{"gene":"NSMCE3","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2005,"finding":"NSE3 (Nse3) is a subunit of the Smc5-6 complex and forms a subcomplex with Nse1 and Nse4 (Nse1-Nse3-Rad62 in S. pombe). The Nse2 SUMO ligase sumoylates Nse3 in vitro in an Nse2-dependent manner.","method":"Biochemical purification of Smc5-6 complex from S. pombe; in vitro sumoylation assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro sumoylation assay with mutagenesis controls, replicated across two companion papers (PMID:15601841, PMID:15601840)","pmids":["15601841","15601840"],"is_preprint":false},{"year":2004,"finding":"NSE3 (Nse3) is an essential nuclear protein required for normal mitotic chromosome segregation, DNA damage resistance, and meiosis. Epistasis with Rhp51 (Rad51) places Nse3 in the homologous recombination repair pathway.","method":"Genetic screen, biochemical co-purification, epistasis analysis with rhp51 mutants, sensitivity assays to genotoxic agents","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis plus biochemical isolation, replicated in companion papers across multiple labs","pmids":["15331764"],"is_preprint":false},{"year":2005,"finding":"NSE3 is a component of the Nse1-Nse3-Nse4 subcomplex within the Smc5-6 complex. This subcomplex also bridges the head domains of Smc5 and Smc6.","method":"Biochemical purification of Smc5-6 from S. pombe, identification of subcomplexes by interaction mapping","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction mapping, two independent labs, replicated in multiple subsequent studies","pmids":["15601840"],"is_preprint":false},{"year":2006,"finding":"NSE3, as part of the Nse1-Nse3-Nse4 subcomplex, bridges the head domains of Smc5 and Smc6 in addition to the kleisin Nse4. The Nse1-Nse3-Nse4 and Nse5-Nse6 subcomplexes bind to the Smc5-Smc6 heads at different sites.","method":"In vitro protein interaction assays, structural predictions, domain mapping","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical interaction assays, single lab, multiple domain-mapping experiments","pmids":["17005570"],"is_preprint":false},{"year":2007,"finding":"The human NSMCE3/MAGEG1 protein is a bona fide component of the human SMC5-6 complex. Depletion of NSMCE3 leads to degradation of the other SMC5-6 subunits and sensitivity to methyl methanesulfonate. NSMCE3 is modified by sumoylation and ubiquitination.","method":"Co-immunoprecipitation, siRNA depletion, sensitivity assays, detection of post-translational modifications","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, siRNA knockdown with defined cellular phenotype, multiple orthogonal methods in one study","pmids":["18086888"],"is_preprint":false},{"year":2003,"finding":"MAGE-G1 (NSMCE3 ortholog/alias) interacts with the transcription factor E2F1 via its transactivation domain, represses E2F1-dependent transcription, and antagonizes E2F1-induced apoptosis. MAGE-G1 also interacts with the p75 neurotrophin receptor.","method":"Co-immunoprecipitation, colony formation assay, BrdU incorporation, transcriptional reporter assay in N1E-115 cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional transcriptional assay, single lab, multiple orthogonal methods","pmids":["14593116"],"is_preprint":false},{"year":2011,"finding":"A conserved hydrophobic surface on the C-terminal (WH/B) domain of NSE3/MAGEG1 mediates interaction with NSE4, and N-terminal (WH/A) domain residues are essential for interaction with NSE1. These interactions are conserved in human orthologs. MAGEG1 interaction with NSE4b results in transcriptional co-activation of the nuclear receptor SF1.","method":"Site-directed mutagenesis, yeast two-hybrid, Co-IP, molecular modelling, transcriptional reporter assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with multiple protein-protein interaction methods and functional reporter assay, single lab","pmids":["21364888"],"is_preprint":false},{"year":2015,"finding":"NSE3, as part of the NSE1/NSE3/NSE4 subcomplex, binds double-stranded DNA without sequence preference. Mutations of key basic residues in the NSE3 DNA-binding surface reduce DNA binding in vitro and cause cell death or hypersensitivity to DNA-damaging agents in vivo. A hypomorphic nse3 DNA-binding mutant shows reduced association of SMC5/6 with chromatin by ChIP.","method":"In vitro DNA binding assays, site-directed mutagenesis, S. pombe genome integration of mutants, chromatin immunoprecipitation (ChIP)","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution + mutagenesis + in vivo ChIP, multiple orthogonal methods","pmids":["26446992"],"is_preprint":false},{"year":2015,"finding":"NSE3 is structurally related to KITE (kleisin interacting tandem winged-helix elements) proteins and forms a heterodimer via its N-terminal WH domain, associating with the central part of the NSE4 kleisin subunit. In placental mammals, NSE3 gave rise to >60 MAGE-related KITE proteins.","method":"Structural similarity analysis, evolutionary bioinformatics, cross-species comparison","journal":"Structure","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — structural similarity analysis based on architectural comparison, supported by multiple evolutionary analyses","pmids":["26585514"],"is_preprint":false},{"year":2016,"finding":"Biallelic missense mutations in NSMCE3 disrupt interactions within the SMC5/6 complex, leading to destabilization of the complex. Patient cells show chromosome rearrangements, micronuclei, sensitivity to replication stress and DNA damage, and defective homologous recombination, causing a chromosome breakage syndrome with T and B cell immunodeficiency.","method":"Whole exome sequencing, Co-IP to test interaction disruption, cytogenetics, cell survival assays, HR assay in patient-derived cells","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient mutations tested by Co-IP for interaction disruption, multiple functional assays in patient cells, defined molecular mechanism","pmids":["27427983"],"is_preprint":false},{"year":2016,"finding":"NSE3 (Nse3 in S. cerevisiae) is required for Smc5/6 localization to telomeres. The temperature-sensitive nse3-1 mutant is defective in Smc5/6 telomere association, leading to defects in telomere clustering, Sir4 dispersion, and loss of transcriptional repression of sub-telomeric genes and TERRA. Nse3 physically interacts with the Rap1-binding factors