{"gene":"SIAH1","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":2005,"finding":"S-nitrosylation of GAPDH at Cys-150 triggers its binding to Siah1; Siah1's nuclear localization signal mediates nuclear translocation of the GAPDH-Siah1 complex, where Siah1 stabilizes GAPDH and facilitates degradation of nuclear proteins, initiating apoptotic cell death.","method":"Co-IP, S-nitrosylation assay, nuclear fractionation, NO deletion experiments in macrophages and neurons","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with functional consequence, replicated in multiple cell types with NO deletion controls","pmids":["15951807"],"is_preprint":false},{"year":2001,"finding":"Siah-1 forms a multiprotein SCF-like E3 ligase complex with SIP (a Sgt1 homolog that binds Skp1) and the F-box protein Ebi to degrade beta-catenin independently of GSK3beta-mediated phosphorylation; Siah-1 expression is induced by p53, linking genotoxic stress to beta-catenin destruction.","method":"Co-IP, protein interaction mapping, beta-catenin degradation assay, p53 induction assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, functional degradation assay, independently replicated in same issue","pmids":["11389839","11389840"],"is_preprint":false},{"year":2001,"finding":"Siah-1 interacts with the C-terminus of APC and promotes phosphorylation-independent, beta-TrCP-independent degradation of beta-catenin; demonstrated functionally by hypodorsalization of Xenopus embryos.","method":"Co-IP, beta-catenin degradation assay, Xenopus embryo functional assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — Co-IP plus in vivo functional validation in Xenopus, replicated alongside companion paper","pmids":["11389840"],"is_preprint":false},{"year":1999,"finding":"Siah-1 N-terminal RING finger domain is required for proteolysis of target proteins (e.g., DCC); C-terminal domain mediates oligomerization with itself and other Sina/Siah proteins and binding to substrates. RING domain mutations stabilize Siah-1 itself, indicating auto-ubiquitination. A dominant-negative C-terminal mutant stabilizes DCC endogenously.","method":"Mutagenesis, proteasome inhibitor assays, DCC degradation assay, antisense approach","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — active-site mutagenesis with defined substrate degradation assay and multiple orthogonal methods","pmids":["9858595"],"is_preprint":false},{"year":2008,"finding":"Siah-1 directly interacts with and polyubiquitinates HIPK2, targeting it for proteasomal degradation in unstressed cells. DNA damage triggers ATM/ATR-dependent phosphorylation of Siah-1 at Ser19, disrupting the HIPK2-Siah-1 complex and stabilizing HIPK2 for apoptotic signaling.","method":"Co-IP, ubiquitination assay, Siah-1 knockdown, kinase assay, phospho-site mutagenesis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including phospho-site mutagenesis and functional rescue experiments","pmids":["18536714"],"is_preprint":false},{"year":2016,"finding":"PINK1, synphilin-1, and SIAH-1 form a complex constituting a parkin-independent mitophagy pathway: synphilin-1 recruits SIAH-1 to mitochondria where it promotes mitochondrial protein ubiquitination and mitophagy; catalytically inactive SIAH-1 mutant abrogates this pathway.","method":"Co-IP, LC3/Lamp1 recruitment assay, Atg5 knockdown, catalytic-dead mutant, PINK1 disease mutant analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, genetic epistasis with PINK1 disease mutants and catalytic-dead SIAH1","pmids":["27334109"],"is_preprint":false},{"year":2007,"finding":"Siah-1 binds alpha-synuclein, recruits E2 enzyme UbcH8, and catalyzes mono- and di-ubiquitination of alpha-synuclein in vivo; this ubiquitination does not target alpha-synuclein for proteasomal degradation but promotes its aggregation and cytotoxicity. The PD-linked A30P mutation disrupts Siah-1-mediated ubiquitination.","method":"Co-IP, in vivo ubiquitination assay, PD mutant analysis, aggregation assay, cell viability assay","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — in vivo ubiquitination with E2 identification, PD mutant mechanistic analysis, multiple readouts","pmids":["18065497"],"is_preprint":false},{"year":2003,"finding":"Siah-1 interacts with synphilin-1 via its substrate-binding domain (C-terminus of Siah-1 binds N-terminus of synphilin-1) and ubiquitinates synphilin-1 via its RING finger domain, promoting synphilin-1 degradation via the ubiquitin-proteasome pathway more efficiently than Parkin; Siah-1 abrogates synphilin-1's inhibitory effect on dopamine release.","method":"Yeast two-hybrid, Co-IP in rat brain, ubiquitination assay, domain mapping, dopamine release assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — endogenous Co-IP in brain tissue, domain mapping, functional consequence measured","pmids":["14506261"],"is_preprint":false},{"year":2010,"finding":"Siah-1 alone can directly polyubiquitinate non-phosphorylated beta-catenin in vitro; TBL1 competes with Siah-1 for the same armadillo repeat domain of beta-catenin, protecting it from Siah-1-mediated ubiquitination and proteasomal degradation during Wnt signaling.","method":"In vitro ubiquitination assay with purified proteins, Co-IP, proteasomal degradation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro ubiquitination with purified components, confirmed in cells","pmids":["20181957"],"is_preprint":false},{"year":2005,"finding":"SIP engages Siah1 via two elements: an N-terminal dimerization domain that sits across the saddle-shaped upper surface of Siah1 with PXAXVXP motif legs, and a C-terminal Skp1-binding domain that protrudes from the lower surface of Siah1, forming the scaffold for bringing substrate and E2 into apposition.","method":"Crystal structure, site-directed mutagenesis, functional cell-based assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with mutagenesis validation and functional assay","pmids":["16085652"],"is_preprint":false},{"year":2002,"finding":"Structural analysis of Siah1 dimer reveals a large electronegative beta-sheet concavity across the dimer interface that mediates interaction with SIP; site-directed mutagenesis of these electronegative residues abolishes Siah1-SIP binding in vitro and in cells.","method":"Structure-based approach, site-directed mutagenesis, in vitro and cell binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — structure-guided mutagenesis with functional validation","pmids":["12421809"],"is_preprint":false},{"year":2001,"finding":"Siah-1 directly interacts with and promotes proteasomal degradation of the cell fate regulator Numb; Siah-1-mediated Numb degradation causes redistribution of Notch from cell surface to cytoplasm/nucleus and augments Notch-regulated transcriptional activity.","method":"Co-IP, pulldown, degradation assay, Notch signaling reporter assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — direct interaction plus functional pathway consequence demonstrated","pmids":["11752454"],"is_preprint":false},{"year":2001,"finding":"Siah-1 interacts with the transcriptional coactivator OBF-1 via its C-terminal domain; this interaction leads to proteasomal degradation of OBF-1 protein and reduction in octamer site-dependent transcription. Inhibition of ubiquitin-proteasome pathway elevates OBF-1 protein in B cells.","method":"Co-IP, domain mapping, OBF-1 degradation assay, transcription reporter assay, proteasome inhibitor","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — Co-IP with domain mapping, functional transcription assay, proteasome inhibitor validation","pmids":["11483517"],"is_preprint":false},{"year":2012,"finding":"Siah1 is the E3 ubiquitin ligase for ELL2 polyubiquitination and proteasomal degradation; Siah1 cannot access ELL2 bound to AFF4 within the Super Elongation Complex (SEC). Prostratin and HMBA activate HIV transcription by decreasing Siah1 expression and ELL2 polyubiquitination.","method":"Co-IP, in vivo ubiquitination assay, SEC assembly assay, Siah1 knockdown/overexpression","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, structure-function relationship with AFF4-bound ELL2 defined","pmids":["22483617"],"is_preprint":false},{"year":2005,"finding":"Siah1 is a binding partner of POSH scaffold protein; Siah1 contributes to apoptosis by activating the JNK pathway in a manner requiring its E3 ligase activity. Apoptotic stimuli stabilize Siah1 protein via JNK pathway activation and POSH interaction; SIAH1 stabilization is enhanced by phosphorylation at Tyr100 and Tyr126.","method":"Co-IP, JNK pathway assays, siRNA knockdown, phospho-site analysis, cell death assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — Co-IP, E3-dead mutant, siRNA depletion, phospho-site mutagenesis with functional consequence","pmids":["16230351"],"is_preprint":false},{"year":2000,"finding":"SIAH-1 interacts with alpha-tubulin and degrades the chromokinesin Kid via the ubiquitin-proteasome pathway during mitosis; N-terminal RING domain is required for Kid degradation. SIAH-1 overexpression causes mitotic alterations including multinucleated giant cells.","method":"Yeast two-hybrid, ubiquitin-proteasome degradation assay, N-terminal deletion mutant, confocal microscopy","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — yeast two-hybrid plus functional degradation assay, single lab","pmids":["11146551"],"is_preprint":false},{"year":2009,"finding":"SIAH-1 facilitates EB3 polyubiquitination and proteasomal degradation; Aurora-A and Aurora-B phosphorylate EB3 at Ser-176 during mitosis, triggering disruption of the EB3-SIAH-1 complex and EB3 stabilization during mitosis with subsequent degradation at G1.","method":"Co-IP, ubiquitination assay, SIAH-1 knockdown, kinase assay, phospho-site mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including kinase assay and phospho-site mutagenesis with functional consequence","pmids":["19696028"],"is_preprint":false},{"year":2006,"finding":"Siah-1 interacts with and ubiquitinates FIH (factor inhibiting HIF-1alpha) via its RING finger domain, binding the JmjC domain of FIH through its substrate-binding domain, and promotes FIH degradation via the ubiquitin-proteasome pathway, thereby regulating HIF-1alpha transcriptional activity.","method":"Co-IP, ubiquitination assay, domain mapping, Siah-1 siRNA knockdown, proteasome inhibitor","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination assay, knockdown, single lab","pmids":["17188242"],"is_preprint":false},{"year":2006,"finding":"EBV LMP1 up-regulates Siah1 E3 ubiquitin ligase by enhancing its stability; elevated Siah1 then promotes proteasomal degradation of prolyl hydroxylases PHD1 and PHD3, preventing VHL/HIF-1alpha complex formation and stabilizing HIF-1alpha to drive angiogenesis.","method":"Co-IP, proteasomal degradation assay, Siah1 knockdown/overexpression, VHL co-IP","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus functional pathway demonstration, single lab","pmids":["17047048"],"is_preprint":false},{"year":2003,"finding":"SIAH1 interacts with and promotes ubiquitin-proteasome-mediated degradation of CtIP (CtBP-interacting protein); SIAH-1 interaction with CtIP leads to p21(Waf1) induction, but this induction does not require CtIP degradation (a RING-deleted mutant also induces p21).","method":"Yeast two-hybrid, Co-IP, ubiquitination/degradation assay, RING deletion mutant, luciferase reporter","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination assay, domain mutant analysis, single lab","pmids":["14654780"],"is_preprint":false},{"year":2004,"finding":"SIAH1 binds an octapeptide sequence in T-STAR and targets it for proteasome-dependent degradation; rodent T-STAR orthologs are not degraded unless humanized at the SIAH1-binding site. SIAH1-mediated T-STAR degradation modulates alternative splicing activity.","method":"Yeast two-hybrid, domain/peptide mapping, degradation