{"gene":"PIAS3","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":1997,"finding":"PIAS3 binds directly to activated STAT3 (but not STAT1), blocks its DNA-binding activity, and inhibits STAT3-mediated gene activation; the interaction occurs only in cells stimulated with ligands that activate STAT3.","method":"Co-immunoprecipitation (in vivo), DNA-binding assay, transcriptional reporter assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, DNA-binding assay, and reporter assay in a foundational paper; widely replicated across many subsequent independent labs","pmids":["9388184"],"is_preprint":false},{"year":2000,"finding":"The zinc finger protein Gfi-1 physically interacts with PIAS3 (yeast two-hybrid and co-precipitation from eukaryotic cells), co-localizes with PIAS3 in nuclear dot structures, and overcomes PIAS3-mediated inhibition of STAT3 transcriptional activity, enhancing IL-6-dependent T-cell activation.","method":"Yeast two-hybrid, co-immunoprecipitation, co-localization (nuclear dots), luciferase reporter assay, primary T-cell activation assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus yeast two-hybrid plus functional reporter, multiple orthogonal methods in one study","pmids":["11060035"],"is_preprint":false},{"year":2001,"finding":"PIAS3 directly associates with MITF (microphthalmia transcription factor) via an in vitro pull-down and co-immunoprecipitation from mast cells and melanocytes, blocking MITF DNA-binding activity and inhibiting MITF-mediated transcriptional activation up to 94%.","method":"In vitro pull-down, co-immunoprecipitation, gel-shift (EMSA), luciferase reporter assay (co-transfection)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (pulldown, Co-IP, EMSA, reporter) in one study","pmids":["11709556"],"is_preprint":false},{"year":2001,"finding":"Estrogen-activated ER induces PIAS3 mRNA expression and increases physical association of PIAS3 with STAT3, blocking STAT3 DNA binding and transactivation in multiple myeloma cells without directly associating with STAT3, identifying PIAS3 as a co-regulator mediating ER-STAT3 cross-talk.","method":"Co-immunoprecipitation, EMSA, reporter assay, RT-PCR","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP and functional assays in a single lab study","pmids":["11429412"],"is_preprint":false},{"year":2001,"finding":"HMGI-C (a Ras/ERK-inducible protein) interacts with PIAS3 (identified by yeast two-hybrid and co-immunoprecipitation); the HMGI-C·PIAS3 complex cooperatively represses both glucocorticoid receptor/dexamethasone-stimulated α-ENaC transcription and STAT3-mediated transactivation.","method":"Yeast two-hybrid, co-immunoprecipitation, transcriptional reporter assay, Northern blot","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by Co-IP and functional reporter, single lab","pmids":["11390395"],"is_preprint":false},{"year":2002,"finding":"PIAS3 was isolated as an IRF-1-binding protein (yeast two-hybrid), also binds SUMO-1 and the E2 enzyme Ubc9, and SUMOylates IRF-1 in a RING-finger domain-dependent manner, thereby repressing IRF-1 transcriptional activity.","method":"Yeast two-hybrid, co-expression SUMOylation assay (RING mutant), transcriptional reporter assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1-2 / Weak — RING domain mutagenesis + SUMOylation assay + reporter, but single lab single study","pmids":["12387893"],"is_preprint":false},{"year":2002,"finding":"PIAS3 interacts in vivo and in vitro with the nuclear receptor coactivator TIF2 through a conserved acidic domain of PIAS3; PIAS3 positively or negatively modulates TIF2-mediated ligand-enhanced transcriptional activation depending on the steroid receptor context.","method":"Co-immunoprecipitation (in vivo and in vitro), transcriptional reporter assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP (in vivo + in vitro) with functional reporter, single lab","pmids":["12208521"],"is_preprint":false},{"year":2003,"finding":"PIAS3 interacts with Smad proteins (most strongly Smad3) at the endogenous level in mammalian cells and in vitro through the C-terminal domain of Smad3; PIAS3 also interacts with p300/CBP via its RING domain, and PIAS3, Smad3 and p300 form a ternary complex that activates TGF-β/Smad transcriptional responses. A RING-domain mutant unable to bind p300/CBP loses this activation.","method":"Co-immunoprecipitation (endogenous and exogenous), in vitro binding, mutagenesis (RING domain mutant), transcriptional reporter assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — endogenous Co-IP + in vitro binding + mutagenesis + functional reporter, multiple orthogonal methods in one study","pmids":["14691252"],"is_preprint":false},{"year":2003,"finding":"The Zip (leucine zipper) domain of MITF mediates direct interaction with PIAS3; phosphorylation of MITF at Ser409 significantly reduces the PIAS3–MITF interaction and diminishes PIAS3's inhibitory effect on MITF transcriptional activity.","method":"In vitro pull-down, co-immunoprecipitation, site-directed mutagenesis (phospho-site mutants), luciferase reporter assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis + pulldown + Co-IP + reporter, single lab","pmids":["14645519"],"is_preprint":false},{"year":2004,"finding":"PIAS3 associates with the p65/RelA subunit of NF-κB (via an LXXLL motif in the N-terminal region of PIAS3) in vitro (pull-down) and in vivo (Co-IP), inhibits NF-κB-dependent transcription induced by TNF-α, IL-1β, RANK, TNFR1, CD30, and TRAFs, and interferes with p65 binding to the CBP coactivator. Knockdown of PIAS3 by RNAi reverses this inhibition.","method":"Yeast two-hybrid, in vitro pull-down, co-immunoprecipitation, luciferase reporter assay, RNAi knockdown, N-terminal domain mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP + pulldown + reporter + RNAi rescue, multiple orthogonal methods","pmids":["15140884"],"is_preprint":false},{"year":2004,"finding":"ATBF1 interacts with PIAS3 (yeast two-hybrid, co-immunoprecipitation) and synergistically enhances PIAS3-mediated inhibition of IL-6-activated STAT3, though ATBF1 alone has no effect on STAT3 signaling.","method":"Yeast two-hybrid, co-immunoprecipitation, luciferase reporter assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — yeast two-hybrid + Co-IP + reporter, single lab","pmids":["14715251"],"is_preprint":false},{"year":2004,"finding":"PIAS3 functions as a SUMO-E3 ligase (previously established) and was found to regulate protein stability and function by promoting sumoylation of nuclear proteins; overexpression of PIAS3 induces apoptosis in prostate cancer cell lines in vitro and in vivo.","method":"Cell viability/apoptosis assay (in vitro and in vivo xenograft), immunohistochemistry","journal":"Oncology reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — functional phenotype (apoptosis) reported but mechanism not directly tested in this paper; references previously established SUMO ligase activity","pmids":["15138572"],"is_preprint":false},{"year":2004,"finding":"In cytokine-stimulated cells (gp130, c-Kit receptor activation), phosphorylation of MITF at Ser409 triggers dissociation of PIAS3 from MITF and its re-association with STAT3, demonstrating ligand-dependent switching of PIAS3 between the two transcription factors.","method":"Co-immunoprecipitation, phosphorylation analysis, reporter assay in melanoma/mast cells and MITF(di/di) mouse-derived mast cells","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP under stimulation conditions + genetic model (MITF-di/di lacking Zip domain), two orthogonal approaches","pmids":["15572665"],"is_preprint":false},{"year":2005,"finding":"A 50-amino-acid motif (PIAS82-132) containing two α-helices is sufficient for PIAS3 to inhibit both MITF and STAT3; disruption of one helix abolishes PIAS3 inhibitory activity toward both transcription factors, defining a common binding interface.","method":"Domain mapping, 3D protein modeling, mutagenesis (helix disruption), reporter assay","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 1-2 / Weak — mutagenesis + structural modeling + functional reporter, single lab","pmids":["16368885"],"is_preprint":false},{"year":2006,"finding":"PIAS3 induces SUMOylation of progesterone receptor B (PRB) at Lys-7, Lys-388, and Lys-531; this SUMOylation inhibits PRB DNA-binding, promotes nuclear export, and represses PRB transactivation of progesterone-responsive genes. The interaction between PIAS3 and PRB is enhanced by progesterone, and PIAS3 is recruited to progesterone-responsive promoters in a hormone-dependent manner.","method":"Co-immunoprecipitation (in vitro and in vivo), siRNA knockdown, SUMOylation assay with mutagenesis (Lys→Arg), nuclear export assay, chromatin immunoprecipitation (ChIP), reporter assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro and in vivo SUMOylation assay with site-specific mutagenesis, ChIP, Co-IP, multiple orthogonal methods in one study","pmids":["17020914"],"is_preprint":false},{"year":2007,"finding":"PIAS3 interacts with ATF1 (yeast two-hybrid, co-immunoprecipitation) and blocks ATF1 DNA binding to the antioxidant-responsive element (ARE) of the ferritin H gene, reversing ATF1-mediated repression. PIAS3 knockdown decreases basal and oxidative-stress-induced ferritin H expression.","method":"Yeast two-hybrid, co-immunoprecipitation, EMSA, siRNA knockdown, reporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid + Co-IP + EMSA + siRNA knockdown, multiple orthogonal methods","pmids":["17565989"],"is_preprint":false},{"year":2007,"finding":"Nitric oxide (NO) causes S-nitrosation of PIAS3 at Cys459, which promotes interaction with the ubiquitin E3 ligase TRIM32, leading to PIAS3 ubiquitination and degradation (global hyposumoylation). Mutation of Cys459 abolishes NO-stimulated PIAS3–TRIM32 interaction.","method":"S-nitrosation assay, co-immunoprecipitation, site-directed mutagenesis (Cys459), ubiquitination assay, SUMO conjugation assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — site-directed mutagenesis identifying the S-nitrosation site + Co-IP + ubiquitination assay, multiple orthogonal methods","pmids":["17987106"],"is_preprint":false},{"year":2008,"finding":"TRIM8 interacts with PIAS3, causes its proteasomal degradation or nuclear exclusion, cancels the negative effect of PIAS3 on STAT3, and thereby enhances Src-dependent tumorigenesis.","method":"Co-immunoprecipitation, ectopic expression, proteasome inhibitor assay, focus formation assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP + proteasome assay + nuclear fractionation + functional tumorigenesis assay, single lab","pmids":["20516148"],"is_preprint":false},{"year":2008,"finding":"PIAS3 overexpression in osteoclast-lineage transgenic mice impairs osteoclast differentiation (osteopetrotic phenotype); mechanistically, PIAS3 suppresses RANKL-induced expression of c-Fos and NFATc1 and inhibits MITF transcriptional activity independently of sumoylation. PIAS3 overexpression in osteoblasts also downregulates IL-6-induced RANKL expression, indirectly reducing osteoclastogenesis.","method":"Transgenic mouse model (TRAP-promoter-driven PIAS3), RANKL-induced osteoclastogenesis assay, siRNA knockdown, reporter assay, co-culture system","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic model + in vitro knockdown/overexpression + reporter, multiple orthogonal methods","pmids":["18952894"],"is_preprint":false},{"year":2009,"finding":"PIAS3 physically interacts with M2-PK (pyruvate kinase M2) and its isoenzyme M1-PK; endogenous SUMO-1–M2-PK conjugates exist in mammalian cells; PIAS3 expression (but not a RING-domain mutant C299S/H301A) is associated with nuclear localization of M2-PK, suggesting PIAS3 SUMOylates M2-PK to promote its nuclear targeting.","method":"Co-immunoprecipitation, SUMO conjugation assay, RING domain mutagenesis, subcellular fractionation/co-localization","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP + RING mutant + localization, single lab, no direct SUMOylation site mapping","pmids":["19308990"],"is_preprint":false},{"year":2009,"finding":"In EGF-stimulated lung cancer cells, PIAS3 forms a complex with STAT3 dependent on STAT3 Tyr705 phosphorylation; within 5 minutes of EGF treatment the PIAS3–STAT3 complex translocates to the nucleus, then PIAS3 returns to the cytoplasm by 30 minutes. Mutation of Tyr705 to Phe reduces PIAS3–STAT3 binding, nuclear translocation of PIAS3, and PIAS3-mediated reduction of STAT3 transcription.","method":"Confocal microscopy, co-immunoprecipitation, site-directed mutagenesis (Y705F STAT3), luciferase reporter assay, cellular fractionation","journal":"Molecular cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — mutagenesis + Co-IP + confocal localization + reporter, multiple orthogonal methods in one study","pmids":["19903771"],"is_preprint":false},{"year":2009,"finding":"Pias3 (mouse) is selectively expressed in developing photoreceptors, binds the transcription factors Crx and Nr2e3, is targeted to photoreceptor-specific gene promoters, and SUMOylates Nr2e3, converting it into a potent repressor of cone-specific gene expression. Blocking SUMOylation in photoreceptors produces cells with cone morphological and molecular features and absent rod-specific markers.","method":"Co-immunoprecipitation (Pias3 with Crx/Nr2e3), ChIP, in vitro SUMOylation assay, pharmacological SUMOylation blockade, immunofluorescence, gene expression analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro SUMOylation + ChIP + Co-IP + loss-of-function with defined molecular phenotype, multiple orthogonal methods","pmids":["19186166"],"is_preprint":false},{"year":2010,"finding":"Pias3-dependent SUMOylation in cone photoreceptors activates M-opsin expression and represses S-opsin expression; the transcription factors Trbeta2 and Rxrgamma mediate preferential Pias3 expression in M cones, and Pias3 directly regulates M and S opsin expression by modulating cone-enriched transcription factors Rxrgamma, Roralpha, and Trbeta1.","method":"Conditional knockout/knockdown, reporter assay, ChIP, co-immunoprecipitation, in situ hybridization, electroretinography","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — loss-of-function + ChIP + Co-IP + functional ERG readout, multiple methods","pmids":["20729845"],"is_preprint":false},{"year":2010,"finding":"PIAS3 overexpression promotes sumoylation of vimentin at residue 354 (vimentin354) in GBM cells; this sumoylation is associated with inhibition of GBM cell migration and changes in cell shape.","method":"Co-immunoprecipitation with SUMO1 antibody, mass spectrometry (proteomic identification), migration assay","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — proteomics identification + IP + functional migration assay, single lab","pmids":["21317457"],"is_preprint":false},{"year":2010,"finding":"PIAS3 overexpression suppresses Akt phosphorylation and renders lung cancer cells sensitive to chemotherapeutic agents; PIAS3 siRNA knockdown accelerates cell proliferation, worsens chemosensitivity, and augments Akt phosphorylation, placing PIAS3 as a regulator of both JAK/STAT and PI3K/Akt signaling.","method":"siRNA knockdown, overexpression, Western blot (phospho-Akt), cell growth/viability assay","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — siRNA + overexpression + biochemical readout, single lab, no direct mechanism linking PIAS3 to Akt","pmids":["17032498"],"is_preprint":false},{"year":2011,"finding":"PIAS3 interacts with the STAT3 coiled-coil domain via a short fragment of PIAS3's C-terminal acidic region; a recombinant peptide derived from this region (rPP-C8) suppresses STAT3 target gene expression, inhibits migration and proliferation, and induces apoptosis in cancer cells at low concentrations.","method":"Domain mapping (deletion analysis), recombinant peptide internalization assay, STAT3 reporter assay, apoptosis/proliferation assays","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping + functional recombinant peptide with defined EC50, single lab, multiple functional readouts","pmids":["20371673"],"is_preprint":false},{"year":2011,"finding":"The PINIT domain of PIAS3 (residues 85–272) is a folded monomeric domain that directly binds STAT3 in a concentration-dependent manner; L97A, R99N, and R99Q mutations abrogate STAT3 binding, identifying these residues as part of the PIAS3–STAT3 binding interface.","method":"Recombinant protein purification, surface plasmon resonance (SPR), site-directed mutagenesis, homology modeling","journal":"Journal of molecular recognition","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — SPR binding + mutagenesis + structural modeling, single lab study","pmids":["21812053"],"is_preprint":false},{"year":2012,"finding":"PIAS3 functions as a SUMO E3 ligase for the RelA subunit of NF-κB; PIAS3-mediated SUMOylation of endogenous RelA is induced by NF-κB activation (TNFα), forming a negative regulatory feedback loop. RelA mutants resistant to SUMOylation or PIAS3 SUMO-ligase-dead mutants lose this repression. RelA DNA binding is required as a signal for PIAS3-mediated SUMOylation.","method":"In vivo SUMOylation assay, site-directed mutagenesis (SUMOylation-site mutant RelA; SUMO-ligase-dead PIAS3), co-immunoprecipitation, reporter assay, IκBα null fibroblasts","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — SUMOylation assay with mutagenesis + genetic model + Co-IP + reporter, multiple orthogonal methods","pmids":["22649547"],"is_preprint":false},{"year":2012,"finding":"PIAS3 interacts with the ErbB4 intracellular domain (ICD), promotes its SUMO modification, and drives nuclear sequestration of ErbB4 ICD into PML nuclear bodies. PIAS3 overexpression represses ErbB4 ICD coactivation of transcription with YAP; PIAS3 knockdown partially rescues ErbB4-ICD-mediated inhibition of mammary cell differentiation.","method":"Co-immunoprecipitation, SUMOylation assay, fluorescence co-localization (PML bodies), siRNA knockdown, transcriptional co-activation reporter assay, differentiation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP + SUMOylation assay + localization + siRNA rescue + functional differentiation assay, multiple orthogonal methods","pmids":["22584572"],"is_preprint":false},{"year":2013,"finding":"PIAS3 promotes homology-directed repair (HR) and non-homologous end joining (NHEJ) of DNA double-strand breaks; PIAS3 overexpression increases resistance of HeLa cells to ionizing radiation.","method":"DSB repair reporter assay (HR and NHEJ), colony survival after ionizing radiation","journal":"Oncology letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — reporter assay and clonogenic survival, single lab, no direct molecular mechanism for DSB repair identified","pmids":["24137461"],"is_preprint":false},{"year":2014,"finding":"N-terminal truncation of Stat5a/b, which occurs post-translationally in prostate cancer cells, removes the N-domain required for binding to PIAS3; PIAS3 inhibits full-length Stat5a/b transcriptional activity in breast cancer cells but not in prostate cancer cells that express the truncated form, indicating that proteolytic removal of the N-terminal domain is a mechanism by which Stat5 evades PIAS3-mediated repression.","method":"Western blot, EMSA (DNA binding), co-immunoprecipitation, N-terminal domain mutagenesis, reporter assay","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis + Co-IP + EMSA + reporter assay, single lab","pmids":["20854925"],"is_preprint":false},{"year":2015,"finding":"PIAS3 is required for ATR checkpoint activation: it is the only PIAS family member indispensable for ATR autophosphorylation in response to UV or HU, and for maintaining basal ATR kinase activity prior to DNA damage. PIAS3 is dispensable for ATRIP SUMOylation and the ATR-ATRIP interaction, but loss of PIAS3 reduces phosphorylation of ATR substrates.","method":"siRNA knockdown of each PIAS family member, ATR autophosphorylation assay, substrate phosphorylation assay (Western blot), ATR-ATRIP co-immunoprecipitation, DNA damage induction (CPT, UV, HU)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — systematic knockdown of all PIAS members + biochemical kinase activity assays + multiple DNA damage conditions, single lab but multiple orthogonal approaches","pmids":["26565033"],"is_preprint":false},{"year":2015,"finding":"PIAS3 physically interacts with SMAD2/3 (via the SMAD MH2 domain and PIAS3 RING domain) to activate TGF-β signaling, leading to increased TXNIP expression and ferroptotic susceptibility in HCC cells. Knockdown of TXNIP degrades ferroptosis caused by PIAS3 overexpression; forced TXNIP re-expression restores ferroptosis in PIAS3-knockdown cells.","method":"Co-immunoprecipitation, RNA-seq, siRNA knockdown/overexpression, ferroptosis functional assays (lipid peroxidation, cell death)","journal":"Pharmacological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP (domain mapping) + RNA-seq + epistasis via siRNA rescue, single lab","pmids":["37689128"],"is_preprint":false},{"year":2015,"finding":"PIAS3 interacts with EKLF/KLF1 transcription factor (co-immunoprecipitation with exogenous and endogenous proteins); PIAS3 acts as a transcriptional co-repressor of EKLF for β-globin and α-hemoglobin stabilizing protein genes independently of sumoylation. The LXXLL motif of PIAS3 is required for transrepression but not for the EKLF-PIAS3 interaction. PIAS3 occupies the β-globin promoter in undifferentiated erythroid cells (ChIP). PIAS3 knockdown accelerates erythroid differentiation.","method":"Co-immunoprecipitation (exogenous and endogenous), ChIP, siRNA knockdown, mutagenesis (LXXLL motif), reporter assay, differentiation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — endogenous Co-IP + ChIP + mutagenesis + siRNA knockdown + functional differentiation, multiple orthogonal methods","pmids":["25713074"],"is_preprint":false},{"year":2015,"finding":"PIAS3 enhances HIF-1α transcriptional activity by increasing HIF-1α protein stability through a mechanism independent of PIAS3's SUMO E3 ligase activity; PIAS3 physically associates with HIF-1α, and PIAS3 knockdown destabilizes HIF-1α in a proteasome-dependent manner.","method":"Co-immunoprecipitation, PIAS3 overexpression/siRNA knockdown, proteasome inhibitor rescue (MG132), RT-PCR, reporter assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP + siRNA + MG132 rescue, single lab","pmids":["26697750"],"is_preprint":false},{"year":2015,"finding":"Adenovirus E4-ORF3 specifically sequesters PIAS3 (but not PIAS1, PIAS2, or PIAS4) into a multivalent nuclear matrix, requiring E4-ORF3 polymerization; this PIAS3 targeting is conserved across disparate adenovirus subgroups.","method":"Immunofluorescence co-localization, co-immunoprecipitation/pull-down, domain mutants of E4-ORF3 (polymerization-deficient), comparative analysis across adenovirus subgroups","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specificity shown by testing all PIAS family members + domain mutants, single lab","pmids":["26223632"],"is_preprint":false},{"year":2017,"finding":"PIAS3 directly sumoylates Smurf2, and sumoylated Smurf2 (with its E3 ubiquitin ligase activity intact) suppresses invasive growth of breast cancer cell-derived organoids. Genetic ablation of PIAS3 removes this non-invasive constraint.","method":"SUMOylation assay, E3 ubiquitin ligase activity mutant, 3D organoid invasion assay, siRNA knockdown","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SUMOylation assay + activity mutant + 3D organoid functional assay, single lab","pmids":["28423498"],"is_preprint":false},{"year":2017,"finding":"TRIM8 activates STAT3 signaling in glioblastoma stem-like cells by suppressing PIAS3 expression, most likely through E3-mediated ubiquitination and proteasomal degradation of PIAS3. TRIM8 knockdown reduces p-STAT3 and stem cell markers; STAT3 activation in turn upregulates TRIM8, forming a positive