{"gene":"XIAP","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1999,"finding":"NMR structure of XIAP BIR2 domain revealed a three-stranded antiparallel beta-sheet and four alpha-helices resembling a zinc finger; mutagenesis showed conserved residues in the BIR1-BIR2 linker region are critical for caspase-3 inhibition, suggesting they bind the active site while the BIR domain interacts with an adjacent site on the enzyme.","method":"NMR structure determination, site-directed mutagenesis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic-resolution NMR structure combined with mutagenesis validating functional residues, published in Nature","pmids":["10548111"],"is_preprint":false},{"year":2001,"finding":"XIAP-deficient mice generated by homologous gene targeting are viable with no detectable apoptosis defects, but show compensatory upregulation of c-IAP1 and c-IAP2 protein levels, suggesting a compensatory mechanism among IAP family members.","method":"Gene targeting (knockout mouse), histopathology, Western blot","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular/molecular phenotype, multiple readouts","pmids":["11313486"],"is_preprint":false},{"year":1998,"finding":"hILP/XIAP inhibits ICE-induced apoptosis via a mechanism dependent on selective activation of JNK1 (c-Jun N-terminal kinase 1), demonstrating a caspase-independent anti-apoptotic mechanism.","method":"Cell-based apoptosis assay, kinase activation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single lab, defined pathway placement via cellular assay but limited orthogonal validation in abstract","pmids":["9600909"],"is_preprint":false},{"year":2003,"finding":"Akt (AKT1 and AKT2) physically interacts with and phosphorylates XIAP at serine-87 in vitro and in vivo; this phosphorylation protects XIAP from ubiquitination and proteasomal degradation and inhibits XIAP auto-ubiquitination, resulting in enhanced cell survival.","method":"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis (S87D and S87A mutants), siRNA knockdown, apoptosis assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay, mutagenesis with phosphomimetic and non-phosphorylatable mutants, in vivo validation, single lab with multiple orthogonal methods","pmids":["14645242"],"is_preprint":false},{"year":2007,"finding":"Crystal structure of the XIAP BIR1 domain in complex with TAB1 revealed a butterfly-shaped dimer; BIR1 directly interacts with TAB1 (an upstream adaptor for TAK1 kinase), and this interaction is essential for XIAP-induced TAK1 and NF-κB activation. BIR1 dimerization is also required for NF-κB activation. Smac inhibits the XIAP/TAB1 interaction without binding BIR1 directly.","method":"Crystal structure determination, structure-based mutagenesis, TAB1 siRNA knockdown, NF-κB reporter assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures of BIR1, TAB1, and complex, combined with mutagenesis and functional knockdown validation","pmids":["17560374"],"is_preprint":false},{"year":2008,"finding":"Inactivation of the XIAP RING domain by gene targeting stabilizes XIAP protein in apoptotic thymocytes, demonstrating that XIAP E3 ubiquitin ligase activity is a major determinant of XIAP protein stability. Paradoxically, increased XIAP-BIR-only protein leads to elevated caspase-3 activity and apoptosis, and DeltaRING cells are sensitized to TNF-α-induced apoptosis, showing the RING domain is required for full caspase inhibition in vivo.","method":"Gene targeting (RING domain deletion knock-in), caspase-3 activity assays, apoptosis assays, Eμ-Myc lymphoma model","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — clean knock-in mutagenesis in mice, multiple orthogonal phenotypic readouts, in vivo tumor model","pmids":["18708583"],"is_preprint":false},{"year":2009,"finding":"XIAP mediates NOD1/NOD2 innate immune signaling by physically interacting with the kinase RIP2 via its BIR2 domain; XIAP-deficient cells show markedly reduced NF-κB activation in response to NOD ligands. Both NOD1 and NOD2 associate with XIAP in a RIP2-dependent manner. SMAC and SMAC-mimetic compounds disrupt the XIAP-RIP2 interaction.","method":"Co-immunoprecipitation, XIAP-deficient cells, NF-κB reporter assays, NOD1/2 overexpression","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, loss-of-function cells with defined signaling phenotype, replicated by subsequent papers","pmids":["19667203"],"is_preprint":false},{"year":2009,"finding":"XIAP is the critical discriminator between type I and type II FAS-induced apoptosis: loss of XIAP function (by gene targeting or SMAC mimetic) renders hepatocytes and pancreatic beta-cells (type II cells) independent of BID for FAS-induced apoptosis, showing XIAP imposes a brake on effector caspases that necessitates mitochondrial amplification in type II cells.","method":"Gene targeting (XIAP KO mice), SMAC mimetic drug treatment, FAS-induced apoptosis assays, genetic epistasis with BID KO","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with two independent KO mouse models (XIAP and BID), defined cellular phenotype with multiple orthogonal approaches","pmids":["19626005"],"is_preprint":false},{"year":2009,"finding":"XIAP associates with PTEN in vitro and in vivo, promotes PTEN mono- and polyubiquitination, and acts as an E3 ubiquitin ligase for PTEN directly in vitro, leading to proteasomal degradation of PTEN and nuclear exclusion. XIAP-mediated regulation of Akt phosphorylation is PTEN-dependent.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, siRNA knockdown, XIAP-/- MEFs, Western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro ubiquitination reconstitution, in vivo Co-IP, KO MEFs with multiple orthogonal readouts, single lab","pmids":["19473982"],"is_preprint":false},{"year":2009,"finding":"MDM2 physically interacts with the IRES of the XIAP 5'-UTR and positively regulates XIAP IRES-dependent translation. DNA damage and irradiation trigger MDM2 dephosphorylation and cytoplasmic relocalization, increasing IRES-dependent XIAP translation.","method":"Co-immunoprecipitation (MDM2-XIAP IRES RNA interaction), IRES reporter assays, MDM2 transfection/localization studies","journal":"Cancer cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein-RNA binding demonstrated, functional IRES reporter validation, cytoplasmic localization linked to function, single lab","pmids":["19411066"],"is_preprint":false},{"year":2010,"finding":"S-nitrosylation of XIAP's RING domain (forming SNO-XIAP) by nitric oxide inhibits XIAP's E3 ubiquitin ligase and anti-apoptotic activity. SNO-caspase transnitrosylates XIAP (transferring NO to XIAP), promoting cell injury. SNO-XIAP was found in brains of Alzheimer's, Parkinson's, and Huntington's disease patients.","method":"Biotin-switch assay for S-nitrosylation, E3 ligase activity assays, mass spectrometry, transnitrosylation assay, human brain tissue analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — biochemical reconstitution of S-nitrosylation and transnitrosylation, enzymatic activity assays, human tissue validation, multiple orthogonal methods in single study","pmids":["20670888"],"is_preprint":false},{"year":2010,"finding":"XIAP promotes ubiquitination and degradation of COMMD1 (a copper efflux regulator) via its RING E3 ligase domain, thereby regulating intracellular copper export. Copper directly binds XIAP, causing a conformational change that destabilizes XIAP, reduces steady-state XIAP levels, and abrogates caspase inhibition, linking copper levels to cell death regulation.","method":"Ubiquitination assay, protein binding/conformational analysis, copper binding assay, caspase inhibition assay","journal":"Archives of biochemistry and biophysics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct copper binding demonstrated with conformational change, E3 ligase activity toward COMMD1 shown, multiple related methods, single lab review-style paper summarizing experimental findings","pmids":["17382285"],"is_preprint":false},{"year":2009,"finding":"COMMD1's COMM domain is required for interaction with XIAP; two conserved leucine repeats within the COMM domain are critically required for XIAP binding. A COMMD1 mutant unable to bind XIAP shows complete loss of basal ubiquitination and greatly increased protein stability, demonstrating XIAP is the primary E3 ligase controlling COMMD1 expression.","method":"GST pulldown, mutagenesis, ubiquitination assay, Western blot","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis defining binding domain combined with in vitro ubiquitination, clean structure-function analysis, single lab","pmids":["18795889"],"is_preprint":false},{"year":2010,"finding":"RNA-binding protein HuR directly binds to the XIAP IRES in vitro and in vivo, stimulates IRES-dependent translation of XIAP mRNA, and promotes recruitment of XIAP mRNA into polysomes. HuR-mediated cytoprotection against etoposide requires XIAP.","method":"RNA immunoprecipitation, in vitro RNA binding assay, polysome fractionation, XIAP knockdown rescue experiments","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct RNA-protein binding in vitro and in vivo, polysome analysis, epistasis rescue experiment, multiple orthogonal methods","pmids":["21102524"],"is_preprint":false},{"year":2010,"finding":"HuR