assay, alternative splicing minigene assay","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — domain mapping, species-swap mutagenesis, functional splicing assay with orthogonal methods","pmids":["15163637"],"is_preprint":false},{"year":2008,"finding":"SIAH1 interacts with and ubiquitinates TRB3 (Tribbles 3 homolog), targeting it for proteasome-dependent degradation; SIAH1-induced degradation of TRB3 counteracts TRB3-mediated upregulation of TGF-beta signaling.","method":"Yeast two-hybrid, Co-IP, ubiquitination assay, TGF-beta signaling reporter","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and in vitro/in vivo ubiquitination, single lab","pmids":["18276110"],"is_preprint":false},{"year":2011,"finding":"Siah-1 polyubiquitinates and promotes proteasomal degradation of ELL (ELL1), regulated by site-specific acetylation (p300-mediated) and deacetylation (HDAC3-mediated) of ELL; acetylated ELL is more stable because deacetylation by HDAC3 enables Siah1-mediated polyubiquitination. DBC1 competes with HDAC3 for ELL binding, stabilizing ELL.","method":"Co-IP, ubiquitination assay, acetylation assay, siRNA knockdown, domain competition assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing acetylation-ubiquitination crosstalk for ELL stability via Siah1","pmids":["32152128"],"is_preprint":false},{"year":2011,"finding":"Siah-1 polyubiquitinates PML-RARα for proteasomal degradation together with E2 enzyme UBCH8; this is distinct from TRIAD1, which binds but does not degrade PML-RARα.","method":"Co-IP, ubiquitination assay, comparison with TRIAD1","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — ubiquitination assay with E2 partner identified, single lab","pmids":["22037423"],"is_preprint":false},{"year":2011,"finding":"SIAH-1 interacts with and promotes proteasomal degradation of HBx (hepatitis B viral X protein) via polyubiquitylation, thereby attenuating HBx-dependent transactivation of GRE, HSE, and CRE signal pathways; SIAH-1 participates in p53-mediated HBx degradation.","method":"Co-IP, ubiquitination assay, transcriptional reporter assay, p53 pathway analysis","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination, functional transcription assay, single lab","pmids":["21878328"],"is_preprint":false},{"year":2004,"finding":"Siah-1 interacts with the intracellular C-terminal domain of polycystin-1 and promotes its ubiquitination and proteasomal degradation, shortening its half-life.","method":"Yeast two-hybrid, Co-IP, ubiquitination assay, half-life assay","journal":"Journal of the American Society of Nephrology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus ubiquitination and half-life assay, single lab","pmids":["15284290"],"is_preprint":false},{"year":2011,"finding":"SIAH-1 interacts with and promotes ubiquitylation and proteasomal degradation of HSV ICP0; the virus-host interaction stabilizes SIAH-1 and recruits it into ICP0-containing nuclear bodies. Knockdown of SIAH-1 increases ICP0 levels and stability.","method":"Co-IP, in vitro and in vivo ubiquitination assay, SIAH-1 knockdown, nuclear body imaging","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, in vitro ubiquitination, knockdown with functional consequence, single lab","pmids":["21632771"],"is_preprint":false},{"year":2009,"finding":"Siah1, interacting with Siah-interacting protein (SIP/CacyBP), promotes proteasome-dependent degradation of cytoplasmic p27 under glucose starvation, thereby regulating cell motility. SIP-/- fibroblasts have increased cytoplasmic p27 and enhanced cell motility.","method":"Ubiquitination assay, SIP-/- MEFs, glucose starvation, cell motility assay","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 — genetic knockout cells with functional motility readout, single lab","pmids":["21734459"],"is_preprint":false},{"year":2014,"finding":"High levels of ER stress induce Siah1/2 transcription via PERK/ATF4 and IRE1/sXBP1 UPR transducers; Siah1/2 in turn attenuates proline hydroxylation of ATF4, stabilizing it and augmenting ER stress-induced cell death. Siah1a+/-::Siah2-/- mice show reduced infarct volume after neuronal ischemia.","method":"UPR pathway analysis, siRNA knockdown, Siah1a/2 knockout mice, ischemia model","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple methods including in vivo mouse ischemia model, genetic knockouts, pathway epistasis","pmids":["24809345"],"is_preprint":false},{"year":2009,"finding":"siah-1 is required for high glucose-induced GAPDH nuclear accumulation and cell death in Müller cells; under hyperglycemic conditions, siah-1 forms a complex with GAPDH and localizes predominantly in the nucleus. Siah-1 knockdown prevents GAPDH nuclear accumulation and inhibits p53 phosphorylation and cell death.","method":"siRNA knockdown, Co-IP, nuclear fractionation, apoptosis assay, p53 phosphorylation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — siRNA knockdown with multiple functional readouts, mechanistic link to p53 established","pmids":["19940145"],"is_preprint":false},{"year":2012,"finding":"B23/nucleophosmin binds both SIAH1 and GAPDH in the nucleus; S-nitrosylation of B23 at Cys275 (by trans-nitrosylation from GAPDH) enhances B23-SIAH1 binding, disrupts SIAH1-GAPDH complex, and abrogates SIAH1 E3 ligase activity, providing neuroprotection.","method":"Co-IP, S-nitrosylation assay, site-directed mutagenesis (C275S), in vivo NMDA neurotoxicity model","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — biochemical reconstitution of trans-nitrosylation, mutagenesis, in vivo rescue","pmids":["23027902"],"is_preprint":false},{"year":2014,"finding":"ASK1 (apoptosis signal-regulating kinase 1) interacts with both GAPDH and Siah1; ASK1 phosphorylates Siah1 at Thr70/Thr74 and Thr235/Thr239, triggering GAPDH-Siah1 stress signaling and activating nuclear p300 acetyltransferase.","method":"Co-IP, in vitro kinase assay, phospho-site mutagenesis, p300 activation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — kinase assay with phospho-site mapping, single lab","pmids":["25391652"],"is_preprint":false},{"year":2008,"finding":"S100A6 interacts with the SIP C-terminal domain (residues 189-219) in a bimodal fashion determined by NMR structure; the first helix binds S100A6 canonically while the second helix contacts the S100A6 dimer interface in a novel mode. S100A6-SIP interaction modulates SCF-TBL1 E3 ligase activity.","method":"NMR structure, isothermal titration calorimetry, structure-based mutagenesis, cell-based functional assay","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — NMR structure with mutagenesis and functional validation","pmids":["18803400"],"is_preprint":false},{"year":2018,"finding":"PARP1 suppresses Siah1 expression at both mRNA level (coordinating with co-repressor NCoR) and protein level (promoting PARylation-dependent ubiquitination/proteolysis of Siah1), thereby increasing ELL2 levels and promoting HIV-1 transcription via ELL2-SEC.","method":"Siah1 mRNA/protein level assays, NCoR Co-IP, PARylation assay, HIV-1 transcription assay","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — multiple mechanisms tested, but PARdU of Siah1 described as 'likely', single lab","pmids":["29949759"],"is_preprint":false},{"year":2020,"finding":"Host cell factors HCF1 and HCF2 bind and block the substrate-binding domain (SBD) of Siah1/2 to prevent auto-ubiquitination and trans-ubiquitination of ELL2, stabilizing ELL2 and enhancing ELL2-SEC formation for HIV-1 transactivation.","method":"Co-IP, ubiquitination assay, ELL2 stability assay, SEC assembly assay, HIV-1 transactivation assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — domain-specific inhibition characterized with multiple assays, single lab","pmids":["32479599"],"is_preprint":false},{"year":2020,"finding":"SIAH1 binds to and ubiquitinates MyD88, targeting it for proteasomal degradation; SIAH1 knockdown increases MyD88-dependent TLR7 signaling and reduces DENV2 replication. SIAH1 is induced during dengue infection via UPR activation.","method":"Co-IP, ubiquitination assay, CRISPR MyD88 knockout, siRNA knockdown, viral replication assay","journal":"Frontiers in microbiology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination, CRISPR genetic validation, single lab","pmids":["32117091"],"is_preprint":false},{"year":2011,"finding":"EHMT2 (G9a) suppresses SIAH1 transcription by binding to the SIAH1 promoter region (-293 to +51) and methylating histone H3 lysine 9 (H3K9), thus reducing SIAH1 expression in cancer cells.","method":"ChIP, promoter binding assay, siRNA knockdown, H3K9 methylation assay","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP with promoter mapping and epigenetic mechanism defined, single lab","pmids":["21847359"],"is_preprint":false},{"year":2009,"finding":"E2F1 directly binds to two putative E2F1-binding sites in the Siah1 promoter (as demonstrated by ChIP) and activates Siah1 transcription, thereby suppressing beta-catenin/TCF activity. Siah1 mediates E2F1's repression of Wnt/beta-catenin signaling.","method":"ChIP, luciferase reporter assay, E2F1 knockdown (shRNA), Siah1 shRNA epistasis","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP with functional reporter and epistasis experiment, single lab","pmids":["20187294"],"is_preprint":false},{"year":2007,"finding":"A novel splice variant of Siah-1, Siah-1S, acts as a dominant negative by forming heterodimers with Siah-1 that cannot bind SIP, thereby counteracting Siah-1-mediated beta-catenin downregulation and antagonizing Siah-1-potentiated apoptosis.","method":"Alternative splicing characterization, Co-IP, beta-catenin assay, apoptosis assay, soft agar assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — domain interaction established mechanistically, multiple functional readouts, single lab","pmids":["17420721"],"is_preprint":false},{"year":2011,"finding":"Eukaryotic translation elongation factor 1 delta (EEF1D) interacts with the Cys-rich domain of SIAH-1 and inhibits SIAH-1 auto-ubiquitination and degradation, as well as inhibiting SIAH-1-mediated degradation of substrate HPH2, thereby negatively regulating SIAH-1 ubiquitin ligase activity.","method":"Co-IP, in vitro and in vivo interaction assay, ubiquitination assay, substrate degradation assay","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus ubiquitination assay with domain mapping, single lab","pmids":["21633900"],"is_preprint":false},{"year":2019,"finding":"SIAH1 ubiquitin ligase preferentially interacts with Akt3 (not Akt1 or Akt2) and facilitates Akt3 ubiquitination and proteasomal degradation; the somatic brain mutation Akt3-E17K escapes Siah1-mediated degradation, causing abnormal neural development with dysmorphic neurons.","method":"Co-IP, ubiquitination assay, isoform selectivity analysis, Akt3-E17K mutant, neural morphology assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — isoform selectivity with disease mutant escape mechanism, functional neural phenotype, multiple methods","pmids":["31471318"],"is_preprint":false},{"year":2022,"finding":"SIAH1 interacts with and ubiquitinates YBX-1 at Lys304 via its RING finger domain in the cytoplasm, targeting it for proteasomal degradation; YBX-1 ubiquitination by SIAH1 leads to instability of YBX-1 target m5C-modified mRNAs, sensitizing ovarian cancer cells to cisplatin.","method":"Co-IP, ubiquitination assay with specific lysine mapping, m5C mRNA stability assay, drug sensitivity assay","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — ubiquitination site mapped, downstream mRNA consequence shown, single lab","pmids":["35273154"],"is_preprint":false},{"year":2022,"finding":"SIAH1 interacts with and ubiquitinates TRF2, promoting its degradation in the cytoplasm; ROS-induced SIAH1 upregulation reduces TRF2, leading to telomere abnormalities and granulosa cell senescence in premature ovarian