{"gene":"SENP1","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":2003,"finding":"SENP1 contains a nuclear localization signal in its N-terminus required for nuclear accumulation; mutation of this NLS causes cytoplasmic accumulation. The N-terminus also regulates protease activity, as expression of the core catalytic domain alone leads to constitutive activity. SENP1 is a cysteine protease (key catalytic cysteine required); a catalytic-dead mutant (C→A) acts as dominant negative, accumulating high-MW SUMO-1 conjugates. SENP1 itself can be SUMO-1 modified, and its localization is influenced by SUMO-1-conjugated target proteins.","method":"NLS mutation/cytoplasmic localization assay, dominant-negative catalytic mutant expression, immunofluorescence, co-localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — mutagenesis of catalytic residue and NLS with direct phenotypic readouts, multiple orthogonal methods","pmids":["14563852"],"is_preprint":false},{"year":2004,"finding":"SENP1 enhances androgen receptor (AR)-dependent transcription not by deSUMOylating AR itself, but by deSUMOylating HDAC1, thereby reducing HDAC1 deacetylase activity. RNAi depletion of HDAC1 reduces SENP1's transcriptional effect, placing HDAC1 deSUMOylation downstream of SENP1 in AR coactivation.","method":"Immunoprecipitation, transcriptional reporter assays, RNA interference, deSUMOylation assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — epistasis via RNAi, biochemical deSUMOylation assay, multiple orthogonal methods","pmids":["15199155"],"is_preprint":false},{"year":2005,"finding":"Purified SENP1 catalytic domain processes all three SUMO precursors (SUMO-1, -2, -3) in vitro; SUMO-1 is the preferred substrate. The C-terminal residues immediately after the 'GG' motif of SUMO precursors, including two specific residues, determine differential maturation efficiency.","method":"In vitro protease assay with purified recombinant proteins, mutagenesis of SUMO precursors","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro with mutagenesis defining substrate determinants","pmids":["15487983"],"is_preprint":false},{"year":2005,"finding":"Mouse SENP1 knockout causes increased global SUMO conjugation and placental defects leading to embryonic lethality, establishing that SENP1-mediated deSUMOylation is essential for mammalian development.","method":"Retroviral insertional mutation/knockout mouse, western blot for SUMO conjugates, histology","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined developmental phenotype and biochemical readout","pmids":["15923632"],"is_preprint":false},{"year":2005,"finding":"SENP1 deSUMOylates HIPK2 both in vitro and in cells. SENP1 shuttles between cytoplasm and nucleus via a nuclear export sequence (NES) in its C-terminus; forced nuclear localization of SENP1 or NES mutation enhances HIPK2 deSUMOylation and dissociation of HIPK2 from nuclear bodies.","method":"In vitro deSUMOylation assay, NES mutant, co-immunoprecipitation, fluorescence microscopy","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro assay plus cellular localization experiments with mutagenesis","pmids":["16253240"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of SENP1 catalytic domain mutant C603S in complex with SUMO-1 resolved at 2.8 Å. The active-site cysteine (C603) is essential; C603S is catalytically inactive. Structure reveals a conformational change (self-conformational change) required prior to cleavage. Four unique SENP1 residues at the SUMO-1 interface determine substrate binding specificity. SENP1 can also hydrolyze the thioester linkage in E1-SUMO and E2-SUMO complexes.","method":"X-ray crystallography, in vitro maturation/deconjugation assay, active-site mutagenesis","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with catalytic mutant and in vitro functional validation","pmids":["16712526"],"is_preprint":false},{"year":2008,"finding":"SENP1 specifically deconjugates SUMO from HIPK1 in vitro and in vivo. In resting endothelial cells, SENP1 resides in the cytoplasm complexed with thioredoxin. TNF induces ROS-dependent release of SENP1 from thioredoxin and nuclear translocation of SENP1, correlating with HIPK1 deSUMOylation and cytoplasmic translocation of HIPK1, leading to ASK1-JNK activation and apoptosis.","method":"In vitro deSUMOylation assay, co-immunoprecipitation (SENP1-thioredoxin complex), siRNA knockdown, SENP1-KO MEFs, nuclear fractionation","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro deSUMOylation, KO cells, reciprocal Co-IP, multiple orthogonal methods","pmids":["18219322"],"is_preprint":false},{"year":2008,"finding":"SENP1 (and SENP2) efficiently cleave AR-SUMO-1 conjugates in vitro and in intact cells; only agonist-bound AR is efficiently SUMOylated; SENP1 coactivating effect on AR transcription requires intact SUMO acceptor sites in AR and catalytic activity of SENP1, indicating direct deSUMOylation of AR mediates coactivation on compound ARE-containing promoters.","method":"In vitro deSUMOylation assay, reporter assay, siRNA, immunoprecipitation","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro assay plus epistasis through acceptor-site mutations and catalytic mutants","pmids":["19116244"],"is_preprint":false},{"year":2008,"finding":"IL-6 induces SENP1 mRNA expression; SENP1 deSUMOylates PML, disrupting PML nuclear bodies; wild-type but not catalytically inactive SENP1 reverses PML-mediated suppression of STAT3 activation.","method":"RT-PCR, immunoprecipitation/co-immunoprecipitation, STAT3 reporter assay, catalytic mutant","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 — catalytic mutant epistasis but single lab, limited orthogonal methods","pmids":["18474224"],"is_preprint":false},{"year":2010,"finding":"SENP1 knockout mice develop anemia and die between E13.5 and P1 due to erythropoiesis defects in fetal liver. SENP1 directly deSUMOylates GATA1 in vitro, and GATA1 SUMOylation reduces its DNA binding and recruitment to GATA1-responsive promoters, demonstrating SENP1 promotes GATA1-dependent erythropoiesis.","method":"Cre-loxP knockout mice, bone marrow transplant, in vitro deSUMOylation assay, ChIP, flow cytometry","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1–2 — KO mouse with defined phenotype, in vitro biochemical assay, ChIP confirming mechanism","pmids":["20457756"],"is_preprint":false},{"year":2010,"finding":"SENP1 is induced by hypoxia in endothelial cells via HIF-1α binding to an HRE on the SENP1 promoter (ChIP, HRE mutation). SENP1 knockdown reduces VEGF production and abrogates angiogenic function. SENP1-deficient mouse embryos show reduced endothelial cells in brain and kidney, establishing a HIF-1α→SENP1→VEGF positive feedback loop in angiogenesis.","method":"ChIP, HRE promoter mutagenesis, siRNA knockdown, SENP1-null mouse embryo analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including ChIP, promoter mutation, KO mouse","pmids":["20841360"],"is_preprint":false},{"year":2010,"finding":"SENP1 overexpression in rheumatoid arthritis synovial fibroblasts decreases histone H4 acetylation at the MMP-1 promoter distal region and leads to accumulation of HDAC4 on that promoter. SENP1-mediated reduction of MMP-1 expression requires HDAC4; siRNA silencing of HDAC4 abolishes SENP1's effect on MMP-1.","method":"ChIP, HDAC4 siRNA epistasis, overexpression, invasion assay","journal":"Journal of autoimmunity","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis via siRNA, ChIP, functional invasion readout; single lab","pmids":["20079608"],"is_preprint":false},{"year":2010,"finding":"SENP1 overexpression in a mouse prostate model stabilizes HIF-1α (by deSUMOylation), increases VEGF and angiogenesis, and promotes androgen receptor-dependent cell proliferation via cyclin D1, inducing high-grade prostatic intraepithelial neoplasia.","method":"Transgenic mouse model, immunoprecipitation, IHC, cell proliferation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — transgenic mouse model with mechanistic biochemistry, multiple readouts","pmids":["20551310"],"is_preprint":false},{"year":2012,"finding":"SENP1 deficiency promotes ER stress-induced apoptosis by increasing SUMOylation of the spliced XBP1 (XBP1s), reducing XBP1 target gene expression. SENP1 is identified as a specific deSUMOylating protease for XBP1.","method":"SENP1-KO cells, co-immunoprecipitation, transcriptional reporter, apoptosis assay","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 — KO cells with defined phenotype and Co-IP; single lab","pmids":["22370484"],"is_preprint":false},{"year":2012,"finding":"Nup153 binds SENP1 (and SENP2) at the nuclear pore complex via distinct sites in the N-terminal and C-terminal domains of Nup153. RNAi depletion or dominant-negative mutants of SENP1/SENP2 increase sumoylation of Nup153, identifying Nup153 as an endogenous SUMO substrate controlled by SENP1 at the NPC.","method":"Co-immunoprecipitation, RNAi, dominant-negative mutants, sumoylation assay","journal":"Nucleus","confidence":"Medium","confidence_rationale":"Tier 2–3 — reciprocal pulldowns plus functional RNAi; single lab","pmids":["22688647"],"is_preprint":false},{"year":2013,"finding":"SENP1 binds to and deSUMOylates Pin1 at K6 (WW domain) and K63 (PPIase domain). Pin1 SUMOylation inhibits its isomerase activity and oncogenic function; SENP1-mediated deSUMOylation restores Pin1 activity and promotes centrosome amplification and cell transformation. SENP1 also stabilizes Pin1 protein.","method":"Co-immunoprecipitation, in vitro deSUMOylation assay, site-directed mutagenesis, functional transformation assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro biochemistry, mutagenesis of SUMOylation sites, functional rescue","pmids":["23633483"],"is_preprint":false},{"year":2013,"finding":"SENP1 and SENP2 localize to kinetochores during mitosis. SENP1 knockdown delays sister chromatid separation at metaphase, while SENP2 knockdown produces no detectable phenotype. Altered SENP1 kinetochore association phenocopies SENP2 overexpression-induced chromosome congression defect, demonstrating SENP1 controls temporal deSUMOylation required for chromosome segregation.","method":"RNAi knockdown, live-cell imaging, immunofluorescence, chromosome segregation assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — clean KD with defined mitotic phenotype, epistasis between SENP1 and SENP2","pmids":["24048451"],"is_preprint":false},{"year":2013,"finding":"SENP1 and SENP2 co-depletion causes mislocalization and reduced levels of multiple nucleoporins, revealing a role for pore-associated SENPs in nucleoporin homeostasis and NPC configuration.","method":"RNAi co-depletion, immunofluorescence, western blot, transport kinetics assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — co-depletion with functional transport assay; single lab","pmids":["24196834"],"is_preprint":false},{"year":2014,"finding":"NMR relaxation and chemical shift perturbation show that the β-grasp domain of SUMO1 binding to an exosite of SENP1 allosterically activates the protease by inducing structural changes ~20 Å away at the active site, including conformational changes involving the 'lid' residue Trp465 and quenching nanosecond dynamics.","method":"NMR relaxation measurements, chemical shift perturbation, enzyme kinetics","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — structural NMR with enzyme kinetics and mutagenesis-informed analysis","pmids":["25263960"],"is_preprint":false},{"year":2014,"finding":"SENP1 regulates mitochondrial biogenesis and cardiac function by deSUMOylating MEF-2C, enhancing MEF-2C-mediated PGC-1α transcription. Cardiac SENP1 expression is induced by hypertrophic stimuli via calcineurin-NFAT3 signaling. Genetic induction of SENP1 in cardiomyocytes leads to