{"gene":"NME1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1992,"finding":"NM23-H1 (nm23-H1) and NM23-H2 proteins both exhibit nucleoside diphosphate kinase (NDPK) enzymatic activity, catalyzing phosphotransfer from ATP to nucleoside diphosphates (e.g., GDP→GTP) via a phosphoenzyme intermediate; recombinant GST-fusion proteins expressed in E. coli formed [32P]-phosphoenzyme intermediates and converted GDP to GTP as shown by TLC.","method":"In vitro enzymatic assay with recombinant GST-fusion proteins; [γ-32P]ATP phosphoenzyme intermediate formation; TLC detection of GTP synthesis","journal":"International journal of oncology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro reconstitution of enzymatic activity with purified recombinant protein, replicated across both H1 and H2 isoforms","pmids":["21584562"],"is_preprint":false},{"year":2001,"finding":"NM23-H1 binds to and cleaves the C-rich strand of the PDGF-A promoter nuclease-hypersensitive element (5'-SHS) at distinct 3'-sites relative to NM23-H2, and both proteins repress PDGF-A promoter-driven transcription in HepG2 cells, revealing a DNA-binding/cleavage-dependent transcriptional repression mechanism.","method":"Screening of HeLa cDNA expression library with PDGF-A silencer C-rich strand; recombinant protein DNA cleavage assays; transient transfection reporter assays in HepG2 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro DNA cleavage assay with recombinant protein plus functional transcription reporter assay; single lab but two orthogonal methods","pmids":["11694515"],"is_preprint":false},{"year":2004,"finding":"NM23-H1 possesses intrinsic 3'-5' exonuclease activity that excises single nucleotides stepwise from DNA 3' termini in a Mg2+-dependent manner, preferring single-stranded substrates or mismatched 3' ends; Lys12 is critical for catalysis, as K12Q substitution greatly diminishes activity.","method":"In vitro exonuclease assay with recombinant wild-type and K12Q mutant NM23-H1; hydroxylapatite and gel filtration HPLC co-purification; inhibition by ATP and cordycepin incorporation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of novel enzymatic activity with purified recombinant protein plus active-site mutagenesis, single lab","pmids":["14960567"],"is_preprint":false},{"year":1999,"finding":"Human PRUNE protein physically interacts with NM23-H1 (the human homolog of Drosophila awd), as demonstrated by yeast two-hybrid interaction-mating and in vitro co-immunoprecipitation; the NM23-H1 S120G gain-of-function mutant loses this interaction. PRUNE and NM23-H1 partially co-localize in the cytoplasm.","method":"Yeast two-hybrid interaction-mating; in vitro co-immunoprecipitation; confocal co-localization","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal yeast 2-hybrid plus co-IP plus co-localization, single lab, three methods converging on same conclusion","pmids":["10602478"],"is_preprint":false},{"year":2007,"finding":"NM23-H1 suppresses tumor cell motility at least in part by transcriptionally down-regulating the lysophosphatidic acid receptor EDG2 (LPA1); mutants P96S and S120G fail to down-regulate EDG2 and fail to suppress motility; EDG2 overexpression in NM23-H1-expressing cells restores motility 60-fold.","method":"Expression microarray of MDA-MB-435 cells overexpressing wild-type vs. mutant NM23-H1; transfection/in vitro motility (Boyden chamber) assays; EDG2 siRNA knockdown","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — microarray plus functional rescue transfection plus siRNA knockdown, independently confirmed in a companion in vivo study (PMID:18089805)","pmids":["17671192","18089805"],"is_preprint":false},{"year":2007,"finding":"NM23-H1 transcriptional down-regulation of EDG2/LPA1 is functionally critical for metastasis suppression in vivo: EDG2 co-expression with NM23-H1 restored cell lung retention 8–13-fold and restored pulmonary metastasis incidence from 51.9% to 90.4% in spontaneous metastasis assay. Human breast carcinoma cohort showed a statistically significant inverse correlation (r=−0.73) between NM23-H1 and EDG2 protein levels.","method":"Fluorescent cell tracking/ex vivo microscopy for lung retention; spontaneous metastasis xenograft assay; in vitro motility/invasion assays; human tumor cohort immunohistochemistry","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal in vitro and in vivo methods, human tissue validation, single lab but comprehensive study","pmids":["18089805"],"is_preprint":false},{"year":2007,"finding":"NM23-H1 and its binding partner STRAP directly bind to p53's central DNA-binding domain (residues 113–290) via NM23-H1 Cys145 and p53 Cys176; this complex potentiates p53-mediated transcription, apoptosis, and growth inhibition, and works by displacing Mdm2 from the p53–Mdm2 complex.","method":"Co-immunoprecipitation; domain-mapping with deletion/point mutants; luciferase reporter transcription assays; apoptosis and growth inhibition assays; siRNA knockdown of NM23-H1/STRAP","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP plus mutagenesis plus functional reporter assays, single lab, multiple orthogonal methods","pmids":["17916563"],"is_preprint":false},{"year":2011,"finding":"The 3'-5' exonuclease activity of NM23-H1 is necessary for its metastasis suppressor function in vivo: exonuclease-deficient mutants E5A and K12Q failed to suppress spontaneous lung metastasis of 1205LU melanoma cells in mice, while retaining the ability to suppress motility/invasion in culture, indicating the exonuclease contributes specifically to in vivo metastasis suppression.","method":"Site-directed mutagenesis; in vitro exonuclease and NDPK assays; stable transfection of melanoma cell lines; spontaneous lung metastasis xenograft assay; in vitro Boyden chamber motility/invasion assays","journal":"International journal of cancer","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro enzymatic characterization of mutants plus in vivo metastasis assay, single lab but multiple orthogonal methods","pmids":["20209495"],"is_preprint":false},{"year":2011,"finding":"NM23-H1 promotes repair of UV-induced (6-4) photoproduct DNA damage; NM23-H1 deficiency compromised nucleotide excision repair kinetics; NM23-H1 rapidly translocated to sites of UV-induced DNA damage in the nucleus; its kinase activity was critical for rapid repair and 3'-5' exonuclease activity dominant in suppression of UV-induced mutagenesis. Nm23-M1/M2 hemizygous-null transgenic mice developed UV-induced melanoma.","method":"DNA repair kinetics assay (total polymerase-blocking lesions; (6-4) photoproduct NER); nuclear translocation imaging; transgenic knockout mouse UV-induced melanoma model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (DNA repair assay, live-cell imaging, in vivo transgenic model) in a single study with rigorous controls","pmids":["22080566"],"is_preprint":false},{"year":2010,"finding":"NM23-H1 provides a local source of GTP for the GTPase dynamin during cytokinesis; loss of NM23-H1 in diploid cells causes cytokinetic furrow regression and cytokinesis failure generating tetraploid cells; dynamin loss phenocopies NM23-H1 loss; ectopic overexpression of dynamin complements NM23-H1 loss.","method":"RNAi knockdown; live-cell imaging of cytokinesis; ectopic dynamin overexpression rescue; flow cytometry for ploidy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (complementation) plus live imaging plus RNAi phenotype, single lab, multiple orthogonal approaches","pmids":["20713695"],"is_preprint":false},{"year":2009,"finding":"NM23-H1 NDPK enzymatic activity is regulated by oxidative modification of Cys109: H2O2-induced oxidation (intra/inter-disulfide, glutathionylation, sulfonic acid) inhibits NDPK activity and metastasis suppressor activity; thioredoxin reductase 1 (TrxR1) interacts specifically with oxidized NM23-H1 and restores NDPK activity via the NADPH-TrxR1-thioredoxin shuttle. C109A mutant retains both activities under oxidative stress.","method":"UPLC-ESI-q-TOF tandem MS for oxidation-site identification; in vitro NDPK activity assay; co-immunoprecipitation of TrxR1; in vitro TrxR1 reduction assay; site-directed mutagenesis (C109A); metastasis suppressor activity assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mass spectrometry identification of modification sites plus enzymatic assays plus mutagenesis plus co-IP, single lab, multiple orthogonal methods","pmids":["19956735"],"is_preprint":false},{"year":2013,"finding":"Oxidative conditions cause an intramolecular disulfide bond between Cys4 and Cys145 in NM23-H1, triggering a large conformational change that dissociates the functional hexamer into dimers; this structural change facilitates further oxidation of Cys109 to sulfonic acid. Crystal structure of oxidized NM23-H1 was determined.","method":"X-ray crystallography; hydrogen/deuterium-exchange experiments; nanoUPLC-ESI-q-TOF tandem MS peptide sequencing","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure determination plus HDX and MS validation, single lab but rigorous structural/biophysical study","pmids":["23519676"],"is_preprint":false},{"year":2001,"finding":"NM23-H1 (rat homolog Nm23-R1/NDPKbeta) localizes to the centrosome in dividing and non-dividing cells, is catalytically active there, and co-immunoprecipitates with γ-tubulin, a core centrosomal protein essential for microtubule nucleation.","method":"Confocal laser scanning microscopy; biochemical centrosome purification; co-immunoprecipitation with γ-tubulin","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — subcellular fractionation/purification plus co-IP plus imaging, single lab; ortholog study (rat/human)","pmids":["11139339"],"is_preprint":false},{"year":2012,"finding":"NM23-H1 is essential for contact inhibition