failure.","method":"Co-IP, ubiquitination assay, SIAH1 knockdown, colocalization assay, telomere dysfunction assay","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination, functional senescence assay, single lab","pmids":["35261172"],"is_preprint":false},{"year":2022,"finding":"SIAH1 interacts with and ubiquitinates XIAP, targeting it for proteasomal degradation; METTL3-mediated m6A methylation of SIAH1 mRNA regulates SIAH1 expression, and SIAH1-mediated XIAP degradation promotes senescence and apoptosis in nucleus pulposus cells.","method":"Co-IP, ubiquitination assay, m6A RIP, actinomycin D RNA stability assay, SA-β-gal senescence assay","journal":"Tissue & cell","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination with m6A regulatory layer identified, single lab","pmids":["35580525"],"is_preprint":false},{"year":2022,"finding":"FRK tyrosine kinase phosphorylates YAP at Tyr391/407/444, which recruits SIAH1 to catalyze YAP ubiquitination and degradation; Siah1 is required for FRK-initiated YAP destabilization and tumor suppression in glioblastoma.","method":"Co-IP, ubiquitination assay, kinase assay, phospho-site mutagenesis, Siah1 knockdown epistasis, in vivo xenograft","journal":"Neuro-oncology","confidence":"High","confidence_rationale":"Tier 2 — phospho-site mutagenesis, Siah1 epistasis, in vivo validation, multiple orthogonal methods","pmids":["35723276"],"is_preprint":false},{"year":2014,"finding":"Siah1 promotes proteasome-dependent degradation of cytoplasmic p27 in glioma cells via its interaction facilitated by CacyBP/SIP scaffold; CacyBP/SIP overexpression promotes p27-Siah1 interaction and p27 ubiquitination, reducing glioma cell migration.","method":"Co-IP, ubiquitination assay, Siah1 knockdown, cell migration assay","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination, functional migration assay, single lab","pmids":["29024247"],"is_preprint":false}],"current_model":"SIAH1 is a RING-finger E3 ubiquitin ligase that functions as a central node in stress-response, apoptosis, and tumor suppression pathways: its N-terminal RING domain mediates ubiquitination and auto-ubiquitination, while its C-terminal substrate-binding domain (often acting as a dimer and scaffolded by SIP/CacyBP) recruits diverse substrates—including beta-catenin (via an APC/Ebi/SIP/Skp1 complex), GAPDH (whose S-nitrosylation triggers binding and nuclear translocation), HIPK2, ELL1/2, alpha-synuclein, synphilin-1, Numb, Akt3, and many others—for either proteasomal degradation or non-degradative ubiquitination; its activity and substrate access are regulated by ATM/ATR-mediated phosphorylation, competing binding partners (TBL1, HCF1/2, EEF1D), S-nitrosylation of binding partners (GAPDH, B23), and Aurora kinase phosphorylation of substrates, placing SIAH1 at the intersection of DNA damage signaling, the GAPDH-mediated apoptotic cascade, UPR-driven cell death, Wnt/beta-catenin regulation, and mitophagy."},"narrative":{"teleology":[{"year":1999,"claim":"Establishing SIAH1 as a RING-dependent E3 ubiquitin ligase with auto-ubiquitination capacity resolved the fundamental question of how this Drosophila Sina homolog controls substrate proteolysis in mammalian cells.","evidence":"Mutagenesis of RING domain and C-terminal substrate-binding domain, proteasome inhibitor assays, DCC degradation assay","pmids":["9858595"],"confidence":"High","gaps":["No E2 partner identified at this stage","Crystal structure of full-length SIAH1 not available","Mechanism of auto-ubiquitination versus substrate ubiquitination not distinguished"]},{"year":2001,"claim":"Discovery that SIAH1 assembles an SCF-like complex (with SIP, Skp1, Ebi, and APC) to degrade β-catenin independently of GSK3β phosphorylation established a p53-induced alternative route for Wnt pathway antagonism.","evidence":"Co-IP, protein interaction mapping, β-catenin degradation assays, p53 induction, Xenopus embryo dorsalization assay","pmids":["11389839","11389840"],"confidence":"High","gaps":["Relative contribution of Siah1 vs. GSK3β-dependent degradation in physiological contexts unclear","Whether APC and Ebi are simultaneously required in all tissues not resolved"]},{"year":2001,"claim":"Identification of Numb and OBF-1 as SIAH1 substrates demonstrated that SIAH1-mediated degradation extends to Notch signaling and B-cell transcription, broadening the ligase's functional scope beyond Wnt.","evidence":"Co-IP, degradation assays, Notch signaling reporter, octamer-dependent transcription reporter, proteasome inhibitor","pmids":["11752454","11483517"],"confidence":"High","gaps":["In vivo Notch phenotype in Siah1 knockout not shown","OBF-1 finding from single lab"]},{"year":2002,"claim":"Structural determination of the SIAH1 dimer revealed a large electronegative β-sheet concavity as the SIP-binding surface, providing the first structural framework for understanding substrate recruitment.","evidence":"X-ray crystallography, structure-guided mutagenesis abolishing SIP binding in vitro and in cells","pmids":["12421809"],"confidence":"High","gaps":["RING domain and zinc finger regions not resolved in this structure","How dimer interface contributes to substrate selectivity not defined"]},{"year":2003,"claim":"Demonstration that SIAH1 ubiquitinates synphilin-1 for proteasomal degradation—more efficiently than Parkin—and that the interaction occurs endogenously in brain tissue linked SIAH1 to Parkinson's disease-relevant protein quality control.","evidence":"Yeast two-hybrid, endogenous Co-IP in rat brain, ubiquitination assay, domain mapping, dopamine release assay","pmids":["14506261"],"confidence":"High","gaps":["Whether SIAH1 loss phenocopies Parkin loss in vivo not tested","Lewy body localization of SIAH1 not examined"]},{"year":2005,"claim":"The discovery that S-nitrosylation of GAPDH triggers GAPDH–Siah1 complex formation and nuclear translocation to initiate apoptosis established a novel nitric oxide–dependent cell death pathway mediated by SIAH1's NLS.","evidence":"Co-IP, S-nitrosylation assays, nuclear fractionation, NO deletion experiments in macrophages and neurons","pmids":["15951807"],"confidence":"High","gaps":["Nuclear substrates degraded by the GAPDH–Siah1 complex not identified","Whether this pathway operates in non-neuronal tissues in vivo unclear"]},{"year":2005,"claim":"Crystal structure of the SIP–Siah1 complex showed how SIP's PXAXVXP motif legs straddle the Siah1 dimer surface while projecting a Skp1-binding domain, explaining the SCF-like E3 assembly geometry.","evidence":"Crystal structure, site-directed mutagenesis, cell-based functional assay","pmids":["16085652"],"confidence":"High","gaps":["Full quaternary architecture including Skp1 and substrate not structurally resolved","How different substrates engage the same scaffold not determined"]},{"year":2007,"claim":"Showing that SIAH1 mono- and di-ubiquitinates α-synuclein in a non-degradative manner that promotes aggregation and toxicity—disrupted by the PD-linked A30P mutation—revealed a pathogenic ubiquitination mode distinct from proteasomal targeting.","evidence":"Co-IP, in vivo ubiquitination with E2 UbcH8 identification, PD mutant analysis, aggregation and viability assays","pmids":["18065497"],"confidence":"High","gaps":["Ubiquitin chain linkage type on α-synuclein not determined","Whether this modification occurs in patient brains not verified"]},{"year":2008,"claim":"Discovery that ATM/ATR phosphorylation of SIAH1 at Ser19 disrupts HIPK2 binding and stabilizes HIPK2 for apoptotic signaling revealed how the DNA damage response directly modulates SIAH1 substrate access.","evidence":"Co-IP, ubiquitination assay, kinase assay, phospho-site mutagenesis, Siah1 knockdown","pmids":["18536714"],"confidence":"High","gaps":["Whether Ser19 phosphorylation affects other SIAH1 substrates not tested","Structural basis of phosphorylation-induced complex disruption unknown"]},{"year":2009,"claim":"Identification of Aurora kinase-mediated EB3 phosphorylation as a signal to release EB3 from SIAH1 during mitosis demonstrated cell-cycle-dependent regulation of SIAH1 substrate targeting.","evidence":"Co-IP, ubiquitination assay, kinase assay, phospho-site mutagenesis (Ser176), SIAH1 knockdown","pmids":["19696028"],"confidence":"High","gaps":["Other mitotic substrates regulated similarly not surveyed","Mitotic phenotype of Siah1 depletion incompletely characterized"]},{"year":2010,"claim":"Reconstitution of SIAH1-mediated polyubiquitination of non-phosphorylated β-catenin with purified proteins, and discovery that TBL1 competitively protects β-catenin during Wnt signaling, clarified the molecular logic of Wnt-dependent substrate shielding.","evidence":"In vitro ubiquitination with purified components, Co-IP, proteasomal degradation assay in cells","pmids":["20181957"],"confidence":"High","gaps":["Whether TBL1 competition operates in all Wnt-responsive tissues not shown","Structural basis of TBL1–β-catenin competition with SIAH1 unknown"]},{"year":2011,"claim":"Identification of ELL1/ELL2 as SIAH1 substrates regulated by acetylation/deacetylation crosstalk (p300/HDAC3), with AFF4-bound ELL2 in the Super Elongation Complex being protected from SIAH1, linked SIAH1 to transcriptional elongation control and HIV-1 latency reversal.","evidence":"Co-IP, ubiquitination assay, acetylation assay, SEC assembly analysis, HIV-1 transcription assays","pmids":["32152128","22483617"],"confidence":"High","gaps":["Whether SIAH1 targets other SEC components not assessed","In vivo relevance for HIV latency reversal not tested in animal models"]},{"year":2012,"claim":"Discovery that nuclear B23/nucleophosmin is trans-S-nitrosylated by GAPDH, enhancing B23–SIAH1 binding and disrupting the GAPDH–SIAH1 complex to suppress SIAH1 ligase activity, revealed a negative feedback loop providing neuroprotection.","evidence":"Co-IP, S-nitrosylation assay, C275S mutagenesis, NMDA neurotoxicity model in vivo","pmids":["23027902"],"confidence":"High","gaps":["Whether other nuclear proteins undergo similar trans-nitrosylation-dependent regulation of SIAH1 unknown","Quantitative contribution of B23 pathway versus other SIAH1 regulators not determined"]},{"year":2014,"claim":"Demonstration that UPR transducers PERK/ATF4 and IRE1/sXBP1 induce SIAH1 transcription, and that SIAH1 stabilizes ATF4 by attenuating its proline hydroxylation, established a positive feedback loop amplifying ER stress-induced cell death, validated by reduced ischemic infarct in Siah-deficient mice.","evidence":"UPR pathway epistasis, siRNA knockdown, Siah1a+/−::Siah2−/− knockout mice, neuronal ischemia model","pmids":["24809345"],"confidence":"High","gaps":["Whether ATF4 is a direct SIAH1 ubiquitination substrate or indirectly stabilized not fully resolved","Contribution of Siah1 vs. Siah2 in the ischemic phenotype not separated"]},{"year":2016,"claim":"Discovery that synphilin-1 recruits SIAH1 to mitochondria in a PINK1-dependent manner to drive parkin-independent mitophagy established SIAH1 as an alternative mitophagy E3 ligase.","evidence":"Co-IP, LC3/Lamp1 recruitment, Atg5 knockdown epistasis, catalytically dead SIAH1 mutant, PINK1 disease mutant analysis","pmids":["27334109"],"confidence":"High","gaps":["Mitochondrial substrates ubiquitinated by SIAH1 during mitophagy not identified","Physiological significance relative to Parkin-dependent mitophagy not quantified"]},{"year":2019,"claim":"Demonstration of isoform-selective Akt3 ubiquitination by SIAH1—with the somatic E17K mutation escaping degradation and causing dysmorphic neurons—linked SIAH1 substrate selectivity to a specific neurodevelopmental pathology.","evidence":"Co-IP, ubiquitination assay, Akt isoform selectivity analysis, Akt3-E17K mutant, neural morphology assay","pmids":["31471318"],"confidence":"High","gaps":["Structural basis for Akt3 selectivity over Akt1/2 not determined","Whether other brain