mitochondrial dysregulation and cardiac dysfunction.","method":"Transgenic mouse model, co-immunoprecipitation, ChIP, reporter assay","journal":"Journal of molecular and cellular cardiology","confidence":"Medium","confidence_rationale":"Tier 2 — transgenic model with mechanistic biochemistry; single lab","pmids":["25446185"],"is_preprint":false},{"year":2014,"finding":"SENP1 protects against myocardial ischemia/reperfusion injury via a HIF-1α-dependent pathway; SENP1+/- mice show larger infarct size and impaired systolic function after I/R; overexpression of HIF-1α reverses the effect of SENP1 knockdown.","method":"SENP1+/- mouse, coronary artery ligation, HIF-1α overexpression rescue, echocardiography","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic mouse model with epistasis rescue experiment; single lab","pmids":["25082844"],"is_preprint":false},{"year":2015,"finding":"SENP1 deSUMOylates GATA1 to promote definitive erythropoiesis; islet-specific Senp1 deletion causes impaired glucose tolerance by reducing amplification of insulin exocytosis; the ICDc pathway generates NADPH/GSH which activates SENP1 to amplify insulin secretion at the distal exocytotic site.","method":"Islet-specific KO mice, patch-clamp exocytosis assay, metabolite supplementation, human islet studies","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — islet-specific KO, electrophysiology (exocytosis), metabolite rescue, human T2D islets","pmids":["26389676"],"is_preprint":false},{"year":2015,"finding":"Adipocyte-specific deletion of SENP1 leads to enhanced SUMOylation of NEMO (NF-κB essential modulator) at K277/K309, increasing NF-κB activity and proinflammatory cytokine production, causing pancreatic inflammation and type-1 diabetes-like phenotype.","method":"Adipocyte-specific conditional KO, co-immunoprecipitation for NEMO SUMOylation, NF-κB reporter, NF-κB inhibitor rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific KO with mechanistic biochemistry identifying K277/K309 SUMOylation sites, multiple orthogonal methods","pmids":["26596471"],"is_preprint":false},{"year":2016,"finding":"SENP1 promotes HIF-1α stability by deSUMOylating HIF-1α; HIF-1α transcriptionally induces SENP1 expression via hypoxia response elements, forming a positive feedback loop. In HCC cells under hypoxia, this SENP1/HIF-1α loop enhances cancer stemness.","method":"Immunoprecipitation for HIF-1α SUMOylation, ChIP for HIF-1/2α on SENP1 HRE, shRNA knockdown, xenograft","journal":"Gut","confidence":"High","confidence_rationale":"Tier 2 — ChIP, Co-IP, loss-of-function, in vivo; replicated across multiple cancer contexts","pmids":["28258134"],"is_preprint":false},{"year":2016,"finding":"SENP1 deSUMOylates GATA1 and Bcl-xL in erythroid progenitors from chronic mountain sickness (CMS) subjects; manipulating SENP1 levels in iPSC-derived erythroid cells converts CMS to non-CMS erythropoietic phenotype and vice versa, with GATA1 identified as essential downstream target.","method":"iPSC technology, lentiviral SENP1 modulation, erythropoiesis assay, western blot","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — bidirectional manipulation with phenotypic rescue, human cell system","pmids":["27821551"],"is_preprint":false},{"year":2016,"finding":"Allosteric activation of SENP1 by the β-grasp domain of SUMO1 involves a 'dock-and-coalesce' mechanism: β-grasp domain wedges the exosite cleft, enabling docking of the SUMO C-terminus proximal portion and strengthening cross-channel motional coupling that allows the distal portion to coalesce around the catalytic center.","method":"Molecular dynamics simulation (validated against NMR data from prior structural work)","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 1 computational + prior experimental NMR data; single computational study","pmids":["27576863"],"is_preprint":false},{"year":2016,"finding":"SENP1 modulates sumoylation of RB and Lamin A/C; SUMO1 conjugation of both RB and Lamin A/C is required for their interaction; SENP1 deSUMOylation disrupts this complex; SUMO1-dependent RB-Lamin A/C complex protects both proteins from proteasomal degradation.","method":"Co-immunoprecipitation, proteasome inhibitor experiments, SUMO-site mutagenesis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP and mutagenesis showing SUMOylation-dependent interaction; single lab","pmids":["27270425"],"is_preprint":false},{"year":2017,"finding":"SENP1 deSUMOylates NEMO (via SENP1 de-SUMOylation of NEMO at K277/309) to regulate PTP1B SUMOylation status. In SENP1-deficient macrophages, SUMOylated PTP1B has reduced ability to de-phosphorylate STAT3, causing elevated STAT3 activity which suppresses STAT1 via SOCS3 induction, impairing IFN-γ/STAT1 signaling and M1 macrophage activation.","method":"SENP1-KO macrophages, co-immunoprecipitation, phospho-western, infection assay","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — KO cells with mechanistic biochemistry; single lab","pmids":["27702761"],"is_preprint":false},{"year":2017,"finding":"SENP1 localizes to the nuclear pore complex (NPC) via interaction with Nup153; tethering SENP1 to NPCs in Nup153-depleted cells restores SENP1-dependent SUMO1 modification of 53BP1, which is a prerequisite for efficient 53BP1 accumulation at DNA double-strand breaks and NHEJ repair.","method":"Artificial tethering of SENP1 to NPC, RNAi depletion, DSB repair assay, 53BP1 SUMO modification assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — artificial tethering rescue experiment with functional DSB repair readout","pmids":["28576968"],"is_preprint":false},{"year":2017,"finding":"SENP1 participates in Elk-1 deSUMOylation; among SENPs, Elk-1 preferentially forms a complex with SENP1 (co-IP); SENP1 is the most efficient at promoting Elk-1 transactivation; SENP1 depletion reduces c-FOS target gene activation; SENP1 and SENP2 show partial redundancy in Elk-1 deSUMOylation.","method":"Co-immunoprecipitation, RNAi knockdown, combinatorial knockdown, reporter assay, ChIP","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP + RNAi epistasis; single lab","pmids":["20337593"],"is_preprint":false},{"year":2018,"finding":"SENP1 interacts with and deSUMOylates c-Myc in cells and in vitro; wild-type but not catalytically inactive C603S SENP1 stabilizes c-Myc. SENP1-mediated deSUMOylation reduces c-Myc polyubiquitination and promotes monoubiquitinated c-Myc and its phosphorylation at S62/T58, indicating SUMOylation promotes c-Myc proteasomal degradation.","method":"Co-immunoprecipitation, in vitro deSUMOylation assay, catalytic mutant, ubiquitination assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro deSUMOylation, catalytic mutant, ubiquitination cross-talk analysis","pmids":["30305424"],"is_preprint":false},{"year":2018,"finding":"SENP1 deSUMOylates KLF15 under hypoxia, causing its translocation from nucleus to cytoplasm; nuclear KLF15 directly suppresses Arg2 (arginase 2) transcription in pulmonary endothelial cells; hypoxia-triggered KLF15 deSUMOylation by SENP1 releases Arg2 expression and impairs NO production.","method":"ChIP for KLF15 on Arg2 promoter, immunofluorescence for KLF15 localization, SENP1 overexpression, arginase activity assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus localization experiment with functional vascular readout; single lab","pmids":["29472234"],"is_preprint":false},{"year":2018,"finding":"Streptonigrin binds SENP1 at the SUMO-binding surface (exosite), disrupting SENP1-SUMO1 interaction; NMR chemical shift perturbation identified key aromatic π-stacking residues involved in binding; cell treatment increases global SUMOylation and reduces HIF-1α levels.","method":"NMR chemical shift perturbation, site-directed mutagenesis, cell-based SUMOylation assay","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — NMR binding site identification with mutagenesis confirmation","pmids":["29481054"],"is_preprint":false},{"year":2019,"finding":"Sirt3 is SUMOylated in mitochondria; SUMOylation suppresses Sirt3 deacetylase activity. During fasting, SENP1 translocates into mitochondria and deSUMOylates Sirt3, activating its deacetylase activity, leading to decreased mitochondrial protein acetylation and increased fatty acid oxidation. SENP1 deficiency causes hyper-SUMOylation of Sirt3, hyper-acetylation of mitochondrial proteins, and impaired metabolic adaptation.","method":"Co-immunoprecipitation, in vitro deSUMOylation assay, subcellular fractionation, SENP1-KO mice, Sirt3 KR mutation, metabolic phenotyping","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro assay, KO mice, SUMOylation-deficient mutant, mitochondrial fractionation; multiple orthogonal methods","pmids":["31302001"],"is_preprint":false},{"year":2019,"finding":"SENP1 deSUMOylates USP28; under hypoxia, HIF-1α activates SENP1 which then deSUMOylates USP28, increasing USP28 deubiquitinase activity toward HIF-1α, amplifying HIF-1α accumulation in a positive feedback loop.","method":"Co-immunoprecipitation, GST pulldown, in vitro deSUMOylation assay, luciferase reporter","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 — biochemical assays with functional reporter; single lab","pmids":["30622440"],"is_preprint":false},{"year":2020,"finding":"SENP1 deSUMOylates IDOL (an E3 ubiquitin ligase for LDLR) at K293; SUMOylation of IDOL counteracts its auto-ubiquitination and increases IDOL stability. SENP1-mediated deSUMOylation reduces IDOL levels, increasing LDLR protein levels and LDL uptake; loss of SENP1 lowers LDLR in an IDOL-dependent manner.","method":"Co-immunoprecipitation, site-directed mutagenesis (K293), SENP1 KD, LDL uptake assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — SUMOylation site mutagenesis, IDOL-dependent epistasis, functional LDL uptake readout","pmids":["33154164"],"is_preprint":false},{"year":2021,"finding":"SENP1 promotes T cell memory development through Sirt3 deSUMOylation in mitochondria. SENP1-Sirt3 axis promotes OXPHOS and mitochondrial fusion by deacetylating mitochondrial metalloprotease YME1L1, suppressing OPA1 cleavage. Fructose-1,6-bisphosphate (FBP) negatively regulates AMPK-mediated SENP1-Sirt3 activation.","method":"T cell-specific KO, co-immunoprecipitation, mitochondrial fractionation, acetylation assay, mitochondrial morphology imaging","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — T cell-specific KO, biochemical pathway dissection, multiple orthogonal methods","pmids":["34272364"],"is_preprint":false},{"year":2021,"finding":"SENP1 deficiency in neurons leads to increased SUMOylation and degradation of FMRP; re-introducing SENP1 or FMRP specifically in the retrosplenial agranular (RSA) cortex rescues synaptic function defects and autistic-like symptoms in Senp1+/- mice.","method":"Conditional heterozygous mice, stereotactic rescue (viral SENP1/FMRP expression), electrophysiology, behavioral tests","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — in vivo rescue with regional specificity, electrophysiology, behavioral readouts","pmids":["34731627"],"is_preprint":false},{"year":2021,"finding":"β-cell SENP1 is required for incretin (GLP-1/GIP)-stimulated insulin exocytosis downstream of cAMP/Ca2+ signaling; β-cell-specific SENP1 KO mice develop oral glucose intolerance on HFD with impaired β-cell exocytosis to incretin receptor agonists without changes in cAMP or Ca2+ levels.","method":"β-cell-specific KO, patch-clamp exocytosis, insulin secretion assay, oral vs. IV glucose tolerance","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 — β-cell-specific KO with electrophysiology, downstream of signaling dissection","pmids":["34462260"],"is_preprint":false},{"year":2021,"finding":"JAK2 is SUMOylated; SENP1 directly interacts with and deSUMOylates JAK2, causing JAK2 cytoplasmic accumulation and activation. This