of locomotion (CIL) by suppressing Rac1 through inactivation of Tiam1 at cell-cell contact sites; NM23-H1 translocates to contact sites via association with α-catenin and N-cadherin; ephrin-B1 disrupts CIL by inhibiting NM23-H1 association with Tiam1, activating Rac1.","method":"Spheroid confrontation invasion assay; siRNA knockdown; transfection of NM23-H1 binding mutants; co-immunoprecipitation of NM23-H1 with α-catenin, N-cadherin, and Tiam1; Rac1 activity assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IPs plus functional mutant rescue plus invasion assay, single lab, multiple orthogonal methods","pmids":["22718351"],"is_preprint":false},{"year":2010,"finding":"NM23-H1 overexpression suppresses hepatocarcinoma cell adhesion and migration on fibronectin by impairing glycosylation of integrin β1, reducing mature β1 integrin on the cell surface (while mRNA levels are unchanged) and attenuating FAK phosphorylation.","method":"Stable transfection of NM23-H1; adhesion and wound-healing migration assays on fibronectin; flow cytometry for surface integrin; Western blot for mature vs. precursor integrin β1 isoforms; tunicamycin deglycosylation control","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional cell assays plus biochemical glycosylation analysis, single lab, multiple convergent methods","pmids":["20618991"],"is_preprint":false},{"year":2012,"finding":"NM23-H1 negatively regulates TGF-β1-induced epithelial-mesenchymal transition (EMT) in lung cancer cells; NM23-H1 knockdown enhanced TGF-β1-induced loss of E-cadherin and upregulation of β-catenin and fibronectin; this effect was Snail-dependent and involved Src kinase; ectopic re-expression of shRNA-resistant NM23-H1 reversed the knockdown phenotype.","method":"siRNA/shRNA knockdown; ectopic NM23-H1 re-expression rescue; Western blot for EMT markers; invasion/migration assays; Snail and Src kinase involvement assessed","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — siRNA/rescue experiment with multiple EMT markers, single lab, moderate mechanistic resolution","pmids":["23137649"],"is_preprint":false},{"year":2010,"finding":"NM23-H1 forms a complex with transcription factor AP-1 and with p53 in B cells; NM23-H1 expression down-regulates cyclin D1 promoter activity in a dose-responsive manner, inducing cell cycle arrest and apoptosis (upregulating caspase 3/9, Bcl-x, p53; reducing cyclin D1).","method":"Microarray pathway analysis; real-time PCR validation; promoter-reporter (cyclin D1) assay; co-immunoprecipitation of NM23-H1 with AP-1 and p53; proliferation and apoptosis assays","journal":"Cancer biology & therapy","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP plus promoter assay plus multiple functional readouts, single lab","pmids":["20448457"],"is_preprint":false},{"year":2009,"finding":"NM23-H1 interacts with Cdc42 (endogenous proteins), as validated by reciprocal co-immunoprecipitation in K562 leukemia cells; NM23-H1 knockdown reduced Cdc42 protein expression and impaired megakaryocytic differentiation.","method":"Reciprocal co-immunoprecipitation; functional proteomics (2D-DIGE/MS); flow cytometry (CD41); ploidy analysis","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal co-IP validated plus functional proteomics, single lab","pmids":["19302816"],"is_preprint":false},{"year":2011,"finding":"KSHV-encoded LANA promotes nuclear translocation of NM23-H1; nuclear NM23-H1 is required for Ras-BRaf-MAPK pathway activation and cell invasiveness induced by KSHV; cytoplasmic overexpression of NM23-H1 (via DNA demethylation agent) reduced KSHV-associated MAPK activation and invasiveness.","method":"Subcellular fractionation; confocal imaging; siRNA knockdown; ectopic LANA expression; MAPK pathway activation assays; invasion assays; pharmacologic DNA methylation inhibitor","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — subcellular localization experiments with functional consequence, multiple complementary approaches, single lab","pmids":["21270158"],"is_preprint":false},{"year":2013,"finding":"NM23-H1/h-Prune complex formation identified by NMR spectroscopy of h-Prune C-terminal domain; a competitive permeable peptide (CPP) disrupting the Nm23-H1/h-Prune complex impaired cell motility, tumor growth, and metastasis formation in neuroblastoma models.","method":"NMR spectroscopy conformational analysis; competitive peptide inhibitor (CPP) design; cell motility assays; in vivo xenograft tumor growth and metastasis assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — NMR structural analysis of binding interface plus functional in vivo validation, single lab","pmids":["23448979"],"is_preprint":false},{"year":2017,"finding":"NME1 (NM23-H1) physically interacts with IRF6 in the cytoplasm of palatal epithelial cells; this interaction is enhanced by phosphorylation of key serine residues in the IRF6 C-terminus. CLP-associated NME1 missense mutation R18Q disrupts IRF6 binding and leads to elevated Rac1 and RhoA activation.","method":"Yeast two-hybrid screen; co-immunoprecipitation; in vivo co-localization in primary palatal epithelial cells; Rac1/RhoA activation assays; patient variant functional testing","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — yeast 2-hybrid plus co-IP plus in vivo co-localization plus functional Rho assays, single lab","pmids":["28767310"],"is_preprint":false},{"year":2017,"finding":"NME1 (NM23-H1) and NME2 act as protein histidine kinases that phosphorylate histidine residues on themselves (via His118 phosphohistidine intermediate) and on substrate proteins; anti-pHis antibodies detected pH118-NME1/2 and multiple pHis-containing proteins in neuroblastoma cell lines and xenograft tumors.","method":"Anti-1- and 3-pHis monoclonal antibodies; anti-pH118 NME1/2 polyclonal antibodies; immunoblotting of neuroblastoma cell lines and xenograft tumor lysates","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — antibody-based detection of phosphohistidine in cells, single lab; method relies on specificity of novel antibodies without additional orthogonal validation in this paper","pmids":["32392889"],"is_preprint":false},{"year":2020,"finding":"GDF5 neurotrophic factor increases NME1 expression in SH-SY5Y neuronal cells and in adult rat brain in vivo; NME1 expression is necessary and sufficient for GDF5-promoted neurite growth; exogenous NME1 protein treatment increased neurite growth in SH-SY5Y cells and in cultured midbrain dopaminergic neurons.","method":"Proteomics analysis; in vivo GDF5 overexpression in rat brain; siRNA knockdown; ectopic expression; quantitative neurite growth assays in SH-SY5Y and primary mDA neurons","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — proteomics plus in vitro/in vivo functional assays with knockdown and overexpression, single lab","pmids":["32853992"],"is_preprint":false},{"year":2023,"finding":"NSUN6 methyltransferase regulates NM23-H1 mRNA expression by depositing m5C modification on the 3'-UTR of NM23-H1 mRNA, stabilizing/promoting its expression; NSUN6 overexpression restricts lung cancer cell proliferation, migration, and EMT via elevated NM23-H1.","method":"m5C RIP (methylated RNA immunoprecipitation); dot blot; luciferase assay; qRT-PCR/Western blot; functional cell assays (CCK-8, wound-healing, transwell); in vivo xenograft","journal":"Medical principles and practice","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — m5C RIP plus luciferase reporter plus functional assays, single lab, multiple convergent methods","pmids":["38029727"],"is_preprint":false},{"year":2021,"finding":"Transcription factors CTCF and EGR1 bind the proximal NM23-H1 promoter and induce NM23-H1 expression, thereby reducing MDA-MB-231 breast cancer cell migration; loss of CTCF and EGR1 in aggressive breast cancer cells correlates with reduced NM23-H1 levels.","method":"Promoter truncation/luciferase reporter analysis; ChIP (chromatin immunoprecipitation) of CTCF and EGR1 at NM23-H1 promoter; ectopic CTCF/EGR1 expression; wound-healing migration assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ChIP plus promoter reporter plus functional migration assay, single lab","pmids":["33436746"],"is_preprint":false},{"year":1997,"finding":"NM23-H1 down-regulation by antisense oligonucleotides or stable antisense-transfection in MCF10A cells directly inhibits cell proliferation, demonstrating a role for NM23-H1 in cell cycle progression.","method":"Antisense oligonucleotide treatment; stable antisense transfection; cell proliferation assay; cell cycle synchronization and S-phase analysis","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — antisense loss-of-function with proliferation readout, single lab, two complementary antisense strategies","pmids":["9335458"],"is_preprint":false}],"current_model":"NME1/NM23-H1 is a multifunctional metastasis suppressor that: (1) catalyzes nucleoside diphosphate phosphorylation (NDPK activity) via a phosphohistidine intermediate; (2) possesses 3'-5' exonuclease activity (requiring Lys12, Glu5) that is necessary for in vivo metastasis suppression and DNA repair after UV damage; (3) acts as a protein histidine kinase (autophosphorylating His118) that phosphorylates substrates such as KSR to suppress Ras/MAPK signaling; (4) transcriptionally represses the LPA receptor EDG2/LPA1 to suppress cell motility and metastatic colonization; (5) suppresses Rac1 activity through Tiam1 inactivation at cell-cell contacts to enforce contact inhibition of locomotion; (6) provides local GTP to dynamin during cytokinesis to prevent furrow regression and chromosomal instability; (7) localizes to centrosomes where it co-immunoprecipitates with γ-tubulin; (8) interacts with PRUNE/h-Prune, p53 (via STRAP), AP-1, Cdc42, α-catenin/N-cadherin, and IRF6; and (9) has its enzymatic activities regulated by oxidation of Cys109 (inhibitory) and intramolecular Cys4–Cys145 disulfide formation (hexamer destabilization), with restoration by the TrxR1/thioredoxin system."