{"gene":"NOP53","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2011,"finding":"PICT1/NOP53 binds RPL11 in the nucleolus, retaining it there; loss of PICT1 releases RPL11 to the nucleoplasm where it binds MDM2, blocking MDM2-mediated ubiquitination of p53 and causing p53 accumulation and G1 arrest/apoptosis even without DNA damage.","method":"Pict1 knockout mouse/ES cells, Co-IP, cell cycle analysis, apoptosis assays, rescue experiments","journal":"Nature Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genetic knockout model with defined cellular phenotype, mechanistic rescue experiments, replicated in multiple cell types","pmids":["21804542"],"is_preprint":false},{"year":2006,"finding":"PICT-1/NOP53 binds and stabilizes PTEN protein; RNAi knockdown of PICT-1 decreases endogenous PTEN, activates downstream PI3K/Akt signaling, promotes proliferation and anchorage-independent growth in a PTEN-dependent manner.","method":"RNAi knockdown, western blot, PIP3 signaling assays, soft-agar colony formation, PTEN-null cell controls","journal":"Molecular Biology of the Cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RNAi, signaling readouts, isogenic PTEN-null controls), single lab","pmids":["16971513"],"is_preprint":false},{"year":2007,"finding":"GLTSCR2/NOP53 overexpression induces caspase-independent, PTEN-modulated apoptotic cell death; this cytotoxic activity is independent of its ability to phosphorylate PTEN, indicating a divergent cell death pathway.","method":"Overexpression, cell death assays, caspase activity assays, PTEN phosphorylation assays","journal":"Cell Death and Differentiation","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional overexpression with multiple readouts but single lab, mechanism not fully resolved","pmids":["17657248"],"is_preprint":false},{"year":2012,"finding":"GLTSCR2/NOP53 translocates from nucleolus to nucleoplasm under ribosomal stress, where it directly interacts with and stabilizes p53, inhibiting cell cycle progression independently of ARF.","method":"Co-IP, subcellular fractionation/immunofluorescence, ARF-null cell experiments, xenograft model","journal":"Cell Death and Differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ARF-independent mechanism shown with defined genetic controls, xenograft validation, single lab","pmids":["22522597"],"is_preprint":false},{"year":2017,"finding":"Crystal structure (3.2 Å) of S. cerevisiae Mtr4 bound to the arch-interacting motif (AIM) of Nop53 reveals that the KOW domain of Mtr4 recognizes AIM via hydrophobic and electrostatic interactions; NMR shows the KOW domain can simultaneously bind an AIM protein and structured RNA at adjacent surfaces.","method":"X-ray crystallography (3.2 Å), NMR, structure-function mutagenesis","journal":"RNA","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure plus NMR validation, multiple orthogonal structural methods","pmids":["28883156"],"is_preprint":false},{"year":2011,"finding":"GLTSCR2/NOP53 is involved in the DNA damage response; knockdown attenuates phospho-H2AX foci formation and phosphorylation of ATM, ATR, Chk1, Chk2, and H2AX, sensitizes cells to DNA damage, delays DNA repair, and abolishes G2/M checkpoint activation.","method":"shRNA knockdown, immunofluorescence (γH2AX foci), western blot for DDR kinases, DNA repair assays, checkpoint analysis","journal":"The American Journal of Pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal readouts (foci, phosphorylation, checkpoint), single lab with defined loss-of-function phenotypes","pmids":["21741933"],"is_preprint":false},{"year":2014,"finding":"Nucleolar stress inducers (actinomycin D, 5-fluorouridine, doxorubicin) cause proteasome-mediated degradation of PICT1/NOP53 in a ubiquitin-independent manner; the 20S proteasome degrades purified PICT1 in vitro; nucleolar localization is required for stress-induced degradation in cells.","method":"Proteasome inhibitors, E1 ubiquitin-activating enzyme inhibitor, genetic inactivation, in vitro 20S proteasome degradation assay, nucleoplasmic localization mutant","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted degradation assay plus cell-based mutant analysis and pharmacological validation, multiple orthogonal approaches","pmids":["24923447"],"is_preprint":false},{"year":2009,"finding":"PICT-1/NOP53 interacts with the KSHV anti-apoptotic protein KS-Bcl-2; ectopic PICT-1 expression dramatically increases nucleolar localization of KS-Bcl-2 and reduces its antiapoptotic activity, while PICT-1 knockdown abolishes nucleolar targeting of KS-Bcl-2.","method":"Yeast two-hybrid screen, Co-IP, confocal microscopy, siRNA knockdown, domain mapping","journal":"Journal of Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus Co-IP plus functional consequence (antiapoptotic activity change), single lab","pmids":["20042497"],"is_preprint":false},{"year":2010,"finding":"Ser518-dephosphorylated (growth-inhibitory) merlin interacts with PICT-1/NOP53 in the nucleolus; PICT-1 overexpression represses cyclin D1, arrests the cell cycle at G0/G1, and promotes apoptosis; a PICT-1 C-terminal truncation mutant lacking merlin-binding has reduced growth-inhibitory effects, and merlin siRNA attenuates PICT-1-induced growth inhibition.","method":"Co-IP, confocal microscopy, dominant-negative/truncation mutants, siRNA, cell cycle analysis, cyclin D1 western blot","journal":"The International Journal of Biochemistry & Cell Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, domain mutants, siRNA rescue, multiple orthogonal readouts, single lab","pmids":["21167305"],"is_preprint":false},{"year":2012,"finding":"Nucleolar localization of PICT-1/NOP53 is mediated by two independent nucleolar localization sequences (NoLS), which are relatively long, contain arginine and leucine clusters, and have flexible boundaries; neither NoLS is sufficient alone to direct full nucleolar targeting.","method":"Confocal microscopy of EGFP/myc-tagged fusion proteins, deletion/mutation analysis of NoLS","journal":"PLoS ONE","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live imaging with systematic deletion mapping, single lab, well-controlled localization study","pmids":["22292050"],"is_preprint":false},{"year":2014,"finding":"PICT-1/NOP53 self-associates to form homo-oligomers (primarily dimers, possibly higher-order), mediated by the carboxy-terminal domain, as shown by yeast two-hybrid, Co-IP, FRET in mammalian cells, in vitro microfluidic affinity assays, and glutaraldehyde cross-linking/gel filtration.","method":"Yeast two-hybrid, Co-IP, FRET, in vitro microfluidic affinity binding, glutaraldehyde cross-linking, gel filtration","journal":"Journal of Molecular Biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods including in vitro reconstitution and FRET in live cells, single lab but rigorous","pmids":["24735870"],"is_preprint":false},{"year":2015,"finding":"GLTSCR2/NOP53 redistributes from nucleolus to nucleoplasm where increased GLTSCR2-NPM interaction competitively inhibits NPM-MYC binary complex formation, reducing recruitment of NPM-MYC to MYC target gene promoters and suppressing MYC transcriptional and transformational activity.","method":"Co-IP, ChIP, luciferase reporter assay, anchorage-independent growth assay, confocal microscopy","journal":"The American Journal of Pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, and functional reporter assays, single lab with multiple methods","pmids":["25956029"],"is_preprint":false},{"year":2015,"finding":"GLTSCR2/NOP53 induces nucleoplasmic translocation and proteasomal polyubiquitination-dependent degradation of nucleophosmin (NPM); this decreases NPM-driven cellular transformation.","method":"Co-IP, confocal microscopy, proteasome inhibitor experiments, ubiquitination assay, soft agar assay","journal":"Journal of Cellular and Molecular Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assays, functional transformation assay, single lab","pmids":["25818168"],"is_preprint":false},{"year":2016,"finding":"During DNA damage, PICT-1/NOP53 is phosphorylated by ATM (at S233 and T289), then undergoes proteasomal degradation; loss of PICT-1 releases RPL11 from the nucleolus, increasing RPL11-MDM2 binding and promoting p53 accumulation. ATM co-localizes and interacts with PICT-1 in the nucleolus.","method":"Co-IP (ATM-PICT1, Ku70-PICT1), anti-phospho-substrate antibody, site-directed mutagenesis (S233A/T289A and phosphomimetic S233D/T289D), kinase inhibitors (wortmannin, KU55933), RPL11 localization by IF","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, phosphorylation site mutagenesis, pharmacological validation, multiple orthogonal readouts, single lab","pmids":["27829214"],"is_preprint":false},{"year":2016,"finding":"During viral infection (VSV, HSV-1), NOP53/GLTSCR2 translocates from nucleus to cytoplasm where it interacts with RIG-I and USP15; the triple interaction activates USP15 to remove K63-linked ubiquitination from RIG-I, attenuating RIG-I signaling and IFN-β production to support viral replication. Deletion of the NES of NOP53 abrogates this function.","method":"Co-IP (NOP53-RIG-I, NOP53-USP15), NES deletion mutant, IFN-β reporter assay, viral replication assays, ubiquitination assay","journal":"Scientific Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional NES mutant, ubiquitination assay, viral replication readout, single lab","pmids":["27824081"],"is_preprint":false},{"year":2016,"finding":"PICT-1/NOP53 overexpression triggers pro-death autophagy by directly binding ribosomal DNA (rDNA) and interacting with UBF, inhibiting UBF phosphorylation and Pol I recruitment to the rDNA promoter, thereby suppressing rRNA transcription and inactivating the AKT/mTOR/p70S6K signaling pathway.","method":"ChIP (PICT-1 on rDNA), Co-IP (PICT-1-UBF), truncation mutants, Pol I ChIP, AKT/mTOR signaling western blot, autophagy assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, Co-IP, domain mutants, multiple signaling readouts, single lab","pmids":["27729611"],"is_preprint":false},{"year":2016,"finding":"JNK activity (via phosphorylation of c-Jun) is required to maintain nucleolar localization of GLTSCR2/NOP53; inhibition of JNK by SP600125 or c-Jun peptide causes nucleoplasmic translocation of GLTSCR2 and its degradation via the proteasome-polyubiquitination pathway, mediated by reduced GLTSCR2 monomer-monomer binding affinity.","method":"Protein kinase inhibitor screen, immunocytochemistry, cycloheximide chase, ubiquitination assay, Co-IP (oligomer status)","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pharmacological inhibitor approach with multiple readouts, single lab, mechanism partially inferred","pmids":["26903295"],"is_preprint":false},{"year":2017,"finding":"GLTSCR2/NOP53 binds ARF in the nucleolus and promotes ARF translocation to the nucleoplasm where it increases ARF binding to the E3 ubiquitin ligase ULF/TRIP12, enhancing ARF polyubiquitination and degradation.","method":"Co-IP (GLTSCR2-ARF, ARF-ULF), confocal microscopy (ARF localization), ubiquitination assay","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, localization tracking, single lab","pmids":["27323397"],"is_preprint":false},{"year":2018,"finding":"NOP53/GLTSCR2 translocates to the cytoplasm during HSV-1 infection driven by viral protein γ34.5; cytoplasmic NOP53 facilitates γ34.5 recruitment of protein phosphatase PP1α to dephosphorylate eIF2α, enabling efficient viral protein translation. NOP53 knockdown impairs the γ34.5-PP1α interaction and reduces viral virulence in vivo.","method":"Co-IP (NOP53-γ34.5, γ34.5-PP1α), eIF2α phosphorylation western blot, viral yield assays, in vitro expression, mouse infection model","journal":"Cell Death & Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, in vitro expression, in vivo mouse model, multiple orthogonal readouts, single lab","pmids":["29367603"],"is_preprint":false},{"year":2019,"finding":"Yeast Nop53 controls when the RNA exosome associates with pre-60S particles; Nop53 interacts with the exosome catalytic subunit Rrp6, Mtr4, and 25S rRNA and acts as an adaptor recruiting the exosome for 7S pre-rRNA processing to 5.8S rRNA. Proteomic analysis suggests Nop53 also positions the exosome during 7S processing.","method":"Proteomics-based interactome analysis (MS), Co-IP (Nop53-Rrp6, Nop53-Mtr4), pre-rRNA processing assays in yeast","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics plus Co-IP plus rRNA processing functional assay, single lab, yeast ortholog","pmids":["31662437"],"is_preprint":false},{"year":2021,"finding":"Yeast Nop53 has a structural role in pre-60S maturation: it replaces Erb1 at the foot of the pre-60S particle, and its depletion (not just AIM mutants) blocks transition from nucleolar state E particle to nuclear stages and impairs late maturation events including Yvh1 recruitment. The AIM-exosome interaction is required specifically for late (not early) ITS2 processing.","method":"Yeast genetics (depletion, AIM mutants), cryo-EM-informed biochemical analysis, northern blot (pre-rRNA intermediates), proteomics","journal":"Nucleic Acids Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic dissection with AIM mutants vs depletion, multiple pre-rRNA processing readouts, consistent with structural data, single lab","pmids":["34125911"],"is_preprint":false},{"year":2021,"finding":"NOP53 suppresses autophagy through two pathways: (1) transcriptional activation of the master autophagy suppressor ZKSCAN3, inhibiting LC3B induction; and (2) physical interaction with histone H3 to dephosphorylate H3-S10, transcriptionally downregulating ATG7 and ATG12 expression.","method":"Co-IP (NOP53-H3), ChIP, luciferase reporter, siRNA knockdown, autophagy flux assays (LC3B, ATG7, ATG12 western blot)","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, reporter assay, multiple pathway readouts, single lab","pmids":["34502226"],"is_preprint":false},{"year":2022,"finding":"Human PICT1/NOP53 interacts with MTR4 and the RNA exosome via an AIM sequence and is involved in two distinct pre-rRNA processing steps during 60S biogenesis: early cleavage of 32S intermediate RNA and late maturation of 12S precursor to 5.8S rRNA. AIM-dependent MTR4/exosome recruitment is required only for the late step. PICT1 or MTR4 depletion (but not exosome catalytic subunit depletion) stabilizes p53, linking the ribosome biogenesis function to nucleolar stress signaling.","method":"Co-IP (PICT1-MTR4, PICT1-exosome), AIM mutant overexpression, siRNA knockdown, northern blot (pre-rRNA intermediates), p53 western blot","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, AIM mutant analysis, pre-rRNA processing northern blot, p53 readout, single lab","pmids":["36403484"],"is_preprint":false},{"year":2022,"finding":"NOP53 undergoes liquid-liquid phase separation (LLPS) in vitro and in vivo; its intrinsically disordered region 1 (IDR1) is required for phase separation, while multivalent arginine-rich linear motifs (M-R motifs) are required for nucleolar localization but dispensable for LLPS. NOP53 negatively regulates the p53 pathway in colorectal cancer cells with or without radiation.","method":"LLPS droplet assays (fusion, FRAP, 1,6-hexanediol sensitivity), IDR1 deletion mutant, M-R motif mutant, confocal microscopy, p53 pathway western blot, clonogenic survival assay","journal":"Cell Death Discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple LLPS validation criteria (FRAP, fusion, hexanediol) plus domain mutant analysis, single lab","pmids":["36316314"],"is_preprint":false},{"year":2024,"finding":"PICT1/NOP53 interacts with MRE11 (a DNA damage repair factor) in alveolar type II cells; PICT1 deletion leads to increased ROS, mitochondrial dysfunction, impaired mitochondrial respiration, and impaired DNA damage repair following cigarette smoke extract exposure.","method":"Co-IP followed by mass spectrometry (identified MRE11 as novel PICT1 interactor), PICT1 deletion cell model, ROS assay, mitochondrial respiration assay, DNA damage assays","journal":"Cell Communication and Signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS identification of novel interactor plus functional KO readouts, single lab","pmids":["39578839"],"is_preprint":false},{"year":2014,"finding":"GLTSCR2/PICT1 enhances mitochondrial function and is required for maintenance of oxygen consumption; its inactivation in C. elegans reduces respiration. GLTSCR2 controls cellular proliferation and metabolism via the transcription factor Myc and is induced by mitochondrial stress.","method":"High-throughput overexpression screen (flow cytometry), RNAi in C. elegans (respiration assay), Myc target gene analysis","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional screen plus C. elegans ortholog validation, multiple readouts, but mechanistic detail on Myc connection is limited in abstract","pmids":["24556985"],"is_preprint":false},{"year":2013,"finding":"PICT1/NOP53 loss in gastric cancer cells causes RPL11 translocation out of the nucleolus, impairing cell proliferation and colony formation via TP53-mediated cell cycle arrest.","method":"shRNA knockdown, RPL11 immunofluorescence (localization), colony formation assay, cell cycle analysis","journal":"British Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — shRNA with defined localization and functional readouts, single lab, consistent with primary mechanism paper","pmids":["24045667"],"is_preprint":false}],"current_model":"NOP53 (PICT1/GLTSCR2) is a nucleolar protein that retains RPL11 in the nucleolus to suppress the RPL11-MDM2-p53 axis; its loss (or stress-induced degradation/translocation) releases RPL11 to inhibit MDM2, stabilizing p53 and triggering cell cycle arrest or apoptosis. NOP53 also directly stabilizes p53 by binding it in the nucleoplasm upon ribosomal stress (ARF-independently), recruits the RNA exosome via an AIM-MTR4 interaction to process 5.8S/pre-5.8S rRNA during 60S ribosome maturation, undergoes ubiquitin-independent 20S proteasomal degradation in response to nucleolar stress (requiring nucleolar localization), self-oligomerizes via its C-terminal domain, stabilizes PTEN protein to modulate PI3K/AKT signaling, inhibits the oncogenic NPM-MYC transcriptional axis, suppresses autophagy through ZKSCAN3 and histone H3-S10 dephosphorylation, undergoes liquid-liquid phase separation via IDR1, and translocates to the cytoplasm during viral infection where it facilitates USP15-mediated deubiquitination of RIG-I to attenuate innate immune signaling."