SENP1/JAK2 axis is activated in platinum-resistant ovarian cancer via RUNX2 transcription factor; SENP1 inhibition overcomes platinum resistance.","method":"Co-immunoprecipitation, subcellular fractionation, deSUMOylation assay, RUNX2 ChIP, drug resistance assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, localization, functional resistance assay; single lab","pmids":["33795649"],"is_preprint":false},{"year":2022,"finding":"SENP1 deSUMOylates RIPK1 within the TNF receptor signaling complex (TNF-RSC), keeping RIPK1 kinase activity in check. SENP1 deficiency promotes RIPK1 SUMOylation, re-orchestrates TNF-RSC, and alters RIPK1 ubiquitination patterns to activate RIPK1-dependent apoptosis and NASH progression.","method":"Hepatocyte-specific SENP1-KO mice, Co-immunoprecipitation of TNF-RSC, SUMOylation/ubiquitination assay, RIPK1 kinase inhibitor rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific KO, biochemical complex analysis, kinase-inhibitor rescue; multiple orthogonal methods","pmids":["36414671"],"is_preprint":false},{"year":2022,"finding":"SENP1-Sirt3 signaling controls glutaminolysis for α-ketoglutarate (αKG) production during IL-4-stimulated M2 macrophage polarization. SENP1 deSUMOylates and activates Sirt3, which in turn deacetylates GLUD1 (glutamate dehydrogenase 1) to increase its activity, promoting αKG accumulation and Jmjd3-dependent H3K27me3 demethylation.","method":"Co-immunoprecipitation, deSUMOylation and deacetylation assays, GLUD1 activity assay, metabolomics","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 — biochemical cascade reconstitution, activity assays, metabolomics; single lab but multiple methods","pmids":["35417703"],"is_preprint":false},{"year":2022,"finding":"SENP1 is identified as a specific deSUMOylase for KLF4; SENP1-KLF4 axis promotes M1 macrophage polarization by affecting NF-κB signaling; SUMOylation-deficient KLF4 macrophages exert anti-tumor activity.","method":"Co-immunoprecipitation, deSUMOylation assay, NF-κB reporter, macrophage polarization assay","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP and functional polarization assay; single lab","pmids":["35942612"],"is_preprint":false},{"year":2023,"finding":"SUMOylated RNF168 undergoes liquid-liquid phase separation (LLPS), restricting its recruitment to DNA damage sites. SENP1 deSUMOylates RNF168, preventing LLPS and promoting RNF168 recruitment to DNA damage sites, RNF168-catalyzed H2A ubiquitination, and 53BP1-dependent NHEJ repair.","method":"Co-immunoprecipitation, in vitro phase separation assay, deSUMOylation assay, NHEJ repair assay, H2A ubiquitination assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro phase separation, deSUMOylation assay, functional DNA repair readout","pmids":["37350666"],"is_preprint":false},{"year":2023,"finding":"SENP1 deSUMOylates MAVS; poly-SUMOylation of MAVS (mediated by PIAS3) promotes MAVS K63-linked polyubiquitination, aggregation, and liquid-liquid phase separation through a SUMO-interacting motif (SIM) in MAVS. IRF3 is recruited to SUMOylated MAVS droplets via a SIM in IRF3; IRF3 phosphorylation at residues adjacent to this SIM releases activated IRF3 from MAVS condensates.","method":"Co-immunoprecipitation, in vitro phase separation assay, SIM mutagenesis, IRF3 phosphorylation analysis, antiviral reporter assay","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro reconstitution of phase separation, SIM mutagenesis, mechanistic dissection of MAVS-IRF3 interaction","pmids":["37188808"],"is_preprint":false},{"year":2023,"finding":"Hydrogen sulfide (H2S) S-sulfhydrates SENP1 at C683, increasing its activity, which then deSUMOylates SERCA2a to increase its expression and activity, improving calcium homeostasis and cardiac function in diabetic cardiomyopathy. SENP1 C683A mutation blocks H2S-induced SERCA2a SUMOylation regulation.","method":"S-sulfhydration assay, co-immunoprecipitation, SENP1 C683A mutant, SERCA2a activity assay, in vivo diabetic model","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 — PTM-site mutant with functional cardiac readout; single lab","pmids":["36750014"],"is_preprint":false},{"year":2024,"finding":"Redox sensing by SENP1 in β-cells is mediated by a thiol at C535; together with Zn2+-binding, C535 suppresses basal protease activity. A reduced cytosolic redox state (as occurs after 2-day high-fat diet) relieves this suppression and activates SENP1-dependent insulin exocytosis. Pancreas/β-cell-specific SENP1 KO mice fail to up-regulate exocytosis and become rapidly glucose intolerant.","method":"β-cell-specific KO, C535 mutagenesis, redox manipulation, patch-clamp exocytosis, in vivo glucose tolerance","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — active-site mutagenesis identifying redox-sensing cysteine, KO mouse, electrophysiology","pmids":["38184650"],"is_preprint":false},{"year":2024,"finding":"SENP1 deSUMOylates HSP90ab1 in cardiomyocytes; HSP90ab1 SUMOylation at K72 activates STAT3 and promotes fibronectin secretion, driving fibroblast activation and cardiac fibrosis after MI. SENP1 overexpression or HSP90ab1 K72 mutation ameliorates adverse ventricular remodeling.","method":"Cardiomyocyte-specific KO and overexpression mice, co-immunoprecipitation, K72 mutation, MI model, cardiac fibrosis assay","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 — tissue-specific KO/OE with mechanistic biochemistry; single lab","pmids":["38992961"],"is_preprint":false}],"current_model":"SENP1 is a nuclear/mitochondrial cysteine-family SUMO-specific isopeptidase that processes SUMO precursors and deconjugates SUMO-1/-2/-3 from a broad range of substrates—including HIF-1α, GATA1, Sirt3, c-Myc, RIPK1, MAVS, RNF168, JAK2, HDAC1, AR, Pin1, NEMO, and many others—thereby controlling transcription, metabolism, DNA repair, apoptosis, immune signaling, and mitochondrial function; its catalytic activity requires C603 (human), is allosterically activated by the β-grasp domain of SUMO binding at an exosite ~20 Å from the active site, is redox-regulated through C535 in β-cells, and can be post-translationally regulated by S-sulfhydration, with subcellular localization governed by an N-terminal NLS, a C-terminal NES, and interactions with nuclear pore complex components such as Nup153."},"narrative":{"teleology":[{"year":2003,"claim":"Establishing SENP1 as a catalytically active SUMO protease with regulated nuclear localization answered the basic question of how this protease is organized: it requires C603 for activity, contains an N-terminal NLS for nuclear targeting, and its N-terminus auto-inhibits the catalytic domain.","evidence":"NLS mutagenesis, catalytic-dead C→A mutant expression, immunofluorescence in mammalian cells","pmids":["14563852"],"confidence":"High","gaps":["Structural basis of N-terminal autoinhibition not defined","Relative contributions of NLS vs. NES to steady-state localization not dissected"]},{"year":2004,"claim":"Demonstrating that SENP1 coactivates androgen receptor transcription indirectly—by deSUMOylating HDAC1 rather than AR itself—established the principle that SENP1 controls transcription through chromatin-modifying intermediates.","evidence":"Co-IP, transcriptional reporter assays, HDAC1 RNAi epistasis","pmids":["15199155"],"confidence":"High","gaps":["Whether SENP1 can also directly deSUMOylate AR was unresolved at this stage","Identity of other HDAC family members regulated by SENP1 unknown"]},{"year":2005,"claim":"Biochemical reconstitution and mouse knockout together established that SENP1 processes all three SUMO paralog precursors with preference for SUMO-1, and that its loss causes embryonic lethality due to global SUMO hyperconjugation.","evidence":"In vitro protease assays with purified proteins and SUMO precursor mutagenesis; retroviral insertional KO mouse with placental defects","pmids":["15487983","15923632"],"confidence":"High","gaps":["Specific substrates responsible for placental lethality not identified","Redundancy with other SENPs in vivo not quantified"]},{"year":2006,"claim":"The 2.8 Å crystal structure of SENP1 C603S–SUMO-1 revealed the active-site architecture, a required conformational change preceding cleavage, and four interface residues determining SUMO paralog specificity, providing the first structural framework for SENP1 catalysis.","evidence":"X-ray crystallography, in vitro maturation/deconjugation assays, active-site mutagenesis","pmids":["16712526"],"confidence":"High","gaps":["Full-length structure including N-terminal regulatory domain unavailable","Structural basis for isopeptidase vs. endopeptidase preference not resolved"]},{"year":2008,"claim":"Discovery that TNF-induced ROS releases SENP1 from a cytoplasmic thioredoxin complex, triggering its nuclear translocation and HIPK1 deSUMOylation leading to ASK1-JNK-mediated apoptosis, established redox-regulated SENP1 shuttling as a signaling mechanism.","evidence":"In vitro deSUMOylation, reciprocal Co-IP for SENP1–thioredoxin, SENP1-KO MEFs, nuclear fractionation","pmids":["18219322"],"confidence":"High","gaps":["Molecular detail of SENP1–thioredoxin interaction not structurally characterized","Whether other oxidative stimuli use the same release mechanism unknown"]},{"year":2010,"claim":"SENP1 knockout mice die of anemia due to impaired fetal liver erythropoiesis: SENP1 deSUMOylates GATA1 to restore its DNA-binding capacity at erythroid promoters, identifying the first essential developmental substrate axis for SENP1.","evidence":"Cre-loxP KO mice, bone marrow transplant, in vitro deSUMOylation, ChIP, flow cytometry","pmids":["20457756"],"confidence":"High","gaps":["Whether GATA1 is the sole critical erythroid substrate not excluded","Post-natal erythropoietic role of SENP1 not addressed"]},{"year":2010,"claim":"Identification of a HIF-1α→SENP1→HIF-1α positive feedback loop—where HIF-1α transcriptionally induces SENP1, and SENP1 deSUMOylates and stabilizes HIF-1α—explained how hypoxic signaling is amplified in angiogenesis and later in cancer.","evidence":"ChIP for HIF-1α on SENP1 HRE, promoter mutagenesis, siRNA, SENP1-null embryo analysis; transgenic prostate model with IHC","pmids":["20841360","20551310"],"confidence":"High","gaps":["How the loop is terminated or counter-regulated is unknown","Whether SENP1 deSUMOylates HIF-2α with equal efficiency not tested"]},{"year":2013,"claim":"SENP1 localizes to kinetochores during mitosis and its depletion delays sister chromatid separation, revealing a cell-cycle-specific function beyond interphase transcription regulation.","evidence":"RNAi, live-cell imaging, immunofluorescence, chromosome segregation assay","pmids":["24048451"],"confidence":"High","gaps":["Kinetochore substrates of SENP1 not identified","Mechanism of SENP1 kinetochore recruitment unknown"]},{"year":2014,"claim":"NMR relaxation experiments revealed that the β-grasp domain of SUMO allosterically activates SENP1 by binding an exosite ~20 Å from the catalytic center, quenching nanosecond dynamics and restructuring the lid residue Trp465—providing a biophysical mechanism for substrate-assisted catalysis.","evidence":"NMR relaxation and chemical shift perturbation, enzyme kinetics; subsequent MD simulations describing 'dock-and-coalesce' mechanism","pmids":["25263960","27576863"],"confidence":"High","gaps":["Whether allosteric activation differs for SUMO-2/3 vs. SUMO-1 not tested by NMR","Full kinetic model including N-terminal domain absent"]},{"year":2015,"claim":"Tissue-specific knockouts revealed that SENP1 controls insulin exocytosis in β-cells (via NADPH/GSH-dependent activation) and restrains NF-κB in adipocytes (by deSUMOylating NEMO at K277/K309), linking SENP1 to metabolic disease and diabetes.","evidence":"Islet-specific and adipocyte-specific KO mice, patch-clamp