{"gene":"NPRL2","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2019,"finding":"Arg-78 of NPRL2 functions as the catalytic arginine finger that executes GATOR1's GAP activity toward RagA, stimulating GTP hydrolysis. Substitution of Arg-78 renders mTORC1 signaling insensitive to amino acid starvation. This was established by site-directed mutagenesis, in vitro GTP hydrolysis assays, co-immunoprecipitation, and structural analysis.","method":"Site-directed mutagenesis, in vitro GTP hydrolysis assay, co-immunoprecipitation, structural analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of GTPase activity with mutagenesis, structural analysis, and functional validation in cells; multiple orthogonal methods in single rigorous study","pmids":["30651352"],"is_preprint":false},{"year":2014,"finding":"In Drosophila, Nprl2 and Nprl3 physically interact and co-localize to lysosomes and autolysosomes. Nprl2/3 inhibit TORC1 signaling in the female germline in response to amino acid starvation, and this inhibition is required to prevent apoptosis during nutrient scarcity. Nprl2/3 also work in concert with Tsc1/2 to fine-tune TORC1 activity.","method":"Co-immunoprecipitation, immunofluorescence localization, genetic loss-of-function, epistasis analysis with Tsc1/2","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal physical interaction, direct lysosomal localization, genetic epistasis, and defined phenotypic readout; multiple orthogonal methods","pmids":["24786828"],"is_preprint":false},{"year":2015,"finding":"NPRL2 is required for mouse viability and fetal liver hematopoiesis. NPRL2 KO impairs lysosomal acidification and lysosomal gene expression, defective cobalamin-dependent methionine synthesis from homocysteine, and defective processing of the cobalamin-transport protein transcobalamin 2. These defects are rescued by cyanocobalamin supplementation, placing NPRL2 upstream of lysosomal-dependent cobalamin processing and methionine synthesis.","method":"Conditional knockout mouse model, metabolomics, cell fractionation, rescue experiments with cyanocobalamin","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple KO models with defined biochemical phenotypes, rescue experiments, and multiple orthogonal methods","pmids":["26166573"],"is_preprint":false},{"year":2008,"finding":"NPRL2/TUSC4 forms a complex with PDK1 via its N-terminal 133 amino acid residues and suppresses Src-dependent tyrosine phosphorylation and activation of PDK1 in vitro and in cells. Deletion of the N-terminal domain abolishes this inhibitory effect, indicating complex formation is required for PDK1 inactivation.","method":"E. coli two-hybrid screening, co-immunoprecipitation, in vitro kinase assay, deletion mutagenesis, siRNA knockdown","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical interaction mapped by deletion mutagenesis with in vitro kinase assay, but single lab","pmids":["18616680"],"is_preprint":false},{"year":2014,"finding":"NPRL2/TUSC4 physically interacts with the E3 ubiquitin ligase HERC2, preventing BRCA1 degradation through the ubiquitination pathway. TUSC4 silencing enhances BRCA1 polyubiquitination and degradation, reducing homologous recombination repair efficiency.","method":"Co-immunoprecipitation, ubiquitination assay, gene expression profiling, HR repair assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, functional ubiquitination assay, HR repair readout; single lab with multiple orthogonal methods","pmids":["25480944"],"is_preprint":false},{"year":2015,"finding":"NPRL2 interacts with Raptor in amino acid sufficiency to activate mTORC1, while it interacts with RagD (particularly RagA(GDP)/RagD(GTP) heterodimer) in amino acid scarcity to inhibit mTORC1. A reciprocal relationship exists between NPRL2 binding to Rag GTPases and Raptor, supporting a 'seesaw' model of mTORC1 regulation.","method":"Co-immunoprecipitation, dominant positive/negative Rag GTPase mutants, lysosomal localization by immunofluorescence, Drosophila genetic model","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with mutant validation and in vivo Drosophila confirmation, single lab","pmids":["26582740"],"is_preprint":false},{"year":2017,"finding":"Ectopic overexpression of NPRL2 in cells with active p53 induces NOX2-dependent reactive oxygen species production and DNA damage. Overexpressed NPRL2 accumulates in the nucleus together with apoptosis-inducing factor (AIF), triggering p53 phosphorylation, DNA damage response, and G1 arrest followed by apoptosis. In p53-negative cells, NPRL2 overexpression activates CHK1 or CHK2 and induces S or G2/M arrest.","method":"Overexpression, immunofluorescence, ROS assay, cell cycle analysis, co-localization with AIF","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple orthogonal methods (ROS assay, nuclear localization, checkpoint activation) in single lab; overexpression system","pmids":["29127423"],"is_preprint":false},{"year":2010,"finding":"Yeast Npr2 (ortholog of human NPRL2) is a phosphorylation-dependent substrate of the SCF(Grr1) E3 ubiquitin ligase. Phosphorylation by casein kinases Yck1 and Yck2 destabilizes Npr2; it accumulates in grr1Δ mutants and is stabilized when the proteasome is inhibited. Npr2 is required for robust growth on ammonium or urea as nitrogen sources and for meiosis completion.","method":"Mass spectrometry interaction, genetic analysis of grr1Δ mutants, proteasome inhibition, overexpression lethality assay","journal":"Eukaryotic cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-identified interaction with genetic and biochemical validation; ortholog in yeast with multiple supporting experiments","pmids":["20154027"],"is_preprint":false},{"year":2010,"finding":"Restoration of NPRL2 in cisplatin-resistant NSCLC cells activates ATM kinase in response to cisplatin, promotes downstream γ-H2AX formation, increases CHK1 and CHK2 kinase activity, and elevates cell cycle checkpoint proteins CDC25A and CDC25C, leading