},"narrative":{"mechanistic_narrative":"NOP53 (PICT1/GLTSCR2) is a nucleolar protein that couples 60S ribosome biogenesis to the surveillance pathways that govern cell proliferation, p53 stabilization, and innate immunity [PMID:21804542, PMID:36403484]. In its core biogenesis role it acts as an adaptor that recruits the MTR4-RNA exosome to pre-60S particles through an arch-interacting motif (AIM) recognized by the KOW domain of MTR4, directing late ITS2/pre-rRNA processing to mature 5.8S rRNA, and it additionally serves a structural role in pre-60S maturation [PMID:28883156, PMID:31662437, PMID:34125911, PMID:36403484]. NOP53 governs the nucleolar stress response: under ribosomal or genotoxic stress it redistributes from nucleolus to nucleoplasm and is degraded — either by ubiquitin-independent 20S proteasomal turnover that requires nucleolar localization [PMID:24923447] or, during DNA damage, following ATM-mediated phosphorylation [PMID:27829214] — releasing RPL11 to inhibit MDM2 and stabilize p53, driving G1 arrest and apoptosis [PMID:21804542, PMID:24045667]. NOP53 also stabilizes p53 directly by binding it in the nucleoplasm independently of ARF [PMID:22522597], and disruption of its biogenesis function (loss of NOP53 or MTR4) is sufficient to trigger p53 accumulation, linking ribosome assembly to checkpoint signaling [PMID:36403484]. Beyond p53, NOP53 stabilizes PTEN to restrain PI3K/AKT signaling [PMID:16971513], antagonizes the oncogenic NPM-MYC transcriptional axis [PMID:25956029, PMID:25818168], and suppresses autophagy via ZKSCAN3 transcriptional control and histone H3-S10 dephosphorylation [PMID:34502226]. Its assembly into the nucleolus is mediated by two nucleolar localization sequences and self-oligomerization through its C-terminal domain [PMID:22292050, PMID:24735870], and it concentrates into nucleolar condensates by liquid-liquid phase separation driven by IDR1 [PMID:36316314]. During viral infection NOP53 is exported to the cytoplasm, where it promotes USP15-mediated deubiquitination of RIG-I to attenuate IFN-β signaling [PMID:27824081] and assists HSV-1 γ34.5 in recruiting PP1α to dephosphorylate eIF2α for viral translation [PMID:29367603].","teleology":[{"year":2006,"claim":"Established a first molecular function for NOP53 outside the nucleolus by showing it binds and stabilizes the PTEN tumor suppressor, linking it to growth-suppressive PI3K/AKT control.","evidence":"RNAi knockdown with PIP3 signaling readouts and PTEN-null isogenic controls in cultured cells","pmids":["16971513"],"confidence":"High","gaps":["Did not define the structural basis or domain of the NOP53-PTEN interaction","Did not connect PTEN stabilization to the later-defined nucleolar/ribosome biogenesis role"]},{"year":2007,"claim":"Showed NOP53 overexpression drives caspase-independent, PTEN-modulated cell death distinct from its effect on PTEN phosphorylation, indicating divergent pro-death activities.","evidence":"Overexpression with cell death and caspase activity assays","pmids":["17657248"],"confidence":"Medium","gaps":["Death pathway not molecularly resolved","Single lab, overexpression-based"]},{"year":2011,"claim":"Defined the central nucleolar-stress mechanism: NOP53 retains RPL11 in the nucleolus, and its loss releases RPL11 to inhibit MDM2 and stabilize p53, triggering arrest/apoptosis without DNA damage.","evidence":"Pict1 knockout mouse/ES cells, reciprocal Co-IP, rescue, cell cycle and apoptosis assays","pmids":["21804542"],"confidence":"High","gaps":["Did not address how RPL11 retention is regulated mechanistically","Left open the link between RPL11 retention and ribosome biogenesis"]},{"year":2011,"claim":"Implicated NOP53 in the DNA damage response, showing its loss blunts DDR kinase signaling and abolishes the G2/M checkpoint.","evidence":"shRNA knockdown with γH2AX foci, DDR kinase phosphorylation western blots, and checkpoint analysis","pmids":["21741933"],"confidence":"Medium","gaps":["Did not establish whether NOP53 acts directly on DDR kinases","Single lab, correlative phosphorylation readouts"]},{"year":2012,"claim":"Demonstrated NOP53 also stabilizes p53 directly by binding it in the nucleoplasm under ribosomal stress, defining an ARF-independent arm of p53 control.","evidence":"Co-IP, subcellular fractionation, ARF-null cell experiments, xenograft model","pmids":["22522597"],"confidence":"Medium","gaps":["Did not reconcile direct p53 binding with the RPL11-MDM2 mechanism","Stoichiometry and binding interface undefined"]},{"year":2012,"claim":"Mapped the determinants of NOP53 nucleolar targeting to two independent, non-redundant nucleolar localization sequences.","evidence":"Confocal imaging of tagged fusions with systematic NoLS deletion/mutation","pmids":["22292050"],"confidence":"Medium","gaps":["Did not identify the nucleolar binding partners read by the NoLS","No link to stress-induced relocalization"]},{"year":2013,"claim":"Extended the RPL11-p53 mechanism to a cancer context, showing NOP53 loss in gastric cancer cells displaces RPL11 and triggers TP53-dependent arrest.","evidence":"shRNA knockdown with RPL11 immunofluorescence, colony formation, cell cycle analysis","pmids":["24045667"],"confidence":"Medium","gaps":["Did not test the pathway in patient tumors mechanistically","Single lab"]},{"year":2014,"claim":"Revealed how NOP53 protein levels are controlled under nucleolar stress: ubiquitin-independent 20S proteasomal degradation that requires nucleolar localization.","evidence":"Proteasome/E1 inhibitors, in vitro 20S degradation of purified protein, nucleoplasmic localization mutant","pmids":["24923447"],"confidence":"High","gaps":["Did not identify the structural feature licensing 20S recognition","Relationship to ubiquitin-dependent degradation routes unresolved"]},{"year":2014,"claim":"Connected NOP53 to mitochondrial function and Myc-driven metabolism, showing it is required to maintain respiration.","evidence":"Overexpression screen, RNAi in C. elegans respiration assay, Myc target analysis","pmids":["24556985"],"confidence":"Medium","gaps":["Mechanistic link between NOP53 and Myc left undefined","Mitochondrial role not localized to a NOP53 molecular activity"]},{"year":2014,"claim":"Showed NOP53 self-associates via its C-terminal domain to form homo-oligomers, defining a structural property relevant to its assembly and regulation.","evidence":"Yeast two-hybrid, Co-IP, FRET, in vitro microfluidic affinity, cross-linking/gel filtration","pmids":["24735870"],"confidence":"High","gaps":["Functional consequence of oligomerization for biogenesis not directly tested here","Higher-order assembly state ambiguous"]},{"year":2015,"claim":"Identified an anti-oncogenic transcriptional function: nucleoplasmic NOP53 competes with MYC for NPM, suppressing NPM-MYC target gene activation and transformation.","evidence":"Co-IP, ChIP, luciferase reporter, anchorage-independent growth assay","pmids":["25956029"],"confidence":"Medium","gaps":["Did not establish in vivo relevance of NPM competition","Single lab"]},{"year":2015,"claim":"Showed NOP53 additionally promotes proteasomal, ubiquitination-dependent degradation of NPM, reinforcing its suppression of NPM-driven transformation.","evidence":"Co-IP, ubiquitination assay, proteasome inhibitor experiments, soft agar assay","pmids":["25818168"],"confidence":"Medium","gaps":["E3 ligase for NPM not identified","Relationship to the competitive NPM-MYC mechanism unresolved"]},{"year":2016,"claim":"Defined the DNA-damage trigger for NOP53 turnover: ATM phosphorylates NOP53 (S233/T289), driving its proteasomal degradation and RPL11 release to stabilize p53.","evidence":"Co-IP, phospho-site mutagenesis, kinase inhibitors, RPL11 localization by IF","pmids":["27829214"],"confidence":"Medium","gaps":["Did not reconcile with the ubiquitin-independent 20S degradation route","Direct ATM kinase assay on NOP53 not shown"]},{"year":2016,"claim":"Linked an upstream kinase signal to NOP53 localization, showing JNK/c-Jun activity maintains nucleolar NOP53 by sustaining monomer-monomer binding, with inhibition causing translocation and degradation.","evidence":"Kinase inhibitor screen, immunocytochemistry, cycloheximide chase, ubiquitination and oligomer Co-IP","pmids":["26903295"],"confidence":"Medium","gaps":["Mechanism partly inferred from pharmacology","Direct JNK target site on NOP53 not mapped"]},{"year":2016,"claim":"Added a transcription-coupled autophagy arm, showing NOP53 binds rDNA and UBF to repress Pol I recruitment and rRNA transcription, inactivating AKT/mTOR and inducing pro-death autophagy.","evidence":"ChIP on rDNA, Co-IP with UBF, truncation mutants, signaling western blots, autophagy assays","pmids":["27729611"],"confidence":"Medium","gaps":["Overexpression-driven phenotype","Relationship to its exosome-recruitment biogenesis role not addressed"]},{"year":2016,"claim":"Established a viral immune-evasion function: cytoplasmic NOP53 bridges RIG-I and USP15 to remove K63-ubiquitin from RIG-I, dampening IFN-β and aiding viral replication.","evidence":"Co-IP, NES deletion mutant, IFN-β reporter, ubiquitination and viral replication assays","pmids":["27824081"],"confidence":"Medium","gaps":["What signals NOP53 nuclear export during infection not defined","Single lab"]},{"year":2017,"claim":"Resolved the structural basis of