exocytosis, NF-κB reporter, metabolite supplementation, human T2D islets","pmids":["26389676","26596471"],"confidence":"High","gaps":["Identity of β-cell exocytotic SUMO substrates not determined at this stage","Whether adipocyte NEMO is the sole relevant substrate for inflammatory phenotype unknown"]},{"year":2017,"claim":"Demonstration that SENP1 is tethered to the nuclear pore complex via Nup153 and that this localization is required for SUMO1-dependent 53BP1 recruitment to DNA double-strand breaks connected SENP1 to the DNA damage response pathway.","evidence":"Artificial tethering rescue of SENP1 at NPC in Nup153-depleted cells, DSB repair assay, 53BP1 SUMO modification assay","pmids":["28576968"],"confidence":"High","gaps":["Whether SENP1 directly deSUMOylates 53BP1 or acts on an intermediate is unclear","Role of SENP1 in HR vs. NHEJ pathway choice not resolved"]},{"year":2018,"claim":"Showing that SENP1 deSUMOylates c-Myc to switch its ubiquitination pattern from poly- to mono-ubiquitination and stabilize the oncoprotein established SUMO-ubiquitin cross-talk as a key SENP1-regulated mechanism in oncogenesis.","evidence":"Co-IP, in vitro deSUMOylation, C603S catalytic mutant, ubiquitination assay","pmids":["30305424"],"confidence":"High","gaps":["Which E3 ligase generates the SUMO-dependent polyubiquitin chain on c-Myc not identified","In vivo tumor model validation lacking"]},{"year":2019,"claim":"Discovery that SENP1 translocates into mitochondria during fasting to deSUMOylate Sirt3 and activate fatty acid oxidation expanded SENP1's functional compartment beyond the nucleus and identified a SENP1–Sirt3 metabolic axis.","evidence":"Mitochondrial fractionation, in vitro deSUMOylation, Sirt3 KR mutant, SENP1-KO mice, metabolic phenotyping","pmids":["31302001"],"confidence":"High","gaps":["Mitochondrial import mechanism for SENP1 not characterized","Whether mitochondrial SENP1 has substrates beyond Sirt3 unknown"]},{"year":2021,"claim":"The SENP1–Sirt3 axis was extended to T cell immunology: SENP1 promotes T memory cell development by activating Sirt3-dependent OXPHOS and mitochondrial fusion through YME1L1 deacetylation, integrating metabolic and immune functions.","evidence":"T cell-specific KO, mitochondrial fractionation, acetylation assay, mitochondrial morphology imaging","pmids":["34272364"],"confidence":"High","gaps":["Whether other immune cell lineages require SENP1–Sirt3 axis not tested","Upstream signals triggering mitochondrial SENP1 translocation in T cells not defined"]},{"year":2022,"claim":"Hepatocyte-specific SENP1 deletion showed that SENP1 restrains RIPK1-dependent apoptosis by deSUMOylating RIPK1 within the TNF receptor signaling complex, preventing NASH progression—the first link of SENP1 to death receptor complex regulation.","evidence":"Hepatocyte-specific KO, Co-IP of TNF-RSC, SUMOylation/ubiquitination assay, RIPK1 kinase inhibitor rescue","pmids":["36414671"],"confidence":"High","gaps":["SUMOylation sites on RIPK1 not mapped","Whether SENP1 also regulates necroptosis through RIPK1/RIPK3/MLKL not tested"]},{"year":2023,"claim":"Two studies revealed that SENP1 counteracts SUMO-driven liquid-liquid phase separation: it prevents SUMOylated RNF168 from forming condensates that sequester it away from DNA damage sites, and it opposes PIAS3-mediated poly-SUMOylation of MAVS that drives MAVS aggregation for IRF3 recruitment during antiviral signaling.","evidence":"In vitro phase separation reconstitution for both RNF168 and MAVS, SIM mutagenesis, NHEJ repair and antiviral reporter assays","pmids":["37350666","37188808"],"confidence":"High","gaps":["Whether SENP1 regulation of phase separation extends to other substrates is unknown","Kinetics of SENP1-mediated condensate dissolution not measured"]},{"year":2024,"claim":"Identification of C535 as a redox-sensing thiol in SENP1 that, together with Zn²⁺ binding, suppresses basal protease activity in β-cells provided the first molecular mechanism for how metabolic redox changes directly activate SENP1-dependent insulin exocytosis.","evidence":"C535 mutagenesis, redox manipulation, β-cell-specific KO, patch-clamp exocytosis, in vivo glucose tolerance","pmids":["38184650"],"confidence":"High","gaps":["Whether C535 redox regulation operates in non-β-cell contexts unknown","Structural basis of Zn²⁺-mediated inhibition at C535 not resolved"]},{"year":null,"claim":"Key unresolved questions include: the mechanism of SENP1 mitochondrial import, whether allosteric activation differs among SUMO paralogs, the full-length structure including the N-terminal regulatory domain, and how SENP1 activity is terminated to prevent excessive deSUMOylation.","evidence":"","pmids":[],"confidence":"High","gaps":["Full-length SENP1 structure unavailable","Mitochondrial targeting signal/import pathway not identified","Counter-regulatory mechanisms limiting SENP1 activity undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,5,7,9,15,30,33,40,43,44]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,2,5,46]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,4,6,16]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,6]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[33,36]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[16]},{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[14,17,28]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,2,5,9,15,30,33,40,43,44]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,7,8,10,29,31]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[28,43]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[16]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[22,27,36,42,44]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,9,24]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[6,40]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,12,23,34,39,44]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[33,35,41]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[33,36]}],"complexes":[],"partners":["SUMO1","NUP153","GATA1","SIRT3","HDAC1","HIF1A","RIPK1","RNF168"],"other_free_text":[]},"mechanistic_narrative":"SENP1 is a SUMO-specific cysteine protease that processes SUMO-1/-2/-3 precursors and deconjugates SUMO from a broad array of substrates, thereby controlling transcription, erythropoiesis, metabolism, DNA repair, immune signaling, and mitochondrial function. Its catalytic activity depends on C603 and is allosterically activated by the β-grasp domain of SUMO binding an exosite ~20 Å from the active site, with additional regulation by redox sensing at C535 in β-cells and S-sulfhydration at C683 [PMID:16712526, PMID:25263960, PMID:38184650, PMID:36750014]. SENP1 shuttles between nucleus and cytoplasm via an N-terminal NLS and a C-terminal NES, localizes to kinetochores during mitosis, associates with the nuclear pore complex through Nup153, and translocates into mitochondria during fasting to activate Sirt3-dependent fatty acid oxidation and T cell memory formation [PMID:14563852, PMID:16253240, PMID:24048451, PMID:22688647, PMID:31302001, PMID:34272364]. Mouse knockouts demonstrate that SENP1 is essential for embryonic development, definitive erythropoiesis through GATA1 deSUMOylation, incretin-stimulated insulin exocytosis in β-cells, and hepatocyte survival by restraining RIPK1-dependent apoptosis [PMID:15923632, PMID:20457756, PMID:26389676, PMID:34462260, PMID:36414671]."},"prefetch_data":{"uniprot":{"accession":"Q9P0U3","full_name":"Sentrin-specific protease 1","aliases":["Sentrin/SUMO-specific protease SENP1"],"length_aa":644,"mass_kda":73.5,"function":"Protease that catalyzes two essential functions in the SUMO pathway (PubMed:10652325, PubMed:15199155, PubMed:15487983, PubMed:16253240, PubMed:16553580, PubMed:21829689, PubMed:21965678, PubMed:23160374, PubMed:24943844, PubMed:25406032, PubMed:29506078, PubMed:34048572, PubMed:37257451). 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:15487983). 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:15199155, PubMed:16253240, PubMed:21829689, PubMed:21965678, PubMed:23160374, PubMed:24943844, PubMed:25406032, PubMed:29506078, PubMed:34048572, PubMed:37257451). Deconjugates SUMO1 from HIPK2 (PubMed:16253240). Deconjugates SUMO1 from HDAC1 and BHLHE40/DEC1, which decreases its transcriptional repression activity (PubMed:15199155, PubMed:21829689). Deconjugates SUMO1 from CLOCK, which decreases its transcriptional activation activity (PubMed:23160374). Deconjugates SUMO2 from MTA1 (PubMed:21965678). Inhibits N(6)-methyladenosine (m6A) RNA methylation by mediating SUMO1 deconjugation from METTL3 and ALKBH5: METTL3 inhibits the m6A RNA methyltransferase activity, while ALKBH5 desumoylation promotes m6A demethylation (PubMed:29506078, PubMed:34048572, PubMed:37257451). Desumoylates CCAR2 which decreases its interaction with SIRT1 (PubMed:25406032). Deconjugates SUMO1 from GPS2 (PubMed:24943844)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9P0U3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SENP1","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/SENP1","total_profiled":1310},"omim":[{"mim_id":"617842","title":"PROTEASOME 26S SUBUNIT, NON-ATPase, 1; PSMD1","url":"https://www.omim.org/entry/617842"},{"mim_id":"616182","title":"CHRONIC MOUNTAIN SICKNESS, SUSCEPTIBILITY TO","url":"https://www.omim.org/entry/616182"},{"mim_id":"615708","title":"ZINC FINGER PROTEIN 451; ZNF451","url":"https://www.omim.org/entry/615708"},{"mim_id":"612845","title":"SENTRIN-SPECIFIC PROTEASE FAMILY, MEMBER 5; SENP5","url":"https://www.omim.org/entry/612845"},{"mim_id":"612157","title":"SENTRIN-SPECIFIC PROTEASE FAMILY, MEMBER 1; SENP1","url":"https://www.omim.org/entry/612157"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Focal adhesion sites","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"salivary gland","ntpm":30.5},{"tissue":"testis","ntpm":57.7}],"url":"https://www.proteinatlas.org/search/SENP1"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9P0U3","domains":[{"cath_id":"3.40.395.10","chopping":"426-641","consensus_level":"medium","plddt":95.6322,"start":426,"end":641}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P0U3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P0U3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P0U3-F1-predicted_aligned_error_v6.png","plddt_mean":60.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SENP1","jax_strain_url":"https://www.jax.org/strain/search?query=SENP1"},"sequence":{"accession":"Q9P0U3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9P0U3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9P0U3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P0U3"}},"corpus_meta":[{"pmid":"28258134","id":"PMC_28258134","title":"SENP1 promotes hypoxia-induced cancer stemness by HIF-1α deSUMOylation and SENP1/HIF-1α positive feedback loop.","date":"2017","source":"Gut","url":"https://pubmed.ncbi.nlm.nih.gov/28258134","citation_count":191,"is_preprint":false},{"pmid":"31302001","id":"PMC_31302001","title":"SENP1-Sirt3 Signaling Controls Mitochondrial Protein Acetylation and Metabolism.","date":"2019","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/31302001","citation_count":189,"is_preprint":false},{"pmid":"26389676","id":"PMC_26389676","title":"Isocitrate-to-SENP1 signaling amplifies insulin secretion and rescues dysfunctional β cells.","date":"2015","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/26389676","citation_count":156,"is_preprint":false},{"pmid":"15199155","id":"PMC_15199155","title":"SENP1 enhances androgen receptor-dependent transcription through desumoylation of histone deacetylase 1.","date":"2004","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15199155","citation_count":156,"is_preprint":false},{"pmid":"14563852","id":"PMC_14563852","title":"Characterization of the localization and proteolytic activity of the SUMO-specific protease, SENP1.