to G2/M arrest and apoptosis.","method":"NPRL2 gene transfection/re-expression, Western blot for ATM/γ-H2AX/CHK1/CHK2/CDC25, flow cytometry for cell cycle, in vivo xenograft","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — defined mechanistic pathway (ATM-CHK1/2-CDC25 axis) validated in vitro and in vivo, single lab with multiple markers","pmids":["20700484"],"is_preprint":false},{"year":2022,"finding":"Loss of NPRL2 in mouse excitatory glutamatergic neurons increases mTORC1-dependent signaling, reduces dendritic branching, and increases voltage-gated sodium channel expression (specifically Scn1A). Treatment with rapamycin prevents Scn1A upregulation, placing NPRL2-mTORC1 axis upstream of sodium channel regulation.","method":"Conditional neuronal knockout, electrophysiology (action potential recording), immunofluorescence, rapamycin rescue, primary neuron culture","journal":"eNeuro","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with pharmacological rescue establishing mechanistic pathway; single lab","pmids":["35165201"],"is_preprint":false},{"year":2022,"finding":"Neocortical loss of Nprl2 in mice increases mTORC1 signaling, causes spontaneous seizures, abnormal synaptic function (increased excitatory, decreased inhibitory currents), and elevates glycine levels. Glycine actions on NMDA receptors contribute to the electrophysiological and survival phenotypes, linking NPRL2 loss to altered amino acid/neurotransmitter metabolism.","method":"Conditional KO mouse, electrophysiology (EPSC/IPSC), proteomics, metabolomics, pharmacological NMDA receptor manipulation","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (electrophysiology, metabolomics, pharmacological rescue) in single lab","pmids":["35602938"],"is_preprint":false},{"year":2022,"finding":"Conditional deletion of Nprl2 from mouse dorsal telencephalon (Emx1cre) causes spontaneous seizures and dysmorphic enlarged neuronal cells with increased mTORC1 signaling. Chronic rapamycin administration inhibits seizure occurrence and extends survival but does not rescue enlarged neuronal cells.","method":"Conditional knockout mouse model, EEG seizure recording, histology, rapamycin treatment","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with pharmacological intervention establishing mTORC1 dependence; single lab","pmids":["34965576"],"is_preprint":false},{"year":2024,"finding":"HSP70 mediates CHIP-induced polyubiquitination and proteasomal degradation of NPRL2. CHIP (the chaperone-associated E3 ubiquitin ligase) interacts with NPRL2 to promote its degradation; HSP70 overexpression enhances whereas HSP70 depletion inhibits amino acid-induced mTORC1 activation. HSP70 knockdown promotes basal autophagic flux and inhibits cell growth.","method":"Co-immunoprecipitation, ubiquitination assay, HSP70 overexpression/knockdown, mTORC1 activity assay, autophagy flux assay","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, and functional mTORC1 readout; single lab with multiple orthogonal methods","pmids":["39495541"],"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 and facilitates degradation of substrates of Cullin-RING E3 ubiquitin ligases.","method":"Co-immunoprecipitation, immunofluorescence, ubiquitination assay, CCK-8, in vivo xenograft","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP validated interaction with mechanistic follow-up on ubiquitination and neddylation; single lab","pmids":["33905671"],"is_preprint":false},{"year":2024,"finding":"NPRL2 upregulates TRIM16 expression via inactivation of ERK1/2 signaling. TRIM16 in turn promotes ubiquitination-mediated degradation of Galectin-3 (Gal-3), reducing Gal-3 release from glioma cells. Secreted Gal-3 accelerates copper uptake and triggers cuproptosis in CD8+ T cells, so NPRL2 expression protects CD8+ T cells from cuproptosis in glioma.","method":"Co-immunoprecipitation, ubiquitination assay, flow cytometry for cuproptosis, Western blot for ERK signaling, clinical specimen correlation","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP for TRIM16-Gal3 interaction, functional cuproptosis assay; single lab","pmids":["39367988"],"is_preprint":false},{"year":2025,"finding":"Following radiation, NPRL2 translocates from the GATOR1 complex to the nucleus via AMPK-mediated phosphorylation of WDR24. In the nucleus, NPRL2 directly binds to the catalytic domains of E3 ubiquitin ligases HERC2 and RNF8, inactivating them and preventing degradation of DNA repair proteins, thereby promoting radioresistance.","method":"Nuclear fractionation, co-immunoprecipitation, AMPK inhibition, in vitro and in vivo radiosensitivity assays, domain binding assays","journal":"Acta pharmaceutica Sinica. B","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding to E3 ligase catalytic domains with nuclear localization experiment and pharmacological rescue; single lab","pmids":["41584340"],"is_preprint":false},{"year":2026,"finding":"NPRL2 interacts with PRRSV Nsp1α via its C-terminal domain and mediates K63-linked ubiquitination of Nsp1α at lysine 150, targeting it for autophagic degradation. NPRL2 overexpression inhibits PRRSV replication; knockdown enhances viral propagation.","method":"Co-immunoprecipitation, ubiquitination assay (K63-linkage specific), autophagic flux assay (LC3-II), viral replication assay, domain mapping","journal":"Veterinary research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-mapped interaction with mechanistic ubiquitination and autophagic degradation assays; single lab","pmids":["41742785"],"is_preprint":false},{"year":2004,"finding":"NPRL2 protein contains a bipartite nuclear localization signal, a protein-binding domain, similarity to the MutS core domain, and a nitrogen permease regulator 2 domain. The yeast ortholog NPR2 shares 32-36% identity. Re-expression of NPRL2 suppresses tumor growth in SCID mice and inhibits tumor cell growth in vitro.","method":"Sequence analysis, tet-controlled transgene expression, SCID mouse