{"gene":"NPRL2","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":2009,"finding":"Yeast Npr2 and Npr3 form a heterodimer complex that is required for inactivation of TORC1 in response to amino acid starvation, but not carbon starvation or rapamycin; the human homologs NPRL2 and NPRL3 also co-immunoprecipitate, indicating the complex is evolutionarily conserved. Loss of Npr2/Npr3 prevents dephosphorylation of TORC1 effector Npr1 and fails to activate transcription factors Gln3/Gat1 upon amino acid starvation.","method":"Genome-wide reverse genetic screen (flow cytometry-based reporter), biochemical purification, co-immunoprecipitation of yeast and human homologs","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — genome-wide screen + biochemical purification + co-IP of human homologs, replicated across yeast and human","pmids":["19521502"],"is_preprint":false},{"year":2000,"finding":"NPRL2/Gene21 was identified as a candidate tumor suppressor gene residing in the ~630-kb lung cancer homozygous deletion region on chromosome 3p21.3; the gene encodes a protein with sequence homology to yeast NPR2 and contains a bipartite nuclear localization signal, a protein-binding domain, and similarity to the MutS core domain.","method":"Homozygous deletion mapping, genomic sequencing, transcript mapping, sequence analysis","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 — sequence/deletion analysis, single study identifying gene structure","pmids":["11085536"],"is_preprint":false},{"year":2002,"finding":"Forced adenovirus-mediated expression of wild-type NPRL2 in 3p21.3-deficient lung cancer cells (H1299, A549) significantly inhibited tumor cell growth by inducing apoptosis and altering cell cycle processes; systemic administration also suppressed tumor xenograft growth and inhibited lung metastases in nude mice.","method":"Adenovirus-mediated gene transfer, in vitro proliferation and apoptosis assays, in vivo xenograft and metastasis models","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function/gain-of-function with defined cellular and in vivo phenotypes, single lab","pmids":["11980673"],"is_preprint":false},{"year":2004,"finding":"NPRL2/G21 functions as a tumor suppressor: it has inactivating mutations in renal, lung, and cervical carcinoma cell lines, tet-controlled NPRL2 transgenes suppress tumor cell growth on plastic dishes, and NPRL2 suppresses tumor formation in SCID mice. The protein contains a nuclear localization signal and a nitrogen permease regulator 2 domain.","method":"Mutation screening, tet-controlled transgene expression, growth suppression assay, SCID mouse tumor formation assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple cancer models + in vivo suppression, single lab","pmids":["15374952"],"is_preprint":false},{"year":2003,"finding":"Disruption of yeast NPR2 confers resistance to cisplatin and cross-resistance to doxorubicin, without altering drug accumulation. NPR2 and SKY1 (SR-protein-specific kinase) are epistatic for cisplatin/doxorubicin sensitivity, placing NPR2 in the same pathway as SKY1 for mediating cytotoxicity of these anticancer drugs.","method":"Clonogenic survival assays, double-knockout epistasis analysis, drug accumulation measurement","journal":"Molecular pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with defined drug-resistance phenotype in yeast model","pmids":["12869630"],"is_preprint":false},{"year":2006,"finding":"Restoration of NPRL2 expression in NPRL2-negative, cisplatin-resistant non-small-cell lung cancer cells resensitizes them to cisplatin, resulting in ~40% greater inhibition of viability and 2–3-fold increase in apoptosis via caspase activation. Combination treatment with NPRL2 nanoparticles and cisplatin overcame cisplatin resistance in an orthotopic mouse model.","method":"Nanoparticle-mediated gene transfer, cell viability assays, apoptosis (caspase activation) assays, orthotopic mouse model","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro + in vivo with mechanistic readout (caspase activation), single lab","pmids":["17018626"],"is_preprint":false},{"year":2008,"finding":"TUSC4/NPRL2 physically interacts with PDK1 via its N-terminal 133 amino acids and suppresses Src-dependent tyrosine phosphorylation and activation of PDK1 in vitro and in cells. Deletion of the N-terminal domain abolishes the inhibitory effect, demonstrating that complex formation is required for TUSC4-mediated PDK1 inactivation. TUSC4 silencing promotes cell proliferation; ectopic TUSC4 inactivates PDK1 downstream signaling including Akt and p70 S6 kinase.","method":"E. coli two-hybrid screening, co-immunoprecipitation, in vitro kinase assay, domain deletion analysis, siRNA knockdown","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP + in vitro assay + domain mutagenesis, single lab","pmids":["18616680"],"is_preprint":false},{"year":2010,"finding":"NPRL2 sensitizes non-small-cell lung cancer cells to cisplatin by activating the DNA damage checkpoint pathway: NPRL2 promotes phosphorylation of ATM and downstream γ-H2AX formation, increases Chk1 and Chk2 kinase activity, upregulates Cdc25A and Cdc25C, and leads to G2/M cell cycle arrest. NPRL2 + cisplatin combination activates Chk2 in pleural metastases xenografts in mice.","method":"Gene transfer, Western blotting for checkpoint proteins, kinase activity assays, cell cycle analysis (flow cytometry), in vivo xenograft model","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods demonstrating checkpoint activation, in vitro + in vivo, single lab","pmids":["20700484"],"is_preprint":false},{"year":2011,"finding":"In yeast, Iml1p, Npr2p, and Npr3p form a complex (Iml1p-Npr2p-Npr3p) that is selectively required for non-nitrogen-starvation-induced autophagy. During this autophagy, Iml1p localizes to preautophagosomal structures (PAS) or non-PAS puncta, and loss of any complex member strongly impairs autophagosome formation. A conserved domain in Iml1p is required for both autophagy induction and complex formation.","method":"Visual screen in yeast deletion collection, ultrastructural analysis (EM), live-cell imaging of PAS localization, domain deletion analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — genetic screen + EM ultrastructure + live imaging, multiple orthogonal methods","pmids":["21900499"],"is_preprint":false},{"year":2013,"finding":"GATOR1, composed of DEPDC5, NPRL2, and NPRL3, is a GTPase-activating protein (GAP) for RagA and RagB that negatively regulates the amino acid-sensing branch of the mTORC1 pathway. Inhibition of GATOR1 subunits makes mTORC1 signaling resistant to amino acid deprivation; GATOR1 components are mutated in human cancer. In cancer cells with inactivating GATOR1 mutations, mTORC1 is hyperactive and insensitive to amino acid starvation.","method":"Affinity purification/mass spectrometry, GAP activity assay for RagA/B, siRNA knockdown, epistasis analysis with GATOR2, cancer mutation analysis","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — in vitro GAP assay + MS interactome + epistasis + cancer mutation analysis, foundational study replicated widely","pmids":["23723238"],"is_preprint":false},{"year":2014,"finding":"In yeast, Npr2-Npr3 function upstream of Gtr1-Gtr2 (Rag GTPase homologs) to inactivate TORC1 and induce autophagy. Npr2-Npr3 promote GDP loading of Gtr1 (RagA homolog), and Gtr2 (RagC homolog) directly binds the TORC1 subunit Kog1 (Raptor homolog). GDP-bound Gtr1 induces autophagy in a manner dependent on direct Gtr2-Kog1 binding. The mammalian homologs NPRL2 and NPRL3 were also shown to be involved in regulation of autophagy.","method":"Genetic screen, epistasis analysis with Gtr1/Gtr2 mutants, localization studies (vacuole), binding assays (Gtr2-Kog1 interaction)","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis + binding assays + mammalian validation, multiple orthogonal methods","pmids":["25046117"],"is_preprint":false},{"year":2014,"finding":"In Drosophila, Nprl2 and Nprl3 physically interact and localize to lysosomes and autolysosomes. They inhibit TORC1 signaling in the female germline in response to amino acid starvation, and this inhibition is critical for female fertility. Nprl2/3 work in concert with Tsc1/2 to fine-tune TORC1 activity, and Tsc1 is a critical downstream effector of Akt1 in the germline.","method":"Co-immunoprecipitation, immunofluorescence localization to lysosomes/autolysosomes, genetic loss-of-function, TORC1 signaling readouts in oogenesis","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — Co-IP + localization + genetic epistasis in metazoan model","pmids":["24786828"],"is_preprint":false},{"year":2014,"finding":"Yeast Npr2 inhibits TORC1 to prevent inappropriate utilization of glutamine for biosynthesis of nitrogen-containing metabolites. Npr2-deficient yeast metabolize glutamine into nitrogenous metabolites and maintain high S-adenosyl methionine (SAM) levels instead of accumulating glutamine as wild-type cells do under nutrient-limited conditions. Methionine supplementation stimulates glutamine consumption for nitrogenous metabolite synthesis in wild-type yeast, demonstrating integration of sulfur amino acid signals with nitrogen utilization via the Npr2 complex.","method":"Metabolomics (NMR/MS), genetic analysis of Npr2-deficient yeast, nutrient supplementation experiments","journal":"Science signaling","confidence":"Medium","confidence_rationale":"Tier 2 — metabolomics + genetic analysis, single lab","pmids":["25515537"],"is_preprint":false},{"year":2015,"finding":"NPRL2 mutations cause familial focal epilepsy in humans; NPRL2 mutations make mTOR signaling resistant to amino acid deprivation, and some patients have focal epilepsy associated with brain malformations. Together with NPRL3 and DEPDC5 mutations (all GATOR1 components), GATOR1 gene mutations are the most significant cause of familial focal epilepsy identified to date.","method":"Targeted capture and next-generation sequencing of 404 epilepsy patients, exome sequencing of two families, linkage analysis","journal":"Annals of neurology","confidence":"Medium","confidence_rationale":"Tier 3 — genetic association with mechanistic context from prior biochemical studies; human genetics","pmids":["26505888"],"is_preprint":false},{"year":2015,"finding":"NPRL2 is required for mouse viability and fetal liver hematopoiesis. NPRL2 KO embryos have reduced methionine levels and defective cobalamin (vitamin B12) processing: NPRL2 KO liver and MEFs show impaired lysosomal acidification, defective processing of the cobalamin-transport protein transcobalamin 2, and impaired cobalamin-dependent methionine synthesis from homocysteine. Supplementation with cyanocobalamin rescues the methionine synthesis defect.","method":"Conditional knockout mice, metabolomics (methionine levels), lysosomal acidification assays, transcobalamin 2 processing assays, cyanocobalamin rescue","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — KO mouse model + metabolomics + rescue experiment, multiple orthogonal methods","pmids":["26166573"],"is_preprint":false},{"year":2015,"finding":"NPRL2 interacts with Raptor (mTORC1 subunit) in an amino acid-dependent manner to positively regulate mTORC1 activity. In amino acid sufficiency, NPRL2 binds Raptor to activate mTORC1; in amino acid scarcity, NPRL2 preferentially binds the dominant-negative RagA(GDP)/RagD(GTP) heterodimer to inhibit mTORC1. NPRL2 localizes predominantly to lysosomal membranes. A 'seesaw' model is proposed in which NPRL2 binding to Raptor vs. Rag GTPases determines mTORC1 activation state.","method":"Co-immunoprecipitation with Raptor and Rag GTPase mutants, lysosomal localization (immunofluorescence), Drosophila in vivo validation","journal":"Cellular signalling","confidence":"Low","confidence_rationale":"Tier 3 — single Co-IP study; seesaw model partially conflicts with dominant GATOR1 literature showing NPRL2 as purely inhibitory","pmids":["26582740"],"is_preprint":false},{"year":2010,"finding":"Yeast Npr2 is a phosphoprotein and target of the SCF(Grr1) E3 ubiquitin ligase. Phosphorylated Npr2 accumulates in grr1Δ mutants; Npr2 is stabilized by proteasome inactivation. Phosphorylation-dependent instability depends on casein kinases Yck1 and Yck2. Npr2 is required for robust growth on ammonium or urea nitrogen sources and for efficient meiosis completion.","method":"Mass spectrometry identification, genetic analysis of grr1Δ/proteasome mutants, casein kinase deletion analysis, growth assays on defined nitrogen sources","journal":"Eukaryotic cell","confidence":"Medium","confidence_rationale":"Tier 2 — MS identification + genetic epistasis + phosphorylation analysis, single lab","pmids":["20154027"],"is_preprint":false},{"year":2018,"finding":"Cryo-EM structures of GATOR1 and GATOR1-Rag GTPase complexes reveal that GATOR1 adopts an extended architecture with a central cavity; NPRL2 serves as a linker between DEPDC5 and NPRL3. The NPRL2-NPRL3 heterodimer contacts RagA to execute GAP activity (GTP hydrolysis stimulation), while DEPDC5 contacts the Rag heterodimer in an inhibitory mode. At least two binding modes exist between Rag GTPases and GATOR1.","method":"Cryo-electron microscopy, biochemical GAP activity assays, co-immunoprecipitation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure + biochemical GAP assay, landmark structural study","pmids":["29590090"],"is_preprint":false},{"year":2019,"finding":"Arg-78 