Rif2 and Sir4.","method":"ChIP, co-immunoprecipitation, genetic interaction analysis, telomere length measurement","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and Co-IP combined with genetic analysis, single lab","pmids":["27564449"],"is_preprint":false},{"year":2012,"finding":"A conserved Nse3/MAGE-binding domain (NMBD) within Nse4/EID proteins mediates binding to NSE3/MAGE proteins. The central helical region of NSE4/EID binds into the conserved hydrophobic pocket of MAGE proteins, with structure modeling supporting this interaction mode.","method":"Site-directed mutagenesis, yeast two-hybrid, PEPSCAN ELISA, molecular docking/dynamics simulation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis combined with binding assays and structural modeling, single lab","pmids":["22536443"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of DNA-bound Smc5/6 (including Nse1-3-4 subcomplex) at 3.8 Å shows NSE3 secures the DNA double helix from above within a clamp structure. NSE3 contributes positively charged residues to the DNA-binding inner surface. Mutational data confirm distinct DNA-binding contributions of NSE3 to chromatin association and cell fitness.","method":"Cryo-EM structure determination, crosslinking mass spectrometry, in vivo mutational analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure at 3.8 Å with crosslinking MS and in vivo mutational validation, multiple orthogonal methods","pmids":["35648833"],"is_preprint":false},{"year":2021,"finding":"Crystal structure of Xenopus laevis Nse1-Nse3-Nse4 subcomplex at 1.7 Å resolution shows Nse1-Nse3 dimer adopts a closed conformation forming three interfaces with Nse4, forcing Nse4 into a Z-shaped conformation. Disease-causing NSMCE3 mutations (lung disease/immunodeficiency syndrome) could dislodge Nse4 from the Nse1-Nse3 complex based on structural analysis.","method":"X-ray crystallography at 1.7 Å, DNA binding assays, mutational analysis","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure with functional DNA-binding and mutational analyses","pmids":["33676928"],"is_preprint":false},{"year":2021,"finding":"NSE3 double-stranded DNA binding activity is critical for stable chromatin association of Smc5/6 in live cells. Disrupting Nse3 dsDNA binding reduces chromatin association, whereas disrupting ssDNA binding at the hinge does not prevent chromatin association but leads to elevated gross chromosomal rearrangements during replication restart.","method":"Single-molecule tracking in live fission yeast, defined point mutants in nse3","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — live-cell single-molecule tracking with defined separation-of-function mutants, mechanistically informative","pmids":["33860765"],"is_preprint":false},{"year":2020,"finding":"NSE3 depletion increases HPV-31 viral replication and transcription in keratinocytes maintaining episomal HPV-31, demonstrating that SMC5/6 (including NSE3) represses the HPV-31 replicative program.","method":"siRNA depletion of NSE3, viral replication and transcription assays, Co-IP","journal":"Pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with defined viral replication phenotype, Co-IP supporting interaction, single lab","pmids":["32992873"],"is_preprint":false},{"year":2020,"finding":"The human NSE1-NSE3 heterodimer and NSE1-NSE3-NSE4 subcomplex architecture was determined by crosslinking-MS. NSE3 (hNSE3/MAGEG1) is positioned near the SMC head domains in the rod-like Smc5/6 complex.","method":"Crosslinking mass spectrometry, electron microscopy","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — crosslinking MS with EM, single lab, multiple methods","pmids":["32389690"],"is_preprint":false},{"year":2022,"finding":"NSE3 (Nse3) stimulates the ubiquitin E3 ligase activity of NSE1 within the Smc5/6 complex. The Nse1 ligase activity is stimulated by Nse3 and Nse4 together using purified S. pombe proteins.","method":"In vitro ubiquitination assay with purified proteins, Nse1/Nse3/Nse4 combinations","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified components, single lab","pmids":["35011726"],"is_preprint":false},{"year":2017,"finding":"MAGE-G1 (NSMCE3) interacts with FSCN1 (fascin) and vimentin (VIME) during retinoic acid-induced neuronal differentiation of P19 cells, validated by GST pulldown and Co-IP.","method":"SILAC-based quantitative proteomics, GST pulldown, co-immunoprecipitation","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP and pulldown but single lab, no functional consequence demonstrated for NSMCE3 specifically","pmids":["28374796"],"is_preprint":false},{"year":2016,"finding":"Crystal structures of MAGE-A3 and MAGE-A4 reveal a terminal peptide bound in a deep cleft between two tandem-arranged winged helix domains. Comparison with an effector-bound MAGE-G1 structure suggests a major conformational rearrangement is required for binding, implying allosteric regulation of effector binding in MAGE-G1/NSMCE3.","method":"X-ray crystallography of MAGE-A3 and MAGE-A4; structural comparison with MAGE-G1","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — structural inference about MAGE-G1/NSMCE3 is comparative, not direct; no mutagenesis of MAGE-G1 itself","pmids":["26910052"],"is_preprint":false},{"year":2023,"finding":"C. elegans MAGE-1 (NSE3 ortholog) directly interacts with NSE-1 and NSE-4. Loss of mage-1/nse-3 reduces NSE-1 protein levels and causes NSE-1 mislocalization from nucleus to cytoplasm, indicating MAGE-1/NSE3 is essential for NSE-1 stability and proper SMC-5/6 complex function.","method":"Co-immunoprecipitation, GFP-tagged localization studies, genetic knockouts in C. elegans","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP combined with in vivo localization and stability assays in a metazoan model, mechanistically informative for the ortholog","pmids":["37579186"],"is_preprint":false},{"year":2025,"finding":"The HBx-DDB1 complex directly and simultaneously interacts with NSE3, a component of the SMC5/6 complex, as revealed by cryo-EM structure and biochemical analysis.","method":"Cryo-EM structure of HBx-DDB1 complex; biochemical interaction analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cryo-EM plus biochemical interaction data, single study, interaction with NSE3 confirmed biochemically","pmids":["40512786"],"is_preprint":false},{"year":2026,"finding":"The NSMCE1/NSMCE3 