},"narrative":{"mechanistic_narrative":"NME1/NM23-H1 is a multifunctional metastasis suppressor whose anti-metastatic activity integrates several biochemically distinct enzymatic functions with control of cell motility and genome stability [PMID:20209495, PMID:17671192, PMID:18089805]. Its founding biochemistry is nucleoside diphosphate kinase (NDPK) activity, transferring phosphate from ATP to nucleoside diphosphates via a phosphoenzyme intermediate [PMID:21584562], and during cytokinesis this provides a local GTP source for the GTPase dynamin, so that loss of NME1 causes furrow regression, cytokinesis failure, and tetraploidy [PMID:20713695]. NME1 additionally possesses an intrinsic Mg2+-dependent 3'-5' exonuclease activity dependent on Lys12 that excises nucleotides from DNA 3' termini [PMID:14960567]; this exonuclease, together with its kinase activity, supports repair of UV-induced (6-4) photoproducts and is specifically required for metastasis suppression in vivo, as exonuclease-dead E5A/K12Q mutants fail to suppress lung metastasis while retaining anti-motility activity in culture [PMID:20209495, PMID:22080566]. NME1 also acts in the nucleus, binding and cleaving the C-rich strand of the PDGF-A promoter to repress transcription [PMID:11694515] and transcriptionally down-regulating the lysophosphatidic acid receptor EDG2/LPA1, an event functionally critical for suppressing motility and pulmonary metastatic colonization [PMID:17671192, PMID:18089805]. At cell-cell contacts NME1 enforces contact inhibition of locomotion by associating with alpha-catenin and N-cadherin and inactivating Tiam1 to suppress Rac1 [PMID:22718351]. It engages multiple partners including PRUNE/h-Prune [PMID:10602478, PMID:23448979], the p53 DNA-binding domain via STRAP to potentiate p53 activity by displacing Mdm2 [PMID:17916563], Cdc42 [PMID:19302816], and IRF6, where the cleft/lip-palate-associated R18Q mutation disrupts IRF6 binding and elevates Rac1/RhoA [PMID:28767310]. Its enzymatic activities are redox-regulated: oxidation of Cys109 inhibits NDPK and metastasis-suppressor function with restoration by the TrxR1/thioredoxin system [PMID:19956735], while a Cys4-Cys145 intramolecular disulfide drives a conformational change dissociating the active hexamer into dimers [PMID:23519676]. NME1 functions as a protein histidine kinase that autophosphorylates His118 and phosphorylates substrate proteins [PMID:32392889].","teleology":[{"year":1992,"claim":"Established the core biochemical identity of NM23-H1 as a nucleoside diphosphate kinase, defining the enzymatic activity that frames all later mechanistic work.","evidence":"In vitro phosphoenzyme intermediate formation and TLC detection of GDP-to-GTP conversion with recombinant GST-fusion proteins","pmids":["21584562"],"confidence":"High","gaps":["Does not connect NDPK activity to any cellular phenotype","Does not explain how a housekeeping kinase functions as a metastasis suppressor"]},{"year":1997,"claim":"Showed that reducing NM23-H1 directly inhibits proliferation, providing early evidence that NME1 participates in cell cycle progression rather than acting solely as a suppressor.","evidence":"Antisense oligonucleotide and stable antisense transfection in MCF10A cells with proliferation/S-phase readout","pmids":["9335458"],"confidence":"Medium","gaps":["Antisense approaches lack target specificity controls","No molecular mechanism linking NM23-H1 to cell cycle machinery"]},{"year":1999,"claim":"Identified PRUNE as a physical partner of NM23-H1 and linked the metastasis-associated S120G mutant to loss of binding, opening the protein-interaction dimension of NME1 biology.","evidence":"Yeast two-hybrid interaction-mating, in vitro co-IP, confocal co-localization","pmids":["10602478"],"confidence":"Medium","gaps":["Functional consequence of the interaction not established here","Binding interface not defined structurally"]},{"year":2001,"claim":"Demonstrated sequence-specific DNA binding/cleavage and transcriptional repression at the PDGF-A promoter, and localization to the centrosome with gamma-tubulin, extending NME1 beyond a soluble kinase.","evidence":"Recombinant DNA cleavage assays and HepG2 reporter assays; confocal imaging, centrosome purification, and co-IP with gamma-tubulin (rat ortholog)","pmids":["11694515","11139339"],"confidence":"High","gaps":["Mechanism coupling DNA cleavage to repression unclear","Centrosomal role uses rat ortholog and lacks functional perturbation"]},{"year":2004,"claim":"Revealed an intrinsic 3'-5' exonuclease activity with a defined catalytic residue (Lys12), establishing a second enzymatic function distinct from NDPK.","evidence":"In vitro exonuclease assay with recombinant WT and K12Q mutant, co-purification, and active-site mutagenesis","pmids":["14960567"],"confidence":"High","gaps":["In vivo substrate and biological role of the exonuclease undefined here","Relationship between exonuclease and NDPK active sites unresolved"]},{"year":2007,"claim":"Connected NME1 to a defined anti-motility/anti-metastatic effector pathway by showing transcriptional repression of EDG2/LPA1 is required to suppress motility and pulmonary metastatic colonization in vivo.","evidence":"Expression microarray, motility/rescue transfection, siRNA, spontaneous metastasis xenograft, and human breast tumor cohort IHC","pmids":["17671192","18089805"],"confidence":"High","gaps":["Direct DNA-binding mechanism at the EDG2 promoter not shown","How NDPK/exonuclease activities relate to EDG2 repression unclear"]},{"year":2007,"claim":"Placed NME1 in the p53 axis by showing it binds the p53 DNA-binding domain via STRAP and potentiates p53 function by displacing Mdm2, linking metastasis suppression to tumor-suppressor signaling.","evidence":"Co-IP, domain/point-mutant mapping (NM23 Cys145, p53 Cys176), reporter assays, apoptosis/growth assays, siRNA","pmids":["17916563"],"confidence":"Medium","gaps":["Single-lab interaction without reciprocal in vivo validation","Stoichiometry of the NM23/STRAP/p53 complex undefined"]},{"year":2009,"claim":"Defined a redox switch by mapping oxidative inhibition to Cys109 and identifying TrxR1 as the reductive restoration system, explaining how enzymatic and suppressor activities are controlled by oxidative stress.","evidence":"Tandem MS oxidation-site mapping, NDPK assays, TrxR1 co-IP and reduction assay, C109A mutagenesis, metastasis suppressor assay","pmids":["19956735"],"confidence":"High","gaps":["Physiological triggers of oxidation in tumors not defined","Whether exonuclease/kinase activities share this regulation unaddressed"]},{"year":2010,"claim":"Established a genome-stability role by showing NME1 supplies local GTP to dynamin during cytokinesis, with its loss causing furrow regression and tetraploidy.","evidence":"RNAi, live-cell cytokinesis imaging, dynamin overexpression complementation, flow cytometry ploidy","pmids":["20713695"],"confidence":"High","gaps":["Spatial mechanism of GTP channeling to dynamin not visualized directly","Contribution of this function to metastasis suppression not quantified"]},{"year":2010,"claim":"Broadened the partner network and downstream effects, linking NME1 to AP-1/p53 complexes and cyclin D1 repression, and to integrin beta1 glycosylation controlling adhesion/migration.","evidence":"Co-IP, cyclin D1 promoter reporter and apoptosis assays in B cells; adhesion/migration assays and integrin glycosylation analysis in hepatocarcinoma cells","pmids":["20448457","20618991"],"confidence":"Medium","gaps":["Mechanistic basis of integrin glycosylation effect undefined","Single-lab co-IPs without reciprocal validation"]},{"year":2011,"claim":"Assigned the in vivo metastasis-suppressor requirement specifically to the 3'-5' exonuclease activity and tied NME1 to UV photoproduct repair, separating in vivo suppression from culture motility.","evidence":"E5A/K12Q mutagenesis with enzymatic and metastasis xenograft assays; NER kinetics, nuclear damage-site translocation imaging, and hemizygous-null mouse UV melanoma model","pmids":["20209495","22080566"],"confidence":"High","gaps":["Direct in vivo DNA substrate of the exonuclease not identified","How exonuclease and kinase activities cooperate during repair unresolved"]},{"year":2011,"claim":"Showed NME1 subcellular localization is actively controlled, with KSHV LANA driving nuclear translocation that is required for Ras-BRaf-MAPK activation and invasion.","evidence":"Subcellular fractionation, confocal imaging, siRNA, ectopic LANA expression, MAPK/invasion assays, demethylation agent","pmids":["21270158"],"confidence":"Medium","gaps":["Direct molecular trigger of LANA-mediated translocation undefined","Nuclear NME1 effector mediating MAPK activation unidentified"]},{"year":2012,"claim":"Defined a contact-dependent motility mechanism whereby NME1 enforces contact inhibition of locomotion by binding alpha-catenin/N-cadherin and inactivating Tiam1 to suppress Rac1; also linked NME1 to TGF-beta1/Snail-driven EMT.","evidence":"Reciprocal co-IPs, binding-mutant rescue, Rac1 activity and invasion assays; siRNA/shRNA rescue with EMT markers and Src/Snail involvement","pmids":["22718351","23137649"],"confidence":"High","gaps":["How NME1 enzymatic activity drives Tiam1 inactivation unclear","EMT regulation lacks defined direct molecular target"]},{"year":2013,"claim":"Provided structural insight into both partner binding and redox regulation, mapping the h-Prune interaction interface and resolving a Cys4-Cys145 disulfide that dissociates the active hexamer into dimers.","evidence":"NMR of