{"gene":"SERBP1","run_date":"2026-06-10T07:46:30","timeline":{"discoveries":[{"year":2012,"finding":"SERBP1 is asymmetrically dimethylated at arginine residues in its middle RG and C-terminal RGG regions by PRMT1. Knockdown of PRMT1 significantly reduced aDMA levels on SERBP1, and recombinant PRMT1 directly methylated SERBP1 in vitro. This methylation regulates subcellular localization: hypomethylation (via AdOx treatment or PRMT1 siRNA) shifts SERBP1 from predominantly cytoplasmic to nuclear localization.","method":"Co-immunoprecipitation, in vitro methylation assay with recombinant PRMT1, siRNA knockdown, immunofluorescence, deletion construct analysis","journal":"Journal of cellular biochemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro methylation assay with recombinant enzyme plus siRNA knockdown plus deletion mapping, multiple orthogonal methods in one study","pmids":["22442049"],"is_preprint":false},{"year":2013,"finding":"Under normal conditions SERBP1 localizes predominantly in the cytoplasm; upon arsenite-induced stress, a proportion co-localizes with stress granule marker TIA-1 in cytoplasmic stress granules, while another pool redistributes to the nucleolus. Hypomethylation (AdOx treatment) retains SERBP1 in the nucleus/nucleolus regardless of stress. Arginine methylation status is required for efficient recruitment to and retention in stress granules; all three SERBP1 domains contribute to stress granule targeting but none alone is sufficient.","method":"Immunofluorescence with stress granule markers, arsenite stress treatment, adenosine periodate (methylation inhibitor) treatment, truncation/deletion constructs, fluorescence microscopy","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiments with functional link to methylation, multiple deletion constructs and pharmacological perturbations, replicates findings from PMID:22442049","pmids":["24205981"],"is_preprint":false},{"year":2006,"finding":"CGI-55 (SERBP1) interacts with Daxx, Topors, PIAS1, PIAS3, PIASy, UBA2, TDG, and HPC2 — proteins associated with PML nuclear bodies, sumoylation, and transcriptional regulation — as identified by yeast two-hybrid and confirmed by co-localization in HeLa cells. SERBP1 localizes to the nucleolus and co-localizes with p80-coilin-positive nuclear Cajal bodies.","method":"Yeast two-hybrid screen, in vivo co-localization with GFP/RFP fusion proteins, domain mapping","journal":"Cell biochemistry and biophysics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — yeast two-hybrid plus co-localization confirmed for multiple partners, single lab","pmids":["16679534"],"is_preprint":false},{"year":2015,"finding":"SERBP1 regulates CtIP expression at the translational level specifically in S phase. SERBP1 binds CtIP mRNA (identified by RIP-seq), and SERBP1 depletion reduces polysome-associated CtIP mRNA and CtIP protein levels in S phase. Reconstitution with wild-type SERBP1 but not an RNA-binding-defective ΔRGG mutant rescues CtIP expression. SERBP1 depletion abrogates CHK1 and RPA2 phosphorylation (HR activation markers) after camptothecin-induced DSBs, placing SERBP1 upstream of CtIP-mediated homologous recombination.","method":"RIP-seq, siRNA knockdown, polysome profiling, reconstitution with WT and ΔRGG mutant, phosphorylation assays (CHK1, RPA2)","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — RIP-seq for target identification, polysome profiling, mutant reconstitution, multiple orthogonal functional readouts in one study","pmids":["26068472"],"is_preprint":false},{"year":2018,"finding":"Mammalian SERBP1 associates with cytoplasmic ribosomes as a component of the 40S small subunit and is present in actively translating polysomes. Subcellular fractionation showed cytoplasmic SERBP1 is pelleted by ultracentrifugation; cosedimentation with the 40S subunit was confirmed after ribosomal subunit dissociation; SERBP1 was identified by proteomic analysis in rodent testis ribosomes and in human cancer cell ribosomes.","method":"Subcellular fractionation, ultracentrifugation, polysome profiling, proteomic/mass spectrometry analysis, cosedimentation assay","journal":"Cell biochemistry and function","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal biochemical methods (fractionation, ultracentrifugation, polysome profiling, proteomics) in one study","pmids":["30039520"],"is_preprint":false},{"year":2017,"finding":"SERBP1 interacts selectively with the scaffold protein RACK1 via its C-terminal third (which contains one of its two PRMT1 substrate sites). Multiple SERBP1 isoforms interact with RACK1 with indistinguishable affinity. Single amino acid substitutions in RACK1 that disrupt SERBP1 binding substantially overlap with those disrupting PDE4D5 binding, indicating a shared interaction surface.","method":"Yeast two-hybrid system with beta-galactosidase assay, deletion construct analysis, reverse two-hybrid screen with RACK1 point mutants","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid with systematic deletion and mutant mapping, single lab, no reciprocal Co-IP","pmids":["28267599"],"is_preprint":false},{"year":2021,"finding":"SERBP1 is a substrate of PKCε: PKCε phosphorylates SERBP1 during mitosis, repressing protein translation and altering SERBP1 binding to the 40S ribosomal subunit. This promotes the assembly of ribonucleoprotein granules (M-bodies) containing SERBP1. SERBP1 is necessary for chromosome segregation and successful cell division independently of Aurora B, and M-body formation correlates with this requirement.","method":"UV-photocrosslinkable amino acid genetically-encoded crosslinker screen, in vivo phosphorylation assay, SERBP1 knockdown with chromosome segregation readout, ribosome association assay, M-body imaging","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — novel crosslinker trapping strategy to identify substrate, functional validation with loss-of-function phenotype and mechanistic dissection, multiple orthogonal methods","pmids":["34836941"],"is_preprint":false},{"year":2021,"finding":"SERBP1 is an intrinsically disordered protein containing a stable central α-helix; it binds G-rich RNA sequences through its C-terminal RGG box and neighboring residues. Both RGG boxes are required for efficient liquid-liquid phase separation (LLPS) mediated by salt and RNA. The central helix does not participate in RNA binding and the RGG boxes do not stabilize the central helix.","method":"Solution NMR spectroscopy, biophysical assays (multiple techniques), deletion/domain analysis, LLPS assay","journal":"Frontiers in molecular biosciences","confidence":"High","confidence_rationale":"Tier 1 / Strong — solution NMR plus multiple biophysical assays with domain mapping, rigorous structural characterization","pmids":["34631798"],"is_preprint":false},{"year":2013,"finding":"SPINDLIN1 (SPIN1), via its Tudor-like domain, forms a ribonucleoprotein complex with SERBP1 in mouse oocytes. This complex is involved in regulating mRNA stability and/or translation. Loss of Spin1 reduces PDE3A mRNA levels and causes meiotic arrest, placing SERBP1-SPIN1 interaction in the post-transcriptional control of maternal transcripts required for meiotic resumption.","method":"Co-immunoprecipitation, domain deletion analysis, conditional knockout mouse model, RNA level analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal interaction confirmed by Co-IP with domain mapping, genetic KO with phenotype, but SERBP1-specific molecular mechanism is partially inferred","pmids":["23894536"],"is_preprint":false},{"year":2020,"finding":"SERBP1 knockdown in GBM cells decreases methionine production, causing a reduction in histone H3K27me3 methylation and upregulation of neurogenesis/differentiation genes. SERBP1 regulates metabolic routes (one-carbon metabolism) used preferentially by cancer cells, indirectly modulating epigenetic regulation. SERBP1 binds GC-rich RNA motifs as identified by RNAcompete.","method":"siRNA knockdown, RNAcompete motif identification, metabolomics (methionine levels), histone methylation assays (H3K27me3), RNA-seq, GBM and glioma stem cell functional assays","journal":"Genome biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (knockdown + metabolomics + chromatin modification assays + RNA binding motif identification) in one comprehensive study","pmids":["32762776"],"is_preprint":false},{"year":2022,"finding":"RACK1, as part of the dengue virus (DENV) replication complex on the 40S ribosomal subunit, recruits SERBP1 (and Vigilin). SERBP1 interacts with the DENV RNA genome and its genetic ablation reduces viral translation and replication. A SERBP1 mutant lacking RACK1 binding but retaining viral RNA interaction cannot support DENV infection, indicating RACK1-SERBP1 interaction is required to link DENV RNA to the translation machinery.","method":"Mass spectrometry RACK1 interactome, RNA interference screen, genetic ablation, RNA-protein interaction assay with viral genome, SERBP1 RACK1-binding mutant analysis","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — interactome MS plus RNAi screen plus mutant rescue with multiple readouts (translation and replication), multiple orthogonal methods","pmids":["35266803"],"is_preprint":false},{"year":2022,"finding":"SERBP1 is upregulated during HCMV latency and functions as a scaffold protein to recruit the transcriptional repressor CHD3 (and KAP1) to the viral major immediate early promoter (MIEP), mediating epigenetic silencing during latent infection of myeloid cells. SERBP1 is required for MIEP suppression during latency.","method":"siRNA knockdown of SERBP1, ChIP assay for CHD3 and KAP1 at the MIEP, latency model in myeloid/CD34+ cells","journal":"Frontiers in microbiology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ChIP and knockdown with functional latency readout, single lab, two orthogonal methods","pmids":["36504797"],"is_preprint":false},{"year":2022,"finding":"SERBP1 associates with Argonaute2 (Ago2) in neuronal cells and modulates miRNA-mediated silencing. SERBP1 silencing attenuates miR-92-mediated repression of KCC2 3'UTR. Both SERBP1 and the Ago2/miR-92 complex bind to the KCC2 3'UTR, placing SERBP1 as a modulator of Ago2-RISC activity on this target.","method":"Immunoprecipitation and LC-MS/MS identification of Ago2 partners, RIP assay for KCC2 3'UTR binding, siRNA knockdown of SERBP1, luciferase reporter assay with KCC2 3'UTR","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — IP/MS plus RIP plus reporter assay plus siRNA, single lab, multiple orthogonal methods","pmids":["35326503"],"is_preprint":false},{"year":2023,"finding":"SERBP1 promotes stress granule (SG) clearance by interacting with the SG core component G3BP1 and 26S proteasome subunits PSMD10 and PSMA3, recruiting them to SGs. SERBP1 depletion results in reduced 20S proteasome activity at SGs, mislocalized VCP and FAF2, and diminished K63-linked polyubiquitination of G3BP1 during SG recovery. In vivo, SERBP1 depletion in testicular cells increases germ cell apoptosis upon heat stress.","method":"Co-immunoprecipitation, proteasome activity assay, ubiquitination assay (K63-linked), siRNA knockdown in somatic and germ cells, in vivo scrotal heat stress model","journal":"Research (Washington, D.C.