{"gene":"SENP6","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":2000,"finding":"SENP6 (SUSP1) is a cysteine protease with a conserved His/Asp/Cys catalytic triad that cleaves SUMO-1 from SUMO-1-fusion substrates in vitro, demonstrating specificity for SUMO-1 over other ubiquitin-like proteins. The protein localizes to the cytoplasm in NIH3T3 and HeLa cells.","method":"In vitro protease assay with SUMO-1·β-galactosidase fusion expressed in E. coli; GFP fusion confocal microscopy for localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstituted cleavage assay with direct mutagenic/substrate specificity comparison; replicated in subsequent studies","pmids":["10799485"],"is_preprint":false},{"year":2006,"finding":"SENP6 (SUSP1) localizes to the nucleoplasm and preferentially deconjugates SUMO-2/3 over SUMO-1, acting specifically on substrates containing three or more SUMO-2/3 moieties. Depletion causes redistribution of EGFP-SUMO2/3 into enlarged, more numerous PML bodies, demonstrating a role in dismantling highly poly-SUMOylated species.","method":"siRNA depletion; vinyl sulfone SUMO-paralog inhibitors; fluorescence microscopy with EGFP-SUMO fusions; model poly-SUMO substrate assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (inhibitor profiling, model substrates, live-cell imaging), replicated by independent labs","pmids":["17000875"],"is_preprint":false},{"year":2006,"finding":"SENP6 (SUSP1) co-localizes with RXRα in the nucleus and removes SUMO-1 from RXRα at Lys-108, reversing SUMO-1-mediated transcriptional repression of RXRα. Overexpression of SENP6 increases RXRα transcriptional activity, while knockdown decreases it.","method":"Co-localization by confocal microscopy; in vivo and in vitro SUMOylation assays; shRNA knockdown; transcriptional reporter assays; site-directed mutagenesis (K108R)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods (in vitro/in vivo SUMOylation, KD, OE, reporter) in single lab","pmids":["16912044"],"is_preprint":false},{"year":2008,"finding":"SENP6 preferentially cleaves poly-SUMO2 and poly-SUMO3 chains (di-SUMO2, di-SUMO3, poly-SUMO2/3) with rates comparable to SENP2, but shows much lower activity for processing pre-SUMO1, pre-SUMO2, or pre-SUMO3. Structure-guided mutagenesis of unique elements in the SENP6/SENP7 subclass identifies residues critical for poly-SUMO deconjugation.","method":"Crystal structure of SENP7 catalytic domain at 2.4 Å; in vitro biochemical deconjugation assays with di- and poly-SUMO substrates; structure-guided mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure combined with in vitro reconstituted assays and mutagenesis in single rigorous study","pmids":["18799455"],"is_preprint":false},{"year":2010,"finding":"SENP6 is essential for inner kinetochore assembly during mitosis. SENP6 depletion causes spindle assembly defects and loss of CENP-H/I/K complex from inner kinetochores. CENP-I is degraded by the ubiquitin ligase RNF4 (which targets poly-SUMOylated proteins) and SENP6 stabilizes CENP-I by antagonizing RNF4-mediated proteasomal degradation.","method":"siRNA depletion; immunofluorescence of kinetochore composition; epistasis with RNF4 knockdown; proteasome inhibitor rescue experiments","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with RNF4, multiple orthogonal readouts, replicated across studies","pmids":["20212317"],"is_preprint":false},{"year":2010,"finding":"SENP6 deconjugates SUMO-2/3 and SUMO-1 from PML and can cleave mixed SUMO-1/SUMO-2/3 chains. Catalytic cysteine mutation causes SENP6 accumulation in PML nuclear bodies, and SUMO-modified PML is a direct biochemical substrate of SENP6.","method":"siRNA depletion; immunofluorescence; catalytic mutant trapping in PML bodies; in vitro substrate cleavage assay with SUMO-modified PML","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1–2 — substrate trapping with catalytic mutant combined with in vitro biochemical validation","pmids":["21148299"],"is_preprint":false},{"year":2011,"finding":"A unique Loop1 sequence insertion in SENP6 (and SENP7) forms an extended interface with SUMO and is essential for their SUMO2/3 specificity and poly-SUMO deconjugation activity. Double point mutations on the SUMO surface swap isoform specificity between SUMO1 and SUMO2/3 for SENP6 and SENP7.","method":"Structure-guided mutagenesis; in vitro proteolytic activity assays with SUMO isoform substrates; biochemical characterization of Loop1 chimeras","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis combined with biochemical reconstitution defining structural determinants of specificity","pmids":["21878624"],"is_preprint":false},{"year":2013,"finding":"SENP6 attenuates TLR-triggered NF-κB signaling by catalyzing de-SUMOylation of NEMO/IKKγ at Lys-277. SUMO-2/3 conjugation at this site impairs binding of the deubiquitinase CYLD to NEMO, thereby promoting IKK activation; SENP6 reverses this by removing SUMO from NEMO.","method":"Co-immunoprecipitation; siRNA knockdown; site-directed mutagenesis (K277); luciferase NF-κB reporter; in vivo sepsis model","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, mutagenesis identifying exact modification site, functional epistasis with CYLD, in vivo validation","pmids":["23825957"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of SENP2 chimera containing the SENP6 Loop1 insertion in complex with SUMO2 at 2.15 Å reveals the unique molecular interface formed by Loop1 with SUMO; insertion of Loop1 into SENP2 increases proteolytic activity on di-SUMO2 and poly-SUMO2 substrates.","method":"X-ray crystallography at 2.15 Å; in vitro cleavage assays with diSUMO2 and polySUMO2 substrates","journal":"Protein science","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional reconstitution","pmids":["24424631"],"is_preprint":false},{"year":2018,"finding":"SENP6 interacts with, desumoylates, and stabilizes TRIM28, thereby suppressing p53 activity in osteochondroprogenitors. Loss of SENP6 leads to elevated p53 signaling and SASP, and Trp53 loss partially rescues skeletal and cellular phenotypes in Senp6-knockout mice.","method":"Conditional knockout mouse model; Co-IP; in vitro desumoylation assay; genetic epistasis (Senp6−/−; Trp53−/−); histological and cellular phenotyping","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — genetic epistasis in vivo, Co-IP, in vitro desumoylation, multiple orthogonal methods","pmids":["29321472"],"is_preprint":false},{"year":2019,"finding":"SENP6 regulates a group of over 180 poly-SUMO2/3-modified proteins including the constitutive centromere-associated network (CCAN), CENP-A loading factors Mis18BP1 and Mis18A, and DNA damage response factors. SENP6 deficiency impairs centromeric accumulation of CENP-T, CENP-W, and CENP-A, and the increased SUMO chains act in a proteolysis-independent manner.","method":"Quantitative SUMO proteomics after SENP6 knockdown; immunofluorescence; cell proliferation and cell cycle analysis; epistasis with proteasome inhibitor","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — large-scale proteomic substrate identification combined with functional cell biology, replicated with prior kinetochore findings","pmids":["31485003"],"is_preprint":false},{"year":2019,"finding":"SENP6 contains an N-terminal multi-SIM domain that targets it to SUMO chains. SENP6 acts as a SUMO eraser at telomeric and centromeric chromatin, controls SUMOylation and chromatin association of cohesin, and is a component of the hPSO4/PRP19 complex. SENP6 deficiency impairs chromatin association of ATRIP, thereby compromising ATR-Chk1 activation under replicative stress.","method":"Domain mapping; proteomic profiling; Co-IP identifying hPSO4/PRP19 complex membership; chromatin fractionation; siRNA knockdown with Chk1 activation readout","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — domain mapping, complex identification by MS, functional epistasis for ATR-Chk1 pathway, multiple orthogonal methods","pmids":["31597105"],"is_preprint":false},{"year":2021,"finding":"SENP6 mediates deSUMOylation of Annexin-A1 (ANXA1), promoting its nuclear translocation and triggering neuronal apoptosis after cerebral ischemia-reperfusion. SENP6-mediated deSUMOylation of ANXA1 promotes TRPM7- and PKC-dependent phosphorylation of ANXA1, activates p53 transcriptional activity, and induces the Bid/caspase-3 apoptosis pathway.","method":"Co-immunoprecipitation; Ni2+-NTA