of NPRL2 is the arginine finger that catalyzes GATOR1's GAP function (stimulated GTP hydrolysis by RagA). Substitution of Arg-78 renders mTORC1 signaling insensitive to amino acid starvation. This residue is frequently mutated in cancers such as glioblastoma. The GAP mode of GATOR1-Rag interaction is distinct from the inhibitory mode previously captured structurally.","method":"Site-directed mutagenesis, in vitro GTP hydrolysis assays, co-immunoprecipitation, structural analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted GTP hydrolysis assay + mutagenesis of catalytic residue + structural validation","pmids":["30651352"],"is_preprint":false},{"year":2017,"finding":"Overexpression of NPRL2 in cells with active p53 induces NOX2-dependent production of reactive oxygen species and DNA damage; overexpressed NPRL2 accumulates in the nucleus together with apoptosis-inducing factor (AIF). These events are accompanied by p53 phosphorylation, DNA damage response activation, and G1 arrest followed by apoptosis. In p53-negative cells, NPRL2 overexpression leads to CHK1 or CHK2 activation and G2/M arrest. These functions are distinct from NPRL2's role in mTORC1 regulation.","method":"Overexpression in multiple cell lines, ROS measurement, nuclear fractionation/localization, co-localization with AIF, flow cytometry for cell cycle, Western blotting for DNA damage markers","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (ROS, localization, cell cycle), single lab","pmids":["29127423"],"is_preprint":false},{"year":2018,"finding":"NPRL2 enhances autophagy in castration-resistant prostate cancer (CRPC) and promotes resistance to Everolimus (an mTOR inhibitor). NPRL2 silencing increases mTOR signaling activity, attenuates autophagy, and increases apoptosis in Everolimus-treated CRPC cells. In xenograft mouse models, NPRL2-silenced tumors show increased sensitivity to Everolimus associated with autophagy attenuation and apoptosis.","method":"siRNA knockdown, Western blotting for mTOR/autophagy markers, apoptosis assays, xenograft mouse model","journal":"The Prostate","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined phenotype in vitro and in vivo, single lab","pmids":["30178500"],"is_preprint":false},{"year":2014,"finding":"TUSC4/NPRL2 functions as a tumor suppressor by physically interacting with the E3 ligase HERC2, which prevents BRCA1 degradation through the ubiquitination pathway. TUSC4/NPRL2 silencing enhances BRCA1 polyubiquitination and degradation, leading to marked reduction in homologous recombination repair efficiency. TUSC4 silencing was sufficient to transform normal mammary epithelial cells and enhance sensitivity to PARP inhibitors.","method":"Global expression analysis, Co-immunoprecipitation (TUSC4-HERC2 interaction), ubiquitination assay, HR repair efficiency assay, in vitro transformation, in vivo tumorigenesis","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP + ubiquitination assay + functional HR readout, single lab","pmids":["25480944"],"is_preprint":false},{"year":2016,"finding":"In fission yeast, Npr2-Npr3 (NPRL2-NPRL3 homologs) function together with Lam2 (LAMTOR2 homolog) as a tether for GDP-bound Gtr1 to the vacuolar membrane, thereby suppressing TORC1 activity. Loss of Lam2, Gtr1, Gtr2, Npr2, or Npr3 all disinhibit TORC1 under nitrogen depletion. Lam2 physically interacts with Npr2 and Gtr1.","method":"Genetic phenocopy analysis, TORC1 activity assay (Rps6 phosphorylation), co-immunoprecipitation (Lam2-Npr2-Gtr1), localization studies","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP + genetic epistasis + localization, single lab in fission yeast","pmids":["27227887"],"is_preprint":false},{"year":2022,"finding":"Conditional deletion of Nprl2 from mouse dorsal telencephalon (Emx1-Cre) causes spontaneous seizures and dysmorphic enlarged neuronal cells with increased mTORC1 signaling, recapitulating features of human GATORopathy. Chronic rapamycin administration dramatically prolonged survival and inhibited seizures, but rapamycin benefit after withdrawal was less durable in Nprl2-cKO than Depdc5-cKO mice.","method":"Conditional knockout mice (Cre-lox), EEG seizure monitoring, histological analysis of neuronal morphology, mTORC1 signaling assays (phospho-S6), rapamycin treatment","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — conditional KO mouse with multiple mechanistic readouts + pharmacological rescue","pmids":["34965576"],"is_preprint":false},{"year":2022,"finding":"Loss of NPRL2 expression in mouse excitatory glutamatergic neurons causes seizures and early lethality consistent with SUDEP. NPRL2 deficiency increases mTORC1-dependent signaling, alters brain amino acid homeostasis, reduces dendritic branching, and increases action potential strength. Loss of NPRL2 elevates expression of epilepsy-linked voltage-gated sodium channel Scn1A in neurons, and this upregulation is prevented by rapamycin treatment, placing Scn1A regulation downstream of NPRL2-mTORC1.","method":"Neuron-specific conditional knockout, electrophysiology (action potential recordings), sodium channel expression (Western blot/qPCR), rapamycin rescue, metabolomics (amino acid profiling)","journal":"eNeuro","confidence":"High","confidence_rationale":"Tier 2 — conditional KO + electrophysiology + pharmacological rescue with specific mechanistic readout (Scn1A), multiple orthogonal methods","pmids":["35165201"],"is_preprint":false},{"year":2022,"finding":"NPRL2 down-regulation in HCC increases Rag GTPase and mTOR activation and inhibits autophagy in vitro and in vivo. NPRL2 knockdown reduces expression of NPRL3 and DEPDC5 (the other GATOR1 subunits), suggesting NPRL2 stabilizes the complex. NPRL2-silenced cells showed enhanced proliferation, migration, and colony formation.","method":"siRNA/shRNA knockdown, subcutaneous and orthotopic xenograft mouse models, Western blotting for mTOR/Rag/autophagy markers","journal":"Hepatology communications","confidence":"Medium","confidence_rationale":"Tier 2 — KD + in vitro + in vivo with defined mechanistic readouts, single lab","pmids":["36321403"],"is_preprint":false},{"year":2019,"finding":"Loss of Nprl2 in Drosophila decreases lifespan, causes age-related digestive dysfunction (distended crop, food accumulation, decreased crop contraction, short gut length, high intestinal stem cell proliferation), and metabolic dysfunction. All age-related phenotypes are rescued by decreasing TORC1 activity, demonstrating that Nprl2-mediated TORC1 inhibition protects against digestive tract senescence.","method":"Nprl2 loss-of-function mutation in Drosophila, lifespan assays, intestinal morphology and function assays, TORC1 inhibition rescue (rapamycin/genetic)","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with phenotypic rescue by TORC1 inhibition in Drosophila","pmids":["31712450"],"is_preprint":false},{"year":2021,"finding":"In a mouse model with neocortical loss of Nprl2, increased mTORC1 signaling produces spontaneous seizures with excitatory/inhibitory imbalance (increased EPSC, decreased IPSC frequencies). Proteomic and metabolomic analyses reveal increases in glycine levels, and glycine actions on NMDA receptors contribute to both electrophysiological and survival phenotypes. This identifies glycine-NMDA receptor signaling as a downstream consequence of NPRL2 loss and mTORC1 hyperactivation.","method":"Conditional Nprl2 KO mouse, electrophysiology (patch clamp), proteomics, metabolomics (glycine measurement), pharmacological manipulation of NMDA receptors","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 — conditional KO + electrophysiology + proteomics + metabolomics + pharmacological rescue, multiple orthogonal methods","pmids":["35602938"],"is_preprint":false},{"year":2021,"finding":"E2F1 binds to the NPRL2 promoter and activates its transcription in prostate cancer cells. FOXO1 interacts with E2F1 and weakens E2F1 binding to the NPRL2 promoter, thereby suppressing NPRL2 transcription and inhibiting prostate cancer cell proliferation. NPRL2 inhibition significantly reduces E2F1-enhanced cell proliferation.","method":"ChIP-seq data analysis (Cistrome), dual-luciferase assay, ChIP-qPCR, co-immunoprecipitation (FOXO1-E2F1), cell proliferation/colony formation assays","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-qPCR + dual-luciferase + Co-IP + functional rescue, single lab","pmids":["34459063"],"is_preprint":false},{"year":2021,"finding":"NPRL2 interacts with UBE2M (a neddylation E2 enzyme), and this interaction increases NPRL2 protein stability by reducing its polyubiquitination and proteasomal degradation. NPRL2 cooperatively enhances UBE2M-mediated neddylation, facilitating degradation of substrates of Cullin-RING E3 ubiquitin ligases (CRLs). Depletion of NPRL2 or UBE2M significantly increases sensitivity of CRPC cells to the PARP inhibitor niraparib.","method":"Co-immunoprecipitation (NPRL2-UBE2M), immunofluorescence, ubiquitination assay, neddylation assay, in vitro and in vivo drug sensitivity assays","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP validated by bioinformatics + ubiquitination/neddylation assays, single lab","pmids":["33905671"],"is_preprint":false},{"year":2025,"finding":"NPRL2 gene therapy in humanized mice bearing KRAS/STK11/anti-PD1-resistant NSCLC tumors reduces lung metastases significantly, correlating with increased infiltration of cytotoxic T cells and HLA-DR+ DCs, and decreased regulatory T cells and MDSCs. Stable NPRL2 expression downregulates MAPK and AKT-mTOR signaling and increases colony-formation inhibition and carboplatin sensitivity. CD8-T cell, macrophage, and CD4-T cell depletion abolishes the antitumor effect. IFNγ, CD8b, TBX21 are increased; FOXP3, TGFB1/B2, IL-10RA, and T-cell co-inhibitory molecules are downregulated.","method":"Humanized mouse model (CD34+ stem cell transplant), in vivo tumor growth assays, immune cell depletion experiments, flow cytometry of TME immune populations, protein expression profiling","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 — multiple in vivo experiments with immune depletion validation, single lab","pmids":["39932765"],"is_preprint":false},{"year":2024,"finding":"NPRL2 promotes TRIM16 expression (via inactivation of ERK1/2), and TRIM16 mediates ubiquitination-dependent degradation of Galectin-3 (Gal-3), reducing Gal-3 secretion from glioma cells. Secreted Gal-3 triggers copper uptake and cuproptosis in CD8+ T cells; NPRL2 expression thus protects CD8+ T cells from Gal-3-mediated cuproptosis and increases their recruitment. Clinical samples show NPRL2 positively correlates with TRIM16 and negatively correlates with Gal-3 and CD8+ T cell accumulation.","method":"Overexpression/knockdown experiments, co-immunoprecipitation (NPRL2-TRIM16), ubiquitination assays, cuproptosis assays in CD8+ T cells, immunohistochemistry of clinical glioma specimens","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP + ubiquitination assay + functional immune readout, single lab","pmids":["39367988"],"is_preprint":false},{"year":2016,"finding":"GATOR1 components including NPRL2 are mutated in focal epilepsies associated with focal cortical dysplasia; brain tissue from patients with NPRL2 mutations shows hyperactivation of the mTORC1 pathway as measured by phospho-S6 immunoreactivity.","method":"Targeted sequencing of GATOR1/GATOR2 genes, phospho-S6 immunohistochemistry in resected brain tissue","journal":"Epilepsia","confidence":"Medium","confidence_rationale":"Tier 3 — tissue-based mTORC1 readout in human brain, mechanistically consistent with GATOR1 function","pmids":["27173016"],"is_preprint":false}],"current_model":"NPRL2 is a core subunit of the GATOR1 complex (with DEPDC5 and NPRL3) that acts as a GTPase-activating protein (GAP) for RagA/RagB GTPases, with Arg-78 of NPRL2 serving as the catalytic arginine finger; GATOR1 inhibits mTORC1 by promoting GTP hydrolysis on RagA in response to amino acid starvation, and loss of NPRL2 causes constitutive mTORC1 hyperactivation, leading to impaired autophagy, seizures (via sodium channel Scn1A upregulation and glycine-NMDA receptor dysregulation), disrupted hematopoiesis and lysosomal cobalamin processing, and tumor suppression defects including impaired DNA damage checkpoint signaling (via ATM-Chk1/Chk2), PDK1 inhibition, HERC2-BRCA1 stabilization, and UBE2M-mediated neddylation regulation."