somatic mutations escape SIAH1 degradation not explored"]},{"year":2020,"claim":"Identification of HCF1/HCF2 as SIAH1 substrate-binding domain blockers that prevent both auto-ubiquitination and ELL2 degradation refined the model of competitive inhibition regulating SIAH1 ligase output.","evidence":"Co-IP, ubiquitination assay, ELL2 stability assay, SEC assembly, HIV-1 transactivation assay","pmids":["32479599"],"confidence":"Medium","gaps":["Whether HCF1/2 protect all SIAH1 substrates or only ELL2 not tested","Single-lab finding"]},{"year":2022,"claim":"Expansion of SIAH1 substrate repertoire to include YBX-1 (at mapped Lys304), TRF2, XIAP, and phospho-YAP connected SIAH1-mediated ubiquitination to RNA modification, telomere maintenance, anti-apoptotic signaling, and Hippo pathway tumor suppression.","evidence":"Co-IP, ubiquitination assays with specific lysine mapping, phospho-site mutagenesis (YAP), in vivo xenograft (glioblastoma), senescence assays","pmids":["35273154","35261172","35580525","35723276"],"confidence":"Medium","gaps":["Most findings from individual labs awaiting independent replication","Relative physiological importance of these substrates versus canonical SIAH1 targets not ranked","Tissue specificity of each substrate relationship not defined"]},{"year":null,"claim":"Key unresolved questions include the full structural basis for SIAH1's remarkably broad substrate selectivity, the relative contributions of Siah1 versus Siah2 in overlapping pathways, and whether SIAH1 plays non-catalytic scaffolding roles independent of its E3 ligase activity.","evidence":"","pmids":[],"confidence":"High","gaps":["No full-length SIAH1 structure with RING domain, zinc fingers, and substrate simultaneously resolved","Systematic substrate identification (e.g., ubiquitin remnant profiling in SIAH1-null cells) not performed","In vivo phenotype of Siah1-specific knockout (separated from Siah2) in adult tissues poorly characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3,4,6,7,8,13,22,40,41,44]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[3,4,6,8]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,26,29,30]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8,41,42]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,8,11,37,44]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,4,14,28,29]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,6,7,13,22,40,41]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[5]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[13,22]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[15,16]}],"complexes":["Siah1-SIP/CacyBP-Skp1-Ebi SCF-like complex","GAPDH-Siah1 nuclear translocation complex","PINK1-synphilin-1-SIAH1 mitophagy complex"],"partners":["CACYBP","GAPDH","SNCAIP","CTNNB1","HIPK2","ELL2","NPM1","APC"],"other_free_text":[]},"mechanistic_narrative":"SIAH1 is a RING-finger E3 ubiquitin ligase that functions as a central effector linking stress-response signaling to targeted protein degradation across diverse cellular pathways including Wnt/β-catenin regulation, apoptosis, mitophagy, and the DNA damage response. Its N-terminal RING domain catalyzes ubiquitination and auto-ubiquitination, while its C-terminal substrate-binding domain dimerizes and, often scaffolded by SIP/CacyBP and Skp1, recruits a broad substrate repertoire—including β-catenin, HIPK2, α-synuclein, synphilin-1, Numb, ELL1/2, Akt3, YAP, and others—for proteasomal degradation or non-degradative ubiquitination [PMID:9858595, PMID:11389839, PMID:16085652, PMID:18065497, PMID:31471318, PMID:35723276]. S-nitrosylation of GAPDH triggers formation of a GAPDH–Siah1 complex that translocates to the nucleus via Siah1's NLS, initiating an apoptotic cascade involving nuclear protein degradation, a pathway modulated by B23 trans-nitrosylation and ASK1 phosphorylation of Siah1 [PMID:15951807, PMID:23027902, PMID:25391652]. SIAH1 activity is regulated at multiple levels: ATM/ATR phosphorylation at Ser19 disrupts HIPK2 binding to permit apoptotic signaling after DNA damage, Aurora kinase phosphorylation of substrates like EB3 controls cell-cycle-dependent degradation, competing binding partners (TBL1, HCF1/2, EEF1D) block substrate access, and transcriptional control by p53, E2F1, UPR transducers (PERK/ATF4, IRE1/sXBP1), and epigenetic silencing by EHMT2 tunes Siah1 protein levels [PMID:18536714, PMID:19696028, PMID:20181957, PMID:32479599, PMID:24809345, PMID:20187294, PMID:21847359]."},"prefetch_data":{"uniprot":{"accession":"Q8IUQ4","full_name":"E3 ubiquitin-protein ligase SIAH1","aliases":["RING-type E3 ubiquitin transferase SIAH1","Seven in absentia homolog 1","Siah-1","Siah-1a"],"length_aa":282,"mass_kda":31.1,"function":"E3 ubiquitin-protein ligase that mediates ubiquitination and subsequent proteasomal degradation of target proteins (PubMed:14506261, PubMed:14645235, PubMed:14654780, PubMed:15064394, PubMed:16085652, PubMed:19224863, PubMed:20508617, PubMed:22483617, PubMed:28546513, PubMed:32430360, PubMed:33591310, PubMed:9334332, PubMed:9858595). E3 ubiquitin ligases accept ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates (PubMed:14506261, PubMed:14645235, PubMed:14654780, PubMed:15064394, PubMed:16085652, PubMed:19224863, PubMed:20508617, PubMed:22483617, PubMed:9334332, PubMed:9858595). Mediates E3 ubiquitin ligase activity either through direct binding to substrates or by functioning as the essential RING domain subunit of larger E3 complexes (PubMed:14506261, PubMed:14645235, PubMed:14654780, PubMed:15064394, PubMed:16085652, PubMed:19224863, PubMed:20508617, PubMed:22483617, PubMed:9334332, PubMed:9858595). Triggers the ubiquitin-mediated degradation of many substrates, including proteins involved in transcription regulation (ELL2, MYB, POU2AF1, PML and RBBP8), a cell surface receptor (DCC), the cell-surface receptor-type tyrosine kinase FLT3, the cytoplasmic signal transduction molecules (KLF10/TIEG1 and NUMB), an antiapoptotic protein (BAG1), a microtubule motor protein (KIF22), a protein involved in synaptic vesicle function in neurons (SYP), a structural protein (CTNNB1) and SNCAIP (PubMed:10747903, PubMed:11146551, PubMed:11389839, PubMed:11389840, PubMed:11483517, PubMed:11483518, PubMed:11752454, PubMed:12072443). Confers constitutive instability to HIPK2 through proteasomal degradation (PubMed:18536714, PubMed:33591310). It is thereby involved in many cellular processes such as apoptosis, tumor suppression, cell cycle, axon guidance, transcription regulation, spermatogenesis and TNF signaling (PubMed:14506261, PubMed:14645235, PubMed:14654780, PubMed:15064394, PubMed:16085652, PubMed:19224863, PubMed:20508617, PubMed:22483617, PubMed:9334332, PubMed:9858595). Has some overlapping function with SIAH2 (PubMed:14506261, PubMed:14645235, PubMed:14654780, PubMed:15064394, PubMed:16085652, PubMed:19224863, PubMed:20508617, PubMed:22483617, PubMed:9334332, PubMed:9858595). Induces apoptosis in cooperation with PEG3 (By similarity). Upon nitric oxid (NO) generation that follows apoptotic stimulation, interacts with S-nitrosylated GAPDH, mediating the translocation of GAPDH to the nucleus (By similarity). GAPDH acts as a stabilizer of SIAH1, facilitating the degradation of nuclear proteins (By similarity). Mediates ubiquitination and degradation of EGLN2 and EGLN3 in response to the unfolded protein response (UPR), leading to their degradation and subsequent stabilization of ATF4 (By similarity). Also part of the Wnt signaling pathway in which it mediates the Wnt-induced ubiquitin-mediated proteasomal degradation of AXIN1 (PubMed:28546513, PubMed:32430360)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q8IUQ4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SIAH1","classification":"Not Classified","n_dependent_lines":28,"n_total_lines":1208,"dependency_fraction":0.023178807947019868},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SIAH1","total_profiled":1310},"omim":[{"mim_id":"619314","title":"BURATTI-HAREL SYNDROME; BURHAS","url":"https://www.omim.org/entry/619314"},{"mim_id":"616368","title":"CHOPS SYNDROME; CHOPS","url":"https://www.omim.org/entry/616368"},{"mim_id":"611223","title":"AKT SERINE/THREONINE KINASE 3; AKT3","url":"https://www.omim.org/entry/611223"},{"mim_id":"610421","title":"KH DOMAIN-CONTAINING, RNA-BINDING, SIGNAL TRANSDUCTION-ASSOCIATED PROTEIN 3; KHDRBS3","url":"https://www.omim.org/entry/610421"},{"mim_id":"609206","title":"EUKARYOTIC TRANSLATION ELONGATION FACTOR 1, EPSILON-1; EEF1E1","url":"https://www.omim.org/entry/609206"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Mitochondria","reliability":"Uncertain"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SIAH1"},"hgnc":{"alias_symbol":["hSIAH1"],"prev_symbol":[]},"alphafold":{"accession":"Q8IUQ4","domains":[{"cath_id":"3.30.40.10","chopping":"32-115","consensus_level":"high","plddt":94.4583,"start":32,"end":115},{"cath_id":"2.60.210.10","chopping":"153-280","consensus_level":"high","plddt":95.3303,"start":153,"end":280}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IUQ4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IUQ4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IUQ4-F1-predicted_aligned_error_v6.png","plddt_mean":89.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SIAH1","jax_strain_url":"https://www.jax.org/strain/search?query=SIAH1"},"sequence":{"accession":"Q8IUQ4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IUQ4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IUQ4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IUQ4"}},"corpus_meta":[{"pmid":"15951807","id":"PMC_15951807","title":"S-nitrosylated GAPDH initiates apoptotic cell death by nuclear translocation following Siah1 binding.","date":"2005","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15951807","citation_count":884,"is_preprint":false},{"pmid":"11389839","id":"PMC_11389839","title":"Siah-1, SIP, and Ebi collaborate in a novel pathway for beta-catenin degradation linked to p53 responses.","date":"2001","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/11389839","citation_count":521,"is_preprint":false},{"pmid":"11389840","id":"PMC_11389840","title":"Siah-1 mediates a novel beta-catenin degradation pathway linking p53 to the adenomatous polyposis coli protein.","date":"2001","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/11389840","citation_count":367,"is_preprint":false},{"pmid":"12399545","id":"PMC_12399545","title":"Biological models and genes of tumor reversion: cellular reprogramming through tpt1/TCTP and SIAH-1.","date":"2002","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/12399545","citation_count":226,"is_preprint":false},{"pmid":"9858595","id":"PMC_9858595","title":"Siah-1 N-terminal RING domain is required for proteolysis function, and C-terminal sequences regulate oligomerization and binding to target proteins.","date":"1999","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/9858595","citation_count":215,"is_preprint":false},{"pmid":"18536714","id":"PMC_18536714","title":"Control of HIPK2 stability by ubiquitin ligase Siah-1 and checkpoint kinases ATM and ATR.","date":"2008","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/18536714","citation_count":166,"is_preprint":false},{"pmid":"27334109","id":"PMC_27334109","title":"The PINK1, synphilin-1 and SIAH-1 complex constitutes a novel mitophagy pathway.","date":"2016","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/27334109","citation_count":144,"is_preprint":false},{"pmid":"18065497","id":"PMC_18065497","title":"Ubiquitination of alpha-synuclein by Siah-1 promotes alpha-synuclein aggregation and apoptotic cell death.","date":"2007","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/18065497","citation_count":144,"is_preprint":false},{"pmid":"12810624","id":"PMC_12810624","title":"Involvement of PEG10 in human hepatocellular carcinogenesis