subcomplex is sufficient to inhibit HBV transcription in vitro and in cell-based assays. NSMCE1/3 promotes degradation of HBx via a ubiquitin-independent proteasomal mechanism; NSMCE1/3 interacts with the 20S proteasome but does not stimulate HBx ubiquitination. Knockdown of NSMCE3 promotes HBV proliferation.","method":"Cell-free transcription assay with purified proteins, RT-PCR, cycloheximide chase, proteasome inhibitor experiments, ubiquitination assay, Co-IP with 20S proteasome, siRNA knockdown","journal":"International journal of biological macromolecules","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods including in vitro reconstitution and cell-based knockdown, single lab, preprint status not indicated but published","pmids":["41825673"],"is_preprint":false}],"current_model":"NSMCE3 (MAGEG1/NSE3) is a KITE-family subunit of the SMC5/6 complex that forms a stable NSE1-NSE3-NSE4 subcomplex through conserved winged-helix domain interactions; it directly binds double-stranded DNA via basic residues to load SMC5/6 onto chromatin, is required for homologous recombination repair and chromosome segregation, can be sumoylated and ubiquitinated, stimulates NSE1 ubiquitin E3 ligase activity, bridges the SMC5/6 head domains, and is essential for complex integrity—with disease-causing missense mutations disrupting NSE1-NSE3-NSE4 assembly and causing a chromosome breakage/immunodeficiency syndrome; additionally, NSMCE1/3 can inhibit HBV transcription via ubiquitin-independent proteasomal degradation of HBx."},"narrative":{"mechanistic_narrative":"NSMCE3 (MAGEG1/NSE3) is a KITE-family subunit of the SMC5/6 genome-maintenance complex that is essential for chromosome segregation, homologous recombination repair, and resistance to DNA damage and replication stress [PMID:15331764, PMID:18086888, PMID:27427983]. It assembles a stable NSE1–NSE3–NSE4 subcomplex through conserved winged-helix domain contacts—N-terminal WH residues bind NSE1 and a C-terminal hydrophobic pocket binds the central helical NMBD region of the NSE4 kleisin—and this subcomplex bridges the SMC5 and SMC6 head domains [PMID:15601840, PMID:21364888, PMID:22536443, PMID:33676928]. Within this module NSE3 contributes basic residues that directly bind double-stranded DNA, clamping the duplex from above and loading SMC5/6 stably onto chromatin; disrupting this DNA-binding surface reduces chromatin association and causes hypersensitivity to genotoxic agents and elevated chromosomal rearrangements [PMID:26446992, PMID:35648833, PMID:33860765]. NSE3 is required for integrity of the whole complex, as its loss destabilizes and degrades partner subunits, and biallelic missense mutations that disrupt NSE1–NSE3–NSE4 assembly cause a chromosome-breakage syndrome with T- and B-cell immunodeficiency [PMID:18086888, PMID:27427983, PMID:33676928]. NSE3 is itself sumoylated by the NSE2 ligase and ubiquitinated, and together with NSE4 it stimulates the ubiquitin E3 ligase activity of NSE1 [PMID:15601841, PMID:15601840, PMID:18086888, PMID:35011726]. Beyond core complex function, NSMCE3 contributes to SMC5/6-mediated restriction of viral genomes, repressing HPV-31 replication and, as an NSMCE1/NSMCE3 subcomplex, inhibiting HBV transcription through ubiquitin-independent proteasomal degradation of HBx [PMID:32992873, PMID:40512786, PMID:41825673].","teleology":[{"year":2005,"claim":"Established that NSE3 is an integral subunit of the SMC5/6 complex and defined its immediate molecular neighborhood as a stable NSE1-NSE3-NSE4 subcomplex, anchoring later mechanistic work.","evidence":"Biochemical purification of Smc5-6 from S. pombe with interaction mapping and in vitro sumoylation assay","pmids":["15601841","15601840"],"confidence":"High","gaps":["Did not establish the DNA-binding or enzymatic activity of the subcomplex","Functional consequence of NSE3 sumoylation undefined"]},{"year":2004,"claim":"Placed NSE3 functionally in genome maintenance by showing it is essential for chromosome segregation, DNA damage resistance, and acts in the homologous recombination pathway.","evidence":"Genetic screen, co-purification, and epistasis with rhp51/rad51 plus genotoxin sensitivity assays in S. pombe","pmids":["15331764"],"confidence":"High","gaps":["Molecular activity of NSE3 within HR not defined","No structural basis for essentiality"]},{"year":2006,"claim":"Resolved how the subcomplex engages the SMC ATPase heads, showing the NSE1-NSE3-NSE4 and NSE5-NSE6 modules dock at distinct sites to bridge the Smc5/6 heads.","evidence":"In vitro interaction assays, domain mapping, and structural prediction","pmids":["17005570"],"confidence":"Medium","gaps":["Architecture inferred from mapping/prediction rather than a solved structure","Single lab"]},{"year":2007,"claim":"Demonstrated that the yeast findings extend to the human complex and that NSE3 is required for stability of the entire SMC5/6 complex, since its depletion degrades partner subunits and sensitizes cells to DNA damage.","evidence":"Reciprocal Co-IP, siRNA depletion, MMS sensitivity assays, and detection of sumoylation/ubiquitination of human NSMCE3","pmids":["18086888"],"confidence":"High","gaps":["Functional roles of NSE3 sumoylation and ubiquitination not dissected","Mechanism of subunit destabilization upon NSE3 loss unresolved"]},{"year":2011,"claim":"Mapped the residue-level interaction surfaces by which NSE3 binds NSE1 (N-terminal WH/A domain) and NSE4 (C-terminal WH/B hydrophobic surface), conserved in humans.","evidence":"Site-directed mutagenesis, yeast two-hybrid, Co-IP, modelling, and reporter assays","pmids":["21364888"],"confidence":"High","gaps":["Did not address DNA binding","SF1 co-activation role of MAGEG1 not connected to SMC5/6 function"]},{"year":2012,"claim":"Defined the reciprocal binding determinant on the kleisin, identifying the Nse3/MAGE-binding domain (NMBD) of NSE4 that inserts into the conserved NSE3 hydrophobic pocket.","evidence":"Mutagenesis, yeast two-hybrid, PEPSCAN ELISA, and molecular docking/dynamics","pmids":["22536443"],"confidence":"Medium","gaps":["Binding mode supported by modeling rather than a co-crystal","Single lab"]},{"year":2015,"claim":"Identified a core biochemical activity of NSE3—sequence-independent double-stranded DNA binding via basic residues—and linked it to chromatin loading of SMC5/6, converting NSE3 from a structural subunit