},"narrative":{"teleology":[{"year":2000,"claim":"Identification of NPRL2 as a candidate tumor suppressor in a recurrently deleted 3p21.3 region established the gene's potential relevance to lung cancer biology and provided initial structural annotation including homology to yeast NPR2.","evidence":"Homozygous deletion mapping and sequence analysis in lung cancer cell lines","pmids":["11085536"],"confidence":"Medium","gaps":["No functional data demonstrating tumor suppressor activity","Homology to yeast NPR2 not yet mechanistically exploited"]},{"year":2002,"claim":"Ectopic expression of NPRL2 inhibited lung cancer cell growth and suppressed xenograft tumors, providing the first functional evidence for tumor suppressor activity.","evidence":"Adenovirus-mediated gene transfer in NPRL2-deficient lung cancer cells, xenograft and metastasis models in nude mice","pmids":["11980673","15374952"],"confidence":"Medium","gaps":["Mechanism of growth suppression unknown","No molecular target or pathway identified"]},{"year":2009,"claim":"Discovery that yeast Npr2-Npr3 form a conserved complex required for TORC1 inactivation upon amino acid starvation linked NPRL2 to the TOR signaling pathway for the first time.","evidence":"Genome-wide reverse genetic screen, co-immunoprecipitation of yeast and human NPRL2-NPRL3 heterodimer","pmids":["19521502"],"confidence":"High","gaps":["Mechanism of TORC1 inhibition (direct vs. indirect) unknown","Mammalian pathway components not yet defined"]},{"year":2010,"claim":"NPRL2 was shown to activate the ATM-Chk1/Chk2 DNA damage checkpoint pathway and sensitize cancer cells to cisplatin, revealing a role in DNA damage signaling distinct from nutrient sensing.","evidence":"Western blotting for checkpoint kinases, kinase activity assays, cell cycle analysis, in vivo xenograft","pmids":["20700484","17018626"],"confidence":"Medium","gaps":["Whether DNA damage signaling is mTORC1-dependent or independent not resolved","Direct molecular mechanism linking NPRL2 to ATM activation unknown"]},{"year":2013,"claim":"The landmark identification of GATOR1 (DEPDC5-NPRL2-NPRL3) as a GAP for RagA/RagB unified NPRL2's tumor suppressor and nutrient-sensing roles by placing it as a direct negative regulator of mTORC1's amino acid sensing arm.","evidence":"Affinity purification/mass spectrometry, in vitro GAP activity assay, siRNA epistasis with GATOR2, cancer mutation analysis","pmids":["23723238"],"confidence":"High","gaps":["Catalytic mechanism and which residue provides GAP activity unknown","Structural basis of GATOR1-Rag interaction unresolved"]},{"year":2014,"claim":"Multiple studies established that the NPRL2-NPRL3 heterodimer acts upstream of Rag GTPases in both yeast and Drosophila to regulate autophagy and TORC1, and revealed additional roles in nitrogen metabolism and BRCA1 stability via HERC2 interaction.","evidence":"Yeast genetic epistasis with Gtr1/Gtr2, Drosophila lysosomal localization and oogenesis phenotypes, Co-IP of NPRL2-HERC2 and HR repair assays","pmids":["25046117","24786828","25480944","25515537"],"confidence":"High","gaps":["HERC2-BRCA1 mechanism not confirmed as mTORC1-dependent or independent","Autophagy role in mammalian NPRL2 loss not yet characterized in vivo"]},{"year":2015,"claim":"NPRL2 knockout mice revealed essential roles in embryonic viability, fetal liver hematopoiesis, and lysosomal cobalamin processing, demonstrating that GATOR1-mTORC1 regulation has metabolic consequences beyond canonical mTOR signaling, and human genetic studies established NPRL2 mutations as a cause of familial focal epilepsy.","evidence":"Conditional KO mice with metabolomics and cyanocobalamin rescue; targeted sequencing of 404 epilepsy patients with linkage analysis","pmids":["26166573","26505888"],"confidence":"High","gaps":["How mTORC1 hyperactivation disrupts lysosomal acidification mechanistically unclear","Genotype-phenotype correlations for different NPRL2 epilepsy mutations not established"]},{"year":2018,"claim":"Cryo-EM structures of GATOR1 revealed that NPRL2 serves as the architectural linker between DEPDC5 and NPRL3, and the NPRL2-NPRL3 heterodimer directly contacts RagA for GAP activity, resolving the structural basis of GATOR1 function.","evidence":"Cryo-EM at sub-4Å resolution with biochemical GAP assays","pmids":["29590090"],"confidence":"High","gaps":["Catalytic residue not yet identified","Transition between inhibitory and GAP binding modes not mechanistically resolved"]},{"year":2019,"claim":"Identification of Arg-78 as the catalytic arginine finger of NPRL2 defined the atomic mechanism of GATOR1's GAP activity and explained why this residue is recurrently mutated in cancer.","evidence":"Site-directed mutagenesis of Arg-78, in vitro GTP hydrolysis assays, mTORC1 signaling readouts","pmids":["30651352"],"confidence":"High","gaps":["Full catalytic cycle and conformational changes during GAP reaction not structurally captured","Cancer-associated mutations beyond Arg-78 not functionally characterized"]},{"year":2022,"claim":"Neuron-specific Nprl2 knockout mouse models revealed that mTORC1 hyperactivation causes seizures through specific downstream effectors including upregulation of the voltage-gated sodium channel Scn1A and glycine-NMDA receptor dysregulation, identifying tractable therapeutic targets.","evidence":"Conditional KO in glutamatergic neurons and dorsal telencephalon, electrophysiology, rapamycin rescue of Scn1A upregulation, metabolomics identifying glycine accumulation, NMDA receptor pharmacology","pmids":["35165201","35602938","34965576"],"confidence":"High","gaps":["Whether Scn1A and glycine pathways are independent or converging downstream of mTORC1 is unclear","Cell-type-specific consequences of NPRL2 loss in inhibitory neurons not addressed"]},{"year":2024,"claim":"NPRL2 was linked to regulation of the tumor immune microenvironment through TRIM16-mediated Galectin-3 degradation preventing CD8+ T cell cuproptosis, and gene therapy in humanized mice showed NPRL2 restores anti-tumor immunity in KRAS/STK11-mutant NSCLC.","evidence":"Co-IP and ubiquitination assays for NPRL2-TRIM16-Gal-3 axis; humanized mouse models with immune cell depletion experiments","pmids":["39367988","39932765"],"confidence":"Medium","gaps":["TRIM16-Gal-3 axis not confirmed as mTORC1-dependent","Whether immune-modulatory effects are separable from cell-autonomous tumor suppression not resolved","Single-lab findings awaiting independent replication"]},{"year":null,"claim":"Key open questions include the structural basis of the GATOR1 GAP catalytic cycle at atomic resolution, the mechanistic relationship between NPRL2's mTORC1-dependent and apparently mTORC1-independent functions (DNA damage, HERC2-BRCA1, UBE2M-neddylation), and whether therapeutic mTORC1 inhibition can substitute for NPRL2 loss across all disease contexts.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full catalytic cycle structure of GATOR1 engaged with RagA-GTP","mTORC1-independent functions lack reconstitution with purified components","Genotype-phenotype relationships for clinical NPRL2 variants remain limited"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[9,17,18]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[17]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[11,15]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,19]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[9,10,17,18]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[8,10,11,20]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,3,13,23,32]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,9,12,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,5,19]}],"complexes":["GATOR1"],"partners":["DEPDC5","NPRL3","RRAGA","RPTOR","HERC2","UBE2M","PDK1","TRIM16"],"other_free_text":[]},"mechanistic_narrative":"NPRL2 is a core subunit of the GATOR1 complex (with DEPDC5 and NPRL3) that functions as a GTPase-activating protein (GAP) for RagA/RagB GTPases to negatively regulate mTORC1 signaling in response to amino acid availability, thereby controlling autophagy, cell growth, and metabolic homeostasis. Cryo-EM structures show NPRL2 bridges DEPDC5 and NPRL3 within GATOR1, and Arg-78 of NPRL2 serves as the catalytic arginine finger essential for stimulating GTP hydrolysis on RagA [PMID:29590090, PMID:30651352]. Loss of NPRL2 causes constitutive mTORC1 hyperactivation, leading to impaired autophagy, defective lysosomal cobalamin processing, disrupted hematopoiesis, and spontaneous seizures with excitatory/inhibitory imbalance attributable in part to mTORC1-dependent upregulation of Scn1A and glycine-NMDA receptor dysregulation [PMID:26166573, PMID:35165201, PMID:35602938]. Germline NPRL2 mutations cause familial focal epilepsy with focal cortical dysplasia in humans, and somatic inactivation across multiple cancer types identifies NPRL2 as a tumor suppressor that promotes DNA damage checkpoint signaling and cisplatin sensitivity [PMID:26505888, PMID:20700484, PMID:23723238]."},"prefetch_data":{"uniprot":{"accession":"Q8WTW4","full_name":"GATOR1 complex protein NPRL2","aliases":["Gene 21 protein","G21 protein","Nitrogen permease regulator 2-like protein","NPR2-like protein","Tumor suppressor candidate 4"],"length_aa":380,"mass_kda":43.7,"function":"Catalytic component of the GATOR1 complex, a multiprotein complex that functions as an inhibitor of the amino acid-sensing branch of the mTORC1 pathway (PubMed:23723238, PubMed:29590090, PubMed:35338845, PubMed:38006878). In response to amino acid depletion, the GATOR1 complex has GTPase activating protein (GAP) activity and strongly increases GTP hydrolysis by RagA/RRAGA (or RagB/RRAGB) within heterodimeric Rag complexes, thereby turning them into their inactive GDP-bound form, releasing mTORC1 from lysosomal surface and inhibiting mTORC1 signaling (PubMed:23723238, PubMed:29590090, PubMed:35338845). In the presence of abundant amino acids, the GATOR1 complex is ubiquitinated and inhibited by GATOR2 (PubMed:23723238, PubMed:36528027). Within the GATOR1 complex, NPRL2 constitutes the catalytic subunit that mediates the GTPase activator activity and under methionine-sufficient conditions, the GTPase activator activity is inhibited by PRMT1 through methylation and consequently inducing timely mTORC1 activation (PubMed:27173016, PubMed:30651352, PubMed:35338845) Suppresses Src-dependent tyrosine phosphorylation and activation of PDPK1 and its downstream signaling (PubMed:18616680). Down-regulates PDPK1 kinase activity by interfering with tyrosine phosphorylation at 'Tyr-9', 'Tyr-373' and 'Tyr-376' residues (PubMed:18616680). May act as a tumor suppressor (PubMed:18616680). Suppresses cell growth and enhances sensitivity to various anticancer drugs (PubMed:18616680)","subcellular_location":"Lysosome membrane","url":"https://www.uniprot.org/uniprotkb/Q8WTW4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NPRL2","classification":"Not Classified","n_dependent_lines":22,"n_total_lines":1208,"dependency_fraction":0.018211920529801324},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NPRL2","total_profiled":1310},"omim":[{"mim_id":"620307","title":"WD REPEAT-CONTAINING PROTEIN 24; WDR24","url":"https://www.omim.org/entry/620307"},{"mim_id":"617418","title":"WD REPEAT-CONTAINING PROTEIN 59; WDR59","url":"https://www.omim.org/entry/617418"},{"mim_id":"617118","title":"EPILEPSY, FAMILIAL FOCAL, WITH VARIABLE FOCI 3; FFEVF3","url":"https://www.omim.org/entry/617118"},{"mim_id":"617116","title":"EPILEPSY, FAMILIAL FOCAL, WITH VARIABLE FOCI 2; FFEVF2","url":"https://www.omim.org/entry/617116"},{"mim_id":"615359","title":"MEIOSIS REGULATOR FOR OOCYTE DEVELOPMENT; MIOS","url":"https://www.omim.org/entry/615359"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NPRL2"},"hgnc":{"alias_symbol":["NPR2L","NPR2"],"prev_symbol":["TUSC4"]},"alphafold":{"accession":"Q8WTW4","domains":[{"cath_id":"3.30.450","chopping":"6-157","consensus_level":"high","plddt":73.5825,"start":6,"end":157},{"cath_id":"-","chopping":"243-325","consensus_level":"medium","plddt":71.386,"start":243,"end":325},{"cath_id":"-","chopping":"327-378","consensus_level":"high","plddt":59.5269,"start":327,"end":378},{"cath_id":"1.10.10","chopping":"172-236","consensus_level":"medium","plddt":76.6062,"start":172,"end":236}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WTW4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WTW4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WTW4-F1-predicted_aligned_error_v6.png","plddt_mean":69.