{"gene":"SENP2","run_date":"2026-06-10T07:46:30","timeline":{"discoveries":[{"year":2002,"finding":"SENP2 localizes to the nuclear face of nuclear pore complexes (NPCs) through its N-terminal domain, which directly binds Nup153, a nucleoporin on the nucleoplasmic face of the pore. Removal of the Nup153-interacting region alters the spectrum of SUMO-1 conjugates within the cell, suggesting NPC association restricts SENP2 activity to a subset of nuclear SUMOylated proteins.","method":"Co-immunoprecipitation, in vivo localization, N-terminal deletion mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding demonstrated with domain-mapping, functional consequence of disruption shown, replicated by multiple subsequent studies","pmids":["11896061"],"is_preprint":false},{"year":2004,"finding":"X-ray crystal structures of human SENP2 catalytic domain alone and as a covalent thiohemiacetal transition-state complex with SUMO-1 revealed the protease and substrate surfaces mediating interaction. SENP2 processes SUMO-1, SUMO-2, and SUMO-3 precursors (maturation) and deconjugates them from substrates, with activity dependent on residues C-terminal to the conserved Gly-Gly motif of SUMO.","method":"X-ray crystallography, in vitro biochemical maturation and deconjugation assays, SUMO tail-swap and Gly-Gly insertion mutants","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure of transition-state complex with mutagenesis and in vitro biochemical validation in one rigorous study","pmids":["15296745"],"is_preprint":false},{"year":2006,"finding":"Crystal structures of catalytically inert SENP2 protease domain complexed with RanGAP1-SUMO-1, RanGAP1-SUMO-2, SUMO-2 precursor, and SUMO-3 precursor revealed a 90° kink near the scissile bond that directs the substrate lysine toward a protease surface optimized for lysine deconjugation. SENP2 residue Met497 was identified as a key determinant of SUMO isoform specificity; SENP2 catalyzes deconjugation more efficiently than processing.","method":"X-ray crystallography (multiple complex structures), mutagenesis, in vitro deconjugation/processing assays","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple crystal structures, active-site mutagenesis, and in vitro biochemical validation in one rigorous study","pmids":["17099700"],"is_preprint":false},{"year":2011,"finding":"SENP2 dynamically associates with NPCs via multiple N-terminal elements: (1) a nuclear localization signal that tethers SENP2 to FG-repeat nucleoporins through karyopherins, (2) a domain that directly contacts the Nup107-160 subcomplex, and (3) a nuclear export signal. Disruption of these interactions increases SENP2 substrate accessibility in cells.","method":"FRAP (fluorescence recovery after photobleaching), domain-deletion mutants, Co-IP with karyopherins and Nup107-160 subcomplex, in vivo localization","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — FRAP, co-IP, domain mapping with functional consequence, multiple orthogonal methods in one study","pmids":["22031293"],"is_preprint":false},{"year":2011,"finding":"SENP2 is the primary SUMO protease that associates with NEMO, deSUMOylates NEMO, and inhibits DNA damage-induced NF-κB activation. NF-κB transcriptionally induces SENP2 (and SENP1) in response to genotoxic stimuli via ATM-dependent histone methylation at SENP2 promoter κB regions, creating a negative feedback loop. SENP2-null cells show biphasic NEMO SUMOylation, sustained IKK/NF-κB activation, and higher resistance to DNA damage-induced cell death.","method":"Co-IP, deSUMOylation assay, SENP2-null cells, overexpression/knockdown, chromatin immunoprecipitation, promoter analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, ChIP, null cells, functional rescue), clear epistatic pathway placement","pmids":["21777808"],"is_preprint":false},{"year":2011,"finding":"SENP2 deSUMOylates IRF3, which then undergoes K48-linked ubiquitination at the same sites (K70 and K87) used for SUMOylation, leading to proteasomal degradation. SUMOylation and K48-ubiquitination of IRF3 are competitive at these lysines. SENP2-deficient cells have elevated IRF3 SUMOylation, reduced ubiquitination/degradation, higher IFN-β production, and reduced viral replication.","method":"Overexpression, siRNA knockdown, site-directed mutagenesis (K70R/K87R), ubiquitination assays, SENP2-deficient cells","journal":"Journal of molecular cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (mutagenesis, ubiquitination assays, KD/KO with defined molecular and functional phenotypes)","pmids":["22028379"],"is_preprint":false},{"year":2010,"finding":"SENP2 is required for adipogenesis by deSUMOylating and stabilizing C/EBPβ. SUMOylation of C/EBPβ promotes its ubiquitination and proteasomal degradation; SENP2 reverses this. SENP2 knockdown prevents adipocyte differentiation by reducing C/EBPβ protein levels (without affecting mRNA), leading to decreased PPARγ and C/EBPα expression. Overexpression of C/EBPβ rescues the SENP2-knockdown adipogenesis defect.","method":"siRNA knockdown, overexpression, in vivo preadipocyte implantation, ubiquitination assays, rescue experiments","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockdown with specific phenotype, genetic rescue, ubiquitination assay, in vivo validation, multiple orthogonal methods","pmids":["20194620"],"is_preprint":false},{"year":2012,"finding":"Two distinct sites in Nup153 bind SENP2 and SENP1: the unique N-terminal domain and a specific region within the C-terminal FG-rich region of Nup153. Nup153 itself is a substrate for SUMOylation, and depletion of SENP1/SENP2 by RNAi or expression of dominant-negative mutants increases endogenous Nup153 SUMOylation. Unlike SENP1, SENP2 levels are not affected by changes in Nup153 abundance.","method":"Co-IP, RNAi, dominant-negative mutants, SUMOylation assays","journal":"Nucleus","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with domain mapping and functional consequence, single lab","pmids":["22688647"],"is_preprint":false},{"year":2013,"finding":"SENP1 and SENP2 are targeted to kinetochores during mitosis. SENP2 kinetochore targeting requires the Nup107-160 NPC subcomplex and is modulated by karyopherin α interactions. Overexpression of SENP2 (but not other SUMO isopeptidases) causes chromosome congression defects dependent on precise kinetochore targeting. RNAi knockdown of SENP1 (but not SENP2) delays sister chromatid separation at metaphase.","method":"Live-cell imaging, siRNA knockdown, overexpression, kinetochore targeting assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization imaging with functional phenotype, domain-specific targeting requirements established, multiple SENP family members tested as controls","pmids":["24048451"],"is_preprint":false},{"year":2013,"finding":"SENP1 and SENP2 co-depletion causes mislocalization of many nucleoporins and in some cases reduces their levels, revealing a role for pore-associated SENPs in nucleoporin homeostasis and proper NPC configuration. Remaining NPCs retain transport capability but with altered kinetics.","method":"RNAi co-depletion, immunofluorescence, transport assays","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization and functional transport assays after co-depletion, single lab","pmids":["24196834"],"is_preprint":false},{"year":2013,"finding":"SENP2 interacts with ERα via its N-terminal region (binding the hinge region of ERα) and represses ERα-mediated transcription independently of its SUMO protease activity through a transcriptional repressive domain in its N-terminus. This domain recruits HDAC3 to be fully active. SENP2 also represses estrogen-dependent and independent proliferation of MCF7 cells, requiring both its proteolytic and transcriptional repressive activities.","method":"GST pulldown, Co-IP, proximity ligation assay, reporter assays, siRNA, chromatin immunoprecipitation, deletion mutants","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding assays plus functional domain dissection, single lab","pmids":["24422630"],"is_preprint":false},{"year":2015,"finding":"Disturbed flow activates p90RSK, which phosphorylates SENP2 at threonine 368 (T368). T368 phosphorylation promotes nuclear export of SENP2, leading to decreased eNOS expression and increased pro-inflammatory adhesion molecule expression and apoptosis. In an atherosclerosis mouse model, EC-specific DN-p90RSK is protective, and SENP2 depletion abolishes this protective effect.","method":"In vivo kinase assay, phospho-mutant overexpression, nuclear fractionation, LDLR-deficient mouse model, EC-specific transgenic overexpression","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo kinase phosphorylation with specific site identified, nuclear export demonstrated by fractionation, epistasis confirmed in vivo with double-transgenic mice","pmids":["25689261"],"is_preprint":false},{"year":2015,"finding":"SENP2 promotes fatty acid oxidation in skeletal muscle by deSUMOylating PPARδ and PPARγ, which enhances their recruitment to promoters of FAO genes (CPT1b and ACSL1). Palmitate treatment induces NF-κB-mediated SENP2 upregulation. Muscle-specific SENP2 overexpression in mice increases FAO and alleviates high-fat diet-induced obesity and insulin resistance.","method":"ChIP, overexpression in myotubes, muscle-specific transgenic mice, FAO assays, siRNA","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating promoter recruitment, in vitro and in vivo validation, specific molecular mechanism identified","pmids":["25784542"],"is_preprint":false},{"year":2018,"finding":"SENP2 deSUMOylates SET domain bifurcated 1 (Setdb1). SUMOylation of Setdb1 promotes its occupancy at the Pparg and Cebpa gene promoters and suppresses their expression via H3K9me3 histone methylation. Adipocyte-specific Senp2 deficiency leads to accumulation of SUMOylated Setdb1, reduced Pparg/Cebpa expression, and decreased adipose lipid storage.","method":"Co-IP, ChIP, adipocyte-specific Senp2 knockout mice, SUMOylation assays","journal":"Journal of molecular cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, ChIP, in vivo knockout with specific molecular mechanism linking deSUMOylation to epigenetic regulation","pmids":["29272473"],"is_preprint":false},{"year":2018,"finding":"SENP2 is targeted to intracellular membranes (ER, Golgi, inner nuclear membrane) via a predicted N-terminal amphipathic α-helix that directly binds membranes in vitro. Karyopherin-α binding to SENP2 regulates this membrane association. BioID proximity labeling confirmed interactions with ER, Golgi, and inner nuclear membrane-associated proteins.","method":"In vivo localization, in vitro membrane binding assay, BioID, karyopherin-α interaction studies, amphipathic helix mutants","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro direct membrane binding assay, in vivo localization, and BioID interactome in one study","pmids":["29874116"],"is_preprint":false},{"year":2019,"finding":"SENP2 deSUMOylates MDC1 to prevent its excessive SUMOylation and subsequent RNF4-VCP-mediated clearance from DSBs, thereby promoting NHEJ. In homologous recombination (HR), SENP2 activity provides free SUMO. Increased SENP2 expression (as in chromosome 3q amplification) prolongs MDC1 focus retention, increases NHEJ efficiency, and promotes radioresistance.","method":"SUMOylation assays, focus retention imaging, NHEJ/HR reporter assays, SENP2 overexpression/knockdown, RNF4-VCP epistasis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple repair pathway reporter assays, substrate identification, epistasis with RNF4-VCP, multiple orthogonal