to an active DNA-engaging element.","evidence":"In vitro DNA binding, mutagenesis, S. pombe genome integration of mutants, and ChIP; complemented by KITE/winged-helix structural classification","pmids":["26446992","26585514"],"confidence":"High","gaps":["Spatial arrangement of DNA on the subcomplex not resolved at this stage","Relationship between DNA binding and HR repair function indirect"]},{"year":2016,"claim":"Connected NSE3 to human disease by showing biallelic missense mutations destabilize the SMC5/6 complex and cause a chromosome-breakage/immunodeficiency syndrome, validating NSE3-dependent complex integrity in patients.","evidence":"Whole exome sequencing, Co-IP interaction-disruption tests, cytogenetics, survival and HR assays in patient cells; plus telomeric roles defined in S. cerevisiae","pmids":["27427983","27564449"],"confidence":"High","gaps":["Tissue-specific basis of immunodeficiency not explained","Telomere clustering role established only in budding yeast"]},{"year":2021,"claim":"Provided high-resolution structural and live-cell evidence for how NSE3 organizes the subcomplex and uses dsDNA binding to retain SMC5/6 on chromatin, including a structural rationale for disease mutations dislodging NSE4.","evidence":"1.7 Å Xenopus Nse1-Nse3-Nse4 crystal structure, crosslinking-MS/EM of human subcomplex, and single-molecule tracking of nse3 separation-of-function mutants in fission yeast","pmids":["33676928","32389690","33860765"],"confidence":"High","gaps":["dsDNA vs ssDNA contributions resolved functionally but not fully structurally","Human in-cell dynamics not directly measured"]},{"year":2022,"claim":"Captured NSE3 in the act of clamping DNA within the assembled Smc5/6 complex and established that NSE3 stimulates the partner NSE1 ubiquitin E3 ligase, defining both its DNA-engaging and enzyme-regulatory roles.","evidence":"3.8 Å cryo-EM of DNA-bound Smc5/6 with crosslinking-MS and in vivo mutation analysis; in vitro ubiquitination assays with purified Nse1/Nse3/Nse4","pmids":["35648833","35011726"],"confidence":"Medium","gaps":["Physiological ubiquitination substrate of the NSE1 ligase not identified","Coupling of DNA clamping to ATPase cycle unresolved"]},{"year":2026,"claim":"Extended NSE3 function to antiviral genome restriction, showing SMC5/6-NSE3 represses HPV-31 and that an NSMCE1/NSMCE3 subcomplex degrades HBx via a ubiquitin-independent proteasomal route to inhibit HBV.","evidence":"siRNA depletion with viral replication/transcription assays (HPV-31); cryo-EM of HBx-DDB1-NSE3, cell-free transcription, cycloheximide chase, proteasome inhibitor and 20S Co-IP experiments (HBV)","pmids":["32992873","40512786","41825673"],"confidence":"Medium","gaps":["Mechanism linking 20S proteasome recruitment to ubiquitin-independent HBx degradation not fully detailed","Generality of antiviral restriction across virus families unclear"]},{"year":null,"claim":"How NSE3 DNA clamping is mechanically coupled to the SMC5/6 ATPase cycle and to recruitment of the NSE1 ligase toward physiological substrates remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No identified physiological NSE1 ubiquitination substrate","ATP-dependent loading mechanism in humans not reconstituted","Functional meaning of NSE3 sumoylation/ubiquitination unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[7,12,14]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,3]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[17]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,20]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[7,14]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[1,9]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[9,15,22]}],"complexes":["SMC5/6 complex","NSE1-NSE3-NSE4 subcomplex"],"partners":["NSMCE1","NSMCE4A","NSMCE2","SMC5","SMC6"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96MG7","full_name":"Non-structural maintenance of chromosomes element 3 homolog","aliases":["Hepatocellular carcinoma-associated protein 4","MAGE-G1 antigen","Melanoma-associated antigen G1","Necdin-like protein 2"],"length_aa":304,"mass_kda":34.3,"function":"Component of the SMC5-SMC6 complex, a complex involved in repair of DNA double-strand breaks by homologous recombination (PubMed:20864041, PubMed:27427983). The complex may promote sister chromatid homologous recombination by recruiting the SMC1-SMC3 cohesin complex to double-strand breaks. The complex is required for telomere maintenance via recombination in ALT (alternative lengthening of telomeres) cell lines and mediates sumoylation of shelterin complex (telosome) components which is proposed to lead to shelterin complex disassembly in ALT-associated PML bodies (APBs). In vitro enhances ubiquitin ligase activity of NSMCE1. Proposed to act through recruitment and/or stabilization of the Ubl-conjugating enzyme (E2) at the E3:substrate complex (PubMed:20864041). May be a growth suppressor that facilitates the entry of the cell into cell cycle arrest (By similarity)","subcellular_location":"Cytoplasm; Nucleus; Chromosome, telomere","url":"https://www.uniprot.org/uniprotkb/Q96MG7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/NSMCE3","classification":"Common Essential","n_dependent_lines":1104,"n_total_lines":1208,"dependency_fraction":0.9139072847682119},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NSMCE3","total_profiled":1310},"omim":[{"mim_id":"617263","title":"NSE1 HOMOLOG, SMC5-SMC6 COMPLEX COMPONENT; NSMCE1","url":"https://www.omim.org/entry/617263"},{"mim_id":"617246","title":"NSE2 (MMS21) HOMOLOG, SMC5-SMC6 COMPLEX SUMO LIGASE; NSMCE2","url":"https://www.omim.org/entry/617246"},{"mim_id":"617241","title":"LUNG DISEASE, IMMUNODEFICIENCY, AND CHROMOSOME BREAKAGE SYNDROME; LICS","url":"https://www.omim.org/entry/617241"},{"mim_id":"612987","title":"NSE4 HOMOLOG A, SMC5-SMC6 COMPLEX COMPONENT; NSMCE4A","url":"https://www.omim.org/entry/612987"},{"mim_id":"608243","title":"NSE3 HOMOLOG, SMC5-SMC6 COMPLEX COMPONENT; NSMCE3","url":"https://www.omim.org/entry/608243"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NSMCE3"},"hgnc":{"alias_symbol":["HCA4","MAGEG1","MAGEL3","NSE3"],"prev_symbol":["NDNL2"]},"alphafold":{"accession":"Q96MG7","domains":[{"cath_id":"1.10.10.1200","chopping":"83-157","consensus_level":"high","plddt":91.5907,"start":83,"end":157},{"cath_id":"1.10.10.1210","chopping":"175-259","consensus_level":"high","plddt":89.0941,"start":175,"end":259}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96MG7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96MG7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96MG7-F1-predicted_aligned_error_v6.png","plddt_mean":74.