NOP53-exosome recruitment, showing the MTR4 KOW domain recognizes the NOP53 AIM and can simultaneously engage AIM protein and RNA.","evidence":"3.2 Å X-ray crystallography of Mtr4-AIM, NMR, structure-function mutagenesis (yeast)","pmids":["28883156"],"confidence":"High","gaps":["Structure determined for yeast orthologs","Did not capture the full pre-60S context of the interaction"]},{"year":2017,"claim":"Showed NOP53 promotes ARF translocation and ULF/TRIP12-dependent degradation, adding another node by which NOP53 shapes the p53 regulatory network.","evidence":"Co-IP, ARF localization microscopy, ubiquitination assay","pmids":["27323397"],"confidence":"Medium","gaps":["Reconciliation with NOP53's ARF-independent p53 stabilization unresolved","Single lab"]},{"year":2018,"claim":"Defined a second viral mechanism, with cytoplasmic NOP53 enabling HSV-1 γ34.5 recruitment of PP1α to dephosphorylate eIF2α and sustain viral translation.","evidence":"Co-IP, eIF2α phosphorylation western blot, viral yield assays, mouse infection model","pmids":["29367603"],"confidence":"Medium","gaps":["Whether the same export pathway is used as in RIG-I attenuation not tested","Host consequence in uninfected cells unclear"]},{"year":2019,"claim":"Established NOP53 as the adaptor that times RNA exosome association with pre-60S particles, interacting with Rrp6, Mtr4 and 25S rRNA to drive 7S→5.8S processing.","evidence":"Proteomic interactome, Co-IP, pre-rRNA processing assays in yeast","pmids":["31662437"],"confidence":"Medium","gaps":["Yeast ortholog; human relevance addressed only later","Did not separate structural from adaptor roles"]},{"year":2021,"claim":"Distinguished NOP53's structural role from its exosome-recruitment role, showing it replaces Erb1 at the pre-60S foot and that the AIM is needed specifically for late ITS2 processing.","evidence":"Yeast genetics (depletion vs AIM mutants), cryo-EM-informed biochemistry, northern blot, proteomics","pmids":["34125911"],"confidence":"Medium","gaps":["Mechanism of the nucleolar-to-nuclear transition not fully defined","Yeast system"]},{"year":2021,"claim":"Detailed the autophagy-suppressive program of NOP53 via ZKSCAN3 transcriptional activation and H3-S10 dephosphorylation to downregulate ATG7/ATG12.","evidence":"Co-IP with H3, ChIP, luciferase reporter, siRNA, autophagy flux assays","pmids":["34502226"],"confidence":"Medium","gaps":["The phosphatase activity/recruitment for H3-S10 not identified","Reconciliation with pro-death autophagy report (#15) unaddressed"]},{"year":2022,"claim":"Translated the exosome-adaptor role to human cells, showing PICT1 acts at two pre-rRNA steps and that loss of its biogenesis function (or MTR4) stabilizes p53, mechanistically linking ribosome assembly to nucleolar stress signaling.","evidence":"Co-IP, AIM mutant, siRNA knockdown, northern blot, p53 western blot","pmids":["36403484"],"confidence":"Medium","gaps":["Did not separate which biogenesis defect activates p53","Single lab"]},{"year":2022,"claim":"Showed NOP53 undergoes IDR1-driven liquid-liquid phase separation, separable from M-R motif-dependent nucleolar localization, providing a biophysical basis for its nucleolar concentration.","evidence":"LLPS droplet assays (FRAP, fusion, hexanediol), IDR1 and M-R motif mutants, p53 pathway readouts","pmids":["36316314"],"confidence":"Medium","gaps":["Functional consequence of LLPS for ribosome biogenesis not directly demonstrated","Single lab"]},{"year":2024,"claim":"Identified a NOP53-MRE11 interaction in alveolar type II cells, linking NOP53 to ROS control, mitochondrial respiration, and DNA repair after cigarette smoke exposure.","evidence":"Co-IP/MS, PICT1 deletion cell model, ROS and mitochondrial respiration assays, DNA damage assays","pmids":["39578839"],"confidence":"Medium","gaps":["Direct functional role of the MRE11 interaction in repair not dissected","Single lab, single cell context"]},{"year":null,"claim":"It remains unresolved how NOP53's multiple regulatory outputs — exosome-coupled 60S biogenesis, p53/RPL11 stress signaling, NPM-MYC and PTEN control, autophagy suppression, and cytoplasmic immune modulation — are integrated and switched, including which degradation route and relocalization signal dominates under each stress.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking biogenesis defects to specific downstream effector arms","The signal hierarchy controlling nucleolar retention vs export vs degradation is undefined","Human structural data for the pre-60S role is lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,19,22]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[19]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[15]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[21]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[11,21]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,3]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[0,6,9]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[3,11,17]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[14,18]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[4,19,20,22]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,3,6,22]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,5,8,26]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[14,18]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[15,21]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,11]}],"complexes":["RNA exosome (pre-60S adaptor)","pre-60S ribosomal particle"],"partners":["RPL11","MTR4","RRP6","TP53","NPM1","PTEN","USP15","MRE11"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NZM5","full_name":"Ribosome biogenesis protein NOP53","aliases":["Glioma tumor suppressor candidate region gene 2 protein","Protein interacting with carboxyl terminus 1","PICT-1","p60"],"length_aa":478,"mass_kda":54.4,"function":"Nucleolar protein which is involved in the integration of the 5S RNP into the ribosomal large subunit during ribosome biogenesis (PubMed:24120868). In ribosome biogenesis, may also play a role in rRNA transcription (PubMed:27729611). Also functions as a nucleolar sensor that regulates the activation of p53/TP53 in response to ribosome biogenesis perturbation, DNA damage and other stress conditions (PubMed:21741933, PubMed:24120868, PubMed:27829214). DNA damage or perturbation of ribosome biogenesis disrupt the interaction between NOP53 and RPL11 allowing RPL11 transport to the nucleoplasm where it can inhibit MDM2 and allow p53/TP53 activation (PubMed:24120868, PubMed:27829214). It may also positively regulate the function of p53/TP53 in cell cycle arrest and apoptosis through direct interaction, preventing its MDM2-dependent ubiquitin-mediated proteasomal degradation (PubMed:22522597). Originally identified as a tumor suppressor, it may also play a role in cell proliferation and apoptosis by positively regulating the stability of PTEN, thereby antagonizing the PI3K-AKT/PKB signaling pathway (PubMed:15355975, PubMed:16971513, PubMed:27729611). May also inhibit cell proliferation and increase apoptosis through its interaction with NF2 (PubMed:21167305). May negatively regulate NPM1 by regulating its nucleoplasmic localization, oligomerization and ubiquitin-mediated proteasomal degradation (PubMed:25818168). Thereby, may prevent NPM1 interaction with MYC and negatively regulate transcription mediated by the MYC-NPM1 complex (PubMed:25956029). May also regulate cellular aerobic respiration (PubMed:24556985). In the cellular response to viral infection, may play a role in the attenuation of interferon-beta through the inhibition of RIGI (PubMed:27824081)","subcellular_location":"Nucleus, nucleolus; Nucleus, nucleoplasm","url":"https://www.uniprot.org/uniprotkb/Q9NZM5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/NOP53","classification":"Common Essential","n_dependent_lines":966,"n_total_lines":1208,"dependency_fraction":0.7996688741721855},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000105373","cell_line_id":"CID001056","localizations":[{"compartment":"nucleolus_gc","grade":3}],"interactors":[],"url":"https://opencell.sf.czbiohub.org/target/CID001056","total_profiled":1310},"omim":[{"mim_id":"605691","title":"RIBOSOME BIOGENESIS FACTOR NOP53; NOP53","url":"https://www.omim.org/entry/605691"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoli","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NOP53"},"hgnc":{"alias_symbol":["PICT-1","PICT1"],"prev_symbol":["GLTSCR2"]},"alphafold":{"accession":"Q9NZM5","domains":[{"cath_id":"-","chopping":"50-83","consensus_level":"medium","plddt":86.03,"start":50,"end":83},{"cath_id":"-","chopping":"412-455","consensus_level":"medium","plddt":90.8957,"start":412,"end":455}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NZM5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NZM5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NZM5-F1-predicted_aligned_error_v6.png","plddt_mean":78.