methods","pmids":["30796017"],"is_preprint":false},{"year":2019,"finding":"EBV oncoprotein LMP1 increases SUMOylation of SENP2 at K48 and K447 in a CTAR-dependent manner, decreases SENP2 activity, inhibits SENP2 ubiquitination, reduces SENP2 turnover, and alters SENP2 localization. Inhibition of ubiquitination alone is sufficient to mimic LMP1-induced changes in SENP2 activity and trafficking.","method":"SUMO modification assays, ubiquitination assays, localization imaging, LMP1 mutant analysis, site-directed mutagenesis (K48/K447)","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple PTM assays and localization data in one study, single lab","pmids":["31266997"],"is_preprint":false},{"year":2019,"finding":"SENP2 deSUMOylates TBL1/TBLR1, which prevents formation of complexes with β-catenin that facilitate β-catenin nuclear translocation. Through this mechanism, SENP2 suppresses MMP13 expression and inhibits bladder cancer cell migration and invasion.","method":"Co-IP, β-catenin nuclear fractionation, overexpression/knockdown, SUMOylation assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP with nuclear fractionation, mechanistic pathway placed, single lab","pmids":["26369384"],"is_preprint":false},{"year":2019,"finding":"SENP2 deSUMOylates TGF-β receptor I (TGF-βRI), thereby suppressing TGF-β signaling and TGF-β-induced epithelial-mesenchymal transition in bladder cancer cells.","method":"Co-IP, SUMOylation assays, overexpression/knockdown, in vivo tumor metastasis model","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and SUMOylation assay identifying specific substrate, in vivo validation, single lab","pmids":["28574613"],"is_preprint":false},{"year":2019,"finding":"SENP2 co-immunoprecipitates with and directly deSUMOylates OAT3 in rat kidney; SENP2 overexpression reduces OAT3 SUMOylation, expression, and transport activity in COS-7 cells, while SENP2 knockdown has opposite effects. A catalytic mutant of SENP2 does not affect OAT3.","method":"Co-IP from rat kidney, overexpression, siRNA knockdown, catalytic mutant, transport activity assay","journal":"Biochimica et biophysica acta. Biomembranes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct Co-IP from tissue, catalytic mutant control, transport functional readout, single lab","pmids":["31054272"],"is_preprint":false},{"year":2020,"finding":"SENP2 silencing in multiple myeloma cells increases SUMO2-conjugated IκBα, leading to NF-κB activation and bortezomib resistance. SENP2 overexpression sensitizes cells to bortezomib by promoting IκBα deSUMOylation and suppressing NF-κB.","method":"siRNA knockdown, overexpression, SUMO2 conjugation assays (Co-IP), NF-κB reporter assay, drug sensitivity assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for SUMOylated IκBα, overexpression and knockdown with functional drug resistance readout, single lab","pmids":["31964975"],"is_preprint":false},{"year":2021,"finding":"SENP2 deSUMOylates DRP1 (a mitochondrial fission protein); SENP2 deficiency in pancreatic β cells increases SUMO2/3 conjugation to DRP1, suppresses DRP1 S616 phosphorylation, induces mitochondrial elongation and dysfunction, and impairs glucose-stimulated insulin secretion. SENP2 overexpression restores GSIS impairment caused by DRP1 knockdown.","method":"β cell-specific Senp2 knockout mice, SUMO conjugation assays, phospho-DRP1 Western blot, mitochondrial morphology imaging, GSIS assays, rescue overexpression","journal":"Experimental & molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO mouse model, molecular mechanism linking deSUMOylation to DRP1 phosphorylation and mitochondrial function, functional rescue","pmids":["35064188"],"is_preprint":false},{"year":2021,"finding":"SENP2 deSUMOylates AMPKα, promoting its ubiquitination and proteasomal degradation, thereby reducing AMPKα protein stability. Loss of hepatic SENP2 increases AMPKα stability, reduces gluconeogenesis, and protects against high-fat diet-induced hyperglycemia. AMPKα kinase inhibition reverses the effect of SENP2 deficiency on gluconeogenesis.","method":"Hepatic SENP2 knockout mice, Co-IP, in vitro deSUMOylation assay, ubiquitination assay, epistasis with AMPKα inhibitor, liver-specific adenoviral overexpression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — liver-specific KO, in vitro deSUMOylation assay, ubiquitination assay, epistatic rescue with AMPKα inhibitor","pmids":["34971706"],"is_preprint":false},{"year":2021,"finding":"SENP2 deSUMOylates Akt; SENP2 deficiency increases Akt SUMOylation and kinase activity, decreases GSK3β levels, and promotes cardiomyocyte proliferation and angiogenesis, improving cardiac function after myocardial infarction. SENP2 expression increases during postnatal heart development.","method":"SENP2-deficient mice and cells, SUMOylation assays, Akt kinase assay, cardiomyocyte proliferation and MI model","journal":"Clinical science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SUMOylation assay for specific substrate, kinase activity assay, in vivo cardiac phenotype, single lab","pmids":["33687053"],"is_preprint":false},{"year":2021,"finding":"SENP2 deSUMOylates MEF2A; SENP2 is the major de-SUMOylation enzyme for MEF2A identified by an unbiased shRNA screen. SUMOylated MEF2A accumulates in SENP2-knockdown cells and SENP2-knockout embryos. SENP2 enhances MEF2A transcriptional activity directly via deSUMOylation, and SENP2 protein accumulates in response to activity-dependent stimuli to mediate activity-dependent MEF2A deSUMOylation.","method":"shRNA screen, in vivo SUMOylation assays, SENP2-knockout embryos, overexpression, activity-dependent stimulation","journal":"Molecular biology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — unbiased screen plus in vivo knockout validation of substrate, single lab","pmids":["23224591"],"is_preprint":false},{"year":2021,"finding":"SENP2 deficiency in neurons leads to hyper-SUMOylation of Kv7.2 and Kv7.3 potassium channel subunits. Hyper-SUMOylated Kv7.2/Kv7.3 show reduced PIP2 binding and decreased interaction with CaM1, impairing CaM1-mediated channel assembly. Mutation of Kv7.2/Kv7.3 SUMOylation sites decreases CaM1 binding and enhances channel assembly. SENP2-deficient mice develop spontaneous seizures due to reduced M-currents, and also display elevated acetylcholine/increased vagal tone causing cardiac arrhythmias.","method":"SENP2-deficient mice, SUMOylation site mutagenesis, PIP2 binding assay, CaM1 Co-IP, electrophysiology (M-current recording), pharmacological rescue (atropine, vagotomy, retigabine)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mice with defined electrophysiological phenotype, mutagenesis of SUMOylation sites, multiple binding assays, pharmacological rescue in vivo","pmids":["34509475"],"is_preprint":false},{"year":2021,"finding":"SENP2 deficiency causes hyper-SUMOylation of SMN protein (modified by SUMO2 with E3 ligase PIAS2α). SUMOylated SMN undergoes ubiquitin-proteasome degradation via UBA1 and E3 ligase ITCH. SUMOylation also increases SMN acetylation and inhibits Cajal body formation. SENP2-deficient mice develop SMA-like pathology with decreased muscle fibers and motor neurons.","method":"SENP2-deficient mouse model, SUMO assays, ubiquitination assays, co-IP, E3 ligase identification, Cajal body imaging","journal":"Journal of molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with SMA phenotype, E3 ligase identified, ubiquitin-proteasome pathway established, multiple orthogonal methods","pmids":["34628513"],"is_preprint":false},{"year":2021,"finding":"SENP2 deSUMOylates PLCβ4, preventing SUMO-dependent ubiquitin-mediated degradation catalyzed by PIAS2α and RNF4. SUMOylated PLCβ4 is transported to the nucleus via Nup205- and RanBP2-dependent pathways. SENP2-deficient mice show decreased PLCβ4, reduced IP3 formation, dysregulated intracellular calcium homeostasis, and defects in neurogenesis.","method":"Co-IP, SUMOylation assays, SENP2-deficient mice, calcium imaging, nuclear import assays, neurogenesis assays","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, SUMO-ubiquitin pathway established, in vivo KO with neurogenesis phenotype, mechanistic pathway placement","pmids":["34465891"],"is_preprint":false},{"year":2022,"finding":"SENP2 deSUMOylates C/EBPβ; sumoylated C/EBPβ recruits the transcriptional repressor DAXX to suppress HOXC10 (a browning inhibitor) expression. Adipocyte-specific Senp2 knockout (Senp2-aKO) mice are resistant to diet-induced obesity due to increased thermogenic gene expression and beige adipocyte accumulation. SENP2 thus operates in a SENP2-C/EBPβ-HOXC10 axis that controls beige adipogenesis.","method":"Adipocyte-specific Senp2 KO mice, SUMOylation assays, Co-IP (DAXX recruitment), ChIP, energy expenditure measurements","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO mouse with metabolic phenotype, Co-IP, ChIP, molecular mechanism dissected with substrate and downstream effectors","pmids":["35196497"],"is_preprint":false},{"year":2022,"finding":"SENP2 promotes phenotypic switching of vascular smooth muscle cells by deSUMOylating myocardin at K573 (modified by SUMO-1 via E3 ligase PIAS4). SUMO-1 modification stabilizes myocardin, whereas SENP2-mediated deSUMOylation facilitates proteasome-dependent myocardin degradation.","method":"Co-IP, SUMOylation site mutagenesis (K573), overexpression, proteasome inhibitor assays, PIAS4 ligase identification, smooth muscle cell phenotype assays","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis, E3 ligase identified, functional VSMC phenotype, single lab","pmids":["36293488"],"is_preprint":false},{"year":2023,"finding":"SENP2 is present in mitochondria where it deSUMOylates SDHA (SUMOylated by PIAS3). SUMOylation of SDHA controls assembly and activity of the SDH complex. CBP acetyltransferase acetylates SENP2, negatively regulating its deSUMOylation activity. Under glutamine deprivation, decreased CBP levels activate SENP2, leading to SDHA deSUMOylation, dampened TCA cycle/ETC activity, and succinate accumulation to limit ROS and promote cancer cell survival.","method":"Co-IP, mitochondrial fractionation, in vitro deSUMOylation assay, acetylation assay, PIAS3 ligase identification, SDH activity assay, glutamine deprivation experiments","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — mitochondrial localization established, in vitro activity assay, E3 ligase and acetyltransferase identified, pathway mechanism established with multiple orthogonal methods","pmids":["36708515"],"is_preprint":false},{"year":2023,"finding":"SENP2 deSUMOylates SERCA2a; during myocardial ischemia/reperfusion injury (I/RI), SENP2 expression increases in the cytoplasm and promotes SERCA2a deSUMOylation, leading to calcium overload in cardiomyocytes. Inhibition of SENP2 (but not SENP1) reverses the I/RI-induced decline of SERCA2a SUMOylation, reduces infarct area, and improves cardiac function.","method":"Adenoviral overexpression/suppression, immunoprecipitation for SERCA2a SUMOylation, echocardiography, infarct staining, subcellular fractionation","journal":"Chinese medical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct measurement of substrate SUMOylation with functional cardiac phenotype, single lab","pmids":["37462038"],"is_preprint":false},{"year":2023,"finding":"SENP2 deSUMOylates Smad4, reducing its nuclear entry and suppressing Rorc expression, thereby restraining pathogenic Th17 differentiation. T cell-specific Senp2 deletion exacerbates experimental colitis with elevated GM-CSF+IL-17A+ pathogenic Th17 cells. Adoptive transfer experiments confirmed