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14563852","citation_count":151,"is_preprint":false},{"pmid":"34272364","id":"PMC_34272364","title":"Glucose limitation activates AMPK coupled SENP1-Sirt3 signalling in mitochondria for T cell memory development.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34272364","citation_count":124,"is_preprint":false},{"pmid":"35417703","id":"PMC_35417703","title":"SENP1-Sirt3 signaling promotes α-ketoglutarate production during M2 macrophage polarization.","date":"2022","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/35417703","citation_count":101,"is_preprint":false},{"pmid":"15923632","id":"PMC_15923632","title":"Mutation of SENP1/SuPr-2 reveals an essential role for desumoylation in mouse development.","date":"2005","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15923632","citation_count":89,"is_preprint":false},{"pmid":"19116244","id":"PMC_19116244","title":"SUMO-specific protease 1 (SENP1) reverses the hormone-augmented SUMOylation of androgen receptor and modulates gene responses in prostate cancer cells.","date":"2008","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/19116244","citation_count":87,"is_preprint":false},{"pmid":"20551310","id":"PMC_20551310","title":"SENP1 induces prostatic intraepithelial neoplasia through multiple mechanisms.","date":"2010","source":"The Journal of biological 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autoimmunity","url":"https://pubmed.ncbi.nlm.nih.gov/20079608","citation_count":68,"is_preprint":false},{"pmid":"18219322","id":"PMC_18219322","title":"SENP1 mediates TNF-induced desumoylation and cytoplasmic translocation of HIPK1 to enhance ASK1-dependent apoptosis.","date":"2008","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/18219322","citation_count":64,"is_preprint":false},{"pmid":"27449295","id":"PMC_27449295","title":"Momordin Ic, a new natural SENP1 inhibitor, inhibits prostate cancer cell proliferation.","date":"2016","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/27449295","citation_count":62,"is_preprint":false},{"pmid":"36414671","id":"PMC_36414671","title":"SENP1 prevents steatohepatitis by suppressing RIPK1-driven apoptosis and inflammation.","date":"2022","source":"Nature 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The N-terminus also regulates protease activity, as expression of the core catalytic domain alone leads to constitutive activity. SENP1 is a cysteine protease (key catalytic cysteine required); a catalytic-dead mutant (C→A) acts as dominant negative, accumulating high-MW SUMO-1 conjugates. SENP1 itself can be SUMO-1 modified, and its localization is influenced by SUMO-1-conjugated target proteins.\",\n      \"method\": \"NLS mutation/cytoplasmic localization assay, dominant-negative catalytic mutant expression, immunofluorescence, co-localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mutagenesis of catalytic residue and NLS with direct phenotypic readouts, multiple orthogonal methods\",\n      \"pmids\": [\"14563852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SENP1 enhances androgen receptor (AR)-dependent transcription not by deSUMOylating AR itself, but by deSUMOylating HDAC1, thereby reducing HDAC1 deacetylase activity. RNAi depletion of HDAC1 reduces SENP1's transcriptional effect, placing HDAC1 deSUMOylation downstream of SENP1 in AR coactivation.\",\n      \"method\": \"Immunoprecipitation, transcriptional reporter assays, RNA interference, deSUMOylation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — epistasis via RNAi, biochemical deSUMOylation assay, multiple orthogonal methods\",\n      \"pmids\": [\"15199155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Purified SENP1 catalytic domain processes all three SUMO precursors (SUMO-1, -2, -3) in vitro; SUMO-1 is the preferred substrate. The C-terminal residues immediately after the 'GG' motif of SUMO precursors, including two specific residues, determine differential maturation efficiency.\",\n      \"method\": \"In vitro protease assay with purified recombinant proteins, mutagenesis of SUMO precursors\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro with mutagenesis defining substrate determinants\",\n      \"pmids\": [\"15487983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mouse SENP1 knockout causes increased global SUMO conjugation and placental defects leading to embryonic lethality, establishing that SENP1-mediated deSUMOylation is essential for mammalian development.\",\n      \"method\": \"Retroviral insertional mutation/knockout mouse, western blot for SUMO conjugates, histology\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined developmental phenotype and biochemical readout\",\n      \"pmids\": [\"15923632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SENP1 deSUMOylates HIPK2 both in vitro and in cells. SENP1 shuttles between cytoplasm and nucleus via a nuclear export sequence (NES) in its C-terminus; forced nuclear localization of SENP1 or NES mutation enhances HIPK2 deSUMOylation and dissociation of HIPK2 from nuclear bodies.\",\n      \"method\": \"In vitro deSUMOylation assay, NES mutant, co-immunoprecipitation, fluorescence microscopy\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro assay plus cellular localization experiments with mutagenesis\",\n      \"pmids\": [\"16253240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of SENP1 catalytic domain mutant C603S in complex with SUMO-1 resolved at 2.8 Å. The active-site cysteine (C603) is essential; C603S is catalytically inactive. Structure reveals a conformational change (self-conformational change) required prior to cleavage. Four unique SENP1 residues at the SUMO-1 interface determine substrate binding specificity. SENP1 can also hydrolyze the thioester linkage in E1-SUMO and E2-SUMO complexes.\",\n      \"method\": \"X-ray crystallography, in vitro maturation/deconjugation assay, active-site mutagenesis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with catalytic mutant and in vitro functional validation\",\n      \"pmids\": [\"16712526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SENP1 specifically deconjugates SUMO from HIPK1 in vitro and in vivo. In resting endothelial cells, SENP1 resides in the cytoplasm complexed with thioredoxin. TNF induces ROS-dependent release of SENP1 from thioredoxin and nuclear translocation of SENP1, correlating with HIPK1 deSUMOylation and cytoplasmic translocation of HIPK1, leading to ASK1-JNK activation and apoptosis.\",\n      \"method\": \"In vitro deSUMOylation assay, co-immunoprecipitation (SENP1-thioredoxin complex), siRNA knockdown, SENP1-KO MEFs, nuclear fractionation\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro deSUMOylation, KO cells, reciprocal Co-IP, multiple orthogonal methods\",\n      \"pmids\": [\"18219322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SENP1 (and SENP2) efficiently cleave AR-SUMO-1 conjugates in vitro and in intact cells; only agonist-bound AR is efficiently SUMOylated; SENP1 coactivating effect on AR transcription requires intact SUMO acceptor sites in AR and catalytic activity of SENP1, indicating direct deSUMOylation of AR mediates coactivation on compound ARE-containing promoters.\",\n      \"method\": \"In vitro deSUMOylation assay, reporter assay, siRNA, immunoprecipitation\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro assay plus epistasis through acceptor-site mutations and catalytic mutants\",\n      \"pmids\": [\"19116244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"IL-6 induces SENP1 mRNA expression; SENP1 deSUMOylates PML, disrupting PML nuclear bodies; wild-type but not catalytically inactive SENP1 reverses PML-mediated suppression of STAT3 activation.\",\n      \"method\": \"RT-PCR, immunoprecipitation/co-immunoprecipitation, STAT3 reporter assay, catalytic mutant\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — catalytic mutant epistasis but single lab, limited orthogonal methods\",\n      \"pmids\": [\"18474224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SENP1 knockout mice develop anemia and die between E13.5 and P1 due to erythropoiesis defects in fetal liver. SENP1 directly deSUMOylates GATA1 in vitro, and GATA1 SUMOylation reduces its DNA binding and recruitment to GATA1-responsive promoters, demonstrating SENP1 promotes GATA1-dependent erythropoiesis.\",\n      \"method\": \"Cre-loxP knockout mice, bone marrow transplant, in vitro deSUMOylation assay, ChIP, flow cytometry\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — KO mouse with defined phenotype, in vitro biochemical assay, ChIP confirming mechanism\",\n      \"pmids\": [\"20457756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SENP1 is induced by hypoxia in endothelial cells via HIF-1α binding to an HRE on the SENP1 promoter (ChIP, HRE mutation). SENP1 knockdown reduces VEGF production and abrogates angiogenic function. SENP1-deficient mouse embryos show reduced endothelial cells in brain and kidney, establishing a HIF-1α→SENP1→VEGF positive feedback loop in angiogenesis.\",\n      \"method\": \"ChIP, HRE promoter mutagenesis, siRNA knockdown, SENP1-null mouse embryo analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including ChIP, promoter mutation, KO mouse\",\n      \"pmids\": [\"20841360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SENP1 overexpression in rheumatoid arthritis synovial fibroblasts decreases histone H4 acetylation at the MMP-1 promoter distal region and leads to accumulation of HDAC4 on that promoter. SENP1-mediated reduction of MMP-1 expression requires HDAC4; siRNA silencing of HDAC4 abolishes SENP1's effect on MMP-1.\",\n      \"method\": \"ChIP, HDAC4 siRNA epistasis, overexpression, invasion assay\",\n      \"journal\": \"Journal of autoimmunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via siRNA, ChIP, functional invasion readout; single lab\",\n      \"pmids\": [\"20079608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SENP1 overexpression in a mouse prostate model stabilizes HIF-1α (by deSUMOylation), increases VEGF and angiogenesis, and promotes androgen receptor-dependent cell proliferation via cyclin D1, inducing high-grade prostatic intraepithelial neoplasia.\",\n      \"method\": \"Transgenic mouse model, immunoprecipitation, IHC, cell proliferation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — transgenic mouse model with mechanistic biochemistry, multiple readouts\",\n      \"pmids\": [\"20551310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SENP1 deficiency promotes ER stress-induced apoptosis by increasing SUMOylation of the spliced XBP1 (XBP1s), reducing XBP1 target gene expression. SENP1 is identified as a specific deSUMOylating protease for XBP1.\",\n      \"method\": \"SENP1-KO cells, co-immunoprecipitation, transcriptional reporter, apoptosis assay\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO cells with defined phenotype and Co-IP; single lab\",\n      \"pmids\": [\"22370484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Nup153 binds SENP1 (and SENP2) at the nuclear pore complex via distinct sites in the N-terminal and C-terminal domains of Nup153. RNAi depletion or dominant-negative mutants of SENP1/SENP2 increase sumoylation of Nup153, identifying Nup153 as an endogenous SUMO substrate controlled by SENP1 at the NPC.\",\n      \"method\": \"Co-immunoprecipitation, RNAi, dominant-negative mutants, sumoylation assay\",\n      \"journal\": \"Nucleus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — reciprocal pulldowns plus functional RNAi; single lab\",\n      \"pmids\": [\"22688647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SENP1 binds to and deSUMOylates Pin1 at K6 (WW domain) and K63 (PPIase domain). Pin1 SUMOylation inhibits its isomerase activity and oncogenic function; SENP1-mediated deSUMOylation restores Pin1 activity and promotes centrosome amplification and cell transformation. SENP1 also stabilizes Pin1 protein.