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NPRL2","jax_strain_url":"https://www.jax.org/strain/search?query=NPRL2"},"sequence":{"accession":"Q8WTW4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8WTW4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8WTW4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WTW4"}},"corpus_meta":[{"pmid":"20947764","id":"PMC_20947764","title":"Granulosa 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interactions.","date":"2017","source":"Nature biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/28319085","citation_count":378,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25263562","id":"PMC_25263562","title":"The Sestrins interact with GATOR2 to negatively regulate the amino-acid-sensing pathway upstream of mTORC1.","date":"2014","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/25263562","citation_count":353,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21822266","id":"PMC_21822266","title":"Exome sequencing supports a de novo mutational paradigm for schizophrenia.","date":"2011","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21822266","citation_count":348,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"28199306","id":"PMC_28199306","title":"KICSTOR recruits GATOR1 to the lysosome and is necessary for nutrients to regulate mTORC1.","date":"2017","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/28199306","citation_count":270,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21900206","id":"PMC_21900206","title":"A directed protein interaction network for investigating intracellular signal transduction.","date":"2011","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/21900206","citation_count":258,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"30093711","id":"PMC_30093711","title":"The landscape of epilepsy-related GATOR1 variants.","date":"2018","source":"Genetics in medicine : official journal of the American College of Medical Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30093711","citation_count":183,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"31601708","id":"PMC_31601708","title":"Structural basis for the docking of mTORC1 on the lysosomal surface.","date":"2019","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/31601708","citation_count":166,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"28199315","id":"PMC_28199315","title":"SZT2 dictates GATOR control of mTORC1 signalling.","date":"2017","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/28199315","citation_count":159,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"29590090","id":"PMC_29590090","title":"Architecture of the human GATOR1 and GATOR1-Rag GTPases complexes.","date":"2018","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/29590090","citation_count":158,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"1922062","id":"PMC_1922062","title":"Cloning and expression of two human p70 S6 kinase polypeptides differing only at their amino termini.","date":"1991","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/1922062","citation_count":156,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32941802","id":"PMC_32941802","title":"A Cellular Mechanism to Detect and Alleviate Reductive Stress.","date":"2020","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/32941802","citation_count":156,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"22578813","id":"PMC_22578813","title":"Translational homeostasis via the mRNA cap-binding protein, eIF4E.","date":"2012","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/22578813","citation_count":151,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11980673","id":"PMC_11980673","title":"Expression of several genes in the human chromosome 3p21.3 homozygous deletion region by an adenovirus vector results in tumor suppressor activities in vitro and in vivo.","date":"2002","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/11980673","citation_count":147,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"27173016","id":"PMC_27173016","title":"Involvement of GATOR complex genes in familial focal epilepsies and focal cortical dysplasia.","date":"2016","source":"Epilepsia","url":"https://pubmed.ncbi.nlm.nih.gov/27173016","citation_count":140,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"31601764","id":"PMC_31601764","title":"Architecture of human Rag GTPase heterodimers and their complex with mTORC1.","date":"2019","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/31601764","citation_count":117,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18029348","id":"PMC_18029348","title":"Toward a confocal subcellular atlas of the human proteome.","date":"2007","source":"Molecular & cellular proteomics : 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The Npr2/3 complex mediates an amino acid starvation signal to TORC1, and cells lacking NPR2/NPR3 fail to inactivate TORC1 in response to amino acid starvation (not carbon starvation or rapamycin), demonstrating specificity for amino acid sensing.\",\n      \"method\": \"Biochemical purification, co-immunoprecipitation (yeast and human), genetic deletion with TORC1 reporter assay, rapamycin rescue epistasis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP in both yeast and human cells plus epistasis; replicated across organisms in single rigorous study\",\n      \"pmids\": [\"19521502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The yeast Iml1-Npr2-Npr3 complex (SEACIT) functions as a single complex required selectively for non-nitrogen-starvation (NNS)-induced autophagy; Iml1 localizes to preautophagosomal structures and the complex is required for autophagosome formation under NNS conditions.\",\n      \"method\": \"Genetic deletion screen, live-cell fluorescence imaging of Iml1 localization, electron microscopy of autophagosomes, complex formation assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genetics, imaging, EM) in single study; strong mechanistic resolution\",\n      \"pmids\": [\"21900499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast Npr2-Npr3 function upstream of the Gtr1-Gtr2 (RagA/C homolog) GTPase complex to promote GTP hydrolysis on Gtr1, switching it to the GDP-bound state; GDP-bound Gtr1 enables Gtr2-GTP to bind directly to TORC1 subunit Kog1, thereby inactivating TORC1 and inducing autophagy.\",\n      \"method\": \"Genetic epistasis with GTPase nucleotide-state mutants, Co-immunoprecipitation (Gtr2-Kog1 interaction), vacuolar localization assays of Tor1\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis plus reciprocal Co-IP with mechanistic resolution of two sequential steps\",\n      \"pmids\": [\"25046117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Arg-78 of NPRL2 is the arginine finger catalytic residue that executes GATOR1's GAP (GTPase-activating protein) function toward RagA. Substitution of Arg-78 renders mTORC1 signaling insensitive to amino acid starvation, and cancer-associated mutations at this residue abolish GAP activity.\",\n      \"method\": \"Site-directed mutagenesis, in vitro GTP hydrolysis assays, co-immunoprecipitation, structural analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstituted GTP hydrolysis assay plus mutagenesis plus structural analysis in single study\",\n      \"pmids\": [\"30651352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Drosophila Nprl2 and Nprl3 physically interact and localize to lysosomes and autolysosomes; they inhibit TORC1 signaling in the female germline in response to amino acid starvation, and this inhibition is critical for preservation of female fertility during nutrient scarcity. Nprl2/3 work in concert with Tsc1/2 to fine-tune TORC1 activity.\",\n      \"method\": \"Co-immunoprecipitation, subcellular localization imaging (lysosome/autolysosome), genetic loss-of-function in Drosophila oogenesis, epistasis with Tsc1/2\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus imaging plus genetic epistasis in metazoan model; Drosophila ortholog of mammalian NPRL2\",\n      \"pmids\": [\"24786828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NPRL2 is a requisite subunit of the GATOR1 complex (with DEPDC5 and NPRL3), which acts as a negative regulator of mTORC1 in response to amino acid insufficiency. NPRL2 knockout in mice is lethal and causes defective fetal liver hematopoiesis, impaired lysosomal acidification and cobalamin processing, and reduced methionine synthesis.\",\n      \"method\": \"Mouse knockout, metabolomics (methionine/homocysteine), lysosomal pH measurements, cobalamin processing assays in KO liver and MEFs, rescue by cyanocobalamin supplementation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple defined cellular and metabolic phenotypes and rescue experiment\",\n      \"pmids\": [\"26166573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NPRL2/G21 encodes a soluble protein with a bipartite nuclear localization signal, a protein-binding domain, similarity to the MutS core domain, and an NPR2 domain; it suppresses tumor cell growth and tumor formation in SCID mice, and is inactivated by homozygous deletions in renal, lung, and cervical cancer cell lines.\",\n      \"method\": \"Sequence analysis, tetracycline-controlled transgene expression growth suppression assay on plastic and in SCID mice, homozygous deletion screening\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vivo tumor suppression with genetic evidence; mechanism partly inferred from sequence features\",\n      \"pmids\": [\"15374952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NPRL2/TUSC4 physically interacts with PDK1 (3-phosphoinositide-dependent protein kinase-1) through its N-terminal 133 amino acids and suppresses Src-dependent tyrosine phosphorylation and activation of PDK1 in vitro and in cells; the interaction is required for PDK1 inactivation, and TUSC4 silencing activates the PDK1-Akt-p70S6K pathway.\",\n      \"method\": \"E. coli two-hybrid screening, co-immunoprecipitation, in vitro PDK1 kinase assay with mutagenesis, siRNA knockdown, Western blotting of downstream signaling\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus in vitro kinase assay with domain deletion mutants; single lab\",\n      \"pmids\": [\"18616680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In yeast, Npr2 is a phosphoprotein targeted by casein kinases Yck1/Yck2, and phosphorylated Npr2 is degraded by the SCF(Grr1) E3 ubiquitin ligase complex; Npr2 interacts with the F-box protein Grr1 and accumulates in grr1Δ mutants or upon proteasome inhibition.\",\n      \"method\": \"Mass spectrometry (MudPIT), co-immunoprecipitation with Grr1, proteasome inhibitor stabilization, yeast genetics (CK1 and Grr1 mutants)\",\n      \"journal\": \"Eukaryotic cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS identification plus genetic and biochemical validation; single lab but multiple methods\",\n      \"pmids\": [\"20154027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast Npr2 inhibits TORC1 to prevent inappropriate utilization of glutamine for biosynthesis of nitrogen-containing metabolites; in Npr2-deficient yeast, glutamine is metabolized into nitrogenous metabolites and S-adenosyl methionine (SAM) levels remain high rather than declining as in wild-type under nutrient limitation.\",\n      \"method\": \"Metabolomics of Npr2-deficient yeast, genetic rescue, methionine supplementation experiments\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — metabolomics with genetic controls; single lab, multiple metabolic measurements\",\n      \"pmids\": [\"25515537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NPRL2 interacts with Raptor (mTORC1 component) in amino acid sufficiency to promote mTORC1 activity, while interacting with RagD GTPase in amino acid scarcity to inhibit mTORC1; a reciprocal 'seesaw' relationship exists between NPRL2 binding to RagD vs. Raptor, and NPRL2 localizes predominantly to lysosomal membranes.\",\n      \"method\": \"Co-immunoprecipitation with Rag GTPase mutants and Raptor, subcellular fractionation/localization, Drosophila genetic epistasis\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP plus localization; proposed 'seesaw' model contradicts the established GAP-mode inhibitory function described by Shen et al. 2019; single lab, single method per interaction\",\n      \"pmids\": [\"26582740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Disruption of yeast NPR2 confers resistance to cisplatin and cross-resistance to doxorubicin; NPR2 and SKY1 (SR-protein kinase) are epistatic for cisplatin and doxorubicin resistance, placing NPR2 in the same pathway as SKY1 for drug cytotoxicity.\",\n      \"method\": \"Genetic deletion, clonogenic survival assays, double-knockout epistasis, cellular drug accumulation assays\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis established by double-knockout showing no additive effect; single lab but rigorous genetic approach\",\n      \"pmids\": [\"12869630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Restoration of NPRL2 expression in NPRL2-negative cisplatin-resistant NSCLC cells activates ATM kinase phosphorylation, promotes downstream γ-H2AX formation, increases Chk1 and Chk2 kinase activity, elevates Cdc25A/Cdc25C expression, and causes G2/M cell cycle arrest, thereby re-sensitizing cells to cisplatin.\",\n      \"method\": \"NPRL2 gene transfer (nanoparticle), Western blotting of DNA-damage checkpoint proteins, cell cycle analysis, in vivo orthotopic xenograft model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function with multiple mechanistic readouts in vitro and in vivo; single lab\",\n      \"pmids\": [\"20700484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Overexpressed NPRL2 accumulates in the nucleus and induces NOX2-dependent reactive oxygen species production and DNA damage in a p53-dependent manner; in p53-active cells this leads to p53 phosphorylation, apoptosis-inducing factor (AIF) nuclear accumulation, and G1 cell cycle arrest followed by apoptosis; in p53-negative cells it activates CHK1/CHK2 and causes S or G2/M arrest.\",\n      \"method\": \"Overexpression in mammalian cells, ROS measurement (NOX2 dependence confirmed by inhibition), subcellular fractionation, co-localization with AIF, flow cytometry, Western blotting\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal assays (ROS, localization, cell cycle) with genetic context (p53 status); single lab\",\n      \"pmids\": [\"29127423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Conditional deletion of Nprl2 in mouse excitatory glutamatergic neurons causes spontaneous seizures and early death; loss of NPRL2 increases mTORC1 signaling, alters brain amino acid homeostasis, reduces dendritic branching, and elevates voltage-gated sodium channel Scn1A expression in an mTORC1-dependent manner (rapamycin prevents Scn1A upregulation).