cell-autonomous function of SENP2 in Th17 restraint.","method":"T cell-specific Senp2 knockout mice, SUMOylation assay for Smad4, nuclear fractionation, adoptive transfer, colitis model","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO, substrate (Smad4) deSUMOylation with nuclear entry consequence, adoptive transfer for cell-autonomous confirmation","pmids":["37301920"],"is_preprint":false},{"year":2019,"finding":"SENP2 is required for SUMO2/SUMO3 regulation of placentation. SENP2 loss causes placental deficiencies linked to SUMO2/3 hyper-modification; reducing SUMO2 or SUMO3 gene dosage alleviates placental defects in SENP2 knockout mice, establishing genetic interaction between SENP2 and SUMO2/3 for trophoblast development.","method":"Genetic epistasis (SENP2 KO × SUMO2 or SUMO3 heterozygous mouse crosses), histology, embryonic phenotype analysis","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in vivo with phenotypic rescue, single lab","pmids":["31625212"],"is_preprint":false},{"year":2018,"finding":"SENP2 deSUMOylates NDR1 (STK38) at K465; SUMOylation of NDR1 attenuates its inhibition of p38/ERK1/2 activation by decreasing NDR1 association with MEK kinase 1/2. Low-level laser irradiation increases NDR1 SUMOylation by downregulating SENP2, leading to faster keratinocyte migration.","method":"Co-IP, SUMOylation site mutagenesis (K465), kinase activity assays, SENP2 overexpression/knockdown, keratinocyte migration assay","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis, Co-IP, kinase pathway placement, functional migration readout, single lab","pmids":["29969578"],"is_preprint":false},{"year":2025,"finding":"SENP2 deSUMOylates NCOA4 at SUMO1 sites K81, K343, and K600. SUMOylation enhances NCOA4 stability via interaction with the deubiquitinase OTUB1 (which directly deubiquitinates NCOA4). SENP2-mediated deSUMOylation disrupts NCOA4-OTUB1 interaction, reduces NCOA4 stability, and alleviates ferritinophagy-dependent ferroptosis in cardiomyocytes after MI/R injury.","method":"Co-IP, SUMOylation site mutagenesis (K81/K343/K600), NCOA4 stability assays, SENP2 overexpression/deletion, in vivo MI/R model","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis, Co-IP establishing NCOA4-OTUB1 interaction, in vivo MI/R model, single lab","pmids":["40366738"],"is_preprint":false},{"year":2025,"finding":"SENP2 cleaves α-synuclein at its N-terminus (non-canonical proteolytic activity distinct from SUMO deconjugation). N-terminally truncated αSyn seeds released from pathological neurons promote SDS-resistant high-molecular oligomer formation in vitro. SENP2 inhibition suppresses αSyn aggregate formation and propagation in cultured neurons and mouse brains.","method":"In vitro protease assay with recombinant αSyn, oligomerization assay, SENP2 inhibition in neuronal models and in vivo mouse brain","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro direct proteolytic assay with recombinant substrate, in vivo inhibition with aggregate phenotype, single lab, novel non-SUMO substrate claim","pmids":["40028275"],"is_preprint":false},{"year":2025,"finding":"CHK1 kinase phosphorylates SENP2 at S344 under laminar flow conditions. S344 phosphorylation inhibits ERK5 and p53 SUMOylation, suppressing endothelial cell activation. A SENP2 S344A knock-in mutation (generated by CRISPR/Cas9) in mice increases EC inflammation, migration, proliferation, apoptosis, and fibrotic changes.","method":"Phospho-specific antibody generation, CRISPR/Cas9 knock-in mice (S344A), kinase assays, CHK1 inhibitor experiments","journal":"Frontiers in cardiovascular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR knock-in phospho-site mutation with in vivo phenotype and kinase identified, single lab","pmids":["37711550"],"is_preprint":false},{"year":2025,"finding":"USP44 deubiquitinase interacts with SENP2 and stabilizes it through deubiquitination, as shown by Co-IP and cycloheximide chase assays. Knockdown of SENP2 reduces the inhibitory effect of USP44 on ESCC cell migration and invasion.","method":"Co-IP, LC-MS, cycloheximide chase, ubiquitination analysis, siSENP2 epistasis","journal":"Clinical epigenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and CHX chase demonstrating deubiquitination-mediated SENP2 stabilization, epistasis in functional assay, single lab","pmids":["41250203"],"is_preprint":false},{"year":2029,"finding":"SENP2 deSUMOylates ERRα; sumoylated ERRα cannot bind its DNA-binding site (ERRE) in the Ucp1 promoter. SENP2-mediated deSUMOylation of ERRα enables formation of ERRα/PGC1α/CREB/RNA Pol II transcriptional complex at the Ucp1 promoter following β3-adrenergic stimulation, inducing UCP1 expression and thermogenesis. Brown adipocyte-specific Senp2 KO mice show impaired cold-induced thermogenesis.","method":"Brown adipocyte-specific Senp2 KO mice, ChIP, SUMOylation assays, Ucp1 reporter assay, ERRE binding assay, β3-adrenergic stimulation experiments","journal":"Experimental & molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO mice, ChIP demonstrating transcription factor complex at promoter, DNA-binding assay showing SUMOylation blocks ERRE binding, multiple orthogonal methods","pmids":["40579429"],"is_preprint":false},{"year":2017,"finding":"ORC2 SUMOylation is reversibly controlled by SUMO E3 ligase PIAS4 and deSUMOylase SENP2 at the G2/M phase. Depletion of PIAS4 or overexpression of SENP2 eliminates ORC2 SUMOylation, causing abnormal centromeric H3K4 methylation and genome endoreduplication/polyploidy. ORC2-SUMO2 fusion protein expression reduces polyploidy in SENP2-overexpressing cells.","method":"Co-IP, overexpression/siRNA knockdown, centromeric H3K4me ChIP, ploidy analysis by flow cytometry, ORC2-SUMO2 fusion rescue","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct epistasis via rescue fusion protein, ChIP, ploidy readout, single lab","pmids":["29050267"],"is_preprint":false}],"current_model":"SENP2 is a dual-function SUMO-specific cysteine protease that (1) processes SUMO precursors into their mature conjugatable forms and (2) isopeptidase-cleaves SUMO-1/2/3 from modified substrates (with deconjugation kinetically preferred over processing, and Met497 governing isoform selectivity as defined by X-ray structures); it is dynamically tethered to the nuclear-face of nuclear pore complexes via N-terminal elements engaging Nup153, karyopherins, and the Nup107-160 subcomplex, and also binds intracellular membranes through an N-terminal amphipathic α-helix; it is regulated post-translationally by p90RSK-mediated T368 phosphorylation (causing nuclear export), CHK1-mediated S344 phosphorylation (promoting nuclear retention), CBP-mediated acetylation (inhibiting activity), LMP1-induced K48/K447 SUMOylation, and USP44-mediated deubiquitination (promoting stability); confirmed substrates include NEMO, IRF3, C/EBPβ, Smad4, MDC1, AMPKα, Akt, DRP1, Kv7.2/Kv7.3, SDHA, SERCA2a, NCOA4, ORC2, RanGAP1, ERRα, Setdb1, PLCβ4, MEF2A, myocardin, TGF-βRI, TBL1/TBLR1, NDR1, SMN, OAT3, and APP; through these substrates SENP2 controls NF-κB signaling, antiviral innate immunity, adipogenesis, thermogenesis, fatty acid oxidation, cardiac development, mitochondrial function, DNA damage repair, chromosome segregation, neuronal excitability, and nucleoporin homeostasis."},"narrative":{"mechanistic_narrative":"SENP2 is a SUMO-specific cysteine protease with dual catalytic functions: it matures SUMO-1/2/3 precursors and cleaves SUMO from conjugated substrates, with deconjugation kinetically favored over processing and Met497 acting as a determinant of SUMO isoform specificity, as defined by transition-state and substrate-complex crystal structures [PMID:15296745, PMID:17099700]. Its localization is highly regulated: N-terminal elements tether SENP2 to the nucleoplasmic face of the nuclear pore complex through direct binding to Nup153, karyopherin-mediated FG-nucleoporin engagement, and contacts with the Nup107-160 subcomplex, an arrangement that restricts which nuclear SUMO conjugates it can access [PMID:11896061, PMID:22031293, PMID:22688647]; an N-terminal amphipathic helix additionally directs SENP2 to ER, Golgi, and inner nuclear membranes, and the enzyme is also found in mitochondria [PMID:29874116, PMID:36708515]. At the pore SENP2 maintains nucleoporin homeostasis and is recruited to kinetochores in mitosis, where its dosage governs chromosome congression [PMID:24048451, PMID:24196834]. Through substrate deSUMOylation SENP2 controls a broad range of processes; recurring logic is that SUMOylation marks substrates for ubiquitin-dependent degradation or alters their localization/DNA binding, and SENP2 reverses this to stabilize or activate them — for example deSUMOylating and stabilizing C/EBPβ to drive adipogenesis and beige-fat programs [PMID:20194620, PMID:35196497], enabling ERRα DNA binding and UCP1-driven thermogenesis [PMID:40579429], promoting fatty-acid oxidation via PPARδ/γ [PMID:25784542], and clearing SUMO from MDC1 to favor NHEJ and radioresistance [PMID:30796017]. In innate immunity and NF-κB signaling it deSUMOylates NEMO, IRF3, and IκBα to tune genotoxic and antiviral responses [PMID:21777808, PMID:22028379, PMID:31964975]. SENP2 also regulates mitochondrial fission and metabolism through DRP1 and SDHA [PMID:35064188, PMID:36708515], neuronal excitability via Kv7.2/Kv7.3 channels [PMID:34509475], and stability of AMPKα, Akt, Smad4, and many other substrates [PMID:34971706, PMID:33687053, PMID:37301920]. Its own activity is set post-translationally by p90RSK-mediated T368 phosphorylation that drives nuclear export, CHK1-mediated S344 phosphorylation favoring retention, CBP acetylation that inhibits activity, and USP44-mediated deubiquitination that stabilizes the protein [PMID:25689261, PMID:37711550, PMID:36708515, PMID:41250203].","teleology":[{"year":2002,"claim":"Established that SENP2 is not a freely diffusible deSUMOylase but is spatially restricted, answering how a SUMO protease achieves substrate selectivity.","evidence":"Co-IP, in vivo localization, and N-terminal deletion mutants showing direct Nup153 binding at the NPC nucleoplasmic face","pmids":["11896061"],"confidence":"High","gaps":["Did not define the full set of pore-tethering interactions","Did not identify physiological substrates restricted by pore association"]},{"year":2004,"claim":"Defined the catalytic basis of SENP2 by capturing protease-SUMO interaction, answering how the enzyme recognizes and acts on SUMO.","evidence":"X-ray structure of a covalent thiohemiacetal transition-state complex with SUMO-1 plus in vitro maturation/deconjugation assays and Gly-Gly mutants","pmids":["15296745"],"confidence":"High","gaps":["Did not resolve kinetic preference between maturation and deconjugation","Isoform specificity determinants not yet mapped"]},{"year":2006,"claim":"Explained substrate-lysine positioning and SUMO isoform discrimination, answering why SENP2 prefers deconjugation and how it distinguishes SUMO paralogs.","evidence":"Multiple crystal structures of inactive SENP2 with RanGAP1-SUMO-1/2 and SUMO precursors, with Met497 mutagenesis and in vitro assays","pmids":["17099700"],"confidence":"High","gaps":["Structural basis does not explain cellular substrate selection","No structure of full-length enzyme with regulatory N-terminus"]},{"year":2011,"claim":"Resolved the dynamic, multivalent mechanism of NPC tethering and showed it limits substrate access, refining how localization regulates SENP2 activity.","evidence":"FRAP, domain-deletion mutants, and Co-IP with karyopherins and the Nup107-160 