binds to both the 3'-UTR and coding sequence of XIAP mRNA, stabilizing the transcript and elevating XIAP protein levels. Decreasing cellular polyamines increases cytoplasmic HuR and HuR-XIAP mRNA complexes, promoting XIAP mRNA stability and resistance to apoptosis.","method":"RNA immunoprecipitation, mRNA stability assay, HuR overexpression/knockdown, polyamine depletion experiments","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA-protein binding demonstrated, mRNA stability assay, single lab with multiple approaches","pmids":["19825980"],"is_preprint":false},{"year":2010,"finding":"ARTS (a mitochondrial protein) binds XIAP at BIR1 (distinct from caspase-binding sites) and recruits E3 ligase Siah-1 as an adaptor to induce Siah-1-mediated ubiquitination and degradation of XIAP. Cells lacking either Siah or ARTS contain higher steady-state XIAP levels.","method":"Co-immunoprecipitation, ubiquitination assay, ARTS-KO and Siah-KO cell analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — defined binding domain at BIR1, E3 ligase recruitment mechanism, KO cell validation, single lab with multiple orthogonal methods","pmids":["21185211"],"is_preprint":false},{"year":2013,"finding":"XIAP suppresses autophagy by acting as a previously unidentified E3 ubiquitin ligase for Mdm2, a negative regulator of p53. This XIAP-Mdm2-p53 pathway operates downstream of the PI3K/Akt pathway to control serum starvation-induced autophagy.","method":"In vitro ubiquitination assay, epistasis analysis with PI3K/Akt inhibitors, XIAP knockdown/overexpression, autophagy assays, mouse xenograft model","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro ubiquitination reconstitution, epistasis placement in pathway, in vivo tumor model, multiple orthogonal methods","pmids":["23749209"],"is_preprint":false},{"year":2014,"finding":"Loss of XIAP or its RING domain leads to TNF-dependent, RIP3-dependent excessive cell death and IL-1β secretion from dendritic cells triggered by TLR stimuli. Loss of XIAP results in aberrantly elevated ubiquitylation of RIP1 outside of TNFR complex I, and RING domain deletion (not just XIAP loss) is sufficient for this phenotype.","method":"Gene-targeted mice (XIAP KO and RING domain deletion), TLR stimulation assays, IL-1β ELISA, RIP3/caspase KO epistasis, ubiquitylation analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models (KO and RING deletion), epistasis with RIP3/TNF KOs, defined molecular mechanism for RIP1 ubiquitylation, replicated with multiple orthogonal methods","pmids":["24882010"],"is_preprint":false},{"year":2018,"finding":"Selective XIAP antagonism blocks NOD2-mediated inflammatory signaling and cytokine production by disrupting XIAP-RIP2 binding and preventing XIAP-mediated ubiquitination of RIP2. RIP2 kinase activity is dispensable for NOD2 signaling; rather, the conformation of the RIP2 kinase domain regulates binding to XIAP BIR2. Specific lysine residues on RIP2 are required for NOD2 pathway signaling (XIAP ubiquitination sites).","method":"Co-immunoprecipitation, ubiquitination site mapping (mass spectrometry), RIP2 kinase inhibitor studies, mutagenesis of RIP2 lysine residues, NF-κB/MAPK activation assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (Co-IP, MS-based ubiquitination site mapping, mutagenesis, kinase inhibitor studies), mechanistically rigorous, single comprehensive study","pmids":["29452636"],"is_preprint":false},{"year":2008,"finding":"Following TNFα stimulation, XIAP interacts with and ubiquitinates MEKK2, a kinase associated with bi-phasic NF-κB activation, to regulate a second wave of NF-κB activation in an ubiquitin ligase-dependent manner.","method":"Co-immunoprecipitation, ubiquitination assay, NF-κB reporter assays, XIAP overexpression","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP and ubiquitination assay demonstrated, NF-κB reporter functional validation, single lab, single study","pmids":["18761086"],"is_preprint":false},{"year":2009,"finding":"XIAP is cleaved by caspase-3 and caspase-7 during apoptosis in T lymphocytes, generating a p29 fragment. The p29 fragment retains the ability to bind caspase-3 and -7. Cleavage is inhibited by pan-caspase inhibitor Z-VAD.FMK.","method":"In vitro cleavage assay with recombinant caspases, co-immunoprecipitation, cell-based apoptosis assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution with purified caspases, binding retention assay of cleavage product, multiple cell line validation","pmids":["10766165"],"is_preprint":false},{"year":2004,"finding":"Full-length XIAP (but not a truncation mutant retaining only caspase-9 inhibition) blocks CD95-mediated mitochondrial cytochrome c and Smac/DIABLO release, loss of mitochondrial membrane potential, and caspase-3 processing, demonstrating that full-length XIAP inhibits caspase activation upstream of mitochondrial amplification of death receptor signals.","method":"Stable overexpression of full-length vs. truncation mutant XIAP, cytochrome c release assay, mitochondrial membrane potential assay, RNA interference knockdown","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — domain-dissection approach with matched overexpression constructs, multiple orthogonal readouts of mitochondrial integrity, RNAi confirmation, single lab","pmids":["15282301"],"is_preprint":false},{"year":2017,"finding":"XIAP (via its RING domain E3 ligase activity) directly binds Cdc42 and conjugates poly-ubiquitin chains to lysine-166 of Cdc42, targeting it for proteasomal degradation. XIAP depletion increases Cdc42 protein stability and activity, enhancing filopodia formation in a Cdc42-dependent manner and promoting tumor cell lung colonization.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, mutagenesis (K166 Cdc42), XIAP knockdown, filopodia quantification, in vivo lung colonization assay","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro ubiquitination with site-specific mutant, Co-IP, KD with defined cellular and in vivo phenotypes, multiple orthogonal methods","pmids":["28661476"],"is_preprint":false},{"year":2017,"finding":"ARTS (Sept4_i2) brings XIAP and Bcl-2 into a ternary complex at the outer mitochondrial membrane upon apoptotic induction, allowing XIAP to function as an E3 ligase that ubiquitylates Bcl-2 at lysine-17 for degradation. ARTS binding to Bcl-2 involves the BH3 domain of Bcl-2. Bcl-2 K17A mutant is more stable and more protective against apoptosis. Bcl-2 ubiquitylation is reduced in both XIAP- and Sept4/ARTS-deficient MEFs.","method":"Co-immunoprecipitation (ternary complex), in vitro ubiquitination assay, mutagenesis (Bcl-2 K17A, BH3 domain), KO MEFs, cell death assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro ubiquitination reconstitution, site-specific mutagenesis, ternary complex Co-IP, KO cell validation, multiple orthogonal methods in single study","pmids":["29020630"],"is_preprint":false},{"year":2016,"finding":"USP9X is the mitotic deubiquitinase of XIAP; USP9X deubiquitylates and stabilizes XIAP, leading to increased resistance toward mitotic spindle poisons. Knockdown of USP9X or XIAP sensitizes lymphoma cells to spindle poisons and delays lymphoma development in a murine model.","method":"Co-immunoprecipitation, deubiquitylation assay, siRNA knockdown, cell viability assays, Eμ-Myc murine lymphoma model","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — enzymatic deubiquitylation demonstrated, reciprocal functional validation with KD and in vivo model, single lab with multiple orthogonal methods","pmids":["27317434"],"is_preprint":false},{"year":2022,"finding":"USP7 deubiquitinates XIAP to inhibit its proteasomal degradation; USP7 inhibition reduces XIAP protein levels and induces caspase-dependent apoptosis. Combinatorial inhibition of USP7 and XIAP enhances apoptosis in vitro and in vivo.","method":"Proteomics/GSEA analysis, co-immunoprecipitation, ubiquitination/deubiquitination assay, USP7 modulation (overexpression and inhibition), in vivo tumor xenograft","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct deubiquitination of XIAP demonstrated, in vivo validation, single lab, first report of this interaction","pmids":["36243803"],"is_preprint":false},{"year":2010,"finding":"HAX-1 physically interacts with the BIR2 and BIR3 domains of XIAP (confirmed by GST pulldown and surface plasmon resonance); XIAP binds the C-terminal domain of HAX-1. HAX-1 suppresses polyubiquitination of XIAP, enhancing XIAP stability, and the HAX-1-XIAP complex inhibits apoptosis.","method":"GST pulldown, surface plasmon resonance, co-immunoprecipitation, polyubiquitination assay, cell viability assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct binding by multiple methods including quantitative SPR, ubiquitination assay, single lab","pmids":["20171186"],"is_preprint":false},{"year":2009,"finding":"Siva1 interacts with XIAP via the RING domain of XIAP and N-terminal domains of Siva1; XIAP, Siva1, and TAK1 form a ternary complex. Siva1 inhibits XIAP/TAK1-TAB1-mediated NF-κB activation while enhancing JNK activation, shifting the balance toward apoptosis. XIAP ubiquitin ligase activity mediates Lys-48-linked polyubiquitylation of Siva1.","method":"Co-immunoprecipitation (ternary