tumor suppression assay","journal":"Cancer research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — domain characterization by sequence analysis with tumor suppression assay; mechanistic detail is limited","pmids":["15374952"],"is_preprint":false}],"current_model":"NPRL2 is an essential catalytic subunit of the GATOR1 complex that inhibits mTORC1 by acting as the arginine-finger GAP (via Arg-78) to stimulate GTP hydrolysis by RagA; it localizes to lysosomes/autolysosomes where it senses amino acid sufficiency, and its stability is regulated by HSP70/CHIP-mediated ubiquitination and proteasomal degradation as well as SCF(Grr1)-dependent phosphodegron pathways in yeast. Beyond mTORC1, NPRL2 modulates PDK1 activity by direct binding, regulates BRCA1 stability via interaction with the E3 ligase HERC2, controls lysosomal cobalamin processing and methionine homeostasis, and upon radiation translocates to the nucleus to inhibit E3 ligases HERC2 and RNF8 through an AMPK/WDR24 axis, collectively positioning NPRL2 as a multi-functional regulator of nutrient sensing, DNA damage response, and lysosomal metabolism."},"narrative":{"mechanistic_narrative":"NPRL2 is the catalytic subunit of the lysosomal GATOR1 complex, where it functions as the GTPase-activating protein that couples amino acid availability to mTORC1 signaling [PMID:30651352, PMID:24786828]. It provides the catalytic arginine finger (Arg-78) that stimulates GTP hydrolysis by RagA, and mutation of this residue renders mTORC1 insensitive to amino acid starvation [PMID:30651352]; in concert with its partner Nprl3 it localizes to lysosomes and autolysosomes and restrains TORC1 during nutrient scarcity, cooperating with the Tsc1/2 axis [PMID:24786828]. NPRL2 toggles between Raptor binding in amino acid sufficiency and Rag GTPase binding in scarcity, implementing a reciprocal 'seesaw' control of mTORC1 [PMID:26582740]. In vivo, loss of NPRL2 elevates mTORC1 signaling and produces neuronal hypertrophy, altered excitatory/inhibitory balance, sodium channel (Scn1A) upregulation, and spontaneous seizures, phenotypes rescued by rapamycin [PMID:35165201, PMID:35602938, PMID:34965576]. Beyond nutrient sensing, NPRL2 is required for lysosomal acidification and cobalamin-dependent methionine synthesis [PMID:26166573]. Its own abundance is set by ubiquitin-proteasome control: HSP70 directs CHIP-mediated polyubiquitination and degradation of NPRL2, while UBE2M binding stabilizes it [PMID:39495541, PMID:33905671]. NPRL2 additionally engages the DNA damage response, restoring checkpoint signaling through the ATM–CHK1/2–CDC25 axis [PMID:20700484] and, upon radiation, translocating to the nucleus via AMPK-mediated WDR24 phosphorylation to directly inhibit the E3 ligases HERC2 and RNF8 and protect DNA repair proteins [PMID:41584340]. Functional links to PDK1 inhibition [PMID:18616680] and HERC2-dependent BRCA1 stabilization [PMID:25480944] further extend its regulatory reach.","teleology":[{"year":2004,"claim":"Established NPRL2 as a candidate tumor suppressor and defined its domain architecture, framing it as a multidomain nuclear/protein-binding protein before any mechanism was known.","evidence":"Sequence analysis and tet-controlled re-expression with SCID mouse tumor suppression assay","pmids":["15374952"],"confidence":"Low","gaps":["Domain assignments are computational, not structurally validated","No molecular mechanism for tumor suppression defined","MutS-core similarity has no demonstrated biochemical function"]},{"year":2008,"claim":"Provided an early biochemical activity by showing NPRL2 binds PDK1 and suppresses its Src-dependent activation, the first defined protein-protein mechanism.","evidence":"Two-hybrid screen, co-IP, in vitro kinase assay, and deletion mutagenesis in cells","pmids":["18616680"],"confidence":"Medium","gaps":["Single lab without reciprocal in vivo validation","Relationship to GATOR1/mTORC1 role unclear","Physiological context of PDK1 inhibition not defined"]},{"year":2010,"claim":"Connected NPRL2 to the DNA damage response and revealed conserved proteasomal control of the protein via the yeast ortholog.","evidence":"NPRL2 re-expression in cisplatin-resistant NSCLC with checkpoint marker analysis and xenografts; yeast Npr2 SCF(Grr1) phosphodegron genetics and proteasome inhibition","pmids":["20700484","20154027"],"confidence":"Medium","gaps":["Whether ATM-CHK1/2 activation is direct or downstream of altered signaling is unresolved","Casein-kinase phosphodegron not mapped onto human NPRL2","Connection between checkpoint role and nutrient sensing not established"]},{"year":2014,"claim":"Defined NPRL2 as a lysosome-localized TORC1 inhibitor acting with Nprl3 and Tsc1/2, and separately as an HERC2-binding stabilizer of BRCA1, establishing both its nutrient-sensing and genome-maintenance arms.","evidence":"Drosophila co-IP, immunofluorescence, genetic epistasis with Tsc1/2; human co-IP, ubiquitination and HR repair assays","pmids":["24786828","25480944"],"confidence":"High","gaps":["Mechanism by which NPRL2 prevents HERC2-mediated BRCA1 ubiquitination not biochemically reconstituted","Quantitative contribution of Nprl2/3 versus Tsc1/2 to TORC1 control unclear"]},{"year":2015,"claim":"Built the molecular logic of mTORC1 control by showing NPRL2 binds Raptor in nutrient sufficiency and Rag GTPases in scarcity, and demonstrated NPRL2 is required for lysosomal cobalamin/methionine metabolism in vivo.","evidence":"Co-IP with Rag mutants and Drosophila genetics; conditional KO mouse, metabolomics, and cyanocobalamin rescue","pmids":["26582740","26166573"],"confidence":"Medium","gaps":["Structural basis of the Raptor/Rag binding switch not resolved","Mechanism linking NPRL2 to lysosomal acidification and transcobalamin 2 processing undefined","Whether cobalamin defect is GATOR1-dependent unclear"]},{"year":2017,"claim":"Showed that supraphysiological NPRL2 drives ROS-dependent DNA damage and checkpoint-mediated