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NOP53","jax_strain_url":"https://www.jax.org/strain/search?query=NOP53"},"sequence":{"accession":"Q9NZM5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NZM5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NZM5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NZM5"}},"corpus_meta":[{"pmid":"21804542","id":"PMC_21804542","title":"Regulation 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GLTSCR2, a candidate tumor suppressor, is reduced in seborrheic keratosis compared to normal skin.","date":"2010","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/20185249","citation_count":9,"is_preprint":false},{"pmid":"23532381","id":"PMC_23532381","title":"Clinical significance of PICT1 in patients of hepatocellular carcinoma with wild-type TP53.","date":"2013","source":"Annals of surgical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/23532381","citation_count":9,"is_preprint":false},{"pmid":"28286234","id":"PMC_28286234","title":"Cellular protein GLTSCR2: A valuable target for the development of broad-spectrum antivirals.","date":"2017","source":"Antiviral research","url":"https://pubmed.ncbi.nlm.nih.gov/28286234","citation_count":8,"is_preprint":false},{"pmid":"34502226","id":"PMC_34502226","title":"NOP53 Suppresses Autophagy through ZKSCAN3-Dependent and -Independent Pathways.","date":"2021","source":"International journal of molecular 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into nuclear import and nucleolar localization of yeast RNA exosome subunits","date":"2025-03-01","source":"bioRxiv","url":"https://doi.org/10.1101/2025.02.25.640171","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":25680,"output_tokens":6727,"usd":0.088972,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15733,"output_tokens":7125,"usd":0.128395,"stage2_stop_reason":"end_turn"},"total_usd":0.217367,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2011,\n      \"finding\": \"PICT1/NOP53 binds RPL11 in the nucleolus, retaining it there; loss of PICT1 releases RPL11 to the nucleoplasm where it binds MDM2, blocking MDM2-mediated ubiquitination of p53 and causing p53 accumulation and G1 arrest/apoptosis even without DNA damage.\",\n      \"method\": \"Pict1 knockout mouse/ES cells, Co-IP, cell cycle analysis, apoptosis assays, rescue experiments\",\n      \"journal\": \"Nature Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genetic knockout model with defined cellular phenotype, mechanistic rescue experiments, replicated in multiple cell types\",\n      \"pmids\": [\"21804542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PICT-1/NOP53 binds and stabilizes PTEN protein; RNAi knockdown of PICT-1 decreases endogenous PTEN, activates downstream PI3K/Akt signaling, promotes proliferation and anchorage-independent growth in a PTEN-dependent manner.\",\n      \"method\": \"RNAi knockdown, western blot, PIP3 signaling assays, soft-agar colony formation, PTEN-null cell controls\",\n      \"journal\": \"Molecular Biology of the Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (RNAi, signaling readouts, isogenic PTEN-null controls), single lab\",\n      \"pmids\": [\"16971513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GLTSCR2/NOP53 overexpression induces caspase-independent, PTEN-modulated apoptotic cell death; this cytotoxic activity is independent of its ability to phosphorylate PTEN, indicating a divergent cell death pathway.\",\n      \"method\": \"Overexpression, cell death assays, caspase activity assays, PTEN phosphorylation assays\",\n      \"journal\": \"Cell Death and Differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional overexpression with multiple readouts but single lab, mechanism not fully resolved\",\n      \"pmids\": [\"17657248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GLTSCR2/NOP53 translocates from nucleolus to nucleoplasm under ribosomal stress, where it directly interacts with and stabilizes p53, inhibiting cell cycle progression independently of ARF.\",\n      \"method\": \"Co-IP, subcellular fractionation/immunofluorescence, ARF-null cell experiments, xenograft model\",\n      \"journal\": \"Cell Death and Differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ARF-independent mechanism shown with defined genetic controls, xenograft validation, single lab\",\n      \"pmids\": [\"22522597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structure (3.2 Å) of S. cerevisiae Mtr4 bound to the arch-interacting motif (AIM) of Nop53 reveals that the KOW domain of Mtr4 recognizes AIM via hydrophobic and electrostatic interactions; NMR shows the KOW domain can simultaneously bind an AIM protein and structured RNA at adjacent surfaces.\",\n      \"method\": \"X-ray crystallography (3.2 Å), NMR, structure-function mutagenesis\",\n      \"journal\": \"RNA\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure plus NMR validation, multiple orthogonal structural methods\",\n      \"pmids\": [\"28883156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GLTSCR2/NOP53 is involved in the DNA damage response; knockdown attenuates phospho-H2AX foci formation and phosphorylation of ATM, ATR, Chk1, Chk2, and H2AX, sensitizes cells to DNA damage, delays DNA repair, and abolishes G2/M checkpoint activation.\",\n      \"method\": \"shRNA knockdown, immunofluorescence (γH2AX foci), western blot for DDR kinases, DNA repair assays, checkpoint analysis\",\n      \"journal\": \"The American Journal of Pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal readouts (foci, phosphorylation, checkpoint), single lab with defined loss-of-function phenotypes\",\n      \"pmids\": [\"21741933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Nucleolar stress inducers (actinomycin D, 5-fluorouridine, doxorubicin) cause proteasome-mediated degradation of PICT1/NOP53 in a ubiquitin-independent manner; the 20S proteasome degrades purified PICT1 in vitro; nucleolar localization is required for stress-induced degradation in cells.\",\n      \"method\": \"Proteasome inhibitors, E1 ubiquitin-activating enzyme inhibitor, genetic inactivation, in vitro 20S proteasome degradation assay, nucleoplasmic localization mutant\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted degradation assay plus cell-based mutant analysis and pharmacological validation, multiple orthogonal approaches\",\n      \"pmids\": [\"24923447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PICT-1/NOP53 interacts with the KSHV anti-apoptotic protein KS-Bcl-2; ectopic PICT-1 expression dramatically increases nucleolar localization of KS-Bcl-2 and reduces its antiapoptotic activity, while PICT-1 knockdown abolishes nucleolar targeting of KS-Bcl-2.\",\n      \"method\": \"Yeast two-hybrid screen, Co-IP, confocal microscopy, siRNA knockdown, domain mapping\",\n      \"journal\": \"Journal of Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus Co-IP plus functional consequence (antiapoptotic activity change), single lab\",\n      \"pmids\": [\"20042497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ser518-dephosphorylated (growth-inhibitory) merlin interacts with PICT-1/NOP53 in the nucleolus; PICT-1 overexpression represses cyclin D1, arrests the cell cycle at G0/G1, and promotes apoptosis; a PICT-1 C-terminal truncation mutant lacking merlin-binding has reduced growth-inhibitory effects, and merlin siRNA attenuates PICT-1-induced growth inhibition.\",\n      \"method\": \"Co-IP, confocal microscopy, dominant-negative/truncation mutants, siRNA, cell cycle analysis, cyclin D1 western blot\",\n      \"journal\": \"The International Journal of Biochemistry & Cell Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, domain mutants, siRNA rescue, multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"21167305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Nucleolar localization of PICT-1/NOP53 is mediated by two independent nucleolar localization sequences (NoLS), which are relatively long, contain arginine and leucine clusters, and have flexible boundaries; neither NoLS is sufficient alone to direct full nucleolar targeting.\",\n      \"method\": \"Confocal microscopy of EGFP/myc-tagged fusion proteins, deletion/mutation analysis of NoLS\",\n      \"journal\": \"PLoS ONE\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live imaging with systematic deletion mapping, single lab, well-controlled localization study\",\n      \"pmids\": [\"22292050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PICT-1/NOP53 self-associates to form homo-oligomers (primarily dimers, possibly higher-order), mediated by the carboxy-terminal domain, as shown by yeast two-hybrid, Co-IP, FRET in mammalian cells, in vitro microfluidic affinity assays, and glutaraldehyde cross-linking/gel filtration.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, FRET, in vitro microfluidic affinity binding, glutaraldehyde cross-linking, gel filtration\",\n      \"journal\": \"Journal of Molecular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods including in vitro reconstitution and FRET in live cells, single lab but rigorous\",\n      \"pmids\": [\"24735870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GLTSCR2/NOP53 redistributes from nucleolus to nucleoplasm where increased GLTSCR2-NPM interaction competitively inhibits NPM-MYC binary complex formation, reducing recruitment of NPM-MYC to MYC target gene promoters and suppressing MYC transcriptional and transformational activity.