pulldown for SUMOylation; luciferase reporter; SENP6 catalytic mutant overexpression in vivo; MCAO mouse model","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, SUMOylation assay, catalytic mutant in vivo; single lab","pmids":["34158860"],"is_preprint":false},{"year":2022,"finding":"SENP6 loss drives chromosomal instability in lymphoma by releasing DNA repair and genome maintenance protein complexes from chromatin, impairing DNA repair. SENP6 deficiency creates synthetic lethality with PARP inhibition.","method":"Transposon mutagenesis screen in vivo; siRNA knockdown; chromatin fractionation; DNA damage repair assays; PARP inhibitor synthetic lethality in cell lines and mouse models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — genome-wide in vivo screen, chromatin fractionation, synthetic lethality confirmed in multiple systems","pmids":["35022408"],"is_preprint":false},{"year":2022,"finding":"SENP6-mediated deSUMOylation of ANXA1 in microglia targets the IKK complex and selectively inhibits autophagic degradation of IKKα in an NBR1-dependent manner, activating the NF-κB pathway and enhancing proinflammatory cytokine expression after ischemic stroke.","method":"Co-immunoprecipitation; AAV-mediated SENP6 knockdown in microglia in vivo; immunoblot; MCAO mouse model","journal":"Cell & bioscience","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with in vivo AAV knockdown, single lab","pmids":["35869493"],"is_preprint":false},{"year":2023,"finding":"SENP6 deconjugates SUMO2/3 polymers from a group of DNA damage response proteins (BRCA1-BARD1, 53BP1, BLM, ERCC1-XPF), maintaining them in a hypo-SUMOylated state. SENP6 depletion causes uncoordinated recruitment of these proteins at DNA damage sites and accumulation of SUMO2/3 and DDR proteins in PML-independent nuclear condensates driven by multivalent SUMO-SIM interactions. Co-depletion with RNF4 further increases SUMOylation of BRCA1, BARD1, and BLM.","method":"Quantitative proteomics; live-cell imaging at laser-induced damage sites; Co-depletion epistasis with RNF4; immunofluorescence of nuclear bodies","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — proteomic substrate identification, genetic epistasis with RNF4, live-cell imaging, multiple orthogonal methods","pmids":["37735495"],"is_preprint":false},{"year":2023,"finding":"SENP6 depletion causes hyperSUMOylation of lamin A/C family proteins, leading to nuclear structural changes resembling laminopathies. Proximity-induced SUMO modification (PISM) directly targeting lamin A/C for SUMO conjugation recapitulates the altered nuclear structure, establishing a direct causal link between lamin SUMOylation and nuclear morphology defects.","method":"Proteomic identification of SENP6 substrates; PISM (DARPin-fused SUMO E3 ligase domain) to directly SUMOylate lamin A/C; immunofluorescence of nuclear structure","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 — novel proximity-based tool with functional reconstitution of phenotype, orthogonal proteomic substrate identification","pmids":["37556322"],"is_preprint":false},{"year":2023,"finding":"SENP6 mediates deSUMOylation of VEGFR2, reducing its accumulation in the Golgi and promoting its transport to the cell membrane surface via COPB2 (coatomer protein complex subunit beta 2), enhancing VEGF-VEGFR2 signaling and angiogenesis.","method":"Co-immunoprecipitation; immunofluorescence; immunoblotting in HUVECs","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 — Co-IP and immunofluorescence, single lab, single method set","pmids":["36768878"],"is_preprint":false},{"year":2024,"finding":"SENP6 constitutively interacts with USP8 and deSUMOylates USP8, which restricts the interaction between USP8 and IFNAR2. Reduced USP8-IFNAR2 interaction enhances IFNAR2 ubiquitination and degradation, thereby attenuating type I IFN signaling and antiviral activity.","method":"Co-immunoprecipitation; SUMOylation assay; IFNAR2 ubiquitination assay; siRNA knockdown","journal":"Cellular & molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP, ubiquitination assays, mechanistic pathway placement; single lab","pmids":["38906982"],"is_preprint":false},{"year":2024,"finding":"SENP6 binds to and mediates deSUMOylation of Nrf2, which promotes ubiquitination-dependent proteasomal degradation of Nrf2, reducing its transcriptional activity and exacerbating oxidative stress after ischemic stroke. A cell-permeable peptide (Tat-Nrf2) blocking SENP6-Nrf2 interaction preserves Nrf2 SUMOylation and reduces neuronal damage.","method":"Co-immunoprecipitation; in vitro deSUMOylation assay; ubiquitination assay; cell-permeable inhibitory peptide; MCAO mouse model","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, in vitro deSUMOylation, peptide inhibitor in vivo; single lab","pmids":["39716997"],"is_preprint":false},{"year":2024,"finding":"SENP6 interacts with PINK1 and reduces SUMO2-ylation of PINK1, thereby enhancing mitophagy and promoting temozolomide resistance in glioma cells.","method":"RNA sequencing; Co-immunoprecipitation; SUMOylation assay; siRNA knockdown","journal":"Molekuliarnaia biologiia","confidence":"Low","confidence_rationale":"Tier 3 — single Co-IP and SUMOylation assay, single lab, limited mechanistic follow-up","pmids":["38062972"],"is_preprint":false},{"year":2025,"finding":"SENP6 deSUMOylates TOM40 to maintain TOM complex assembly and mitochondrial protein import. SENP6 knockdown causes TOM40 SUMOylation, impairing TOM complex assembly and mitochondrial protein import, leading to loss of mitochondrial proteostasis, morphology, and function. CCCP treatment decreases mitochondrial SENP6, and TOM40 SUMOylation is increased in Alzheimer's disease mouse brains.","method":"SENP6 knockdown; Co-immunoprecipitation; SUMOylation assay; TOM complex blue native PAGE; mitochondrial import assay; fractionation","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 — multiple assays (Co-IP, SUMOylation, import assay, BN-PAGE), single lab","pmids":["40729740"],"is_preprint":false},{"year":2026,"finding":"SENP6 interacts with and deSUMOylates NLRP3 at Lys-23, Lys-204, and Lys-689. DeSUMOylation by SENP6 enables K48-linked polyubiquitination of NLRP3 by the E3 ligase MARCHF7 (recruited by SENP6), leading to autophagy-lysosomal degradation of NLRP3 and suppression of inflammasome activation.","method":"Co-immunoprecipitation; site-directed mutagenesis (K23R, K204R, K689R); NLRP3 ubiquitination assay; SENP6 knockdown in macrophages; in vivo LPS and alum models","journal":"Research (Washington, D.C.)","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis identifying deSUMOylation sites, Co-IP with E3 ligase, in vivo validation; single lab","pmids":["41531891"],"is_preprint":false},{"year":2026,"finding":"SENP6 deSUMOylates SMAD5, leading to SMAD5 protein instability; SENP6 knockdown stabilizes SMAD5, which directly activates SOX2 transcription to promote early osteogenic commitment of periodontal ligament stem cells.","method":"Co-immunoprecipitation; siRNA knockdown; luciferase transcriptional reporter; SENP6 inhibitor (NSC632839) in vivo calvarial osteolysis model; micro-CT","journal":"European journal of medical research","confidence":"Low","confidence_rationale":"Tier 3 — single lab, Co-IP and KD with phenotype but limited biochemical mechanistic depth","pmids":["41618460"],"is_preprint":false}],"current_model":"SENP6 is a nucleoplasmic SUMO-2/3-preferring isopeptidase with an N-terminal multi-SIM domain that targets it to poly-SUMO chains; its catalytic Loop1 insertion confers specificity for SUMO2/3 polymers, enabling it to act as a group deSUMOylase that maintains the hypo-SUMOylated, chromatin-associated state of functionally interconnected protein complexes including inner kinetochore components (CCAN/CENP-I), cohesin, DNA damage response factors (BRCA1-BARD1, 53BP1, BLM), and nuclear lamins, while also deSUMOylating signaling proteins such as NEMO (dampening NF-κB), TRIM28 (suppressing p53), NLRP3, VEGFR2, USP8, and Nrf2, thereby broadly coordinating genome stability, chromosome segregation, nuclear architecture, innate immune signaling, and mitochondrial homeostasis."