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NSMCE3","jax_strain_url":"https://www.jax.org/strain/search?query=NSMCE3"},"sequence":{"accession":"Q96MG7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96MG7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96MG7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96MG7"}},"corpus_meta":[{"pmid":"15601841","id":"PMC_15601841","title":"Nse2, a component of the Smc5-6 complex, is a SUMO ligase required for the response to DNA damage.","date":"2005","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15601841","citation_count":196,"is_preprint":false},{"pmid":"15331764","id":"PMC_15331764","title":"Nse1, Nse2, and a novel subunit of the Smc5-Smc6 complex, Nse3, play a crucial role in meiosis.","date":"2004","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/15331764","citation_count":98,"is_preprint":false},{"pmid":"15601840","id":"PMC_15601840","title":"Composition and architecture of the Schizosaccharomyces pombe Rad18 (Smc5-6) complex.","date":"2005","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15601840","citation_count":98,"is_preprint":false},{"pmid":"26585514","id":"PMC_26585514","title":"Kite Proteins: a Superfamily of SMC/Kleisin Partners Conserved Across Bacteria, Archaea, and Eukaryotes.","date":"2015","source":"Structure 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The Nse2 SUMO ligase sumoylates Nse3 in vitro in an Nse2-dependent manner.\",\n      \"method\": \"Biochemical purification of Smc5-6 complex from S. pombe; in vitro sumoylation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro sumoylation assay with mutagenesis controls, replicated across two companion papers (PMID:15601841, PMID:15601840)\",\n      \"pmids\": [\"15601841\", \"15601840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NSE3 (Nse3) is an essential nuclear protein required for normal mitotic chromosome segregation, DNA damage resistance, and meiosis. Epistasis with Rhp51 (Rad51) places Nse3 in the homologous recombination repair pathway.\",\n      \"method\": \"Genetic screen, biochemical co-purification, epistasis analysis with rhp51 mutants, sensitivity assays to genotoxic agents\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis plus biochemical isolation, replicated in companion papers across multiple labs\",\n      \"pmids\": [\"15331764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NSE3 is a component of the Nse1-Nse3-Nse4 subcomplex within the Smc5-6 complex. This subcomplex also bridges the head domains of Smc5 and Smc6.\",\n      \"method\": \"Biochemical purification of Smc5-6 from S. pombe, identification of subcomplexes by interaction mapping\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction mapping, two independent labs, replicated in multiple subsequent studies\",\n      \"pmids\": [\"15601840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NSE3, as part of the Nse1-Nse3-Nse4 subcomplex, bridges the head domains of Smc5 and Smc6 in addition to the kleisin Nse4. The Nse1-Nse3-Nse4 and Nse5-Nse6 subcomplexes bind to the Smc5-Smc6 heads at different sites.\",\n      \"method\": \"In vitro protein interaction assays, structural predictions, domain mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical interaction assays, single lab, multiple domain-mapping experiments\",\n      \"pmids\": [\"17005570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The human NSMCE3/MAGEG1 protein is a bona fide component of the human SMC5-6 complex. Depletion of NSMCE3 leads to degradation of the other SMC5-6 subunits and sensitivity to methyl methanesulfonate. NSMCE3 is modified by sumoylation and ubiquitination.\",\n      \"method\": \"Co-immunoprecipitation, siRNA depletion, sensitivity assays, detection of post-translational modifications\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, siRNA knockdown with defined cellular phenotype, multiple orthogonal methods in one study\",\n      \"pmids\": [\"18086888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MAGE-G1 (NSMCE3 ortholog/alias) interacts with the transcription factor E2F1 via its transactivation domain, represses E2F1-dependent transcription, and antagonizes E2F1-induced apoptosis. MAGE-G1 also interacts with the p75 neurotrophin receptor.\",\n      \"method\": \"Co-immunoprecipitation, colony formation assay, BrdU incorporation, transcriptional reporter assay in N1E-115 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional transcriptional assay, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"14593116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A conserved hydrophobic surface on the C-terminal (WH/B) domain of NSE3/MAGEG1 mediates interaction with NSE4, and N-terminal (WH/A) domain residues are essential for interaction with NSE1. These interactions are conserved in human orthologs. MAGEG1 interaction with NSE4b results in transcriptional co-activation of the nuclear receptor SF1.\",\n      \"method\": \"Site-directed mutagenesis, yeast two-hybrid, Co-IP, molecular modelling, transcriptional reporter assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with multiple protein-protein interaction methods and functional reporter assay, single lab\",\n      \"pmids\": [\"21364888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NSE3, as part of the NSE1/NSE3/NSE4 subcomplex, binds double-stranded DNA without sequence preference. Mutations of key basic residues in the NSE3 DNA-binding surface reduce DNA binding in vitro and cause cell death or hypersensitivity to DNA-damaging agents in vivo. A hypomorphic nse3 DNA-binding mutant shows reduced association of SMC5/6 with chromatin by ChIP.\",\n      \"method\": \"In vitro DNA binding assays, site-directed mutagenesis, S. pombe genome integration of mutants, chromatin immunoprecipitation (ChIP)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution + mutagenesis + in vivo ChIP, multiple orthogonal methods\",\n      \"pmids\": [\"26446992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NSE3 is structurally related to KITE (kleisin interacting tandem winged-helix elements) proteins and forms a heterodimer via its N-terminal WH domain, associating with the central part of the NSE4 kleisin subunit. In placental mammals, NSE3 gave rise to >60 MAGE-related KITE proteins.