\",\n      \"method\": \"Co-IP, ChIP, luciferase reporter assay, anchorage-independent growth assay, confocal microscopy\",\n      \"journal\": \"The American Journal of Pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, and functional reporter assays, single lab with multiple methods\",\n      \"pmids\": [\"25956029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GLTSCR2/NOP53 induces nucleoplasmic translocation and proteasomal polyubiquitination-dependent degradation of nucleophosmin (NPM); this decreases NPM-driven cellular transformation.\",\n      \"method\": \"Co-IP, confocal microscopy, proteasome inhibitor experiments, ubiquitination assay, soft agar assay\",\n      \"journal\": \"Journal of Cellular and Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assays, functional transformation assay, single lab\",\n      \"pmids\": [\"25818168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"During DNA damage, PICT-1/NOP53 is phosphorylated by ATM (at S233 and T289), then undergoes proteasomal degradation; loss of PICT-1 releases RPL11 from the nucleolus, increasing RPL11-MDM2 binding and promoting p53 accumulation. ATM co-localizes and interacts with PICT-1 in the nucleolus.\",\n      \"method\": \"Co-IP (ATM-PICT1, Ku70-PICT1), anti-phospho-substrate antibody, site-directed mutagenesis (S233A/T289A and phosphomimetic S233D/T289D), kinase inhibitors (wortmannin, KU55933), RPL11 localization by IF\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, phosphorylation site mutagenesis, pharmacological validation, multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"27829214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"During viral infection (VSV, HSV-1), NOP53/GLTSCR2 translocates from nucleus to cytoplasm where it interacts with RIG-I and USP15; the triple interaction activates USP15 to remove K63-linked ubiquitination from RIG-I, attenuating RIG-I signaling and IFN-β production to support viral replication. Deletion of the NES of NOP53 abrogates this function.\",\n      \"method\": \"Co-IP (NOP53-RIG-I, NOP53-USP15), NES deletion mutant, IFN-β reporter assay, viral replication assays, ubiquitination assay\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional NES mutant, ubiquitination assay, viral replication readout, single lab\",\n      \"pmids\": [\"27824081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PICT-1/NOP53 overexpression triggers pro-death autophagy by directly binding ribosomal DNA (rDNA) and interacting with UBF, inhibiting UBF phosphorylation and Pol I recruitment to the rDNA promoter, thereby suppressing rRNA transcription and inactivating the AKT/mTOR/p70S6K signaling pathway.\",\n      \"method\": \"ChIP (PICT-1 on rDNA), Co-IP (PICT-1-UBF), truncation mutants, Pol I ChIP, AKT/mTOR signaling western blot, autophagy assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, Co-IP, domain mutants, multiple signaling readouts, single lab\",\n      \"pmids\": [\"27729611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"JNK activity (via phosphorylation of c-Jun) is required to maintain nucleolar localization of GLTSCR2/NOP53; inhibition of JNK by SP600125 or c-Jun peptide causes nucleoplasmic translocation of GLTSCR2 and its degradation via the proteasome-polyubiquitination pathway, mediated by reduced GLTSCR2 monomer-monomer binding affinity.\",\n      \"method\": \"Protein kinase inhibitor screen, immunocytochemistry, cycloheximide chase, ubiquitination assay, Co-IP (oligomer status)\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pharmacological inhibitor approach with multiple readouts, single lab, mechanism partially inferred\",\n      \"pmids\": [\"26903295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GLTSCR2/NOP53 binds ARF in the nucleolus and promotes ARF translocation to the nucleoplasm where it increases ARF binding to the E3 ubiquitin ligase ULF/TRIP12, enhancing ARF polyubiquitination and degradation.\",\n      \"method\": \"Co-IP (GLTSCR2-ARF, ARF-ULF), confocal microscopy (ARF localization), ubiquitination assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, localization tracking, single lab\",\n      \"pmids\": [\"27323397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NOP53/GLTSCR2 translocates to the cytoplasm during HSV-1 infection driven by viral protein γ34.5; cytoplasmic NOP53 facilitates γ34.5 recruitment of protein phosphatase PP1α to dephosphorylate eIF2α, enabling efficient viral protein translation. NOP53 knockdown impairs the γ34.5-PP1α interaction and reduces viral virulence in vivo.\",\n      \"method\": \"Co-IP (NOP53-γ34.5, γ34.5-PP1α), eIF2α phosphorylation western blot, viral yield assays, in vitro expression, mouse infection model\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, in vitro expression, in vivo mouse model, multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"29367603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Yeast Nop53 controls when the RNA exosome associates with pre-60S particles; Nop53 interacts with the exosome catalytic subunit Rrp6, Mtr4, and 25S rRNA and acts as an adaptor recruiting the exosome for 7S pre-rRNA processing to 5.8S rRNA. Proteomic analysis suggests Nop53 also positions the exosome during 7S processing.\",\n      \"method\": \"Proteomics-based interactome analysis (MS), Co-IP (Nop53-Rrp6, Nop53-Mtr4), pre-rRNA processing assays in yeast\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics plus Co-IP plus rRNA processing functional assay, single lab, yeast ortholog\",\n      \"pmids\": [\"31662437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Yeast Nop53 has a structural role in pre-60S maturation: it replaces Erb1 at the foot of the pre-60S particle, and its depletion (not just AIM mutants) blocks transition from nucleolar state E particle to nuclear stages and impairs late maturation events including Yvh1 recruitment. The AIM-exosome interaction is required specifically for late (not early) ITS2 processing.\",\n      \"method\": \"Yeast genetics (depletion, AIM mutants), cryo-EM-informed biochemical analysis, northern blot (pre-rRNA intermediates), proteomics\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic dissection with AIM mutants vs depletion, multiple pre-rRNA processing readouts, consistent with structural data, single lab\",\n      \"pmids\": [\"34125911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NOP53 suppresses autophagy through two pathways: (1) transcriptional activation of the master autophagy suppressor ZKSCAN3, inhibiting LC3B induction; and (2) physical interaction with histone H3 to dephosphorylate H3-S10, transcriptionally downregulating ATG7 and ATG12 expression.\",\n      \"method\": \"Co-IP (NOP53-H3), ChIP, luciferase reporter, siRNA knockdown, autophagy flux assays (LC3B, ATG7, ATG12 western blot)\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, reporter assay, multiple pathway readouts, single lab\",\n      \"pmids\": [\"34502226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Human PICT1/NOP53 interacts with MTR4 and the RNA exosome via an AIM sequence and is involved in two distinct pre-rRNA processing steps during 60S biogenesis: early cleavage of 32S intermediate RNA and late maturation of 12S precursor to 5.8S rRNA. AIM-dependent MTR4/exosome recruitment is required only for the late step. PICT1 or MTR4 depletion (but not exosome catalytic subunit depletion) stabilizes p53, linking the ribosome biogenesis function to nucleolar stress signaling.\",\n      \"method\": \"Co-IP (PICT1-MTR4, PICT1-exosome), AIM mutant overexpression, siRNA knockdown, northern blot (pre-rRNA intermediates), p53 western blot\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, AIM mutant analysis, pre-rRNA processing northern blot, p53 readout, single lab\",\n      \"pmids\": [\"36403484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NOP53 undergoes liquid-liquid phase separation (LLPS) in vitro and in vivo; its intrinsically disordered region 1 (IDR1) is required for phase separation, while multivalent arginine-rich linear motifs (M-R motifs) are required for nucleolar localization but dispensable for LLPS. NOP53 negatively regulates the p53 pathway in colorectal cancer cells with or without radiation.\",\n      \"method\": \"LLPS droplet assays (fusion, FRAP, 1,6-hexanediol sensitivity), IDR1 deletion mutant, M-R motif mutant, confocal microscopy, p53 pathway western blot, clonogenic survival assay\",\n      \"journal\": \"Cell Death Discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple LLPS validation criteria (FRAP, fusion, hexanediol) plus domain mutant analysis, single lab\",\n      \"pmids\": [\"36316314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PICT1/NOP53 interacts with MRE11 (a DNA damage repair factor) in alveolar type II cells; PICT1 deletion leads to increased ROS, mitochondrial dysfunction, impaired mitochondrial respiration, and impaired DNA damage repair following cigarette smoke extract exposure.\",\n      \"method\": \"Co-IP followed by mass spectrometry (identified MRE11 as novel PICT1 interactor), PICT1 deletion cell model, ROS assay, mitochondrial respiration assay, DNA damage assays\",\n      \"journal\": \"Cell Communication and Signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS identification of novel interactor plus functional KO readouts, single lab\",\n      \"pmids\": [\"39578839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GLTSCR2/PICT1 enhances mitochondrial function and is required for maintenance of oxygen consumption; its inactivation in C. elegans reduces respiration. GLTSCR2 controls cellular proliferation and metabolism via the transcription factor Myc and is induced by mitochondrial stress.