complex), reporter gene assays, Siva1 knockdown, ubiquitination assay (K48 linkage determination)","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ternary complex Co-IP, ubiquitin linkage-specific assay, functional reporter assays, single lab","pmids":["19584092"],"is_preprint":false},{"year":2017,"finding":"XIAP promotes Lys63-linked polyubiquitination of HIF1α in a Ubc13 (E2)-dependent manner, promoting HIF1α nuclear retention and increased expression of HIF1-responsive genes. Inhibition of this pathway reduces nuclear HIF1α, promoter occupancy, and cell viability.","method":"Co-immunoprecipitation, Lys63-specific ubiquitin chain assay, Ubc13 depletion, HIF1α nuclear fractionation, HIF target gene expression assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific K63 ubiquitination demonstrated with E2 identity established, functional nuclear retention consequence shown, single lab","pmids":["28666324"],"is_preprint":false},{"year":2015,"finding":"XIAP and cIAP1 induce Beclin 1-dependent autophagy by activating NF-κB signaling through their E3 ubiquitin ligase activity, which leads to direct p65 binding to the Beclin 1 promoter and transcriptional activation. Pharmacological XIAP inhibition in overexpressing B-cell lymphoma lines reduces autophagosome biogenesis.","method":"Chromatin immunoprecipitation (p65/Beclin 1 promoter), NF-κB reporter assays, XIAP/cIAP1 overexpression, XIAP inhibitor treatment, autophagy quantification","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct promoter binding, E3 ligase activity required, single lab with multiple methods","pmids":["25669656"],"is_preprint":false},{"year":2014,"finding":"XIAP co-associates with the C-terminus of Patched1 (Ptch1) in primary cilia to inhibit Ptch1-mediated cell death. Inhibition of XIAP suppresses cell proliferation and causes cell death resembling a Hedgehog loss-of-function phenotype, demonstrating that co-ordinated brain and craniofacial development depends on XIAP mediation of Hh/Ptch1-regulated cell survival.","method":"Co-immunoprecipitation (XIAP-Ptch1-C), XIAP inhibitor treatment, primary cilia localization studies, cell death assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP and localization demonstrated, pharmacological inhibition phenotype, single lab, single study","pmids":["25292199"],"is_preprint":false},{"year":2019,"finding":"XIAP controls RIPK2 complex formation: XIAP-mediated ubiquitylation of RIPK2 prevents its deposition into detergent-insoluble higher-order speck-like structures; mutation of XIAP ubiquitylation sites on RIPK2 enhances complex formation. RIPK2 autophosphorylation at Y474 and phosphorylation status at S176 influence these structures.","method":"Detergent fractionation, RIPK2 mutagenesis (ubiquitylation sites, Y474, S176), bacterial infection model, confocal microscopy","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis combined with fractionation and infection model, single lab","pmids":["31350258"],"is_preprint":false},{"year":2023,"finding":"In XIAP-deficient macrophages, extrinsic apoptotic caspase-8 promotes pyroptotic GSDMD processing; combined deletion of apoptotic (caspase-3/-7) and pyroptotic (GSDMD) machinery is required to fully abrogate cell death and bioactive IL-1β release. Caspase-8-driven NLRP3 inflammasome assembly and IL-1β maturation is independent of GSDMD and pannexin-1 channel, distinguishing this from mitochondrial apoptosis-triggered NLRP3 activation.","method":"XIAP-deficient patient tissue analysis, macrophage KO (caspase-1/-3/-7/-11, BID, GSDMD/E, pannexin-1) epistasis, caspase activity assays, IL-1β ELISA, cell death quantification","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — comprehensive genetic epistasis with multiple KO combinations, patient tissue validation, multiple orthogonal cell death and inflammatory readouts","pmids":["36647737"],"is_preprint":false},{"year":2024,"finding":"XIAP functions as an E3 ubiquitin ligase for IFT88 (intraflagellar transport protein 88); TGF-β enhances XIAP-mediated ubiquitination and proteasomal degradation of IFT88 in hepatic stellate cells (HSCs), leading to primary cilia loss and HSC activation. Blocking XIAP-mediated IFT88 degradation prevents TGF-β-induced HSC activation and liver fibrosis.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, Ift88-KO mice, XIAP inhibition (genetic and pharmacological), TGF-β stimulation, liver fibrosis model (CCl4)","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro ubiquitination reconstitution, KO mouse model, TGF-β pathway epistasis, in vivo fibrosis rescue, multiple orthogonal methods in single study","pmids":["38351372"],"is_preprint":false},{"year":2022,"finding":"XIAP mediates RIPK2 ubiquitylation and involves a TAB1/RIPK2 complex to induce transcriptional up-regulation and secretion of IL-8 and other chemokines responsible for intra-tumour neutrophil accumulation in melanoma. Alteration of the XIAP-RIPK2-TAB1 axis or neutrophil depletion reduces melanoma growth.","method":"In vitro XIAP-RIPK2 ubiquitylation analysis, TAB1/RIPK2 complex analysis, XIAP manipulation in melanoma models, neutrophil depletion, cytokine measurement, mouse melanoma models","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic in vitro and in vivo analyses, mouse models, single lab but multiple approaches","pmids":["35437868"],"is_preprint":false},{"year":2006,"finding":"BIRC4/XIAP protein is present in postsynaptic dendritic spines in unstimulated zebra finch auditory forebrain, where it binds and sequesters active caspase-3. Following song stimuli, caspase-3 activity at postsynaptic sites increases briefly, and caspase-3 activity is required to consolidate a persistent physiological memory trace, suggesting XIAP regulates a non-apoptotic function of caspase-3 in synaptic plasticity.","method":"Confocal and immunoelectron microscopy (localization to dendritic spines), pharmacological interference of caspase-3, zenk gene habituation assay","journal":"Neuron","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct subcellular localization by immunoelectron microscopy, pharmacological functional intervention, non-mammalian ortholog in avian brain but consistent protein function","pmids":["17178408"],"is_preprint":false},{"year":2009,"finding":"GDF5 and BMP2 stimulate the physical interaction between BMPR2 and XIAP, reducing XIAP ubiquitination and increasing XIAP protein stability, thereby allowing XIAP to bind and inactivate activated caspases and prevent apoptosis in mouse embryonic fibroblasts.","method":"Co-immunoprecipitation (BMPR2-XIAP), ubiquitination assay, BMPR2 loss-of-function, apoptosis assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP and ubiquitination assay demonstrated, receptor loss-of-function used, single lab","pmids":["19782107"],"is_preprint":false}],"current_model":"XIAP is a multifunctional protein that directly inhibits caspases-3, -7, and -9 through its BIR2 and BIR3 domains (with the BIR1-BIR2 linker critical for caspase-3 inhibition) and functions as a RING-domain E3 ubiquitin ligase targeting substrates including caspases, PTEN, Bcl-2, COMMD1, Cdc42, Mdm2, HIF1α, IFT88, MEKK2, and Siva1; its anti-apoptotic activity and stability are regulated by post-translational modifications (Akt phosphorylation at Ser87, S-nitrosylation of the RING domain, deubiquitylation by USP9X and USP7), and XIAP mediates innate immune signaling by binding RIP2 via BIR2 to facilitate NOD1/2-dependent NF-κB activation, discriminates type I from type II FAS-induced apoptosis by imposing a brake on effector caspases in type II cells, and controls necroptosis by regulating RIP1/RIP3-dependent death pathways."},"narrative":{"mechanistic_narrative":"XIAP is a bifunctional anti-apoptotic protein that combines direct caspase inhibition with RING-domain E3 ubiquitin ligase activity to control cell death, innate immune signaling, and cell-fate decisions [PMID:10548111, PMID:18708583]. Its tandem BIR domains engage the apoptotic machinery: the BIR1-BIR2 linker binds the caspase-3 active site while the BIR domain contacts an adjacent enzyme surface [PMID:10548111], and full-length XIAP, but not caspase-9-inhibiting truncations, blocks death-receptor signaling upstream of mitochondrial cytochrome c and Smac release [PMID:15282301]. XIAP is the molecular discriminator between type I and type II FAS apoptosis, imposing a brake on effector caspases that renders type II cells dependent on mitochondrial amplification [PMID:19626005]. Its C-terminal RING domain functions as an E3 ligase that ubiquitinates a broad substrate set—including PTEN, COMMD1, Cdc42, Bcl-2, Mdm2, Siva1, HIF1α, and IFT88—linking XIAP to PTEN/Akt survival signaling, copper homeostasis, cytoskeletal regulation, autophagy, and ciliary biology [PMID:19473982, PMID:18795889, PMID:28661476, PMID:29020630, PMID:23749209, PMID:28666324, PMID:38351372]. RING-dependent auto-ubiquitination also sets XIAP's own abundance, and the RING domain is required for full caspase inhibition in vivo [PMID:18708583]. Beyond apoptosis, XIAP nucleates NF-κB signaling: its BIR1 domain dimerizes and binds TAB1 to activate TAK1/NF-κB [PMID:17560374], while its BIR2 domain binds and ubiquitinates RIP2 to drive NOD1/2 innate