\",\n      \"method\": \"Conditional knockout mice, electrophysiology (action potential recordings), rapamycin rescue, Western blotting of sodium channels and mTORC1 substrates, amino acid metabolomics\",\n      \"journal\": \"eNeuro\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with multiple orthogonal phenotypes, pharmacological rescue establishing mTORC1 dependence\",\n      \"pmids\": [\"35165201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Conditional deletion of Nprl2 in mouse dorsal telencephalon causes spontaneous seizures, dysmorphic enlarged neuronal cells with increased mTORC1 complex 1 signaling, similar to DEPDC5-cKO mice; chronic rapamycin administration suppresses seizures and prolongs survival but does not normalize enlarged neurons.\",\n      \"method\": \"Conditional knockout mice (Emx1-Cre), EEG seizure monitoring, histological analysis, mTORC1 signaling assays (phospho-S6 etc.), rapamycin pharmacological intervention\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with in vivo seizure recording, cellular morphology, and mTORC1 signaling quantification plus pharmacological rescue\",\n      \"pmids\": [\"34965576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In a neocortical Nprl2 loss-of-function mouse model, loss of NPRL2 increases mTORC1 signaling and elevates glycine levels; glycine acting on NMDA receptors contributes to abnormal synaptic function (increased EPSCs, decreased IPSCs) and early mortality, identifying a metabolic-synaptic mechanism for NPRL2-related epilepsy.\",\n      \"method\": \"Neocortical Nprl2 conditional KO, electrophysiology (evoked/spontaneous EPSC and IPSC), proteomics, metabolomics, pharmacological NMDA receptor manipulation\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with electrophysiology plus metabolomics plus pharmacological rescue; multiple orthogonal methods\",\n      \"pmids\": [\"35602938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In fission yeast, loss of Npr2 or Npr3 phenocopies loss of Gtr1 or Gtr2 (Rag GTPase homologs) and disinhibits TORC1 under nitrogen depletion; Lam2 (LAMTOR2 homolog) physically interacts with Npr2 and Gtr1, and Lam2/Npr2-Npr3 together tether GDP-bound Gtr1 to the vacuolar membrane to suppress TORC1.\",\n      \"method\": \"Fission yeast genetics, Co-immunoprecipitation (Lam2-Npr2, Lam2-Gtr1), vacuolar localization imaging, TORC1 activity assay (Rps6 phosphorylation)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus localization plus genetic epistasis; single lab in fission yeast ortholog\",\n      \"pmids\": [\"27227887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NPRL2/TUSC4 physically interacts with the E3 ubiquitin ligase Herc2, preventing BRCA1 polyubiquitination and proteasomal degradation; TUSC4 silencing enhances BRCA1 ubiquitination, reduces BRCA1 levels, and impairs homologous recombination repair.\",\n      \"method\": \"Global expression analysis, co-immunoprecipitation (TUSC4-Herc2), ubiquitination assay, HR repair efficiency assay, KD and OE phenotypic readouts\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional ubiquitination assay plus HR repair readout; single lab\",\n      \"pmids\": [\"25480944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NPRL2 interacts with UBE2M (neddylation E2 enzyme), and this interaction stabilizes NPRL2 by reducing its polyubiquitination and proteasomal degradation; NPRL2 cooperatively enhances UBE2M-mediated neddylation and facilitates degradation of Cullin-RING E3 ligase substrates, thereby modulating drug sensitivity in castration-resistant prostate cancer.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, ubiquitination assays, neddylation assays, siRNA knockdown, in vivo xenograft\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP plus functional neddylation assay; single lab, moderate mechanistic depth\",\n      \"pmids\": [\"33905671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NPRL2 increases TRIM16 expression (via inactivation of ERK1/2 signaling), which promotes ubiquitination-mediated degradation of Galectin-3; reduced Galectin-3 secretion from glioma cells decreases copper uptake and cuproptosis in CD8+ T lymphocytes, thereby sustaining anti-tumor immune activity.\",\n      \"method\": \"Co-immunoprecipitation (NPRL2-TRIM16), ubiquitination assay, Western blotting of ERK1/2, copper uptake assay, flow cytometry of CD8+ T cell cuproptosis, clinical specimen correlation\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP plus functional assays; novel pathway with single lab reporting\",\n      \"pmids\": [\"39367988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"E2F1 transcription factor binds the NPRL2 promoter and activates its transcription; FOXO1 interacts with E2F1 and weakens E2F1 binding to the NPRL2 promoter, thereby reducing NPRL2 expression and suppressing prostate cancer cell proliferation.\",\n      \"method\": \"Dual-luciferase reporter assay, ChIP-qPCR (E2F1 binding to NPRL2 promoter), co-immunoprecipitation (FOXO1-E2F1), cell proliferation assays\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-qPCR plus luciferase plus Co-IP; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"34459063\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NPRL2 is a core subunit of the GATOR1 complex (with DEPDC5 and NPRL3) that acts as a GAP for RagA GTPases via its catalytic Arg-78 arginine finger, thereby inhibiting mTORC1 on the lysosomal surface in response to amino acid insufficiency; additionally, NPRL2 has mTORC1-independent functions including suppression of PDK1 tyrosine phosphorylation, stabilization of BRCA1 through interaction with the Herc2 E3 ligase, induction of NOX2-dependent ROS and DNA-damage signaling, and regulation of sodium channel expression, collectively explaining its roles as a tumor suppressor and an epilepsy gene.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries only from KEEP papers.\n\n**Classification:**\n- Papers [1]-[4], [6]-[10], [12]-[15], [19], [21]-[22], [25]-[27], [30]-[35], [37]-[38] (NPR2/NPR1 as natriuretic peptide receptor): EXCLUDE — these are about the receptor tyrosine kinase/guanylyl cyclase NPR2 (natriuretic peptide receptor B), not NPRL2\n- Papers [1] (corpus #1, NPPC/NPR2 meiosis), [3], [4], [6]-[10], [12]-[15], [19] (NPR2 short stature), etc.: EXCLUDE — alias collision with NPR2 (natriuretic peptide receptor)\n- Papers about NPRL2 (nitrogen permease regulator-like 2, GATOR1 component): KEEP\n\nLet me carefully go through each:\n\n**KEEP** (canonical NPRL2/GATOR1): corpus [2], [5], [11], [16], [17], [18], [20], [23], [24], [28], [29], [31], [32], [36], [38], [40], [48], [51], [52], [59], [64], [70], [72], [74], [75], [78], [80], [85], [88], [89], [91], [95], [98], [99]\n\nAdditional papers [1]-[11] from gene2pubmed: [5] (GATOR1 GAP activity), [19] (GATOR1 epilepsy landscape), [22] (GATOR1 architecture), [27] (GATOR involvement in epilepsy), [28], [30] also relevant.\n\n**EXCLUDE** (NPR2 natriuretic peptide receptor): corpus [1], [3], [4], [6], [7], [8], [9], [10], [12], [13], [14], [15], [19] (short stature), [21] (NPR2 novel allele), [22] (NPR2 cn/cn), [25], [26], [27] (NPR2 meiosis), [30] (bovine NPR2), [33], [34], [35], [37], [39], [41], [43], [44], [45], [46], [47], [50], [53], [54], [55], [56], [57] (TUSC4 in colon — but wait, [38] and [57] mention TUSC4=NPRL2), [58], [61], [62], [63], [65], [66], [67], [71], [73], [76], [77], [79], [81], [82] (grass carp npr2), [83], [84], [86], [87], [90], [92], [93], [94], [96], [97], [100]\n\nNote: [38] (TUSC4/NPRL2 - BRCA1) — TUSC4 is another name for NPRL2, KEEP.\n[40] (TUSC4/NPRL2 - PDK1) — KEEP.\n[57] (TUSC4/colon) — KEEP (TUSC4=NPRL2).\n\nNow extracting:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"Yeast Npr2 and Npr3 form a heterodimer complex that is required for inactivation of TORC1 in response to amino acid starvation, but not carbon starvation or rapamycin; the human homologs NPRL2 and NPRL3 also co-immunoprecipitate, indicating the complex is evolutionarily conserved. Loss of Npr2/Npr3 prevents dephosphorylation of TORC1 effector Npr1 and fails to activate transcription factors Gln3/Gat1 upon amino acid starvation.\",\n      \"method\": \"Genome-wide reverse genetic screen (flow cytometry-based reporter), biochemical purification, co-immunoprecipitation of yeast and human homologs\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide screen + biochemical purification + co-IP of human homologs, replicated across yeast and human\",\n      \"pmids\": [\"19521502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"NPRL2/Gene21 was identified as a candidate tumor suppressor gene residing in the ~630-kb lung cancer homozygous deletion region on chromosome 3p21.3; the gene encodes a protein with sequence homology to yeast NPR2 and contains a bipartite nuclear localization signal, a protein-binding domain, and similarity to the MutS core domain.\",\n      \"method\": \"Homozygous deletion mapping, genomic sequencing, transcript mapping, sequence analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — sequence/deletion analysis, single study identifying gene structure\",\n      \"pmids\": [\"11085536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Forced adenovirus-mediated expression of wild-type NPRL2 in 3p21.3-deficient lung cancer cells (H1299, A549) significantly inhibited tumor cell growth by inducing apoptosis and altering cell cycle processes; systemic administration also suppressed tumor xenograft growth and inhibited lung metastases in nude mice.\",\n      \"method\": \"Adenovirus-mediated gene transfer, in vitro proliferation and apoptosis assays, in vivo xenograft and metastasis models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function/gain-of-function with defined cellular and in vivo phenotypes, single lab\",\n      \"pmids\": [\"11980673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NPRL2/G21 functions as a tumor suppressor: it has inactivating mutations in renal, lung, and cervical carcinoma cell lines, tet-controlled NPRL2 transgenes suppress tumor cell growth on plastic dishes, and NPRL2 suppresses tumor formation in SCID mice. The protein contains a nuclear localization signal and a nitrogen permease regulator 2 domain.\",\n      \"method\": \"Mutation screening, tet-controlled transgene expression, growth suppression assay, SCID mouse tumor formation assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple cancer models + in vivo suppression, single lab\",\n      \"pmids\": [\"15374952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Disruption of yeast NPR2 confers resistance to cisplatin and cross-resistance to doxorubicin, without altering drug accumulation. NPR2 and SKY1 (SR-protein-specific kinase) are epistatic for cisplatin/doxorubicin sensitivity, placing NPR2 in the same pathway as SKY1 for mediating cytotoxicity of these anticancer drugs.\",\n      \"method\": \"Clonogenic survival assays, double-knockout epistasis analysis, drug accumulation measurement\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with defined drug-resistance phenotype in yeast model\",\n      \"pmids\": [\"12869630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Restoration of NPRL2 expression in NPRL2-negative, cisplatin-resistant non-small-cell lung cancer cells resensitizes them to cisplatin, resulting in ~40% greater inhibition of viability and 2–3-fold increase in apoptosis via caspase activation. Combination treatment with NPRL2 nanoparticles and cisplatin overcame cisplatin resistance in an orthotopic mouse model.\",\n      \"method\": \"Nanoparticle-mediated gene transfer, cell viability assays, apoptosis (caspase activation) assays, orthotopic mouse model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro + in vivo with mechanistic readout (caspase activation), single lab\",\n      \"pmids\": [\"17018626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TUSC4/NPRL2 physically interacts with PDK1 via its N-terminal 133 amino acids and suppresses Src-dependent tyrosine phosphorylation and activation of PDK1 in vitro and in cells. Deletion of the N-terminal domain abolishes the inhibitory effect, demonstrating that complex formation is required for TUSC4-mediated PDK1 inactivation. TUSC4 silencing promotes cell proliferation; ectopic TUSC4 inactivates PDK1 downstream signaling including Akt and p70 S6 kinase.\",\n      \"method\": \"E. coli two-hybrid screening, co-immunoprecipitation, in vitro kinase assay, domain deletion analysis, siRNA knockdown\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP + in vitro assay + domain mutagenesis, single lab\",\n      \"pmids\": [\"18616680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NPRL2 sensitizes non-small-cell lung cancer cells to cisplatin by activating the DNA damage checkpoint pathway: NPRL2 promotes phosphorylation of ATM and downstream γ-H2AX formation, increases Chk1 and Chk2 kinase activity, upregulates Cdc25A and Cdc25C, and leads to G2/M cell cycle arrest. NPRL2 + cisplatin combination activates Chk2 in pleural metastases xenografts in mice.\",\n      \"method\": \"Gene transfer, Western blotting for checkpoint proteins, kinase activity assays, cell cycle analysis (flow cytometry), in vivo xenograft model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods demonstrating checkpoint activation, in vitro + in vivo, single lab\",\n      \"pmids\": [\"20700484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In yeast, Iml1p, Npr2p, and Npr3p form a complex (Iml1p-Npr2p-Npr3p) that is selectively required for non-nitrogen-starvation-induced autophagy. During this autophagy, Iml1p localizes to preautophagosomal structures (PAS) or non-PAS puncta, and loss of any complex member strongly impairs autophagosome formation. A conserved domain in Iml1p is required for both autophagy induction and complex formation.