},"narrative":{"teleology":[{"year":2000,"claim":"Establishing SENP6 as a SUMO-specific cysteine protease resolved its biochemical identity: the His/Asp/Cys catalytic triad cleaves SUMO-1 from conjugated substrates with specificity over other ubiquitin-like modifiers.","evidence":"In vitro cleavage of SUMO-1–β-galactosidase fusion in E. coli with mutagenic validation; GFP-fusion localization in NIH3T3 and HeLa cells","pmids":["10799485"],"confidence":"High","gaps":["Initial localization to cytoplasm was later revised to nucleoplasm","SUMO-2/3 paralog preference not yet tested","No endogenous substrates identified"]},{"year":2006,"claim":"Demonstrating that SENP6 preferentially cleaves poly-SUMO2/3 chains rather than SUMO-1, and that its depletion causes PML body enlargement via SUMO2/3 accumulation, established its in vivo substrate specificity and functional niche as a poly-SUMO2/3 chain editor in the nucleoplasm.","evidence":"siRNA depletion with vinyl sulfone SUMO-paralog inhibitors, EGFP-SUMO live-cell imaging, and model poly-SUMO substrate assays","pmids":["17000875"],"confidence":"High","gaps":["Structural basis for SUMO2/3 preference not yet defined","Endogenous substrate repertoire unknown"]},{"year":2008,"claim":"Biochemical and structural analysis revealed that SENP6 (and SENP7) possess unique catalytic domain features—including Loop1—that confer efficient poly-SUMO2/3 deconjugation while rendering them poor at SUMO precursor processing, distinguishing them from other SENP family members.","evidence":"Crystal structure of SENP7 catalytic domain at 2.4 Å; in vitro cleavage assays with di- and poly-SUMO substrates; structure-guided mutagenesis","pmids":["18799455"],"confidence":"High","gaps":["SENP6 catalytic domain structure not directly solved","Loop1-SUMO interface not yet visualized at atomic resolution"]},{"year":2010,"claim":"Showing that SENP6 is essential for inner kinetochore assembly—by preventing poly-SUMO-dependent RNF4-mediated degradation of CENP-H/I/K—established the first cellular process requiring SENP6 chain-editing activity and linked deSUMOylation to chromosome segregation fidelity.","evidence":"siRNA depletion with immunofluorescence of kinetochore composition; epistasis with RNF4 knockdown; proteasome inhibitor rescue","pmids":["20212317"],"confidence":"High","gaps":["Mechanism by which SENP6 is recruited to centromeric chromatin unresolved","Direct deSUMOylation of CENP-I not biochemically reconstituted"]},{"year":2011,"claim":"Defining the Loop1 insertion as the structural determinant of SUMO2/3 specificity—and showing that SUMO surface mutations swap isoform preference—resolved how SENP6/7 achieve paralog-selective poly-chain editing at a molecular level.","evidence":"Structure-guided mutagenesis of Loop1; in vitro proteolytic assays with chimeric SENP and SUMO isoform substrates","pmids":["21878624"],"confidence":"High","gaps":["Full SENP6 crystal structure still lacking","Contribution of non-catalytic domains to substrate targeting not addressed"]},{"year":2013,"claim":"Identifying NEMO/IKKγ Lys-277 as a SENP6 deSUMOylation site that controls CYLD binding established a direct mechanism by which SENP6 dampens NF-κB signaling downstream of TLRs, extending its role to innate immune regulation.","evidence":"Co-IP, K277 mutagenesis, NF-κB luciferase reporter, epistasis with CYLD, in vivo sepsis model","pmids":["23825957"],"confidence":"High","gaps":["Whether SENP6 regulation of NEMO is stimulus-specific unknown","Regulation of SENP6 itself in immune signaling unexplored"]},{"year":2014,"claim":"The crystal structure of a SENP2-Loop1 chimera in complex with SUMO2 directly visualized the Loop1-SUMO interface, confirming that this insertion creates an extended binding surface that enhances poly-SUMO2 processing.","evidence":"X-ray crystallography at 2.15 Å; in vitro cleavage assays with diSUMO2 and polySUMO2","pmids":["24424631"],"confidence":"High","gaps":["Native SENP6 catalytic domain structure not solved","How Loop1 accommodates branched SUMO chains unknown"]},{"year":2018,"claim":"Demonstrating that SENP6 stabilizes TRIM28 via deSUMOylation to suppress p53 in osteochondroprogenitors—with genetic rescue by Trp53 loss in knockout mice—provided the first in vivo genetic evidence linking SENP6 catalytic activity to a specific developmental signaling pathway.","evidence":"Conditional knockout mouse; Co-IP; in vitro deSUMOylation; Senp6−/−;Trp53−/− epistasis; histological phenotyping","pmids":["29321472"],"confidence":"High","gaps":["Whether SENP6 controls p53 in other tissues unknown","Direct TRIM28 deSUMOylation sites not mapped"]},{"year":2019,"claim":"Quantitative SUMO proteomics after SENP6 depletion identified >180 hyper-SUMOylated substrates—including CCAN components, CENP-A loading factors, cohesin, and DNA repair proteins—revealing SENP6 as a group deSUMOylase that maintains the hypo-SUMOylated state of functionally interconnected chromatin-associated complexes, with effects partly independent of proteasomal degradation.","evidence":"Quantitative SUMO proteomics; immunofluorescence; cell cycle analysis; proteasome inhibitor epistasis; domain mapping identifying N-terminal multi-SIM domain; hPSO4/PRP19 complex identification by MS; chromatin fractionation","pmids":["31485003","31597105"],"confidence":"High","gaps":["Whether SENP6 acts co-translationally or post-assembly on chromatin complexes unclear","Signal that recruits SENP6 to specific chromatin loci unknown"]},{"year":2022,"claim":"An in vivo transposon screen identified SENP6 loss as a driver of chromosomal instability in lymphoma by releasing genome maintenance complexes from chromatin, and demonstrated synthetic lethality with PARP inhibition, establishing therapeutic relevance.","evidence":"Transposon mutagenesis screen; chromatin fractionation; DNA repair assays; PARP inhibitor synthetic lethality in cell lines and mouse models","pmids":["35022408"],"confidence":"High","gaps":["Biomarker strategy for patient selection not developed","Whether specific SENP6 mutations occur in human lymphomas not addressed"]},{"year":2023,"claim":"Showing that SENP6 depletion causes DDR proteins (BRCA1-BARD1, 53BP1, BLM) to accumulate in PML-independent SUMO-SIM-driven nuclear condensates explained the mechanistic basis of impaired DNA repair: uncontrolled poly-SUMOylation drives phase separation that sequesters repair factors away from damage sites.","evidence":"Quantitative proteomics; live-cell imaging at laser-induced damage sites; RNF4 co-depletion epistasis; immunofluorescence","pmids":["37735495"],"confidence":"High","gaps":["Whether condensate formation is reversible upon SENP6 re-expression untested","Biophysical characterization of SUMO-SIM condensates lacking"]},{"year":2023,"claim":"Directly SUMOylating lamin A/C via a proximity-induced tool (PISM) recapitulated nuclear morphology defects seen upon SENP6 loss, establishing that lamin deSUMOylation by SENP6 is causally required for normal nuclear architecture.","evidence":"Proteomic substrate identification; DARPin-fused SUMO E3 proximity tool targeting lamin A/C; immunofluorescence","pmids":["37556322"],"confidence":"High","gaps":["Lamin SUMOylation sites not mapped","Downstream consequences for gene expression or mechanotransduction not explored"]},{"year":2024,"claim":"Identification of USP8 and Nrf2 as SENP6 substrates extended SENP6's regulatory reach to type I interferon signaling (via USP8-IFNAR2 axis) and oxidative stress defense (via Nrf2 stability), revealing its role as a signaling rheostat beyond chromatin biology.","evidence":"Co-IP, SUMOylation/ubiquitination assays for USP8-IFNAR2; in vitro deSUMOylation and cell-permeable inhibitory peptide for Nrf2; MCAO model","pmids":["38906982","39716997"],"confidence":"Medium","gaps":["USP8 and Nrf2 findings each from single labs","Physiological relevance of SENP6-USP8 axis in viral infection not validated in vivo"]},{"year":2025,"claim":"Demonstrating that SENP6 deSUMOylates TOM40 to maintain TOM complex assembly and mitochondrial protein import established a role for SENP6 in mitochondrial proteostasis, with disease relevance suggested by increased TOM40 SUMOylation in Alzheimer's disease mouse brains.","evidence":"SENP6 knockdown; Co-IP; BN-PAGE for TOM complex assembly; mitochondrial import assay; subcellular fractionation","pmids":["40729740"],"confidence":"Medium","gaps":["Single lab finding","Whether SENP6 acts at the outer mitochondrial membrane or in the cytosol unclear","Causal role in Alzheimer's pathogenesis not established"]},{"year":2026,"claim":"Mapping SENP6-dependent deSUMOylation of NLRP3 at three lysine residues, and