feedback loop.","method":"siRNA knockdown, overexpression, Western blot (p-STAT3, stem markers), self-renewal assay, differentiation assay, co-immunoprecipitation","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional knockdown/overexpression + biochemical readout + functional stem cell assay, single lab","pmids":["28100038"],"is_preprint":false},{"year":2018,"finding":"Nuclear Smad6 interacts directly with PIAS3 through Smad6's MH2 domain and PIAS3's RING domain; Smad6 recruits Smurf1 (via its MH2 domain and PY motif) to ubiquitinate and degrade PIAS3, reducing PIAS3-mediated STAT3 inhibition and promoting glioma growth. A transducible Smad6 MH2 protein restores PIAS3 expression and reduces gliomagenesis.","method":"Co-immunoprecipitation, domain-deletion mutagenesis, ubiquitination assay, in vivo glioma model, Smad6 MH2 transducible protein rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mutants + ubiquitination assay + in vivo rescue, multiple orthogonal methods","pmids":["29950561"],"is_preprint":false},{"year":2019,"finding":"Upon TCR stimulation, PIAS3 (together with PIASxβ) acts as a SUMO E3 ligase for PLC-γ1, promoting its sumoylation at K54, which facilitates PLC-γ1 microcluster assembly and association with SLP76 and Gads adaptors, thereby supporting T cell activation.","method":"Co-immunoprecipitation, SUMOylation assay (K54R mutant), confocal imaging (microcluster formation), reporter assay, T cell activation assay","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific SUMOylation mutagenesis + Co-IP + imaging + functional T cell assay, single lab","pmids":["30873169"],"is_preprint":false},{"year":2021,"finding":"PIAS3 sumoylates Akt1 at K64 and K276 in response to NMDA receptor-mediated neuronal activity; Akt1 SUMOylation at these sites enhances its kinase activity and T308 phosphorylation. The N-terminal SAP domain of PIAS3 directly binds Akt1; disruption of the Akt1–PIAS3 interaction (using Tat-SAP peptide) inhibits LTP expression and late-phase LTP maintenance in hippocampus, and blocks ERK1/2-BDNF/Arc and mTOR-4E-BP1 cascades.","method":"In vivo/in vitro SUMOylation assay (K64R/K276R mutants), co-immunoprecipitation (SAP domain), Tat-fused peptide competition, LTP electrophysiology (hippocampal slices), kinase activity assay","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — site-specific mutagenesis + Co-IP + domain competition + in vitro kinase assay + electrophysiology LTP readout, multiple orthogonal methods","pmids":["34288124"],"is_preprint":false},{"year":2021,"finding":"BDNF signaling via TrkB facilitates nuclear exodus of PIAS3 and its enrichment in neuronal dendrites; dendritic PIAS3 modulates ERK1/2 kinase pathway signaling and inhibits GABAergic neurotransmission. PIAS3 RING and Ser/Thr domains have opposing effects on GABA-mediated inhibition. In ischemia (OGD), BDNF-TrkB signaling impairs gephyrin clustering at GABAergic synapses through SUMOylation.","method":"Live imaging (nuclear exodus), immunofluorescence, PIAS3 domain deletion constructs, GABA receptor electrophysiology, gephyrin cluster analysis, OGD model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging of PIAS3 redistribution + domain deletions + electrophysiology + gephyrin mutagenesis, single lab","pmids":["35307349"],"is_preprint":false},{"year":2024,"finding":"AMPK activation enhances PIAS3-mediated SUMOylation of Smurf1 at K324, which increases Smurf1 E3 ubiquitin ligase activity, promotes ALK2 proteolysis, and inhibits BMP signaling, thereby suppressing osteogenic differentiation and traumatic heterotopic ossification. AMPK increases the association between PIAS3 and AMPK.","method":"Co-immunoprecipitation, SUMOylation assay (K324R Smurf1 mutant), BMP signaling reporter, osteogenic differentiation assay, ALK2 ubiquitination/degradation assay, heterotopic ossification model","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific SUMOylation mutagenesis + Co-IP + functional differentiation assay, single lab","pmids":["38844181"],"is_preprint":false},{"year":2024,"finding":"PIAS3 (also known as KChAP) is a bona fide SUMO E3 ligase for the cardiac potassium channels Kv4.2 and HCN2 in HEK cells, and for endogenous Kv4.2 and Kv4.3 in cardiomyocytes. PIAS3-mediated SUMOylation at Kv4.2-K579 increases channel surface expression via a Rab11a-dependent recycling mechanism. PKA phosphorylation at Kv4.2-S552 blocks K579 SUMOylation, reducing Kv4 current, thus PKA and PIAS3 act antagonistically to control channel surface expression.","method":"In vitro and cell-based SUMOylation assay (K579R mutant), cardiomyocyte overexpression/knockdown, Rab11a dependence assay, PKA phosphorylation (S552A mutant), electrophysiology (current measurement), surface biotinylation","journal":"Cell communication and signaling","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — site-specific mutagenesis + in vitro SUMOylation + electrophysiology + surface trafficking assay, multiple orthogonal methods in one study","pmids":["39223673"],"is_preprint":false},{"year":2024,"finding":"PIAS3 sumoylates MLK3 at K401 (SUMO1 conjugation) following brain ischemia/reperfusion; this SUMOylation promotes MLK3 kinase activation and downstream p38/JNK signaling, leading to neuronal apoptosis. The PINIT domain of PIAS3 mediates direct interaction with MLK3. Overexpression of the PINIT domain (as a dominant negative) disrupts MLK3–PIAS3 interaction, inhibits MLK3 SUMOylation, suppresses downstream signaling, and reduces brain lesion and behavioral deficits in rodent ischemic models.","method":"Co-immunoprecipitation, SUMOylation assay (K401R mutant), PIAS3 domain competition (PINIT overexpression), p38/JNK phosphorylation assay, in vivo ischemia model, behavioral testing","journal":"Cellular and molecular life sciences","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — site-specific SUMOylation mutagenesis + domain competition + Co-IP + in vivo model + functional behavioral readout, multiple orthogonal methods","pmids":["38456949"],"is_preprint":false},{"year":2024,"finding":"PIAS3 acts as a zinc sensor: zinc deficiency induces ubiquitination and proteasomal degradation of PIAS3 through its RING finger domain (which contains zinc-binding sites); PIAS3 loss relieves STAT3 inhibition, activating ZIP-family zinc transporter gene expression to restore zinc homeostasis. PIAS3 with a zinc-binding site mutation (PIAS3-Mut) or RING domain deletion is resistant to zinc-deficiency-induced degradation. PIAS3-Mut overexpression worsens myocardial I/R injury.","method":"Site-directed mutagenesis (zinc-binding site mutant, RING domain deletion), ubiquitination assay, PIAS3 knockdown/overexpression, cardiac zinc measurement, mouse I/R model (infarct size), STAT3 activation assay","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — site-directed mutagenesis of RING/zinc sites + ubiquitination assay + in vivo cardiac model + multiple functional readouts, single lab but multiple orthogonal methods","pmids":["38750767"],"is_preprint":false},{"year":2025,"finding":"METTL10 methylates PIAS3 at lysine 442 (K442), which disrupts the PIAS3–MITF interaction; as a result, PIAS3-mediated SUMOylation and ubiquitination of MITF are reduced, stabilizing MITF and activating purine metabolism in gastric cancer cells.","method":"Mass spectrometry (methylation site identification), co-immunoprecipitation (PIAS3–MITF interaction after K442 methylation), SUMOylation/ubiquitination assay, MITF stability assay","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — PTM site identification by MS + Co-IP + SUMOylation assay, single lab study","pmids":["41114928"],"is_preprint":false}],"current_model":"PIAS3 is a multifunctional SUMO E3 ligase and transcriptional co-regulator that inhibits STAT3, NF-κB/RelA, MITF, IRF-1, Stat5a/b, progesterone receptor B, and EKLF by direct binding and/or SUMOylation; it activates TGF-β/Smad transcriptional responses, potentiates HIF-1α stability, SUMOylates diverse substrates (Nr2e3, vimentin, M2-PK, ErbB4 ICD, PLC-γ1, Akt1, MLK3, Kv4.2/HCN2 channels, Smurf1/2, RelA), and is itself regulated by S-nitrosation (Cys459)–driven ubiquitination via TRIM32, by TRIM8/Smad6-Smurf1 ubiquitin-mediated degradation, by zinc deficiency (RING-domain-dependent degradation), by YB1-mediated mRNA decay, and by METTL10-mediated K442 methylation that blocks its interaction with MITF; PIAS3's nucleo-cytoplasmic shuttling is ligand-dependent and tied to STAT3 Tyr705 phosphorylation, and it plays defined roles in photoreceptor specification (rod vs. cone fate), DNA damage/ATR checkpoint priming, synaptic LTP, osteoclastogenesis, and cardiac ion channel surface expression."},"narrative":{"mechanistic_narrative":"PIAS3 is a nuclear SUMO E3 ligase and transcriptional co-regulator that controls signal-dependent gene expression by directly binding transcription factors and/or conjugating SUMO to a broad range of substrates [PMID:9388184, PMID:12387893, PMID:17020914]. Its founding activity is direct binding to ligand-activated STAT3, which blocks STAT3 DNA binding and transactivation; this interaction depends on STAT3 Tyr705 phosphorylation and on a PINIT-domain interface (residues 85–272, including L97 and R99), with a short C-terminal acidic fragment additionally engaging the STAT3 coiled-coil domain [PMID:9388184, PMID:19903771, PMID:21812053, PMID:20371673]. PIAS3 represses an overlapping set of transcription factors—MITF through its leucine-zipper, plus NF-κB/RelA via an N-terminal LXXLL motif, IRF-1, ATF1, Stat5a/b, progesterone receptor B, and EKLF/KLF1—using both SUMOylation-dependent and SUMOylation-independent modes, and a single short helical motif (residues 82–132) suffices to inhibit both MITF and STAT3 [PMID:11709556, PMID:15140884, PMID:12387893, PMID:17565989, PMID:20854925, PMID:17020914, PMID:25713074, PMID:16368885]. Beyond repression, PIAS3 activates TGF-β/SMAD transcription by forming a SMAD3–p300 ternary complex through its RING domain and potentiates HIF-1α by stabilizing the protein independently of ligase activity [PMID:14691252, PMID:37689128, PMID:26697750]. As a ligase it SUMOylates Nr2e3, RelA, vimentin, ErbB4 ICD, M2-PK, PLC-γ1, Akt1, MLK3, the cardiac channel Kv4.2, and Smurf1/2, thereby governing photoreceptor rod-versus-cone fate, T-cell PLC-γ1 microcluster assembly, hippocampal LTP via Akt1, ischemic neuronal apoptosis via MLK3, and Kv4 channel surface trafficking [PMID:19186166, PMID:22649547, PMID:21317457, PMID:22584572, PMID:19308990, PMID:30873169, PMID:34288124, PMID:38456949, PMID:39223673, PMID:28423498, PMID:38844181]. PIAS3 abundance is tightly controlled: it is degraded following Cys459 S-nitrosation/TRIM32 recruitment, by TRIM8 and by Smad6-recruited Smurf1, by RING-domain-dependent degradation under zinc deficiency (acting as a zinc sensor that relieves STAT3 inhibition), and its MITF interaction is blocked by METTL10-mediated K442 methylation [PMID:17987106, PMID:20516148, PMID:29950561, PMID:38750767, PMID:41114928]. PIAS3 also functions in genome maintenance, being uniquely required among PIAS proteins for ATR checkpoint kinase activation [PMID:26565033].","teleology":[{"year":1997,"claim":"Established PIAS3's founding function: a specific endogenous inhibitor of activated STAT3, defining a post-translational brake on cytokine transcriptional signaling.","evidence":"Co-IP, DNA-binding, and reporter assays in ligand-stimulated cells","pmids":["9388184"],"confidence":"High","gaps":["Did not resolve whether inhibition requires SUMO ligase activity","Binding interface on PIAS3 not mapped"]},{"year":2001,"claim":"Extended PIAS3's repressor repertoire to MITF, showing it blocks DNA binding of a second lineage-determining transcription factor.","evidence":"In vitro pull-down, Co-IP, EMSA, and reporter assays in mast cells/melanocytes","pmids":["11709556"],"confidence":"High","gaps":["Did not establish whether MITF inhibition involves SUMOylation","Did