\",\n      \"method\": \"Visual screen in yeast deletion collection, ultrastructural analysis (EM), live-cell imaging of PAS localization, domain deletion analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic screen + EM ultrastructure + live imaging, multiple orthogonal methods\",\n      \"pmids\": [\"21900499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GATOR1, composed of DEPDC5, NPRL2, and NPRL3, is a GTPase-activating protein (GAP) for RagA and RagB that negatively regulates the amino acid-sensing branch of the mTORC1 pathway. Inhibition of GATOR1 subunits makes mTORC1 signaling resistant to amino acid deprivation; GATOR1 components are mutated in human cancer. In cancer cells with inactivating GATOR1 mutations, mTORC1 is hyperactive and insensitive to amino acid starvation.\",\n      \"method\": \"Affinity purification/mass spectrometry, GAP activity assay for RagA/B, siRNA knockdown, epistasis analysis with GATOR2, cancer mutation analysis\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro GAP assay + MS interactome + epistasis + cancer mutation analysis, foundational study replicated widely\",\n      \"pmids\": [\"23723238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In yeast, Npr2-Npr3 function upstream of Gtr1-Gtr2 (Rag GTPase homologs) to inactivate TORC1 and induce autophagy. Npr2-Npr3 promote GDP loading of Gtr1 (RagA homolog), and Gtr2 (RagC homolog) directly binds the TORC1 subunit Kog1 (Raptor homolog). GDP-bound Gtr1 induces autophagy in a manner dependent on direct Gtr2-Kog1 binding. The mammalian homologs NPRL2 and NPRL3 were also shown to be involved in regulation of autophagy.\",\n      \"method\": \"Genetic screen, epistasis analysis with Gtr1/Gtr2 mutants, localization studies (vacuole), binding assays (Gtr2-Kog1 interaction)\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis + binding assays + mammalian validation, multiple orthogonal methods\",\n      \"pmids\": [\"25046117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In Drosophila, Nprl2 and Nprl3 physically interact and localize to lysosomes and autolysosomes. They inhibit TORC1 signaling in the female germline in response to amino acid starvation, and this inhibition is critical for female fertility. Nprl2/3 work in concert with Tsc1/2 to fine-tune TORC1 activity, and Tsc1 is a critical downstream effector of Akt1 in the germline.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence localization to lysosomes/autolysosomes, genetic loss-of-function, TORC1 signaling readouts in oogenesis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP + localization + genetic epistasis in metazoan model\",\n      \"pmids\": [\"24786828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast Npr2 inhibits TORC1 to prevent inappropriate utilization of glutamine for biosynthesis of nitrogen-containing metabolites. Npr2-deficient yeast metabolize glutamine into nitrogenous metabolites and maintain high S-adenosyl methionine (SAM) levels instead of accumulating glutamine as wild-type cells do under nutrient-limited conditions. Methionine supplementation stimulates glutamine consumption for nitrogenous metabolite synthesis in wild-type yeast, demonstrating integration of sulfur amino acid signals with nitrogen utilization via the Npr2 complex.\",\n      \"method\": \"Metabolomics (NMR/MS), genetic analysis of Npr2-deficient yeast, nutrient supplementation experiments\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — metabolomics + genetic analysis, single lab\",\n      \"pmids\": [\"25515537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NPRL2 mutations cause familial focal epilepsy in humans; NPRL2 mutations make mTOR signaling resistant to amino acid deprivation, and some patients have focal epilepsy associated with brain malformations. Together with NPRL3 and DEPDC5 mutations (all GATOR1 components), GATOR1 gene mutations are the most significant cause of familial focal epilepsy identified to date.\",\n      \"method\": \"Targeted capture and next-generation sequencing of 404 epilepsy patients, exome sequencing of two families, linkage analysis\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic association with mechanistic context from prior biochemical studies; human genetics\",\n      \"pmids\": [\"26505888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NPRL2 is required for mouse viability and fetal liver hematopoiesis. NPRL2 KO embryos have reduced methionine levels and defective cobalamin (vitamin B12) processing: NPRL2 KO liver and MEFs show impaired lysosomal acidification, defective processing of the cobalamin-transport protein transcobalamin 2, and impaired cobalamin-dependent methionine synthesis from homocysteine. Supplementation with cyanocobalamin rescues the methionine synthesis defect.\",\n      \"method\": \"Conditional knockout mice, metabolomics (methionine levels), lysosomal acidification assays, transcobalamin 2 processing assays, cyanocobalamin rescue\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse model + metabolomics + rescue experiment, multiple orthogonal methods\",\n      \"pmids\": [\"26166573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NPRL2 interacts with Raptor (mTORC1 subunit) in an amino acid-dependent manner to positively regulate mTORC1 activity. In amino acid sufficiency, NPRL2 binds Raptor to activate mTORC1; in amino acid scarcity, NPRL2 preferentially binds the dominant-negative RagA(GDP)/RagD(GTP) heterodimer to inhibit mTORC1. NPRL2 localizes predominantly to lysosomal membranes. A 'seesaw' model is proposed in which NPRL2 binding to Raptor vs. Rag GTPases determines mTORC1 activation state.\",\n      \"method\": \"Co-immunoprecipitation with Raptor and Rag GTPase mutants, lysosomal localization (immunofluorescence), Drosophila in vivo validation\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP study; seesaw model partially conflicts with dominant GATOR1 literature showing NPRL2 as purely inhibitory\",\n      \"pmids\": [\"26582740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Yeast Npr2 is a phosphoprotein and target of the SCF(Grr1) E3 ubiquitin ligase. Phosphorylated Npr2 accumulates in grr1Δ mutants; Npr2 is stabilized by proteasome inactivation. Phosphorylation-dependent instability depends on casein kinases Yck1 and Yck2. Npr2 is required for robust growth on ammonium or urea nitrogen sources and for efficient meiosis completion.\",\n      \"method\": \"Mass spectrometry identification, genetic analysis of grr1Δ/proteasome mutants, casein kinase deletion analysis, growth assays on defined nitrogen sources\",\n      \"journal\": \"Eukaryotic cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS identification + genetic epistasis + phosphorylation analysis, single lab\",\n      \"pmids\": [\"20154027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cryo-EM structures of GATOR1 and GATOR1-Rag GTPase complexes reveal that GATOR1 adopts an extended architecture with a central cavity; NPRL2 serves as a linker between DEPDC5 and NPRL3. The NPRL2-NPRL3 heterodimer contacts RagA to execute GAP activity (GTP hydrolysis stimulation), while DEPDC5 contacts the Rag heterodimer in an inhibitory mode. At least two binding modes exist between Rag GTPases and GATOR1.\",\n      \"method\": \"Cryo-electron microscopy, biochemical GAP activity assays, co-immunoprecipitation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure + biochemical GAP assay, landmark structural study\",\n      \"pmids\": [\"29590090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Arg-78 of NPRL2 is the arginine finger that catalyzes GATOR1's GAP function (stimulated GTP hydrolysis by RagA). Substitution of Arg-78 renders mTORC1 signaling insensitive to amino acid starvation. This residue is frequently mutated in cancers such as glioblastoma. The GAP mode of GATOR1-Rag interaction is distinct from the inhibitory mode previously captured structurally.\",\n      \"method\": \"Site-directed mutagenesis, in vitro GTP hydrolysis assays, co-immunoprecipitation, structural analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted GTP hydrolysis assay + mutagenesis of catalytic residue + structural validation\",\n      \"pmids\": [\"30651352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Overexpression of NPRL2 in cells with active p53 induces NOX2-dependent production of reactive oxygen species and DNA damage; overexpressed NPRL2 accumulates in the nucleus together with apoptosis-inducing factor (AIF). These events are accompanied by p53 phosphorylation, DNA damage response activation, and G1 arrest followed by apoptosis. In p53-negative cells, NPRL2 overexpression leads to CHK1 or CHK2 activation and G2/M arrest. These functions are distinct from NPRL2's role in mTORC1 regulation.\",\n      \"method\": \"Overexpression in multiple cell lines, ROS measurement, nuclear fractionation/localization, co-localization with AIF, flow cytometry for cell cycle, Western blotting for DNA damage markers\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ROS, localization, cell cycle), single lab\",\n      \"pmids\": [\"29127423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NPRL2 enhances autophagy in castration-resistant prostate cancer (CRPC) and promotes resistance to Everolimus (an mTOR inhibitor). NPRL2 silencing increases mTOR signaling activity, attenuates autophagy, and increases apoptosis in Everolimus-treated CRPC cells. In xenograft mouse models, NPRL2-silenced tumors show increased sensitivity to Everolimus associated with autophagy attenuation and apoptosis.\",\n      \"method\": \"siRNA knockdown, Western blotting for mTOR/autophagy markers, apoptosis assays, xenograft mouse model\",\n      \"journal\": \"The Prostate\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined phenotype in vitro and in vivo, single lab\",\n      \"pmids\": [\"30178500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TUSC4/NPRL2 functions as a tumor suppressor by physically interacting with the E3 ligase HERC2, which prevents BRCA1 degradation through the ubiquitination pathway. TUSC4/NPRL2 silencing enhances BRCA1 polyubiquitination and degradation, leading to marked reduction in homologous recombination repair efficiency. TUSC4 silencing was sufficient to transform normal mammary epithelial cells and enhance sensitivity to PARP inhibitors.\",\n      \"method\": \"Global expression analysis, Co-immunoprecipitation (TUSC4-HERC2 interaction), ubiquitination assay, HR repair efficiency assay, in vitro transformation, in vivo tumorigenesis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP + ubiquitination assay + functional HR readout, single lab\",\n      \"pmids\": [\"25480944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In fission yeast, Npr2-Npr3 (NPRL2-NPRL3 homologs) function together with Lam2 (LAMTOR2 homolog) as a tether for GDP-bound Gtr1 to the vacuolar membrane, thereby suppressing TORC1 activity. Loss of Lam2, Gtr1, Gtr2, Npr2, or Npr3 all disinhibit TORC1 under nitrogen depletion. Lam2 physically interacts with Npr2 and Gtr1.\",\n      \"method\": \"Genetic phenocopy analysis, TORC1 activity assay (Rps6 phosphorylation), co-immunoprecipitation (Lam2-Npr2-Gtr1), localization studies\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP + genetic epistasis + localization, single lab in fission yeast\",\n      \"pmids\": [\"27227887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Conditional deletion of Nprl2 from mouse dorsal telencephalon (Emx1-Cre) causes spontaneous seizures and dysmorphic enlarged neuronal cells with increased mTORC1 signaling, recapitulating features of human GATORopathy. Chronic rapamycin administration dramatically prolonged survival and inhibited seizures, but rapamycin benefit after withdrawal was less durable in Nprl2-cKO than Depdc5-cKO mice.\",\n      \"method\": \"Conditional knockout mice (Cre-lox), EEG seizure monitoring, histological analysis of neuronal morphology, mTORC1 signaling assays (phospho-S6), rapamycin treatment\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO mouse with multiple mechanistic readouts + pharmacological rescue\",\n      \"pmids\": [\"34965576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of NPRL2 expression in mouse excitatory glutamatergic neurons causes seizures and early lethality consistent with SUDEP. NPRL2 deficiency increases mTORC1-dependent signaling, alters brain amino acid homeostasis, reduces dendritic branching, and increases action potential strength. Loss of NPRL2 elevates expression of epilepsy-linked voltage-gated sodium channel Scn1A in neurons, and this upregulation is prevented by rapamycin treatment, placing Scn1A regulation downstream of NPRL2-mTORC1.\",\n      \"method\": \"Neuron-specific conditional knockout, electrophysiology (action potential recordings), sodium channel expression (Western blot/qPCR), rapamycin rescue, metabolomics (amino acid profiling)\",\n      \"journal\": \"eNeuro\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO + electrophysiology + pharmacological rescue with specific mechanistic readout (Scn1A), multiple orthogonal methods\",\n      \"pmids\": [\"35165201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NPRL2 down-regulation in HCC increases Rag GTPase and mTOR activation and inhibits autophagy in vitro and in vivo. NPRL2 knockdown reduces expression of NPRL3 and DEPDC5 (the other GATOR1 subunits), suggesting NPRL2 stabilizes the complex. NPRL2-silenced cells showed enhanced proliferation, migration, and colony formation.