through interaction with SIAH1.","date":"2003","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/12810624","citation_count":143,"is_preprint":false},{"pmid":"17047048","id":"PMC_17047048","title":"EBV latent membrane protein 1 up-regulates hypoxia-inducible factor 1alpha through Siah1-mediated down-regulation of prolyl hydroxylases 1 and 3 in nasopharyngeal epithelial cells.","date":"2006","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/17047048","citation_count":118,"is_preprint":false},{"pmid":"10393949","id":"PMC_10393949","title":"SIAH-1 promotes apoptosis and tumor suppression through a network involving the regulation of protein folding, unfolding, and trafficking: identification of common effectors with p53 and p21(Waf1).","date":"1999","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/10393949","citation_count":104,"is_preprint":false},{"pmid":"21847359","id":"PMC_21847359","title":"Enhanced expression of EHMT2 is involved in the proliferation of cancer cells through negative regulation of SIAH1.","date":"2011","source":"Neoplasia (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/21847359","citation_count":101,"is_preprint":false},{"pmid":"14506261","id":"PMC_14506261","title":"Siah-1 facilitates ubiquitination and degradation of synphilin-1.","date":"2003","source":"The 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chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16085652","citation_count":86,"is_preprint":false},{"pmid":"11752454","id":"PMC_11752454","title":"Siah-1 binds and regulates the function of Numb.","date":"2001","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/11752454","citation_count":82,"is_preprint":false},{"pmid":"11146551","id":"PMC_11146551","title":"SIAH-1 interacts with alpha-tubulin and degrades the kinesin Kid by the proteasome pathway during mitosis.","date":"2000","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/11146551","citation_count":75,"is_preprint":false},{"pmid":"11483517","id":"PMC_11483517","title":"The RING finger protein Siah-1 regulates the level of the transcriptional coactivator OBF-1.","date":"2001","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/11483517","citation_count":69,"is_preprint":false},{"pmid":"22483617","id":"PMC_22483617","title":"The ubiquitin ligase Siah1 controls ELL2 stability and formation of super elongation complexes to modulate gene transcription.","date":"2012","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/22483617","citation_count":57,"is_preprint":false},{"pmid":"16230351","id":"PMC_16230351","title":"Siah1 interacts with the scaffold protein POSH to promote JNK activation and apoptosis.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16230351","citation_count":56,"is_preprint":false},{"pmid":"18803400","id":"PMC_18803400","title":"Structure of the S100A6 complex with a fragment from the C-terminal domain of Siah-1 interacting protein: a novel mode for S100 protein target recognition.","date":"2008","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/18803400","citation_count":55,"is_preprint":false},{"pmid":"24503442","id":"PMC_24503442","title":"miR-135a leads to cervical cancer cell transformation through regulation of β-catenin via a SIAH1-dependent ubiquitin proteosomal pathway.","date":"2014","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/24503442","citation_count":52,"is_preprint":false},{"pmid":"19940145","id":"PMC_19940145","title":"siah-1 Protein is necessary for high glucose-induced glyceraldehyde-3-phosphate dehydrogenase nuclear accumulation and cell death in Muller cells.","date":"2009","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19940145","citation_count":48,"is_preprint":false},{"pmid":"19696028","id":"PMC_19696028","title":"Mitotic regulation of the stability of microtubule plus-end tracking protein EB3 by ubiquitin ligase SIAH-1 and Aurora mitotic kinases.","date":"2009","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19696028","citation_count":48,"is_preprint":false},{"pmid":"17273732","id":"PMC_17273732","title":"SIAH1 causes growth arrest and apoptosis in hepatoma cells through beta-catenin degradation-dependent and -independent mechanisms.","date":"2007","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/17273732","citation_count":45,"is_preprint":false},{"pmid":"35273154","id":"PMC_35273154","title":"SIAH1 reverses chemoresistance in epithelial ovarian cancer via ubiquitination of YBX-1.","date":"2022","source":"Oncogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/35273154","citation_count":45,"is_preprint":false},{"pmid":"21878328","id":"PMC_21878328","title":"E3 ubiquitin ligase Siah-1 facilitates poly-ubiquitylation and proteasomal degradation of the hepatitis B viral X protein.","date":"2011","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/21878328","citation_count":44,"is_preprint":false},{"pmid":"15163637","id":"PMC_15163637","title":"SIAH1 targets the alternative splicing factor T-STAR for degradation by the proteasome.","date":"2004","source":"Human molecular 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Siah1's nuclear localization signal mediates nuclear translocation of the GAPDH-Siah1 complex, where Siah1 stabilizes GAPDH and facilitates degradation of nuclear proteins, initiating apoptotic cell death.\",\n      \"method\": \"Co-IP, S-nitrosylation assay, nuclear fractionation, NO deletion experiments in macrophages and neurons\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with functional consequence, replicated in multiple cell types with NO deletion controls\",\n      \"pmids\": [\"15951807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Siah-1 forms a multiprotein SCF-like E3 ligase complex with SIP (a Sgt1 homolog that binds Skp1) and the F-box protein Ebi to degrade beta-catenin independently of GSK3beta-mediated phosphorylation; Siah-1 expression is induced by p53, linking genotoxic stress to beta-catenin destruction.\",\n      \"method\": \"Co-IP, protein interaction mapping, beta-catenin degradation assay, p53 induction assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, functional degradation assay, independently replicated in same issue\",\n      \"pmids\": [\"11389839\", \"11389840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Siah-1 interacts with the C-terminus of APC and promotes phosphorylation-independent, beta-TrCP-independent degradation of beta-catenin; demonstrated functionally by hypodorsalization of Xenopus embryos.\",\n      \"method\": \"Co-IP, beta-catenin degradation assay, Xenopus embryo functional assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus in vivo functional validation in Xenopus, replicated alongside companion paper\",\n      \"pmids\": [\"11389840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Siah-1 N-terminal RING finger domain is required for proteolysis of target proteins (e.g., DCC); C-terminal domain mediates oligomerization with itself and other Sina/Siah proteins and binding to substrates. RING domain mutations stabilize Siah-1 itself, indicating auto-ubiquitination. A dominant-negative C-terminal mutant stabilizes DCC endogenously.\",\n      \"method\": \"Mutagenesis, proteasome inhibitor assays, DCC degradation assay, antisense approach\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — active-site mutagenesis with defined substrate degradation assay and multiple orthogonal methods\",\n      \"pmids\": [\"9858595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Siah-1 directly interacts with and polyubiquitinates HIPK2, targeting it for proteasomal degradation in unstressed cells. DNA damage triggers ATM/ATR-dependent phosphorylation of Siah-1 at Ser19, disrupting the HIPK2-Siah-1 complex and stabilizing HIPK2 for apoptotic signaling.\",\n      \"method\": \"Co-IP, ubiquitination assay, Siah-1 knockdown, kinase assay, phospho-site mutagenesis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including phospho-site mutagenesis and functional rescue experiments\",\n      \"pmids\": [\"18536714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PINK1, synphilin-1, and SIAH-1 form a complex constituting a parkin-independent mitophagy pathway: synphilin-1 recruits SIAH-1 to mitochondria where it promotes mitochondrial protein ubiquitination and mitophagy; catalytically inactive SIAH-1 mutant abrogates this pathway.\",\n      \"method\": \"Co-IP, LC3/Lamp1 recruitment assay, Atg5 knockdown, catalytic-dead mutant, PINK1 disease mutant analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, genetic epistasis with PINK1 disease mutants and catalytic-dead SIAH1\",\n      \"pmids\": [\"27334109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Siah-1 binds alpha-synuclein, recruits E2 enzyme UbcH8, and catalyzes mono- and di-ubiquitination of alpha-synuclein in vivo; this ubiquitination does not target alpha-synuclein for proteasomal degradation but promotes its aggregation and cytotoxicity. The PD-linked A30P mutation disrupts Siah-1-mediated ubiquitination.\",\n      \"method\": \"Co-IP, in vivo ubiquitination assay, PD mutant analysis, aggregation assay, cell viability assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo ubiquitination with E2 identification, PD mutant mechanistic analysis, multiple readouts\",\n      \"pmids\": [\"18065497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Siah-1 interacts with synphilin-1 via its substrate-binding domain (C-terminus of Siah-1 binds N-terminus of synphilin-1) and ubiquitinates synphilin-1 via its RING finger domain, promoting synphilin-1 degradation via the ubiquitin-proteasome pathway more efficiently than Parkin; Siah-1 abrogates synphilin-1's inhibitory effect on dopamine release.\",\n      \"method\": \"Yeast two-hybrid, Co-IP in rat brain, ubiquitination assay, domain mapping, dopamine release assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — endogenous Co-IP in brain tissue, domain mapping, functional consequence measured\",\n      \"pmids\": [\"14506261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Siah-1 alone can directly polyubiquitinate non-phosphorylated beta-catenin in vitro; TBL1 competes with Siah-1 for the same armadillo repeat domain of beta-catenin, protecting it from Siah-1-mediated ubiquitination and proteasomal degradation during Wnt signaling.\",\n      \"method\": \"In vitro ubiquitination assay with purified proteins, Co-IP, proteasomal degradation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro ubiquitination with purified components, confirmed in cells\",\n      \"pmids\": [\"20181957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SIP engages Siah1 via two elements: an N-terminal dimerization domain that sits across the saddle-shaped upper surface of Siah1 with PXAXVXP motif legs, and a C-terminal Skp1-binding domain that protrudes from the lower surface of Siah1, forming the scaffold for bringing substrate and E2 into apposition.\",\n      \"method\": \"Crystal structure, site-directed mutagenesis, functional cell-based assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mutagenesis validation and functional assay\",\n      \"pmids\": [\"16085652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Structural analysis of Siah1 dimer reveals a large electronegative beta-sheet concavity across the dimer interface that mediates interaction with SIP; site-directed mutagenesis of these electronegative residues abolishes Siah1-SIP binding in vitro and in cells.\",\n      \"method\": \"Structure-based approach, site-directed mutagenesis, in vitro and cell binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure-guided mutagenesis with functional validation\",\n      \"pmids\": [\"12421809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Siah-1 directly interacts with and promotes proteasomal degradation of the cell fate regulator Numb; Siah-1-mediated Numb degradation causes redistribution of Notch from cell surface to cytoplasm/nucleus and augments Notch-regulated transcriptional activity.