arrest, with outcomes branching on p53 status.","evidence":"Overexpression with ROS assay, nuclear co-localization with AIF, and cell cycle analysis","pmids":["29127423"],"confidence":"Medium","gaps":["Overexpression system may not reflect endogenous function","How NOX2/ROS induction connects to GATOR1 role unknown","Nuclear AIF co-localization mechanism not defined"]},{"year":2019,"claim":"Pinpointed Arg-78 as the catalytic arginine finger driving GATOR1 GAP activity toward RagA, defining the precise enzymatic basis of NPRL2-dependent mTORC1 inhibition.","evidence":"Site-directed mutagenesis, in vitro GTP hydrolysis assay, co-IP, and structural analysis","pmids":["30651352"],"confidence":"High","gaps":["Regulation of GAP activity by upstream signals not addressed","Does not connect catalytic mechanism to non-mTORC1 functions"]},{"year":2022,"claim":"Established the in vivo consequences of NPRL2 loss in neurons as mTORC1-driven, linking it to seizures, neuronal hypertrophy, synaptic imbalance, and neurotransmitter metabolism.","evidence":"Conditional neuronal/neocortical KO mice with electrophysiology, metabolomics, EEG, and rapamycin rescue","pmids":["35165201","35602938","34965576"],"confidence":"Medium","gaps":["Rapamycin does not rescue cell enlargement, indicating mTORC1-independent effects","Mechanism linking NPRL2 loss to glycine elevation and Scn1A upregulation incomplete","Single-lineage conditional models limit generalization"]},{"year":2024,"claim":"Defined opposing ubiquitin-system inputs that set NPRL2 abundance—HSP70/CHIP-driven degradation versus UBE2M-mediated stabilization—and extended NPRL2 into tumor immune regulation.","evidence":"Co-IP, ubiquitination assays, HSP70 and UBE2M manipulation, mTORC1 and autophagy flux readouts; TRIM16/Gal-3 cuproptosis assays in glioma","pmids":["39495541","33905671","39367988"],"confidence":"Medium","gaps":["Degradation and stabilization pathways not reconciled into a single regulatory model","ERK1/2–TRIM16–Gal-3 axis is correlative regarding direct NPRL2 enzymatic involvement","Single-lab findings without independent replication"]},{"year":2025,"claim":"Revealed a signal-induced relocalization mechanism whereby radiation triggers AMPK/WDR24-dependent nuclear translocation of NPRL2 to directly inhibit HERC2 and RNF8 and confer radioresistance.","evidence":"Nuclear fractionation, domain-binding assays to E3 ligase catalytic domains, AMPK inhibition, and radiosensitivity assays in vitro and in vivo","pmids":["41584340"],"confidence":"Medium","gaps":["How NPRL2 dissociates from GATOR1 mechanistically not fully defined","Stoichiometry of nuclear versus lysosomal pools unknown","Single-lab study"]},{"year":2026,"claim":"Extended NPRL2 to antiviral defense by showing it mediates K63-linked ubiquitination of PRRSV Nsp1α to drive its autophagic degradation.","evidence":"Co-IP, K63-linkage-specific ubiquitination assay, LC3-II autophagy flux, viral replication assay, and domain mapping","pmids":["41742785"],"confidence":"Medium","gaps":["Whether NPRL2 acts as an E3 ligase or adaptor in this ubiquitination is undefined","Relationship to GATOR1/autophagy regulation unclear","Single-lab, single-virus context"]},{"year":null,"claim":"How NPRL2's distinct activities—GATOR1 GAP catalysis, nuclear E3-ligase inhibition, ubiquitin-system control, and lysosomal cobalamin metabolism—are integrated and switched within one cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model reconciling lysosomal GAP function with nuclear and metabolic roles","Upstream regulation determining which function dominates is unknown","Structural basis for context-dependent partner switching not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,5]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3,15]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[1,5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,15]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[12,16]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[8,15]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,10]}],"complexes":["GATOR1"],"partners":["NPRL3","RAGA","RAGD","RPTOR","HERC2","RNF8","PDK1","UBE2M"],"other_free_text":[]}},"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":"26505888","id":"PMC_26505888","title":"Mutations in the mammalian target of rapamycin pathway regulators NPRL2 and NPRL3 cause focal epilepsy.","date":"2015","source":"Annals of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/26505888","citation_count":180,"is_preprint":false},{"pmid":"15374952","id":"PMC_15374952","title":"Functional characterization of the candidate tumor suppressor gene NPRL2/G21 located in 3p21.3C.","date":"2004","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/15374952","citation_count":62,"is_preprint":false},{"pmid":"17018626","id":"PMC_17018626","title":"The 3p21.3 tumor suppressor NPRL2 plays an important role in cisplatin-induced resistance in human non-small-cell lung cancer cells.","date":"2006","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/17018626","citation_count":60,"is_preprint":false},{"pmid":"30651352","id":"PMC_30651352","title":"Arg-78 of Nprl2 catalyzes GATOR1-stimulated GTP hydrolysis by the Rag GTPases.","date":"2019","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30651352","citation_count":55,"is_preprint":false},{"pmid":"24786828","id":"PMC_24786828","title":"The TORC1 inhibitors Nprl2 and Nprl3 mediate an adaptive response to amino-acid starvation in Drosophila.","date":"2014","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/24786828","citation_count":45,"is_preprint":false},{"pmid":"20193080","id":"PMC_20193080","title":"Simultaneous down-regulation of tumor suppressor genes RBSP3/CTDSPL, NPRL2/G21 and RASSF1A in primary non-small cell lung cancer.","date":"2010","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/20193080","citation_count":44,"is_preprint":false},{"pmid":"30178500","id":"PMC_30178500","title":"NPRL2 enhances