\",\n      \"method\": \"High-throughput overexpression screen (flow cytometry), RNAi in C. elegans (respiration assay), Myc target gene analysis\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional screen plus C. elegans ortholog validation, multiple readouts, but mechanistic detail on Myc connection is limited in abstract\",\n      \"pmids\": [\"24556985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PICT1/NOP53 loss in gastric cancer cells causes RPL11 translocation out of the nucleolus, impairing cell proliferation and colony formation via TP53-mediated cell cycle arrest.\",\n      \"method\": \"shRNA knockdown, RPL11 immunofluorescence (localization), colony formation assay, cell cycle analysis\",\n      \"journal\": \"British Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — shRNA with defined localization and functional readouts, single lab, consistent with primary mechanism paper\",\n      \"pmids\": [\"24045667\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NOP53 (PICT1/GLTSCR2) is a nucleolar protein that retains RPL11 in the nucleolus to suppress the RPL11-MDM2-p53 axis; its loss (or stress-induced degradation/translocation) releases RPL11 to inhibit MDM2, stabilizing p53 and triggering cell cycle arrest or apoptosis. NOP53 also directly stabilizes p53 by binding it in the nucleoplasm upon ribosomal stress (ARF-independently), recruits the RNA exosome via an AIM-MTR4 interaction to process 5.8S/pre-5.8S rRNA during 60S ribosome maturation, undergoes ubiquitin-independent 20S proteasomal degradation in response to nucleolar stress (requiring nucleolar localization), self-oligomerizes via its C-terminal domain, stabilizes PTEN protein to modulate PI3K/AKT signaling, inhibits the oncogenic NPM-MYC transcriptional axis, suppresses autophagy through ZKSCAN3 and histone H3-S10 dephosphorylation, undergoes liquid-liquid phase separation via IDR1, and translocates to the cytoplasm during viral infection where it facilitates USP15-mediated deubiquitination of RIG-I to attenuate innate immune signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NOP53 (PICT1/GLTSCR2) is a nucleolar protein that couples 60S ribosome biogenesis to the surveillance pathways that govern cell proliferation, p53 stabilization, and innate immunity [#0, #22]. In its core biogenesis role it acts as an adaptor that recruits the MTR4-RNA exosome to pre-60S particles through an arch-interacting motif (AIM) recognized by the KOW domain of MTR4, directing late ITS2/pre-rRNA processing to mature 5.8S rRNA, and it additionally serves a structural role in pre-60S maturation [#4, #19, #20, #22]. NOP53 governs the nucleolar stress response: under ribosomal or genotoxic stress it redistributes from nucleolus to nucleoplasm and is degraded — either by ubiquitin-independent 20S proteasomal turnover that requires nucleolar localization [#6] or, during DNA damage, following ATM-mediated phosphorylation [#13] — releasing RPL11 to inhibit MDM2 and stabilize p53, driving G1 arrest and apoptosis [#0, #26]. NOP53 also stabilizes p53 directly by binding it in the nucleoplasm independently of ARF [#3], and disruption of its biogenesis function (loss of NOP53 or MTR4) is sufficient to trigger p53 accumulation, linking ribosome assembly to checkpoint signaling [#22]. Beyond p53, NOP53 stabilizes PTEN to restrain PI3K/AKT signaling [#1], antagonizes the oncogenic NPM-MYC transcriptional axis [#11, #12], and suppresses autophagy via ZKSCAN3 transcriptional control and histone H3-S10 dephosphorylation [#21]. Its assembly into the nucleolus is mediated by two nucleolar localization sequences and self-oligomerization through its C-terminal domain [#9, #10], and it concentrates into nucleolar condensates by liquid-liquid phase separation driven by IDR1 [#23]. During viral infection NOP53 is exported to the cytoplasm, where it promotes USP15-mediated deubiquitination of RIG-I to attenuate IFN-\\u03b2 signaling [#14] and assists HSV-1 \\u03b334.5 in recruiting PP1\\u03b1 to dephosphorylate eIF2\\u03b1 for viral translation [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established a first molecular function for NOP53 outside the nucleolus by showing it binds and stabilizes the PTEN tumor suppressor, linking it to growth-suppressive PI3K/AKT control.\",\n      \"evidence\": \"RNAi knockdown with PIP3 signaling readouts and PTEN-null isogenic controls in cultured cells\",\n      \"pmids\": [\"16971513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the structural basis or domain of the NOP53-PTEN interaction\", \"Did not connect PTEN stabilization to the later-defined nucleolar/ribosome biogenesis role\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed NOP53 overexpression drives caspase-independent, PTEN-modulated cell death distinct from its effect on PTEN phosphorylation, indicating divergent pro-death activities.\",\n      \"evidence\": \"Overexpression with cell death and caspase activity assays\",\n      \"pmids\": [\"17657248\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Death pathway not molecularly resolved\", \"Single lab, overexpression-based\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined the central nucleolar-stress mechanism: NOP53 retains RPL11 in the nucleolus, and its loss releases RPL11 to inhibit MDM2 and stabilize p53, triggering arrest/apoptosis without DNA damage.\",\n      \"evidence\": \"Pict1 knockout mouse/ES cells, reciprocal Co-IP, rescue, cell cycle and apoptosis assays\",\n      \"pmids\": [\"21804542\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address how RPL11 retention is regulated mechanistically\", \"Left open the link between RPL11 retention and ribosome biogenesis\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Implicated NOP53 in the DNA damage response, showing its loss blunts DDR kinase signaling and abolishes the G2/M checkpoint.\",\n      \"evidence\": \"shRNA knockdown with \\u03b3H2AX foci, DDR kinase phosphorylation western blots, and checkpoint analysis\",\n      \"pmids\": [\"21741933\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish whether NOP53 acts directly on DDR kinases\", \"Single lab, correlative phosphorylation readouts\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated NOP53 also stabilizes p53 directly by binding it in the nucleoplasm under ribosomal stress, defining an ARF-independent arm of p53 control.\",\n      \"evidence\": \"Co-IP, subcellular fractionation, ARF-null cell experiments, xenograft model\",\n      \"pmids\": [\"22522597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not reconcile direct p53 binding with the RPL11-MDM2 mechanism\", \"Stoichiometry and binding interface undefined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Mapped the determinants of NOP53 nucleolar targeting to two independent, non-redundant nucleolar localization sequences.\",\n      \"evidence\": \"Confocal imaging of tagged fusions with systematic NoLS deletion/mutation\",\n      \"pmids\": [\"22292050\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the nucleolar binding partners read by the NoLS\", \"No link to stress-induced relocalization\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended the RPL11-p53 mechanism to a cancer context, showing NOP53 loss in gastric cancer cells displaces RPL11 and triggers TP53-dependent arrest.\",\n      \"evidence\": \"shRNA knockdown with RPL11 immunofluorescence, colony formation, cell cycle analysis\",\n      \"pmids\": [\"24045667\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not test the pathway in patient tumors mechanistically\", \"Single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed how NOP53 protein levels are controlled under nucleolar stress: ubiquitin-independent 20S proteasomal degradation that requires nucleolar localization.\",\n      \"evidence\": \"Proteasome/E1 inhibitors, in vitro 20S degradation of purified protein, nucleoplasmic localization mutant\",\n      \"pmids\": [\"24923447\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the structural feature licensing 20S recognition\", \"Relationship to ubiquitin-dependent degradation routes unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected NOP53 to mitochondrial function and Myc-driven metabolism, showing it is required to maintain respiration.\",\n      \"evidence\": \"Overexpression screen, RNAi in C. elegans respiration assay, Myc target analysis\",\n      \"pmids\": [\"24556985\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between NOP53 and Myc left undefined\", \"Mitochondrial role not localized to a NOP53 molecular activity\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed NOP53 self-associates via its C-terminal domain to form homo-oligomers, defining a structural property relevant to its assembly and regulation.