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple Co-IPs defining complex components, functional proteasome activity assay, ubiquitination analysis, and in vivo genetic evidence","pmids":["37223481"],"is_preprint":false},{"year":2024,"finding":"KSHV-encoded vIL-6 promotes SIRT3-mediated deacetylation of SERBP1. Deacetylated SERBP1 fails to bind and protect Lipt2 mRNA from degradation, resulting in Lipt2 mRNA destabilization and ferroptosis suppression required for KSHV-induced cellular transformation. Acetylation of SERBP1 is thus a regulatory switch governing its mRNA-protective function on Lipt2 transcripts.","method":"Acetylation proteomics, SERBP1 deacetylation assay with SIRT3, RIP/mRNA stability assay for Lipt2, siRNA knockdown, SIRT3 inhibitor (3-TYP) treatment, cellular transformation assay","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — proteomics-based identification plus functional mRNA stability assay plus pharmacological and genetic perturbation, single lab","pmids":["38470932"],"is_preprint":false},{"year":2015,"finding":"SERBP1 is a component of the liver receptor homologue-1 (LRH1) transcriptional complex, identified by nuclear fractionation and mass spectrometry. LRH1 binds the SERBP1 promoter and represses its transcription; LRH1 knockdown increases SERBP1 expression, while LRH1 overexpression decreases SERBP1 mRNA levels.","method":"Nuclear fractionation, mass spectrometry, Western blot co-purification, siRNA knockdown of LRH1, promoter:reporter assay","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — MS identification plus functional promoter assay plus siRNA, single lab, multiple methods","pmids":["26398198"],"is_preprint":false},{"year":2025,"finding":"SERBP1 interacts with PARP1 and its associated factors, influences PARylation activity, and participates in protein complexes that are predominantly PARylated or contain PAR binders. SERBP1 preferentially interacts with G-quadruplex (G4)-binding proteins. SERBP1 is present in pathological stress granules and Tau aggregates in Alzheimer's brains, and has roles in splicing, cell division, and ribosome biogenesis as defined by interactome analysis.","method":"Interactome/proteomics (Co-IP + MS), PARylation assay, G4-binding partner enrichment analysis, patient brain tissue analysis","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — interactome MS plus functional PARylation assays, single lab, multiple methods but abstract-level description","pmids":["39937575"],"is_preprint":false},{"year":2024,"finding":"In situ cryo-EM revealed that SERBP1 binds to the ribosome in almost all translating and non-translating states inside human cells, bridging the 60S and 40S ribosomal subunits at newly identified binding sites not observed on purified ribosomes, suggesting SERBP1 plays an important regulatory role in translation.","method":"In situ single-particle cryo-EM (cryo-FIB milling + in situ cryo-EM), 2.19 Å consensus structure of 80S ribosome, 21 functional states resolved","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — high-resolution structural finding (cryo-EM) but preprint, single study, functional consequence inferred from structural observation","pmids":["bio_10.1101_2024.07.02.601723"],"is_preprint":true},{"year":2025,"finding":"SERBP1 recognizes G-quadruplex (G4) RNA and DNA structures with low micromolar affinity through its RGG box, which wraps around the G4 (encircling mechanism). C-terminal serine residues stabilize the complex through hydrogen bonding; phosphomimetic mutations of these serines reduce binding affinity, identifying phosphorylation as a regulatory switch. Recognition is driven by G4 topology rather than sequence. SERBP1 depletion reduces mTOR expression in glioblastoma cells via G4 elements in the mTOR 5' UTR.","method":"NMR spectroscopy, biophysical binding assays, molecular dynamics and docking simulations, phosphomimetic mutagenesis, SERBP1 knockdown with mTOR expression readout","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — NMR plus biophysical assays plus mutagenesis plus MD simulations, multiple orthogonal methods, but preprint","pmids":["41846982"],"is_preprint":true},{"year":2005,"finding":"PAIRBP1 (SERBP1) is present on the extracellular surface of granulosa and luteal cells, and an antibody against PAIRBP1 attenuates progesterone's antiapoptotic action in these cells without reducing progesterone binding. PAIRBP1 co-immunoprecipitates with the membrane progesterone binding protein PGRMC1, suggesting SERBP1 mediates progesterone's antiapoptotic signaling through interaction with PGRMC1.","method":"Immunocytochemistry on living non-permeabilized cells, antibody blocking assay, immunoprecipitation with PGRMC1, radiolabeled progesterone binding assay","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — functional antibody blocking plus Co-IP, single lab, two orthogonal methods","pmids":["15814896"],"is_preprint":false},{"year":2025,"finding":"SERBP1 forms a complex with PCIF1 (a methyltransferase) and this complex mediates m6Am deposition onto mRNA in glutamatergic neurons of the primary somatosensory cortex. SERBP1-PCIF1 upregulation in these neurons adds m6Am onto Maf1 mRNA, reducing MAF1 protein and contributing to neuropathic pain and anxiety comorbidity. Blocking SERBP1-PCIF1 upregulation abolishes m6Am gain on Maf1 and elevates MAF1 protein.","method":"Co-immunoprecipitation (SERBP1-PCIF1 complex), m6Am sequencing/detection, conditional neuronal manipulation (virus-mediated), behavioral assays for neuropathic pain and anxiety","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP establishing complex, m6Am mapping, in vivo loss- and gain-of-function with multiple readouts in one rigorous study","pmids":["40764612"],"is_preprint":false},{"year":2025,"finding":"SERBP1 promotes cisplatin resistance in lung adenocarcinoma by stabilizing BRCA1 mRNA, thereby activating RAD51-mediated homologous recombination repair. BRCA1 knockdown attenuates SERBP1-driven cisplatin resistance both in vitro and in vivo, establishing BRCA1 as a critical downstream effector in a SERBP1-BRCA1-RAD51 axis.","method":"siRNA/shRNA gain- and loss-of-function experiments, mRNA stability assay for BRCA1, RAD51 focus formation assay, in vitro and in vivo cisplatin resistance assays","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional epistasis established by BRCA1 rescue experiment plus mRNA stability assay, in vitro and in vivo, single lab","pmids":["41856985"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM revealed SERBP1 in an eEF2/SERBP1-associated dormant ribosome state that accumulates upon treatment with the translation inhibitor NT-2 mycotoxin, confirming SERBP1 association with an inactive ribosomal state in human cells.","method":"Cryo-EM at 1.76 Å resolution of human 80S ribosome from cell-free lysate treated with NT-2","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 1 / Weak — high-resolution cryo-EM structure but SERBP1 role is an incidental observation in a drug-mechanism study; preprint, no functional validation of SERBP1 in this context","pmids":["bio_10.1101_2025.10.11.680285"],"is_preprint":true},{"year":2014,"finding":"CGI-55 (SERBP1) overexpression in HEK293T cells reduces cell proliferation mainly through G1 phase arrest; siRNA knockdown of CGI-55/SERBP1 causes an increase in proliferation. SERBP1 overexpression downregulates genes associated with proliferation, apoptosis, and cell cycle control.","method":"DNA microarray transcriptomics after overexpression/siRNA knockdown, flow cytometry cell cycle analysis, qRT-PCR validation","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — transcriptomics plus cell cycle analysis plus siRNA knockdown with rescue, single lab, two orthogonal functional methods","pmids":["25205453"],"is_preprint":false},{"year":2024,"finding":"SYT1 (Synaptotagmin-1) binds to and stabilizes SERBP1 protein, and SERBP1 in turn enhances the stability of GLUT2 mRNA and its protein levels, protecting renal cells from paraquat intracellular accumulation. Immunoprecipitation-shotgun identified SERBP1 as a SYT1-bound protein; RNA interference of SERBP1 abolished SYT1's protective effects.","method":"Immunoprecipitation-shotgun proteomics, RNA interference of SERBP1, mRNA stability assay for GLUT2, cell toxicity and intracellular PQ accumulation assays","journal":"Chemico-biological