h-Prune C-terminus with competitive peptide inhibitor and in vivo neuroblastoma assays; X-ray crystallography, HDX, and tandem MS of oxidized NM23-H1","pmids":["23448979","23519676"],"confidence":"Medium","gaps":["Quaternary-state dependence of each enzymatic activity not fully mapped","Whether disulfide formation occurs at physiological oxidant levels unaddressed"]},{"year":2017,"claim":"Connected NME1 to craniofacial development and defined its protein histidine kinase identity, showing IRF6 interaction (disrupted by CLP-associated R18Q with elevated Rac1/RhoA) and His118 autophosphorylation with substrate phosphorylation.","evidence":"Yeast two-hybrid, co-IP, palatal epithelial co-localization, Rho-GTPase and patient-variant assays; anti-pHis and anti-pH118 antibody immunoblotting in neuroblastoma cells/xenografts","pmids":["28767310","32392889"],"confidence":"Medium","gaps":["pHis detection relies on antibody specificity without orthogonal validation","Physiological histidine-kinase substrates largely unidentified"]},{"year":2020,"claim":"Extended NME1 function to neuronal biology, identifying it as a necessary and sufficient mediator of GDF5-promoted neurite growth.","evidence":"Proteomics, in vivo GDF5 brain overexpression, siRNA, ectopic and exogenous NME1, neurite growth assays in SH-SY5Y and primary mDA neurons","pmids":["32853992"],"confidence":"Medium","gaps":["Which enzymatic activity drives neurite growth unknown","Downstream effectors in neurons not defined"]},{"year":2023,"claim":"Identified upstream regulators of NME1 expression at the transcriptional (CTCF/EGR1) and post-transcriptional (NSUN6-mediated m5C) levels, explaining how aggressive tumors lose NME1.","evidence":"ChIP, promoter reporters and migration assays for CTCF/EGR1 (2021); m5C RIP, luciferase, and functional/xenograft assays for NSUN6 (2023)","pmids":["33436746","38029727"],"confidence":"Medium","gaps":["Relative contribution of each regulatory layer in vivo unknown","Whether these regulators act coordinately is untested"]},{"year":null,"claim":"It remains unresolved how NME1's distinct catalytic activities (NDPK, exonuclease, histidine kinase) are mechanistically integrated and selectively deployed to produce metastasis suppression, and what its in vivo histidine-kinase substrate repertoire is.","evidence":"No single study reconciling the multiple enzymatic activities with the diverse partner/effector pathways","pmids":[],"confidence":"Low","gaps":["No unified model linking enzymatic activities to specific suppressor outputs","In vivo protein-histidine-kinase substrates uncharacterized","Quaternary-structure regulation of activity selection unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,21]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[21]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[2,7]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[2]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,4,5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13,9]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,8,18]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,20]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[12]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[4,5,7]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[8]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[9,25]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[13,18]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,6]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[10,11]}],"complexes":[],"partners":["PRUNE","TP53","STRAP","CDC42","TIAM1","CTNNA1","IRF6","TXNRD1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P15531","full_name":"Nucleoside diphosphate kinase A","aliases":["Farnesyl diphosphate kinase NME1","Histidine protein kinase NME1","Metastasis inhibition factor nm23","NM23-H1","Non-specific serine/threonine protein kinase NME1","Nucleoside diphoshate kinase 1","NDK1","Putative 3'-5'-DNA exonuclease NDK1","Putative granzyme A-activated DNA endonuclease","GAAD","Tumor metastatic process-associated protein"],"length_aa":152,"mass_kda":17.1,"function":"Catalyzes the transfer of a gamma-phosphoryl group from a nucleoside triphosphate, mainly ATP, to a nucleoside diphosphate via a ping-pong mechanism involving a phosphohistidine intermediate, therefore contributing to the nucleoside triphosphate homeostasis (PubMed:10952986, PubMed:14960567, PubMed:16313181, PubMed:1851158, PubMed:23519676, PubMed:33903070, PubMed:8810265, PubMed:9038158). Also phosphorylates geranyl pyrophosphate (GPP) and farnesyl pyrophosphate (FPP), linking it to isoprenoid metabolism (PubMed:10952986). Additionally, functions as a non-specific serine/threonine kinase and histidine protein kinase, transferring phosphoryl groups from its active site to target proteins (PubMed:8529641, PubMed:9038158). May function as a Mg(2+)-dependent single-stranded DNA endonuclease as part of the SET complex, cooperating with the 3'-5' exonuclease TREX1 to mediate apoptotic DNA fragmentation in cytotoxic T lymphocytes (PubMed:12628186, PubMed:16818237). Reported to nick one DNA strand, enabling TREX1 to remove nucleotides from the free 3' end, enhancing DNA damage and suppressing DNA end reannealing and repair (PubMed:16818237). Has been shown to cleave double strands DNA within the 3'-portions of both 5'-SHS silencer and NHE basal promoter element of the PDGFA gene, potentially repressing its transcription (PubMed:11694515). May also function as a Mg(2+)-dependent 3'-5' DNA exonuclease, excising nucleotides from 3' single-stranded DNA or DNA with 3' single strand overhangs, suggesting a role in DNA nucleolytic processing (PubMed:14960567, PubMed:16313181). Involved in the regulation of tumor metastasis and cellular differentiation (By similarity). Also required for cell motility (PubMed:8270257, PubMed:25582197). May control, with NME2, AcCoA usage between histone acetylation and fatty acid synthesis, possibly by binding and releasing AcCoA at transcriptionally active chromatin regions in proximity to histone acetyltransferase (HAT) (By similarity)","subcellular_location":"Cytoplasm; Nucleus; Cell membrane","url":"https://www.uniprot.org/uniprotkb/P15531/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NME1","classification":"Not Classified","n_dependent_lines":16,"n_total_lines":1208,"dependency_fraction":0.013245033112582781},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NME1","total_profiled":1310},"omim":[{"mim_id":"617413","title":"PRUNE EXOPOLYPHOSPHATASE 1; PRUNE1","url":"https://www.omim.org/entry/617413"},{"mim_id":"609097","title":"F-BOX ONLY PROTEIN 24; FBXO24","url":"https://www.omim.org/entry/609097"},{"mim_id":"608294","title":"NME/NM23 NUCLEOSIDE DIPHOSPHATE KINASE 6; NME6","url":"https://www.omim.org/entry/608294"},{"mim_id":"606609","title":"3-PRIME @REPAIR EXONUCLEASE 1; TREX1","url":"https://www.omim.org/entry/606609"},{"mim_id":"603846","title":"NADH-UBIQUINONE OXIDOREDUCTASE Fe-S PROTEIN 3; NDUFS3","url":"https://www.omim.org/entry/603846"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NME1"},"hgnc":{"alias_symbol":["NM23","NM23-H1","NDPKA"],"prev_symbol":[]},"alphafold":{"accession":"P15531","domains":[{"cath_id":"3.30.70.141","chopping":"5-149","consensus_level":"high","plddt":98.107,"start":5,"end":149}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P15531","model_url":"https://alphafold.ebi.ac.uk/files/AF-P15531-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P15531-F1-predicted_aligned_error_v6.png","plddt_mean":97.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NME1","jax_strain_url":"https://www.jax.org/strain/search?query=NME1"},"sequence":{"accession":"P15531","fasta_url":"https://rest.uniprot.org/uniprotkb/P15531.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P15531/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P15531"}},"corpus_meta":[{"pmid":"1988104","id":"PMC_1988104","title":"Identification of a second 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the nm23 homologues nm23-H4, nm23-H6, and nm23-H7 in human gastric and colon cancer.","date":"2005","source":"The Journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/15726650","citation_count":25,"is_preprint":false},{"pmid":"28991262","id":"PMC_28991262","title":"NDPKA is not just a metastasis suppressor - be aware of its metastasis-promoting role in neuroblastoma.","date":"2017","source":"Laboratory investigation; a journal of technical methods and pathology","url":"https://pubmed.ncbi.nlm.nih.gov/28991262","citation_count":24,"is_preprint":false},{"pmid":"21553004","id":"PMC_21553004","title":"Correlation of NM23-H1 cytoplasmic expression with metastatic stage in human prostate cancer tissue.","date":"2011","source":"Naunyn-Schmiedeberg's archives of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/21553004","citation_count":24,"is_preprint":false},{"pmid":"22718351","id":"PMC_22718351","title":"Nm23-H1 regulates contact inhibition of locomotion, which is affected by 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and migration on fibronectin by modulating glycosylation of integrin beta1.","date":"2010","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/20618991","citation_count":22,"is_preprint":false},{"pmid":"8679442","id":"PMC_8679442","title":"Expression of NM23 in human melanoma progression and metastasis.","date":"1996","source":"British journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/8679442","citation_count":22,"is_preprint":false},{"pmid":"15761980","id":"PMC_15761980","title":"Expression and significance of heparanase and nm23-H1 in hepatocellular carcinoma.","date":"2005","source":"World journal of gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/15761980","citation_count":21,"is_preprint":false},{"pmid":"16944304","id":"PMC_16944304","title":"Nm23/NDP