immune responses [PMID:19667203, PMID:29452636]. XIAP further restrains necroptotic and inflammatory death by regulating RIP1/RIP3- and RIPK2-dependent pathways, with its loss causing TNF/RIP3-dependent excessive cell death and caspase-8-driven inflammasome activation [PMID:24882010, PMID:36647737]. XIAP stability is tuned by Akt phosphorylation at Ser87 [PMID:14645242], RING S-nitrosylation [PMID:20670888], ARTS/Siah-1-mediated degradation [PMID:21185211], and deubiquitylation by USP9X and USP7 [PMID:27317434, PMID:36243803], while its translation is controlled through IRES-dependent mechanisms involving MDM2 and HuR [PMID:19411066, PMID:21102524].","teleology":[{"year":1999,"claim":"Established the structural and residue-level basis for how XIAP inhibits caspase-3, defining the BIR2 domain fold and the linker region that engages the protease active site.","evidence":"NMR structure of the BIR2 domain with site-directed mutagenesis","pmids":["10548111"],"confidence":"High","gaps":["Did not resolve the BIR3-caspase-9 interaction","Mechanism of RING-domain E3 activity not addressed"]},{"year":2001,"claim":"Tested whether XIAP is essential for apoptosis suppression in vivo, revealing functional redundancy through compensatory upregulation of c-IAP1/2.","evidence":"XIAP knockout mouse with histopathology and Western blot","pmids":["11313486"],"confidence":"High","gaps":["Redundancy obscures cell-type-specific XIAP roles","Non-apoptotic functions not examined"]},{"year":2004,"claim":"Distinguished caspase-9- versus effector-caspase-directed XIAP activity, showing full-length XIAP blocks death-receptor signaling upstream of mitochondrial amplification.","evidence":"Domain-dissection overexpression with cytochrome c release and mitochondrial potential assays","pmids":["15282301"],"confidence":"High","gaps":["Did not establish which caspase step is rate-limiting in physiological context","Single-lab overexpression system"]},{"year":2007,"claim":"Defined the structural basis by which XIAP activates NF-κB, showing BIR1 dimerization and TAB1 binding drive TAK1/NF-κB signaling independent of caspase inhibition.","evidence":"Crystal structure of BIR1-TAB1 complex with mutagenesis and NF-κB reporters","pmids":["17560374"],"confidence":"High","gaps":["Physiological stimuli triggering this axis not fully mapped","Relationship to RIP2 signaling not addressed here"]},{"year":2008,"claim":"Demonstrated that the RING domain governs XIAP protein stability and is required for full caspase inhibition in vivo, revealing a paradoxical pro-apoptotic effect of BIR-only protein.","evidence":"RING-deletion knock-in mice with caspase-3 activity and lymphoma models","pmids":["18708583"],"confidence":"High","gaps":["Substrate(s) accounting for in vivo phenotype not identified here","Mechanism linking stability to caspase inhibition incomplete"]},{"year":2009,"claim":"Identified XIAP as the discriminator between type I and type II FAS apoptosis, defining its role as an effector-caspase brake requiring mitochondrial amplification in type II cells.","evidence":"XIAP and BID knockout mice with genetic epistasis and SMAC mimetic","pmids":["19626005"],"confidence":"High","gaps":["Molecular determinant of type I vs II identity beyond XIAP threshold unclear"]},{"year":2009,"claim":"Connected XIAP to innate immunity by showing BIR2-RIP2 binding is required for NOD1/2-dependent NF-κB activation.","evidence":"Reciprocal Co-IP and NF-κB reporters in XIAP-deficient cells","pmids":["19667203"],"confidence":"High","gaps":["Ubiquitin linkage on RIP2 not yet defined at this stage"]},{"year":2009,"claim":"Expanded XIAP's E3 ligase substrate repertoire to PTEN, linking XIAP to Akt survival signaling via PTEN degradation and nuclear exclusion.","evidence":"In vitro ubiquitination, Co-IP, and XIAP-/- MEFs","pmids":["19473982"],"confidence":"High","gaps":["Single-lab data","In vivo physiological relevance of PTEN regulation not established"]},{"year":2009,"claim":"Established XIAP as the primary E3 ligase controlling COMMD1 abundance, mapping the COMM domain leucine repeats required for binding.","evidence":"GST pulldown, mutagenesis, and ubiquitination assay","pmids":["18795889"],"confidence":"High","gaps":["Physiological copper-handling consequence not directly tested here"]},{"year":2010,"claim":"Defined post-translational and translational control of XIAP: S-nitrosylation inactivates the RING, and IRES-dependent translation is regulated by MDM2 and HuR.","evidence":"Biotin-switch assays, IRES reporters, RNA-protein binding, polysome fractionation","pmids":["20670888","19411066","21102524","19825980"],"confidence":"Medium","gaps":["Integration of these regulatory layers in single cells not resolved","Some findings single-lab and Medium confidence"]},{"year":2010,"claim":"Identified the ARTS/Siah-1 axis as a dedicated route for XIAP degradation through BIR1 binding distinct from caspase sites.","evidence":"Co-IP, ubiquitination assays, ARTS-KO and Siah-KO cells","pmids":["21185211"],"confidence":"High","gaps":["Conditions selecting this pathway over auto-ubiquitination unclear"]},{"year":2014,"claim":"Revealed XIAP, via its RING domain, restrains TNF/RIP3-dependent inflammatory cell death and aberrant RIP1 ubiquitylation in dendritic cells.","evidence":"XIAP KO and RING-deletion mice with RIP3/caspase epistasis and IL-1β ELISA","pmids":["24882010"],"confidence":"High","gaps":["Direct enzymatic relationship between XIAP and RIP1 not fully defined"]},{"year":2017,"claim":"Broadened XIAP substrate diversity to Cdc42, HIF1α, and Bcl-2, linking it to cytoskeletal dynamics, hypoxic gene expression, and mitochondrial apoptosis via distinct ubiquitin linkages.","evidence":"In vitro ubiquitination with site-specific mutants, ternary-complex Co-IP, KO MEFs and in vivo assays","pmids":["28661476","28666324","29020630"],"confidence":"High","gaps":["Substrate selectivity determinants among many targets unresolved","Some axes Medium confidence"]},{"year":2018,"claim":"Mechanistically refined NOD2 signaling, showing RIP2 kinase activity is dispensable while its conformation governs XIAP BIR2 binding and lysine-specific ubiquitination drives the pathway.","evidence":"Co-IP, MS ubiquitination-site mapping, RIP2 mutagenesis and kinase inhibitors","pmids":["29452636"],"confidence":"High","gaps":["Downstream E2 and chain architecture not fully detailed"]},{"year":2023,"claim":"Showed that in XIAP deficiency, caspase-8 drives pyroptotic GSDMD processing and GSDMD-independent NLRP3/IL-1β activation, explaining the inflammatory phenotype of XIAP loss.","evidence":"Patient tissue plus multi-KO macrophage epistasis and IL-1β readouts","pmids":["36647737"],"confidence":"High","gaps":["Direct XIAP substrate restraining caspase-8 not pinpointed"]},{"year":2024,"claim":"Extended XIAP E3 activity to ciliary biology, showing TGF-β-driven XIAP ubiquitination of IFT88 causes cilia loss and hepatic stellate cell activation in fibrosis.","evidence":"In vitro ubiquitination, Ift88-KO mice, and CCl4 liver fibrosis model","pmids":["38351372"],"confidence":"High","gaps":["Generalizability to other ciliated tissues not tested"]},{"year":null,"claim":"How XIAP achieves selectivity among its many E3 substrates and how its caspase-inhibitory, NF-κB-activating, and ligase functions are coordinated within a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model of substrate choice","Spatiotemporal partitioning of XIAP functions undefined","Mendelian disease link not directly established within this corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,20,21]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[5,8,12,22,23,28,33]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,7,21]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[8,22,28]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9,14]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[30,33]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[23]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,7,21,17,32]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,18,31,32]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,19,27]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[16,29]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[5,8,12,22,23,33]}],"complexes":["XIAP-RIP2 (NOD signaling)","XIAP-TAB1-TAK1","ARTS-XIAP-Bcl-2 ternary complex","XIAP-Siva1-TAK1 ternary complex"],"partners":["RIP2","TAB1","PTEN","COMMD1","CDC42","BCL-2","USP9X","USP7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P98170","full_name":"E3 ubiquitin-protein ligase XIAP","aliases":["Baculoviral IAP repeat-containing protein 4","IAP-like protein","ILP","hILP","Inhibitor of apoptosis protein 3","IAP-3","hIAP-3","hIAP3","RING-type E3 ubiquitin transferase XIAP","X-linked inhibitor of apoptosis protein","X-linked IAP"],"length_aa":497,"mass_kda":56.7,"function":"Multi-functional protein which regulates not only caspases and apoptosis, but also modulates inflammatory signaling and immunity, copper homeostasis, mitogenic kinase signaling, cell proliferation, as well as cell invasion and metastasis (PubMed:11257230, PubMed:11257231, PubMed:11447297, PubMed:12121969, PubMed:12620238, PubMed:17560374, PubMed:17967870, PubMed:19473982, PubMed:20154138, PubMed:22103349, PubMed:9230442). Acts as a direct caspase inhibitor (PubMed:11257230, PubMed:11257231, PubMed:12620238). Directly bind to the active site pocket of CASP3 and CASP7 and obstructs substrate entry (PubMed:11257230, PubMed:11257231, PubMed:16352606, PubMed:16916640). Inactivates CASP9 by keeping it in a monomeric, inactive state (PubMed:12620238). Acts as an E3 ubiquitin-protein ligase regulating NF-kappa-B signaling and the target proteins for its E3 ubiquitin-protein ligase activity include: RIPK1, RIPK2, MAP3K2/MEKK2, DIABLO/SMAC, AIFM1, CCS, PTEN and BIRC5/survivin (PubMed:17560374, PubMed:17967870, PubMed:19473982, PubMed:20154138, PubMed:22103349, PubMed:22607974, PubMed:29452636, PubMed:30026309). Acts as an important regulator of innate immunity by mediating 'Lys-63'-linked polyubiquitination of RIPK2 downstream of NOD1 and NOD2, thereby transforming RIPK2 into a scaffolding protein for downstream effectors, ultimately leading to activation of the NF-kappa-B and MAP kinases signaling (PubMed:19667203, PubMed:22607974, PubMed:29452636, PubMed:30026309). 