showing this licenses MARCHF7-mediated ubiquitination and autophagic degradation, defined a complete SUMO-to-ubiquitin switch mechanism by which SENP6 suppresses inflammasome activation.","evidence":"Co-IP; K23R/K204R/K689R mutagenesis; ubiquitination assay; macrophage knockdown; in vivo LPS and alum models","pmids":["41531891"],"confidence":"Medium","gaps":["Single lab","Whether this mechanism operates in human inflammasome-driven diseases untested","MARCHF7 recruitment mechanism by SENP6 not fully defined"]},{"year":null,"claim":"Key open questions include the full-length SENP6 structure, how SENP6 is recruited to specific chromatin loci and signaling complexes, what regulates SENP6 abundance and activity under stress, and whether its group deSUMOylase function can be therapeutically targeted.","evidence":"","pmids":[],"confidence":"High","gaps":["No full-length SENP6 structure available","Post-translational regulation of SENP6 itself largely unexplored","No selective SENP6 inhibitors reported","Relative contributions of proteasomal vs. condensate-mediated pathology upon SENP6 loss not quantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,3,5,6,7,8,9,10,15,16,18,19,21,22]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,1,3,6,8]}],"localization":[{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[1,2,5,11,15,16]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[4,10,11,13]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4,10,11,13]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[11,13,15]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,14,18,22]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[10,11,15,16]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,3,6,9]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[12]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[14,22]}],"complexes":["hPSO4/PRP19 complex"],"partners":["NEMO","TRIM28","NLRP3","TOM40","USP8","CENP-I","PINK1","NRF2"],"other_free_text":[]},"mechanistic_narrative":"SENP6 is a nucleoplasmic SUMO-2/3-preferring cysteine protease that functions as a group deSUMOylase, maintaining the hypo-SUMOylated state of functionally interconnected chromatin-associated protein complexes to coordinate genome stability, chromosome segregation, nuclear architecture, and innate immune signaling. Its catalytic domain contains a unique Loop1 insertion that confers specificity for poly-SUMO2/3 chains, and its N-terminal multi-SIM domain targets it to poly-SUMOylated substrates [PMID:21878624, PMID:31597105]. By antagonizing poly-SUMO2/3 accumulation on inner kinetochore components (CENP-H/I/K, CENP-T/W/A), cohesin, DNA damage response factors (BRCA1-BARD1, 53BP1, BLM), and nuclear lamins, SENP6 prevents RNF4-mediated proteasomal degradation or aberrant condensate formation, thereby preserving centromere integrity, DNA repair competence, and nuclear morphology [PMID:20212317, PMID:37735495, PMID:37556322]. SENP6 also deSUMOylates signaling regulators including NEMO to dampen NF-κB activation, TRIM28 to suppress p53, NLRP3 to promote its autophagic degradation, and TOM40 to maintain mitochondrial protein import [PMID:23825957, PMID:29321472, PMID:41531891, PMID:40729740]."},"prefetch_data":{"uniprot":{"accession":"Q9GZR1","full_name":"Sentrin-specific protease 6","aliases":["SUMO-1-specific protease 1","Sentrin/SUMO-specific protease SENP6"],"length_aa":1112,"mass_kda":126.1,"function":"Protease that deconjugates SUMO1, SUMO2 and SUMO3 from targeted proteins. Processes preferentially poly-SUMO2 and poly-SUMO3 chains, but does not efficiently process SUMO1, SUMO2 and SUMO3 precursors. Deconjugates SUMO1 from RXRA, leading to transcriptional activation. Involved in chromosome alignment and spindle assembly, by regulating the kinetochore CENPH-CENPI-CENPK complex. Desumoylates PML and CENPI, protecting them from degradation by the ubiquitin ligase RNF4, which targets polysumoylated proteins for proteasomal degradation. Also desumoylates RPA1, thus preventing recruitment of RAD51 to the DNA damage foci to initiate DNA repair through homologous recombination","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9GZR1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/SENP6","classification":"Common Essential","n_dependent_lines":1190,"n_total_lines":1208,"dependency_fraction":0.9850993377483444},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PRPF19","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SENP6","total_profiled":1310},"omim":[{"mim_id":"612846","title":"SENTRIN-SPECIFIC PROTEASE FAMILY, MEMBER 7; SENP7","url":"https://www.omim.org/entry/612846"},{"mim_id":"609758","title":"Na+/K+ TRANSPORTING ATPase-INTERACTING 2; NKAIN2","url":"https://www.omim.org/entry/609758"},{"mim_id":"605003","title":"SENTRIN-SPECIFIC PROTEASE FAMILY, MEMBER 6; SENP6","url":"https://www.omim.org/entry/605003"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SENP6"},"hgnc":{"alias_symbol":["SUSP1","KIAA0797"],"prev_symbol":[]},"alphafold":{"accession":"Q9GZR1","domains":[{"cath_id":"2.30.29","chopping":"443-531_541-601","consensus_level":"high","plddt":79.6498,"start":443,"end":601},{"cath_id":"3.30.310.130","chopping":"654-722_732-789_962-1094","consensus_level":"high","plddt":90.288,"start":654,"end":1094}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9GZR1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9GZR1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9GZR1-F1-predicted_aligned_error_v6.png","plddt_mean":54.66},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SENP6","jax_strain_url":"https://www.jax.org/strain/search?query=SENP6"},"sequence":{"accession":"Q9GZR1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9GZR1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9GZR1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9GZR1"}},"corpus_meta":[{"pmid":"17000875","id":"PMC_17000875","title":"SUSP1 antagonizes formation of highly SUMO2/3-conjugated species.","date":"2006","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/17000875","citation_count":129,"is_preprint":false},{"pmid":"10799485","id":"PMC_10799485","title":"A new SUMO-1-specific protease, SUSP1, that is highly expressed in reproductive organs.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10799485","citation_count":124,"is_preprint":false},{"pmid":"18799455","id":"PMC_18799455","title":"Structure of the human SENP7 catalytic domain and poly-SUMO deconjugation activities for SENP6 and SENP7.","date":"2008","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/18799455","citation_count":118,"is_preprint":false},{"pmid":"20212317","id":"PMC_20212317","title":"The SUMO protease SENP6 is essential for inner kinetochore assembly.","date":"2010","source":"The Journal of cell 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modulation of RXRalpha transcriptional activity by small ubiquitin-related modifier (SUMO) modification and its reversal by SUMO-specific protease SUSP1.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16912044","citation_count":59,"is_preprint":false},{"pmid":"31597105","id":"PMC_31597105","title":"The SUMO Isopeptidase SENP6 Functions as a Rheostat of Chromatin Residency in Genome Maintenance and Chromosome Dynamics.","date":"2019","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/31597105","citation_count":58,"is_preprint":false},{"pmid":"34158860","id":"PMC_34158860","title":"Inhibition of SENP6 restrains cerebral ischemia-reperfusion injury by regulating Annexin-A1 nuclear translocation-associated neuronal apoptosis.","date":"2021","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/34158860","citation_count":50,"is_preprint":false},{"pmid":"31781182","id":"PMC_31781182","title":"Ethanol Exposure Induces Microglia Activation and Neuroinflammation through TLR4 Activation and SENP6 Modulation in the Adolescent Rat Hippocampus.","date":"2019","source":"Neural plasticity","url":"https://pubmed.ncbi.nlm.nih.gov/31781182","citation_count":41,"is_preprint":false},{"pmid":"21878624","id":"PMC_21878624","title":"Swapping small ubiquitin-like modifier (SUMO) isoform specificity of SUMO proteases SENP6 and SENP7.","date":"2011","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21878624","citation_count":32,"is_preprint":false},{"pmid":"29321472","id":"PMC_29321472","title":"Desumoylase SENP6 maintains osteochondroprogenitor homeostasis by suppressing the p53 pathway.","date":"2018","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/29321472","citation_count":31,"is_preprint":false},{"pmid":"37735495","id":"PMC_37735495","title":"SENP6 regulates localization and nuclear condensation of DNA damage response proteins by group deSUMOylation.