\",\n      \"method\": \"siRNA/shRNA knockdown, subcutaneous and orthotopic xenograft mouse models, Western blotting for mTOR/Rag/autophagy markers\",\n      \"journal\": \"Hepatology communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD + in vitro + in vivo with defined mechanistic readouts, single lab\",\n      \"pmids\": [\"36321403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of Nprl2 in Drosophila decreases lifespan, causes age-related digestive dysfunction (distended crop, food accumulation, decreased crop contraction, short gut length, high intestinal stem cell proliferation), and metabolic dysfunction. All age-related phenotypes are rescued by decreasing TORC1 activity, demonstrating that Nprl2-mediated TORC1 inhibition protects against digestive tract senescence.\",\n      \"method\": \"Nprl2 loss-of-function mutation in Drosophila, lifespan assays, intestinal morphology and function assays, TORC1 inhibition rescue (rapamycin/genetic)\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with phenotypic rescue by TORC1 inhibition in Drosophila\",\n      \"pmids\": [\"31712450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In a mouse model with neocortical loss of Nprl2, increased mTORC1 signaling produces spontaneous seizures with excitatory/inhibitory imbalance (increased EPSC, decreased IPSC frequencies). Proteomic and metabolomic analyses reveal increases in glycine levels, and glycine actions on NMDA receptors contribute to both electrophysiological and survival phenotypes. This identifies glycine-NMDA receptor signaling as a downstream consequence of NPRL2 loss and mTORC1 hyperactivation.\",\n      \"method\": \"Conditional Nprl2 KO mouse, electrophysiology (patch clamp), proteomics, metabolomics (glycine measurement), pharmacological manipulation of NMDA receptors\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO + electrophysiology + proteomics + metabolomics + pharmacological rescue, multiple orthogonal methods\",\n      \"pmids\": [\"35602938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"E2F1 binds to the NPRL2 promoter and activates its transcription in prostate cancer cells. FOXO1 interacts with E2F1 and weakens E2F1 binding to the NPRL2 promoter, thereby suppressing NPRL2 transcription and inhibiting prostate cancer cell proliferation. NPRL2 inhibition significantly reduces E2F1-enhanced cell proliferation.\",\n      \"method\": \"ChIP-seq data analysis (Cistrome), dual-luciferase assay, ChIP-qPCR, co-immunoprecipitation (FOXO1-E2F1), cell proliferation/colony formation assays\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-qPCR + dual-luciferase + Co-IP + functional rescue, single lab\",\n      \"pmids\": [\"34459063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NPRL2 interacts with UBE2M (a neddylation E2 enzyme), and this interaction increases NPRL2 protein stability by reducing its polyubiquitination and proteasomal degradation. NPRL2 cooperatively enhances UBE2M-mediated neddylation, facilitating degradation of substrates of Cullin-RING E3 ubiquitin ligases (CRLs). Depletion of NPRL2 or UBE2M significantly increases sensitivity of CRPC cells to the PARP inhibitor niraparib.\",\n      \"method\": \"Co-immunoprecipitation (NPRL2-UBE2M), immunofluorescence, ubiquitination assay, neddylation assay, in vitro and in vivo drug sensitivity assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP validated by bioinformatics + ubiquitination/neddylation assays, single lab\",\n      \"pmids\": [\"33905671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NPRL2 gene therapy in humanized mice bearing KRAS/STK11/anti-PD1-resistant NSCLC tumors reduces lung metastases significantly, correlating with increased infiltration of cytotoxic T cells and HLA-DR+ DCs, and decreased regulatory T cells and MDSCs. Stable NPRL2 expression downregulates MAPK and AKT-mTOR signaling and increases colony-formation inhibition and carboplatin sensitivity. CD8-T cell, macrophage, and CD4-T cell depletion abolishes the antitumor effect. IFNγ, CD8b, TBX21 are increased; FOXP3, TGFB1/B2, IL-10RA, and T-cell co-inhibitory molecules are downregulated.\",\n      \"method\": \"Humanized mouse model (CD34+ stem cell transplant), in vivo tumor growth assays, immune cell depletion experiments, flow cytometry of TME immune populations, protein expression profiling\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vivo experiments with immune depletion validation, single lab\",\n      \"pmids\": [\"39932765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NPRL2 promotes TRIM16 expression (via inactivation of ERK1/2), and TRIM16 mediates ubiquitination-dependent degradation of Galectin-3 (Gal-3), reducing Gal-3 secretion from glioma cells. Secreted Gal-3 triggers copper uptake and cuproptosis in CD8+ T cells; NPRL2 expression thus protects CD8+ T cells from Gal-3-mediated cuproptosis and increases their recruitment. Clinical samples show NPRL2 positively correlates with TRIM16 and negatively correlates with Gal-3 and CD8+ T cell accumulation.\",\n      \"method\": \"Overexpression/knockdown experiments, co-immunoprecipitation (NPRL2-TRIM16), ubiquitination assays, cuproptosis assays in CD8+ T cells, immunohistochemistry of clinical glioma specimens\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP + ubiquitination assay + functional immune readout, single lab\",\n      \"pmids\": [\"39367988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GATOR1 components including NPRL2 are mutated in focal epilepsies associated with focal cortical dysplasia; brain tissue from patients with NPRL2 mutations shows hyperactivation of the mTORC1 pathway as measured by phospho-S6 immunoreactivity.\",\n      \"method\": \"Targeted sequencing of GATOR1/GATOR2 genes, phospho-S6 immunohistochemistry in resected brain tissue\",\n      \"journal\": \"Epilepsia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — tissue-based mTORC1 readout in human brain, mechanistically consistent with GATOR1 function\",\n      \"pmids\": [\"27173016\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NPRL2 is a core subunit of the GATOR1 complex (with DEPDC5 and NPRL3) that acts as a GTPase-activating protein (GAP) for RagA/RagB GTPases, with Arg-78 of NPRL2 serving as the catalytic arginine finger; GATOR1 inhibits mTORC1 by promoting GTP hydrolysis on RagA in response to amino acid starvation, and loss of NPRL2 causes constitutive mTORC1 hyperactivation, leading to impaired autophagy, seizures (via sodium channel Scn1A upregulation and glycine-NMDA receptor dysregulation), disrupted hematopoiesis and lysosomal cobalamin processing, and tumor suppression defects including impaired DNA damage checkpoint signaling (via ATM-Chk1/Chk2), PDK1 inhibition, HERC2-BRCA1 stabilization, and UBE2M-mediated neddylation regulation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NPRL2 is a core subunit of the GATOR1 complex (with DEPDC5 and NPRL3) that functions as a GTPase-activating protein (GAP) for RagA/Gtr1 GTPases to inhibit mTORC1 signaling in response to amino acid insufficiency, thereby coupling nutrient status to cell growth, autophagy, and metabolism. NPRL2 provides the catalytic arginine finger (Arg-78) that stimulates GTP hydrolysis on RagA, and loss of this residue or of NPRL2 itself renders mTORC1 constitutively active, leading to embryonic lethality in mice, defective lysosomal cobalamin processing, and dysregulated amino acid metabolism [PMID:30651352, PMID:26166573, PMID:25046117]. Conditional neuronal deletion of Nprl2 causes spontaneous seizures, aberrant sodium channel expression, and glycine-mediated excitatory/inhibitory synaptic imbalance—phenotypes partially rescued by rapamycin—establishing NPRL2 as a causal epilepsy gene [PMID:35165201, PMID:34965576, PMID:35602938]. Independent of mTORC1, NPRL2 suppresses PDK1 tyrosine phosphorylation, stabilizes BRCA1 by sequestering the Herc2 E3 ligase, and induces NOX2-dependent DNA-damage signaling, collectively underpinning its tumor-suppressor activity [PMID:18616680, PMID:25480944, PMID:29127423].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"The earliest functional link between Npr2 and drug cytotoxicity established that yeast NPR2 resides in the same pathway as the SR-protein kinase SKY1, but the molecular target of Npr2 remained unknown.\",\n      \"evidence\": \"Yeast gene deletion with cisplatin/doxorubicin survival assays and epistasis analysis\",\n      \"pmids\": [\"12869630\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct molecular target identified\", \"Mechanism of cisplatin sensitization not resolved\", \"Not tested in mammalian system\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of NPRL2 as a candidate tumor suppressor showed it is inactivated by homozygous deletion in multiple cancer types and suppresses tumor growth in vivo, but its biochemical function was undefined.\",\n      \"evidence\": \"Tetracycline-controlled transgene expression in cancer cell lines and SCID mouse xenografts, deletion screening in cancer genomes\",\n      \"pmids\": [\"15374952\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No binding partners or enzymatic activity identified\", \"Tumor suppression mechanism unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery that NPRL2 directly binds and inhibits PDK1 provided the first mechanistic link to a defined signaling pathway, suggesting NPRL2 restrains PI3K-Akt signaling independently of its later-discovered GATOR1 role.\",\n      \"evidence\": \"E. coli two-hybrid, co-immunoprecipitation, in vitro PDK1 kinase assay with domain deletion mutants\",\n      \"pmids\": [\"18616680\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding; not independently replicated\", \"Relationship to GATOR1 function not addressed\", \"Structural basis of PDK1 inhibition unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The demonstration that yeast Npr2 and Npr3 form a conserved heterodimer that specifically transmits amino acid starvation signals to inactivate TORC1 established the core nutrient-sensing function of the complex.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation in yeast and human cells, TORC1 reporter assays with genetic deletions and rapamycin rescue\",\n      \"pmids\": [\"19521502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of TORC1 inactivation unknown (GAP vs. scaffolding)\", \"Full complex composition not yet identified (DEPDC5/Iml1 role unclear)\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Parallel advances revealed that Npr2 is itself regulated by casein kinase-mediated phosphorylation and SCF(Grr1)-dependent proteasomal degradation, and that NPRL2 re-expression activates ATM-dependent DNA-damage checkpoint signaling to re-sensitize cisplatin-resistant cancer cells.\",\n      \"evidence\": \"Mass spectrometry and yeast genetics for turnover; NPRL2 gene transfer with checkpoint protein Western blotting and orthotopic xenograft for DNA-damage signaling\",\n      \"pmids\": [\"20154027\", \"20700484\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ATM activation is direct or indirect unknown\", \"Whether Npr2 turnover regulation is conserved in mammals untested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of the trimeric Iml1-Npr2-Npr3 complex (SEACIT/GATOR1 ancestor) and its requirement for non-nitrogen-starvation autophagy defined the full subunit composition and connected the complex to autophagosome formation.\",\n      \"evidence\": \"Yeast genetic screen, live-cell fluorescence imaging, electron microscopy of autophagosomes\",\n      \"pmids\": [\"21900499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Iml1/DEPDC5 or Npr2 provides catalytic activity was unresolved\", \"Lysosomal targeting mechanism unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Convergent studies in budding yeast, Drosophila, and human cells established that Npr2-Npr3 promotes GTP hydrolysis on Gtr1/RagA to inactivate TORC1, defined the metabolic consequence as prevention of inappropriate glutamine utilization, and showed the complex stabilizes BRCA1 through Herc2 interaction.\",\n      \"evidence\": \"GTPase nucleotide-state mutant epistasis and Co-IP (yeast); Drosophila oogenesis genetics and lysosomal localization; metabolomics in yeast; BRCA1 ubiquitination assays and HR repair efficiency in human cells\",\n      \"pmids\": [\"25046117\", \"24786828\", \"25515537\", \"25480944\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic residue not yet identified\", \"Structural basis of GAP activity unknown\", \"Whether BRCA1 stabilization is GATOR1-dependent or independent unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mouse knockout demonstrated that NPRL2 is essential for embryonic viability, fetal liver hematopoiesis, lysosomal acidification, and cobalamin-dependent methionine synthesis, revealing systemic consequences of constitutive mTORC1 activation.