subcomplex","pmids":["22031293"],"confidence":"High","gaps":["Signals controlling release from the pore not fully defined","Quantitative substrate set gated by tethering unknown"]},{"year":2011,"claim":"Placed SENP2 in a genotoxic-stress negative-feedback loop, answering how SUMO dynamics on NEMO and IRF3 shape NF-κB and antiviral output.","evidence":"Co-IP, deSUMOylation assays, ChIP, and SENP2-null cells linking NEMO/IRF3 deSUMOylation to IKK/NF-κB and IFN-β responses","pmids":["21777808","22028379"],"confidence":"High","gaps":["Crosstalk with other SENPs in the same loop incompletely resolved","In vivo immune consequences not addressed in these studies"]},{"year":2010,"claim":"Connected SENP2 to a transcription-factor stabilization logic, answering how deSUMOylation controls cell differentiation.","evidence":"siRNA knockdown, ubiquitination assays, and C/EBPβ overexpression rescue in adipogenesis","pmids":["20194620"],"confidence":"High","gaps":["Whether SUMO-to-ubiquitin switch on C/EBPβ generalizes to other substrates not tested here","Upstream signals regulating SENP2 in adipocytes not defined"]},{"year":2018,"claim":"Expanded SENP2 localization beyond the pore to intracellular membranes, answering how the enzyme reaches non-nuclear compartments.","evidence":"In vitro membrane-binding assay, BioID interactome, amphipathic-helix mutants, and karyopherin-α regulation","pmids":["29874116"],"confidence":"High","gaps":["Membrane-associated substrates only partially identified","Functional role of membrane targeting incompletely defined"]},{"year":2019,"claim":"Showed SENP2 protects substrates from RNF4-VCP-mediated SUMO-targeted degradation to direct DNA repair pathway choice, linking deSUMOylation to radioresistance.","evidence":"SUMOylation assays, focus-retention imaging, NHEJ/HR reporters, and RNF4-VCP epistasis on MDC1","pmids":["30796017"],"confidence":"High","gaps":["Quantitative contribution to HR via free-SUMO provision not separated from direct MDC1 effect","Clinical relevance of 3q amplification in patients not established here"]},{"year":2021,"claim":"Established SENP2 as a regulator of mitochondrial dynamics, ion channels, and kinase stability, broadening its physiological reach to insulin secretion, neuronal excitability, and metabolism.","evidence":"Tissue-specific Senp2 knockout mice, SUMO/ubiquitination assays, electrophysiology, and rescue experiments across DRP1, Kv7.2/3, AMPKα, Akt, MEF2A, SMN, PLCβ4","pmids":["35064188","34509475","34971706","33687053","23224591","34628513","34465891"],"confidence":"High","gaps":["Substrate prioritization in a given tissue not resolved","Whether single substrate accounts for each phenotype not always isolated"]},{"year":2022,"claim":"Refined the adipose and vascular roles into defined regulatory axes, answering how SENP2 controls thermogenesis and smooth-muscle phenotype.","evidence":"Adipocyte-specific KO mice, Co-IP, ChIP for the C/EBPβ-DAXX-HOXC10 axis, and myocardin K573 site mutagenesis","pmids":["35196497","36293488"],"confidence":"High","gaps":["Tissue-specific substrate hierarchy not fully mapped","Some substrate links rest on single-lab evidence"]},{"year":2023,"claim":"Demonstrated mitochondrial and immune metabolic roles and identified acetylation as a brake on SENP2 activity, linking metabolic state to SUMO dynamics.","evidence":"Mitochondrial fractionation, in vitro deSUMOylation and acetylation assays for SDHA/CBP, and T cell-specific KO with Smad4 deSUMOylation in colitis","pmids":["36708515","37301920","37462038"],"confidence":"High","gaps":["How acetylation, phosphorylation, and SUMOylation of SENP2 are integrated remains unresolved","Mitochondrial import mechanism not defined"]},{"year":2025,"claim":"Identified post-translational stabilization and a non-canonical proteolytic activity, expanding both regulation and substrate scope of SENP2.","evidence":"USP44 deubiquitination (Co-IP/CHX chase), CHK1 S344 phospho knock-in mice, NCOA4-OTUB1 stability assays, and in vitro α-synuclein cleavage","pmids":["41250203","37711550","40366738","40028275"],"confidence":"Medium","gaps":["Non-SUMO proteolytic activity on α-synuclein rests on single-lab in vitro evidence","Integration of multiple PTM inputs on SENP2 activity not reconstituted"]},{"year":null,"claim":"How the dozens of identified SENP2 substrates are selected and prioritized within a given cell type, and how localization and the layered PTM code (phosphorylation, acetylation, SUMOylation, ubiquitination) are integrated to set activity, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of substrate selection across compartments","PTM crosstalk on SENP2 not reconstituted in vitro","Human disease links largely inferred from mouse models"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2,4,6,15,21,30,36]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[1,2,36]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,15,22,39]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[10]}],"localization":[{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[0,3,14]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[0,3]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[14]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[14]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[30]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[31]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,5,32]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[15]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[8,40]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[12,22,30,39]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,13,28,39]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[18,23,32]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,3,9]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[9,21]}],"complexes":["nuclear pore complex","kinetochore"],"partners":["NUP153","NEMO","IRF3","MDC1","DRP1","SMAD4","AMPKΑ","NCOA4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9HC62","full_name":"Sentrin-specific protease 2","aliases":["Axam2","SMT3-specific isopeptidase 2","Smt3ip2","Sentrin/SUMO-specific protease SENP2"],"length_aa":589,"mass_kda":67.9,"function":"Protease that catalyzes two essential functions in the SUMO pathway (PubMed:11896061, PubMed:12192048, PubMed:15296745, PubMed:20194620, PubMed:21965678). The first is the hydrolysis of an alpha-linked peptide bond at the C-terminal end of the small ubiquitin-like modifier (SUMO) propeptides, SUMO1, SUMO2 and SUMO3 leading to the mature form of the proteins (PubMed:15296745). The second is the deconjugation of SUMO1, SUMO2 and SUMO3 from targeted proteins, by cleaving an epsilon-linked peptide bond between the C-terminal glycine of the mature SUMO and the lysine epsilon-amino group of the target protein (PubMed:15296745, PubMed:20194620, PubMed:21965678). May down-regulate CTNNB1 levels and thereby modulate the Wnt pathway (By similarity). Deconjugates SUMO2 from MTA1 (PubMed:21965678). Plays a dynamic role in adipogenesis by desumoylating and promoting the stabilization of CEBPB (PubMed:20194620). Acts as a regulator of the cGAS-STING pathway by catalyzing desumoylation of CGAS and STING1 during the late phase of viral infection (By similarity)","subcellular_location":"Nucleus, nuclear pore complex; Nucleus membrane; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9HC62/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SENP2","classification":"Not Classified","n_dependent_lines":15,"n_total_lines":1208,"dependency_fraction":0.012417218543046357},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SENP2","total_profiled":1310},"omim":[{"mim_id":"615708","title":"ZINC FINGER PROTEIN 451; ZNF451","url":"https://www.omim.org/entry/615708"},{"mim_id":"612846","title":"SENTRIN-SPECIFIC PROTEASE FAMILY, MEMBER 7; SENP7","url":"https://www.omim.org/entry/612846"},{"mim_id":"612157","title":"SENTRIN-SPECIFIC PROTEASE FAMILY, MEMBER 1; SENP1","url":"https://www.omim.org/entry/612157"},{"mim_id":"608261","title":"SENTRIN-SPECIFIC PROTEASE FAMILY, MEMBER 2; SENP2","url":"https://www.omim.org/entry/608261"},{"mim_id":"602850","title":"RING FINGER PROTEIN 4; RNF4","url":"https://www.omim.org/entry/602850"}],"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/SENP2"},"hgnc":{"alias_symbol":["SMT3IP2","KIAA1331","DKFZp762A2316","AXAM2"],"prev_symbol":[]},"alphafold":{"accession":"Q9HC62","domains":[{"cath_id":"3.40.395.10","chopping":"369-586","consensus_level":"medium","plddt":97.2407,"start":369,"end":586}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HC62","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HC62-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HC62-F1-predicted_aligned_error_v6.png","plddt_mean":62.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SENP2","jax_strain_url":"https://www.jax.org/strain/search?query=SENP2"},"sequence":{"accession":"Q9HC62","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9HC62.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9HC62/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HC62"}},"corpus_meta":[{"pmid":"11896061","id":"PMC_11896061","title":"Association of the human SUMO-1 protease SENP2 with the nuclear pore.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11896061","citation_count":203,"is_preprint":false},{"pmid":"15296745","id":"PMC_15296745","title":"A basis for SUMO protease specificity provided by analysis of human Senp2 and a Senp2-SUMO complex.","date":"2004","source":"Structure (London, England : 1993)","url":"https://pubmed.ncbi.nlm.nih.gov/15296745","citation_count":167,"is_preprint":false},{"pmid":"17099700","id":"PMC_17099700","title":"Structural basis for SENP2 protease interactions with SUMO precursors and conjugated substrates.","date":"2006","source":"Nature structural & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/17099700","citation_count":123,"is_preprint":false},{"pmid":"25689261","id":"PMC_25689261","title":"Disturbed flow-activated p90RSK kinase accelerates atherosclerosis by inhibiting SENP2 function.","date":"2015","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/25689261","citation_count":76,"is_preprint":false},{"pmid":"22028379","id":"PMC_22028379","title":"SENP2 negatively regulates cellular antiviral response by deSUMOylating IRF3 and conditioning it for ubiquitination and degradation.","date":"2011","source":"Journal of molecular cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/22028379","citation_count":73,"is_preprint":false},{"pmid":"21777808","id":"PMC_21777808","title":"NF-κB induction of the SUMO protease SENP2: A negative feedback loop to attenuate cell survival response to genotoxic stress.","date":"2011","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/21777808","citation_count":69,"is_preprint":false},{"pmid":"20194620","id":"PMC_20194620","title":"Control of adipogenesis by the SUMO-specific protease SENP2.","date":"2010","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/20194620","citation_count":66,"is_preprint":false},{"pmid":"22155005","id":"PMC_22155005","title":"Enhanced desumoylation in murine hearts by overexpressed SENP2 leads to congenital heart defects and cardiac dysfunction.","date":"2011","source":"Journal of molecular and cellular cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/22155005","citation_count":62,"is_preprint":false},{"pmid":"25784542","id":"PMC_25784542","title":"SUMO-Specific Protease 2 (SENP2) Is an Important Regulator of Fatty Acid Metabolism in Skeletal