interactions","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — IP proteomics plus siRNA knockdown plus mRNA stability assay, single lab","pmids":["39059605"],"is_preprint":false},{"year":2025,"finding":"Conditional deletion of Serbp1 in mouse oocytes (using Zp3/Gdf9-Cre) results in arrested oocyte growth, spindle assembly defects, impaired asymmetric cell division, failure of blastocyst formation, and female infertility. Serbp1 loss also induces granulosa cell apoptosis and elevated Erk1/2 phosphorylation, indicating both cell-autonomous and somatic-germline crosstalk functions.","method":"Conditional knockout mouse (Cre-lox), oocyte phenotype analysis (spindle imaging, meiotic competence), granulosa cell apoptosis assay, Erk1/2 phosphorylation assay","journal":"Molecular and cellular endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional KO with multiple specific phenotypic readouts at cellular and organism level","pmids":["40902969"],"is_preprint":false}],"current_model":"SERBP1 is an intrinsically disordered RNA-binding protein that recognizes G-rich and G-quadruplex RNA sequences via its C-terminal RGG box; it associates constitutively with both 40S and 60S ribosomal subunits to regulate translation, is phosphorylated by PKCε during mitosis to repress translation and promote M-body ribonucleoprotein granule assembly required for chromosome segregation, is asymmetrically dimethylated by PRMT1 on RG/RGG motifs to control its cytoplasmic-nuclear-nucleolar distribution and stress granule targeting, stabilizes specific mRNAs (including CtIP, BRCA1, GLUT2, and Lipt2) to regulate DNA repair, ferroptosis, and metabolic homeostasis, interacts with PARP1/PARylation machinery and the PCIF1 methyltransferase to deposit m6Am modifications on target mRNAs, and acts as a scaffold that recruits transcriptional repressors to chromatin and facilitates viral replication by linking viral RNA to the translation machinery through RACK1."},"narrative":{"mechanistic_narrative":"SERBP1 is an intrinsically disordered RNA-binding protein that operates as a ribosome-associated regulator of translation and a sequence/structure-selective mRNA-stability factor coordinating DNA repair, metabolism, and cell division [PMID:30039520, PMID:34631798, PMID:26068472]. Its C-terminal RGG box, together with neighboring residues flanking a non-RNA-binding central α-helix, recognizes G-rich RNA and folded G-quadruplex (G4) RNA/DNA structures by encircling the G4 in a topology-driven manner, and both RGG boxes drive RNA- and salt-dependent liquid-liquid phase separation [PMID:34631798, PMID:41846982]. In situ cryo-EM places SERBP1 on the ribosome across nearly all translating and non-translating states, bridging the 60S and 40S subunits, and biochemical fractionation confirms it co-sediments with the 40S subunit and polysomes [PMID:bio_10.1101_2024.07.02.601723, PMID:30039520]. SERBP1 binds and stabilizes specific transcripts to control downstream programs: it stabilizes CtIP mRNA to license CtIP-dependent homologous recombination after DNA damage and BRCA1 mRNA to drive RAD51-mediated repair and cisplatin resistance [PMID:26068472, PMID:41856985], stabilizes GLUT2 mRNA in a SYT1-dependent protective circuit [PMID:39059605], and protects Lipt2 mRNA to suppress ferroptosis [PMID:38470932]. Its activity is gated by reversible modifications: PRMT1 asymmetrically dimethylates its RG/RGG motifs to control cytoplasmic–nuclear–nucleolar partitioning and stress-granule recruitment, PKCε phosphorylates it during mitosis to repress translation, remodel 40S binding, and nucleate M-body ribonucleoprotein granules required for chromosome segregation, and serine phosphorylation in the RGG box acts as a switch lowering G4 affinity [PMID:22442049, PMID:24205981, PMID:34836941, PMID:41846982]. SERBP1 partitions into stress granules and also promotes their clearance by recruiting G3BP1 and 26S proteasome subunits to drive K63-ubiquitin-dependent disassembly [PMID:24205981, PMID:37223481]. Beyond cytoplasmic translation, SERBP1 acts as a scaffold linking RNA to chromatin and viral machinery—recruiting transcriptional repressors CHD3/KAP1 to the HCMV major immediate early promoter, bridging dengue virus RNA to the 40S subunit through RACK1, and forming a PCIF1 complex that deposits m6Am on target mRNAs [PMID:36504797, PMID:35266803, PMID:40764612]. Loss of Serbp1 in mouse oocytes causes spindle and asymmetric-division defects and female infertility, establishing an in vivo requirement in meiotic and developmental control [PMID:40902969].","teleology":[{"year":2005,"claim":"Established an early functional context by linking SERBP1/PAIRBP1 to membrane progesterone signaling, raising the question of where and how the protein acts.","evidence":"Surface immunocytochemistry, antibody blocking, and Co-IP with PGRMC1 in granulosa/luteal cells","pmids":["15814896"],"confidence":"Medium","gaps":["Surface/membrane localization conflicts with later RNA-binding and ribosomal roles","No direct molecular mechanism linking SERBP1 to progesterone signaling defined"]},{"year":2006,"claim":"Mapped an early nuclear interaction network, placing SERBP1 in PML body/sumoylation and Cajal body/nucleolar contexts before its RNA functions were known.","evidence":"Yeast two-hybrid screen plus co-localization in HeLa cells (Daxx, Topors, PIAS family, TDG, HPC2)","pmids":["16679534"],"confidence":"Medium","gaps":["Interactions not validated by reciprocal endogenous Co-IP","Functional consequence of nuclear-body partners unresolved"]},{"year":2012,"claim":"Identified PRMT1 as the enzyme that asymmetrically dimethylates SERBP1's RG/RGG motifs, answering how its subcellular distribution is controlled.","evidence":"In vitro methylation with recombinant PRMT1, siRNA knockdown, deletion mapping, immunofluorescence","pmids":["22442049"],"confidence":"High","gaps":["Functional consequence of methylation on RNA binding not directly tested","Whether methylation is dynamically regulated by stimuli unknown"]},{"year":2013,"claim":"Connected methylation status to stress-granule and nucleolar targeting, defining how modification routes SERBP1 between compartments under stress.","evidence":"Immunofluorescence with stress-granule/nucleolar markers, arsenite and AdOx treatment, deletion constructs","pmids":["24205981"],"confidence":"High","gaps":["No single domain sufficient for SG targeting; recruitment determinants incompletely defined","Functional role within SGs not established here"]},{"year":2013,"claim":"Showed SERBP1 forms a post-transcriptional regulatory RNP with SPIN1 controlling maternal transcript stability during meiosis.","evidence":"Reciprocal Co-IP with domain mapping and Spin1 conditional knockout with PDE3A mRNA readout in mouse oocytes","pmids":["23894536"],"confidence":"Medium","gaps":["SERBP1-specific contribution to mRNA control partly inferred from SPIN1 phenotype","Direct mRNA targets of the SERBP1-SPIN1 complex not enumerated"]},{"year":2014,"claim":"Demonstrated SERBP1 influences proliferation and cell-cycle progression, framing it as a growth regulator.","evidence":"DNA microarray, flow-cytometry cell-cycle analysis, and siRNA/overexpression in HEK293T","pmids":["25205453"],"confidence":"Medium","gaps":["Direct mRNA targets driving G1 arrest not identified","Transcriptional changes may be indirect"]},{"year":2015,"claim":"Provided the first direct mRNA-target mechanism: SERBP1 binds and translationally promotes CtIP in S phase, placing it upstream of homologous recombination.","evidence":"RIP-seq, polysome profiling, WT vs ΔRGG reconstitution, and CHK1/RPA2 phosphorylation after camptothecin","pmids":["26068472"],"confidence":"High","gaps":["Whether stabilization vs translational loading is the primary mechanism not fully separated","RGG-dependence shown but binding mode to CtIP mRNA not structurally defined"]},{"year":2015,"claim":"Revealed transcriptional feedback control of SERBP1 itself by the LRH1 complex.","evidence":"Nuclear fractionation/MS, promoter:reporter assay, LRH1 knockdown/overexpression","pmids":["26398198"],"confidence":"Medium","gaps":["Whether SERBP1 has reciprocal effects on LRH1 targets untested","Direct vs indirect promoter regulation not fully resolved"]},{"year":2017,"claim":"Defined a direct RACK1 interaction surface on SERBP1, providing a route to the ribosomal scaffold.","evidence":"Yeast two-hybrid with deletion and RACK1 point-mutant mapping","pmids":["28267599"],"confidence":"Medium","gaps":["No reciprocal endogenous Co-IP in this study","Functional consequence of RACK1 binding not tested here"]},{"year":2018,"claim":"Established SERBP1 as a constitutive component of cytoplasmic 40S subunits and active polysomes, grounding its translational role biochemically.","evidence":"Subcellular fractionation, ultracentrifugation, polysome profiling, ribosome proteomics","pmids":["30039520"],"confidence":"High","gaps":["Whether association is regulatory vs structural not resolved by fractionation alone","Stoichiometry on ribosomes not determined"]},{"year":2020,"claim":"Linked SERBP1 RNA binding to one-carbon metabolism and epigenetic state in cancer, broadening its role to metabolic-epigenetic control.","evidence":"siRNA knockdown, RNAcompete GC-rich motif identification, metabolomics, H3K27me3 assays, RNA-seq in GBM","pmids":["32762776"],"confidence":"High","gaps":["Direct mRNA targets mediating methionine/one-carbon effects not pinpointed","Causal chain from RNA binding to H3K27me3 is indirect"]},{"year":2021,"claim":"Solved the domain architecture—intrinsically disordered with a stable central helix and RGG-driven G-rich RNA binding and phase separation—explaining how SERBP1 engages RNA and condensates.","evidence":"Solution NMR, biophysical assays, deletion analysis, LLPS assay","pmids":["34631798"],"confidence":"High","gaps":["Function