not address how PIAS3 chooses between MITF and STAT3"]},{"year":2002,"claim":"Defined PIAS3 biochemically as a SUMO E3 ligase, linking its transcriptional repression to RING-dependent SUMO conjugation of a substrate (IRF-1).","evidence":"Yeast two-hybrid, SUMO-1/Ubc9 binding, RING-mutant SUMOylation and reporter assays","pmids":["12387893"],"confidence":"Medium","gaps":["Single lab","SUMO acceptor lysines on IRF-1 not mapped"]},{"year":2003,"claim":"Revealed PIAS3 is not solely a repressor: through its RING domain it bridges SMAD3 and p300/CBP to activate TGF-β transcription, establishing context-dependent dual function.","evidence":"Endogenous Co-IP, in vitro binding, RING-domain mutagenesis, reporter assays","pmids":["14691252"],"confidence":"High","gaps":["Did not determine whether SMAD3 is itself SUMOylated","Structural basis of ternary complex unresolved"]},{"year":2004,"claim":"Mapped the molecular logic of PIAS3 target switching and broadened it to NF-κB, showing PIAS3 inhibits RelA via an N-terminal LXXLL motif and that MITF Ser409 phosphorylation hands PIAS3 from MITF to STAT3.","evidence":"Domain mapping, pull-down, Co-IP, RNAi, reporter assays in melanoma/mast cells","pmids":["15140884","15572665"],"confidence":"High","gaps":["Stoichiometry of competing complexes not quantified","Whether RelA inhibition required SUMOylation not yet tested"]},{"year":2005,"claim":"Localized a single short helical motif (residues 82–132) sufficient to inhibit both MITF and STAT3, defining a shared inhibitory interface.","evidence":"Domain mapping, 3D modeling, helix-disruption mutagenesis, reporter assays","pmids":["16368885"],"confidence":"Medium","gaps":["No high-resolution structure","Single lab"]},{"year":2006,"claim":"Demonstrated PIAS3 represses a nuclear receptor (PRB) by site-specific SUMOylation that drives nuclear export, connecting ligase activity to hormone-dependent promoter recruitment.","evidence":"In vitro/in vivo SUMOylation with Lys mutants, ChIP, nuclear export and reporter assays","pmids":["17020914"],"confidence":"High","gaps":["SUMO isoform specificity not resolved","Generality across other nuclear receptors not tested"]},{"year":2007,"claim":"Identified the first PIAS3 degradation pathway, showing redox sensing through Cys459 S-nitrosation triggers TRIM32-mediated ubiquitination and global hyposumoylation.","evidence":"S-nitrosation assay, Cys459 mutagenesis, Co-IP, ubiquitination and SUMO-conjugation assays","pmids":["17987106"],"confidence":"High","gaps":["Physiological NO sources driving this in vivo not defined","Downstream desumoylated targets not enumerated"]},{"year":2009,"claim":"Established that the PIAS3-STAT3 complex shuttles nucleo-cytoplasmically in a STAT3 Tyr705-phosphorylation-dependent manner, linking PIAS3 trafficking to receptor activation kinetics.","evidence":"Confocal imaging, Y705F mutagenesis, Co-IP, fractionation, reporter assays in EGF-stimulated lung cancer cells","pmids":["19903771"],"confidence":"High","gaps":["Nuclear import/export machinery for PIAS3 not identified","Whether shuttling applies to non-STAT3 partners unknown"]},{"year":2009,"claim":"Defined PIAS3's role in photoreceptor cell-fate specification by SUMOylating Nr2e3 to enforce rod identity and repress cone genes.","evidence":"Co-IP with Crx/Nr2e3, ChIP, in vitro SUMOylation, pharmacological SUMO blockade with phenotype","pmids":["19186166"],"confidence":"High","gaps":["SUMO acceptor site on Nr2e3 not mapped in this study"]},{"year":2010,"claim":"Extended the retinal program to cone subtype patterning, showing Pias3-dependent SUMOylation tunes M- versus S-opsin via cone-enriched nuclear receptors.","evidence":"Conditional knockout/knockdown, ChIP, Co-IP, in situ hybridization, electroretinography","pmids":["20729845"],"confidence":"High","gaps":["Direct SUMO substrates among Rxrgamma/Roralpha/Trbeta1 not fully resolved"]},{"year":2012,"claim":"Closed the NF-κB regulatory loop by showing PIAS3 acts as a DNA-binding-dependent SUMO E3 ligase for RelA, forming a negative feedback brake on inflammatory transcription.","evidence":"In vivo SUMOylation with RelA and ligase-dead mutants, Co-IP, reporter assays in IκBα-null fibroblasts","pmids":["22649547"],"confidence":"High","gaps":["SUMO acceptor lysine on RelA not specified here","Kinetics of feedback in primary immune cells untested"]},{"year":2012,"claim":"Showed PIAS3 controls ErbB4 ICD nuclear fate by SUMO-driven sequestration into PML bodies, repressing its transcriptional coactivation and gating mammary differentiation.","evidence":"Co-IP, SUMOylation assay, PML-body co-localization, siRNA rescue, differentiation assays","pmids":["22584572"],"confidence":"High","gaps":["ErbB4 ICD SUMO site not mapped","Mechanism of PML targeting unresolved"]},{"year":2015,"claim":"Identified PIAS3 as the unique PIAS member required for ATR checkpoint kinase activation, placing it in the DNA-damage response independent of ATRIP SUMOylation.","evidence":"Systematic siRNA of all PIAS members, ATR autophosphorylation and substrate assays under UV/HU/CPT","pmids":["26565033"],"confidence":"High","gaps":["Direct SUMO substrate priming ATR not identified","Mechanism of basal ATR activity maintenance unresolved"]},{"year":2015,"claim":"Demonstrated SUMOylation-independent co-repression of EKLF/KLF1 controlling erythroid differentiation, and a SUMO-independent stabilization of HIF-1α, broadening PIAS3's non-ligase functions.","evidence":"Endogenous Co-IP, ChIP, LXXLL mutagenesis, siRNA differentiation assays; HIF-1α Co-IP and MG132 rescue","pmids":["25713074","26697750"],"confidence":"High","gaps":["How PIAS3 stabilizes HIF-1α mechanistically unresolved","Distinction between ligase-dependent and -independent target classes not systematized"]},{"year":2018,"claim":"Defined a second ubiquitin-mediated PIAS3 degradation route through Smad6-recruited Smurf1, mechanistically linking PIAS3 loss to STAT3 hyperactivation and glioma growth.","evidence":"Co-IP with domain mutants, ubiquitination assay, in vivo glioma model, Smad6 MH2 rescue","pmids":["29950561","20516148","28100038"],"confidence":"High","gaps":["Hierarchy among TRIM8/TRIM32/Smurf1 degradation routes unclear","Tissue-specific dominance of each pathway untested"]},{"year":2021,"claim":"Established neuronal SUMO-ligase functions, showing PIAS3 SUMOylates Akt1 to enhance kinase activity and support hippocampal LTP, while its TrkB-driven dendritic redistribution modulates ERK and GABAergic transmission.","evidence":"Site-specific SUMOylation mutants, SAP-domain Co-IP, Tat-peptide competition, LTP electrophysiology and live imaging","pmids":["34288124","35307349"],"confidence":"High","gaps":["Endogenous SUMO machinery dynamics in dendrites not resolved","Opposing RING vs Ser/Thr domain effects on GABA mechanistically unexplained"]},{"year":2024,"claim":"Revealed PIAS3 as a zinc sensor whose RING-domain-dependent degradation under zinc deficiency relieves STAT3 inhibition to restore zinc homeostasis, with cardiac ischemia consequences.","evidence":"Zinc-binding-site and RING-deletion mutants, ubiquitination assay, mouse I/R model, STAT3 activation","pmids":["38750767"],"confidence":"High","gaps":["Ubiquitin ligase mediating zinc-deficiency degradation not identified","Direct zinc-occupancy measurement on PIAS3 not provided"]},{"year":2024,"claim":"Extended PIAS3 SUMO targets to a cardiac ion channel and to the MLK3 stress kinase, controlling Kv4 surface trafficking and ischemic neuronal apoptosis respectively.","evidence":"Site-specific SUMOylation mutants (Kv4.2-K579, MLK3-K401), electrophysiology, surface biotinylation, in vivo ischemia and behavior","pmids":["39223673","38456949"],"confidence":"High","gaps":["Whether the same PIAS3 pool serves nuclear and membrane substrates unknown","Regulation balancing channel-promoting vs apoptosis-promoting SUMOylation untested"]},{"year":2025,"claim":"Showed METTL10-mediated K442 methylation of PIAS3 disrupts its MITF binding, stabilizing MITF and rewiring purine metabolism, adding a methylation switch to PIAS3 regulation.","evidence":"MS site identification, Co-IP after K442 methylation, SUMOylation/ubiquitination and MITF stability assays","pmids":["41114928"],"confidence":"Medium","gaps":["Single lab","Whether K442 methylation affects non-MITF substrates untested"]},{"year":null,"claim":"How PIAS3 selects between SUMO-ligase-dependent and -independent modes, and what governs partitioning of a single PIAS3 pool among its many nuclear, cytoplasmic, membrane, and synaptic substrates, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying model for ligase-dependent vs -independent target choice","No high-resolution structure of full-length PIAS3 with a substrate","Substrate-specific recruitment determinants largely unmapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[5,14,21,27,39,40,43,44]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,2,9,7,33]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,9,31,34]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[27,36,42,43]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,14,21]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[20,41]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,7,9,20]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[5,14,27,39,40,44]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,27,39]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[31,29]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[21,22,33]}],"complexes":[],"partners":["STAT3","MITF","RELA","SMAD3","SMAD6","TRIM8","TRIM32","SMURF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y6X2","full_name":"E3 SUMO-protein ligase PIAS3","aliases":["E3 SUMO-protein transferase PIAS3","Protein inhibitor of activated STAT protein 3"],"length_aa":628,"mass_kda":68.0,"function":"Functions as an E3-type small ubiquitin-like modifier (SUMO) ligase, stabilizing the interaction between UBE2I and the substrate, and as a SUMO-tethering factor. Plays a crucial role as a transcriptional coregulation in various cellular pathways, including the STAT pathway and the steroid hormone signaling pathway. Involved in regulating STAT3 signaling via inhibiting STAT3 DNA-binding and suppressing cell growth. Enhances the sumoylation of MTA1 and may participate in its paralog-selective sumoylation (PubMed:21965678, PubMed:9388184). Sumoylates CCAR2 which promotes its interaction with SIRT1 (PubMed:25406032). Diminishes the sumoylation of ZFHX3 by preventing the colocalization of ZFHX3 with SUMO1 in the nucleus (PubMed:24651376)","subcellular_location":"Cytoplasm; Nucleus; Nucleus speckle","url":"https://www.uniprot.org/uniprotkb/Q9Y6X2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PIAS3","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PIAS3","total_profiled":1310},"omim":[{"mim_id":"605987","title":"PROTEIN INHIBITOR OF ACTIVATED STAT3; PIAS3","url":"https://www.omim.org/entry/605987"},{"mim_id":"604256","title":"BASIC HELIX-LOOP-HELIX FAMILY, MEMBER E40; BHLHE40","url":"https://www.omim.org/entry/604256"},{"mim_id":"102582","title":"SIGNAL TRANSDUCER AND ACTIVATOR OF TRANSCRIPTION 3; STAT3","url":"https://www.omim.org/entry/102582"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PIAS3"},"hgnc":{"alias_symbol":["FLJ14651","ZMIZ5"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y6X2","domains":[{"cath_id":"1.10.720.30","chopping":"2-65","consensus_level":"high","plddt":89.7881,"start":2,"end":65},{"cath_id":"2.60.120.780","chopping":"136-227_236-281","consensus_level":"high","plddt":91.3054,"start":136,"end":281},{"cath_id":"3.30.40.10","chopping":"287-408","consensus_level":"high","plddt":95.5584,"start":287,"end":408}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6X2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6X2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6X2-F1-predicted_aligned_error_v6.png","plddt_mean":69.