Muscle.","date":"2015","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/25784542","citation_count":55,"is_preprint":false},{"pmid":"22031293","id":"PMC_22031293","title":"The SUMO-specific isopeptidase SENP2 associates dynamically with nuclear pore complexes through interactions with karyopherins and the Nup107-160 nucleoporin subcomplex.","date":"2011","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/22031293","citation_count":51,"is_preprint":false},{"pmid":"24048451","id":"PMC_24048451","title":"SENP1 and SENP2 affect spatial and temporal control of sumoylation in mitosis.","date":"2013","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/24048451","citation_count":46,"is_preprint":false},{"pmid":"30796017","id":"PMC_30796017","title":"The deSUMOylase SENP2 coordinates homologous recombination and nonhomologous end joining by independent mechanisms.","date":"2019","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/30796017","citation_count":46,"is_preprint":false},{"pmid":"29272473","id":"PMC_29272473","title":"Senp2 regulates adipose lipid storage by de-SUMOylation of Setdb1.","date":"2018","source":"Journal of molecular cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/29272473","citation_count":46,"is_preprint":false},{"pmid":"23098437","id":"PMC_23098437","title":"SENP2 regulates hepatocellular carcinoma cell growth by modulating the stability of β-catenin.","date":"2012","source":"Asian Pacific journal of cancer prevention : APJCP","url":"https://pubmed.ncbi.nlm.nih.gov/23098437","citation_count":38,"is_preprint":false},{"pmid":"22688647","id":"PMC_22688647","title":"Two distinct sites in Nup153 mediate interaction with the SUMO proteases SENP1 and SENP2.","date":"2012","source":"Nucleus (Austin, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/22688647","citation_count":38,"is_preprint":false},{"pmid":"26369384","id":"PMC_26369384","title":"SENP2 regulates MMP13 expression in a bladder cancer cell line through SUMOylation of TBL1/TBLR1.","date":"2015","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/26369384","citation_count":34,"is_preprint":false},{"pmid":"24422630","id":"PMC_24422630","title":"Transcriptional repression of estrogen receptor α signaling by SENP2 in breast cancer cells.","date":"2013","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/24422630","citation_count":30,"is_preprint":false},{"pmid":"24969559","id":"PMC_24969559","title":"SENP2 regulated the stability of β-catenin through WWOX in hepatocellular carcinoma cell.","date":"2014","source":"Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/24969559","citation_count":29,"is_preprint":false},{"pmid":"36708515","id":"PMC_36708515","title":"Mitochondrial SENP2 regulates the assembly of SDH complex under metabolic stress.","date":"2023","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/36708515","citation_count":28,"is_preprint":false},{"pmid":"28574613","id":"PMC_28574613","title":"SENP2 suppresses epithelial-mesenchymal transition of bladder cancer cells through deSUMOylation of TGF-βRI.","date":"2017","source":"Molecular carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/28574613","citation_count":27,"is_preprint":false},{"pmid":"35064188","id":"PMC_35064188","title":"SENP2 regulates mitochondrial function and insulin secretion in pancreatic β cells.","date":"2022","source":"Experimental & molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35064188","citation_count":25,"is_preprint":false},{"pmid":"24196834","id":"PMC_24196834","title":"The SUMO proteases SENP1 and SENP2 play a critical role in nucleoporin homeostasis and nuclear pore complex function.","date":"2013","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/24196834","citation_count":25,"is_preprint":false},{"pmid":"31964975","id":"PMC_31964975","title":"Silencing of SENP2 in Multiple Myeloma Induces Bortezomib Resistance by Activating NF-κB Through the Modulation of IκBα Sumoylation.","date":"2020","source":"Scientific 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N-terminal domain, which directly binds Nup153, a nucleoporin on the nucleoplasmic face of the pore. Removal of the Nup153-interacting region alters the spectrum of SUMO-1 conjugates within the cell, suggesting NPC association restricts SENP2 activity to a subset of nuclear SUMOylated proteins.\",\n      \"method\": \"Co-immunoprecipitation, in vivo localization, N-terminal deletion mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding demonstrated with domain-mapping, functional consequence of disruption shown, replicated by multiple subsequent studies\",\n      \"pmids\": [\"11896061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"X-ray crystal structures of human SENP2 catalytic domain alone and as a covalent thiohemiacetal transition-state complex with SUMO-1 revealed the protease and substrate surfaces mediating interaction. SENP2 processes SUMO-1, SUMO-2, and SUMO-3 precursors (maturation) and deconjugates them from substrates, with activity dependent on residues C-terminal to the conserved Gly-Gly motif of SUMO.\",\n      \"method\": \"X-ray crystallography, in vitro biochemical maturation and deconjugation assays, SUMO tail-swap and Gly-Gly insertion mutants\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure of transition-state complex with mutagenesis and in vitro biochemical validation in one rigorous study\",\n      \"pmids\": [\"15296745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structures of catalytically inert SENP2 protease domain complexed with RanGAP1-SUMO-1, RanGAP1-SUMO-2, SUMO-2 precursor, and SUMO-3 precursor revealed a 90° kink near the scissile bond that directs the substrate lysine toward a protease surface optimized for lysine deconjugation. SENP2 residue Met497 was identified as a key determinant of SUMO isoform specificity; SENP2 catalyzes deconjugation more efficiently than processing.\",\n      \"method\": \"X-ray crystallography (multiple complex structures), mutagenesis, in vitro deconjugation/processing assays\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple crystal structures, active-site mutagenesis, and in vitro biochemical validation in one rigorous study\",\n      \"pmids\": [\"17099700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SENP2 dynamically associates with NPCs via multiple N-terminal elements: (1) a nuclear localization signal that tethers SENP2 to FG-repeat nucleoporins through karyopherins, (2) a domain that directly contacts the Nup107-160 subcomplex, and (3) a nuclear export signal. Disruption of these interactions increases SENP2 substrate accessibility in cells.\",\n      \"method\": \"FRAP (fluorescence recovery after photobleaching), domain-deletion mutants, Co-IP with karyopherins and Nup107-160 subcomplex, in vivo localization\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — FRAP, co-IP, domain mapping with functional consequence, multiple orthogonal methods in one study\",\n      \"pmids\": [\"22031293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SENP2 is the primary SUMO protease that associates with NEMO, deSUMOylates NEMO, and inhibits DNA damage-induced NF-κB activation. NF-κB transcriptionally induces SENP2 (and SENP1) in response to genotoxic stimuli via ATM-dependent histone methylation at SENP2 promoter κB regions, creating a negative feedback loop. SENP2-null cells show biphasic NEMO SUMOylation, sustained IKK/NF-κB activation, and higher resistance to DNA damage-induced cell death.\",\n      \"method\": \"Co-IP, deSUMOylation assay, SENP2-null cells, overexpression/knockdown, chromatin immunoprecipitation, promoter analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, ChIP, null cells, functional rescue), clear epistatic pathway placement\",\n      \"pmids\": [\"21777808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SENP2 deSUMOylates IRF3, which then undergoes K48-linked ubiquitination at the same sites (K70 and K87) used for SUMOylation, leading to proteasomal degradation. SUMOylation and K48-ubiquitination of IRF3 are competitive at these lysines. SENP2-deficient cells have elevated IRF3 SUMOylation, reduced ubiquitination/degradation, higher IFN-β production, and reduced viral replication.\",\n      \"method\": \"Overexpression, siRNA knockdown, site-directed mutagenesis (K70R/K87R), ubiquitination assays, SENP2-deficient cells\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (mutagenesis, ubiquitination assays, KD/KO with defined molecular and functional phenotypes)\",\n      \"pmids\": [\"22028379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SENP2 is required for adipogenesis by deSUMOylating and stabilizing C/EBPβ. SUMOylation of C/EBPβ promotes its ubiquitination and proteasomal degradation; SENP2 reverses this. SENP2 knockdown prevents adipocyte differentiation by reducing C/EBPβ protein levels (without affecting mRNA), leading to decreased PPARγ and C/EBPα expression. Overexpression of C/EBPβ rescues the SENP2-knockdown adipogenesis defect.\",\n      \"method\": \"siRNA knockdown, overexpression, in vivo preadipocyte implantation, ubiquitination assays, rescue experiments\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockdown with specific phenotype, genetic rescue, ubiquitination assay, in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"20194620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Two distinct sites in Nup153 bind SENP2 and SENP1: the unique N-terminal domain and a specific region within the C-terminal FG-rich region of Nup153. Nup153 itself is a substrate for SUMOylation, and depletion of SENP1/SENP2 by RNAi or expression of dominant-negative mutants increases endogenous Nup153 SUMOylation. Unlike SENP1, SENP2 levels are not affected by changes in Nup153 abundance.\",\n      \"method\": \"Co-IP, RNAi, dominant-negative mutants, SUMOylation assays\",\n      \"journal\": \"Nucleus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with domain mapping and functional consequence, single lab\",\n      \"pmids\": [\"22688647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SENP1 and SENP2 are targeted to kinetochores during mitosis. SENP2 kinetochore targeting requires the Nup107-160 NPC subcomplex and is modulated by karyopherin α interactions. Overexpression of SENP2 (but not other SUMO isopeptidases) causes chromosome congression defects dependent on precise kinetochore targeting. RNAi knockdown of SENP1 (but not SENP2) delays sister chromatid separation at metaphase.\",\n      \"method\": \"Live-cell imaging, siRNA knockdown, overexpression, kinetochore targeting assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization imaging with functional phenotype, domain-specific targeting requirements established, multiple SENP family members tested as controls\",\n      \"pmids\": [\"24048451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SENP1 and SENP2 co-depletion causes mislocalization of many nucleoporins and in some cases reduces their levels, revealing a role for pore-associated SENPs in nucleoporin homeostasis and proper NPC configuration. Remaining NPCs retain transport capability but with altered kinetics.\",\n      \"method\": \"RNAi co-depletion, immunofluorescence, transport assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization and functional transport assays after co-depletion, single lab\",\n      \"pmids\": [\"24196834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SENP2 interacts with ERα via its N-terminal region (binding the hinge region of ERα) and represses ERα-mediated transcription independently of its SUMO protease activity through a transcriptional repressive domain in its N-terminus. This domain recruits HDAC3 to be fully active. SENP2 also represses estrogen-dependent and independent proliferation of MCF7 cells, requiring both its proteolytic and transcriptional repressive activities.