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/37735495","citation_count":30,"is_preprint":false},{"pmid":"35022408","id":"PMC_35022408","title":"Genetic alterations of the SUMO isopeptidase SENP6 drive lymphomagenesis and genetic instability in diffuse large B-cell lymphoma.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/35022408","citation_count":23,"is_preprint":false},{"pmid":"35869493","id":"PMC_35869493","title":"SENP6 induces microglial polarization and neuroinflammation through de-SUMOylation of Annexin-A1 after cerebral ischaemia-reperfusion injury.","date":"2022","source":"Cell & bioscience","url":"https://pubmed.ncbi.nlm.nih.gov/35869493","citation_count":23,"is_preprint":false},{"pmid":"23461386","id":"PMC_23461386","title":"Inhibition of SENP6-induced radiosensitization of human hepatocellular carcinoma cells by blocking radiation-induced NF-κB 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and Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26608369","citation_count":7,"is_preprint":false},{"pmid":"38906982","id":"PMC_38906982","title":"SENP6 restricts the IFN-I-induced signaling pathway and antiviral activity by deSUMOylating USP8.","date":"2024","source":"Cellular & molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/38906982","citation_count":6,"is_preprint":false},{"pmid":"29422621","id":"PMC_29422621","title":"Publisher Correction: Desumoylase SENP6 maintains osteochondroprogenitor homeostasis by suppressing the p53 pathway.","date":"2018","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/29422621","citation_count":4,"is_preprint":false},{"pmid":"40729740","id":"PMC_40729740","title":"SENP6 Maintains Mitochondrial Homeostasis by Regulating Mitochondrial Protein Import Through deSUMOylation of TOM40.","date":"2025","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/40729740","citation_count":2,"is_preprint":false},{"pmid":"38062972","id":"PMC_38062972","title":"[Interaction of SENP6 with PINK1 Promotes Temozolomide Resistance in Neuroglioma Cells via Inducing the Mitophagy].","date":"2024","source":"Molekuliarnaia biologiia","url":"https://pubmed.ncbi.nlm.nih.gov/38062972","citation_count":0,"is_preprint":false},{"pmid":"41494663","id":"PMC_41494663","title":"Anisomycin Induces Senescence and Death of Ovarian Cancer Stem Cells Through the MicroRNA-340/SENP6/SUMOylation Pathway.","date":"2026","source":"The journal of gene medicine","url":"https://pubmed.ncbi.nlm.nih.gov/41494663","citation_count":0,"is_preprint":false},{"pmid":"41531891","id":"PMC_41531891","title":"SENP6 Restrains NLRP3 Inflammasome Activation via DeSUMOylation-Driven K48-Linked Ubiquitination of NLRP3 in Acute Lung Injury.","date":"2026","source":"Research (Washington, D.C.)","url":"https://pubmed.ncbi.nlm.nih.gov/41531891","citation_count":0,"is_preprint":false},{"pmid":"41618460","id":"PMC_41618460","title":"SENP6-mediated desumoylation of SMAD5 regulates osteogenic fate in periodontal ligament stem cells.","date":"2026","source":"European journal of medical research","url":"https://pubmed.ncbi.nlm.nih.gov/41618460","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":15209,"output_tokens":6194,"usd":0.069268},"stage2":{"model":"claude-opus-4-6","input_tokens":9831,"output_tokens":4230,"usd":0.232357},"total_usd":0.301625,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"SENP6 (SUSP1) is a cysteine protease with a conserved His/Asp/Cys catalytic triad that cleaves SUMO-1 from SUMO-1-fusion substrates in vitro, demonstrating specificity for SUMO-1 over other ubiquitin-like proteins. The protein localizes to the cytoplasm in NIH3T3 and HeLa cells.\",\n      \"method\": \"In vitro protease assay with SUMO-1·β-galactosidase fusion expressed in E. coli; GFP fusion confocal microscopy for localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstituted cleavage assay with direct mutagenic/substrate specificity comparison; replicated in subsequent studies\",\n      \"pmids\": [\"10799485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SENP6 (SUSP1) localizes to the nucleoplasm and preferentially deconjugates SUMO-2/3 over SUMO-1, acting specifically on substrates containing three or more SUMO-2/3 moieties. Depletion causes redistribution of EGFP-SUMO2/3 into enlarged, more numerous PML bodies, demonstrating a role in dismantling highly poly-SUMOylated species.\",\n      \"method\": \"siRNA depletion; vinyl sulfone SUMO-paralog inhibitors; fluorescence microscopy with EGFP-SUMO fusions; model poly-SUMO substrate assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (inhibitor profiling, model substrates, live-cell imaging), replicated by independent labs\",\n      \"pmids\": [\"17000875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SENP6 (SUSP1) co-localizes with RXRα in the nucleus and removes SUMO-1 from RXRα at Lys-108, reversing SUMO-1-mediated transcriptional repression of RXRα. Overexpression of SENP6 increases RXRα transcriptional activity, while knockdown decreases it.\",\n      \"method\": \"Co-localization by confocal microscopy; in vivo and in vitro SUMOylation assays; shRNA knockdown; transcriptional reporter assays; site-directed mutagenesis (K108R)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods (in vitro/in vivo SUMOylation, KD, OE, reporter) in single lab\",\n      \"pmids\": [\"16912044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SENP6 preferentially cleaves poly-SUMO2 and poly-SUMO3 chains (di-SUMO2, di-SUMO3, poly-SUMO2/3) with rates comparable to SENP2, but shows much lower activity for processing pre-SUMO1, pre-SUMO2, or pre-SUMO3. Structure-guided mutagenesis of unique elements in the SENP6/SENP7 subclass identifies residues critical for poly-SUMO deconjugation.\",\n      \"method\": \"Crystal structure of SENP7 catalytic domain at 2.4 Å; in vitro biochemical deconjugation assays with di- and poly-SUMO substrates; structure-guided mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with in vitro reconstituted assays and mutagenesis in single rigorous study\",\n      \"pmids\": [\"18799455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SENP6 is essential for inner kinetochore assembly during mitosis. SENP6 depletion causes spindle assembly defects and loss of CENP-H/I/K complex from inner kinetochores. CENP-I is degraded by the ubiquitin ligase RNF4 (which targets poly-SUMOylated proteins) and SENP6 stabilizes CENP-I by antagonizing RNF4-mediated proteasomal degradation.\",\n      \"method\": \"siRNA depletion; immunofluorescence of kinetochore composition; epistasis with RNF4 knockdown; proteasome inhibitor rescue experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with RNF4, multiple orthogonal readouts, replicated across studies\",\n      \"pmids\": [\"20212317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SENP6 deconjugates SUMO-2/3 and SUMO-1 from PML and can cleave mixed SUMO-1/SUMO-2/3 chains. Catalytic cysteine mutation causes SENP6 accumulation in PML nuclear bodies, and SUMO-modified PML is a direct biochemical substrate of SENP6.\",\n      \"method\": \"siRNA depletion; immunofluorescence; catalytic mutant trapping in PML bodies; in vitro substrate cleavage assay with SUMO-modified PML\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — substrate trapping with catalytic mutant combined with in vitro biochemical validation\",\n      \"pmids\": [\"21148299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A unique Loop1 sequence insertion in SENP6 (and SENP7) forms an extended interface with SUMO and is essential for their SUMO2/3 specificity and poly-SUMO deconjugation activity. Double point mutations on the SUMO surface swap isoform specificity between SUMO1 and SUMO2/3 for SENP6 and SENP7.\",\n      \"method\": \"Structure-guided mutagenesis; in vitro proteolytic activity assays with SUMO isoform substrates; biochemical characterization of Loop1 chimeras\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis combined with biochemical reconstitution defining structural determinants of specificity\",\n      \"pmids\": [\"21878624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SENP6 attenuates TLR-triggered NF-κB signaling by catalyzing de-SUMOylation of NEMO/IKKγ at Lys-277. SUMO-2/3 conjugation at this site impairs binding of the deubiquitinase CYLD to NEMO, thereby promoting IKK activation; SENP6 reverses this by removing SUMO from NEMO.