", \"34115105\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase generating disassembly-linked ubiquitin not identified at this stage\", \"Causal contribution of G3BP1 loss to neurodegeneration not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The ubiquitin and acetylation circuitry was completed: TRIM21 K63-ubiquitination inhibits LLPS with autophagy receptors clearing SGs, DCAF7/USP10 removes K48 ubiquitin at K76 to stabilize G3BP1, and SIRT2 deacetylation of G3BP1 dismantles the cGAS complex to restrain interferon.\",\n      \"evidence\": \"E3-ligase screens, in vitro ubiquitination/LLPS and deacetylation assays with site mapping, and KO models\",\n      \"pmids\": [\"36692217\", \"38973296\", \"37870259\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Integration of competing ubiquitin linkages on the same molecule unresolved\", \"Cross-talk between acetylation and ubiquitination codes not mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Reconstitution work reframed G3BP1 as a transient condensate chaperone that seeds RNA-RNA interactions and then becomes dispensable, with DDX3X and decondensers controlling condensate dynamics, and demonstrated G3BP1-driven viral RNA condensation as a direct antiviral restriction countered by SARS-CoV-2 N protein.\",\n      \"evidence\": \"In vitro RNA condensate reconstitution with decondenser inactivation, DDX3X disease-mutant assays, and structure-guided N-protein mutagenesis with in vivo infection\",\n      \"pmids\": [\"39729994\", \"39637853\", \"38295168\", \"38492217\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How decondensers are spatially regulated within granules unclear\", \"Generality of RNA-only persistence across stress types untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many competing inputs — conformational autoinhibition, the combinatorial PTM code, mutually exclusive NTF2 partners, and condensate-resolving helicases — are integrated quantitatively to set the SG assembly/disassembly threshold in a given cell state remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified quantitative model linking PTMs, partner occupancy, and RNA load to phase behavior\", \"In vivo dynamics of competing regulators across tissues unmeasured\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [2, 5, 13, 17, 18, 44]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [5, 6, 30]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [6, 50]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 39, 40]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [33, 34, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 50]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 13, 44]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 1, 2, 16]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 9, 18, 26, 47]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 24, 45]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [41, 42, 37]}\n    ],\n    \"complexes\": [\"stress granule\", \"G3BP1-Caprin1-PKR complex\", \"cGAS-G3BP1 complex\", \"DCAF7-USP10-G3BP1 complex\"],\n    \"partners\": [\"Caprin1\", \"USP10\", \"PKR\", \"cGAS\", \"RIG-I\", \"FAF2\", \"eIF4GI\", \"DDX3X\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}