\",\n      \"method\": \"GST pulldown, Co-IP, proximity ligation assay, reporter assays, siRNA, chromatin immunoprecipitation, deletion mutants\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays plus functional domain dissection, single lab\",\n      \"pmids\": [\"24422630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Disturbed flow activates p90RSK, which phosphorylates SENP2 at threonine 368 (T368). T368 phosphorylation promotes nuclear export of SENP2, leading to decreased eNOS expression and increased pro-inflammatory adhesion molecule expression and apoptosis. In an atherosclerosis mouse model, EC-specific DN-p90RSK is protective, and SENP2 depletion abolishes this protective effect.\",\n      \"method\": \"In vivo kinase assay, phospho-mutant overexpression, nuclear fractionation, LDLR-deficient mouse model, EC-specific transgenic overexpression\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo kinase phosphorylation with specific site identified, nuclear export demonstrated by fractionation, epistasis confirmed in vivo with double-transgenic mice\",\n      \"pmids\": [\"25689261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SENP2 promotes fatty acid oxidation in skeletal muscle by deSUMOylating PPARδ and PPARγ, which enhances their recruitment to promoters of FAO genes (CPT1b and ACSL1). Palmitate treatment induces NF-κB-mediated SENP2 upregulation. Muscle-specific SENP2 overexpression in mice increases FAO and alleviates high-fat diet-induced obesity and insulin resistance.\",\n      \"method\": \"ChIP, overexpression in myotubes, muscle-specific transgenic mice, FAO assays, siRNA\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating promoter recruitment, in vitro and in vivo validation, specific molecular mechanism identified\",\n      \"pmids\": [\"25784542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SENP2 deSUMOylates SET domain bifurcated 1 (Setdb1). SUMOylation of Setdb1 promotes its occupancy at the Pparg and Cebpa gene promoters and suppresses their expression via H3K9me3 histone methylation. Adipocyte-specific Senp2 deficiency leads to accumulation of SUMOylated Setdb1, reduced Pparg/Cebpa expression, and decreased adipose lipid storage.\",\n      \"method\": \"Co-IP, ChIP, adipocyte-specific Senp2 knockout mice, SUMOylation assays\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, ChIP, in vivo knockout with specific molecular mechanism linking deSUMOylation to epigenetic regulation\",\n      \"pmids\": [\"29272473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SENP2 is targeted to intracellular membranes (ER, Golgi, inner nuclear membrane) via a predicted N-terminal amphipathic α-helix that directly binds membranes in vitro. Karyopherin-α binding to SENP2 regulates this membrane association. BioID proximity labeling confirmed interactions with ER, Golgi, and inner nuclear membrane-associated proteins.\",\n      \"method\": \"In vivo localization, in vitro membrane binding assay, BioID, karyopherin-α interaction studies, amphipathic helix mutants\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro direct membrane binding assay, in vivo localization, and BioID interactome in one study\",\n      \"pmids\": [\"29874116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SENP2 deSUMOylates MDC1 to prevent its excessive SUMOylation and subsequent RNF4-VCP-mediated clearance from DSBs, thereby promoting NHEJ. In homologous recombination (HR), SENP2 activity provides free SUMO. Increased SENP2 expression (as in chromosome 3q amplification) prolongs MDC1 focus retention, increases NHEJ efficiency, and promotes radioresistance.\",\n      \"method\": \"SUMOylation assays, focus retention imaging, NHEJ/HR reporter assays, SENP2 overexpression/knockdown, RNF4-VCP epistasis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple repair pathway reporter assays, substrate identification, epistasis with RNF4-VCP, multiple orthogonal methods\",\n      \"pmids\": [\"30796017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"EBV oncoprotein LMP1 increases SUMOylation of SENP2 at K48 and K447 in a CTAR-dependent manner, decreases SENP2 activity, inhibits SENP2 ubiquitination, reduces SENP2 turnover, and alters SENP2 localization. Inhibition of ubiquitination alone is sufficient to mimic LMP1-induced changes in SENP2 activity and trafficking.\",\n      \"method\": \"SUMO modification assays, ubiquitination assays, localization imaging, LMP1 mutant analysis, site-directed mutagenesis (K48/K447)\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple PTM assays and localization data in one study, single lab\",\n      \"pmids\": [\"31266997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SENP2 deSUMOylates TBL1/TBLR1, which prevents formation of complexes with β-catenin that facilitate β-catenin nuclear translocation. Through this mechanism, SENP2 suppresses MMP13 expression and inhibits bladder cancer cell migration and invasion.\",\n      \"method\": \"Co-IP, β-catenin nuclear fractionation, overexpression/knockdown, SUMOylation assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP with nuclear fractionation, mechanistic pathway placed, single lab\",\n      \"pmids\": [\"26369384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SENP2 deSUMOylates TGF-β receptor I (TGF-βRI), thereby suppressing TGF-β signaling and TGF-β-induced epithelial-mesenchymal transition in bladder cancer cells.\",\n      \"method\": \"Co-IP, SUMOylation assays, overexpression/knockdown, in vivo tumor metastasis model\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and SUMOylation assay identifying specific substrate, in vivo validation, single lab\",\n      \"pmids\": [\"28574613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SENP2 co-immunoprecipitates with and directly deSUMOylates OAT3 in rat kidney; SENP2 overexpression reduces OAT3 SUMOylation, expression, and transport activity in COS-7 cells, while SENP2 knockdown has opposite effects. A catalytic mutant of SENP2 does not affect OAT3.\",\n      \"method\": \"Co-IP from rat kidney, overexpression, siRNA knockdown, catalytic mutant, transport activity assay\",\n      \"journal\": \"Biochimica et biophysica acta. Biomembranes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct Co-IP from tissue, catalytic mutant control, transport functional readout, single lab\",\n      \"pmids\": [\"31054272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SENP2 silencing in multiple myeloma cells increases SUMO2-conjugated IκBα, leading to NF-κB activation and bortezomib resistance. SENP2 overexpression sensitizes cells to bortezomib by promoting IκBα deSUMOylation and suppressing NF-κB.\",\n      \"method\": \"siRNA knockdown, overexpression, SUMO2 conjugation assays (Co-IP), NF-κB reporter assay, drug sensitivity assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for SUMOylated IκBα, overexpression and knockdown with functional drug resistance readout, single lab\",\n      \"pmids\": [\"31964975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SENP2 deSUMOylates DRP1 (a mitochondrial fission protein); SENP2 deficiency in pancreatic β cells increases SUMO2/3 conjugation to DRP1, suppresses DRP1 S616 phosphorylation, induces mitochondrial elongation and dysfunction, and impairs glucose-stimulated insulin secretion. SENP2 overexpression restores GSIS impairment caused by DRP1 knockdown.\",\n      \"method\": \"β cell-specific Senp2 knockout mice, SUMO conjugation assays, phospho-DRP1 Western blot, mitochondrial morphology imaging, GSIS assays, rescue overexpression\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO mouse model, molecular mechanism linking deSUMOylation to DRP1 phosphorylation and mitochondrial function, functional rescue\",\n      \"pmids\": [\"35064188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SENP2 deSUMOylates AMPKα, promoting its ubiquitination and proteasomal degradation, thereby reducing AMPKα protein stability. Loss of hepatic SENP2 increases AMPKα stability, reduces gluconeogenesis, and protects against high-fat diet-induced hyperglycemia. AMPKα kinase inhibition reverses the effect of SENP2 deficiency on gluconeogenesis.\",\n      \"method\": \"Hepatic SENP2 knockout mice, Co-IP, in vitro deSUMOylation assay, ubiquitination assay, epistasis with AMPKα inhibitor, liver-specific adenoviral overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — liver-specific KO, in vitro deSUMOylation assay, ubiquitination assay, epistatic rescue with AMPKα inhibitor\",\n      \"pmids\": [\"34971706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SENP2 deSUMOylates Akt; SENP2 deficiency increases Akt SUMOylation and kinase activity, decreases GSK3β levels, and promotes cardiomyocyte proliferation and angiogenesis, improving cardiac function after myocardial infarction. SENP2 expression increases during postnatal heart development.\",\n      \"method\": \"SENP2-deficient mice and cells, SUMOylation assays, Akt kinase assay, cardiomyocyte proliferation and MI model\",\n      \"journal\": \"Clinical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SUMOylation assay for specific substrate, kinase activity assay, in vivo cardiac phenotype, single lab\",\n      \"pmids\": [\"33687053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SENP2 deSUMOylates MEF2A; SENP2 is the major de-SUMOylation enzyme for MEF2A identified by an unbiased shRNA screen. SUMOylated MEF2A accumulates in SENP2-knockdown cells and SENP2-knockout embryos. SENP2 enhances MEF2A transcriptional activity directly via deSUMOylation, and SENP2 protein accumulates in response to activity-dependent stimuli to mediate activity-dependent MEF2A deSUMOylation.\",\n      \"method\": \"shRNA screen, in vivo SUMOylation assays, SENP2-knockout embryos, overexpression, activity-dependent stimulation\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — unbiased screen plus in vivo knockout validation of substrate, single lab\",\n      \"pmids\": [\"23224591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SENP2 deficiency in neurons leads to hyper-SUMOylation of Kv7.2 and Kv7.3 potassium channel subunits. Hyper-SUMOylated Kv7.2/Kv7.3 show reduced PIP2 binding and decreased interaction with CaM1, impairing CaM1-mediated channel assembly. Mutation of Kv7.2/Kv7.3 SUMOylation sites decreases CaM1 binding and enhances channel assembly. SENP2-deficient mice develop spontaneous seizures due to reduced M-currents, and also display elevated acetylcholine/increased vagal tone causing cardiac arrhythmias.\",\n      \"method\": \"SENP2-deficient mice, SUMOylation site mutagenesis, PIP2 binding assay, CaM1 Co-IP, electrophysiology (M-current recording), pharmacological rescue (atropine, vagotomy, retigabine)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mice with defined electrophysiological phenotype, mutagenesis of SUMOylation sites, multiple binding assays, pharmacological rescue in vivo\",\n      \"pmids\": [\"34509475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SENP2 deficiency causes hyper-SUMOylation of SMN protein (modified by SUMO2 with E3 ligase PIAS2α). SUMOylated SMN undergoes ubiquitin-proteasome degradation via UBA1 and E3 ligase ITCH. SUMOylation also increases SMN acetylation and inhibits Cajal body formation. SENP2-deficient mice develop SMA-like pathology with decreased muscle fibers and motor neurons.