\",\n      \"method\": \"Co-immunoprecipitation; siRNA knockdown; site-directed mutagenesis (K277); luciferase NF-κB reporter; in vivo sepsis model\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, mutagenesis identifying exact modification site, functional epistasis with CYLD, in vivo validation\",\n      \"pmids\": [\"23825957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of SENP2 chimera containing the SENP6 Loop1 insertion in complex with SUMO2 at 2.15 Å reveals the unique molecular interface formed by Loop1 with SUMO; insertion of Loop1 into SENP2 increases proteolytic activity on di-SUMO2 and poly-SUMO2 substrates.\",\n      \"method\": \"X-ray crystallography at 2.15 Å; in vitro cleavage assays with diSUMO2 and polySUMO2 substrates\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional reconstitution\",\n      \"pmids\": [\"24424631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SENP6 interacts with, desumoylates, and stabilizes TRIM28, thereby suppressing p53 activity in osteochondroprogenitors. Loss of SENP6 leads to elevated p53 signaling and SASP, and Trp53 loss partially rescues skeletal and cellular phenotypes in Senp6-knockout mice.\",\n      \"method\": \"Conditional knockout mouse model; Co-IP; in vitro desumoylation assay; genetic epistasis (Senp6−/−; Trp53−/−); histological and cellular phenotyping\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic epistasis in vivo, Co-IP, in vitro desumoylation, multiple orthogonal methods\",\n      \"pmids\": [\"29321472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SENP6 regulates a group of over 180 poly-SUMO2/3-modified proteins including the constitutive centromere-associated network (CCAN), CENP-A loading factors Mis18BP1 and Mis18A, and DNA damage response factors. SENP6 deficiency impairs centromeric accumulation of CENP-T, CENP-W, and CENP-A, and the increased SUMO chains act in a proteolysis-independent manner.\",\n      \"method\": \"Quantitative SUMO proteomics after SENP6 knockdown; immunofluorescence; cell proliferation and cell cycle analysis; epistasis with proteasome inhibitor\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — large-scale proteomic substrate identification combined with functional cell biology, replicated with prior kinetochore findings\",\n      \"pmids\": [\"31485003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SENP6 contains an N-terminal multi-SIM domain that targets it to SUMO chains. SENP6 acts as a SUMO eraser at telomeric and centromeric chromatin, controls SUMOylation and chromatin association of cohesin, and is a component of the hPSO4/PRP19 complex. SENP6 deficiency impairs chromatin association of ATRIP, thereby compromising ATR-Chk1 activation under replicative stress.\",\n      \"method\": \"Domain mapping; proteomic profiling; Co-IP identifying hPSO4/PRP19 complex membership; chromatin fractionation; siRNA knockdown with Chk1 activation readout\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain mapping, complex identification by MS, functional epistasis for ATR-Chk1 pathway, multiple orthogonal methods\",\n      \"pmids\": [\"31597105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SENP6 mediates deSUMOylation of Annexin-A1 (ANXA1), promoting its nuclear translocation and triggering neuronal apoptosis after cerebral ischemia-reperfusion. SENP6-mediated deSUMOylation of ANXA1 promotes TRPM7- and PKC-dependent phosphorylation of ANXA1, activates p53 transcriptional activity, and induces the Bid/caspase-3 apoptosis pathway.\",\n      \"method\": \"Co-immunoprecipitation; Ni2+-NTA pulldown for SUMOylation; luciferase reporter; SENP6 catalytic mutant overexpression in vivo; MCAO mouse model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, SUMOylation assay, catalytic mutant in vivo; single lab\",\n      \"pmids\": [\"34158860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SENP6 loss drives chromosomal instability in lymphoma by releasing DNA repair and genome maintenance protein complexes from chromatin, impairing DNA repair. SENP6 deficiency creates synthetic lethality with PARP inhibition.\",\n      \"method\": \"Transposon mutagenesis screen in vivo; siRNA knockdown; chromatin fractionation; DNA damage repair assays; PARP inhibitor synthetic lethality in cell lines and mouse models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide in vivo screen, chromatin fractionation, synthetic lethality confirmed in multiple systems\",\n      \"pmids\": [\"35022408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SENP6-mediated deSUMOylation of ANXA1 in microglia targets the IKK complex and selectively inhibits autophagic degradation of IKKα in an NBR1-dependent manner, activating the NF-κB pathway and enhancing proinflammatory cytokine expression after ischemic stroke.\",\n      \"method\": \"Co-immunoprecipitation; AAV-mediated SENP6 knockdown in microglia in vivo; immunoblot; MCAO mouse model\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with in vivo AAV knockdown, single lab\",\n      \"pmids\": [\"35869493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SENP6 deconjugates SUMO2/3 polymers from a group of DNA damage response proteins (BRCA1-BARD1, 53BP1, BLM, ERCC1-XPF), maintaining them in a hypo-SUMOylated state. SENP6 depletion causes uncoordinated recruitment of these proteins at DNA damage sites and accumulation of SUMO2/3 and DDR proteins in PML-independent nuclear condensates driven by multivalent SUMO-SIM interactions. Co-depletion with RNF4 further increases SUMOylation of BRCA1, BARD1, and BLM.\",\n      \"method\": \"Quantitative proteomics; live-cell imaging at laser-induced damage sites; Co-depletion epistasis with RNF4; immunofluorescence of nuclear bodies\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomic substrate identification, genetic epistasis with RNF4, live-cell imaging, multiple orthogonal methods\",\n      \"pmids\": [\"37735495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SENP6 depletion causes hyperSUMOylation of lamin A/C family proteins, leading to nuclear structural changes resembling laminopathies. Proximity-induced SUMO modification (PISM) directly targeting lamin A/C for SUMO conjugation recapitulates the altered nuclear structure, establishing a direct causal link between lamin SUMOylation and nuclear morphology defects.\",\n      \"method\": \"Proteomic identification of SENP6 substrates; PISM (DARPin-fused SUMO E3 ligase domain) to directly SUMOylate lamin A/C; immunofluorescence of nuclear structure\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — novel proximity-based tool with functional reconstitution of phenotype, orthogonal proteomic substrate identification\",\n      \"pmids\": [\"37556322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SENP6 mediates deSUMOylation of VEGFR2, reducing its accumulation in the Golgi and promoting its transport to the cell membrane surface via COPB2 (coatomer protein complex subunit beta 2), enhancing VEGF-VEGFR2 signaling and angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence; immunoblotting in HUVECs\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP and immunofluorescence, single lab, single method set\",\n      \"pmids\": [\"36768878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SENP6 constitutively interacts with USP8 and deSUMOylates USP8, which restricts the interaction between USP8 and IFNAR2. Reduced USP8-IFNAR2 interaction enhances IFNAR2 ubiquitination and degradation, thereby attenuating type I IFN signaling and antiviral activity.\",\n      \"method\": \"Co-immunoprecipitation; SUMOylation assay; IFNAR2 ubiquitination assay; siRNA knockdown\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ubiquitination assays, mechanistic pathway placement; single lab\",\n      \"pmids\": [\"38906982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SENP6 binds to and mediates deSUMOylation of Nrf2, which promotes ubiquitination-dependent proteasomal degradation of Nrf2, reducing its transcriptional activity and exacerbating oxidative stress after ischemic stroke. A cell-permeable peptide (Tat-Nrf2) blocking SENP6-Nrf2 interaction preserves Nrf2 SUMOylation and reduces neuronal damage.