kinases in hepatocellular carcinoma.","date":"2006","source":"Journal of bioenergetics and biomembranes","url":"https://pubmed.ncbi.nlm.nih.gov/16944304","citation_count":21,"is_preprint":false},{"pmid":"28767310","id":"PMC_28767310","title":"Disrupted IRF6-NME1/2 Complexes as a Cause of Cleft Lip/Palate.","date":"2017","source":"Journal of dental research","url":"https://pubmed.ncbi.nlm.nih.gov/28767310","citation_count":21,"is_preprint":false},{"pmid":"19302816","id":"PMC_19302816","title":"Nm23-H1 regulates the proliferation and differentiation of the human chronic myeloid leukemia K562 cell line: a functional proteomics study.","date":"2009","source":"Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/19302816","citation_count":21,"is_preprint":false},{"pmid":"21846466","id":"PMC_21846466","title":"Functional modulation of the metastatic suppressor Nm23-H1 by oncogenic viruses.","date":"2011","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/21846466","citation_count":20,"is_preprint":false},{"pmid":"24829611","id":"PMC_24829611","title":"The metastasis suppressor Nm23 as a modulator of Ras/ERK signaling.","date":"2014","source":"Journal of molecular signaling","url":"https://pubmed.ncbi.nlm.nih.gov/24829611","citation_count":20,"is_preprint":false},{"pmid":"21584562","id":"PMC_21584562","title":"Human nm23-h1-protein and h2-protein have similar nucleoside diphosphate kinase-activities.","date":"1992","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/21584562","citation_count":20,"is_preprint":false},{"pmid":"16475705","id":"PMC_16475705","title":"Expression of Nm23 in gliomas and its effect on migration and invasion in vitro.","date":"2006","source":"Anticancer research","url":"https://pubmed.ncbi.nlm.nih.gov/16475705","citation_count":19,"is_preprint":false},{"pmid":"19377884","id":"PMC_19377884","title":"Regulators affecting the metastasis suppressor activity of Nm23-H1.","date":"2009","source":"Molecular and cellular 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cancer","url":"https://pubmed.ncbi.nlm.nih.gov/19171060","citation_count":18,"is_preprint":false},{"pmid":"8738406","id":"PMC_8738406","title":"Increased levels of nm23 H1/nucleoside diphosphate kinase A mRNA associated with adenocarcinoma of the prostate.","date":"1996","source":"World journal of urology","url":"https://pubmed.ncbi.nlm.nih.gov/8738406","citation_count":17,"is_preprint":false},{"pmid":"21912348","id":"PMC_21912348","title":"Melanoma-associated genes, MXI1, FN1, and NME1, are hypoxia responsive in murine and human melanoma cells.","date":"2011","source":"Melanoma research","url":"https://pubmed.ncbi.nlm.nih.gov/21912348","citation_count":16,"is_preprint":false},{"pmid":"18647967","id":"PMC_18647967","title":"A clinicopathological study of nm23-H1 expression in classical Hodgkin's lymphoma.","date":"2008","source":"Annals of oncology : official journal of the European Society for Medical 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expression of mouse nm23-M1 gene. Comparison with nm23-M2 expression.","date":"1999","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/10452942","citation_count":15,"is_preprint":false},{"pmid":"29050254","id":"PMC_29050254","title":"RGS19 upregulates Nm23-H1/2 metastasis suppressors by transcriptional activation via the cAMP/PKA/CREB pathway.","date":"2017","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/29050254","citation_count":15,"is_preprint":false},{"pmid":"9858935","id":"PMC_9858935","title":"The p53 and nm23-H1 genes are not deleted in oral benign epithelial lesions.","date":"1998","source":"Anticancer research","url":"https://pubmed.ncbi.nlm.nih.gov/9858935","citation_count":15,"is_preprint":false},{"pmid":"32853992","id":"PMC_32853992","title":"STRAP and NME1 Mediate the Neurite Growth-Promoting Effects of the Neurotrophic Factor GDF5.","date":"2020","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/32853992","citation_count":14,"is_preprint":false},{"pmid":"11819333","id":"PMC_11819333","title":"Relationship between expression of CD44v6 and nm23-H1 and tumor invasion and metastasis in hepatocellular carcinoma.","date":"1998","source":"World journal of gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/11819333","citation_count":14,"is_preprint":false},{"pmid":"18330957","id":"PMC_18330957","title":"Changes of histology and expression of MMP-2 and nm23-H1 in primary and metastatic gastric cancer.","date":"2008","source":"World journal of gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/18330957","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48504,"output_tokens":7127,"usd":0.126209,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16120,"output_tokens":6013,"usd":0.115462,"stage2_stop_reason":"end_turn"},"total_usd":0.241671,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1992,\n      \"finding\": \"NM23-H1 (nm23-H1) and NM23-H2 proteins both exhibit nucleoside diphosphate kinase (NDPK) enzymatic activity, catalyzing phosphotransfer from ATP to nucleoside diphosphates (e.g., GDP→GTP) via a phosphoenzyme intermediate; recombinant GST-fusion proteins expressed in E. coli formed [32P]-phosphoenzyme intermediates and converted GDP to GTP as shown by TLC.\",\n      \"method\": \"In vitro enzymatic assay with recombinant GST-fusion proteins; [γ-32P]ATP phosphoenzyme intermediate formation; TLC detection of GTP synthesis\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro reconstitution of enzymatic activity with purified recombinant protein, replicated across both H1 and H2 isoforms\",\n      \"pmids\": [\"21584562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NM23-H1 binds to and cleaves the C-rich strand of the PDGF-A promoter nuclease-hypersensitive element (5'-SHS) at distinct 3'-sites relative to NM23-H2, and both proteins repress PDGF-A promoter-driven transcription in HepG2 cells, revealing a DNA-binding/cleavage-dependent transcriptional repression mechanism.\",\n      \"method\": \"Screening of HeLa cDNA expression library with PDGF-A silencer C-rich strand; recombinant protein DNA cleavage assays; transient transfection reporter assays in HepG2 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro DNA cleavage assay with recombinant protein plus functional transcription reporter assay; single lab but two orthogonal methods\",\n      \"pmids\": [\"11694515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NM23-H1 possesses intrinsic 3'-5' exonuclease activity that excises single nucleotides stepwise from DNA 3' termini in a Mg2+-dependent manner, preferring single-stranded substrates or mismatched 3' ends; Lys12 is critical for catalysis, as K12Q substitution greatly diminishes activity.\",\n      \"method\": \"In vitro exonuclease assay with recombinant wild-type and K12Q mutant NM23-H1; hydroxylapatite and gel filtration HPLC co-purification; inhibition by ATP and cordycepin incorporation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of novel enzymatic activity with purified recombinant protein plus active-site mutagenesis, single lab\",\n      \"pmids\": [\"14960567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human PRUNE protein physically interacts with NM23-H1 (the human homolog of Drosophila awd), as demonstrated by yeast two-hybrid interaction-mating and in vitro co-immunoprecipitation; the NM23-H1 S120G gain-of-function mutant loses this interaction. PRUNE and NM23-H1 partially co-localize in the cytoplasm.\",\n      \"method\": \"Yeast two-hybrid interaction-mating; in vitro co-immunoprecipitation; confocal co-localization\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal yeast 2-hybrid plus co-IP plus co-localization, single lab, three methods converging on same conclusion\",\n      \"pmids\": [\"10602478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NM23-H1 suppresses tumor cell motility at least in part by transcriptionally down-regulating the lysophosphatidic acid receptor EDG2 (LPA1); mutants P96S and S120G fail to down-regulate EDG2 and fail to suppress motility; EDG2 overexpression in NM23-H1-expressing cells restores motility 60-fold.\",\n      \"method\": \"Expression microarray of MDA-MB-435 cells overexpressing wild-type vs. mutant NM23-H1; transfection/in vitro motility (Boyden chamber) assays; EDG2 siRNA knockdown\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — microarray plus functional rescue transfection plus siRNA knockdown, independently confirmed in a companion in vivo study (PMID:18089805)\",\n      \"pmids\": [\"17671192\", \"18089805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NM23-H1 transcriptional down-regulation of EDG2/LPA1 is functionally critical for metastasis suppression in vivo: EDG2 co-expression with NM23-H1 restored cell lung retention 8–13-fold and restored pulmonary metastasis incidence from 51.9% to 90.4% in spontaneous metastasis assay. Human breast carcinoma cohort showed a statistically significant inverse correlation (r=−0.73) between NM23-H1 and EDG2 protein levels.\",\n      \"method\": \"Fluorescent cell tracking/ex vivo microscopy for lung retention; spontaneous metastasis xenograft assay; in vitro motility/invasion assays; human tumor cohort immunohistochemistry\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal in vitro and in vivo methods, human tissue validation, single lab but comprehensive study\",\n      \"pmids\": [\"18089805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NM23-H1 and its binding partner STRAP directly bind to p53's central DNA-binding domain (residues 113–290) via NM23-H1 Cys145 and p53 Cys176; this complex potentiates p53-mediated transcription, apoptosis, and growth inhibition, and works by displacing Mdm2 from the p53–Mdm2 complex.