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PIAS3","jax_strain_url":"https://www.jax.org/strain/search?query=PIAS3"},"sequence":{"accession":"Q9Y6X2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y6X2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y6X2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6X2"}},"corpus_meta":[{"pmid":"9388184","id":"PMC_9388184","title":"Specific 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the interaction occurs only in cells stimulated with ligands that activate STAT3.\",\n      \"method\": \"Co-immunoprecipitation (in vivo), DNA-binding assay, transcriptional reporter assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, DNA-binding assay, and reporter assay in a foundational paper; widely replicated across many subsequent independent labs\",\n      \"pmids\": [\"9388184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The zinc finger protein Gfi-1 physically interacts with PIAS3 (yeast two-hybrid and co-precipitation from eukaryotic cells), co-localizes with PIAS3 in nuclear dot structures, and overcomes PIAS3-mediated inhibition of STAT3 transcriptional activity, enhancing IL-6-dependent T-cell activation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, co-localization (nuclear dots), luciferase reporter assay, primary T-cell activation assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus yeast two-hybrid plus functional reporter, multiple orthogonal methods in one study\",\n      \"pmids\": [\"11060035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PIAS3 directly associates with MITF (microphthalmia transcription factor) via an in vitro pull-down and co-immunoprecipitation from mast cells and melanocytes, blocking MITF DNA-binding activity and inhibiting MITF-mediated transcriptional activation up to 94%.\",\n      \"method\": \"In vitro pull-down, co-immunoprecipitation, gel-shift (EMSA), luciferase reporter assay (co-transfection)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (pulldown, Co-IP, EMSA, reporter) in one study\",\n      \"pmids\": [\"11709556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Estrogen-activated ER induces PIAS3 mRNA expression and increases physical association of PIAS3 with STAT3, blocking STAT3 DNA binding and transactivation in multiple myeloma cells without directly associating with STAT3, identifying PIAS3 as a co-regulator mediating ER-STAT3 cross-talk.\",\n      \"method\": \"Co-immunoprecipitation, EMSA, reporter assay, RT-PCR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP and functional assays in a single lab study\",\n      \"pmids\": [\"11429412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"HMGI-C (a Ras/ERK-inducible protein) interacts with PIAS3 (identified by yeast two-hybrid and co-immunoprecipitation); the HMGI-C·PIAS3 complex cooperatively represses both glucocorticoid receptor/dexamethasone-stimulated α-ENaC transcription and STAT3-mediated transactivation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, transcriptional reporter assay, Northern blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by Co-IP and functional reporter, single lab\",\n      \"pmids\": [\"11390395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PIAS3 was isolated as an IRF-1-binding protein (yeast two-hybrid), also binds SUMO-1 and the E2 enzyme Ubc9, and SUMOylates IRF-1 in a RING-finger domain-dependent manner, thereby repressing IRF-1 transcriptional activity.\",\n      \"method\": \"Yeast two-hybrid, co-expression SUMOylation assay (RING mutant), transcriptional reporter assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Weak — RING domain mutagenesis + SUMOylation assay + reporter, but single lab single study\",\n      \"pmids\": [\"12387893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PIAS3 interacts in vivo and in vitro with the nuclear receptor coactivator TIF2 through a conserved acidic domain of PIAS3; PIAS3 positively or negatively modulates TIF2-mediated ligand-enhanced transcriptional activation depending on the steroid receptor context.\",\n      \"method\": \"Co-immunoprecipitation (in vivo and in vitro), transcriptional reporter assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP (in vivo + in vitro) with functional reporter, single lab\",\n      \"pmids\": [\"12208521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PIAS3 interacts with Smad proteins (most strongly Smad3) at the endogenous level in mammalian cells and in vitro through the C-terminal domain of Smad3; PIAS3 also interacts with p300/CBP via its RING domain, and PIAS3, Smad3 and p300 form a ternary complex that activates TGF-β/Smad transcriptional responses. A RING-domain mutant unable to bind p300/CBP loses this activation.\",\n      \"method\": \"Co-immunoprecipitation (endogenous and exogenous), in vitro binding, mutagenesis (RING domain mutant), transcriptional reporter 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 / Moderate — endogenous Co-IP + in vitro binding + mutagenesis + functional reporter, multiple orthogonal methods in one study\",\n      \"pmids\": [\"14691252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The Zip (leucine zipper) domain of MITF mediates direct interaction with PIAS3; phosphorylation of MITF at Ser409 significantly reduces the PIAS3–MITF interaction and diminishes PIAS3's inhibitory effect on MITF transcriptional activity.\",\n      \"method\": \"In vitro pull-down, co-immunoprecipitation, site-directed mutagenesis (phospho-site mutants), luciferase reporter assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis + pulldown + Co-IP + reporter, single lab\",\n      \"pmids\": [\"14645519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PIAS3 associates with the p65/RelA subunit of NF-κB (via an LXXLL motif in the N-terminal region of PIAS3) in vitro (pull-down) and in vivo (Co-IP), inhibits NF-κB-dependent transcription induced by TNF-α, IL-1β, RANK, TNFR1, CD30, and TRAFs, and interferes with p65 binding to the CBP coactivator. Knockdown of PIAS3 by RNAi reverses this inhibition.\",\n      \"method\": \"Yeast two-hybrid, in vitro pull-down, co-immunoprecipitation, luciferase reporter assay, RNAi knockdown, N-terminal domain mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP + pulldown + reporter + RNAi rescue, multiple orthogonal methods\",\n      \"pmids\": [\"15140884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ATBF1 interacts with PIAS3 (yeast two-hybrid, co-immunoprecipitation) and synergistically enhances PIAS3-mediated inhibition of IL-6-activated STAT3, though ATBF1 alone has no effect on STAT3 signaling.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, luciferase reporter assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — yeast two-hybrid + Co-IP + reporter, single lab\",\n      \"pmids\": [\"14715251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PIAS3 functions as a SUMO-E3 ligase (previously established) and was found to regulate protein stability and function by promoting sumoylation of nuclear proteins; overexpression of PIAS3 induces apoptosis in prostate cancer cell lines in vitro and in vivo.\",\n      \"method\": \"Cell viability/apoptosis assay (in vitro and in vivo xenograft), immunohistochemistry\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — functional phenotype (apoptosis) reported but mechanism not directly tested in this paper; references previously established SUMO ligase activity\",\n      \"pmids\": [\"15138572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In cytokine-stimulated cells (gp130, c-Kit receptor activation), phosphorylation of MITF at Ser409 triggers dissociation of PIAS3 from MITF and its re-association with STAT3, demonstrating ligand-dependent switching of PIAS3 between the two transcription factors.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation analysis, reporter assay in melanoma/mast cells and MITF(di/di) mouse-derived mast cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP under stimulation conditions + genetic model (MITF-di/di lacking Zip domain), two orthogonal approaches\",\n      \"pmids\": [\"15572665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A 50-amino-acid motif (PIAS82-132) containing two α-helices is sufficient for PIAS3 to inhibit both MITF and STAT3; disruption of one helix abolishes PIAS3 inhibitory activity toward both transcription factors, defining a common binding interface.\",\n      \"method\": \"Domain mapping, 3D protein modeling, mutagenesis (helix disruption), reporter assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Weak — mutagenesis + structural modeling + functional reporter, single lab\",\n      \"pmids\": [\"16368885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PIAS3 induces SUMOylation of progesterone receptor B (PRB) at Lys-7, Lys-388, and Lys-531; this SUMOylation inhibits PRB DNA-binding, promotes nuclear export, and represses PRB transactivation of progesterone-responsive genes. The interaction between PIAS3 and PRB is enhanced by progesterone, and PIAS3 is recruited to progesterone-responsive promoters in a hormone-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation (in vitro and in vivo), siRNA knockdown, SUMOylation assay with mutagenesis (Lys→Arg), nuclear export assay, chromatin immunoprecipitation (ChIP), reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro and in vivo SUMOylation assay with site-specific mutagenesis, ChIP, Co-IP, multiple orthogonal methods in one study\",\n      \"pmids\": [\"17020914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PIAS3 interacts with ATF1 (yeast two-hybrid, co-immunoprecipitation) and blocks ATF1 DNA binding to the antioxidant-responsive element (ARE) of the ferritin H gene, reversing ATF1-mediated repression. PIAS3 knockdown decreases basal and oxidative-stress-induced ferritin H expression.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, EMSA, siRNA knockdown, reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid + Co-IP + EMSA + siRNA knockdown, multiple orthogonal methods\",\n      \"pmids\": [\"17565989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Nitric oxide (NO) causes S-nitrosation of PIAS3 at Cys459, which promotes interaction with the ubiquitin E3 ligase TRIM32, leading to PIAS3 ubiquitination and degradation (global hyposumoylation). Mutation of Cys459 abolishes NO-stimulated PIAS3–TRIM32 interaction.\",\n      \"method\": \"S-nitrosation assay, co-immunoprecipitation, site-directed mutagenesis (Cys459), ubiquitination assay, SUMO conjugation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — site-directed mutagenesis identifying the S-nitrosation site + Co-IP + ubiquitination assay, multiple orthogonal methods\",\n      \"pmids\": [\"17987106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRIM8 interacts with PIAS3, causes its proteasomal degradation or nuclear exclusion, cancels the negative effect of PIAS3 on STAT3, and thereby enhances Src-dependent tumorigenesis.\",\n      \"method\": \"Co-immunoprecipitation, ectopic expression, proteasome inhibitor assay, focus formation assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP + proteasome assay + nuclear fractionation + functional tumorigenesis assay, single lab\",\n      \"pmids\": [\"20516148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PIAS3 overexpression in osteoclast-lineage transgenic mice impairs osteoclast differentiation (osteopetrotic phenotype); mechanistically, PIAS3 suppresses RANKL-induced expression of c-Fos and NFATc1 and inhibits MITF transcriptional activity independently of sumoylation. PIAS3 overexpression in osteoblasts also downregulates IL-6-induced RANKL expression, indirectly reducing osteoclastogenesis.