of the central helix unknown","Physiological RNAs driving LLPS in cells not identified"]},{"year":2021,"claim":"Identified PKCε-mediated mitotic phosphorylation as the switch that represses translation, remodels 40S binding, and nucleates M-body granules required for chromosome segregation.","evidence":"Genetically-encoded crosslinker substrate trapping, in vivo phosphorylation, knockdown with segregation/M-body readouts","pmids":["34836941"],"confidence":"High","gaps":["Phosphosite-to-function mapping on the ribosome not fully resolved","Composition and assembly mechanism of M-bodies incompletely defined"]},{"year":2022,"claim":"Showed RACK1 recruits SERBP1 to bridge dengue virus RNA to the 40S subunit, demonstrating functional hijacking of its ribosomal scaffolding role.","evidence":"RACK1 interactome MS, RNAi screen, viral-RNA interaction, RACK1-binding-deficient SERBP1 mutant rescue","pmids":["35266803"],"confidence":"High","gaps":["Whether host mRNA recruitment uses the same RACK1-dependent mechanism untested","Structural basis of viral RNA bridging not resolved"]},{"year":2022,"claim":"Extended SERBP1 to chromatin scaffolding, recruiting CHD3/KAP1 repressors to silence the HCMV MIEP during latency.","evidence":"siRNA knockdown and ChIP for CHD3/KAP1 at the MIEP in myeloid latency models","pmids":["36504797"],"confidence":"Medium","gaps":["Direct DNA/chromatin binding by SERBP1 not demonstrated","Whether RNA bridges SERBP1 to the promoter unknown"]},{"year":2022,"claim":"Placed SERBP1 as a modulator of Ago2-RISC activity on specific 3'UTR targets in neurons.","evidence":"IP/LC-MS/MS, RIP for KCC2 3'UTR, siRNA, luciferase reporter","pmids":["35326503"],"confidence":"Medium","gaps":["Mechanism of Ago2 modulation (recruitment vs displacement) unresolved","Direct vs indirect interaction with RISC not separated"]},{"year":2023,"claim":"Revealed SERBP1 as a driver of stress-granule clearance by recruiting G3BP1 and proteasome subunits to enable ubiquitin-dependent disassembly, with an in vivo germ-cell protective role.","evidence":"Co-IP, proteasome activity and K63-ubiquitination assays, knockdown in somatic/germ cells, scrotal heat-stress model","pmids":["37223481"],"confidence":"High","gaps":["How SERBP1 reconciles SG recruitment with SG clearance not fully resolved","Direct vs scaffold-mediated proteasome recruitment unclear"]},{"year":2024,"claim":"Showed acetylation governs SERBP1's mRNA-protective function, with SIRT3 deacetylation derepressing Lipt2 degradation and modulating ferroptosis in a viral context.","evidence":"Acetylation proteomics, SIRT3 deacetylation assay, Lipt2 RIP/stability, pharmacological/genetic perturbation, transformation assay","pmids":["38470932"],"confidence":"Medium","gaps":["Specific acetyl-lysine residues controlling RNA binding not mapped","Generality beyond Lipt2 untested"]},{"year":2024,"claim":"Linked SERBP1 to GLUT2 mRNA stabilization via SYT1, defining a protective metabolic circuit in renal cells.","evidence":"IP-shotgun proteomics, SERBP1 RNAi, GLUT2 mRNA stability and toxicity assays","pmids":["39059605"],"confidence":"Medium","gaps":["Mechanism by which SYT1 binding stabilizes SERBP1 unknown","Direct SERBP1-GLUT2 mRNA contact not structurally defined"]},{"year":2024,"claim":"Captured SERBP1 in situ on the ribosome across nearly all functional states, bridging 60S and 40S at sites invisible on purified ribosomes.","evidence":"In situ single-particle cryo-EM (cryo-FIB), 2.19 Å consensus 80S structure, 21 states (preprint)","pmids":["bio_10.1101_2024.07.02.601723"],"confidence":"Medium","gaps":["Regulatory function inferred from structural occupancy, not functionally tested","Preprint, awaits peer review"]},{"year":2025,"claim":"Defined the structural basis of G-quadruplex recognition by the RGG box and identified serine phosphorylation as a binding switch, with mTOR 5'UTR G4 as a functional target.","evidence":"NMR, biophysical binding, MD/docking, phosphomimetic mutagenesis, knockdown with mTOR readout (preprint)","pmids":["41846982"],"confidence":"Medium","gaps":["Preprint, awaits peer review","Which kinase phosphorylates the regulatory serines in vivo unknown"]},{"year":2025,"claim":"Showed SERBP1 partners with PARP1/PARylation machinery and G4-binding proteins and appears in pathological aggregates, broadening its interactome to splicing, division, and ribosome biogenesis.","evidence":"Interactome Co-IP/MS, PARylation assays, G4-partner enrichment, Alzheimer's brain tissue analysis","pmids":["39937575"],"confidence":"Medium","gaps":["Direct vs PAR-mediated nature of many interactions unresolved","Causal role in disease aggregates not established"]},{"year":2025,"claim":"Established a SERBP1-PCIF1 complex that deposits m6Am on mRNA in vivo, linking SERBP1 to RNA modification and behavior.","evidence":"Co-IP, m6Am mapping, virus-mediated neuronal gain/loss-of-function, behavioral assays","pmids":["40764612"],"confidence":"High","gaps":["Whether SERBP1 confers target specificity to PCIF1 mechanistically unclear","Generality of SERBP1-dependent m6Am beyond Maf1 untested"]},{"year":2025,"claim":"Demonstrated SERBP1 stabilizes BRCA1 mRNA to drive RAD51-mediated HR and chemoresistance, extending its DNA-repair role to a SERBP1-BRCA1-RAD51 axis.","evidence":"Gain/loss-of-function, BRCA1 mRNA stability, RAD51 foci, in vitro/in vivo cisplatin resistance with BRCA1 rescue","pmids":["41856985"],"confidence":"Medium","gaps":["Direct SERBP1-BRCA1 mRNA binding not structurally shown","Relationship to the earlier CtIP-HR axis not integrated"]},{"year":2025,"claim":"Provided an in vivo organismal requirement: oocyte-specific Serbp1 loss causes spindle/asymmetric-division defects and female infertility with germline-somatic crosstalk.","evidence":"Conditional knockout mouse, spindle imaging, granulosa apoptosis, Erk1/2 phosphorylation","pmids":["40902969"],"confidence":"High","gaps":["Molecular targets mediating spindle defects not identified","Whether phenotype reflects translational vs mRNA-stability functions unresolved"]},{"year":null,"claim":"It remains unresolved how SERBP1's many modification states (methylation, phosphorylation, acetylation) integrate on the ribosome to switch between promoting translation, repressing it, and selectively stabilizing specific mRNAs.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model coupling modification state to ribosome occupancy and target mRNA selection","Genome-wide direct mRNA target map versus ribosome-structural role not reconciled","Causal direction between SERBP1's translational and chromatin/RNA-modification roles unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[3,7,9,18]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[18]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[10,11,13]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[4,6,17]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[12,14,24]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1,4]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[1,2]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[4,17]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[11]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[3,12,20]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4,6,17]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[3,21]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[1,13]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[6,23,25]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[10,11,14]}],"complexes":["40S ribosomal subunit / 80S ribosome","M-body ribonucleoprotein granule","SERBP1-PCIF1 m6Am methyltransferase complex","LRH1 transcriptional complex"],"partners":["RACK1","PRMT1","PKCEPSILON","G3BP1","PCIF1","PARP1","SPIN1","PGRMC1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8NC51","full_name":"SERPINE1 mRNA-binding protein 1","aliases":["PAI1 RNA-binding protein 1","PAI-RBP1","Plasminogen activator inhibitor 1 RNA-binding protein"],"length_aa":408,"mass_kda":45.0,"function":"Ribosome-binding protein that promotes ribosome hibernation, a process during which ribosomes are stabilized in an inactive state and preserved from proteasomal degradation (PubMed:36691768). Acts via its association with EEF2/eEF2 factor, sequestering EEF2/eEF2 at the A-site of the ribosome and promoting ribosome stabilization and storage in an inactive state (By similarity). May also play a role in the regulation of mRNA stability: binds to the 3'-most 134 nt of the SERPINE1/PAI1 mRNA, a region which confers cyclic nucleotide regulation of message decay (PubMed:11001948). Seems to play a role in PML-nuclear bodies formation (PubMed:28695742)","subcellular_location":"Cytoplasm; Nucleus; Cytoplasm, perinuclear region","url":"https://www.uniprot.org/uniprotkb/Q8NC51/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/SERBP1","classification":"Common 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SERBP1","url":"https://www.omim.org/entry/607378"}],"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/SERBP1"},"hgnc":{"alias_symbol":["CGI-55","CHD3IP","HABP4L","Hero45","PAIRBP1","PAI-RBP1","DKFZP564M2423"],"prev_symbol":[]},"alphafold":{"accession":"Q8NC51","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NC51","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NC51-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NC51-F1-predicted_aligned_error_v6.png","plddt_mean":54.16},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SERBP1","jax_strain_url":"https://www.jax.org/strain/search?query=SERBP1"},"sequence":{"accession":"Q8NC51","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NC51.