\",\n      \"method\": \"Co-immunoprecipitation; domain-mapping with deletion/point mutants; luciferase reporter transcription assays; apoptosis and growth inhibition assays; siRNA knockdown of NM23-H1/STRAP\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP plus mutagenesis plus functional reporter assays, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"17916563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The 3'-5' exonuclease activity of NM23-H1 is necessary for its metastasis suppressor function in vivo: exonuclease-deficient mutants E5A and K12Q failed to suppress spontaneous lung metastasis of 1205LU melanoma cells in mice, while retaining the ability to suppress motility/invasion in culture, indicating the exonuclease contributes specifically to in vivo metastasis suppression.\",\n      \"method\": \"Site-directed mutagenesis; in vitro exonuclease and NDPK assays; stable transfection of melanoma cell lines; spontaneous lung metastasis xenograft assay; in vitro Boyden chamber motility/invasion assays\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro enzymatic characterization of mutants plus in vivo metastasis assay, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"20209495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NM23-H1 promotes repair of UV-induced (6-4) photoproduct DNA damage; NM23-H1 deficiency compromised nucleotide excision repair kinetics; NM23-H1 rapidly translocated to sites of UV-induced DNA damage in the nucleus; its kinase activity was critical for rapid repair and 3'-5' exonuclease activity dominant in suppression of UV-induced mutagenesis. Nm23-M1/M2 hemizygous-null transgenic mice developed UV-induced melanoma.\",\n      \"method\": \"DNA repair kinetics assay (total polymerase-blocking lesions; (6-4) photoproduct NER); nuclear translocation imaging; transgenic knockout mouse UV-induced melanoma model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (DNA repair assay, live-cell imaging, in vivo transgenic model) in a single study with rigorous controls\",\n      \"pmids\": [\"22080566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NM23-H1 provides a local source of GTP for the GTPase dynamin during cytokinesis; loss of NM23-H1 in diploid cells causes cytokinetic furrow regression and cytokinesis failure generating tetraploid cells; dynamin loss phenocopies NM23-H1 loss; ectopic overexpression of dynamin complements NM23-H1 loss.\",\n      \"method\": \"RNAi knockdown; live-cell imaging of cytokinesis; ectopic dynamin overexpression rescue; flow cytometry for ploidy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (complementation) plus live imaging plus RNAi phenotype, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"20713695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NM23-H1 NDPK enzymatic activity is regulated by oxidative modification of Cys109: H2O2-induced oxidation (intra/inter-disulfide, glutathionylation, sulfonic acid) inhibits NDPK activity and metastasis suppressor activity; thioredoxin reductase 1 (TrxR1) interacts specifically with oxidized NM23-H1 and restores NDPK activity via the NADPH-TrxR1-thioredoxin shuttle. C109A mutant retains both activities under oxidative stress.\",\n      \"method\": \"UPLC-ESI-q-TOF tandem MS for oxidation-site identification; in vitro NDPK activity assay; co-immunoprecipitation of TrxR1; in vitro TrxR1 reduction assay; site-directed mutagenesis (C109A); metastasis suppressor activity assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mass spectrometry identification of modification sites plus enzymatic assays plus mutagenesis plus co-IP, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"19956735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Oxidative conditions cause an intramolecular disulfide bond between Cys4 and Cys145 in NM23-H1, triggering a large conformational change that dissociates the functional hexamer into dimers; this structural change facilitates further oxidation of Cys109 to sulfonic acid. Crystal structure of oxidized NM23-H1 was determined.\",\n      \"method\": \"X-ray crystallography; hydrogen/deuterium-exchange experiments; nanoUPLC-ESI-q-TOF tandem MS peptide sequencing\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure determination plus HDX and MS validation, single lab but rigorous structural/biophysical study\",\n      \"pmids\": [\"23519676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NM23-H1 (rat homolog Nm23-R1/NDPKbeta) localizes to the centrosome in dividing and non-dividing cells, is catalytically active there, and co-immunoprecipitates with γ-tubulin, a core centrosomal protein essential for microtubule nucleation.\",\n      \"method\": \"Confocal laser scanning microscopy; biochemical centrosome purification; co-immunoprecipitation with γ-tubulin\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — subcellular fractionation/purification plus co-IP plus imaging, single lab; ortholog study (rat/human)\",\n      \"pmids\": [\"11139339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NM23-H1 is essential for contact inhibition of locomotion (CIL) by suppressing Rac1 through inactivation of Tiam1 at cell-cell contact sites; NM23-H1 translocates to contact sites via association with α-catenin and N-cadherin; ephrin-B1 disrupts CIL by inhibiting NM23-H1 association with Tiam1, activating Rac1.\",\n      \"method\": \"Spheroid confrontation invasion assay; siRNA knockdown; transfection of NM23-H1 binding mutants; co-immunoprecipitation of NM23-H1 with α-catenin, N-cadherin, and Tiam1; Rac1 activity assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IPs plus functional mutant rescue plus invasion assay, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"22718351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NM23-H1 overexpression suppresses hepatocarcinoma cell adhesion and migration on fibronectin by impairing glycosylation of integrin β1, reducing mature β1 integrin on the cell surface (while mRNA levels are unchanged) and attenuating FAK phosphorylation.\",\n      \"method\": \"Stable transfection of NM23-H1; adhesion and wound-healing migration assays on fibronectin; flow cytometry for surface integrin; Western blot for mature vs. precursor integrin β1 isoforms; tunicamycin deglycosylation control\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional cell assays plus biochemical glycosylation analysis, single lab, multiple convergent methods\",\n      \"pmids\": [\"20618991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NM23-H1 negatively regulates TGF-β1-induced epithelial-mesenchymal transition (EMT) in lung cancer cells; NM23-H1 knockdown enhanced TGF-β1-induced loss of E-cadherin and upregulation of β-catenin and fibronectin; this effect was Snail-dependent and involved Src kinase; ectopic re-expression of shRNA-resistant NM23-H1 reversed the knockdown phenotype.\",\n      \"method\": \"siRNA/shRNA knockdown; ectopic NM23-H1 re-expression rescue; Western blot for EMT markers; invasion/migration assays; Snail and Src kinase involvement assessed\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — siRNA/rescue experiment with multiple EMT markers, single lab, moderate mechanistic resolution\",\n      \"pmids\": [\"23137649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NM23-H1 forms a complex with transcription factor AP-1 and with p53 in B cells; NM23-H1 expression down-regulates cyclin D1 promoter activity in a dose-responsive manner, inducing cell cycle arrest and apoptosis (upregulating caspase 3/9, Bcl-x, p53; reducing cyclin D1).\",\n      \"method\": \"Microarray pathway analysis; real-time PCR validation; promoter-reporter (cyclin D1) assay; co-immunoprecipitation of NM23-H1 with AP-1 and p53; proliferation and apoptosis assays\",\n      \"journal\": \"Cancer biology & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP plus promoter assay plus multiple functional readouts, single lab\",\n      \"pmids\": [\"20448457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NM23-H1 interacts with Cdc42 (endogenous proteins), as validated by reciprocal co-immunoprecipitation in K562 leukemia cells; NM23-H1 knockdown reduced Cdc42 protein expression and impaired megakaryocytic differentiation.\",\n      \"method\": \"Reciprocal co-immunoprecipitation; functional proteomics (2D-DIGE/MS); flow cytometry (CD41); ploidy analysis\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal co-IP validated plus functional proteomics, single lab\",\n      \"pmids\": [\"19302816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"KSHV-encoded LANA promotes nuclear translocation of NM23-H1; nuclear NM23-H1 is required for Ras-BRaf-MAPK pathway activation and cell invasiveness induced by KSHV; cytoplasmic overexpression of NM23-H1 (via DNA demethylation agent) reduced KSHV-associated MAPK activation and invasiveness.\",\n      \"method\": \"Subcellular fractionation; confocal imaging; siRNA knockdown; ectopic LANA expression; MAPK pathway activation assays; invasion assays; pharmacologic DNA methylation inhibitor\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — subcellular localization experiments with functional consequence, multiple complementary approaches, single lab\",\n      \"pmids\": [\"21270158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NM23-H1/h-Prune complex formation identified by NMR spectroscopy of h-Prune C-terminal domain; a competitive permeable peptide (CPP) disrupting the Nm23-H1/h-Prune complex impaired cell motility, tumor growth, and metastasis formation in neuroblastoma models.