'Lys-63'-linked polyubiquitination of RIPK2 also promotes recruitment of the LUBAC complex to RIPK2 (PubMed:22607974, PubMed:29452636). Regulates the BMP signaling pathway and the SMAD and MAP3K7/TAK1 dependent pathways leading to NF-kappa-B and JNK activation (PubMed:17560374). Ubiquitination of CCS leads to enhancement of its chaperone activity toward its physiologic target, SOD1, rather than proteasomal degradation (PubMed:20154138). Ubiquitination of MAP3K2/MEKK2 and AIFM1 does not lead to proteasomal degradation (PubMed:17967870, PubMed:22103349). Plays a role in copper homeostasis by ubiquitinating COMMD1 and promoting its proteasomal degradation (PubMed:14685266). Can also function as E3 ubiquitin-protein ligase of the NEDD8 conjugation pathway, targeting effector caspases for neddylation and inactivation (PubMed:21145488). Ubiquitinates and therefore mediates the proteasomal degradation of BCL2 in response to apoptosis (PubMed:29020630). Protects cells from spontaneous formation of the ripoptosome, a large multi-protein complex that has the capability to kill cancer cells in a caspase-dependent and caspase-independent manner (PubMed:22095281). Suppresses ripoptosome formation by ubiquitinating RIPK1 and CASP8 (PubMed:22095281). Acts as a positive regulator of Wnt signaling and ubiquitinates TLE1, TLE2, TLE3, TLE4 and AES (PubMed:22304967). Ubiquitination of TLE3 results in inhibition of its interaction with TCF7L2/TCF4 thereby allowing efficient recruitment and binding of the transcriptional coactivator beta-catenin to TCF7L2/TCF4 that is required to initiate a Wnt-specific transcriptional program (PubMed:22304967)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/P98170/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/XIAP","classification":"Not Classified","n_dependent_lines":12,"n_total_lines":1208,"dependency_fraction":0.009933774834437087},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DYNLL1","stoichiometry":0.2},{"gene":"DYNLL2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/XIAP","total_profiled":1310},"omim":[{"mim_id":"621194","title":"SPERMATOGENIC FAILURE 99; SPGF99","url":"https://www.omim.org/entry/621194"},{"mim_id":"621072","title":"BACULOVIRAL IAP REPEAT-CONTAINING PROTEIN 8; BIRC8","url":"https://www.omim.org/entry/621072"},{"mim_id":"615122","title":"LYMPHOPROLIFERATIVE SYNDROME 2; LPFS2","url":"https://www.omim.org/entry/615122"},{"mim_id":"612326","title":"TRANSCRIPTION FACTOR 25; TCF25","url":"https://www.omim.org/entry/612326"},{"mim_id":"608299","title":"RING FINGER PROTEIN 34; RNF34","url":"https://www.omim.org/entry/608299"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/XIAP"},"hgnc":{"alias_symbol":["hILP","ILP-1"],"prev_symbol":["API3","BIRC4"]},"alphafold":{"accession":"P98170","domains":[{"cath_id":"1.10.1170.10","chopping":"27-87","consensus_level":"high","plddt":90.291,"start":27,"end":87},{"cath_id":"1.10.1170.10","chopping":"159-224","consensus_level":"high","plddt":90.2802,"start":159,"end":224},{"cath_id":"1.10.1170.10","chopping":"261-357","consensus_level":"high","plddt":83.268,"start":261,"end":357},{"cath_id":"1.10.8.10","chopping":"371-419","consensus_level":"high","plddt":85.4594,"start":371,"end":419},{"cath_id":"3.30.40.10","chopping":"450-494","consensus_level":"high","plddt":92.3433,"start":450,"end":494}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P98170","model_url":"https://alphafold.ebi.ac.uk/files/AF-P98170-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P98170-F1-predicted_aligned_error_v6.png","plddt_mean":74.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=XIAP","jax_strain_url":"https://www.jax.org/strain/search?query=XIAP"},"sequence":{"accession":"P98170","fasta_url":"https://rest.uniprot.org/uniprotkb/P98170.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P98170/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P98170"}},"corpus_meta":[{"pmid":"19626005","id":"PMC_19626005","title":"XIAP discriminates between type I and type II FAS-induced apoptosis.","date":"2009","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/19626005","citation_count":371,"is_preprint":false},{"pmid":"11313486","id":"PMC_11313486","title":"Characterization of XIAP-deficient mice.","date":"2001","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/11313486","citation_count":356,"is_preprint":false},{"pmid":"14645242","id":"PMC_14645242","title":"Akt phosphorylation and stabilization of X-linked inhibitor of apoptosis protein (XIAP).","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14645242","citation_count":355,"is_preprint":false},{"pmid":"11445667","id":"PMC_11445667","title":"XIAP: apoptotic brake and promising therapeutic target.","date":"2001","source":"Apoptosis : an international journal on programmed cell death","url":"https://pubmed.ncbi.nlm.nih.gov/11445667","citation_count":338,"is_preprint":false},{"pmid":"21959933","id":"PMC_21959933","title":"Fas death receptor signalling: roles of Bid and XIAP.","date":"2011","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/21959933","citation_count":292,"is_preprint":false},{"pmid":"10548111","id":"PMC_10548111","title":"NMR structure and mutagenesis of the inhibitor-of-apoptosis protein XIAP.","date":"1999","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/10548111","citation_count":283,"is_preprint":false},{"pmid":"16322751","id":"PMC_16322751","title":"Targeting XIAP for the treatment of malignancy.","date":"2006","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/16322751","citation_count":254,"is_preprint":false},{"pmid":"19667203","id":"PMC_19667203","title":"XIAP mediates NOD signaling via interaction with RIP2.","date":"2009","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/19667203","citation_count":253,"is_preprint":false},{"pmid":"17560374","id":"PMC_17560374","title":"XIAP induces NF-kappaB activation via the BIR1/TAB1 interaction and BIR1 dimerization.","date":"2007","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/17560374","citation_count":233,"is_preprint":false},{"pmid":"11433370","id":"PMC_11433370","title":"XIAP, the guardian angel.","date":"2001","source":"Nature reviews. 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the apoptosis regulators XIAP, XAF1, and Smac/DIABLO in gastric adenocarcinomas.","date":"2007","source":"Diagnostic molecular pathology : the American journal of surgical pathology, part B","url":"https://pubmed.ncbi.nlm.nih.gov/17471152","citation_count":27,"is_preprint":false},{"pmid":"24616127","id":"PMC_24616127","title":"Clinical flow cytometric screening of SAP and XIAP expression accurately identifies patients with SH2D1A and XIAP/BIRC4 mutations.","date":"2014","source":"Cytometry. Part B, Clinical cytometry","url":"https://pubmed.ncbi.nlm.nih.gov/24616127","citation_count":26,"is_preprint":false},{"pmid":"31350258","id":"PMC_31350258","title":"XIAP controls RIPK2 signaling by preventing its deposition in speck-like structures.","date":"2019","source":"Life science alliance","url":"https://pubmed.ncbi.nlm.nih.gov/31350258","citation_count":26,"is_preprint":false},{"pmid":"11726787","id":"PMC_11726787","title":"Regulation of caspases and XIAP in the brain after asphyxial cardiac arrest in rats.","date":"2001","source":"Neuroreport","url":"https://pubmed.ncbi.nlm.nih.gov/11726787","citation_count":26,"is_preprint":false},{"pmid":"32181504","id":"PMC_32181504","title":"LncRNA CYTOR attenuates sepsis-induced myocardial injury via regulating miR-24/XIAP.","date":"2020","source":"Cell biochemistry and function","url":"https://pubmed.ncbi.nlm.nih.gov/32181504","citation_count":26,"is_preprint":false},{"pmid":"28666324","id":"PMC_28666324","title":"XIAP upregulates expression of HIF target genes by targeting HIF1α for Lys63-linked polyubiquitination.","date":"2017","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/28666324","citation_count":25,"is_preprint":false},{"pmid":"35437868","id":"PMC_35437868","title":"XIAP promotes melanoma growth by inducing tumour neutrophil infiltration.","date":"2022","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/35437868","citation_count":24,"is_preprint":false},{"pmid":"29236891","id":"PMC_29236891","title":"High