\",\n      \"method\": \"Structural similarity analysis, evolutionary bioinformatics, cross-species comparison\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — structural similarity analysis based on architectural comparison, supported by multiple evolutionary analyses\",\n      \"pmids\": [\"26585514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Biallelic missense mutations in NSMCE3 disrupt interactions within the SMC5/6 complex, leading to destabilization of the complex. Patient cells show chromosome rearrangements, micronuclei, sensitivity to replication stress and DNA damage, and defective homologous recombination, causing a chromosome breakage syndrome with T and B cell immunodeficiency.\",\n      \"method\": \"Whole exome sequencing, Co-IP to test interaction disruption, cytogenetics, cell survival assays, HR assay in patient-derived cells\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient mutations tested by Co-IP for interaction disruption, multiple functional assays in patient cells, defined molecular mechanism\",\n      \"pmids\": [\"27427983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NSE3 (Nse3 in S. cerevisiae) is required for Smc5/6 localization to telomeres. The temperature-sensitive nse3-1 mutant is defective in Smc5/6 telomere association, leading to defects in telomere clustering, Sir4 dispersion, and loss of transcriptional repression of sub-telomeric genes and TERRA. Nse3 physically interacts with the Rap1-binding factors Rif2 and Sir4.\",\n      \"method\": \"ChIP, co-immunoprecipitation, genetic interaction analysis, telomere length measurement\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and Co-IP combined with genetic analysis, single lab\",\n      \"pmids\": [\"27564449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A conserved Nse3/MAGE-binding domain (NMBD) within Nse4/EID proteins mediates binding to NSE3/MAGE proteins. The central helical region of NSE4/EID binds into the conserved hydrophobic pocket of MAGE proteins, with structure modeling supporting this interaction mode.\",\n      \"method\": \"Site-directed mutagenesis, yeast two-hybrid, PEPSCAN ELISA, molecular docking/dynamics simulation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis combined with binding assays and structural modeling, single lab\",\n      \"pmids\": [\"22536443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of DNA-bound Smc5/6 (including Nse1-3-4 subcomplex) at 3.8 Å shows NSE3 secures the DNA double helix from above within a clamp structure. NSE3 contributes positively charged residues to the DNA-binding inner surface. Mutational data confirm distinct DNA-binding contributions of NSE3 to chromatin association and cell fitness.\",\n      \"method\": \"Cryo-EM structure determination, crosslinking mass spectrometry, in vivo mutational analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure at 3.8 Å with crosslinking MS and in vivo mutational validation, multiple orthogonal methods\",\n      \"pmids\": [\"35648833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal structure of Xenopus laevis Nse1-Nse3-Nse4 subcomplex at 1.7 Å resolution shows Nse1-Nse3 dimer adopts a closed conformation forming three interfaces with Nse4, forcing Nse4 into a Z-shaped conformation. Disease-causing NSMCE3 mutations (lung disease/immunodeficiency syndrome) could dislodge Nse4 from the Nse1-Nse3 complex based on structural analysis.\",\n      \"method\": \"X-ray crystallography at 1.7 Å, DNA binding assays, mutational analysis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure with functional DNA-binding and mutational analyses\",\n      \"pmids\": [\"33676928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NSE3 double-stranded DNA binding activity is critical for stable chromatin association of Smc5/6 in live cells. Disrupting Nse3 dsDNA binding reduces chromatin association, whereas disrupting ssDNA binding at the hinge does not prevent chromatin association but leads to elevated gross chromosomal rearrangements during replication restart.\",\n      \"method\": \"Single-molecule tracking in live fission yeast, defined point mutants in nse3\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell single-molecule tracking with defined separation-of-function mutants, mechanistically informative\",\n      \"pmids\": [\"33860765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NSE3 depletion increases HPV-31 viral replication and transcription in keratinocytes maintaining episomal HPV-31, demonstrating that SMC5/6 (including NSE3) represses the HPV-31 replicative program.\",\n      \"method\": \"siRNA depletion of NSE3, viral replication and transcription assays, Co-IP\",\n      \"journal\": \"Pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with defined viral replication phenotype, Co-IP supporting interaction, single lab\",\n      \"pmids\": [\"32992873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The human NSE1-NSE3 heterodimer and NSE1-NSE3-NSE4 subcomplex architecture was determined by crosslinking-MS. NSE3 (hNSE3/MAGEG1) is positioned near the SMC head domains in the rod-like Smc5/6 complex.\",\n      \"method\": \"Crosslinking mass spectrometry, electron microscopy\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — crosslinking MS with EM, single lab, multiple methods\",\n      \"pmids\": [\"32389690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NSE3 (Nse3) stimulates the ubiquitin E3 ligase activity of NSE1 within the Smc5/6 complex. The Nse1 ligase activity is stimulated by Nse3 and Nse4 together using purified S. pombe proteins.\",\n      \"method\": \"In vitro ubiquitination assay with purified proteins, Nse1/Nse3/Nse4 combinations\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified components, single lab\",\n      \"pmids\": [\"35011726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MAGE-G1 (NSMCE3) interacts with FSCN1 (fascin) and vimentin (VIME) during retinoic acid-induced neuronal differentiation of P19 cells, validated by GST pulldown and Co-IP.