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NC51/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NC51"}},"corpus_meta":[{"pmid":"32762776","id":"PMC_32762776","title":"The RNA-binding protein SERBP1 functions as a novel oncogenic factor in 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Knockdown of PRMT1 significantly reduced aDMA levels on SERBP1, and recombinant PRMT1 directly methylated SERBP1 in vitro. This methylation regulates subcellular localization: hypomethylation (via AdOx treatment or PRMT1 siRNA) shifts SERBP1 from predominantly cytoplasmic to nuclear localization.\",\n      \"method\": \"Co-immunoprecipitation, in vitro methylation assay with recombinant PRMT1, siRNA knockdown, immunofluorescence, deletion construct analysis\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro methylation assay with recombinant enzyme plus siRNA knockdown plus deletion mapping, multiple orthogonal methods in one study\",\n      \"pmids\": [\"22442049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Under normal conditions SERBP1 localizes predominantly in the cytoplasm; upon arsenite-induced stress, a proportion co-localizes with stress granule marker TIA-1 in cytoplasmic stress granules, while another pool redistributes to the nucleolus. Hypomethylation (AdOx treatment) retains SERBP1 in the nucleus/nucleolus regardless of stress. Arginine methylation status is required for efficient recruitment to and retention in stress granules; all three SERBP1 domains contribute to stress granule targeting but none alone is sufficient.\",\n      \"method\": \"Immunofluorescence with stress granule markers, arsenite stress treatment, adenosine periodate (methylation inhibitor) treatment, truncation/deletion constructs, fluorescence microscopy\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments with functional link to methylation, multiple deletion constructs and pharmacological perturbations, replicates findings from PMID:22442049\",\n      \"pmids\": [\"24205981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CGI-55 (SERBP1) interacts with Daxx, Topors, PIAS1, PIAS3, PIASy, UBA2, TDG, and HPC2 — proteins associated with PML nuclear bodies, sumoylation, and transcriptional regulation — as identified by yeast two-hybrid and confirmed by co-localization in HeLa cells. SERBP1 localizes to the nucleolus and co-localizes with p80-coilin-positive nuclear Cajal bodies.\",\n      \"method\": \"Yeast two-hybrid screen, in vivo co-localization with GFP/RFP fusion proteins, domain mapping\",\n      \"journal\": \"Cell biochemistry and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — yeast two-hybrid plus co-localization confirmed for multiple partners, single lab\",\n      \"pmids\": [\"16679534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SERBP1 regulates CtIP expression at the translational level specifically in S phase. SERBP1 binds CtIP mRNA (identified by RIP-seq), and SERBP1 depletion reduces polysome-associated CtIP mRNA and CtIP protein levels in S phase. Reconstitution with wild-type SERBP1 but not an RNA-binding-defective ΔRGG mutant rescues CtIP expression. SERBP1 depletion abrogates CHK1 and RPA2 phosphorylation (HR activation markers) after camptothecin-induced DSBs, placing SERBP1 upstream of CtIP-mediated homologous recombination.\",\n      \"method\": \"RIP-seq, siRNA knockdown, polysome profiling, reconstitution with WT and ΔRGG mutant, phosphorylation assays (CHK1, RPA2)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — RIP-seq for target identification, polysome profiling, mutant reconstitution, multiple orthogonal functional readouts in one study\",\n      \"pmids\": [\"26068472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Mammalian SERBP1 associates with cytoplasmic ribosomes as a component of the 40S small subunit and is present in actively translating polysomes. Subcellular fractionation showed cytoplasmic SERBP1 is pelleted by ultracentrifugation; cosedimentation with the 40S subunit was confirmed after ribosomal subunit dissociation; SERBP1 was identified by proteomic analysis in rodent testis ribosomes and in human cancer cell ribosomes.\",\n      \"method\": \"Subcellular fractionation, ultracentrifugation, polysome profiling, proteomic/mass spectrometry analysis, cosedimentation assay\",\n      \"journal\": \"Cell biochemistry and function\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal biochemical methods (fractionation, ultracentrifugation, polysome profiling, proteomics) in one study\",\n      \"pmids\": [\"30039520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SERBP1 interacts selectively with the scaffold protein RACK1 via its C-terminal third (which contains one of its two PRMT1 substrate sites). Multiple SERBP1 isoforms interact with RACK1 with indistinguishable affinity. Single amino acid substitutions in RACK1 that disrupt SERBP1 binding substantially overlap with those disrupting PDE4D5 binding, indicating a shared interaction surface.\",\n      \"method\": \"Yeast two-hybrid system with beta-galactosidase assay, deletion construct analysis, reverse two-hybrid screen with RACK1 point mutants\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid with systematic deletion and mutant mapping, single lab, no reciprocal Co-IP\",\n      \"pmids\": [\"28267599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SERBP1 is a substrate of PKCε: PKCε phosphorylates SERBP1 during mitosis, repressing protein translation and altering SERBP1 binding to the 40S ribosomal subunit. This promotes the assembly of ribonucleoprotein granules (M-bodies) containing SERBP1. SERBP1 is necessary for chromosome segregation and successful cell division independently of Aurora B, and M-body formation correlates with this requirement.\",\n      \"method\": \"UV-photocrosslinkable amino acid genetically-encoded crosslinker screen, in vivo phosphorylation assay, SERBP1 knockdown with chromosome segregation readout, ribosome association assay, M-body imaging\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — novel crosslinker trapping strategy to identify substrate, functional validation with loss-of-function phenotype and mechanistic dissection, multiple orthogonal methods\",\n      \"pmids\": [\"34836941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SERBP1 is an intrinsically disordered protein containing a stable central α-helix; it binds G-rich RNA sequences through its C-terminal RGG box and neighboring residues. Both RGG boxes are required for efficient liquid-liquid phase separation (LLPS) mediated by salt and RNA. The central helix does not participate in RNA binding and the RGG boxes do not stabilize the central helix.\",\n      \"method\": \"Solution NMR spectroscopy, biophysical assays (multiple techniques), deletion/domain analysis, LLPS assay\",\n      \"journal\": \"Frontiers in molecular biosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — solution NMR plus multiple biophysical assays with domain mapping, rigorous structural characterization\",\n      \"pmids\": [\"34631798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SPINDLIN1 (SPIN1), via its Tudor-like domain, forms a ribonucleoprotein complex with SERBP1 in mouse oocytes. This complex is involved in regulating mRNA stability and/or translation. Loss of Spin1 reduces PDE3A mRNA levels and causes meiotic arrest, placing SERBP1-SPIN1 interaction in the post-transcriptional control of maternal transcripts required for meiotic resumption.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion analysis, conditional knockout mouse model, RNA level analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal interaction confirmed by Co-IP with domain mapping, genetic KO with phenotype, but SERBP1-specific molecular mechanism is partially inferred\",\n      \"pmids\": [\"23894536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SERBP1 knockdown in GBM cells decreases methionine production, causing a reduction in histone H3K27me3 methylation and upregulation of neurogenesis/differentiation genes. SERBP1 regulates metabolic routes (one-carbon metabolism) used preferentially by cancer cells, indirectly modulating epigenetic regulation. SERBP1 binds GC-rich RNA motifs as identified by RNAcompete.\",\n      \"method\": \"siRNA knockdown, RNAcompete motif identification, metabolomics (methionine levels), histone methylation assays (H3K27me3), RNA-seq, GBM and glioma stem cell functional assays\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (knockdown + metabolomics + chromatin modification assays + RNA binding motif identification) in one comprehensive study\",\n      \"pmids\": [\"32762776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RACK1, as part of the dengue virus (DENV) replication complex on the 40S ribosomal subunit, recruits SERBP1 (and Vigilin). SERBP1 interacts with the DENV RNA genome and its genetic ablation reduces viral translation and replication. A SERBP1 mutant lacking RACK1 binding but retaining viral RNA interaction cannot support DENV infection, indicating RACK1-SERBP1 interaction is required to link DENV RNA to the translation machinery.\",\n      \"method\": \"Mass spectrometry RACK1 interactome, RNA interference screen, genetic ablation, RNA-protein interaction assay with viral genome, SERBP1 RACK1-binding mutant analysis\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — interactome MS plus RNAi screen plus mutant rescue with multiple readouts (translation and replication), multiple orthogonal methods\",\n      \"pmids\": [\"35266803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SERBP1 is upregulated during HCMV latency and functions as a scaffold protein to recruit the transcriptional repressor CHD3 (and KAP1) to the viral major immediate early promoter (MIEP), mediating epigenetic silencing during latent infection of myeloid cells. SERBP1 is required for MIEP suppression during latency.