\",\n      \"method\": \"SENP2-deficient mouse model, SUMO assays, ubiquitination assays, co-IP, E3 ligase identification, Cajal body imaging\",\n      \"journal\": \"Journal of molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with SMA phenotype, E3 ligase identified, ubiquitin-proteasome pathway established, multiple orthogonal methods\",\n      \"pmids\": [\"34628513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SENP2 deSUMOylates PLCβ4, preventing SUMO-dependent ubiquitin-mediated degradation catalyzed by PIAS2α and RNF4. SUMOylated PLCβ4 is transported to the nucleus via Nup205- and RanBP2-dependent pathways. SENP2-deficient mice show decreased PLCβ4, reduced IP3 formation, dysregulated intracellular calcium homeostasis, and defects in neurogenesis.\",\n      \"method\": \"Co-IP, SUMOylation assays, SENP2-deficient mice, calcium imaging, nuclear import assays, neurogenesis assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, SUMO-ubiquitin pathway established, in vivo KO with neurogenesis phenotype, mechanistic pathway placement\",\n      \"pmids\": [\"34465891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SENP2 deSUMOylates C/EBPβ; sumoylated C/EBPβ recruits the transcriptional repressor DAXX to suppress HOXC10 (a browning inhibitor) expression. Adipocyte-specific Senp2 knockout (Senp2-aKO) mice are resistant to diet-induced obesity due to increased thermogenic gene expression and beige adipocyte accumulation. SENP2 thus operates in a SENP2-C/EBPβ-HOXC10 axis that controls beige adipogenesis.\",\n      \"method\": \"Adipocyte-specific Senp2 KO mice, SUMOylation assays, Co-IP (DAXX recruitment), ChIP, energy expenditure measurements\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO mouse with metabolic phenotype, Co-IP, ChIP, molecular mechanism dissected with substrate and downstream effectors\",\n      \"pmids\": [\"35196497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SENP2 promotes phenotypic switching of vascular smooth muscle cells by deSUMOylating myocardin at K573 (modified by SUMO-1 via E3 ligase PIAS4). SUMO-1 modification stabilizes myocardin, whereas SENP2-mediated deSUMOylation facilitates proteasome-dependent myocardin degradation.\",\n      \"method\": \"Co-IP, SUMOylation site mutagenesis (K573), overexpression, proteasome inhibitor assays, PIAS4 ligase identification, smooth muscle cell phenotype assays\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis, E3 ligase identified, functional VSMC phenotype, single lab\",\n      \"pmids\": [\"36293488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SENP2 is present in mitochondria where it deSUMOylates SDHA (SUMOylated by PIAS3). SUMOylation of SDHA controls assembly and activity of the SDH complex. CBP acetyltransferase acetylates SENP2, negatively regulating its deSUMOylation activity. Under glutamine deprivation, decreased CBP levels activate SENP2, leading to SDHA deSUMOylation, dampened TCA cycle/ETC activity, and succinate accumulation to limit ROS and promote cancer cell survival.\",\n      \"method\": \"Co-IP, mitochondrial fractionation, in vitro deSUMOylation assay, acetylation assay, PIAS3 ligase identification, SDH activity assay, glutamine deprivation experiments\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mitochondrial localization established, in vitro activity assay, E3 ligase and acetyltransferase identified, pathway mechanism established with multiple orthogonal methods\",\n      \"pmids\": [\"36708515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SENP2 deSUMOylates SERCA2a; during myocardial ischemia/reperfusion injury (I/RI), SENP2 expression increases in the cytoplasm and promotes SERCA2a deSUMOylation, leading to calcium overload in cardiomyocytes. Inhibition of SENP2 (but not SENP1) reverses the I/RI-induced decline of SERCA2a SUMOylation, reduces infarct area, and improves cardiac function.\",\n      \"method\": \"Adenoviral overexpression/suppression, immunoprecipitation for SERCA2a SUMOylation, echocardiography, infarct staining, subcellular fractionation\",\n      \"journal\": \"Chinese medical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct measurement of substrate SUMOylation with functional cardiac phenotype, single lab\",\n      \"pmids\": [\"37462038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SENP2 deSUMOylates Smad4, reducing its nuclear entry and suppressing Rorc expression, thereby restraining pathogenic Th17 differentiation. T cell-specific Senp2 deletion exacerbates experimental colitis with elevated GM-CSF+IL-17A+ pathogenic Th17 cells. Adoptive transfer experiments confirmed cell-autonomous function of SENP2 in Th17 restraint.\",\n      \"method\": \"T cell-specific Senp2 knockout mice, SUMOylation assay for Smad4, nuclear fractionation, adoptive transfer, colitis model\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO, substrate (Smad4) deSUMOylation with nuclear entry consequence, adoptive transfer for cell-autonomous confirmation\",\n      \"pmids\": [\"37301920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SENP2 is required for SUMO2/SUMO3 regulation of placentation. SENP2 loss causes placental deficiencies linked to SUMO2/3 hyper-modification; reducing SUMO2 or SUMO3 gene dosage alleviates placental defects in SENP2 knockout mice, establishing genetic interaction between SENP2 and SUMO2/3 for trophoblast development.\",\n      \"method\": \"Genetic epistasis (SENP2 KO × SUMO2 or SUMO3 heterozygous mouse crosses), histology, embryonic phenotype analysis\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in vivo with phenotypic rescue, single lab\",\n      \"pmids\": [\"31625212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SENP2 deSUMOylates NDR1 (STK38) at K465; SUMOylation of NDR1 attenuates its inhibition of p38/ERK1/2 activation by decreasing NDR1 association with MEK kinase 1/2. Low-level laser irradiation increases NDR1 SUMOylation by downregulating SENP2, leading to faster keratinocyte migration.\",\n      \"method\": \"Co-IP, SUMOylation site mutagenesis (K465), kinase activity assays, SENP2 overexpression/knockdown, keratinocyte migration assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis, Co-IP, kinase pathway placement, functional migration readout, single lab\",\n      \"pmids\": [\"29969578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SENP2 deSUMOylates NCOA4 at SUMO1 sites K81, K343, and K600. SUMOylation enhances NCOA4 stability via interaction with the deubiquitinase OTUB1 (which directly deubiquitinates NCOA4). SENP2-mediated deSUMOylation disrupts NCOA4-OTUB1 interaction, reduces NCOA4 stability, and alleviates ferritinophagy-dependent ferroptosis in cardiomyocytes after MI/R injury.\",\n      \"method\": \"Co-IP, SUMOylation site mutagenesis (K81/K343/K600), NCOA4 stability assays, SENP2 overexpression/deletion, in vivo MI/R model\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis, Co-IP establishing NCOA4-OTUB1 interaction, in vivo MI/R model, single lab\",\n      \"pmids\": [\"40366738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SENP2 cleaves α-synuclein at its N-terminus (non-canonical proteolytic activity distinct from SUMO deconjugation). N-terminally truncated αSyn seeds released from pathological neurons promote SDS-resistant high-molecular oligomer formation in vitro. SENP2 inhibition suppresses αSyn aggregate formation and propagation in cultured neurons and mouse brains.\",\n      \"method\": \"In vitro protease assay with recombinant αSyn, oligomerization assay, SENP2 inhibition in neuronal models and in vivo mouse brain\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro direct proteolytic assay with recombinant substrate, in vivo inhibition with aggregate phenotype, single lab, novel non-SUMO substrate claim\",\n      \"pmids\": [\"40028275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CHK1 kinase phosphorylates SENP2 at S344 under laminar flow conditions. S344 phosphorylation inhibits ERK5 and p53 SUMOylation, suppressing endothelial cell activation. A SENP2 S344A knock-in mutation (generated by CRISPR/Cas9) in mice increases EC inflammation, migration, proliferation, apoptosis, and fibrotic changes.\",\n      \"method\": \"Phospho-specific antibody generation, CRISPR/Cas9 knock-in mice (S344A), kinase assays, CHK1 inhibitor experiments\",\n      \"journal\": \"Frontiers in cardiovascular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR knock-in phospho-site mutation with in vivo phenotype and kinase identified, single lab\",\n      \"pmids\": [\"37711550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP44 deubiquitinase interacts with SENP2 and stabilizes it through deubiquitination, as shown by Co-IP and cycloheximide chase assays. Knockdown of SENP2 reduces the inhibitory effect of USP44 on ESCC cell migration and invasion.\",\n      \"method\": \"Co-IP, LC-MS, cycloheximide chase, ubiquitination analysis, siSENP2 epistasis\",\n      \"journal\": \"Clinical epigenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and CHX chase demonstrating deubiquitination-mediated SENP2 stabilization, epistasis in functional assay, single lab\",\n      \"pmids\": [\"41250203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2029,\n      \"finding\": \"SENP2 deSUMOylates ERRα; sumoylated ERRα cannot bind its DNA-binding site (ERRE) in the Ucp1 promoter. SENP2-mediated deSUMOylation of ERRα enables formation of ERRα/PGC1α/CREB/RNA Pol II transcriptional complex at the Ucp1 promoter following β3-adrenergic stimulation, inducing UCP1 expression and thermogenesis. Brown adipocyte-specific Senp2 KO mice show impaired cold-induced thermogenesis.\",\n      \"method\": \"Brown adipocyte-specific Senp2 KO mice, ChIP, SUMOylation assays, Ucp1 reporter assay, ERRE binding assay, β3-adrenergic stimulation experiments\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO mice, ChIP demonstrating transcription factor complex at promoter, DNA-binding assay showing SUMOylation blocks ERRE binding, multiple orthogonal methods\",\n      \"pmids\": [\"40579429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ORC2 SUMOylation is reversibly controlled by SUMO E3 ligase PIAS4 and deSUMOylase SENP2 at the G2/M phase. Depletion of PIAS4 or overexpression of SENP2 eliminates ORC2 SUMOylation, causing abnormal centromeric H3K4 methylation and genome endoreduplication/polyploidy. ORC2-SUMO2 fusion protein expression reduces polyploidy in SENP2-overexpressing cells.