\",\n      \"method\": \"Co-IP, pulldown, degradation assay, Notch signaling reporter assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction plus functional pathway consequence demonstrated\",\n      \"pmids\": [\"11752454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Siah-1 interacts with the transcriptional coactivator OBF-1 via its C-terminal domain; this interaction leads to proteasomal degradation of OBF-1 protein and reduction in octamer site-dependent transcription. Inhibition of ubiquitin-proteasome pathway elevates OBF-1 protein in B cells.\",\n      \"method\": \"Co-IP, domain mapping, OBF-1 degradation assay, transcription reporter assay, proteasome inhibitor\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with domain mapping, functional transcription assay, proteasome inhibitor validation\",\n      \"pmids\": [\"11483517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Siah1 is the E3 ubiquitin ligase for ELL2 polyubiquitination and proteasomal degradation; Siah1 cannot access ELL2 bound to AFF4 within the Super Elongation Complex (SEC). Prostratin and HMBA activate HIV transcription by decreasing Siah1 expression and ELL2 polyubiquitination.\",\n      \"method\": \"Co-IP, in vivo ubiquitination assay, SEC assembly assay, Siah1 knockdown/overexpression\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, structure-function relationship with AFF4-bound ELL2 defined\",\n      \"pmids\": [\"22483617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Siah1 is a binding partner of POSH scaffold protein; Siah1 contributes to apoptosis by activating the JNK pathway in a manner requiring its E3 ligase activity. Apoptotic stimuli stabilize Siah1 protein via JNK pathway activation and POSH interaction; SIAH1 stabilization is enhanced by phosphorylation at Tyr100 and Tyr126.\",\n      \"method\": \"Co-IP, JNK pathway assays, siRNA knockdown, phospho-site analysis, cell death assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, E3-dead mutant, siRNA depletion, phospho-site mutagenesis with functional consequence\",\n      \"pmids\": [\"16230351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SIAH-1 interacts with alpha-tubulin and degrades the chromokinesin Kid via the ubiquitin-proteasome pathway during mitosis; N-terminal RING domain is required for Kid degradation. SIAH-1 overexpression causes mitotic alterations including multinucleated giant cells.\",\n      \"method\": \"Yeast two-hybrid, ubiquitin-proteasome degradation assay, N-terminal deletion mutant, confocal microscopy\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid plus functional degradation assay, single lab\",\n      \"pmids\": [\"11146551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SIAH-1 facilitates EB3 polyubiquitination and proteasomal degradation; Aurora-A and Aurora-B phosphorylate EB3 at Ser-176 during mitosis, triggering disruption of the EB3-SIAH-1 complex and EB3 stabilization during mitosis with subsequent degradation at G1.\",\n      \"method\": \"Co-IP, ubiquitination assay, SIAH-1 knockdown, kinase assay, phospho-site mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including kinase assay and phospho-site mutagenesis with functional consequence\",\n      \"pmids\": [\"19696028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Siah-1 interacts with and ubiquitinates FIH (factor inhibiting HIF-1alpha) via its RING finger domain, binding the JmjC domain of FIH through its substrate-binding domain, and promotes FIH degradation via the ubiquitin-proteasome pathway, thereby regulating HIF-1alpha transcriptional activity.\",\n      \"method\": \"Co-IP, ubiquitination assay, domain mapping, Siah-1 siRNA knockdown, proteasome inhibitor\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination assay, knockdown, single lab\",\n      \"pmids\": [\"17188242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"EBV LMP1 up-regulates Siah1 E3 ubiquitin ligase by enhancing its stability; elevated Siah1 then promotes proteasomal degradation of prolyl hydroxylases PHD1 and PHD3, preventing VHL/HIF-1alpha complex formation and stabilizing HIF-1alpha to drive angiogenesis.\",\n      \"method\": \"Co-IP, proteasomal degradation assay, Siah1 knockdown/overexpression, VHL co-IP\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional pathway demonstration, single lab\",\n      \"pmids\": [\"17047048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"SIAH1 interacts with and promotes ubiquitin-proteasome-mediated degradation of CtIP (CtBP-interacting protein); SIAH-1 interaction with CtIP leads to p21(Waf1) induction, but this induction does not require CtIP degradation (a RING-deleted mutant also induces p21).\",\n      \"method\": \"Yeast two-hybrid, Co-IP, ubiquitination/degradation assay, RING deletion mutant, luciferase reporter\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination assay, domain mutant analysis, single lab\",\n      \"pmids\": [\"14654780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SIAH1 binds an octapeptide sequence in T-STAR and targets it for proteasome-dependent degradation; rodent T-STAR orthologs are not degraded unless humanized at the SIAH1-binding site. SIAH1-mediated T-STAR degradation modulates alternative splicing activity.\",\n      \"method\": \"Yeast two-hybrid, domain/peptide mapping, degradation assay, alternative splicing minigene assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain mapping, species-swap mutagenesis, functional splicing assay with orthogonal methods\",\n      \"pmids\": [\"15163637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SIAH1 interacts with and ubiquitinates TRB3 (Tribbles 3 homolog), targeting it for proteasome-dependent degradation; SIAH1-induced degradation of TRB3 counteracts TRB3-mediated upregulation of TGF-beta signaling.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, ubiquitination assay, TGF-beta signaling reporter\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and in vitro/in vivo ubiquitination, single lab\",\n      \"pmids\": [\"18276110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Siah-1 polyubiquitinates and promotes proteasomal degradation of ELL (ELL1), regulated by site-specific acetylation (p300-mediated) and deacetylation (HDAC3-mediated) of ELL; acetylated ELL is more stable because deacetylation by HDAC3 enables Siah1-mediated polyubiquitination. DBC1 competes with HDAC3 for ELL binding, stabilizing ELL.\",\n      \"method\": \"Co-IP, ubiquitination assay, acetylation assay, siRNA knockdown, domain competition assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing acetylation-ubiquitination crosstalk for ELL stability via Siah1\",\n      \"pmids\": [\"32152128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Siah-1 polyubiquitinates PML-RARα for proteasomal degradation together with E2 enzyme UBCH8; this is distinct from TRIAD1, which binds but does not degrade PML-RARα.\",\n      \"method\": \"Co-IP, ubiquitination assay, comparison with TRIAD1\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ubiquitination assay with E2 partner identified, single lab\",\n      \"pmids\": [\"22037423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SIAH-1 interacts with and promotes proteasomal degradation of HBx (hepatitis B viral X protein) via polyubiquitylation, thereby attenuating HBx-dependent transactivation of GRE, HSE, and CRE signal pathways; SIAH-1 participates in p53-mediated HBx degradation.\",\n      \"method\": \"Co-IP, ubiquitination assay, transcriptional reporter assay, p53 pathway analysis\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination, functional transcription assay, single lab\",\n      \"pmids\": [\"21878328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Siah-1 interacts with the intracellular C-terminal domain of polycystin-1 and promotes its ubiquitination and proteasomal degradation, shortening its half-life.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, ubiquitination assay, half-life assay\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus ubiquitination and half-life assay, single lab\",\n      \"pmids\": [\"15284290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SIAH-1 interacts with and promotes ubiquitylation and proteasomal degradation of HSV ICP0; the virus-host interaction stabilizes SIAH-1 and recruits it into ICP0-containing nuclear bodies. Knockdown of SIAH-1 increases ICP0 levels and stability.\",\n      \"method\": \"Co-IP, in vitro and in vivo ubiquitination assay, SIAH-1 knockdown, nuclear body imaging\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, in vitro ubiquitination, knockdown with functional consequence, single lab\",\n      \"pmids\": [\"21632771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Siah1, interacting with Siah-interacting protein (SIP/CacyBP), promotes proteasome-dependent degradation of cytoplasmic p27 under glucose starvation, thereby regulating cell motility. SIP-/- fibroblasts have increased cytoplasmic p27 and enhanced cell motility.\",\n      \"method\": \"Ubiquitination assay, SIP-/- MEFs, glucose starvation, cell motility assay\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout cells with functional motility readout, single lab\",\n      \"pmids\": [\"21734459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"High levels of ER stress induce Siah1/2 transcription via PERK/ATF4 and IRE1/sXBP1 UPR transducers; Siah1/2 in turn attenuates proline hydroxylation of ATF4, stabilizing it and augmenting ER stress-induced cell death. Siah1a+/-::Siah2-/- mice show reduced infarct volume after neuronal ischemia.\",\n      \"method\": \"UPR pathway analysis, siRNA knockdown, Siah1a/2 knockout mice, ischemia model\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods including in vivo mouse ischemia model, genetic knockouts, pathway epistasis\",\n      \"pmids\": [\"24809345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"siah-1 is required for high glucose-induced GAPDH nuclear accumulation and cell death in Müller cells; under hyperglycemic conditions, siah-1 forms a complex with GAPDH and localizes predominantly in the nucleus. Siah-1 knockdown prevents GAPDH nuclear accumulation and inhibits p53 phosphorylation and cell death.\",\n      \"method\": \"siRNA knockdown, Co-IP, nuclear fractionation, apoptosis assay, p53 phosphorylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown with multiple functional readouts, mechanistic link to p53 established\",\n      \"pmids\": [\"19940145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"B23/nucleophosmin binds both SIAH1 and GAPDH in the nucleus; S-nitrosylation of B23 at Cys275 (by trans-nitrosylation from GAPDH) enhances B23-SIAH1 binding, disrupts SIAH1-GAPDH complex, and abrogates SIAH1 E3 ligase activity, providing neuroprotection.\",\n      \"method\": \"Co-IP, S-nitrosylation assay, site-directed mutagenesis (C275S), in vivo NMDA neurotoxicity model\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical reconstitution of trans-nitrosylation, mutagenesis, in vivo rescue\",\n      \"pmids\": [\"23027902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ASK1 (apoptosis signal-regulating kinase 1) interacts with both GAPDH and Siah1; ASK1 phosphorylates Siah1 at Thr70/Thr74 and Thr235/Thr239, triggering GAPDH-Siah1 stress signaling and activating nuclear p300 acetyltransferase.\",\n      \"method\": \"Co-IP, in vitro kinase assay, phospho-site mutagenesis, p300 activation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — kinase assay with phospho-site mapping, single lab\",\n      \"pmids\": [\"25391652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"S100A6 interacts with the SIP C-terminal domain (residues 189-219) in a bimodal fashion determined by NMR structure; the first helix binds S100A6 canonically while the second helix contacts the S100A6 dimer interface in a novel mode. S100A6-SIP interaction modulates SCF-TBL1 E3 ligase activity.