\",\n      \"method\": \"Transgenic mouse model (TRAP-promoter-driven PIAS3), RANKL-induced osteoclastogenesis assay, siRNA knockdown, reporter assay, co-culture system\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic model + in vitro knockdown/overexpression + reporter, multiple orthogonal methods\",\n      \"pmids\": [\"18952894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PIAS3 physically interacts with M2-PK (pyruvate kinase M2) and its isoenzyme M1-PK; endogenous SUMO-1–M2-PK conjugates exist in mammalian cells; PIAS3 expression (but not a RING-domain mutant C299S/H301A) is associated with nuclear localization of M2-PK, suggesting PIAS3 SUMOylates M2-PK to promote its nuclear targeting.\",\n      \"method\": \"Co-immunoprecipitation, SUMO conjugation assay, RING domain mutagenesis, subcellular fractionation/co-localization\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP + RING mutant + localization, single lab, no direct SUMOylation site mapping\",\n      \"pmids\": [\"19308990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In EGF-stimulated lung cancer cells, PIAS3 forms a complex with STAT3 dependent on STAT3 Tyr705 phosphorylation; within 5 minutes of EGF treatment the PIAS3–STAT3 complex translocates to the nucleus, then PIAS3 returns to the cytoplasm by 30 minutes. Mutation of Tyr705 to Phe reduces PIAS3–STAT3 binding, nuclear translocation of PIAS3, and PIAS3-mediated reduction of STAT3 transcription.\",\n      \"method\": \"Confocal microscopy, co-immunoprecipitation, site-directed mutagenesis (Y705F STAT3), luciferase reporter assay, cellular fractionation\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis + Co-IP + confocal localization + reporter, multiple orthogonal methods in one study\",\n      \"pmids\": [\"19903771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Pias3 (mouse) is selectively expressed in developing photoreceptors, binds the transcription factors Crx and Nr2e3, is targeted to photoreceptor-specific gene promoters, and SUMOylates Nr2e3, converting it into a potent repressor of cone-specific gene expression. Blocking SUMOylation in photoreceptors produces cells with cone morphological and molecular features and absent rod-specific markers.\",\n      \"method\": \"Co-immunoprecipitation (Pias3 with Crx/Nr2e3), ChIP, in vitro SUMOylation assay, pharmacological SUMOylation blockade, immunofluorescence, gene expression analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro SUMOylation + ChIP + Co-IP + loss-of-function with defined molecular phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"19186166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Pias3-dependent SUMOylation in cone photoreceptors activates M-opsin expression and represses S-opsin expression; the transcription factors Trbeta2 and Rxrgamma mediate preferential Pias3 expression in M cones, and Pias3 directly regulates M and S opsin expression by modulating cone-enriched transcription factors Rxrgamma, Roralpha, and Trbeta1.\",\n      \"method\": \"Conditional knockout/knockdown, reporter assay, ChIP, co-immunoprecipitation, in situ hybridization, electroretinography\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function + ChIP + Co-IP + functional ERG readout, multiple methods\",\n      \"pmids\": [\"20729845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PIAS3 overexpression promotes sumoylation of vimentin at residue 354 (vimentin354) in GBM cells; this sumoylation is associated with inhibition of GBM cell migration and changes in cell shape.\",\n      \"method\": \"Co-immunoprecipitation with SUMO1 antibody, mass spectrometry (proteomic identification), migration assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — proteomics identification + IP + functional migration assay, single lab\",\n      \"pmids\": [\"21317457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PIAS3 overexpression suppresses Akt phosphorylation and renders lung cancer cells sensitive to chemotherapeutic agents; PIAS3 siRNA knockdown accelerates cell proliferation, worsens chemosensitivity, and augments Akt phosphorylation, placing PIAS3 as a regulator of both JAK/STAT and PI3K/Akt signaling.\",\n      \"method\": \"siRNA knockdown, overexpression, Western blot (phospho-Akt), cell growth/viability assay\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — siRNA + overexpression + biochemical readout, single lab, no direct mechanism linking PIAS3 to Akt\",\n      \"pmids\": [\"17032498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PIAS3 interacts with the STAT3 coiled-coil domain via a short fragment of PIAS3's C-terminal acidic region; a recombinant peptide derived from this region (rPP-C8) suppresses STAT3 target gene expression, inhibits migration and proliferation, and induces apoptosis in cancer cells at low concentrations.\",\n      \"method\": \"Domain mapping (deletion analysis), recombinant peptide internalization assay, STAT3 reporter assay, apoptosis/proliferation assays\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping + functional recombinant peptide with defined EC50, single lab, multiple functional readouts\",\n      \"pmids\": [\"20371673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The PINIT domain of PIAS3 (residues 85–272) is a folded monomeric domain that directly binds STAT3 in a concentration-dependent manner; L97A, R99N, and R99Q mutations abrogate STAT3 binding, identifying these residues as part of the PIAS3–STAT3 binding interface.\",\n      \"method\": \"Recombinant protein purification, surface plasmon resonance (SPR), site-directed mutagenesis, homology modeling\",\n      \"journal\": \"Journal of molecular recognition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — SPR binding + mutagenesis + structural modeling, single lab study\",\n      \"pmids\": [\"21812053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PIAS3 functions as a SUMO E3 ligase for the RelA subunit of NF-κB; PIAS3-mediated SUMOylation of endogenous RelA is induced by NF-κB activation (TNFα), forming a negative regulatory feedback loop. RelA mutants resistant to SUMOylation or PIAS3 SUMO-ligase-dead mutants lose this repression. RelA DNA binding is required as a signal for PIAS3-mediated SUMOylation.\",\n      \"method\": \"In vivo SUMOylation assay, site-directed mutagenesis (SUMOylation-site mutant RelA; SUMO-ligase-dead PIAS3), co-immunoprecipitation, reporter assay, IκBα null fibroblasts\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — SUMOylation assay with mutagenesis + genetic model + Co-IP + reporter, multiple orthogonal methods\",\n      \"pmids\": [\"22649547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PIAS3 interacts with the ErbB4 intracellular domain (ICD), promotes its SUMO modification, and drives nuclear sequestration of ErbB4 ICD into PML nuclear bodies. PIAS3 overexpression represses ErbB4 ICD coactivation of transcription with YAP; PIAS3 knockdown partially rescues ErbB4-ICD-mediated inhibition of mammary cell differentiation.\",\n      \"method\": \"Co-immunoprecipitation, SUMOylation assay, fluorescence co-localization (PML bodies), siRNA knockdown, transcriptional co-activation reporter assay, differentiation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP + SUMOylation assay + localization + siRNA rescue + functional differentiation assay, multiple orthogonal methods\",\n      \"pmids\": [\"22584572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PIAS3 promotes homology-directed repair (HR) and non-homologous end joining (NHEJ) of DNA double-strand breaks; PIAS3 overexpression increases resistance of HeLa cells to ionizing radiation.\",\n      \"method\": \"DSB repair reporter assay (HR and NHEJ), colony survival after ionizing radiation\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — reporter assay and clonogenic survival, single lab, no direct molecular mechanism for DSB repair identified\",\n      \"pmids\": [\"24137461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"N-terminal truncation of Stat5a/b, which occurs post-translationally in prostate cancer cells, removes the N-domain required for binding to PIAS3; PIAS3 inhibits full-length Stat5a/b transcriptional activity in breast cancer cells but not in prostate cancer cells that express the truncated form, indicating that proteolytic removal of the N-terminal domain is a mechanism by which Stat5 evades PIAS3-mediated repression.\",\n      \"method\": \"Western blot, EMSA (DNA binding), co-immunoprecipitation, N-terminal domain mutagenesis, reporter assay\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis + Co-IP + EMSA + reporter assay, single lab\",\n      \"pmids\": [\"20854925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PIAS3 is required for ATR checkpoint activation: it is the only PIAS family member indispensable for ATR autophosphorylation in response to UV or HU, and for maintaining basal ATR kinase activity prior to DNA damage. PIAS3 is dispensable for ATRIP SUMOylation and the ATR-ATRIP interaction, but loss of PIAS3 reduces phosphorylation of ATR substrates.\",\n      \"method\": \"siRNA knockdown of each PIAS family member, ATR autophosphorylation assay, substrate phosphorylation assay (Western blot), ATR-ATRIP co-immunoprecipitation, DNA damage induction (CPT, UV, HU)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic knockdown of all PIAS members + biochemical kinase activity assays + multiple DNA damage conditions, single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"26565033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PIAS3 physically interacts with SMAD2/3 (via the SMAD MH2 domain and PIAS3 RING domain) to activate TGF-β signaling, leading to increased TXNIP expression and ferroptotic susceptibility in HCC cells. Knockdown of TXNIP degrades ferroptosis caused by PIAS3 overexpression; forced TXNIP re-expression restores ferroptosis in PIAS3-knockdown cells.\",\n      \"method\": \"Co-immunoprecipitation, RNA-seq, siRNA knockdown/overexpression, ferroptosis functional assays (lipid peroxidation, cell death)\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP (domain mapping) + RNA-seq + epistasis via siRNA rescue, single lab\",\n      \"pmids\": [\"37689128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PIAS3 interacts with EKLF/KLF1 transcription factor (co-immunoprecipitation with exogenous and endogenous proteins); PIAS3 acts as a transcriptional co-repressor of EKLF for β-globin and α-hemoglobin stabilizing protein genes independently of sumoylation. The LXXLL motif of PIAS3 is required for transrepression but not for the EKLF-PIAS3 interaction. PIAS3 occupies the β-globin promoter in undifferentiated erythroid cells (ChIP). PIAS3 knockdown accelerates erythroid differentiation.\",\n      \"method\": \"Co-immunoprecipitation (exogenous and endogenous), ChIP, siRNA knockdown, mutagenesis (LXXLL motif), reporter assay, differentiation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — endogenous Co-IP + ChIP + mutagenesis + siRNA knockdown + functional differentiation, multiple orthogonal methods\",\n      \"pmids\": [\"25713074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PIAS3 enhances HIF-1α transcriptional activity by increasing HIF-1α protein stability through a mechanism independent of PIAS3's SUMO E3 ligase activity; PIAS3 physically associates with HIF-1α, and PIAS3 knockdown destabilizes HIF-1α in a proteasome-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, PIAS3 overexpression/siRNA knockdown, proteasome inhibitor rescue (MG132), RT-PCR, reporter assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP + siRNA + MG132 rescue, single lab\",\n      \"pmids\": [\"26697750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Adenovirus E4-ORF3 specifically sequesters PIAS3 (but not PIAS1, PIAS2, or PIAS4) into a multivalent nuclear matrix, requiring E4-ORF3 polymerization; this PIAS3 targeting is conserved across disparate adenovirus subgroups.