\",\n      \"method\": \"siRNA knockdown of SERBP1, ChIP assay for CHD3 and KAP1 at the MIEP, latency model in myeloid/CD34+ cells\",\n      \"journal\": \"Frontiers in microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ChIP and knockdown with functional latency readout, single lab, two orthogonal methods\",\n      \"pmids\": [\"36504797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SERBP1 associates with Argonaute2 (Ago2) in neuronal cells and modulates miRNA-mediated silencing. SERBP1 silencing attenuates miR-92-mediated repression of KCC2 3'UTR. Both SERBP1 and the Ago2/miR-92 complex bind to the KCC2 3'UTR, placing SERBP1 as a modulator of Ago2-RISC activity on this target.\",\n      \"method\": \"Immunoprecipitation and LC-MS/MS identification of Ago2 partners, RIP assay for KCC2 3'UTR binding, siRNA knockdown of SERBP1, luciferase reporter assay with KCC2 3'UTR\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — IP/MS plus RIP plus reporter assay plus siRNA, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"35326503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SERBP1 promotes stress granule (SG) clearance by interacting with the SG core component G3BP1 and 26S proteasome subunits PSMD10 and PSMA3, recruiting them to SGs. SERBP1 depletion results in reduced 20S proteasome activity at SGs, mislocalized VCP and FAF2, and diminished K63-linked polyubiquitination of G3BP1 during SG recovery. In vivo, SERBP1 depletion in testicular cells increases germ cell apoptosis upon heat stress.\",\n      \"method\": \"Co-immunoprecipitation, proteasome activity assay, ubiquitination assay (K63-linked), siRNA knockdown in somatic and germ cells, in vivo scrotal heat stress model\",\n      \"journal\": \"Research (Washington, D.C.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple Co-IPs defining complex components, functional proteasome activity assay, ubiquitination analysis, and in vivo genetic evidence\",\n      \"pmids\": [\"37223481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KSHV-encoded vIL-6 promotes SIRT3-mediated deacetylation of SERBP1. Deacetylated SERBP1 fails to bind and protect Lipt2 mRNA from degradation, resulting in Lipt2 mRNA destabilization and ferroptosis suppression required for KSHV-induced cellular transformation. Acetylation of SERBP1 is thus a regulatory switch governing its mRNA-protective function on Lipt2 transcripts.\",\n      \"method\": \"Acetylation proteomics, SERBP1 deacetylation assay with SIRT3, RIP/mRNA stability assay for Lipt2, siRNA knockdown, SIRT3 inhibitor (3-TYP) treatment, cellular transformation assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — proteomics-based identification plus functional mRNA stability assay plus pharmacological and genetic perturbation, single lab\",\n      \"pmids\": [\"38470932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SERBP1 is a component of the liver receptor homologue-1 (LRH1) transcriptional complex, identified by nuclear fractionation and mass spectrometry. LRH1 binds the SERBP1 promoter and represses its transcription; LRH1 knockdown increases SERBP1 expression, while LRH1 overexpression decreases SERBP1 mRNA levels.\",\n      \"method\": \"Nuclear fractionation, mass spectrometry, Western blot co-purification, siRNA knockdown of LRH1, promoter:reporter assay\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — MS identification plus functional promoter assay plus siRNA, single lab, multiple methods\",\n      \"pmids\": [\"26398198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SERBP1 interacts with PARP1 and its associated factors, influences PARylation activity, and participates in protein complexes that are predominantly PARylated or contain PAR binders. SERBP1 preferentially interacts with G-quadruplex (G4)-binding proteins. SERBP1 is present in pathological stress granules and Tau aggregates in Alzheimer's brains, and has roles in splicing, cell division, and ribosome biogenesis as defined by interactome analysis.\",\n      \"method\": \"Interactome/proteomics (Co-IP + MS), PARylation assay, G4-binding partner enrichment analysis, patient brain tissue analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — interactome MS plus functional PARylation assays, single lab, multiple methods but abstract-level description\",\n      \"pmids\": [\"39937575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In situ cryo-EM revealed that SERBP1 binds to the ribosome in almost all translating and non-translating states inside human cells, bridging the 60S and 40S ribosomal subunits at newly identified binding sites not observed on purified ribosomes, suggesting SERBP1 plays an important regulatory role in translation.\",\n      \"method\": \"In situ single-particle cryo-EM (cryo-FIB milling + in situ cryo-EM), 2.19 Å consensus structure of 80S ribosome, 21 functional states resolved\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — high-resolution structural finding (cryo-EM) but preprint, single study, functional consequence inferred from structural observation\",\n      \"pmids\": [\"bio_10.1101_2024.07.02.601723\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SERBP1 recognizes G-quadruplex (G4) RNA and DNA structures with low micromolar affinity through its RGG box, which wraps around the G4 (encircling mechanism). C-terminal serine residues stabilize the complex through hydrogen bonding; phosphomimetic mutations of these serines reduce binding affinity, identifying phosphorylation as a regulatory switch. Recognition is driven by G4 topology rather than sequence. SERBP1 depletion reduces mTOR expression in glioblastoma cells via G4 elements in the mTOR 5' UTR.\",\n      \"method\": \"NMR spectroscopy, biophysical binding assays, molecular dynamics and docking simulations, phosphomimetic mutagenesis, SERBP1 knockdown with mTOR expression readout\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR plus biophysical assays plus mutagenesis plus MD simulations, multiple orthogonal methods, but preprint\",\n      \"pmids\": [\"41846982\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PAIRBP1 (SERBP1) is present on the extracellular surface of granulosa and luteal cells, and an antibody against PAIRBP1 attenuates progesterone's antiapoptotic action in these cells without reducing progesterone binding. PAIRBP1 co-immunoprecipitates with the membrane progesterone binding protein PGRMC1, suggesting SERBP1 mediates progesterone's antiapoptotic signaling through interaction with PGRMC1.\",\n      \"method\": \"Immunocytochemistry on living non-permeabilized cells, antibody blocking assay, immunoprecipitation with PGRMC1, radiolabeled progesterone binding assay\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — functional antibody blocking plus Co-IP, single lab, two orthogonal methods\",\n      \"pmids\": [\"15814896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SERBP1 forms a complex with PCIF1 (a methyltransferase) and this complex mediates m6Am deposition onto mRNA in glutamatergic neurons of the primary somatosensory cortex. SERBP1-PCIF1 upregulation in these neurons adds m6Am onto Maf1 mRNA, reducing MAF1 protein and contributing to neuropathic pain and anxiety comorbidity. Blocking SERBP1-PCIF1 upregulation abolishes m6Am gain on Maf1 and elevates MAF1 protein.\",\n      \"method\": \"Co-immunoprecipitation (SERBP1-PCIF1 complex), m6Am sequencing/detection, conditional neuronal manipulation (virus-mediated), behavioral assays for neuropathic pain and anxiety\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP establishing complex, m6Am mapping, in vivo loss- and gain-of-function with multiple readouts in one rigorous study\",\n      \"pmids\": [\"40764612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SERBP1 promotes cisplatin resistance in lung adenocarcinoma by stabilizing BRCA1 mRNA, thereby activating RAD51-mediated homologous recombination repair. BRCA1 knockdown attenuates SERBP1-driven cisplatin resistance both in vitro and in vivo, establishing BRCA1 as a critical downstream effector in a SERBP1-BRCA1-RAD51 axis.\",\n      \"method\": \"siRNA/shRNA gain- and loss-of-function experiments, mRNA stability assay for BRCA1, RAD51 focus formation assay, in vitro and in vivo cisplatin resistance assays\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional epistasis established by BRCA1 rescue experiment plus mRNA stability assay, in vitro and in vivo, single lab\",\n      \"pmids\": [\"41856985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM revealed SERBP1 in an eEF2/SERBP1-associated dormant ribosome state that accumulates upon treatment with the translation inhibitor NT-2 mycotoxin, confirming SERBP1 association with an inactive ribosomal state in human cells.\",\n      \"method\": \"Cryo-EM at 1.76 Å resolution of human 80S ribosome from cell-free lysate treated with NT-2\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 1 / Weak — high-resolution cryo-EM structure but SERBP1 role is an incidental observation in a drug-mechanism study; preprint, no functional validation of SERBP1 in this context\",\n      \"pmids\": [\"bio_10.1101_2025.10.11.680285\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CGI-55 (SERBP1) overexpression in HEK293T cells reduces cell proliferation mainly through G1 phase arrest; siRNA knockdown of CGI-55/SERBP1 causes an increase in proliferation. SERBP1 overexpression downregulates genes associated with proliferation, apoptosis, and cell cycle control.