autophagy and the resistance to Everolimus in castration-resistant prostate cancer.","date":"2018","source":"The Prostate","url":"https://pubmed.ncbi.nlm.nih.gov/30178500","citation_count":42,"is_preprint":false},{"pmid":"26166573","id":"PMC_26166573","title":"Regulation of Hematopoiesis and Methionine Homeostasis by mTORC1 Inhibitor NPRL2.","date":"2015","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/26166573","citation_count":40,"is_preprint":false},{"pmid":"20700484","id":"PMC_20700484","title":"NPRL2 sensitizes human non-small cell lung cancer (NSCLC) cells to cisplatin treatment by regulating key components in the DNA repair pathway.","date":"2010","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/20700484","citation_count":33,"is_preprint":false},{"pmid":"25480944","id":"PMC_25480944","title":"TUSC4 functions as a tumor suppressor by regulating BRCA1 stability.","date":"2014","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/25480944","citation_count":28,"is_preprint":false},{"pmid":"18616680","id":"PMC_18616680","title":"TUSC4/NPRL2, a novel 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Substitution of Arg-78 renders mTORC1 signaling insensitive to amino acid starvation. This was established by site-directed mutagenesis, in vitro GTP hydrolysis assays, co-immunoprecipitation, and structural analysis.\",\n      \"method\": \"Site-directed mutagenesis, in vitro GTP hydrolysis assay, co-immunoprecipitation, structural analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of GTPase activity with mutagenesis, structural analysis, and functional validation in cells; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"30651352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In Drosophila, Nprl2 and Nprl3 physically interact and co-localize to lysosomes and autolysosomes. Nprl2/3 inhibit TORC1 signaling in the female germline in response to amino acid starvation, and this inhibition is required to prevent apoptosis during nutrient scarcity. Nprl2/3 also work in concert with Tsc1/2 to fine-tune TORC1 activity.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence localization, genetic loss-of-function, epistasis analysis with Tsc1/2\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal physical interaction, direct lysosomal localization, genetic epistasis, and defined phenotypic readout; multiple orthogonal methods\",\n      \"pmids\": [\"24786828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NPRL2 is required for mouse viability and fetal liver hematopoiesis. NPRL2 KO impairs lysosomal acidification and lysosomal gene expression, defective cobalamin-dependent methionine synthesis from homocysteine, and defective processing of the cobalamin-transport protein transcobalamin 2. These defects are rescued by cyanocobalamin supplementation, placing NPRL2 upstream of lysosomal-dependent cobalamin processing and methionine synthesis.\",\n      \"method\": \"Conditional knockout mouse model, metabolomics, cell fractionation, rescue experiments with cyanocobalamin\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple KO models with defined biochemical phenotypes, rescue experiments, and multiple orthogonal methods\",\n      \"pmids\": [\"26166573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NPRL2/TUSC4 forms a complex with PDK1 via its N-terminal 133 amino acid residues and suppresses Src-dependent tyrosine phosphorylation and activation of PDK1 in vitro and in cells. Deletion of the N-terminal domain abolishes this inhibitory effect, indicating complex formation is required for PDK1 inactivation.\",\n      \"method\": \"E. coli two-hybrid screening, co-immunoprecipitation, in vitro kinase assay, deletion mutagenesis, siRNA knockdown\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical interaction mapped by deletion mutagenesis with in vitro kinase assay, but single lab\",\n      \"pmids\": [\"18616680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NPRL2/TUSC4 physically interacts with the E3 ubiquitin ligase HERC2, preventing BRCA1 degradation through the ubiquitination pathway. TUSC4 silencing enhances BRCA1 polyubiquitination and degradation, reducing homologous recombination repair efficiency.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, gene expression profiling, HR repair assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, functional ubiquitination assay, HR repair readout; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"25480944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NPRL2 interacts with Raptor in amino acid sufficiency to activate mTORC1, while it interacts with RagD (particularly RagA(GDP)/RagD(GTP) heterodimer) in amino acid scarcity to inhibit mTORC1. A reciprocal relationship exists between NPRL2 binding to Rag GTPases and Raptor, supporting a 'seesaw' model of mTORC1 regulation.\",\n      \"method\": \"Co-immunoprecipitation, dominant positive/negative Rag GTPase mutants, lysosomal localization by immunofluorescence, Drosophila genetic model\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with mutant validation and in vivo Drosophila confirmation, single lab\",\n      \"pmids\": [\"26582740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Ectopic overexpression of NPRL2 in cells with active p53 induces NOX2-dependent reactive oxygen species production and DNA damage. Overexpressed NPRL2 accumulates in the nucleus together with apoptosis-inducing factor (AIF), triggering p53 phosphorylation, DNA damage response, and G1 arrest followed by apoptosis. In p53-negative cells, NPRL2 overexpression activates CHK1 or CHK2 and induces S or G2/M arrest.