\",\n      \"method\": \"NMR structure, isothermal titration calorimetry, structure-based mutagenesis, cell-based functional assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure with mutagenesis and functional validation\",\n      \"pmids\": [\"18803400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PARP1 suppresses Siah1 expression at both mRNA level (coordinating with co-repressor NCoR) and protein level (promoting PARylation-dependent ubiquitination/proteolysis of Siah1), thereby increasing ELL2 levels and promoting HIV-1 transcription via ELL2-SEC.\",\n      \"method\": \"Siah1 mRNA/protein level assays, NCoR Co-IP, PARylation assay, HIV-1 transcription assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple mechanisms tested, but PARdU of Siah1 described as 'likely', single lab\",\n      \"pmids\": [\"29949759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Host cell factors HCF1 and HCF2 bind and block the substrate-binding domain (SBD) of Siah1/2 to prevent auto-ubiquitination and trans-ubiquitination of ELL2, stabilizing ELL2 and enhancing ELL2-SEC formation for HIV-1 transactivation.\",\n      \"method\": \"Co-IP, ubiquitination assay, ELL2 stability assay, SEC assembly assay, HIV-1 transactivation assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain-specific inhibition characterized with multiple assays, single lab\",\n      \"pmids\": [\"32479599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SIAH1 binds to and ubiquitinates MyD88, targeting it for proteasomal degradation; SIAH1 knockdown increases MyD88-dependent TLR7 signaling and reduces DENV2 replication. SIAH1 is induced during dengue infection via UPR activation.\",\n      \"method\": \"Co-IP, ubiquitination assay, CRISPR MyD88 knockout, siRNA knockdown, viral replication assay\",\n      \"journal\": \"Frontiers in microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination, CRISPR genetic validation, single lab\",\n      \"pmids\": [\"32117091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"EHMT2 (G9a) suppresses SIAH1 transcription by binding to the SIAH1 promoter region (-293 to +51) and methylating histone H3 lysine 9 (H3K9), thus reducing SIAH1 expression in cancer cells.\",\n      \"method\": \"ChIP, promoter binding assay, siRNA knockdown, H3K9 methylation assay\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP with promoter mapping and epigenetic mechanism defined, single lab\",\n      \"pmids\": [\"21847359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"E2F1 directly binds to two putative E2F1-binding sites in the Siah1 promoter (as demonstrated by ChIP) and activates Siah1 transcription, thereby suppressing beta-catenin/TCF activity. Siah1 mediates E2F1's repression of Wnt/beta-catenin signaling.\",\n      \"method\": \"ChIP, luciferase reporter assay, E2F1 knockdown (shRNA), Siah1 shRNA epistasis\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP with functional reporter and epistasis experiment, single lab\",\n      \"pmids\": [\"20187294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"A novel splice variant of Siah-1, Siah-1S, acts as a dominant negative by forming heterodimers with Siah-1 that cannot bind SIP, thereby counteracting Siah-1-mediated beta-catenin downregulation and antagonizing Siah-1-potentiated apoptosis.\",\n      \"method\": \"Alternative splicing characterization, Co-IP, beta-catenin assay, apoptosis assay, soft agar assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain interaction established mechanistically, multiple functional readouts, single lab\",\n      \"pmids\": [\"17420721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Eukaryotic translation elongation factor 1 delta (EEF1D) interacts with the Cys-rich domain of SIAH-1 and inhibits SIAH-1 auto-ubiquitination and degradation, as well as inhibiting SIAH-1-mediated degradation of substrate HPH2, thereby negatively regulating SIAH-1 ubiquitin ligase activity.\",\n      \"method\": \"Co-IP, in vitro and in vivo interaction assay, ubiquitination assay, substrate degradation assay\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus ubiquitination assay with domain mapping, single lab\",\n      \"pmids\": [\"21633900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SIAH1 ubiquitin ligase preferentially interacts with Akt3 (not Akt1 or Akt2) and facilitates Akt3 ubiquitination and proteasomal degradation; the somatic brain mutation Akt3-E17K escapes Siah1-mediated degradation, causing abnormal neural development with dysmorphic neurons.\",\n      \"method\": \"Co-IP, ubiquitination assay, isoform selectivity analysis, Akt3-E17K mutant, neural morphology assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform selectivity with disease mutant escape mechanism, functional neural phenotype, multiple methods\",\n      \"pmids\": [\"31471318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SIAH1 interacts with and ubiquitinates YBX-1 at Lys304 via its RING finger domain in the cytoplasm, targeting it for proteasomal degradation; YBX-1 ubiquitination by SIAH1 leads to instability of YBX-1 target m5C-modified mRNAs, sensitizing ovarian cancer cells to cisplatin.\",\n      \"method\": \"Co-IP, ubiquitination assay with specific lysine mapping, m5C mRNA stability assay, drug sensitivity assay\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ubiquitination site mapped, downstream mRNA consequence shown, single lab\",\n      \"pmids\": [\"35273154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SIAH1 interacts with and ubiquitinates TRF2, promoting its degradation in the cytoplasm; ROS-induced SIAH1 upregulation reduces TRF2, leading to telomere abnormalities and granulosa cell senescence in premature ovarian failure.\",\n      \"method\": \"Co-IP, ubiquitination assay, SIAH1 knockdown, colocalization assay, telomere dysfunction assay\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination, functional senescence assay, single lab\",\n      \"pmids\": [\"35261172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SIAH1 interacts with and ubiquitinates XIAP, targeting it for proteasomal degradation; METTL3-mediated m6A methylation of SIAH1 mRNA regulates SIAH1 expression, and SIAH1-mediated XIAP degradation promotes senescence and apoptosis in nucleus pulposus cells.\",\n      \"method\": \"Co-IP, ubiquitination assay, m6A RIP, actinomycin D RNA stability assay, SA-β-gal senescence assay\",\n      \"journal\": \"Tissue & cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination with m6A regulatory layer identified, single lab\",\n      \"pmids\": [\"35580525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FRK tyrosine kinase phosphorylates YAP at Tyr391/407/444, which recruits SIAH1 to catalyze YAP ubiquitination and degradation; Siah1 is required for FRK-initiated YAP destabilization and tumor suppression in glioblastoma.\",\n      \"method\": \"Co-IP, ubiquitination assay, kinase assay, phospho-site mutagenesis, Siah1 knockdown epistasis, in vivo xenograft\",\n      \"journal\": \"Neuro-oncology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — phospho-site mutagenesis, Siah1 epistasis, in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"35723276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Siah1 promotes proteasome-dependent degradation of cytoplasmic p27 in glioma cells via its interaction facilitated by CacyBP/SIP scaffold; CacyBP/SIP overexpression promotes p27-Siah1 interaction and p27 ubiquitination, reducing glioma cell migration.\",\n      \"method\": \"Co-IP, ubiquitination assay, Siah1 knockdown, cell migration assay\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination, functional migration assay, single lab\",\n      \"pmids\": [\"29024247\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SIAH1 is a RING-finger E3 ubiquitin ligase that functions as a central node in stress-response, apoptosis, and tumor suppression pathways: its N-terminal RING domain mediates ubiquitination and auto-ubiquitination, while its C-terminal substrate-binding domain (often acting as a dimer and scaffolded by SIP/CacyBP) recruits diverse substrates—including beta-catenin (via an APC/Ebi/SIP/Skp1 complex), GAPDH (whose S-nitrosylation triggers binding and nuclear translocation), HIPK2, ELL1/2, alpha-synuclein, synphilin-1, Numb, Akt3, and many others—for either proteasomal degradation or non-degradative ubiquitination; its activity and substrate access are regulated by ATM/ATR-mediated phosphorylation, competing binding partners (TBL1, HCF1/2, EEF1D), S-nitrosylation of binding partners (GAPDH, B23), and Aurora kinase phosphorylation of substrates, placing SIAH1 at the intersection of DNA damage signaling, the GAPDH-mediated apoptotic cascade, UPR-driven cell death, Wnt/beta-catenin regulation, and mitophagy.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SIAH1 is a RING-finger E3 ubiquitin ligase that functions as a central effector linking stress-response signaling to targeted protein degradation across diverse cellular pathways including Wnt/β-catenin regulation, apoptosis, mitophagy, and the DNA damage response. Its N-terminal RING domain catalyzes ubiquitination and auto-ubiquitination, while its C-terminal substrate-binding domain dimerizes and, often scaffolded by SIP/CacyBP and Skp1, recruits a broad substrate repertoire—including β-catenin, HIPK2, α-synuclein, synphilin-1, Numb, ELL1/2, Akt3, YAP, and others—for proteasomal degradation or non-degradative ubiquitination [PMID:9858595, PMID:11389839, PMID:16085652, PMID:18065497, PMID:31471318, PMID:35723276]. S-nitrosylation of GAPDH triggers formation of a GAPDH–Siah1 complex that translocates to the nucleus via Siah1's NLS, initiating an apoptotic cascade involving nuclear protein degradation, a pathway modulated by B23 trans-nitrosylation and ASK1 phosphorylation of Siah1 [PMID:15951807, PMID:23027902, PMID:25391652]. SIAH1 activity is regulated at multiple levels: ATM/ATR phosphorylation at Ser19 disrupts HIPK2 binding to permit apoptotic signaling after DNA damage, Aurora kinase phosphorylation of substrates like EB3 controls cell-cycle-dependent degradation, competing binding partners (TBL1, HCF1/2, EEF1D) block substrate access, and transcriptional control by p53, E2F1, UPR transducers (PERK/ATF4, IRE1/sXBP1), and epigenetic silencing by EHMT2 tunes Siah1 protein levels [PMID:18536714, PMID:19696028, PMID:20181957, PMID:32479599, PMID:24809345, PMID:20187294, PMID:21847359].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing SIAH1 as a RING-dependent E3 ubiquitin ligase with auto-ubiquitination capacity resolved the fundamental question of how this Drosophila Sina homolog controls substrate proteolysis in mammalian cells.\",\n      \"evidence\": \"Mutagenesis of RING domain and C-terminal substrate-binding domain, proteasome inhibitor assays, DCC degradation assay\",\n      \"pmids\": [\"9858595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No E2 partner identified at this stage\", \"Crystal structure of full-length SIAH1 not available\", \"Mechanism of auto-ubiquitination versus substrate ubiquitination not distinguished\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Discovery that SIAH1 assembles an SCF-like complex (with SIP, Skp1, Ebi, and APC) to degrade β-catenin independently of GSK3β phosphorylation established a p53-induced alternative route for Wnt pathway antagonism.