\",\n      \"method\": \"DNA microarray transcriptomics after overexpression/siRNA knockdown, flow cytometry cell cycle analysis, qRT-PCR validation\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — transcriptomics plus cell cycle analysis plus siRNA knockdown with rescue, single lab, two orthogonal functional methods\",\n      \"pmids\": [\"25205453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SYT1 (Synaptotagmin-1) binds to and stabilizes SERBP1 protein, and SERBP1 in turn enhances the stability of GLUT2 mRNA and its protein levels, protecting renal cells from paraquat intracellular accumulation. Immunoprecipitation-shotgun identified SERBP1 as a SYT1-bound protein; RNA interference of SERBP1 abolished SYT1's protective effects.\",\n      \"method\": \"Immunoprecipitation-shotgun proteomics, RNA interference of SERBP1, mRNA stability assay for GLUT2, cell toxicity and intracellular PQ accumulation assays\",\n      \"journal\": \"Chemico-biological interactions\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — IP proteomics plus siRNA knockdown plus mRNA stability assay, single lab\",\n      \"pmids\": [\"39059605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Conditional deletion of Serbp1 in mouse oocytes (using Zp3/Gdf9-Cre) results in arrested oocyte growth, spindle assembly defects, impaired asymmetric cell division, failure of blastocyst formation, and female infertility. Serbp1 loss also induces granulosa cell apoptosis and elevated Erk1/2 phosphorylation, indicating both cell-autonomous and somatic-germline crosstalk functions.\",\n      \"method\": \"Conditional knockout mouse (Cre-lox), oocyte phenotype analysis (spindle imaging, meiotic competence), granulosa cell apoptosis assay, Erk1/2 phosphorylation assay\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional KO with multiple specific phenotypic readouts at cellular and organism level\",\n      \"pmids\": [\"40902969\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SERBP1 is an intrinsically disordered RNA-binding protein that recognizes G-rich and G-quadruplex RNA sequences via its C-terminal RGG box; it associates constitutively with both 40S and 60S ribosomal subunits to regulate translation, is phosphorylated by PKCε during mitosis to repress translation and promote M-body ribonucleoprotein granule assembly required for chromosome segregation, is asymmetrically dimethylated by PRMT1 on RG/RGG motifs to control its cytoplasmic-nuclear-nucleolar distribution and stress granule targeting, stabilizes specific mRNAs (including CtIP, BRCA1, GLUT2, and Lipt2) to regulate DNA repair, ferroptosis, and metabolic homeostasis, interacts with PARP1/PARylation machinery and the PCIF1 methyltransferase to deposit m6Am modifications on target mRNAs, and acts as a scaffold that recruits transcriptional repressors to chromatin and facilitates viral replication by linking viral RNA to the translation machinery through RACK1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SERBP1 is an intrinsically disordered RNA-binding protein that operates as a ribosome-associated regulator of translation and a sequence/structure-selective mRNA-stability factor coordinating DNA repair, metabolism, and cell division [#4, #7, #3]. Its C-terminal RGG box, together with neighboring residues flanking a non-RNA-binding central \\u03b1-helix, recognizes G-rich RNA and folded G-quadruplex (G4) RNA/DNA structures by encircling the G4 in a topology-driven manner, and both RGG boxes drive RNA- and salt-dependent liquid-liquid phase separation [#7, #18]. In situ cryo-EM places SERBP1 on the ribosome across nearly all translating and non-translating states, bridging the 60S and 40S subunits, and biochemical fractionation confirms it co-sediments with the 40S subunit and polysomes [#17, #4]. SERBP1 binds and stabilizes specific transcripts to control downstream programs: it stabilizes CtIP mRNA to license CtIP-dependent homologous recombination after DNA damage and BRCA1 mRNA to drive RAD51-mediated repair and cisplatin resistance [#3, #21], stabilizes GLUT2 mRNA in a SYT1-dependent protective circuit [#24], and protects Lipt2 mRNA to suppress ferroptosis [#14]. Its activity is gated by reversible modifications: PRMT1 asymmetrically dimethylates its RG/RGG motifs to control cytoplasmic\\u2013nuclear\\u2013nucleolar partitioning and stress-granule recruitment, PKC\\u03b5 phosphorylates it during mitosis to repress translation, remodel 40S binding, and nucleate M-body ribonucleoprotein granules required for chromosome segregation, and serine phosphorylation in the RGG box acts as a switch lowering G4 affinity [#0, #1, #6, #18]. SERBP1 partitions into stress granules and also promotes their clearance by recruiting G3BP1 and 26S proteasome subunits to drive K63-ubiquitin-dependent disassembly [#1, #13]. Beyond cytoplasmic translation, SERBP1 acts as a scaffold linking RNA to chromatin and viral machinery\\u2014recruiting transcriptional repressors CHD3/KAP1 to the HCMV major immediate early promoter, bridging dengue virus RNA to the 40S subunit through RACK1, and forming a PCIF1 complex that deposits m6Am on target mRNAs [#11, #10, #20]. Loss of Serbp1 in mouse oocytes causes spindle and asymmetric-division defects and female infertility, establishing an in vivo requirement in meiotic and developmental control [#25].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established an early functional context by linking SERBP1/PAIRBP1 to membrane progesterone signaling, raising the question of where and how the protein acts.\",\n      \"evidence\": \"Surface immunocytochemistry, antibody blocking, and Co-IP with PGRMC1 in granulosa/luteal cells\",\n      \"pmids\": [\"15814896\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Surface/membrane localization conflicts with later RNA-binding and ribosomal roles\", \"No direct molecular mechanism linking SERBP1 to progesterone signaling defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapped an early nuclear interaction network, placing SERBP1 in PML body/sumoylation and Cajal body/nucleolar contexts before its RNA functions were known.\",\n      \"evidence\": \"Yeast two-hybrid screen plus co-localization in HeLa cells (Daxx, Topors, PIAS family, TDG, HPC2)\",\n      \"pmids\": [\"16679534\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interactions not validated by reciprocal endogenous Co-IP\", \"Functional consequence of nuclear-body partners unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified PRMT1 as the enzyme that asymmetrically dimethylates SERBP1's RG/RGG motifs, answering how its subcellular distribution is controlled.\",\n      \"evidence\": \"In vitro methylation with recombinant PRMT1, siRNA knockdown, deletion mapping, immunofluorescence\",\n      \"pmids\": [\"22442049\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of methylation on RNA binding not directly tested\", \"Whether methylation is dynamically regulated by stimuli unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected methylation status to stress-granule and nucleolar targeting, defining how modification routes SERBP1 between compartments under stress.\",\n      \"evidence\": \"Immunofluorescence with stress-granule/nucleolar markers, arsenite and AdOx treatment, deletion constructs\",\n      \"pmids\": [\"24205981\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No single domain sufficient for SG targeting; recruitment determinants incompletely defined\", \"Functional role within SGs not established here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed SERBP1 forms a post-transcriptional regulatory RNP with SPIN1 controlling maternal transcript stability during meiosis.\",\n      \"evidence\": \"Reciprocal Co-IP with domain mapping and Spin1 conditional knockout with PDE3A mRNA readout in mouse oocytes\",\n      \"pmids\": [\"23894536\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SERBP1-specific contribution to mRNA control partly inferred from SPIN1 phenotype\", \"Direct mRNA targets of the SERBP1-SPIN1 complex not enumerated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated SERBP1 influences proliferation and cell-cycle progression, framing it as a growth regulator.\",\n      \"evidence\": \"DNA microarray, flow-cytometry cell-cycle analysis, and siRNA/overexpression in HEK293T\",\n      \"pmids\": [\"25205453\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mRNA targets driving G1 arrest not identified\", \"Transcriptional changes may be indirect\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided the first direct mRNA-target mechanism: SERBP1 binds and translationally promotes CtIP in S phase, placing it upstream of homologous recombination.\",\n      \"evidence\": \"RIP-seq, polysome profiling, WT vs \\u0394RGG reconstitution, and CHK1/RPA2 phosphorylation after camptothecin\",\n      \"pmids\": [\"26068472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether stabilization vs translational loading is the primary mechanism not fully separated\", \"RGG-dependence shown but binding mode to CtIP mRNA not structurally defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed transcriptional feedback control of SERBP1 itself by the LRH1 complex.\",\n      \"evidence\": \"Nuclear fractionation/MS, promoter:reporter assay, LRH1 knockdown/overexpression\",\n      \"pmids\": [\"26398198\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SERBP1 has reciprocal effects on LRH1 targets untested\", \"Direct vs indirect promoter regulation not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a direct RACK1 interaction surface on SERBP1, providing a route to the ribosomal scaffold.\",\n      \"evidence\": \"Yeast two-hybrid with deletion and RACK1 point-mutant mapping\",\n      \"pmids\": [\"28267599\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reciprocal endogenous Co-IP in this study\", \"Functional consequence of RACK1 binding not tested here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established SERBP1 as a constitutive component of cytoplasmic 40S subunits and active polysomes, grounding its translational role biochemically.