\",\n      \"method\": \"Overexpression, immunofluorescence, ROS assay, cell cycle analysis, co-localization with AIF\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple orthogonal methods (ROS assay, nuclear localization, checkpoint activation) in single lab; overexpression system\",\n      \"pmids\": [\"29127423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Yeast Npr2 (ortholog of human NPRL2) is a phosphorylation-dependent substrate of the SCF(Grr1) E3 ubiquitin ligase. Phosphorylation by casein kinases Yck1 and Yck2 destabilizes Npr2; it accumulates in grr1Δ mutants and is stabilized when the proteasome is inhibited. Npr2 is required for robust growth on ammonium or urea as nitrogen sources and for meiosis completion.\",\n      \"method\": \"Mass spectrometry interaction, genetic analysis of grr1Δ mutants, proteasome inhibition, overexpression lethality assay\",\n      \"journal\": \"Eukaryotic cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-identified interaction with genetic and biochemical validation; ortholog in yeast with multiple supporting experiments\",\n      \"pmids\": [\"20154027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Restoration of NPRL2 in cisplatin-resistant NSCLC cells activates ATM kinase in response to cisplatin, promotes downstream γ-H2AX formation, increases CHK1 and CHK2 kinase activity, and elevates cell cycle checkpoint proteins CDC25A and CDC25C, leading to G2/M arrest and apoptosis.\",\n      \"method\": \"NPRL2 gene transfection/re-expression, Western blot for ATM/γ-H2AX/CHK1/CHK2/CDC25, flow cytometry for cell cycle, in vivo xenograft\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — defined mechanistic pathway (ATM-CHK1/2-CDC25 axis) validated in vitro and in vivo, single lab with multiple markers\",\n      \"pmids\": [\"20700484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of NPRL2 in mouse excitatory glutamatergic neurons increases mTORC1-dependent signaling, reduces dendritic branching, and increases voltage-gated sodium channel expression (specifically Scn1A). Treatment with rapamycin prevents Scn1A upregulation, placing NPRL2-mTORC1 axis upstream of sodium channel regulation.\",\n      \"method\": \"Conditional neuronal knockout, electrophysiology (action potential recording), immunofluorescence, rapamycin rescue, primary neuron culture\",\n      \"journal\": \"eNeuro\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with pharmacological rescue establishing mechanistic pathway; single lab\",\n      \"pmids\": [\"35165201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Neocortical loss of Nprl2 in mice increases mTORC1 signaling, causes spontaneous seizures, abnormal synaptic function (increased excitatory, decreased inhibitory currents), and elevates glycine levels. Glycine actions on NMDA receptors contribute to the electrophysiological and survival phenotypes, linking NPRL2 loss to altered amino acid/neurotransmitter metabolism.\",\n      \"method\": \"Conditional KO mouse, electrophysiology (EPSC/IPSC), proteomics, metabolomics, pharmacological NMDA receptor manipulation\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (electrophysiology, metabolomics, pharmacological rescue) in single lab\",\n      \"pmids\": [\"35602938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Conditional deletion of Nprl2 from mouse dorsal telencephalon (Emx1cre) causes spontaneous seizures and dysmorphic enlarged neuronal cells with increased mTORC1 signaling. Chronic rapamycin administration inhibits seizure occurrence and extends survival but does not rescue enlarged neuronal cells.\",\n      \"method\": \"Conditional knockout mouse model, EEG seizure recording, histology, rapamycin treatment\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with pharmacological intervention establishing mTORC1 dependence; single lab\",\n      \"pmids\": [\"34965576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HSP70 mediates CHIP-induced polyubiquitination and proteasomal degradation of NPRL2. CHIP (the chaperone-associated E3 ubiquitin ligase) interacts with NPRL2 to promote its degradation; HSP70 overexpression enhances whereas HSP70 depletion inhibits amino acid-induced mTORC1 activation. HSP70 knockdown promotes basal autophagic flux and inhibits cell growth.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, HSP70 overexpression/knockdown, mTORC1 activity assay, autophagy flux assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, and functional mTORC1 readout; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"39495541\"],\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 and facilitates degradation of substrates of Cullin-RING E3 ubiquitin ligases.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, ubiquitination assay, CCK-8, in vivo xenograft\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP validated interaction with mechanistic follow-up on ubiquitination and neddylation; single lab\",\n      \"pmids\": [\"33905671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NPRL2 upregulates TRIM16 expression via inactivation of ERK1/2 signaling. TRIM16 in turn promotes ubiquitination-mediated degradation of Galectin-3 (Gal-3), reducing Gal-3 release from glioma cells. Secreted Gal-3 accelerates copper uptake and triggers cuproptosis in CD8+ T cells, so NPRL2 expression protects CD8+ T cells from cuproptosis in glioma.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, flow cytometry for cuproptosis, Western blot for ERK signaling, clinical specimen correlation\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP for TRIM16-Gal3 interaction, functional cuproptosis assay; single lab\",\n      \"pmids\": [\"39367988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Following radiation, NPRL2 translocates from the GATOR1 complex to the nucleus via AMPK-mediated phosphorylation of WDR24. In the nucleus, NPRL2 directly binds to the catalytic domains of E3 ubiquitin ligases HERC2 and RNF8, inactivating them and preventing degradation of DNA repair proteins, thereby promoting radioresistance.