\",\n      \"method\": \"Co-immunoprecipitation; in vitro deSUMOylation assay; ubiquitination assay; cell-permeable inhibitory peptide; MCAO mouse model\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, in vitro deSUMOylation, peptide inhibitor in vivo; single lab\",\n      \"pmids\": [\"39716997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SENP6 interacts with PINK1 and reduces SUMO2-ylation of PINK1, thereby enhancing mitophagy and promoting temozolomide resistance in glioma cells.\",\n      \"method\": \"RNA sequencing; Co-immunoprecipitation; SUMOylation assay; siRNA knockdown\",\n      \"journal\": \"Molekuliarnaia biologiia\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP and SUMOylation assay, single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"38062972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SENP6 deSUMOylates TOM40 to maintain TOM complex assembly and mitochondrial protein import. SENP6 knockdown causes TOM40 SUMOylation, impairing TOM complex assembly and mitochondrial protein import, leading to loss of mitochondrial proteostasis, morphology, and function. CCCP treatment decreases mitochondrial SENP6, and TOM40 SUMOylation is increased in Alzheimer's disease mouse brains.\",\n      \"method\": \"SENP6 knockdown; Co-immunoprecipitation; SUMOylation assay; TOM complex blue native PAGE; mitochondrial import assay; fractionation\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple assays (Co-IP, SUMOylation, import assay, BN-PAGE), single lab\",\n      \"pmids\": [\"40729740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"SENP6 interacts with and deSUMOylates NLRP3 at Lys-23, Lys-204, and Lys-689. DeSUMOylation by SENP6 enables K48-linked polyubiquitination of NLRP3 by the E3 ligase MARCHF7 (recruited by SENP6), leading to autophagy-lysosomal degradation of NLRP3 and suppression of inflammasome activation.\",\n      \"method\": \"Co-immunoprecipitation; site-directed mutagenesis (K23R, K204R, K689R); NLRP3 ubiquitination assay; SENP6 knockdown in macrophages; in vivo LPS and alum models\",\n      \"journal\": \"Research (Washington, D.C.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis identifying deSUMOylation sites, Co-IP with E3 ligase, in vivo validation; single lab\",\n      \"pmids\": [\"41531891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"SENP6 deSUMOylates SMAD5, leading to SMAD5 protein instability; SENP6 knockdown stabilizes SMAD5, which directly activates SOX2 transcription to promote early osteogenic commitment of periodontal ligament stem cells.\",\n      \"method\": \"Co-immunoprecipitation; siRNA knockdown; luciferase transcriptional reporter; SENP6 inhibitor (NSC632839) in vivo calvarial osteolysis model; micro-CT\",\n      \"journal\": \"European journal of medical research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, Co-IP and KD with phenotype but limited biochemical mechanistic depth\",\n      \"pmids\": [\"41618460\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SENP6 is a nucleoplasmic SUMO-2/3-preferring isopeptidase with an N-terminal multi-SIM domain that targets it to poly-SUMO chains; its catalytic Loop1 insertion confers specificity for SUMO2/3 polymers, enabling it to act as a group deSUMOylase that maintains the hypo-SUMOylated, chromatin-associated state of functionally interconnected protein complexes including inner kinetochore components (CCAN/CENP-I), cohesin, DNA damage response factors (BRCA1-BARD1, 53BP1, BLM), and nuclear lamins, while also deSUMOylating signaling proteins such as NEMO (dampening NF-κB), TRIM28 (suppressing p53), NLRP3, VEGFR2, USP8, and Nrf2, thereby broadly coordinating genome stability, chromosome segregation, nuclear architecture, innate immune signaling, and mitochondrial homeostasis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SENP6 is a nucleoplasmic SUMO-2/3-preferring cysteine protease that functions as a group deSUMOylase, maintaining the hypo-SUMOylated state of functionally interconnected chromatin-associated protein complexes to coordinate genome stability, chromosome segregation, nuclear architecture, and innate immune signaling. Its catalytic domain contains a unique Loop1 insertion that confers specificity for poly-SUMO2/3 chains, and its N-terminal multi-SIM domain targets it to poly-SUMOylated substrates [PMID:21878624, PMID:31597105]. By antagonizing poly-SUMO2/3 accumulation on inner kinetochore components (CENP-H/I/K, CENP-T/W/A), cohesin, DNA damage response factors (BRCA1-BARD1, 53BP1, BLM), and nuclear lamins, SENP6 prevents RNF4-mediated proteasomal degradation or aberrant condensate formation, thereby preserving centromere integrity, DNA repair competence, and nuclear morphology [PMID:20212317, PMID:37735495, PMID:37556322]. SENP6 also deSUMOylates signaling regulators including NEMO to dampen NF-κB activation, TRIM28 to suppress p53, NLRP3 to promote its autophagic degradation, and TOM40 to maintain mitochondrial protein import [PMID:23825957, PMID:29321472, PMID:41531891, PMID:40729740].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing SENP6 as a SUMO-specific cysteine protease resolved its biochemical identity: the His/Asp/Cys catalytic triad cleaves SUMO-1 from conjugated substrates with specificity over other ubiquitin-like modifiers.\",\n      \"evidence\": \"In vitro cleavage of SUMO-1–β-galactosidase fusion in E. coli with mutagenic validation; GFP-fusion localization in NIH3T3 and HeLa cells\",\n      \"pmids\": [\"10799485\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Initial localization to cytoplasm was later revised to nucleoplasm\", \"SUMO-2/3 paralog preference not yet tested\", \"No endogenous substrates identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrating that SENP6 preferentially cleaves poly-SUMO2/3 chains rather than SUMO-1, and that its depletion causes PML body enlargement via SUMO2/3 accumulation, established its in vivo substrate specificity and functional niche as a poly-SUMO2/3 chain editor in the nucleoplasm.\",\n      \"evidence\": \"siRNA depletion with vinyl sulfone SUMO-paralog inhibitors, EGFP-SUMO live-cell imaging, and model poly-SUMO substrate assays\",\n      \"pmids\": [\"17000875\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for SUMO2/3 preference not yet defined\", \"Endogenous substrate repertoire unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Biochemical and structural analysis revealed that SENP6 (and SENP7) possess unique catalytic domain features—including Loop1—that confer efficient poly-SUMO2/3 deconjugation while rendering them poor at SUMO precursor processing, distinguishing them from other SENP family members.\",\n      \"evidence\": \"Crystal structure of SENP7 catalytic domain at 2.4 Å; in vitro cleavage assays with di- and poly-SUMO substrates; structure-guided mutagenesis\",\n      \"pmids\": [\"18799455\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SENP6 catalytic domain structure not directly solved\", \"Loop1-SUMO interface not yet visualized at atomic resolution\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showing that SENP6 is essential for inner kinetochore assembly—by preventing poly-SUMO-dependent RNF4-mediated degradation of CENP-H/I/K—established the first cellular process requiring SENP6 chain-editing activity and linked deSUMOylation to chromosome segregation fidelity.\",\n      \"evidence\": \"siRNA depletion with immunofluorescence of kinetochore composition; epistasis with RNF4 knockdown; proteasome inhibitor rescue\",\n      \"pmids\": [\"20212317\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which SENP6 is recruited to centromeric chromatin unresolved\", \"Direct deSUMOylation of CENP-I not biochemically reconstituted\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defining the Loop1 insertion as the structural determinant of SUMO2/3 specificity—and showing that SUMO surface mutations swap isoform preference—resolved how SENP6/7 achieve paralog-selective poly-chain editing at a molecular level.\",\n      \"evidence\": \"Structure-guided mutagenesis of Loop1; in vitro proteolytic assays with chimeric SENP and SUMO isoform substrates\",\n      \"pmids\": [\"21878624\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full SENP6 crystal structure still lacking\", \"Contribution of non-catalytic domains to substrate targeting not addressed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identifying NEMO/IKKγ Lys-277 as a SENP6 deSUMOylation site that controls CYLD binding established a direct mechanism by which SENP6 dampens NF-κB signaling downstream of TLRs, extending its role to innate immune regulation.