\",\n      \"method\": \"NMR spectroscopy conformational analysis; competitive peptide inhibitor (CPP) design; cell motility assays; in vivo xenograft tumor growth and metastasis assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — NMR structural analysis of binding interface plus functional in vivo validation, single lab\",\n      \"pmids\": [\"23448979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NME1 (NM23-H1) physically interacts with IRF6 in the cytoplasm of palatal epithelial cells; this interaction is enhanced by phosphorylation of key serine residues in the IRF6 C-terminus. CLP-associated NME1 missense mutation R18Q disrupts IRF6 binding and leads to elevated Rac1 and RhoA activation.\",\n      \"method\": \"Yeast two-hybrid screen; co-immunoprecipitation; in vivo co-localization in primary palatal epithelial cells; Rac1/RhoA activation assays; patient variant functional testing\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — yeast 2-hybrid plus co-IP plus in vivo co-localization plus functional Rho assays, single lab\",\n      \"pmids\": [\"28767310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NME1 (NM23-H1) and NME2 act as protein histidine kinases that phosphorylate histidine residues on themselves (via His118 phosphohistidine intermediate) and on substrate proteins; anti-pHis antibodies detected pH118-NME1/2 and multiple pHis-containing proteins in neuroblastoma cell lines and xenograft tumors.\",\n      \"method\": \"Anti-1- and 3-pHis monoclonal antibodies; anti-pH118 NME1/2 polyclonal antibodies; immunoblotting of neuroblastoma cell lines and xenograft tumor lysates\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — antibody-based detection of phosphohistidine in cells, single lab; method relies on specificity of novel antibodies without additional orthogonal validation in this paper\",\n      \"pmids\": [\"32392889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GDF5 neurotrophic factor increases NME1 expression in SH-SY5Y neuronal cells and in adult rat brain in vivo; NME1 expression is necessary and sufficient for GDF5-promoted neurite growth; exogenous NME1 protein treatment increased neurite growth in SH-SY5Y cells and in cultured midbrain dopaminergic neurons.\",\n      \"method\": \"Proteomics analysis; in vivo GDF5 overexpression in rat brain; siRNA knockdown; ectopic expression; quantitative neurite growth assays in SH-SY5Y and primary mDA neurons\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — proteomics plus in vitro/in vivo functional assays with knockdown and overexpression, single lab\",\n      \"pmids\": [\"32853992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NSUN6 methyltransferase regulates NM23-H1 mRNA expression by depositing m5C modification on the 3'-UTR of NM23-H1 mRNA, stabilizing/promoting its expression; NSUN6 overexpression restricts lung cancer cell proliferation, migration, and EMT via elevated NM23-H1.\",\n      \"method\": \"m5C RIP (methylated RNA immunoprecipitation); dot blot; luciferase assay; qRT-PCR/Western blot; functional cell assays (CCK-8, wound-healing, transwell); in vivo xenograft\",\n      \"journal\": \"Medical principles and practice\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — m5C RIP plus luciferase reporter plus functional assays, single lab, multiple convergent methods\",\n      \"pmids\": [\"38029727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Transcription factors CTCF and EGR1 bind the proximal NM23-H1 promoter and induce NM23-H1 expression, thereby reducing MDA-MB-231 breast cancer cell migration; loss of CTCF and EGR1 in aggressive breast cancer cells correlates with reduced NM23-H1 levels.\",\n      \"method\": \"Promoter truncation/luciferase reporter analysis; ChIP (chromatin immunoprecipitation) of CTCF and EGR1 at NM23-H1 promoter; ectopic CTCF/EGR1 expression; wound-healing migration assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ChIP plus promoter reporter plus functional migration assay, single lab\",\n      \"pmids\": [\"33436746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"NM23-H1 down-regulation by antisense oligonucleotides or stable antisense-transfection in MCF10A cells directly inhibits cell proliferation, demonstrating a role for NM23-H1 in cell cycle progression.\",\n      \"method\": \"Antisense oligonucleotide treatment; stable antisense transfection; cell proliferation assay; cell cycle synchronization and S-phase analysis\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — antisense loss-of-function with proliferation readout, single lab, two complementary antisense strategies\",\n      \"pmids\": [\"9335458\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NME1/NM23-H1 is a multifunctional metastasis suppressor that: (1) catalyzes nucleoside diphosphate phosphorylation (NDPK activity) via a phosphohistidine intermediate; (2) possesses 3'-5' exonuclease activity (requiring Lys12, Glu5) that is necessary for in vivo metastasis suppression and DNA repair after UV damage; (3) acts as a protein histidine kinase (autophosphorylating His118) that phosphorylates substrates such as KSR to suppress Ras/MAPK signaling; (4) transcriptionally represses the LPA receptor EDG2/LPA1 to suppress cell motility and metastatic colonization; (5) suppresses Rac1 activity through Tiam1 inactivation at cell-cell contacts to enforce contact inhibition of locomotion; (6) provides local GTP to dynamin during cytokinesis to prevent furrow regression and chromosomal instability; (7) localizes to centrosomes where it co-immunoprecipitates with γ-tubulin; (8) interacts with PRUNE/h-Prune, p53 (via STRAP), AP-1, Cdc42, α-catenin/N-cadherin, and IRF6; and (9) has its enzymatic activities regulated by oxidation of Cys109 (inhibitory) and intramolecular Cys4–Cys145 disulfide formation (hexamer destabilization), with restoration by the TrxR1/thioredoxin system.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NME1/NM23-H1 is a multifunctional metastasis suppressor whose anti-metastatic activity integrates several biochemically distinct enzymatic functions with control of cell motility and genome stability [#7, #4]. Its founding biochemistry is nucleoside diphosphate kinase (NDPK) activity, transferring phosphate from ATP to nucleoside diphosphates via a phosphoenzyme intermediate [#0], and during cytokinesis this provides a local GTP source for the GTPase dynamin, so that loss of NME1 causes furrow regression, cytokinesis failure, and tetraploidy [#9]. NME1 additionally possesses an intrinsic Mg2+-dependent 3'-5' exonuclease activity dependent on Lys12 that excises nucleotides from DNA 3' termini [#2]; this exonuclease, together with its kinase activity, supports repair of UV-induced (6-4) photoproducts and is specifically required for metastasis suppression in vivo, as exonuclease-dead E5A/K12Q mutants fail to suppress lung metastasis while retaining anti-motility activity in culture [#7, #8]. NME1 also acts in the nucleus, binding and cleaving the C-rich strand of the PDGF-A promoter to repress transcription [#1] and transcriptionally down-regulating the lysophosphatidic acid receptor EDG2/LPA1, an event functionally critical for suppressing motility and pulmonary metastatic colonization [#4, #5]. At cell-cell contacts NME1 enforces contact inhibition of locomotion by associating with alpha-catenin and N-cadherin and inactivating Tiam1 to suppress Rac1 [#13]. It engages multiple partners including PRUNE/h-Prune [#3, #19], the p53 DNA-binding domain via STRAP to potentiate p53 activity by displacing Mdm2 [#6], Cdc42 [#17], and IRF6, where the cleft/lip-palate-associated R18Q mutation disrupts IRF6 binding and elevates Rac1/RhoA [#20]. Its enzymatic activities are redox-regulated: oxidation of Cys109 inhibits NDPK and metastasis-suppressor function with restoration by the TrxR1/thioredoxin system [#10], while a Cys4-Cys145 intramolecular disulfide drives a conformational change dissociating the active hexamer into dimers [#11]. NME1 functions as a protein histidine kinase that autophosphorylates His118 and phosphorylates substrate proteins [#21].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established the core biochemical identity of NM23-H1 as a nucleoside diphosphate kinase, defining the enzymatic activity that frames all later mechanistic work.\",\n      \"evidence\": \"In vitro phosphoenzyme intermediate formation and TLC detection of GDP-to-GTP conversion with recombinant GST-fusion proteins\",\n      \"pmids\": [\"21584562\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not connect NDPK activity to any cellular phenotype\", \"Does not explain how a housekeeping kinase functions as a metastasis suppressor\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Showed that reducing NM23-H1 directly inhibits proliferation, providing early evidence that NME1 participates in cell cycle progression rather than acting solely as a suppressor.\",\n      \"evidence\": \"Antisense oligonucleotide and stable antisense transfection in MCF10A cells with proliferation/S-phase readout\",\n      \"pmids\": [\"9335458\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Antisense approaches lack target specificity controls\", \"No molecular mechanism linking NM23-H1 to cell cycle machinery\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identified PRUNE as a physical partner of NM23-H1 and linked the metastasis-associated S120G mutant to loss of binding, opening the protein-interaction dimension of NME1 biology.\",\n      \"evidence\": \"Yeast two-hybrid interaction-mating, in vitro co-IP, confocal co-localization\",\n      \"pmids\": [\"10602478\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of the interaction not established here\", \"Binding interface not defined structurally\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrated sequence-specific DNA binding/cleavage and transcriptional repression at the PDGF-A promoter, and localization to the centrosome with gamma-tubulin, extending NME1 beyond a soluble kinase.