\",\n      \"method\": \"SILAC-based quantitative proteomics, GST pulldown, co-immunoprecipitation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP and pulldown but single lab, no functional consequence demonstrated for NSMCE3 specifically\",\n      \"pmids\": [\"28374796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structures of MAGE-A3 and MAGE-A4 reveal a terminal peptide bound in a deep cleft between two tandem-arranged winged helix domains. Comparison with an effector-bound MAGE-G1 structure suggests a major conformational rearrangement is required for binding, implying allosteric regulation of effector binding in MAGE-G1/NSMCE3.\",\n      \"method\": \"X-ray crystallography of MAGE-A3 and MAGE-A4; structural comparison with MAGE-G1\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — structural inference about MAGE-G1/NSMCE3 is comparative, not direct; no mutagenesis of MAGE-G1 itself\",\n      \"pmids\": [\"26910052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"C. elegans MAGE-1 (NSE3 ortholog) directly interacts with NSE-1 and NSE-4. Loss of mage-1/nse-3 reduces NSE-1 protein levels and causes NSE-1 mislocalization from nucleus to cytoplasm, indicating MAGE-1/NSE3 is essential for NSE-1 stability and proper SMC-5/6 complex function.\",\n      \"method\": \"Co-immunoprecipitation, GFP-tagged localization studies, genetic knockouts in C. elegans\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP combined with in vivo localization and stability assays in a metazoan model, mechanistically informative for the ortholog\",\n      \"pmids\": [\"37579186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The HBx-DDB1 complex directly and simultaneously interacts with NSE3, a component of the SMC5/6 complex, as revealed by cryo-EM structure and biochemical analysis.\",\n      \"method\": \"Cryo-EM structure of HBx-DDB1 complex; biochemical interaction analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cryo-EM plus biochemical interaction data, single study, interaction with NSE3 confirmed biochemically\",\n      \"pmids\": [\"40512786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"The NSMCE1/NSMCE3 subcomplex is sufficient to inhibit HBV transcription in vitro and in cell-based assays. NSMCE1/3 promotes degradation of HBx via a ubiquitin-independent proteasomal mechanism; NSMCE1/3 interacts with the 20S proteasome but does not stimulate HBx ubiquitination. Knockdown of NSMCE3 promotes HBV proliferation.\",\n      \"method\": \"Cell-free transcription assay with purified proteins, RT-PCR, cycloheximide chase, proteasome inhibitor experiments, ubiquitination assay, Co-IP with 20S proteasome, siRNA knockdown\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods including in vitro reconstitution and cell-based knockdown, single lab, preprint status not indicated but published\",\n      \"pmids\": [\"41825673\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NSMCE3 (MAGEG1/NSE3) is a KITE-family subunit of the SMC5/6 complex that forms a stable NSE1-NSE3-NSE4 subcomplex through conserved winged-helix domain interactions; it directly binds double-stranded DNA via basic residues to load SMC5/6 onto chromatin, is required for homologous recombination repair and chromosome segregation, can be sumoylated and ubiquitinated, stimulates NSE1 ubiquitin E3 ligase activity, bridges the SMC5/6 head domains, and is essential for complex integrity—with disease-causing missense mutations disrupting NSE1-NSE3-NSE4 assembly and causing a chromosome breakage/immunodeficiency syndrome; additionally, NSMCE1/3 can inhibit HBV transcription via ubiquitin-independent proteasomal degradation of HBx.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NSMCE3 (MAGEG1/NSE3) is a KITE-family subunit of the SMC5/6 genome-maintenance complex that is essential for chromosome segregation, homologous recombination repair, and resistance to DNA damage and replication stress [#1, #4, #9]. It assembles a stable NSE1–NSE3–NSE4 subcomplex through conserved winged-helix domain contacts—N-terminal WH residues bind NSE1 and a C-terminal hydrophobic pocket binds the central helical NMBD region of the NSE4 kleisin—and this subcomplex bridges the SMC5 and SMC6 head domains [#2, #6, #11, #13]. Within this module NSE3 contributes basic residues that directly bind double-stranded DNA, clamping the duplex from above and loading SMC5/6 stably onto chromatin; disrupting this DNA-binding surface reduces chromatin association and causes hypersensitivity to genotoxic agents and elevated chromosomal rearrangements [#7, #12, #14]. NSE3 is required for integrity of the whole complex, as its loss destabilizes and degrades partner subunits, and biallelic missense mutations that disrupt NSE1–NSE3–NSE4 assembly cause a chromosome-breakage syndrome with T- and B-cell immunodeficiency [#4, #9, #13]. NSE3 is itself sumoylated by the NSE2 ligase and ubiquitinated, and together with NSE4 it stimulates the ubiquitin E3 ligase activity of NSE1 [#0, #4, #17]. Beyond core complex function, NSMCE3 contributes to SMC5/6-mediated restriction of viral genomes, repressing HPV-31 replication and, as an NSMCE1/NSMCE3 subcomplex, inhibiting HBV transcription through ubiquitin-independent proteasomal degradation of HBx [#15, #21, #22].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established that NSE3 is an integral subunit of the SMC5/6 complex and defined its immediate molecular neighborhood as a stable NSE1-NSE3-NSE4 subcomplex, anchoring later mechanistic work.\",\n      \"evidence\": \"Biochemical purification of Smc5-6 from S. pombe with interaction mapping and in vitro sumoylation assay\",\n      \"pmids\": [\"15601841\", \"15601840\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the DNA-binding or enzymatic activity of the subcomplex\", \"Functional consequence of NSE3 sumoylation undefined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Placed NSE3 functionally in genome maintenance by showing it is essential for chromosome segregation, DNA damage resistance, and acts in the homologous recombination pathway.\",\n      \"evidence\": \"Genetic screen, co-purification, and epistasis with rhp51/rad51 plus genotoxin sensitivity assays in S. pombe\",\n      \"pmids\": [\"15331764\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular activity of NSE3 within HR not defined\", \"No structural basis for essentiality\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved how the subcomplex engages the SMC ATPase heads, showing the NSE1-NSE3-NSE4 and NSE5-NSE6 modules dock at distinct sites to bridge the Smc5/6 heads.