expression of XIAP and Bcl-2 may inhibit programmed cell death in glioblastomas.","date":"2017","source":"Arquivos de neuro-psiquiatria","url":"https://pubmed.ncbi.nlm.nih.gov/29236891","citation_count":24,"is_preprint":false},{"pmid":"20431038","id":"PMC_20431038","title":"XIAP reduces muscle proteolysis induced by CKD.","date":"2010","source":"Journal of the American Society of Nephrology : JASN","url":"https://pubmed.ncbi.nlm.nih.gov/20431038","citation_count":24,"is_preprint":false},{"pmid":"26802028","id":"PMC_26802028","title":"XIAP-associating factor 1, a transcriptional target of BRD7, contributes to endothelial cell senescence.","date":"2016","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/26802028","citation_count":23,"is_preprint":false},{"pmid":"19013033","id":"PMC_19013033","title":"Inhibiting XIAP expression by RNAi to inhibit proliferation and enhance radiosensitivity in laryngeal cancer cell line.","date":"2008","source":"Auris, nasus, larynx","url":"https://pubmed.ncbi.nlm.nih.gov/19013033","citation_count":23,"is_preprint":false},{"pmid":"25292199","id":"PMC_25292199","title":"Co-ordinated brain and craniofacial development depend upon Patched1/XIAP regulation of cell survival.","date":"2014","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25292199","citation_count":23,"is_preprint":false},{"pmid":"26305518","id":"PMC_26305518","title":"Clinical Flow Cytometric Screening of SAP and XIAP Expression Accurately Identifies Patients with SH2D1A and XIAP/BIRC4 Mutations.","date":"2014","source":"Cytometry. Part B, Clinical cytometry","url":"https://pubmed.ncbi.nlm.nih.gov/26305518","citation_count":22,"is_preprint":false},{"pmid":"26840743","id":"PMC_26840743","title":"Urocortin-1 Mediated Cardioprotection Involves XIAP and CD40-Ligand Recovery: Role of EPAC2 and ERK1/2.","date":"2016","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/26840743","citation_count":22,"is_preprint":false},{"pmid":"22653317","id":"PMC_22653317","title":"XIAP: a potential determinant of ovarian follicular fate.","date":"2012","source":"Reproduction (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/22653317","citation_count":22,"is_preprint":false},{"pmid":"25003840","id":"PMC_25003840","title":"XIAP protein is induced by placenta growth factor (PLGF) and decreased during preeclampsia in trophoblast cells.","date":"2014","source":"Systems biology in reproductive medicine","url":"https://pubmed.ncbi.nlm.nih.gov/25003840","citation_count":22,"is_preprint":false},{"pmid":"38351372","id":"PMC_38351372","title":"XIAP-mediated degradation of IFT88 disrupts HSC cilia to stimulate HSC activation and liver fibrosis.","date":"2024","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/38351372","citation_count":21,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":44999,"output_tokens":9532,"usd":0.138988,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":19735,"output_tokens":4909,"usd":0.1107,"stage2_stop_reason":"end_turn"},"total_usd":0.249688,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"NMR structure of XIAP BIR2 domain revealed a three-stranded antiparallel beta-sheet and four alpha-helices resembling a zinc finger; mutagenesis showed conserved residues in the BIR1-BIR2 linker region are critical for caspase-3 inhibition, suggesting they bind the active site while the BIR domain interacts with an adjacent site on the enzyme.\",\n      \"method\": \"NMR structure determination, site-directed mutagenesis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic-resolution NMR structure combined with mutagenesis validating functional residues, published in Nature\",\n      \"pmids\": [\"10548111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"XIAP-deficient mice generated by homologous gene targeting are viable with no detectable apoptosis defects, but show compensatory upregulation of c-IAP1 and c-IAP2 protein levels, suggesting a compensatory mechanism among IAP family members.\",\n      \"method\": \"Gene targeting (knockout mouse), histopathology, Western blot\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular/molecular phenotype, multiple readouts\",\n      \"pmids\": [\"11313486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"hILP/XIAP inhibits ICE-induced apoptosis via a mechanism dependent on selective activation of JNK1 (c-Jun N-terminal kinase 1), demonstrating a caspase-independent anti-apoptotic mechanism.\",\n      \"method\": \"Cell-based apoptosis assay, kinase activation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single lab, defined pathway placement via cellular assay but limited orthogonal validation in abstract\",\n      \"pmids\": [\"9600909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Akt (AKT1 and AKT2) physically interacts with and phosphorylates XIAP at serine-87 in vitro and in vivo; this phosphorylation protects XIAP from ubiquitination and proteasomal degradation and inhibits XIAP auto-ubiquitination, resulting in enhanced cell survival.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis (S87D and S87A mutants), siRNA knockdown, apoptosis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay, mutagenesis with phosphomimetic and non-phosphorylatable mutants, in vivo validation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"14645242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of the XIAP BIR1 domain in complex with TAB1 revealed a butterfly-shaped dimer; BIR1 directly interacts with TAB1 (an upstream adaptor for TAK1 kinase), and this interaction is essential for XIAP-induced TAK1 and NF-κB activation. BIR1 dimerization is also required for NF-κB activation. Smac inhibits the XIAP/TAB1 interaction without binding BIR1 directly.\",\n      \"method\": \"Crystal structure determination, structure-based mutagenesis, TAB1 siRNA knockdown, NF-κB reporter assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures of BIR1, TAB1, and complex, combined with mutagenesis and functional knockdown validation\",\n      \"pmids\": [\"17560374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Inactivation of the XIAP RING domain by gene targeting stabilizes XIAP protein in apoptotic thymocytes, demonstrating that XIAP E3 ubiquitin ligase activity is a major determinant of XIAP protein stability. Paradoxically, increased XIAP-BIR-only protein leads to elevated caspase-3 activity and apoptosis, and DeltaRING cells are sensitized to TNF-α-induced apoptosis, showing the RING domain is required for full caspase inhibition in vivo.\",\n      \"method\": \"Gene targeting (RING domain deletion knock-in), caspase-3 activity assays, apoptosis assays, Eμ-Myc lymphoma model\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — clean knock-in mutagenesis in mice, multiple orthogonal phenotypic readouts, in vivo tumor model\",\n      \"pmids\": [\"18708583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"XIAP mediates NOD1/NOD2 innate immune signaling by physically interacting with the kinase RIP2 via its BIR2 domain; XIAP-deficient cells show markedly reduced NF-κB activation in response to NOD ligands. Both NOD1 and NOD2 associate with XIAP in a RIP2-dependent manner. SMAC and SMAC-mimetic compounds disrupt the XIAP-RIP2 interaction.\",\n      \"method\": \"Co-immunoprecipitation, XIAP-deficient cells, NF-κB reporter assays, NOD1/2 overexpression\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, loss-of-function cells with defined signaling phenotype, replicated by subsequent papers\",\n      \"pmids\": [\"19667203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"XIAP is the critical discriminator between type I and type II FAS-induced apoptosis: loss of XIAP function (by gene targeting or SMAC mimetic) renders hepatocytes and pancreatic beta-cells (type II cells) independent of BID for FAS-induced apoptosis, showing XIAP imposes a brake on effector caspases that necessitates mitochondrial amplification in type II cells.\",\n      \"method\": \"Gene targeting (XIAP KO mice), SMAC mimetic drug treatment, FAS-induced apoptosis assays, genetic epistasis with BID KO\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with two independent KO mouse models (XIAP and BID), defined cellular phenotype with multiple orthogonal approaches\",\n      \"pmids\": [\"19626005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"XIAP associates with PTEN in vitro and in vivo, promotes PTEN mono- and polyubiquitination, and acts as an E3 ubiquitin ligase for PTEN directly in vitro, leading to proteasomal degradation of PTEN and nuclear exclusion. XIAP-mediated regulation of Akt phosphorylation is PTEN-dependent.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, siRNA knockdown, XIAP-/- MEFs, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro ubiquitination reconstitution, in vivo Co-IP, KO MEFs with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"19473982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MDM2 physically interacts with the IRES of the XIAP 5'-UTR and positively regulates XIAP IRES-dependent translation. DNA damage and irradiation trigger MDM2 dephosphorylation and cytoplasmic relocalization, increasing IRES-dependent XIAP translation.