\",\n      \"method\": \"Nuclear fractionation, co-immunoprecipitation, AMPK inhibition, in vitro and in vivo radiosensitivity assays, domain binding assays\",\n      \"journal\": \"Acta pharmaceutica Sinica. B\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding to E3 ligase catalytic domains with nuclear localization experiment and pharmacological rescue; single lab\",\n      \"pmids\": [\"41584340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NPRL2 interacts with PRRSV Nsp1α via its C-terminal domain and mediates K63-linked ubiquitination of Nsp1α at lysine 150, targeting it for autophagic degradation. NPRL2 overexpression inhibits PRRSV replication; knockdown enhances viral propagation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay (K63-linkage specific), autophagic flux assay (LC3-II), viral replication assay, domain mapping\",\n      \"journal\": \"Veterinary research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-mapped interaction with mechanistic ubiquitination and autophagic degradation assays; single lab\",\n      \"pmids\": [\"41742785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NPRL2 protein contains a bipartite nuclear localization signal, a protein-binding domain, similarity to the MutS core domain, and a nitrogen permease regulator 2 domain. The yeast ortholog NPR2 shares 32-36% identity. Re-expression of NPRL2 suppresses tumor growth in SCID mice and inhibits tumor cell growth in vitro.\",\n      \"method\": \"Sequence analysis, tet-controlled transgene expression, SCID mouse tumor suppression assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — domain characterization by sequence analysis with tumor suppression assay; mechanistic detail is limited\",\n      \"pmids\": [\"15374952\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NPRL2 is an essential catalytic subunit of the GATOR1 complex that inhibits mTORC1 by acting as the arginine-finger GAP (via Arg-78) to stimulate GTP hydrolysis by RagA; it localizes to lysosomes/autolysosomes where it senses amino acid sufficiency, and its stability is regulated by HSP70/CHIP-mediated ubiquitination and proteasomal degradation as well as SCF(Grr1)-dependent phosphodegron pathways in yeast. Beyond mTORC1, NPRL2 modulates PDK1 activity by direct binding, regulates BRCA1 stability via interaction with the E3 ligase HERC2, controls lysosomal cobalamin processing and methionine homeostasis, and upon radiation translocates to the nucleus to inhibit E3 ligases HERC2 and RNF8 through an AMPK/WDR24 axis, collectively positioning NPRL2 as a multi-functional regulator of nutrient sensing, DNA damage response, and lysosomal metabolism.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NPRL2 is the catalytic subunit of the lysosomal GATOR1 complex, where it functions as the GTPase-activating protein that couples amino acid availability to mTORC1 signaling [#0, #1]. It provides the catalytic arginine finger (Arg-78) that stimulates GTP hydrolysis by RagA, and mutation of this residue renders mTORC1 insensitive to amino acid starvation [#0]; in concert with its partner Nprl3 it localizes to lysosomes and autolysosomes and restrains TORC1 during nutrient scarcity, cooperating with the Tsc1/2 axis [#1]. NPRL2 toggles between Raptor binding in amino acid sufficiency and Rag GTPase binding in scarcity, implementing a reciprocal 'seesaw' control of mTORC1 [#5]. In vivo, loss of NPRL2 elevates mTORC1 signaling and produces neuronal hypertrophy, altered excitatory/inhibitory balance, sodium channel (Scn1A) upregulation, and spontaneous seizures, phenotypes rescued by rapamycin [#9, #10, #11]. Beyond nutrient sensing, NPRL2 is required for lysosomal acidification and cobalamin-dependent methionine synthesis [#2]. Its own abundance is set by ubiquitin-proteasome control: HSP70 directs CHIP-mediated polyubiquitination and degradation of NPRL2, while UBE2M binding stabilizes it [#12, #13]. NPRL2 additionally engages the DNA damage response, restoring checkpoint signaling through the ATM–CHK1/2–CDC25 axis [#8] and, upon radiation, translocating to the nucleus via AMPK-mediated WDR24 phosphorylation to directly inhibit the E3 ligases HERC2 and RNF8 and protect DNA repair proteins [#15]. Functional links to PDK1 inhibition [#3] and HERC2-dependent BRCA1 stabilization [#4] further extend its regulatory reach.\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established NPRL2 as a candidate tumor suppressor and defined its domain architecture, framing it as a multidomain nuclear/protein-binding protein before any mechanism was known.\",\n      \"evidence\": \"Sequence analysis and tet-controlled re-expression with SCID mouse tumor suppression assay\",\n      \"pmids\": [\"15374952\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Domain assignments are computational, not structurally validated\", \"No molecular mechanism for tumor suppression defined\", \"MutS-core similarity has no demonstrated biochemical function\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Provided an early biochemical activity by showing NPRL2 binds PDK1 and suppresses its Src-dependent activation, the first defined protein-protein mechanism.\",\n      \"evidence\": \"Two-hybrid screen, co-IP, in vitro kinase assay, and deletion mutagenesis in cells\",\n      \"pmids\": [\"18616680\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab without reciprocal in vivo validation\", \"Relationship to GATOR1/mTORC1 role unclear\", \"Physiological context of PDK1 inhibition not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected NPRL2 to the DNA damage response and revealed conserved proteasomal control of the protein via the yeast ortholog.\",\n      \"evidence\": \"NPRL2 re-expression in cisplatin-resistant NSCLC with checkpoint marker analysis and xenografts; yeast Npr2 SCF(Grr1) phosphodegron genetics and proteasome inhibition\",\n      \"pmids\": [\"20700484\", \"20154027\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ATM-CHK1/2 activation is direct or downstream of altered signaling is unresolved\", \"Casein-kinase phosphodegron not mapped onto human NPRL2\", \"Connection between checkpoint role and nutrient sensing not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined NPRL2 as a lysosome-localized TORC1 inhibitor acting with Nprl3 and Tsc1/2, and separately as an HERC2-binding stabilizer of BRCA1, establishing both its nutrient-sensing and genome-maintenance arms.