\",\n      \"method\": \"Co-immunoprecipitation, in vitro deSUMOylation assay, site-directed mutagenesis, functional transformation assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro biochemistry, mutagenesis of SUMOylation sites, functional rescue\",\n      \"pmids\": [\"23633483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SENP1 and SENP2 localize to kinetochores during mitosis. SENP1 knockdown delays sister chromatid separation at metaphase, while SENP2 knockdown produces no detectable phenotype. Altered SENP1 kinetochore association phenocopies SENP2 overexpression-induced chromosome congression defect, demonstrating SENP1 controls temporal deSUMOylation required for chromosome segregation.\",\n      \"method\": \"RNAi knockdown, live-cell imaging, immunofluorescence, chromosome segregation assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined mitotic phenotype, epistasis between SENP1 and SENP2\",\n      \"pmids\": [\"24048451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SENP1 and SENP2 co-depletion causes mislocalization and reduced levels of multiple nucleoporins, revealing a role for pore-associated SENPs in nucleoporin homeostasis and NPC configuration.\",\n      \"method\": \"RNAi co-depletion, immunofluorescence, western blot, transport kinetics assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-depletion with functional transport assay; single lab\",\n      \"pmids\": [\"24196834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NMR relaxation and chemical shift perturbation show that the β-grasp domain of SUMO1 binding to an exosite of SENP1 allosterically activates the protease by inducing structural changes ~20 Å away at the active site, including conformational changes involving the 'lid' residue Trp465 and quenching nanosecond dynamics.\",\n      \"method\": \"NMR relaxation measurements, chemical shift perturbation, enzyme kinetics\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural NMR with enzyme kinetics and mutagenesis-informed analysis\",\n      \"pmids\": [\"25263960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SENP1 regulates mitochondrial biogenesis and cardiac function by deSUMOylating MEF-2C, enhancing MEF-2C-mediated PGC-1α transcription. Cardiac SENP1 expression is induced by hypertrophic stimuli via calcineurin-NFAT3 signaling. Genetic induction of SENP1 in cardiomyocytes leads to mitochondrial dysregulation and cardiac dysfunction.\",\n      \"method\": \"Transgenic mouse model, co-immunoprecipitation, ChIP, reporter assay\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transgenic model with mechanistic biochemistry; single lab\",\n      \"pmids\": [\"25446185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SENP1 protects against myocardial ischemia/reperfusion injury via a HIF-1α-dependent pathway; SENP1+/- mice show larger infarct size and impaired systolic function after I/R; overexpression of HIF-1α reverses the effect of SENP1 knockdown.\",\n      \"method\": \"SENP1+/- mouse, coronary artery ligation, HIF-1α overexpression rescue, echocardiography\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic mouse model with epistasis rescue experiment; single lab\",\n      \"pmids\": [\"25082844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SENP1 deSUMOylates GATA1 to promote definitive erythropoiesis; islet-specific Senp1 deletion causes impaired glucose tolerance by reducing amplification of insulin exocytosis; the ICDc pathway generates NADPH/GSH which activates SENP1 to amplify insulin secretion at the distal exocytotic site.\",\n      \"method\": \"Islet-specific KO mice, patch-clamp exocytosis assay, metabolite supplementation, human islet studies\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — islet-specific KO, electrophysiology (exocytosis), metabolite rescue, human T2D islets\",\n      \"pmids\": [\"26389676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Adipocyte-specific deletion of SENP1 leads to enhanced SUMOylation of NEMO (NF-κB essential modulator) at K277/K309, increasing NF-κB activity and proinflammatory cytokine production, causing pancreatic inflammation and type-1 diabetes-like phenotype.\",\n      \"method\": \"Adipocyte-specific conditional KO, co-immunoprecipitation for NEMO SUMOylation, NF-κB reporter, NF-κB inhibitor rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with mechanistic biochemistry identifying K277/K309 SUMOylation sites, multiple orthogonal methods\",\n      \"pmids\": [\"26596471\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SENP1 promotes HIF-1α stability by deSUMOylating HIF-1α; HIF-1α transcriptionally induces SENP1 expression via hypoxia response elements, forming a positive feedback loop. In HCC cells under hypoxia, this SENP1/HIF-1α loop enhances cancer stemness.\",\n      \"method\": \"Immunoprecipitation for HIF-1α SUMOylation, ChIP for HIF-1/2α on SENP1 HRE, shRNA knockdown, xenograft\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP, Co-IP, loss-of-function, in vivo; replicated across multiple cancer contexts\",\n      \"pmids\": [\"28258134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SENP1 deSUMOylates GATA1 and Bcl-xL in erythroid progenitors from chronic mountain sickness (CMS) subjects; manipulating SENP1 levels in iPSC-derived erythroid cells converts CMS to non-CMS erythropoietic phenotype and vice versa, with GATA1 identified as essential downstream target.\",\n      \"method\": \"iPSC technology, lentiviral SENP1 modulation, erythropoiesis assay, western blot\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation with phenotypic rescue, human cell system\",\n      \"pmids\": [\"27821551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Allosteric activation of SENP1 by the β-grasp domain of SUMO1 involves a 'dock-and-coalesce' mechanism: β-grasp domain wedges the exosite cleft, enabling docking of the SUMO C-terminus proximal portion and strengthening cross-channel motional coupling that allows the distal portion to coalesce around the catalytic center.\",\n      \"method\": \"Molecular dynamics simulation (validated against NMR data from prior structural work)\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 computational + prior experimental NMR data; single computational study\",\n      \"pmids\": [\"27576863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SENP1 modulates sumoylation of RB and Lamin A/C; SUMO1 conjugation of both RB and Lamin A/C is required for their interaction; SENP1 deSUMOylation disrupts this complex; SUMO1-dependent RB-Lamin A/C complex protects both proteins from proteasomal degradation.\",\n      \"method\": \"Co-immunoprecipitation, proteasome inhibitor experiments, SUMO-site mutagenesis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP and mutagenesis showing SUMOylation-dependent interaction; single lab\",\n      \"pmids\": [\"27270425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SENP1 deSUMOylates NEMO (via SENP1 de-SUMOylation of NEMO at K277/309) to regulate PTP1B SUMOylation status. In SENP1-deficient macrophages, SUMOylated PTP1B has reduced ability to de-phosphorylate STAT3, causing elevated STAT3 activity which suppresses STAT1 via SOCS3 induction, impairing IFN-γ/STAT1 signaling and M1 macrophage activation.\",\n      \"method\": \"SENP1-KO macrophages, co-immunoprecipitation, phospho-western, infection assay\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO cells with mechanistic biochemistry; single lab\",\n      \"pmids\": [\"27702761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SENP1 localizes to the nuclear pore complex (NPC) via interaction with Nup153; tethering SENP1 to NPCs in Nup153-depleted cells restores SENP1-dependent SUMO1 modification of 53BP1, which is a prerequisite for efficient 53BP1 accumulation at DNA double-strand breaks and NHEJ repair.\",\n      \"method\": \"Artificial tethering of SENP1 to NPC, RNAi depletion, DSB repair assay, 53BP1 SUMO modification assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — artificial tethering rescue experiment with functional DSB repair readout\",\n      \"pmids\": [\"28576968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SENP1 participates in Elk-1 deSUMOylation; among SENPs, Elk-1 preferentially forms a complex with SENP1 (co-IP); SENP1 is the most efficient at promoting Elk-1 transactivation; SENP1 depletion reduces c-FOS target gene activation; SENP1 and SENP2 show partial redundancy in Elk-1 deSUMOylation.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown, combinatorial knockdown, reporter assay, ChIP\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP + RNAi epistasis; single lab\",\n      \"pmids\": [\"20337593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SENP1 interacts with and deSUMOylates c-Myc in cells and in vitro; wild-type but not catalytically inactive C603S SENP1 stabilizes c-Myc. SENP1-mediated deSUMOylation reduces c-Myc polyubiquitination and promotes monoubiquitinated c-Myc and its phosphorylation at S62/T58, indicating SUMOylation promotes c-Myc proteasomal degradation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro deSUMOylation assay, catalytic mutant, ubiquitination assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro deSUMOylation, catalytic mutant, ubiquitination cross-talk analysis\",\n      \"pmids\": [\"30305424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SENP1 deSUMOylates KLF15 under hypoxia, causing its translocation from nucleus to cytoplasm; nuclear KLF15 directly suppresses Arg2 (arginase 2) transcription in pulmonary endothelial cells; hypoxia-triggered KLF15 deSUMOylation by SENP1 releases Arg2 expression and impairs NO production.\",\n      \"method\": \"ChIP for KLF15 on Arg2 promoter, immunofluorescence for KLF15 localization, SENP1 overexpression, arginase activity assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus localization experiment with functional vascular readout; single lab\",\n      \"pmids\": [\"29472234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Streptonigrin binds SENP1 at the SUMO-binding surface (exosite), disrupting SENP1-SUMO1 interaction; NMR chemical shift perturbation identified key aromatic π-stacking residues involved in binding; cell treatment increases global SUMOylation and reduces HIF-1α levels.\",\n      \"method\": \"NMR chemical shift perturbation, site-directed mutagenesis, cell-based SUMOylation assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR binding site identification with mutagenesis confirmation\",\n      \"pmids\": [\"29481054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sirt3 is SUMOylated in mitochondria; SUMOylation suppresses Sirt3 deacetylase activity. During fasting, SENP1 translocates into mitochondria and deSUMOylates Sirt3, activating its deacetylase activity, leading to decreased mitochondrial protein acetylation and increased fatty acid oxidation. SENP1 deficiency causes hyper-SUMOylation of Sirt3, hyper-acetylation of mitochondrial proteins, and impaired metabolic adaptation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro deSUMOylation assay, subcellular fractionation, SENP1-KO mice, Sirt3 KR mutation, metabolic phenotyping\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro assay, KO mice, SUMOylation-deficient mutant, mitochondrial fractionation; multiple orthogonal methods\",\n      \"pmids\": [\"31302001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SENP1 deSUMOylates USP28; under hypoxia, HIF-1α activates SENP1 which then deSUMOylates USP28, increasing USP28 deubiquitinase activity toward HIF-1α, amplifying HIF-1α accumulation in a positive feedback loop.