\",\n      \"method\": \"Co-immunoprecipitation (MDM2-XIAP IRES RNA interaction), IRES reporter assays, MDM2 transfection/localization studies\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein-RNA binding demonstrated, functional IRES reporter validation, cytoplasmic localization linked to function, single lab\",\n      \"pmids\": [\"19411066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"S-nitrosylation of XIAP's RING domain (forming SNO-XIAP) by nitric oxide inhibits XIAP's E3 ubiquitin ligase and anti-apoptotic activity. SNO-caspase transnitrosylates XIAP (transferring NO to XIAP), promoting cell injury. SNO-XIAP was found in brains of Alzheimer's, Parkinson's, and Huntington's disease patients.\",\n      \"method\": \"Biotin-switch assay for S-nitrosylation, E3 ligase activity assays, mass spectrometry, transnitrosylation assay, human brain tissue analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — biochemical reconstitution of S-nitrosylation and transnitrosylation, enzymatic activity assays, human tissue validation, multiple orthogonal methods in single study\",\n      \"pmids\": [\"20670888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"XIAP promotes ubiquitination and degradation of COMMD1 (a copper efflux regulator) via its RING E3 ligase domain, thereby regulating intracellular copper export. Copper directly binds XIAP, causing a conformational change that destabilizes XIAP, reduces steady-state XIAP levels, and abrogates caspase inhibition, linking copper levels to cell death regulation.\",\n      \"method\": \"Ubiquitination assay, protein binding/conformational analysis, copper binding assay, caspase inhibition assay\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct copper binding demonstrated with conformational change, E3 ligase activity toward COMMD1 shown, multiple related methods, single lab review-style paper summarizing experimental findings\",\n      \"pmids\": [\"17382285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"COMMD1's COMM domain is required for interaction with XIAP; two conserved leucine repeats within the COMM domain are critically required for XIAP binding. A COMMD1 mutant unable to bind XIAP shows complete loss of basal ubiquitination and greatly increased protein stability, demonstrating XIAP is the primary E3 ligase controlling COMMD1 expression.\",\n      \"method\": \"GST pulldown, mutagenesis, ubiquitination assay, Western blot\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis defining binding domain combined with in vitro ubiquitination, clean structure-function analysis, single lab\",\n      \"pmids\": [\"18795889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RNA-binding protein HuR directly binds to the XIAP IRES in vitro and in vivo, stimulates IRES-dependent translation of XIAP mRNA, and promotes recruitment of XIAP mRNA into polysomes. HuR-mediated cytoprotection against etoposide requires XIAP.\",\n      \"method\": \"RNA immunoprecipitation, in vitro RNA binding assay, polysome fractionation, XIAP knockdown rescue experiments\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA-protein binding in vitro and in vivo, polysome analysis, epistasis rescue experiment, multiple orthogonal methods\",\n      \"pmids\": [\"21102524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HuR binds to both the 3'-UTR and coding sequence of XIAP mRNA, stabilizing the transcript and elevating XIAP protein levels. Decreasing cellular polyamines increases cytoplasmic HuR and HuR-XIAP mRNA complexes, promoting XIAP mRNA stability and resistance to apoptosis.\",\n      \"method\": \"RNA immunoprecipitation, mRNA stability assay, HuR overexpression/knockdown, polyamine depletion experiments\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA-protein binding demonstrated, mRNA stability assay, single lab with multiple approaches\",\n      \"pmids\": [\"19825980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ARTS (a mitochondrial protein) binds XIAP at BIR1 (distinct from caspase-binding sites) and recruits E3 ligase Siah-1 as an adaptor to induce Siah-1-mediated ubiquitination and degradation of XIAP. Cells lacking either Siah or ARTS contain higher steady-state XIAP levels.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, ARTS-KO and Siah-KO cell analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined binding domain at BIR1, E3 ligase recruitment mechanism, KO cell validation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21185211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"XIAP suppresses autophagy by acting as a previously unidentified E3 ubiquitin ligase for Mdm2, a negative regulator of p53. This XIAP-Mdm2-p53 pathway operates downstream of the PI3K/Akt pathway to control serum starvation-induced autophagy.\",\n      \"method\": \"In vitro ubiquitination assay, epistasis analysis with PI3K/Akt inhibitors, XIAP knockdown/overexpression, autophagy assays, mouse xenograft model\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro ubiquitination reconstitution, epistasis placement in pathway, in vivo tumor model, multiple orthogonal methods\",\n      \"pmids\": [\"23749209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Loss of XIAP or its RING domain leads to TNF-dependent, RIP3-dependent excessive cell death and IL-1β secretion from dendritic cells triggered by TLR stimuli. Loss of XIAP results in aberrantly elevated ubiquitylation of RIP1 outside of TNFR complex I, and RING domain deletion (not just XIAP loss) is sufficient for this phenotype.\",\n      \"method\": \"Gene-targeted mice (XIAP KO and RING domain deletion), TLR stimulation assays, IL-1β ELISA, RIP3/caspase KO epistasis, ubiquitylation analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models (KO and RING deletion), epistasis with RIP3/TNF KOs, defined molecular mechanism for RIP1 ubiquitylation, replicated with multiple orthogonal methods\",\n      \"pmids\": [\"24882010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Selective XIAP antagonism blocks NOD2-mediated inflammatory signaling and cytokine production by disrupting XIAP-RIP2 binding and preventing XIAP-mediated ubiquitination of RIP2. RIP2 kinase activity is dispensable for NOD2 signaling; rather, the conformation of the RIP2 kinase domain regulates binding to XIAP BIR2. Specific lysine residues on RIP2 are required for NOD2 pathway signaling (XIAP ubiquitination sites).\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination site mapping (mass spectrometry), RIP2 kinase inhibitor studies, mutagenesis of RIP2 lysine residues, NF-κB/MAPK activation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (Co-IP, MS-based ubiquitination site mapping, mutagenesis, kinase inhibitor studies), mechanistically rigorous, single comprehensive study\",\n      \"pmids\": [\"29452636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Following TNFα stimulation, XIAP interacts with and ubiquitinates MEKK2, a kinase associated with bi-phasic NF-κB activation, to regulate a second wave of NF-κB activation in an ubiquitin ligase-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, NF-κB reporter assays, XIAP overexpression\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP and ubiquitination assay demonstrated, NF-κB reporter functional validation, single lab, single study\",\n      \"pmids\": [\"18761086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"XIAP is cleaved by caspase-3 and caspase-7 during apoptosis in T lymphocytes, generating a p29 fragment. The p29 fragment retains the ability to bind caspase-3 and -7. Cleavage is inhibited by pan-caspase inhibitor Z-VAD.FMK.\",\n      \"method\": \"In vitro cleavage assay with recombinant caspases, co-immunoprecipitation, cell-based apoptosis assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution with purified caspases, binding retention assay of cleavage product, multiple cell line validation\",\n      \"pmids\": [\"10766165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Full-length XIAP (but not a truncation mutant retaining only caspase-9 inhibition) blocks CD95-mediated mitochondrial cytochrome c and Smac/DIABLO release, loss of mitochondrial membrane potential, and caspase-3 processing, demonstrating that full-length XIAP inhibits caspase activation upstream of mitochondrial amplification of death receptor signals.\",\n      \"method\": \"Stable overexpression of full-length vs. truncation mutant XIAP, cytochrome c release assay, mitochondrial membrane potential assay, RNA interference knockdown\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-dissection approach with matched overexpression constructs, multiple orthogonal readouts of mitochondrial integrity, RNAi confirmation, single lab\",\n      \"pmids\": [\"15282301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"XIAP (via its RING domain E3 ligase activity) directly binds Cdc42 and conjugates poly-ubiquitin chains to lysine-166 of Cdc42, targeting it for proteasomal degradation. XIAP depletion increases Cdc42 protein stability and activity, enhancing filopodia formation in a Cdc42-dependent manner and promoting tumor cell lung colonization.