\",\n      \"evidence\": \"In vitro interaction assays, domain mapping, and structural prediction\",\n      \"pmids\": [\"17005570\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Architecture inferred from mapping/prediction rather than a solved structure\", \"Single lab\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated that the yeast findings extend to the human complex and that NSE3 is required for stability of the entire SMC5/6 complex, since its depletion degrades partner subunits and sensitizes cells to DNA damage.\",\n      \"evidence\": \"Reciprocal Co-IP, siRNA depletion, MMS sensitivity assays, and detection of sumoylation/ubiquitination of human NSMCE3\",\n      \"pmids\": [\"18086888\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional roles of NSE3 sumoylation and ubiquitination not dissected\", \"Mechanism of subunit destabilization upon NSE3 loss unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mapped the residue-level interaction surfaces by which NSE3 binds NSE1 (N-terminal WH/A domain) and NSE4 (C-terminal WH/B hydrophobic surface), conserved in humans.\",\n      \"evidence\": \"Site-directed mutagenesis, yeast two-hybrid, Co-IP, modelling, and reporter assays\",\n      \"pmids\": [\"21364888\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address DNA binding\", \"SF1 co-activation role of MAGEG1 not connected to SMC5/6 function\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined the reciprocal binding determinant on the kleisin, identifying the Nse3/MAGE-binding domain (NMBD) of NSE4 that inserts into the conserved NSE3 hydrophobic pocket.\",\n      \"evidence\": \"Mutagenesis, yeast two-hybrid, PEPSCAN ELISA, and molecular docking/dynamics\",\n      \"pmids\": [\"22536443\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding mode supported by modeling rather than a co-crystal\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified a core biochemical activity of NSE3—sequence-independent double-stranded DNA binding via basic residues—and linked it to chromatin loading of SMC5/6, converting NSE3 from a structural subunit to an active DNA-engaging element.\",\n      \"evidence\": \"In vitro DNA binding, mutagenesis, S. pombe genome integration of mutants, and ChIP; complemented by KITE/winged-helix structural classification\",\n      \"pmids\": [\"26446992\", \"26585514\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial arrangement of DNA on the subcomplex not resolved at this stage\", \"Relationship between DNA binding and HR repair function indirect\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected NSE3 to human disease by showing biallelic missense mutations destabilize the SMC5/6 complex and cause a chromosome-breakage/immunodeficiency syndrome, validating NSE3-dependent complex integrity in patients.\",\n      \"evidence\": \"Whole exome sequencing, Co-IP interaction-disruption tests, cytogenetics, survival and HR assays in patient cells; plus telomeric roles defined in S. cerevisiae\",\n      \"pmids\": [\"27427983\", \"27564449\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific basis of immunodeficiency not explained\", \"Telomere clustering role established only in budding yeast\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided high-resolution structural and live-cell evidence for how NSE3 organizes the subcomplex and uses dsDNA binding to retain SMC5/6 on chromatin, including a structural rationale for disease mutations dislodging NSE4.\",\n      \"evidence\": \"1.7 Å Xenopus Nse1-Nse3-Nse4 crystal structure, crosslinking-MS/EM of human subcomplex, and single-molecule tracking of nse3 separation-of-function mutants in fission yeast\",\n      \"pmids\": [\"33676928\", \"32389690\", \"33860765\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"dsDNA vs ssDNA contributions resolved functionally but not fully structurally\", \"Human in-cell dynamics not directly measured\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Captured NSE3 in the act of clamping DNA within the assembled Smc5/6 complex and established that NSE3 stimulates the partner NSE1 ubiquitin E3 ligase, defining both its DNA-engaging and enzyme-regulatory roles.\",\n      \"evidence\": \"3.8 Å cryo-EM of DNA-bound Smc5/6 with crosslinking-MS and in vivo mutation analysis; in vitro ubiquitination assays with purified Nse1/Nse3/Nse4\",\n      \"pmids\": [\"35648833\", \"35011726\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological ubiquitination substrate of the NSE1 ligase not identified\", \"Coupling of DNA clamping to ATPase cycle unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Extended NSE3 function to antiviral genome restriction, showing SMC5/6-NSE3 represses HPV-31 and that an NSMCE1/NSMCE3 subcomplex degrades HBx via a ubiquitin-independent proteasomal route to inhibit HBV.\",\n      \"evidence\": \"siRNA depletion with viral replication/transcription assays (HPV-31); cryo-EM of HBx-DDB1-NSE3, cell-free transcription, cycloheximide chase, proteasome inhibitor and 20S Co-IP experiments (HBV)\",\n      \"pmids\": [\"32992873\", \"40512786\", \"41825673\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking 20S proteasome recruitment to ubiquitin-independent HBx degradation not fully detailed\", \"Generality of antiviral restriction across virus families unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NSE3 DNA clamping is mechanically coupled to the SMC5/6 ATPase cycle and to recruitment of the NSE1 ligase toward physiological substrates remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No identified physiological NSE1 ubiquitination substrate\", \"ATP-dependent loading mechanism in humans not reconstituted\", \"Functional meaning of NSE3 sumoylation/ubiquitination unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [7, 12, 14]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 20]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [7, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [1, 9]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [9, 15, 22]}\n    ],\n    \"complexes\": [\"SMC5/6 complex\", \"NSE1-NSE3-NSE4 subcomplex\"],\n    \"partners\": [\"NSMCE1\", \"NSMCE4A\", \"NSMCE2\", \"SMC5\", \"SMC6\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}