\",\n      \"evidence\": \"Recombinant DNA cleavage assays and HepG2 reporter assays; confocal imaging, centrosome purification, and co-IP with gamma-tubulin (rat ortholog)\",\n      \"pmids\": [\"11694515\", \"11139339\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling DNA cleavage to repression unclear\", \"Centrosomal role uses rat ortholog and lacks functional perturbation\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Revealed an intrinsic 3'-5' exonuclease activity with a defined catalytic residue (Lys12), establishing a second enzymatic function distinct from NDPK.\",\n      \"evidence\": \"In vitro exonuclease assay with recombinant WT and K12Q mutant, co-purification, and active-site mutagenesis\",\n      \"pmids\": [\"14960567\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo substrate and biological role of the exonuclease undefined here\", \"Relationship between exonuclease and NDPK active sites unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Connected NME1 to a defined anti-motility/anti-metastatic effector pathway by showing transcriptional repression of EDG2/LPA1 is required to suppress motility and pulmonary metastatic colonization in vivo.\",\n      \"evidence\": \"Expression microarray, motility/rescue transfection, siRNA, spontaneous metastasis xenograft, and human breast tumor cohort IHC\",\n      \"pmids\": [\"17671192\", \"18089805\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct DNA-binding mechanism at the EDG2 promoter not shown\", \"How NDPK/exonuclease activities relate to EDG2 repression unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Placed NME1 in the p53 axis by showing it binds the p53 DNA-binding domain via STRAP and potentiates p53 function by displacing Mdm2, linking metastasis suppression to tumor-suppressor signaling.\",\n      \"evidence\": \"Co-IP, domain/point-mutant mapping (NM23 Cys145, p53 Cys176), reporter assays, apoptosis/growth assays, siRNA\",\n      \"pmids\": [\"17916563\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab interaction without reciprocal in vivo validation\", \"Stoichiometry of the NM23/STRAP/p53 complex undefined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined a redox switch by mapping oxidative inhibition to Cys109 and identifying TrxR1 as the reductive restoration system, explaining how enzymatic and suppressor activities are controlled by oxidative stress.\",\n      \"evidence\": \"Tandem MS oxidation-site mapping, NDPK assays, TrxR1 co-IP and reduction assay, C109A mutagenesis, metastasis suppressor assay\",\n      \"pmids\": [\"19956735\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological triggers of oxidation in tumors not defined\", \"Whether exonuclease/kinase activities share this regulation unaddressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established a genome-stability role by showing NME1 supplies local GTP to dynamin during cytokinesis, with its loss causing furrow regression and tetraploidy.\",\n      \"evidence\": \"RNAi, live-cell cytokinesis imaging, dynamin overexpression complementation, flow cytometry ploidy\",\n      \"pmids\": [\"20713695\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial mechanism of GTP channeling to dynamin not visualized directly\", \"Contribution of this function to metastasis suppression not quantified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Broadened the partner network and downstream effects, linking NME1 to AP-1/p53 complexes and cyclin D1 repression, and to integrin beta1 glycosylation controlling adhesion/migration.\",\n      \"evidence\": \"Co-IP, cyclin D1 promoter reporter and apoptosis assays in B cells; adhesion/migration assays and integrin glycosylation analysis in hepatocarcinoma cells\",\n      \"pmids\": [\"20448457\", \"20618991\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic basis of integrin glycosylation effect undefined\", \"Single-lab co-IPs without reciprocal validation\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Assigned the in vivo metastasis-suppressor requirement specifically to the 3'-5' exonuclease activity and tied NME1 to UV photoproduct repair, separating in vivo suppression from culture motility.\",\n      \"evidence\": \"E5A/K12Q mutagenesis with enzymatic and metastasis xenograft assays; NER kinetics, nuclear damage-site translocation imaging, and hemizygous-null mouse UV melanoma model\",\n      \"pmids\": [\"20209495\", \"22080566\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct in vivo DNA substrate of the exonuclease not identified\", \"How exonuclease and kinase activities cooperate during repair unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed NME1 subcellular localization is actively controlled, with KSHV LANA driving nuclear translocation that is required for Ras-BRaf-MAPK activation and invasion.\",\n      \"evidence\": \"Subcellular fractionation, confocal imaging, siRNA, ectopic LANA expression, MAPK/invasion assays, demethylation agent\",\n      \"pmids\": [\"21270158\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular trigger of LANA-mediated translocation undefined\", \"Nuclear NME1 effector mediating MAPK activation unidentified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined a contact-dependent motility mechanism whereby NME1 enforces contact inhibition of locomotion by binding alpha-catenin/N-cadherin and inactivating Tiam1 to suppress Rac1; also linked NME1 to TGF-beta1/Snail-driven EMT.\",\n      \"evidence\": \"Reciprocal co-IPs, binding-mutant rescue, Rac1 activity and invasion assays; siRNA/shRNA rescue with EMT markers and Src/Snail involvement\",\n      \"pmids\": [\"22718351\", \"23137649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NME1 enzymatic activity drives Tiam1 inactivation unclear\", \"EMT regulation lacks defined direct molecular target\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided structural insight into both partner binding and redox regulation, mapping the h-Prune interaction interface and resolving a Cys4-Cys145 disulfide that dissociates the active hexamer into dimers.\",\n      \"evidence\": \"NMR of h-Prune C-terminus with competitive peptide inhibitor and in vivo neuroblastoma assays; X-ray crystallography, HDX, and tandem MS of oxidized NM23-H1\",\n      \"pmids\": [\"23448979\", \"23519676\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quaternary-state dependence of each enzymatic activity not fully mapped\", \"Whether disulfide formation occurs at physiological oxidant levels unaddressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected NME1 to craniofacial development and defined its protein histidine kinase identity, showing IRF6 interaction (disrupted by CLP-associated R18Q with elevated Rac1/RhoA) and His118 autophosphorylation with substrate phosphorylation.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, palatal epithelial co-localization, Rho-GTPase and patient-variant assays; anti-pHis and anti-pH118 antibody immunoblotting in neuroblastoma cells/xenografts\",\n      \"pmids\": [\"28767310\", \"32392889\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"pHis detection relies on antibody specificity without orthogonal validation\", \"Physiological histidine-kinase substrates largely unidentified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended NME1 function to neuronal biology, identifying it as a necessary and sufficient mediator of GDF5-promoted neurite growth.\",\n      \"evidence\": \"Proteomics, in vivo GDF5 brain overexpression, siRNA, ectopic and exogenous NME1, neurite growth assays in SH-SY5Y and primary mDA neurons\",\n      \"pmids\": [\"32853992\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which enzymatic activity drives neurite growth unknown\", \"Downstream effectors in neurons not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified upstream regulators of NME1 expression at the transcriptional (CTCF/EGR1) and post-transcriptional (NSUN6-mediated m5C) levels, explaining how aggressive tumors lose NME1.\",\n      \"evidence\": \"ChIP, promoter reporters and migration assays for CTCF/EGR1 (2021); m5C RIP, luciferase, and functional/xenograft assays for NSUN6 (2023)\",\n      \"pmids\": [\"33436746\", \"38029727\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of each regulatory layer in vivo unknown\", \"Whether these regulators act coordinately is untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how NME1's distinct catalytic activities (NDPK, exonuclease, histidine kinase) are mechanistically integrated and selectively deployed to produce metastasis suppression, and what its in vivo histidine-kinase substrate repertoire is.\",\n      \"evidence\": \"No single study reconciling the multiple enzymatic activities with the diverse partner/effector pathways\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model linking enzymatic activities to specific suppressor outputs\", \"In vivo protein-histidine-kinase substrates uncharacterized\", \"Quaternary-structure regulation of activity selection unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 21]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 4, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 8, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 20]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [4, 5, 7]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [9, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [13, 18]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [10, 11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PRUNE\", \"TP53\", \"STRAP\", \"CDC42\", \"TIAM1\", \"CTNNA1\", \"IRF6\", \"TXNRD1\"],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}