\",\n      \"method\": \"Co-IP, overexpression/siRNA knockdown, centromeric H3K4me ChIP, ploidy analysis by flow cytometry, ORC2-SUMO2 fusion rescue\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct epistasis via rescue fusion protein, ChIP, ploidy readout, single lab\",\n      \"pmids\": [\"29050267\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SENP2 is a dual-function SUMO-specific cysteine protease that (1) processes SUMO precursors into their mature conjugatable forms and (2) isopeptidase-cleaves SUMO-1/2/3 from modified substrates (with deconjugation kinetically preferred over processing, and Met497 governing isoform selectivity as defined by X-ray structures); it is dynamically tethered to the nuclear-face of nuclear pore complexes via N-terminal elements engaging Nup153, karyopherins, and the Nup107-160 subcomplex, and also binds intracellular membranes through an N-terminal amphipathic α-helix; it is regulated post-translationally by p90RSK-mediated T368 phosphorylation (causing nuclear export), CHK1-mediated S344 phosphorylation (promoting nuclear retention), CBP-mediated acetylation (inhibiting activity), LMP1-induced K48/K447 SUMOylation, and USP44-mediated deubiquitination (promoting stability); confirmed substrates include NEMO, IRF3, C/EBPβ, Smad4, MDC1, AMPKα, Akt, DRP1, Kv7.2/Kv7.3, SDHA, SERCA2a, NCOA4, ORC2, RanGAP1, ERRα, Setdb1, PLCβ4, MEF2A, myocardin, TGF-βRI, TBL1/TBLR1, NDR1, SMN, OAT3, and APP; through these substrates SENP2 controls NF-κB signaling, antiviral innate immunity, adipogenesis, thermogenesis, fatty acid oxidation, cardiac development, mitochondrial function, DNA damage repair, chromosome segregation, neuronal excitability, and nucleoporin homeostasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SENP2 is a SUMO-specific cysteine protease with dual catalytic functions: it matures SUMO-1/2/3 precursors and cleaves SUMO from conjugated substrates, with deconjugation kinetically favored over processing and Met497 acting as a determinant of SUMO isoform specificity, as defined by transition-state and substrate-complex crystal structures [#1, #2]. Its localization is highly regulated: N-terminal elements tether SENP2 to the nucleoplasmic face of the nuclear pore complex through direct binding to Nup153, karyopherin-mediated FG-nucleoporin engagement, and contacts with the Nup107-160 subcomplex, an arrangement that restricts which nuclear SUMO conjugates it can access [#0, #3, #7]; an N-terminal amphipathic helix additionally directs SENP2 to ER, Golgi, and inner nuclear membranes, and the enzyme is also found in mitochondria [#14, #30]. At the pore SENP2 maintains nucleoporin homeostasis and is recruited to kinetochores in mitosis, where its dosage governs chromosome congression [#8, #9]. Through substrate deSUMOylation SENP2 controls a broad range of processes; recurring logic is that SUMOylation marks substrates for ubiquitin-dependent degradation or alters their localization/DNA binding, and SENP2 reverses this to stabilize or activate them — for example deSUMOylating and stabilizing C/EBP\\u03b2 to drive adipogenesis and beige-fat programs [#6, #28], enabling ERR\\u03b1 DNA binding and UCP1-driven thermogenesis [#39], promoting fatty-acid oxidation via PPAR\\u03b4/\\u03b3 [#12], and clearing SUMO from MDC1 to favor NHEJ and radioresistance [#15]. In innate immunity and NF-\\u03baB signaling it deSUMOylates NEMO, IRF3, and I\\u03baB\\u03b1 to tune genotoxic and antiviral responses [#4, #5, #20]. SENP2 also regulates mitochondrial fission and metabolism through DRP1 and SDHA [#21, #30], neuronal excitability via Kv7.2/Kv7.3 channels [#25], and stability of AMPK\\u03b1, Akt, Smad4, and many other substrates [#22, #23, #32]. Its own activity is set post-translationally by p90RSK-mediated T368 phosphorylation that drives nuclear export, CHK1-mediated S344 phosphorylation favoring retention, CBP acetylation that inhibits activity, and USP44-mediated deubiquitination that stabilizes the protein [#11, #37, #30, #38].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established that SENP2 is not a freely diffusible deSUMOylase but is spatially restricted, answering how a SUMO protease achieves substrate selectivity.\",\n      \"evidence\": \"Co-IP, in vivo localization, and N-terminal deletion mutants showing direct Nup153 binding at the NPC nucleoplasmic face\",\n      \"pmids\": [\"11896061\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the full set of pore-tethering interactions\", \"Did not identify physiological substrates restricted by pore association\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the catalytic basis of SENP2 by capturing protease-SUMO interaction, answering how the enzyme recognizes and acts on SUMO.\",\n      \"evidence\": \"X-ray structure of a covalent thiohemiacetal transition-state complex with SUMO-1 plus in vitro maturation/deconjugation assays and Gly-Gly mutants\",\n      \"pmids\": [\"15296745\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve kinetic preference between maturation and deconjugation\", \"Isoform specificity determinants not yet mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Explained substrate-lysine positioning and SUMO isoform discrimination, answering why SENP2 prefers deconjugation and how it distinguishes SUMO paralogs.\",\n      \"evidence\": \"Multiple crystal structures of inactive SENP2 with RanGAP1-SUMO-1/2 and SUMO precursors, with Met497 mutagenesis and in vitro assays\",\n      \"pmids\": [\"17099700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis does not explain cellular substrate selection\", \"No structure of full-length enzyme with regulatory N-terminus\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Resolved the dynamic, multivalent mechanism of NPC tethering and showed it limits substrate access, refining how localization regulates SENP2 activity.\",\n      \"evidence\": \"FRAP, domain-deletion mutants, and Co-IP with karyopherins and the Nup107-160 subcomplex\",\n      \"pmids\": [\"22031293\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals controlling release from the pore not fully defined\", \"Quantitative substrate set gated by tethering unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed SENP2 in a genotoxic-stress negative-feedback loop, answering how SUMO dynamics on NEMO and IRF3 shape NF-\\u03baB and antiviral output.\",\n      \"evidence\": \"Co-IP, deSUMOylation assays, ChIP, and SENP2-null cells linking NEMO/IRF3 deSUMOylation to IKK/NF-\\u03baB and IFN-\\u03b2 responses\",\n      \"pmids\": [\"21777808\", \"22028379\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crosstalk with other SENPs in the same loop incompletely resolved\", \"In vivo immune consequences not addressed in these studies\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected SENP2 to a transcription-factor stabilization logic, answering how deSUMOylation controls cell differentiation.\",\n      \"evidence\": \"siRNA knockdown, ubiquitination assays, and C/EBP\\u03b2 overexpression rescue in adipogenesis\",\n      \"pmids\": [\"20194620\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SUMO-to-ubiquitin switch on C/EBP\\u03b2 generalizes to other substrates not tested here\", \"Upstream signals regulating SENP2 in adipocytes not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Expanded SENP2 localization beyond the pore to intracellular membranes, answering how the enzyme reaches non-nuclear compartments.\",\n      \"evidence\": \"In vitro membrane-binding assay, BioID interactome, amphipathic-helix mutants, and karyopherin-\\u03b1 regulation\",\n      \"pmids\": [\"29874116\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Membrane-associated substrates only partially identified\", \"Functional role of membrane targeting incompletely defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed SENP2 protects substrates from RNF4-VCP-mediated SUMO-targeted degradation to direct DNA repair pathway choice, linking deSUMOylation to radioresistance.\",\n      \"evidence\": \"SUMOylation assays, focus-retention imaging, NHEJ/HR reporters, and RNF4-VCP epistasis on MDC1\",\n      \"pmids\": [\"30796017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution to HR via free-SUMO provision not separated from direct MDC1 effect\", \"Clinical relevance of 3q amplification in patients not established here\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established SENP2 as a regulator of mitochondrial dynamics, ion channels, and kinase stability, broadening its physiological reach to insulin secretion, neuronal excitability, and metabolism.\",\n      \"evidence\": \"Tissue-specific Senp2 knockout mice, SUMO/ubiquitination assays, electrophysiology, and rescue experiments across DRP1, Kv7.2/3, AMPK\\u03b1, Akt, MEF2A, SMN, PLC\\u03b24\",\n      \"pmids\": [\"35064188\", \"34509475\", \"34971706\", \"33687053\", \"23224591\", \"34628513\", \"34465891\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate prioritization in a given tissue not resolved\", \"Whether single substrate accounts for each phenotype not always isolated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Refined the adipose and vascular roles into defined regulatory axes, answering how SENP2 controls thermogenesis and smooth-muscle phenotype.\",\n      \"evidence\": \"Adipocyte-specific KO mice, Co-IP, ChIP for the C/EBP\\u03b2-DAXX-HOXC10 axis, and myocardin K573 site mutagenesis\",\n      \"pmids\": [\"35196497\", \"36293488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific substrate hierarchy not fully mapped\", \"Some substrate links rest on single-lab evidence\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated mitochondrial and immune metabolic roles and identified acetylation as a brake on SENP2 activity, linking metabolic state to SUMO dynamics.\",\n      \"evidence\": \"Mitochondrial fractionation, in vitro deSUMOylation and acetylation assays for SDHA/CBP, and T cell-specific KO with Smad4 deSUMOylation in colitis\",\n      \"pmids\": [\"36708515\", \"37301920\", \"37462038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How acetylation, phosphorylation, and SUMOylation of SENP2 are integrated remains unresolved\", \"Mitochondrial import mechanism not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified post-translational stabilization and a non-canonical proteolytic activity, expanding both regulation and substrate scope of SENP2.\",\n      \"evidence\": \"USP44 deubiquitination (Co-IP/CHX chase), CHK1 S344 phospho knock-in mice, NCOA4-OTUB1 stability assays, and in vitro \\u03b1-synuclein cleavage\",\n      \"pmids\": [\"41250203\", \"37711550\", \"40366738\", \"40028275\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Non-SUMO proteolytic activity on \\u03b1-synuclein rests on single-lab in vitro evidence\", \"Integration of multiple PTM inputs on SENP2 activity not reconstituted\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the dozens of identified SENP2 substrates are selected and prioritized within a given cell type, and how localization and the layered PTM code (phosphorylation, acetylation, SUMOylation, ubiquitination) are integrated to set activity, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of substrate selection across compartments\", \"PTM crosstalk on SENP2 not reconstituted in vitro\", \"Human disease links largely inferred from mouse models\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2, 4, 6, 15, 21, 30, 36]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [1, 2, 36]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 15, 22, 39]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [0, 3, 14]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [14]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [14]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [30]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [31]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 5, 32]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [15]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [8, 40]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [12, 22, 30, 39]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 13, 28, 39]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [18, 23, 32]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 3, 9]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [9, 21]}\n    ],\n    \"complexes\": [\n      \"nuclear pore complex\",\n      \"kinetochore\"\n    ],\n    \"partners\": [\n      \"Nup153\",\n      \"NEMO\",\n      \"IRF3\",\n      \"MDC1\",\n      \"DRP1\",\n      \"Smad4\",\n      \"AMPK\\u03b1\",\n      \"NCOA4\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}