\",\n      \"evidence\": \"Global Nprl2 knockout mice, lysosomal pH measurement, cobalamin processing assays, metabolomics, cyanocobalamin rescue\",\n      \"pmids\": [\"26166573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type-specific contributions not dissected\", \"Whether cobalamin defect is a direct or indirect consequence of mTORC1 hyperactivation unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of NOX2-dependent ROS production and AIF-mediated apoptosis downstream of NPRL2 overexpression, modulated by p53 status, provided a mechanism for its tumor-suppressive and DNA-damage-inducing activities independent of the canonical GATOR1-mTORC1 axis.\",\n      \"evidence\": \"NPRL2 overexpression in mammalian cells, NOX2 inhibitor rescue, AIF nuclear translocation, flow cytometry\",\n      \"pmids\": [\"29127423\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression system may not reflect physiological NPRL2 levels\", \"Direct molecular link between NPRL2 and NOX2 activation unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Pinpointing Arg-78 of NPRL2 as the catalytic arginine finger for RagA GAP activity resolved the long-standing question of which GATOR1 subunit provides the catalytic residue and showed that cancer-associated mutations at this site abolish GAP function.\",\n      \"evidence\": \"Site-directed mutagenesis, in vitro GTP hydrolysis assay, structural analysis\",\n      \"pmids\": [\"30651352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full cryo-EM structure of GATOR1 engaging RagA not yet available at this point\", \"Contribution of DEPDC5 to catalysis or substrate positioning unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Three independent conditional knockout studies in mouse brain established NPRL2 as a causal epilepsy gene, showing that neuronal mTORC1 hyperactivation drives seizures through elevated sodium channel expression, glycine-mediated synaptic imbalance, and altered dendritic morphology—phenotypes partially rescued by rapamycin.\",\n      \"evidence\": \"Conditional neuronal Nprl2 KO mice (multiple Cre lines), EEG, electrophysiology (EPSC/IPSC), rapamycin rescue, proteomics and metabolomics\",\n      \"pmids\": [\"35165201\", \"34965576\", \"35602938\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether seizure phenotypes arise from developmental or acute mTORC1 deregulation is unclear\", \"Patient genotype–phenotype correlation for human NPRL2 mutations not systematically addressed\", \"Whether non-mTORC1 functions of NPRL2 contribute to epilepsy untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the structural basis of GATOR1-RagA engagement in a full reconstituted complex, whether NPRL2's mTORC1-independent functions (PDK1 inhibition, BRCA1 stabilization, NOX2 activation) operate through the same or distinct NPRL2 pools, and the mechanisms by which GATOR1 is recruited to lysosomes and regulated by upstream amino acid sensors.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Full structural model of GATOR1-Rag engagement at atomic resolution\", \"Delineation of GATOR1-dependent vs. GATOR1-independent NPRL2 functions\", \"Upstream signals linking individual amino acid sensors to NPRL2/GATOR1 activation\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 3, 5, 14]},\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [4, 10]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 3, 5, 14, 15]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [12, 18]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [5, 9, 16]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [14, 15, 16]}\n    ],\n    \"complexes\": [\n      \"GATOR1 (NPRL2-NPRL3-DEPDC5)\"\n    ],\n    \"partners\": [\n      \"NPRL3\",\n      \"DEPDC5\",\n      \"PDK1\",\n      \"HERC2\",\n      \"UBE2M\",\n      \"RPTOR\",\n      \"RRAGD\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"NPRL2 is a core subunit of the GATOR1 complex (with DEPDC5 and NPRL3) that functions as a GTPase-activating protein (GAP) for RagA/RagB GTPases to negatively regulate mTORC1 signaling in response to amino acid availability, thereby controlling autophagy, cell growth, and metabolic homeostasis. Cryo-EM structures show NPRL2 bridges DEPDC5 and NPRL3 within GATOR1, and Arg-78 of NPRL2 serves as the catalytic arginine finger essential for stimulating GTP hydrolysis on RagA [PMID:29590090, PMID:30651352]. Loss of NPRL2 causes constitutive mTORC1 hyperactivation, leading to impaired autophagy, defective lysosomal cobalamin processing, disrupted hematopoiesis, and spontaneous seizures with excitatory/inhibitory imbalance attributable in part to mTORC1-dependent upregulation of Scn1A and glycine-NMDA receptor dysregulation [PMID:26166573, PMID:35165201, PMID:35602938]. Germline NPRL2 mutations cause familial focal epilepsy with focal cortical dysplasia in humans, and somatic inactivation across multiple cancer types identifies NPRL2 as a tumor suppressor that promotes DNA damage checkpoint signaling and cisplatin sensitivity [PMID:26505888, PMID:20700484, PMID:23723238].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of NPRL2 as a candidate tumor suppressor in a recurrently deleted 3p21.3 region established the gene's potential relevance to lung cancer biology and provided initial structural annotation including homology to yeast NPR2.\",\n      \"evidence\": \"Homozygous deletion mapping and sequence analysis in lung cancer cell lines\",\n      \"pmids\": [\"11085536\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional data demonstrating tumor suppressor activity\", \"Homology to yeast NPR2 not yet mechanistically exploited\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Ectopic expression of NPRL2 inhibited lung cancer cell growth and suppressed xenograft tumors, providing the first functional evidence for tumor suppressor activity.\",\n      \"evidence\": \"Adenovirus-mediated gene transfer in NPRL2-deficient lung cancer cells, xenograft and metastasis models in nude mice\",\n      \"pmids\": [\"11980673\", \"15374952\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of growth suppression unknown\", \"No molecular target or pathway identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that yeast Npr2-Npr3 form a conserved complex required for TORC1 inactivation upon amino acid starvation linked NPRL2 to the TOR signaling pathway for the first time.\",\n      \"evidence\": \"Genome-wide reverse genetic screen, co-immunoprecipitation of yeast and human NPRL2-NPRL3 heterodimer\",\n      \"pmids\": [\"19521502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of TORC1 inhibition (direct vs. indirect) unknown\", \"Mammalian pathway components not yet defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"NPRL2 was shown to activate the ATM-Chk1/Chk2 DNA damage checkpoint pathway and sensitize cancer cells to cisplatin, revealing a role in DNA damage signaling distinct from nutrient sensing.\",\n      \"evidence\": \"Western blotting for checkpoint kinases, kinase activity assays, cell cycle analysis, in vivo xenograft\",\n      \"pmids\": [\"20700484\", \"17018626\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether DNA damage signaling is mTORC1-dependent or independent not resolved\", \"Direct molecular mechanism linking NPRL2 to ATM activation unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The landmark identification of GATOR1 (DEPDC5-NPRL2-NPRL3) as a GAP for RagA/RagB unified NPRL2's tumor suppressor and nutrient-sensing roles by placing it as a direct negative regulator of mTORC1's amino acid sensing arm.\",\n      \"evidence\": \"Affinity purification/mass spectrometry, in vitro GAP activity assay, siRNA epistasis with GATOR2, cancer mutation analysis\",\n      \"pmids\": [\"23723238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic mechanism and which residue provides GAP activity unknown\", \"Structural basis of GATOR1-Rag interaction unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Multiple studies established that the NPRL2-NPRL3 heterodimer acts upstream of Rag GTPases in both yeast and Drosophila to regulate autophagy and TORC1, and revealed additional roles in nitrogen metabolism and BRCA1 stability via HERC2 interaction.\",\n      \"evidence\": \"Yeast genetic epistasis with Gtr1/Gtr2, Drosophila lysosomal localization and oogenesis phenotypes, Co-IP of NPRL2-HERC2 and HR repair assays\",\n      \"pmids\": [\"25046117\", \"24786828\", \"25480944\", \"25515537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"HERC2-BRCA1 mechanism not confirmed as mTORC1-dependent or independent\", \"Autophagy role in mammalian NPRL2 loss not yet characterized in vivo\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"NPRL2 knockout mice revealed essential roles in embryonic viability, fetal liver hematopoiesis, and lysosomal cobalamin processing, demonstrating that GATOR1-mTORC1 regulation has metabolic consequences beyond canonical mTOR signaling, and human genetic studies established NPRL2 mutations as a cause of familial focal epilepsy.\",\n      \"evidence\": \"Conditional KO mice with metabolomics and cyanocobalamin rescue; targeted sequencing of 404 epilepsy patients with linkage analysis\",\n      \"pmids\": [\"26166573\", \"26505888\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How mTORC1 hyperactivation disrupts lysosomal acidification mechanistically unclear\", \"Genotype-phenotype correlations for different NPRL2 epilepsy mutations not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Cryo-EM structures of GATOR1 revealed that NPRL2 serves as the architectural linker between DEPDC5 and NPRL3, and the NPRL2-NPRL3 heterodimer directly contacts RagA for GAP activity, resolving the structural basis of GATOR1 function.\",\n      \"evidence\": \"Cryo-EM at sub-4Å resolution with biochemical GAP assays\",\n      \"pmids\": [\"29590090\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic residue not yet identified\", \"Transition between inhibitory and GAP binding modes not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of Arg-78 as the catalytic arginine finger of NPRL2 defined the atomic mechanism of GATOR1's GAP activity and explained why this residue is recurrently mutated in cancer.\",\n      \"evidence\": \"Site-directed mutagenesis of Arg-78, in vitro GTP hydrolysis assays, mTORC1 signaling readouts\",\n      \"pmids\": [\"30651352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full catalytic cycle and conformational changes during GAP reaction not structurally captured\", \"Cancer-associated mutations beyond Arg-78 not functionally characterized\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Neuron-specific Nprl2 knockout mouse models revealed that mTORC1 hyperactivation causes seizures through specific downstream effectors including upregulation of the voltage-gated sodium channel Scn1A and glycine-NMDA receptor dysregulation, identifying tractable therapeutic targets.\",\n      \"evidence\": \"Conditional KO in glutamatergic neurons and dorsal telencephalon, electrophysiology, rapamycin rescue of Scn1A upregulation, metabolomics identifying glycine accumulation, NMDA receptor pharmacology\",\n      \"pmids\": [\"35165201\", \"35602938\", \"34965576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Scn1A and glycine pathways are independent or converging downstream of mTORC1 is unclear\", \"Cell-type-specific consequences of NPRL2 loss in inhibitory neurons not addressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"NPRL2 was linked to regulation of the tumor immune microenvironment through TRIM16-mediated Galectin-3 degradation preventing CD8+ T cell cuproptosis, and gene therapy in humanized mice showed NPRL2 restores anti-tumor immunity in KRAS/STK11-mutant NSCLC.\",\n      \"evidence\": \"Co-IP and ubiquitination assays for NPRL2-TRIM16-Gal-3 axis; humanized mouse models with immune cell depletion experiments\",\n      \"pmids\": [\"39367988\", \"39932765\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"TRIM16-Gal-3 axis not confirmed as mTORC1-dependent\", \"Whether immune-modulatory effects are separable from cell-autonomous tumor suppression not resolved\", \"Single-lab findings awaiting independent replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the structural basis of the GATOR1 GAP catalytic cycle at atomic resolution, the mechanistic relationship between NPRL2's mTORC1-dependent and apparently mTORC1-independent functions (DNA damage, HERC2-BRCA1, UBE2M-neddylation), and whether therapeutic mTORC1 inhibition can substitute for NPRL2 loss across all disease contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full catalytic cycle structure of GATOR1 engaged with RagA-GTP\", \"mTORC1-independent functions lack reconstitution with purified components\", \"Genotype-phenotype relationships for clinical NPRL2 variants remain limited\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [9, 17, 18]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [11, 15]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [9, 10, 17, 18]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [8, 10, 11, 20]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 3, 13, 23, 32]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 9, 12, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 5, 19]}\n    ],\n    \"complexes\": [\n      \"GATOR1\"\n    ],\n    \"partners\": [\n      \"DEPDC5\",\n      \"NPRL3\",\n      \"RRAGA\",\n      \"RPTOR\",\n      \"HERC2\",\n      \"UBE2M\",\n      \"PDK1\",\n      \"TRIM16\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}