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, in vitro deSUMOylation assay, luciferase reporter\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical assays with functional reporter; single lab\",\n      \"pmids\": [\"30622440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SENP1 deSUMOylates IDOL (an E3 ubiquitin ligase for LDLR) at K293; SUMOylation of IDOL counteracts its auto-ubiquitination and increases IDOL stability. SENP1-mediated deSUMOylation reduces IDOL levels, increasing LDLR protein levels and LDL uptake; loss of SENP1 lowers LDLR in an IDOL-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis (K293), SENP1 KD, LDL uptake assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — SUMOylation site mutagenesis, IDOL-dependent epistasis, functional LDL uptake readout\",\n      \"pmids\": [\"33154164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SENP1 promotes T cell memory development through Sirt3 deSUMOylation in mitochondria. SENP1-Sirt3 axis promotes OXPHOS and mitochondrial fusion by deacetylating mitochondrial metalloprotease YME1L1, suppressing OPA1 cleavage. Fructose-1,6-bisphosphate (FBP) negatively regulates AMPK-mediated SENP1-Sirt3 activation.\",\n      \"method\": \"T cell-specific KO, co-immunoprecipitation, mitochondrial fractionation, acetylation assay, mitochondrial morphology imaging\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — T cell-specific KO, biochemical pathway dissection, multiple orthogonal methods\",\n      \"pmids\": [\"34272364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SENP1 deficiency in neurons leads to increased SUMOylation and degradation of FMRP; re-introducing SENP1 or FMRP specifically in the retrosplenial agranular (RSA) cortex rescues synaptic function defects and autistic-like symptoms in Senp1+/- mice.\",\n      \"method\": \"Conditional heterozygous mice, stereotactic rescue (viral SENP1/FMRP expression), electrophysiology, behavioral tests\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo rescue with regional specificity, electrophysiology, behavioral readouts\",\n      \"pmids\": [\"34731627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"β-cell SENP1 is required for incretin (GLP-1/GIP)-stimulated insulin exocytosis downstream of cAMP/Ca2+ signaling; β-cell-specific SENP1 KO mice develop oral glucose intolerance on HFD with impaired β-cell exocytosis to incretin receptor agonists without changes in cAMP or Ca2+ levels.\",\n      \"method\": \"β-cell-specific KO, patch-clamp exocytosis, insulin secretion assay, oral vs. IV glucose tolerance\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — β-cell-specific KO with electrophysiology, downstream of signaling dissection\",\n      \"pmids\": [\"34462260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"JAK2 is SUMOylated; SENP1 directly interacts with and deSUMOylates JAK2, causing JAK2 cytoplasmic accumulation and activation. This SENP1/JAK2 axis is activated in platinum-resistant ovarian cancer via RUNX2 transcription factor; SENP1 inhibition overcomes platinum resistance.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, deSUMOylation assay, RUNX2 ChIP, drug resistance assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, localization, functional resistance assay; single lab\",\n      \"pmids\": [\"33795649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SENP1 deSUMOylates RIPK1 within the TNF receptor signaling complex (TNF-RSC), keeping RIPK1 kinase activity in check. SENP1 deficiency promotes RIPK1 SUMOylation, re-orchestrates TNF-RSC, and alters RIPK1 ubiquitination patterns to activate RIPK1-dependent apoptosis and NASH progression.\",\n      \"method\": \"Hepatocyte-specific SENP1-KO mice, Co-immunoprecipitation of TNF-RSC, SUMOylation/ubiquitination assay, RIPK1 kinase inhibitor rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO, biochemical complex analysis, kinase-inhibitor rescue; multiple orthogonal methods\",\n      \"pmids\": [\"36414671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SENP1-Sirt3 signaling controls glutaminolysis for α-ketoglutarate (αKG) production during IL-4-stimulated M2 macrophage polarization. SENP1 deSUMOylates and activates Sirt3, which in turn deacetylates GLUD1 (glutamate dehydrogenase 1) to increase its activity, promoting αKG accumulation and Jmjd3-dependent H3K27me3 demethylation.\",\n      \"method\": \"Co-immunoprecipitation, deSUMOylation and deacetylation assays, GLUD1 activity assay, metabolomics\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — biochemical cascade reconstitution, activity assays, metabolomics; single lab but multiple methods\",\n      \"pmids\": [\"35417703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SENP1 is identified as a specific deSUMOylase for KLF4; SENP1-KLF4 axis promotes M1 macrophage polarization by affecting NF-κB signaling; SUMOylation-deficient KLF4 macrophages exert anti-tumor activity.\",\n      \"method\": \"Co-immunoprecipitation, deSUMOylation assay, NF-κB reporter, macrophage polarization assay\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP and functional polarization assay; single lab\",\n      \"pmids\": [\"35942612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SUMOylated RNF168 undergoes liquid-liquid phase separation (LLPS), restricting its recruitment to DNA damage sites. SENP1 deSUMOylates RNF168, preventing LLPS and promoting RNF168 recruitment to DNA damage sites, RNF168-catalyzed H2A ubiquitination, and 53BP1-dependent NHEJ repair.\",\n      \"method\": \"Co-immunoprecipitation, in vitro phase separation assay, deSUMOylation assay, NHEJ repair assay, H2A ubiquitination assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro phase separation, deSUMOylation assay, functional DNA repair readout\",\n      \"pmids\": [\"37350666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SENP1 deSUMOylates MAVS; poly-SUMOylation of MAVS (mediated by PIAS3) promotes MAVS K63-linked polyubiquitination, aggregation, and liquid-liquid phase separation through a SUMO-interacting motif (SIM) in MAVS. IRF3 is recruited to SUMOylated MAVS droplets via a SIM in IRF3; IRF3 phosphorylation at residues adjacent to this SIM releases activated IRF3 from MAVS condensates.\",\n      \"method\": \"Co-immunoprecipitation, in vitro phase separation assay, SIM mutagenesis, IRF3 phosphorylation analysis, antiviral reporter assay\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro reconstitution of phase separation, SIM mutagenesis, mechanistic dissection of MAVS-IRF3 interaction\",\n      \"pmids\": [\"37188808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Hydrogen sulfide (H2S) S-sulfhydrates SENP1 at C683, increasing its activity, which then deSUMOylates SERCA2a to increase its expression and activity, improving calcium homeostasis and cardiac function in diabetic cardiomyopathy. SENP1 C683A mutation blocks H2S-induced SERCA2a SUMOylation regulation.\",\n      \"method\": \"S-sulfhydration assay, co-immunoprecipitation, SENP1 C683A mutant, SERCA2a activity assay, in vivo diabetic model\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — PTM-site mutant with functional cardiac readout; single lab\",\n      \"pmids\": [\"36750014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Redox sensing by SENP1 in β-cells is mediated by a thiol at C535; together with Zn2+-binding, C535 suppresses basal protease activity. A reduced cytosolic redox state (as occurs after 2-day high-fat diet) relieves this suppression and activates SENP1-dependent insulin exocytosis. Pancreas/β-cell-specific SENP1 KO mice fail to up-regulate exocytosis and become rapidly glucose intolerant.\",\n      \"method\": \"β-cell-specific KO, C535 mutagenesis, redox manipulation, patch-clamp exocytosis, in vivo glucose tolerance\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — active-site mutagenesis identifying redox-sensing cysteine, KO mouse, electrophysiology\",\n      \"pmids\": [\"38184650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SENP1 deSUMOylates HSP90ab1 in cardiomyocytes; HSP90ab1 SUMOylation at K72 activates STAT3 and promotes fibronectin secretion, driving fibroblast activation and cardiac fibrosis after MI. SENP1 overexpression or HSP90ab1 K72 mutation ameliorates adverse ventricular remodeling.\",\n      \"method\": \"Cardiomyocyte-specific KO and overexpression mice, co-immunoprecipitation, K72 mutation, MI model, cardiac fibrosis assay\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO/OE with mechanistic biochemistry; single lab\",\n      \"pmids\": [\"38992961\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SENP1 is a nuclear/mitochondrial cysteine-family SUMO-specific isopeptidase that processes SUMO precursors and deconjugates SUMO-1/-2/-3 from a broad range of substrates—including HIF-1α, GATA1, Sirt3, c-Myc, RIPK1, MAVS, RNF168, JAK2, HDAC1, AR, Pin1, NEMO, and many others—thereby controlling transcription, metabolism, DNA repair, apoptosis, immune signaling, and mitochondrial function; its catalytic activity requires C603 (human), is allosterically activated by the β-grasp domain of SUMO binding at an exosite ~20 Å from the active site, is redox-regulated through C535 in β-cells, and can be post-translationally regulated by S-sulfhydration, with subcellular localization governed by an N-terminal NLS, a C-terminal NES, and interactions with nuclear pore complex components such as Nup153.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SENP1 is a SUMO-specific cysteine protease that processes SUMO-1/-2/-3 precursors and deconjugates SUMO from a broad array of substrates, thereby controlling transcription, erythropoiesis, metabolism, DNA repair, immune signaling, and mitochondrial function. Its catalytic activity depends on C603 and is allosterically activated by the β-grasp domain of SUMO binding an exosite ~20 Å from the active site, with additional regulation by redox sensing at C535 in β-cells and S-sulfhydration at C683 [PMID:16712526, PMID:25263960, PMID:38184650, PMID:36750014]. SENP1 shuttles between nucleus and cytoplasm via an N-terminal NLS and a C-terminal NES, localizes to kinetochores during mitosis, associates with the nuclear pore complex through Nup153, and translocates into mitochondria during fasting to activate Sirt3-dependent fatty acid oxidation and T cell memory formation [PMID:14563852, PMID:16253240, PMID:24048451, PMID:22688647, PMID:31302001, PMID:34272364]. Mouse knockouts demonstrate that SENP1 is essential for embryonic development, definitive erythropoiesis through GATA1 deSUMOylation, incretin-stimulated insulin exocytosis in β-cells, and hepatocyte survival by restraining RIPK1-dependent apoptosis [PMID:15923632, PMID:20457756, PMID:26389676, PMID:34462260, PMID:36414671].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing SENP1 as a catalytically active SUMO protease with regulated nuclear localization answered the basic question of how this protease is organized: it requires C603 for activity, contains an N-terminal NLS for nuclear targeting, and its N-terminus auto-inhibits the catalytic domain.\",\n      \"evidence\": \"NLS mutagenesis, catalytic-dead C→A mutant expression, immunofluorescence in mammalian cells\",\n      \"pmids\": [\"14563852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of N-terminal autoinhibition not defined\", \"Relative contributions of NLS vs. NES to steady-state localization not dissected\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating that SENP1 coactivates androgen receptor transcription indirectly—by deSUMOylating HDAC1 rather than AR itself—established the principle that SENP1 controls transcription through chromatin-modifying intermediates.