\",\n      \"evidence\": \"Subcellular fractionation, ultracentrifugation, polysome profiling, ribosome proteomics\",\n      \"pmids\": [\"30039520\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether association is regulatory vs structural not resolved by fractionation alone\", \"Stoichiometry on ribosomes not determined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked SERBP1 RNA binding to one-carbon metabolism and epigenetic state in cancer, broadening its role to metabolic-epigenetic control.\",\n      \"evidence\": \"siRNA knockdown, RNAcompete GC-rich motif identification, metabolomics, H3K27me3 assays, RNA-seq in GBM\",\n      \"pmids\": [\"32762776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mRNA targets mediating methionine/one-carbon effects not pinpointed\", \"Causal chain from RNA binding to H3K27me3 is indirect\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Solved the domain architecture\\u2014intrinsically disordered with a stable central helix and RGG-driven G-rich RNA binding and phase separation\\u2014explaining how SERBP1 engages RNA and condensates.\",\n      \"evidence\": \"Solution NMR, biophysical assays, deletion analysis, LLPS assay\",\n      \"pmids\": [\"34631798\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function of the central helix unknown\", \"Physiological RNAs driving LLPS in cells not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified PKC\\u03b5-mediated mitotic phosphorylation as the switch that represses translation, remodels 40S binding, and nucleates M-body granules required for chromosome segregation.\",\n      \"evidence\": \"Genetically-encoded crosslinker substrate trapping, in vivo phosphorylation, knockdown with segregation/M-body readouts\",\n      \"pmids\": [\"34836941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphosite-to-function mapping on the ribosome not fully resolved\", \"Composition and assembly mechanism of M-bodies incompletely defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed RACK1 recruits SERBP1 to bridge dengue virus RNA to the 40S subunit, demonstrating functional hijacking of its ribosomal scaffolding role.\",\n      \"evidence\": \"RACK1 interactome MS, RNAi screen, viral-RNA interaction, RACK1-binding-deficient SERBP1 mutant rescue\",\n      \"pmids\": [\"35266803\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether host mRNA recruitment uses the same RACK1-dependent mechanism untested\", \"Structural basis of viral RNA bridging not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended SERBP1 to chromatin scaffolding, recruiting CHD3/KAP1 repressors to silence the HCMV MIEP during latency.\",\n      \"evidence\": \"siRNA knockdown and ChIP for CHD3/KAP1 at the MIEP in myeloid latency models\",\n      \"pmids\": [\"36504797\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DNA/chromatin binding by SERBP1 not demonstrated\", \"Whether RNA bridges SERBP1 to the promoter unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placed SERBP1 as a modulator of Ago2-RISC activity on specific 3'UTR targets in neurons.\",\n      \"evidence\": \"IP/LC-MS/MS, RIP for KCC2 3'UTR, siRNA, luciferase reporter\",\n      \"pmids\": [\"35326503\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of Ago2 modulation (recruitment vs displacement) unresolved\", \"Direct vs indirect interaction with RISC not separated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed SERBP1 as a driver of stress-granule clearance by recruiting G3BP1 and proteasome subunits to enable ubiquitin-dependent disassembly, with an in vivo germ-cell protective role.\",\n      \"evidence\": \"Co-IP, proteasome activity and K63-ubiquitination assays, knockdown in somatic/germ cells, scrotal heat-stress model\",\n      \"pmids\": [\"37223481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SERBP1 reconciles SG recruitment with SG clearance not fully resolved\", \"Direct vs scaffold-mediated proteasome recruitment unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed acetylation governs SERBP1's mRNA-protective function, with SIRT3 deacetylation derepressing Lipt2 degradation and modulating ferroptosis in a viral context.\",\n      \"evidence\": \"Acetylation proteomics, SIRT3 deacetylation assay, Lipt2 RIP/stability, pharmacological/genetic perturbation, transformation assay\",\n      \"pmids\": [\"38470932\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific acetyl-lysine residues controlling RNA binding not mapped\", \"Generality beyond Lipt2 untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked SERBP1 to GLUT2 mRNA stabilization via SYT1, defining a protective metabolic circuit in renal cells.\",\n      \"evidence\": \"IP-shotgun proteomics, SERBP1 RNAi, GLUT2 mRNA stability and toxicity assays\",\n      \"pmids\": [\"39059605\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which SYT1 binding stabilizes SERBP1 unknown\", \"Direct SERBP1-GLUT2 mRNA contact not structurally defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Captured SERBP1 in situ on the ribosome across nearly all functional states, bridging 60S and 40S at sites invisible on purified ribosomes.\",\n      \"evidence\": \"In situ single-particle cryo-EM (cryo-FIB), 2.19 \\u00c5 consensus 80S structure, 21 states (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.07.02.601723\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Regulatory function inferred from structural occupancy, not functionally tested\", \"Preprint, awaits peer review\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined the structural basis of G-quadruplex recognition by the RGG box and identified serine phosphorylation as a binding switch, with mTOR 5'UTR G4 as a functional target.\",\n      \"evidence\": \"NMR, biophysical binding, MD/docking, phosphomimetic mutagenesis, knockdown with mTOR readout (preprint)\",\n      \"pmids\": [\"41846982\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, awaits peer review\", \"Which kinase phosphorylates the regulatory serines in vivo unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed SERBP1 partners with PARP1/PARylation machinery and G4-binding proteins and appears in pathological aggregates, broadening its interactome to splicing, division, and ribosome biogenesis.\",\n      \"evidence\": \"Interactome Co-IP/MS, PARylation assays, G4-partner enrichment, Alzheimer's brain tissue analysis\",\n      \"pmids\": [\"39937575\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs PAR-mediated nature of many interactions unresolved\", \"Causal role in disease aggregates not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established a SERBP1-PCIF1 complex that deposits m6Am on mRNA in vivo, linking SERBP1 to RNA modification and behavior.\",\n      \"evidence\": \"Co-IP, m6Am mapping, virus-mediated neuronal gain/loss-of-function, behavioral assays\",\n      \"pmids\": [\"40764612\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SERBP1 confers target specificity to PCIF1 mechanistically unclear\", \"Generality of SERBP1-dependent m6Am beyond Maf1 untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated SERBP1 stabilizes BRCA1 mRNA to drive RAD51-mediated HR and chemoresistance, extending its DNA-repair role to a SERBP1-BRCA1-RAD51 axis.\",\n      \"evidence\": \"Gain/loss-of-function, BRCA1 mRNA stability, RAD51 foci, in vitro/in vivo cisplatin resistance with BRCA1 rescue\",\n      \"pmids\": [\"41856985\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct SERBP1-BRCA1 mRNA binding not structurally shown\", \"Relationship to the earlier CtIP-HR axis not integrated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided an in vivo organismal requirement: oocyte-specific Serbp1 loss causes spindle/asymmetric-division defects and female infertility with germline-somatic crosstalk.\",\n      \"evidence\": \"Conditional knockout mouse, spindle imaging, granulosa apoptosis, Erk1/2 phosphorylation\",\n      \"pmids\": [\"40902969\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular targets mediating spindle defects not identified\", \"Whether phenotype reflects translational vs mRNA-stability functions unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how SERBP1's many modification states (methylation, phosphorylation, acetylation) integrate on the ribosome to switch between promoting translation, repressing it, and selectively stabilizing specific mRNAs.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coupling modification state to ribosome occupancy and target mRNA selection\", \"Genome-wide direct mRNA target map versus ribosome-structural role not reconciled\", \"Causal direction between SERBP1's translational and chromatin/RNA-modification roles unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [3, 7, 9, 18]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [10, 11, 13]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [4, 6, 17]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [12, 14, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [4, 17]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [3, 12, 20]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 6, 17]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [3, 21]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [1, 13]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [6, 23, 25]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [10, 11, 14]}\n    ],\n    \"complexes\": [\n      \"40S ribosomal subunit / 80S ribosome\",\n      \"M-body ribonucleoprotein granule\",\n      \"SERBP1-PCIF1 m6Am methyltransferase complex\",\n      \"LRH1 transcriptional complex\"\n    ],\n    \"partners\": [\n      \"RACK1\",\n      \"PRMT1\",\n      \"PKCepsilon\",\n      \"G3BP1\",\n      \"PCIF1\",\n      \"PARP1\",\n      \"SPIN1\",\n      \"PGRMC1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}