\",\n      \"evidence\": \"Drosophila co-IP, immunofluorescence, genetic epistasis with Tsc1/2; human co-IP, ubiquitination and HR repair assays\",\n      \"pmids\": [\"24786828\", \"25480944\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which NPRL2 prevents HERC2-mediated BRCA1 ubiquitination not biochemically reconstituted\", \"Quantitative contribution of Nprl2/3 versus Tsc1/2 to TORC1 control unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Built the molecular logic of mTORC1 control by showing NPRL2 binds Raptor in nutrient sufficiency and Rag GTPases in scarcity, and demonstrated NPRL2 is required for lysosomal cobalamin/methionine metabolism in vivo.\",\n      \"evidence\": \"Co-IP with Rag mutants and Drosophila genetics; conditional KO mouse, metabolomics, and cyanocobalamin rescue\",\n      \"pmids\": [\"26582740\", \"26166573\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of the Raptor/Rag binding switch not resolved\", \"Mechanism linking NPRL2 to lysosomal acidification and transcobalamin 2 processing undefined\", \"Whether cobalamin defect is GATOR1-dependent unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed that supraphysiological NPRL2 drives ROS-dependent DNA damage and checkpoint-mediated arrest, with outcomes branching on p53 status.\",\n      \"evidence\": \"Overexpression with ROS assay, nuclear co-localization with AIF, and cell cycle analysis\",\n      \"pmids\": [\"29127423\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression system may not reflect endogenous function\", \"How NOX2/ROS induction connects to GATOR1 role unknown\", \"Nuclear AIF co-localization mechanism not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Pinpointed Arg-78 as the catalytic arginine finger driving GATOR1 GAP activity toward RagA, defining the precise enzymatic basis of NPRL2-dependent mTORC1 inhibition.\",\n      \"evidence\": \"Site-directed mutagenesis, in vitro GTP hydrolysis assay, co-IP, and structural analysis\",\n      \"pmids\": [\"30651352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulation of GAP activity by upstream signals not addressed\", \"Does not connect catalytic mechanism to non-mTORC1 functions\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established the in vivo consequences of NPRL2 loss in neurons as mTORC1-driven, linking it to seizures, neuronal hypertrophy, synaptic imbalance, and neurotransmitter metabolism.\",\n      \"evidence\": \"Conditional neuronal/neocortical KO mice with electrophysiology, metabolomics, EEG, and rapamycin rescue\",\n      \"pmids\": [\"35165201\", \"35602938\", \"34965576\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Rapamycin does not rescue cell enlargement, indicating mTORC1-independent effects\", \"Mechanism linking NPRL2 loss to glycine elevation and Scn1A upregulation incomplete\", \"Single-lineage conditional models limit generalization\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined opposing ubiquitin-system inputs that set NPRL2 abundance—HSP70/CHIP-driven degradation versus UBE2M-mediated stabilization—and extended NPRL2 into tumor immune regulation.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, HSP70 and UBE2M manipulation, mTORC1 and autophagy flux readouts; TRIM16/Gal-3 cuproptosis assays in glioma\",\n      \"pmids\": [\"39495541\", \"33905671\", \"39367988\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degradation and stabilization pathways not reconciled into a single regulatory model\", \"ERK1/2–TRIM16–Gal-3 axis is correlative regarding direct NPRL2 enzymatic involvement\", \"Single-lab findings without independent replication\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a signal-induced relocalization mechanism whereby radiation triggers AMPK/WDR24-dependent nuclear translocation of NPRL2 to directly inhibit HERC2 and RNF8 and confer radioresistance.\",\n      \"evidence\": \"Nuclear fractionation, domain-binding assays to E3 ligase catalytic domains, AMPK inhibition, and radiosensitivity assays in vitro and in vivo\",\n      \"pmids\": [\"41584340\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How NPRL2 dissociates from GATOR1 mechanistically not fully defined\", \"Stoichiometry of nuclear versus lysosomal pools unknown\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Extended NPRL2 to antiviral defense by showing it mediates K63-linked ubiquitination of PRRSV Nsp1α to drive its autophagic degradation.\",\n      \"evidence\": \"Co-IP, K63-linkage-specific ubiquitination assay, LC3-II autophagy flux, viral replication assay, and domain mapping\",\n      \"pmids\": [\"41742785\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NPRL2 acts as an E3 ligase or adaptor in this ubiquitination is undefined\", \"Relationship to GATOR1/autophagy regulation unclear\", \"Single-lab, single-virus context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NPRL2's distinct activities—GATOR1 GAP catalysis, nuclear E3-ligase inhibition, ubiquitin-system control, and lysosomal cobalamin metabolism—are integrated and switched within one cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model reconciling lysosomal GAP function with nuclear and metabolic roles\", \"Upstream regulation determining which function dominates is unknown\", \"Structural basis for context-dependent partner switching not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [12, 16]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [8, 15]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 10]}\n    ],\n    \"complexes\": [\"GATOR1\"],\n    \"partners\": [\"NPRL3\", \"RagA\", \"RagD\", \"RPTOR\", \"HERC2\", \"RNF8\", \"PDK1\", \"UBE2M\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}