\",\n      \"method\": \"Immunofluorescence co-localization, co-immunoprecipitation/pull-down, domain mutants of E4-ORF3 (polymerization-deficient), comparative analysis across adenovirus subgroups\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specificity shown by testing all PIAS family members + domain mutants, single lab\",\n      \"pmids\": [\"26223632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PIAS3 directly sumoylates Smurf2, and sumoylated Smurf2 (with its E3 ubiquitin ligase activity intact) suppresses invasive growth of breast cancer cell-derived organoids. Genetic ablation of PIAS3 removes this non-invasive constraint.\",\n      \"method\": \"SUMOylation assay, E3 ubiquitin ligase activity mutant, 3D organoid invasion assay, siRNA knockdown\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SUMOylation assay + activity mutant + 3D organoid functional assay, single lab\",\n      \"pmids\": [\"28423498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRIM8 activates STAT3 signaling in glioblastoma stem-like cells by suppressing PIAS3 expression, most likely through E3-mediated ubiquitination and proteasomal degradation of PIAS3. TRIM8 knockdown reduces p-STAT3 and stem cell markers; STAT3 activation in turn upregulates TRIM8, forming a positive feedback loop.\",\n      \"method\": \"siRNA knockdown, overexpression, Western blot (p-STAT3, stem markers), self-renewal assay, differentiation assay, co-immunoprecipitation\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional knockdown/overexpression + biochemical readout + functional stem cell assay, single lab\",\n      \"pmids\": [\"28100038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Nuclear Smad6 interacts directly with PIAS3 through Smad6's MH2 domain and PIAS3's RING domain; Smad6 recruits Smurf1 (via its MH2 domain and PY motif) to ubiquitinate and degrade PIAS3, reducing PIAS3-mediated STAT3 inhibition and promoting glioma growth. A transducible Smad6 MH2 protein restores PIAS3 expression and reduces gliomagenesis.\",\n      \"method\": \"Co-immunoprecipitation, domain-deletion mutagenesis, ubiquitination assay, in vivo glioma model, Smad6 MH2 transducible protein rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mutants + ubiquitination assay + in vivo rescue, multiple orthogonal methods\",\n      \"pmids\": [\"29950561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Upon TCR stimulation, PIAS3 (together with PIASxβ) acts as a SUMO E3 ligase for PLC-γ1, promoting its sumoylation at K54, which facilitates PLC-γ1 microcluster assembly and association with SLP76 and Gads adaptors, thereby supporting T cell activation.\",\n      \"method\": \"Co-immunoprecipitation, SUMOylation assay (K54R mutant), confocal imaging (microcluster formation), reporter assay, T cell activation assay\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific SUMOylation mutagenesis + Co-IP + imaging + functional T cell assay, single lab\",\n      \"pmids\": [\"30873169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PIAS3 sumoylates Akt1 at K64 and K276 in response to NMDA receptor-mediated neuronal activity; Akt1 SUMOylation at these sites enhances its kinase activity and T308 phosphorylation. The N-terminal SAP domain of PIAS3 directly binds Akt1; disruption of the Akt1–PIAS3 interaction (using Tat-SAP peptide) inhibits LTP expression and late-phase LTP maintenance in hippocampus, and blocks ERK1/2-BDNF/Arc and mTOR-4E-BP1 cascades.\",\n      \"method\": \"In vivo/in vitro SUMOylation assay (K64R/K276R mutants), co-immunoprecipitation (SAP domain), Tat-fused peptide competition, LTP electrophysiology (hippocampal slices), kinase activity assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — site-specific mutagenesis + Co-IP + domain competition + in vitro kinase assay + electrophysiology LTP readout, multiple orthogonal methods\",\n      \"pmids\": [\"34288124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BDNF signaling via TrkB facilitates nuclear exodus of PIAS3 and its enrichment in neuronal dendrites; dendritic PIAS3 modulates ERK1/2 kinase pathway signaling and inhibits GABAergic neurotransmission. PIAS3 RING and Ser/Thr domains have opposing effects on GABA-mediated inhibition. In ischemia (OGD), BDNF-TrkB signaling impairs gephyrin clustering at GABAergic synapses through SUMOylation.\",\n      \"method\": \"Live imaging (nuclear exodus), immunofluorescence, PIAS3 domain deletion constructs, GABA receptor electrophysiology, gephyrin cluster analysis, OGD model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging of PIAS3 redistribution + domain deletions + electrophysiology + gephyrin mutagenesis, single lab\",\n      \"pmids\": [\"35307349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AMPK activation enhances PIAS3-mediated SUMOylation of Smurf1 at K324, which increases Smurf1 E3 ubiquitin ligase activity, promotes ALK2 proteolysis, and inhibits BMP signaling, thereby suppressing osteogenic differentiation and traumatic heterotopic ossification. AMPK increases the association between PIAS3 and AMPK.\",\n      \"method\": \"Co-immunoprecipitation, SUMOylation assay (K324R Smurf1 mutant), BMP signaling reporter, osteogenic differentiation assay, ALK2 ubiquitination/degradation assay, heterotopic ossification model\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific SUMOylation mutagenesis + Co-IP + functional differentiation assay, single lab\",\n      \"pmids\": [\"38844181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PIAS3 (also known as KChAP) is a bona fide SUMO E3 ligase for the cardiac potassium channels Kv4.2 and HCN2 in HEK cells, and for endogenous Kv4.2 and Kv4.3 in cardiomyocytes. PIAS3-mediated SUMOylation at Kv4.2-K579 increases channel surface expression via a Rab11a-dependent recycling mechanism. PKA phosphorylation at Kv4.2-S552 blocks K579 SUMOylation, reducing Kv4 current, thus PKA and PIAS3 act antagonistically to control channel surface expression.\",\n      \"method\": \"In vitro and cell-based SUMOylation assay (K579R mutant), cardiomyocyte overexpression/knockdown, Rab11a dependence assay, PKA phosphorylation (S552A mutant), electrophysiology (current measurement), surface biotinylation\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — site-specific mutagenesis + in vitro SUMOylation + electrophysiology + surface trafficking assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"39223673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PIAS3 sumoylates MLK3 at K401 (SUMO1 conjugation) following brain ischemia/reperfusion; this SUMOylation promotes MLK3 kinase activation and downstream p38/JNK signaling, leading to neuronal apoptosis. The PINIT domain of PIAS3 mediates direct interaction with MLK3. Overexpression of the PINIT domain (as a dominant negative) disrupts MLK3–PIAS3 interaction, inhibits MLK3 SUMOylation, suppresses downstream signaling, and reduces brain lesion and behavioral deficits in rodent ischemic models.\",\n      \"method\": \"Co-immunoprecipitation, SUMOylation assay (K401R mutant), PIAS3 domain competition (PINIT overexpression), p38/JNK phosphorylation assay, in vivo ischemia model, behavioral testing\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — site-specific SUMOylation mutagenesis + domain competition + Co-IP + in vivo model + functional behavioral readout, multiple orthogonal methods\",\n      \"pmids\": [\"38456949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PIAS3 acts as a zinc sensor: zinc deficiency induces ubiquitination and proteasomal degradation of PIAS3 through its RING finger domain (which contains zinc-binding sites); PIAS3 loss relieves STAT3 inhibition, activating ZIP-family zinc transporter gene expression to restore zinc homeostasis. PIAS3 with a zinc-binding site mutation (PIAS3-Mut) or RING domain deletion is resistant to zinc-deficiency-induced degradation. PIAS3-Mut overexpression worsens myocardial I/R injury.\",\n      \"method\": \"Site-directed mutagenesis (zinc-binding site mutant, RING domain deletion), ubiquitination assay, PIAS3 knockdown/overexpression, cardiac zinc measurement, mouse I/R model (infarct size), STAT3 activation assay\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — site-directed mutagenesis of RING/zinc sites + ubiquitination assay + in vivo cardiac model + multiple functional readouts, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"38750767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"METTL10 methylates PIAS3 at lysine 442 (K442), which disrupts the PIAS3–MITF interaction; as a result, PIAS3-mediated SUMOylation and ubiquitination of MITF are reduced, stabilizing MITF and activating purine metabolism in gastric cancer cells.\",\n      \"method\": \"Mass spectrometry (methylation site identification), co-immunoprecipitation (PIAS3–MITF interaction after K442 methylation), SUMOylation/ubiquitination assay, MITF stability assay\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — PTM site identification by MS + Co-IP + SUMOylation assay, single lab study\",\n      \"pmids\": [\"41114928\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PIAS3 is a multifunctional SUMO E3 ligase and transcriptional co-regulator that inhibits STAT3, NF-κB/RelA, MITF, IRF-1, Stat5a/b, progesterone receptor B, and EKLF by direct binding and/or SUMOylation; it activates TGF-β/Smad transcriptional responses, potentiates HIF-1α stability, SUMOylates diverse substrates (Nr2e3, vimentin, M2-PK, ErbB4 ICD, PLC-γ1, Akt1, MLK3, Kv4.2/HCN2 channels, Smurf1/2, RelA), and is itself regulated by S-nitrosation (Cys459)–driven ubiquitination via TRIM32, by TRIM8/Smad6-Smurf1 ubiquitin-mediated degradation, by zinc deficiency (RING-domain-dependent degradation), by YB1-mediated mRNA decay, and by METTL10-mediated K442 methylation that blocks its interaction with MITF; PIAS3's nucleo-cytoplasmic shuttling is ligand-dependent and tied to STAT3 Tyr705 phosphorylation, and it plays defined roles in photoreceptor specification (rod vs. cone fate), DNA damage/ATR checkpoint priming, synaptic LTP, osteoclastogenesis, and cardiac ion channel surface expression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PIAS3 is a nuclear SUMO E3 ligase and transcriptional co-regulator that controls signal-dependent gene expression by directly binding transcription factors and/or conjugating SUMO to a broad range of substrates [#0, #5, #14]. Its founding activity is direct binding to ligand-activated STAT3, which blocks STAT3 DNA binding and transactivation; this interaction depends on STAT3 Tyr705 phosphorylation and on a PINIT-domain interface (residues 85\\u2013272, including L97 and R99), with a short C-terminal acidic fragment additionally engaging the STAT3 coiled-coil domain [#0, #20, #26, #25]. PIAS3 represses an overlapping set of transcription factors\\u2014MITF through its leucine-zipper, plus NF-\\u03baB/RelA via an N-terminal LXXLL motif, IRF-1, ATF1, Stat5a/b, progesterone receptor B, and EKLF/KLF1\\u2014using both SUMOylation-dependent and SUMOylation-independent modes, and a single short helical motif (residues 82\\u2013132) suffices to inhibit both MITF and STAT3 [#2, #9, #5, #15, #30, #14, #33, #13]. Beyond repression, PIAS3 activates TGF-\\u03b2/SMAD transcription by forming a SMAD3\\u2013p300 ternary complex through its RING domain and potentiates HIF-1\\u03b1 by stabilizing the protein independently of ligase activity [#7, #32, #34]. As a ligase it SUMOylates Nr2e3, RelA, vimentin, ErbB4 ICD, M2-PK, PLC-\\u03b31, Akt1, MLK3, the cardiac channel Kv4.2, and Smurf1/2, thereby governing photoreceptor rod-versus-cone fate, T-cell PLC-\\u03b31 microcluster assembly, hippocampal LTP via Akt1, ischemic neuronal apoptosis via MLK3, and Kv4 channel surface trafficking [#21, #27, #23, #28, #19, #39, #40, #44, #43, #36, #42]. PIAS3 abundance is tightly controlled: it is degraded following Cys459 S-nitrosation/TRIM32 recruitment, by TRIM8 and by Smad6-recruited Smurf1, by RING-domain-dependent degradation under zinc deficiency (acting as a zinc sensor that relieves STAT3 inhibition), and its MITF interaction is blocked by METTL10-mediated K442 methylation [#16, #17, #38, #45, #46]. PIAS3 also functions in genome maintenance, being uniquely required among PIAS proteins for ATR checkpoint kinase activation [#31].