\",\n      \"evidence\": \"Co-IP, transcriptional reporter assays, HDAC1 RNAi epistasis\",\n      \"pmids\": [\"15199155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SENP1 can also directly deSUMOylate AR was unresolved at this stage\", \"Identity of other HDAC family members regulated by SENP1 unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Biochemical reconstitution and mouse knockout together established that SENP1 processes all three SUMO paralog precursors with preference for SUMO-1, and that its loss causes embryonic lethality due to global SUMO hyperconjugation.\",\n      \"evidence\": \"In vitro protease assays with purified proteins and SUMO precursor mutagenesis; retroviral insertional KO mouse with placental defects\",\n      \"pmids\": [\"15487983\", \"15923632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific substrates responsible for placental lethality not identified\", \"Redundancy with other SENPs in vivo not quantified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The 2.8 Å crystal structure of SENP1 C603S–SUMO-1 revealed the active-site architecture, a required conformational change preceding cleavage, and four interface residues determining SUMO paralog specificity, providing the first structural framework for SENP1 catalysis.\",\n      \"evidence\": \"X-ray crystallography, in vitro maturation/deconjugation assays, active-site mutagenesis\",\n      \"pmids\": [\"16712526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length structure including N-terminal regulatory domain unavailable\", \"Structural basis for isopeptidase vs. endopeptidase preference not resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery that TNF-induced ROS releases SENP1 from a cytoplasmic thioredoxin complex, triggering its nuclear translocation and HIPK1 deSUMOylation leading to ASK1-JNK-mediated apoptosis, established redox-regulated SENP1 shuttling as a signaling mechanism.\",\n      \"evidence\": \"In vitro deSUMOylation, reciprocal Co-IP for SENP1–thioredoxin, SENP1-KO MEFs, nuclear fractionation\",\n      \"pmids\": [\"18219322\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular detail of SENP1–thioredoxin interaction not structurally characterized\", \"Whether other oxidative stimuli use the same release mechanism unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"SENP1 knockout mice die of anemia due to impaired fetal liver erythropoiesis: SENP1 deSUMOylates GATA1 to restore its DNA-binding capacity at erythroid promoters, identifying the first essential developmental substrate axis for SENP1.\",\n      \"evidence\": \"Cre-loxP KO mice, bone marrow transplant, in vitro deSUMOylation, ChIP, flow cytometry\",\n      \"pmids\": [\"20457756\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GATA1 is the sole critical erythroid substrate not excluded\", \"Post-natal erythropoietic role of SENP1 not addressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of a HIF-1α→SENP1→HIF-1α positive feedback loop—where HIF-1α transcriptionally induces SENP1, and SENP1 deSUMOylates and stabilizes HIF-1α—explained how hypoxic signaling is amplified in angiogenesis and later in cancer.\",\n      \"evidence\": \"ChIP for HIF-1α on SENP1 HRE, promoter mutagenesis, siRNA, SENP1-null embryo analysis; transgenic prostate model with IHC\",\n      \"pmids\": [\"20841360\", \"20551310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the loop is terminated or counter-regulated is unknown\", \"Whether SENP1 deSUMOylates HIF-2α with equal efficiency not tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"SENP1 localizes to kinetochores during mitosis and its depletion delays sister chromatid separation, revealing a cell-cycle-specific function beyond interphase transcription regulation.\",\n      \"evidence\": \"RNAi, live-cell imaging, immunofluorescence, chromosome segregation assay\",\n      \"pmids\": [\"24048451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetochore substrates of SENP1 not identified\", \"Mechanism of SENP1 kinetochore recruitment unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"NMR relaxation experiments revealed that the β-grasp domain of SUMO allosterically activates SENP1 by binding an exosite ~20 Å from the catalytic center, quenching nanosecond dynamics and restructuring the lid residue Trp465—providing a biophysical mechanism for substrate-assisted catalysis.\",\n      \"evidence\": \"NMR relaxation and chemical shift perturbation, enzyme kinetics; subsequent MD simulations describing 'dock-and-coalesce' mechanism\",\n      \"pmids\": [\"25263960\", \"27576863\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether allosteric activation differs for SUMO-2/3 vs. SUMO-1 not tested by NMR\", \"Full kinetic model including N-terminal domain absent\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Tissue-specific knockouts revealed that SENP1 controls insulin exocytosis in β-cells (via NADPH/GSH-dependent activation) and restrains NF-κB in adipocytes (by deSUMOylating NEMO at K277/K309), linking SENP1 to metabolic disease and diabetes.\",\n      \"evidence\": \"Islet-specific and adipocyte-specific KO mice, patch-clamp exocytosis, NF-κB reporter, metabolite supplementation, human T2D islets\",\n      \"pmids\": [\"26389676\", \"26596471\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of β-cell exocytotic SUMO substrates not determined at this stage\", \"Whether adipocyte NEMO is the sole relevant substrate for inflammatory phenotype unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstration that SENP1 is tethered to the nuclear pore complex via Nup153 and that this localization is required for SUMO1-dependent 53BP1 recruitment to DNA double-strand breaks connected SENP1 to the DNA damage response pathway.\",\n      \"evidence\": \"Artificial tethering rescue of SENP1 at NPC in Nup153-depleted cells, DSB repair assay, 53BP1 SUMO modification assay\",\n      \"pmids\": [\"28576968\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SENP1 directly deSUMOylates 53BP1 or acts on an intermediate is unclear\", \"Role of SENP1 in HR vs. NHEJ pathway choice not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showing that SENP1 deSUMOylates c-Myc to switch its ubiquitination pattern from poly- to mono-ubiquitination and stabilize the oncoprotein established SUMO-ubiquitin cross-talk as a key SENP1-regulated mechanism in oncogenesis.\",\n      \"evidence\": \"Co-IP, in vitro deSUMOylation, C603S catalytic mutant, ubiquitination assay\",\n      \"pmids\": [\"30305424\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which E3 ligase generates the SUMO-dependent polyubiquitin chain on c-Myc not identified\", \"In vivo tumor model validation lacking\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Discovery that SENP1 translocates into mitochondria during fasting to deSUMOylate Sirt3 and activate fatty acid oxidation expanded SENP1's functional compartment beyond the nucleus and identified a SENP1–Sirt3 metabolic axis.\",\n      \"evidence\": \"Mitochondrial fractionation, in vitro deSUMOylation, Sirt3 KR mutant, SENP1-KO mice, metabolic phenotyping\",\n      \"pmids\": [\"31302001\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mitochondrial import mechanism for SENP1 not characterized\", \"Whether mitochondrial SENP1 has substrates beyond Sirt3 unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The SENP1–Sirt3 axis was extended to T cell immunology: SENP1 promotes T memory cell development by activating Sirt3-dependent OXPHOS and mitochondrial fusion through YME1L1 deacetylation, integrating metabolic and immune functions.\",\n      \"evidence\": \"T cell-specific KO, mitochondrial fractionation, acetylation assay, mitochondrial morphology imaging\",\n      \"pmids\": [\"34272364\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other immune cell lineages require SENP1–Sirt3 axis not tested\", \"Upstream signals triggering mitochondrial SENP1 translocation in T cells not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Hepatocyte-specific SENP1 deletion showed that SENP1 restrains RIPK1-dependent apoptosis by deSUMOylating RIPK1 within the TNF receptor signaling complex, preventing NASH progression—the first link of SENP1 to death receptor complex regulation.\",\n      \"evidence\": \"Hepatocyte-specific KO, Co-IP of TNF-RSC, SUMOylation/ubiquitination assay, RIPK1 kinase inhibitor rescue\",\n      \"pmids\": [\"36414671\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMOylation sites on RIPK1 not mapped\", \"Whether SENP1 also regulates necroptosis through RIPK1/RIPK3/MLKL not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Two studies revealed that SENP1 counteracts SUMO-driven liquid-liquid phase separation: it prevents SUMOylated RNF168 from forming condensates that sequester it away from DNA damage sites, and it opposes PIAS3-mediated poly-SUMOylation of MAVS that drives MAVS aggregation for IRF3 recruitment during antiviral signaling.\",\n      \"evidence\": \"In vitro phase separation reconstitution for both RNF168 and MAVS, SIM mutagenesis, NHEJ repair and antiviral reporter assays\",\n      \"pmids\": [\"37350666\", \"37188808\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SENP1 regulation of phase separation extends to other substrates is unknown\", \"Kinetics of SENP1-mediated condensate dissolution not measured\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of C535 as a redox-sensing thiol in SENP1 that, together with Zn²⁺ binding, suppresses basal protease activity in β-cells provided the first molecular mechanism for how metabolic redox changes directly activate SENP1-dependent insulin exocytosis.\",\n      \"evidence\": \"C535 mutagenesis, redox manipulation, β-cell-specific KO, patch-clamp exocytosis, in vivo glucose tolerance\",\n      \"pmids\": [\"38184650\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether C535 redox regulation operates in non-β-cell contexts unknown\", \"Structural basis of Zn²⁺-mediated inhibition at C535 not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the mechanism of SENP1 mitochondrial import, whether allosteric activation differs among SUMO paralogs, the full-length structure including the N-terminal regulatory domain, and how SENP1 activity is terminated to prevent excessive deSUMOylation.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length SENP1 structure unavailable\", \"Mitochondrial targeting signal/import pathway not identified\", \"Counter-regulatory mechanisms limiting SENP1 activity undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 5, 7, 9, 15, 30, 33, 40, 43, 44]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 2, 5, 46]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 4, 6, 16]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [33, 36]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [14, 17, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 2, 5, 9, 15, 30, 33, 40, 43, 44]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 7, 8, 10, 29, 31]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [28, 43]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [22, 27, 36, 42, 44]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 9, 24]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [6, 40]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 12, 23, 34, 39, 44]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [33, 35, 41]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [33, 36]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SUMO1\",\n      \"Nup153\",\n      \"GATA1\",\n      \"SIRT3\",\n      \"HDAC1\",\n      \"HIF1A\",\n      \"RIPK1\",\n      \"RNF168\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}