\",\n      \"evidence\": \"Co-IP, K277 mutagenesis, NF-κB luciferase reporter, epistasis with CYLD, in vivo sepsis model\",\n      \"pmids\": [\"23825957\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SENP6 regulation of NEMO is stimulus-specific unknown\", \"Regulation of SENP6 itself in immune signaling unexplored\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The crystal structure of a SENP2-Loop1 chimera in complex with SUMO2 directly visualized the Loop1-SUMO interface, confirming that this insertion creates an extended binding surface that enhances poly-SUMO2 processing.\",\n      \"evidence\": \"X-ray crystallography at 2.15 Å; in vitro cleavage assays with diSUMO2 and polySUMO2\",\n      \"pmids\": [\"24424631\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Native SENP6 catalytic domain structure not solved\", \"How Loop1 accommodates branched SUMO chains unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrating that SENP6 stabilizes TRIM28 via deSUMOylation to suppress p53 in osteochondroprogenitors—with genetic rescue by Trp53 loss in knockout mice—provided the first in vivo genetic evidence linking SENP6 catalytic activity to a specific developmental signaling pathway.\",\n      \"evidence\": \"Conditional knockout mouse; Co-IP; in vitro deSUMOylation; Senp6−/−;Trp53−/− epistasis; histological phenotyping\",\n      \"pmids\": [\"29321472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SENP6 controls p53 in other tissues unknown\", \"Direct TRIM28 deSUMOylation sites not mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Quantitative SUMO proteomics after SENP6 depletion identified >180 hyper-SUMOylated substrates—including CCAN components, CENP-A loading factors, cohesin, and DNA repair proteins—revealing SENP6 as a group deSUMOylase that maintains the hypo-SUMOylated state of functionally interconnected chromatin-associated complexes, with effects partly independent of proteasomal degradation.\",\n      \"evidence\": \"Quantitative SUMO proteomics; immunofluorescence; cell cycle analysis; proteasome inhibitor epistasis; domain mapping identifying N-terminal multi-SIM domain; hPSO4/PRP19 complex identification by MS; chromatin fractionation\",\n      \"pmids\": [\"31485003\", \"31597105\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SENP6 acts co-translationally or post-assembly on chromatin complexes unclear\", \"Signal that recruits SENP6 to specific chromatin loci unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"An in vivo transposon screen identified SENP6 loss as a driver of chromosomal instability in lymphoma by releasing genome maintenance complexes from chromatin, and demonstrated synthetic lethality with PARP inhibition, establishing therapeutic relevance.\",\n      \"evidence\": \"Transposon mutagenesis screen; chromatin fractionation; DNA repair assays; PARP inhibitor synthetic lethality in cell lines and mouse models\",\n      \"pmids\": [\"35022408\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biomarker strategy for patient selection not developed\", \"Whether specific SENP6 mutations occur in human lymphomas not addressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showing that SENP6 depletion causes DDR proteins (BRCA1-BARD1, 53BP1, BLM) to accumulate in PML-independent SUMO-SIM-driven nuclear condensates explained the mechanistic basis of impaired DNA repair: uncontrolled poly-SUMOylation drives phase separation that sequesters repair factors away from damage sites.\",\n      \"evidence\": \"Quantitative proteomics; live-cell imaging at laser-induced damage sites; RNF4 co-depletion epistasis; immunofluorescence\",\n      \"pmids\": [\"37735495\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether condensate formation is reversible upon SENP6 re-expression untested\", \"Biophysical characterization of SUMO-SIM condensates lacking\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Directly SUMOylating lamin A/C via a proximity-induced tool (PISM) recapitulated nuclear morphology defects seen upon SENP6 loss, establishing that lamin deSUMOylation by SENP6 is causally required for normal nuclear architecture.\",\n      \"evidence\": \"Proteomic substrate identification; DARPin-fused SUMO E3 proximity tool targeting lamin A/C; immunofluorescence\",\n      \"pmids\": [\"37556322\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Lamin SUMOylation sites not mapped\", \"Downstream consequences for gene expression or mechanotransduction not explored\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of USP8 and Nrf2 as SENP6 substrates extended SENP6's regulatory reach to type I interferon signaling (via USP8-IFNAR2 axis) and oxidative stress defense (via Nrf2 stability), revealing its role as a signaling rheostat beyond chromatin biology.\",\n      \"evidence\": \"Co-IP, SUMOylation/ubiquitination assays for USP8-IFNAR2; in vitro deSUMOylation and cell-permeable inhibitory peptide for Nrf2; MCAO model\",\n      \"pmids\": [\"38906982\", \"39716997\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"USP8 and Nrf2 findings each from single labs\", \"Physiological relevance of SENP6-USP8 axis in viral infection not validated in vivo\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating that SENP6 deSUMOylates TOM40 to maintain TOM complex assembly and mitochondrial protein import established a role for SENP6 in mitochondrial proteostasis, with disease relevance suggested by increased TOM40 SUMOylation in Alzheimer's disease mouse brains.\",\n      \"evidence\": \"SENP6 knockdown; Co-IP; BN-PAGE for TOM complex assembly; mitochondrial import assay; subcellular fractionation\",\n      \"pmids\": [\"40729740\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab finding\", \"Whether SENP6 acts at the outer mitochondrial membrane or in the cytosol unclear\", \"Causal role in Alzheimer's pathogenesis not established\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Mapping SENP6-dependent deSUMOylation of NLRP3 at three lysine residues, and showing this licenses MARCHF7-mediated ubiquitination and autophagic degradation, defined a complete SUMO-to-ubiquitin switch mechanism by which SENP6 suppresses inflammasome activation.\",\n      \"evidence\": \"Co-IP; K23R/K204R/K689R mutagenesis; ubiquitination assay; macrophage knockdown; in vivo LPS and alum models\",\n      \"pmids\": [\"41531891\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Whether this mechanism operates in human inflammasome-driven diseases untested\", \"MARCHF7 recruitment mechanism by SENP6 not fully defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the full-length SENP6 structure, how SENP6 is recruited to specific chromatin loci and signaling complexes, what regulates SENP6 abundance and activity under stress, and whether its group deSUMOylase function can be therapeutically targeted.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length SENP6 structure available\", \"Post-translational regulation of SENP6 itself largely unexplored\", \"No selective SENP6 inhibitors reported\", \"Relative contributions of proteasomal vs. condensate-mediated pathology upon SENP6 loss not quantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 3, 5, 6, 7, 8, 9, 10, 15, 16, 18, 19, 21, 22]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 3, 6, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [1, 2, 5, 11, 15, 16]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [4, 10, 11, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 10, 11, 13]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [11, 13, 15]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 14, 18, 22]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [10, 11, 15, 16]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 3, 6, 9]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [14, 22]}\n    ],\n    \"complexes\": [\n      \"hPSO4/PRP19 complex\"\n    ],\n    \"partners\": [\n      \"NEMO\",\n      \"TRIM28\",\n      \"NLRP3\",\n      \"TOM40\",\n      \"USP8\",\n      \"CENP-I\",\n      \"PINK1\",\n      \"NRF2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}