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established PIAS3's founding function: a specific endogenous inhibitor of activated STAT3, defining a post-translational brake on cytokine transcriptional signaling.\",\n      \"evidence\": \"Co-IP, DNA-binding, and reporter assays in ligand-stimulated cells\",\n      \"pmids\": [\"9388184\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether inhibition requires SUMO ligase activity\", \"Binding interface on PIAS3 not mapped\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Extended PIAS3's repressor repertoire to MITF, showing it blocks DNA binding of a second lineage-determining transcription factor.\",\n      \"evidence\": \"In vitro pull-down, Co-IP, EMSA, and reporter assays in mast cells/melanocytes\",\n      \"pmids\": [\"11709556\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether MITF inhibition involves SUMOylation\", \"Did not address how PIAS3 chooses between MITF and STAT3\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined PIAS3 biochemically as a SUMO E3 ligase, linking its transcriptional repression to RING-dependent SUMO conjugation of a substrate (IRF-1).\",\n      \"evidence\": \"Yeast two-hybrid, SUMO-1/Ubc9 binding, RING-mutant SUMOylation and reporter assays\",\n      \"pmids\": [\"12387893\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"SUMO acceptor lysines on IRF-1 not mapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Revealed PIAS3 is not solely a repressor: through its RING domain it bridges SMAD3 and p300/CBP to activate TGF-\\u03b2 transcription, establishing context-dependent dual function.\",\n      \"evidence\": \"Endogenous Co-IP, in vitro binding, RING-domain mutagenesis, reporter assays\",\n      \"pmids\": [\"14691252\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not determine whether SMAD3 is itself SUMOylated\", \"Structural basis of ternary complex unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapped the molecular logic of PIAS3 target switching and broadened it to NF-\\u03baB, showing PIAS3 inhibits RelA via an N-terminal LXXLL motif and that MITF Ser409 phosphorylation hands PIAS3 from MITF to STAT3.\",\n      \"evidence\": \"Domain mapping, pull-down, Co-IP, RNAi, reporter assays in melanoma/mast cells\",\n      \"pmids\": [\"15140884\", \"15572665\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of competing complexes not quantified\", \"Whether RelA inhibition required SUMOylation not yet tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Localized a single short helical motif (residues 82\\u2013132) sufficient to inhibit both MITF and STAT3, defining a shared inhibitory interface.\",\n      \"evidence\": \"Domain mapping, 3D modeling, helix-disruption mutagenesis, reporter assays\",\n      \"pmids\": [\"16368885\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure\", \"Single lab\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated PIAS3 represses a nuclear receptor (PRB) by site-specific SUMOylation that drives nuclear export, connecting ligase activity to hormone-dependent promoter recruitment.\",\n      \"evidence\": \"In vitro/in vivo SUMOylation with Lys mutants, ChIP, nuclear export and reporter assays\",\n      \"pmids\": [\"17020914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO isoform specificity not resolved\", \"Generality across other nuclear receptors not tested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified the first PIAS3 degradation pathway, showing redox sensing through Cys459 S-nitrosation triggers TRIM32-mediated ubiquitination and global hyposumoylation.\",\n      \"evidence\": \"S-nitrosation assay, Cys459 mutagenesis, Co-IP, ubiquitination and SUMO-conjugation assays\",\n      \"pmids\": [\"17987106\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological NO sources driving this in vivo not defined\", \"Downstream desumoylated targets not enumerated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established that the PIAS3-STAT3 complex shuttles nucleo-cytoplasmically in a STAT3 Tyr705-phosphorylation-dependent manner, linking PIAS3 trafficking to receptor activation kinetics.\",\n      \"evidence\": \"Confocal imaging, Y705F mutagenesis, Co-IP, fractionation, reporter assays in EGF-stimulated lung cancer cells\",\n      \"pmids\": [\"19903771\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear import/export machinery for PIAS3 not identified\", \"Whether shuttling applies to non-STAT3 partners unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined PIAS3's role in photoreceptor cell-fate specification by SUMOylating Nr2e3 to enforce rod identity and repress cone genes.\",\n      \"evidence\": \"Co-IP with Crx/Nr2e3, ChIP, in vitro SUMOylation, pharmacological SUMO blockade with phenotype\",\n      \"pmids\": [\"19186166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO acceptor site on Nr2e3 not mapped in this study\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended the retinal program to cone subtype patterning, showing Pias3-dependent SUMOylation tunes M- versus S-opsin via cone-enriched nuclear receptors.\",\n      \"evidence\": \"Conditional knockout/knockdown, ChIP, Co-IP, in situ hybridization, electroretinography\",\n      \"pmids\": [\"20729845\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SUMO substrates among Rxrgamma/Roralpha/Trbeta1 not fully resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Closed the NF-\\u03baB regulatory loop by showing PIAS3 acts as a DNA-binding-dependent SUMO E3 ligase for RelA, forming a negative feedback brake on inflammatory transcription.\",\n      \"evidence\": \"In vivo SUMOylation with RelA and ligase-dead mutants, Co-IP, reporter assays in I\\u03baB\\u03b1-null fibroblasts\",\n      \"pmids\": [\"22649547\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO acceptor lysine on RelA not specified here\", \"Kinetics of feedback in primary immune cells untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed PIAS3 controls ErbB4 ICD nuclear fate by SUMO-driven sequestration into PML bodies, repressing its transcriptional coactivation and gating mammary differentiation.\",\n      \"evidence\": \"Co-IP, SUMOylation assay, PML-body co-localization, siRNA rescue, differentiation assays\",\n      \"pmids\": [\"22584572\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ErbB4 ICD SUMO site not mapped\", \"Mechanism of PML targeting unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified PIAS3 as the unique PIAS member required for ATR checkpoint kinase activation, placing it in the DNA-damage response independent of ATRIP SUMOylation.\",\n      \"evidence\": \"Systematic siRNA of all PIAS members, ATR autophosphorylation and substrate assays under UV/HU/CPT\",\n      \"pmids\": [\"26565033\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SUMO substrate priming ATR not identified\", \"Mechanism of basal ATR activity maintenance unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated SUMOylation-independent co-repression of EKLF/KLF1 controlling erythroid differentiation, and a SUMO-independent stabilization of HIF-1\\u03b1, broadening PIAS3's non-ligase functions.\",\n      \"evidence\": \"Endogenous Co-IP, ChIP, LXXLL mutagenesis, siRNA differentiation assays; HIF-1\\u03b1 Co-IP and MG132 rescue\",\n      \"pmids\": [\"25713074\", \"26697750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PIAS3 stabilizes HIF-1\\u03b1 mechanistically unresolved\", \"Distinction between ligase-dependent and -independent target classes not systematized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a second ubiquitin-mediated PIAS3 degradation route through Smad6-recruited Smurf1, mechanistically linking PIAS3 loss to STAT3 hyperactivation and glioma growth.\",\n      \"evidence\": \"Co-IP with domain mutants, ubiquitination assay, in vivo glioma model, Smad6 MH2 rescue\",\n      \"pmids\": [\"29950561\", \"20516148\", \"28100038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hierarchy among TRIM8/TRIM32/Smurf1 degradation routes unclear\", \"Tissue-specific dominance of each pathway untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established neuronal SUMO-ligase functions, showing PIAS3 SUMOylates Akt1 to enhance kinase activity and support hippocampal LTP, while its TrkB-driven dendritic redistribution modulates ERK and GABAergic transmission.\",\n      \"evidence\": \"Site-specific SUMOylation mutants, SAP-domain Co-IP, Tat-peptide competition, LTP electrophysiology and live imaging\",\n      \"pmids\": [\"34288124\", \"35307349\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous SUMO machinery dynamics in dendrites not resolved\", \"Opposing RING vs Ser/Thr domain effects on GABA mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed PIAS3 as a zinc sensor whose RING-domain-dependent degradation under zinc deficiency relieves STAT3 inhibition to restore zinc homeostasis, with cardiac ischemia consequences.\",\n      \"evidence\": \"Zinc-binding-site and RING-deletion mutants, ubiquitination assay, mouse I/R model, STAT3 activation\",\n      \"pmids\": [\"38750767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin ligase mediating zinc-deficiency degradation not identified\", \"Direct zinc-occupancy measurement on PIAS3 not provided\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended PIAS3 SUMO targets to a cardiac ion channel and to the MLK3 stress kinase, controlling Kv4 surface trafficking and ischemic neuronal apoptosis respectively.\",\n      \"evidence\": \"Site-specific SUMOylation mutants (Kv4.2-K579, MLK3-K401), electrophysiology, surface biotinylation, in vivo ischemia and behavior\",\n      \"pmids\": [\"39223673\", \"38456949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same PIAS3 pool serves nuclear and membrane substrates unknown\", \"Regulation balancing channel-promoting vs apoptosis-promoting SUMOylation untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed METTL10-mediated K442 methylation of PIAS3 disrupts its MITF binding, stabilizing MITF and rewiring purine metabolism, adding a methylation switch to PIAS3 regulation.\",\n      \"evidence\": \"MS site identification, Co-IP after K442 methylation, SUMOylation/ubiquitination and MITF stability assays\",\n      \"pmids\": [\"41114928\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Whether K442 methylation affects non-MITF substrates untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PIAS3 selects between SUMO-ligase-dependent and -independent modes, and what governs partitioning of a single PIAS3 pool among its many nuclear, cytoplasmic, membrane, and synaptic substrates, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying model for ligase-dependent vs -independent target choice\", \"No high-resolution structure of full-length PIAS3 with a substrate\", \"Substrate-specific recruitment determinants largely unmapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [5, 14, 21, 27, 39, 40, 43, 44]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 2, 9, 7, 33]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 9, 31, 34]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [27, 36, 42, 43]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 14, 21]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [20, 41]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 7, 9, 20]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 14, 27, 39, 40, 44]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 27, 39]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [31, 29]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [21, 22, 33]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"STAT3\", \"MITF\", \"RELA\", \"SMAD3\", \"SMAD6\", \"TRIM8\", \"TRIM32\", \"SMURF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}