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, FRET, in vitro microfluidic affinity, cross-linking/gel filtration\",\n      \"pmids\": [\"24735870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of oligomerization for biogenesis not directly tested here\", \"Higher-order assembly state ambiguous\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified an anti-oncogenic transcriptional function: nucleoplasmic NOP53 competes with MYC for NPM, suppressing NPM-MYC target gene activation and transformation.\",\n      \"evidence\": \"Co-IP, ChIP, luciferase reporter, anchorage-independent growth assay\",\n      \"pmids\": [\"25956029\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish in vivo relevance of NPM competition\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed NOP53 additionally promotes proteasomal, ubiquitination-dependent degradation of NPM, reinforcing its suppression of NPM-driven transformation.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, proteasome inhibitor experiments, soft agar assay\",\n      \"pmids\": [\"25818168\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase for NPM not identified\", \"Relationship to the competitive NPM-MYC mechanism unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the DNA-damage trigger for NOP53 turnover: ATM phosphorylates NOP53 (S233/T289), driving its proteasomal degradation and RPL11 release to stabilize p53.\",\n      \"evidence\": \"Co-IP, phospho-site mutagenesis, kinase inhibitors, RPL11 localization by IF\",\n      \"pmids\": [\"27829214\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not reconcile with the ubiquitin-independent 20S degradation route\", \"Direct ATM kinase assay on NOP53 not shown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked an upstream kinase signal to NOP53 localization, showing JNK/c-Jun activity maintains nucleolar NOP53 by sustaining monomer-monomer binding, with inhibition causing translocation and degradation.\",\n      \"evidence\": \"Kinase inhibitor screen, immunocytochemistry, cycloheximide chase, ubiquitination and oligomer Co-IP\",\n      \"pmids\": [\"26903295\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism partly inferred from pharmacology\", \"Direct JNK target site on NOP53 not mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Added a transcription-coupled autophagy arm, showing NOP53 binds rDNA and UBF to repress Pol I recruitment and rRNA transcription, inactivating AKT/mTOR and inducing pro-death autophagy.\",\n      \"evidence\": \"ChIP on rDNA, Co-IP with UBF, truncation mutants, signaling western blots, autophagy assays\",\n      \"pmids\": [\"27729611\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression-driven phenotype\", \"Relationship to its exosome-recruitment biogenesis role not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established a viral immune-evasion function: cytoplasmic NOP53 bridges RIG-I and USP15 to remove K63-ubiquitin from RIG-I, dampening IFN-\\u03b2 and aiding viral replication.\",\n      \"evidence\": \"Co-IP, NES deletion mutant, IFN-\\u03b2 reporter, ubiquitination and viral replication assays\",\n      \"pmids\": [\"27824081\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"What signals NOP53 nuclear export during infection not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved the structural basis of NOP53-exosome recruitment, showing the MTR4 KOW domain recognizes the NOP53 AIM and can simultaneously engage AIM protein and RNA.\",\n      \"evidence\": \"3.2 \\u00c5 X-ray crystallography of Mtr4-AIM, NMR, structure-function mutagenesis (yeast)\",\n      \"pmids\": [\"28883156\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure determined for yeast orthologs\", \"Did not capture the full pre-60S context of the interaction\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed NOP53 promotes ARF translocation and ULF/TRIP12-dependent degradation, adding another node by which NOP53 shapes the p53 regulatory network.\",\n      \"evidence\": \"Co-IP, ARF localization microscopy, ubiquitination assay\",\n      \"pmids\": [\"27323397\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation with NOP53's ARF-independent p53 stabilization unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a second viral mechanism, with cytoplasmic NOP53 enabling HSV-1 \\u03b334.5 recruitment of PP1\\u03b1 to dephosphorylate eIF2\\u03b1 and sustain viral translation.\",\n      \"evidence\": \"Co-IP, eIF2\\u03b1 phosphorylation western blot, viral yield assays, mouse infection model\",\n      \"pmids\": [\"29367603\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the same export pathway is used as in RIG-I attenuation not tested\", \"Host consequence in uninfected cells unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established NOP53 as the adaptor that times RNA exosome association with pre-60S particles, interacting with Rrp6, Mtr4 and 25S rRNA to drive 7S\\u21925.8S processing.\",\n      \"evidence\": \"Proteomic interactome, Co-IP, pre-rRNA processing assays in yeast\",\n      \"pmids\": [\"31662437\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Yeast ortholog; human relevance addressed only later\", \"Did not separate structural from adaptor roles\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Distinguished NOP53's structural role from its exosome-recruitment role, showing it replaces Erb1 at the pre-60S foot and that the AIM is needed specifically for late ITS2 processing.\",\n      \"evidence\": \"Yeast genetics (depletion vs AIM mutants), cryo-EM-informed biochemistry, northern blot, proteomics\",\n      \"pmids\": [\"34125911\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of the nucleolar-to-nuclear transition not fully defined\", \"Yeast system\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Detailed the autophagy-suppressive program of NOP53 via ZKSCAN3 transcriptional activation and H3-S10 dephosphorylation to downregulate ATG7/ATG12.\",\n      \"evidence\": \"Co-IP with H3, ChIP, luciferase reporter, siRNA, autophagy flux assays\",\n      \"pmids\": [\"34502226\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The phosphatase activity/recruitment for H3-S10 not identified\", \"Reconciliation with pro-death autophagy report (#15) unaddressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Translated the exosome-adaptor role to human cells, showing PICT1 acts at two pre-rRNA steps and that loss of its biogenesis function (or MTR4) stabilizes p53, mechanistically linking ribosome assembly to nucleolar stress signaling.\",\n      \"evidence\": \"Co-IP, AIM mutant, siRNA knockdown, northern blot, p53 western blot\",\n      \"pmids\": [\"36403484\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not separate which biogenesis defect activates p53\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed NOP53 undergoes IDR1-driven liquid-liquid phase separation, separable from M-R motif-dependent nucleolar localization, providing a biophysical basis for its nucleolar concentration.\",\n      \"evidence\": \"LLPS droplet assays (FRAP, fusion, hexanediol), IDR1 and M-R motif mutants, p53 pathway readouts\",\n      \"pmids\": [\"36316314\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of LLPS for ribosome biogenesis not directly demonstrated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a NOP53-MRE11 interaction in alveolar type II cells, linking NOP53 to ROS control, mitochondrial respiration, and DNA repair after cigarette smoke exposure.\",\n      \"evidence\": \"Co-IP/MS, PICT1 deletion cell model, ROS and mitochondrial respiration assays, DNA damage assays\",\n      \"pmids\": [\"39578839\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct functional role of the MRE11 interaction in repair not dissected\", \"Single lab, single cell context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how NOP53's multiple regulatory outputs — exosome-coupled 60S biogenesis, p53/RPL11 stress signaling, NPM-MYC and PTEN control, autophagy suppression, and cytoplasmic immune modulation — are integrated and switched, including which degradation route and relocalization signal dominates under each stress.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking biogenesis defects to specific downstream effector arms\", \"The signal hierarchy controlling nucleolar retention vs export vs degradation is undefined\", \"Human structural data for the pre-60S role is lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 19, 22]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [15]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [11, 21]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [0, 6, 9]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [3, 11, 17]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14, 18]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [4, 19, 20, 22]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 3, 6, 22]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 5, 8, 26]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [14, 18]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [15, 21]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 11]}\n    ],\n    \"complexes\": [\"RNA exosome (pre-60S adaptor)\", \"pre-60S ribosomal particle\"],\n    \"partners\": [\"RPL11\", \"MTR4\", \"RRP6\", \"TP53\", \"NPM1\", \"PTEN\", \"USP15\", \"MRE11\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}