\",\n      \"evidence\": \"Co-IP, protein interaction mapping, β-catenin degradation assays, p53 induction, Xenopus embryo dorsalization assay\",\n      \"pmids\": [\"11389839\", \"11389840\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of Siah1 vs. GSK3β-dependent degradation in physiological contexts unclear\", \"Whether APC and Ebi are simultaneously required in all tissues not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of Numb and OBF-1 as SIAH1 substrates demonstrated that SIAH1-mediated degradation extends to Notch signaling and B-cell transcription, broadening the ligase's functional scope beyond Wnt.\",\n      \"evidence\": \"Co-IP, degradation assays, Notch signaling reporter, octamer-dependent transcription reporter, proteasome inhibitor\",\n      \"pmids\": [\"11752454\", \"11483517\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo Notch phenotype in Siah1 knockout not shown\", \"OBF-1 finding from single lab\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Structural determination of the SIAH1 dimer revealed a large electronegative β-sheet concavity as the SIP-binding surface, providing the first structural framework for understanding substrate recruitment.\",\n      \"evidence\": \"X-ray crystallography, structure-guided mutagenesis abolishing SIP binding in vitro and in cells\",\n      \"pmids\": [\"12421809\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"RING domain and zinc finger regions not resolved in this structure\", \"How dimer interface contributes to substrate selectivity not defined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstration that SIAH1 ubiquitinates synphilin-1 for proteasomal degradation—more efficiently than Parkin—and that the interaction occurs endogenously in brain tissue linked SIAH1 to Parkinson's disease-relevant protein quality control.\",\n      \"evidence\": \"Yeast two-hybrid, endogenous Co-IP in rat brain, ubiquitination assay, domain mapping, dopamine release assay\",\n      \"pmids\": [\"14506261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SIAH1 loss phenocopies Parkin loss in vivo not tested\", \"Lewy body localization of SIAH1 not examined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"The discovery that S-nitrosylation of GAPDH triggers GAPDH–Siah1 complex formation and nuclear translocation to initiate apoptosis established a novel nitric oxide–dependent cell death pathway mediated by SIAH1's NLS.\",\n      \"evidence\": \"Co-IP, S-nitrosylation assays, nuclear fractionation, NO deletion experiments in macrophages and neurons\",\n      \"pmids\": [\"15951807\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear substrates degraded by the GAPDH–Siah1 complex not identified\", \"Whether this pathway operates in non-neuronal tissues in vivo unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Crystal structure of the SIP–Siah1 complex showed how SIP's PXAXVXP motif legs straddle the Siah1 dimer surface while projecting a Skp1-binding domain, explaining the SCF-like E3 assembly geometry.\",\n      \"evidence\": \"Crystal structure, site-directed mutagenesis, cell-based functional assay\",\n      \"pmids\": [\"16085652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full quaternary architecture including Skp1 and substrate not structurally resolved\", \"How different substrates engage the same scaffold not determined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showing that SIAH1 mono- and di-ubiquitinates α-synuclein in a non-degradative manner that promotes aggregation and toxicity—disrupted by the PD-linked A30P mutation—revealed a pathogenic ubiquitination mode distinct from proteasomal targeting.\",\n      \"evidence\": \"Co-IP, in vivo ubiquitination with E2 UbcH8 identification, PD mutant analysis, aggregation and viability assays\",\n      \"pmids\": [\"18065497\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin chain linkage type on α-synuclein not determined\", \"Whether this modification occurs in patient brains not verified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery that ATM/ATR phosphorylation of SIAH1 at Ser19 disrupts HIPK2 binding and stabilizes HIPK2 for apoptotic signaling revealed how the DNA damage response directly modulates SIAH1 substrate access.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, kinase assay, phospho-site mutagenesis, Siah1 knockdown\",\n      \"pmids\": [\"18536714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Ser19 phosphorylation affects other SIAH1 substrates not tested\", \"Structural basis of phosphorylation-induced complex disruption unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identification of Aurora kinase-mediated EB3 phosphorylation as a signal to release EB3 from SIAH1 during mitosis demonstrated cell-cycle-dependent regulation of SIAH1 substrate targeting.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, kinase assay, phospho-site mutagenesis (Ser176), SIAH1 knockdown\",\n      \"pmids\": [\"19696028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other mitotic substrates regulated similarly not surveyed\", \"Mitotic phenotype of Siah1 depletion incompletely characterized\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Reconstitution of SIAH1-mediated polyubiquitination of non-phosphorylated β-catenin with purified proteins, and discovery that TBL1 competitively protects β-catenin during Wnt signaling, clarified the molecular logic of Wnt-dependent substrate shielding.\",\n      \"evidence\": \"In vitro ubiquitination with purified components, Co-IP, proteasomal degradation assay in cells\",\n      \"pmids\": [\"20181957\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TBL1 competition operates in all Wnt-responsive tissues not shown\", \"Structural basis of TBL1–β-catenin competition with SIAH1 unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of ELL1/ELL2 as SIAH1 substrates regulated by acetylation/deacetylation crosstalk (p300/HDAC3), with AFF4-bound ELL2 in the Super Elongation Complex being protected from SIAH1, linked SIAH1 to transcriptional elongation control and HIV-1 latency reversal.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, acetylation assay, SEC assembly analysis, HIV-1 transcription assays\",\n      \"pmids\": [\"32152128\", \"22483617\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SIAH1 targets other SEC components not assessed\", \"In vivo relevance for HIV latency reversal not tested in animal models\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that nuclear B23/nucleophosmin is trans-S-nitrosylated by GAPDH, enhancing B23–SIAH1 binding and disrupting the GAPDH–SIAH1 complex to suppress SIAH1 ligase activity, revealed a negative feedback loop providing neuroprotection.\",\n      \"evidence\": \"Co-IP, S-nitrosylation assay, C275S mutagenesis, NMDA neurotoxicity model in vivo\",\n      \"pmids\": [\"23027902\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other nuclear proteins undergo similar trans-nitrosylation-dependent regulation of SIAH1 unknown\", \"Quantitative contribution of B23 pathway versus other SIAH1 regulators not determined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstration that UPR transducers PERK/ATF4 and IRE1/sXBP1 induce SIAH1 transcription, and that SIAH1 stabilizes ATF4 by attenuating its proline hydroxylation, established a positive feedback loop amplifying ER stress-induced cell death, validated by reduced ischemic infarct in Siah-deficient mice.\",\n      \"evidence\": \"UPR pathway epistasis, siRNA knockdown, Siah1a+/−::Siah2−/− knockout mice, neuronal ischemia model\",\n      \"pmids\": [\"24809345\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ATF4 is a direct SIAH1 ubiquitination substrate or indirectly stabilized not fully resolved\", \"Contribution of Siah1 vs. Siah2 in the ischemic phenotype not separated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovery that synphilin-1 recruits SIAH1 to mitochondria in a PINK1-dependent manner to drive parkin-independent mitophagy established SIAH1 as an alternative mitophagy E3 ligase.\",\n      \"evidence\": \"Co-IP, LC3/Lamp1 recruitment, Atg5 knockdown epistasis, catalytically dead SIAH1 mutant, PINK1 disease mutant analysis\",\n      \"pmids\": [\"27334109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mitochondrial substrates ubiquitinated by SIAH1 during mitophagy not identified\", \"Physiological significance relative to Parkin-dependent mitophagy not quantified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstration of isoform-selective Akt3 ubiquitination by SIAH1—with the somatic E17K mutation escaping degradation and causing dysmorphic neurons—linked SIAH1 substrate selectivity to a specific neurodevelopmental pathology.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, Akt isoform selectivity analysis, Akt3-E17K mutant, neural morphology assay\",\n      \"pmids\": [\"31471318\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for Akt3 selectivity over Akt1/2 not determined\", \"Whether other brain somatic mutations escape SIAH1 degradation not explored\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of HCF1/HCF2 as SIAH1 substrate-binding domain blockers that prevent both auto-ubiquitination and ELL2 degradation refined the model of competitive inhibition regulating SIAH1 ligase output.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, ELL2 stability assay, SEC assembly, HIV-1 transactivation assay\",\n      \"pmids\": [\"32479599\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether HCF1/2 protect all SIAH1 substrates or only ELL2 not tested\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Expansion of SIAH1 substrate repertoire to include YBX-1 (at mapped Lys304), TRF2, XIAP, and phospho-YAP connected SIAH1-mediated ubiquitination to RNA modification, telomere maintenance, anti-apoptotic signaling, and Hippo pathway tumor suppression.\",\n      \"evidence\": \"Co-IP, ubiquitination assays with specific lysine mapping, phospho-site mutagenesis (YAP), in vivo xenograft (glioblastoma), senescence assays\",\n      \"pmids\": [\"35273154\", \"35261172\", \"35580525\", \"35723276\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most findings from individual labs awaiting independent replication\", \"Relative physiological importance of these substrates versus canonical SIAH1 targets not ranked\", \"Tissue specificity of each substrate relationship not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the full structural basis for SIAH1's remarkably broad substrate selectivity, the relative contributions of Siah1 versus Siah2 in overlapping pathways, and whether SIAH1 plays non-catalytic scaffolding roles independent of its E3 ligase activity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length SIAH1 structure with RING domain, zinc fingers, and substrate simultaneously resolved\", \"Systematic substrate identification (e.g., ubiquitin remnant profiling in SIAH1-null cells) not performed\", \"In vivo phenotype of Siah1-specific knockout (separated from Siah2) in adult tissues poorly characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3, 4, 6, 7, 8, 13, 22, 40, 41, 44]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [3, 4, 6, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 26, 29, 30]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8, 41, 42]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 8, 11, 37, 44]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 4, 14, 28, 29]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 6, 7, 13, 22, 40, 41]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [13, 22]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [15, 16]}\n    ],\n    \"complexes\": [\n      \"Siah1-SIP/CacyBP-Skp1-Ebi SCF-like complex\",\n      \"GAPDH-Siah1 nuclear translocation complex\",\n      \"PINK1-synphilin-1-SIAH1 mitophagy complex\"\n    ],\n    \"partners\": [\n      \"CACYBP\",\n      \"GAPDH\",\n      \"SNCAIP\",\n      \"CTNNB1\",\n      \"HIPK2\",\n      \"ELL2\",\n      \"NPM1\",\n      \"APC\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}