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, mutagenesis (K166 Cdc42), XIAP knockdown, filopodia quantification, in vivo lung colonization assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro ubiquitination with site-specific mutant, Co-IP, KD with defined cellular and in vivo phenotypes, multiple orthogonal methods\",\n      \"pmids\": [\"28661476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ARTS (Sept4_i2) brings XIAP and Bcl-2 into a ternary complex at the outer mitochondrial membrane upon apoptotic induction, allowing XIAP to function as an E3 ligase that ubiquitylates Bcl-2 at lysine-17 for degradation. ARTS binding to Bcl-2 involves the BH3 domain of Bcl-2. Bcl-2 K17A mutant is more stable and more protective against apoptosis. Bcl-2 ubiquitylation is reduced in both XIAP- and Sept4/ARTS-deficient MEFs.\",\n      \"method\": \"Co-immunoprecipitation (ternary complex), in vitro ubiquitination assay, mutagenesis (Bcl-2 K17A, BH3 domain), KO MEFs, cell death assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro ubiquitination reconstitution, site-specific mutagenesis, ternary complex Co-IP, KO cell validation, multiple orthogonal methods in single study\",\n      \"pmids\": [\"29020630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"USP9X is the mitotic deubiquitinase of XIAP; USP9X deubiquitylates and stabilizes XIAP, leading to increased resistance toward mitotic spindle poisons. Knockdown of USP9X or XIAP sensitizes lymphoma cells to spindle poisons and delays lymphoma development in a murine model.\",\n      \"method\": \"Co-immunoprecipitation, deubiquitylation assay, siRNA knockdown, cell viability assays, Eμ-Myc murine lymphoma model\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enzymatic deubiquitylation demonstrated, reciprocal functional validation with KD and in vivo model, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"27317434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP7 deubiquitinates XIAP to inhibit its proteasomal degradation; USP7 inhibition reduces XIAP protein levels and induces caspase-dependent apoptosis. Combinatorial inhibition of USP7 and XIAP enhances apoptosis in vitro and in vivo.\",\n      \"method\": \"Proteomics/GSEA analysis, co-immunoprecipitation, ubiquitination/deubiquitination assay, USP7 modulation (overexpression and inhibition), in vivo tumor xenograft\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct deubiquitination of XIAP demonstrated, in vivo validation, single lab, first report of this interaction\",\n      \"pmids\": [\"36243803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HAX-1 physically interacts with the BIR2 and BIR3 domains of XIAP (confirmed by GST pulldown and surface plasmon resonance); XIAP binds the C-terminal domain of HAX-1. HAX-1 suppresses polyubiquitination of XIAP, enhancing XIAP stability, and the HAX-1-XIAP complex inhibits apoptosis.\",\n      \"method\": \"GST pulldown, surface plasmon resonance, co-immunoprecipitation, polyubiquitination assay, cell viability assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct binding by multiple methods including quantitative SPR, ubiquitination assay, single lab\",\n      \"pmids\": [\"20171186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Siva1 interacts with XIAP via the RING domain of XIAP and N-terminal domains of Siva1; XIAP, Siva1, and TAK1 form a ternary complex. Siva1 inhibits XIAP/TAK1-TAB1-mediated NF-κB activation while enhancing JNK activation, shifting the balance toward apoptosis. XIAP ubiquitin ligase activity mediates Lys-48-linked polyubiquitylation of Siva1.\",\n      \"method\": \"Co-immunoprecipitation (ternary complex), reporter gene assays, Siva1 knockdown, ubiquitination assay (K48 linkage determination)\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ternary complex Co-IP, ubiquitin linkage-specific assay, functional reporter assays, single lab\",\n      \"pmids\": [\"19584092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"XIAP promotes Lys63-linked polyubiquitination of HIF1α in a Ubc13 (E2)-dependent manner, promoting HIF1α nuclear retention and increased expression of HIF1-responsive genes. Inhibition of this pathway reduces nuclear HIF1α, promoter occupancy, and cell viability.\",\n      \"method\": \"Co-immunoprecipitation, Lys63-specific ubiquitin chain assay, Ubc13 depletion, HIF1α nuclear fractionation, HIF target gene expression assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific K63 ubiquitination demonstrated with E2 identity established, functional nuclear retention consequence shown, single lab\",\n      \"pmids\": [\"28666324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"XIAP and cIAP1 induce Beclin 1-dependent autophagy by activating NF-κB signaling through their E3 ubiquitin ligase activity, which leads to direct p65 binding to the Beclin 1 promoter and transcriptional activation. Pharmacological XIAP inhibition in overexpressing B-cell lymphoma lines reduces autophagosome biogenesis.\",\n      \"method\": \"Chromatin immunoprecipitation (p65/Beclin 1 promoter), NF-κB reporter assays, XIAP/cIAP1 overexpression, XIAP inhibitor treatment, autophagy quantification\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct promoter binding, E3 ligase activity required, single lab with multiple methods\",\n      \"pmids\": [\"25669656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"XIAP co-associates with the C-terminus of Patched1 (Ptch1) in primary cilia to inhibit Ptch1-mediated cell death. Inhibition of XIAP suppresses cell proliferation and causes cell death resembling a Hedgehog loss-of-function phenotype, demonstrating that co-ordinated brain and craniofacial development depends on XIAP mediation of Hh/Ptch1-regulated cell survival.\",\n      \"method\": \"Co-immunoprecipitation (XIAP-Ptch1-C), XIAP inhibitor treatment, primary cilia localization studies, cell death assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP and localization demonstrated, pharmacological inhibition phenotype, single lab, single study\",\n      \"pmids\": [\"25292199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"XIAP controls RIPK2 complex formation: XIAP-mediated ubiquitylation of RIPK2 prevents its deposition into detergent-insoluble higher-order speck-like structures; mutation of XIAP ubiquitylation sites on RIPK2 enhances complex formation. RIPK2 autophosphorylation at Y474 and phosphorylation status at S176 influence these structures.\",\n      \"method\": \"Detergent fractionation, RIPK2 mutagenesis (ubiquitylation sites, Y474, S176), bacterial infection model, confocal microscopy\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis combined with fractionation and infection model, single lab\",\n      \"pmids\": [\"31350258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In XIAP-deficient macrophages, extrinsic apoptotic caspase-8 promotes pyroptotic GSDMD processing; combined deletion of apoptotic (caspase-3/-7) and pyroptotic (GSDMD) machinery is required to fully abrogate cell death and bioactive IL-1β release. Caspase-8-driven NLRP3 inflammasome assembly and IL-1β maturation is independent of GSDMD and pannexin-1 channel, distinguishing this from mitochondrial apoptosis-triggered NLRP3 activation.\",\n      \"method\": \"XIAP-deficient patient tissue analysis, macrophage KO (caspase-1/-3/-7/-11, BID, GSDMD/E, pannexin-1) epistasis, caspase activity assays, IL-1β ELISA, cell death quantification\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — comprehensive genetic epistasis with multiple KO combinations, patient tissue validation, multiple orthogonal cell death and inflammatory readouts\",\n      \"pmids\": [\"36647737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"XIAP functions as an E3 ubiquitin ligase for IFT88 (intraflagellar transport protein 88); TGF-β enhances XIAP-mediated ubiquitination and proteasomal degradation of IFT88 in hepatic stellate cells (HSCs), leading to primary cilia loss and HSC activation. Blocking XIAP-mediated IFT88 degradation prevents TGF-β-induced HSC activation and liver fibrosis.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, Ift88-KO mice, XIAP inhibition (genetic and pharmacological), TGF-β stimulation, liver fibrosis model (CCl4)\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro ubiquitination reconstitution, KO mouse model, TGF-β pathway epistasis, in vivo fibrosis rescue, multiple orthogonal methods in single study\",\n      \"pmids\": [\"38351372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"XIAP mediates RIPK2 ubiquitylation and involves a TAB1/RIPK2 complex to induce transcriptional up-regulation and secretion of IL-8 and other chemokines responsible for intra-tumour neutrophil accumulation in melanoma. Alteration of the XIAP-RIPK2-TAB1 axis or neutrophil depletion reduces melanoma growth.\",\n      \"method\": \"In vitro XIAP-RIPK2 ubiquitylation analysis, TAB1/RIPK2 complex analysis, XIAP manipulation in melanoma models, neutrophil depletion, cytokine measurement, mouse melanoma models\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic in vitro and in vivo analyses, mouse models, single lab but multiple approaches\",\n      \"pmids\": [\"35437868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"BIRC4/XIAP protein is present in postsynaptic dendritic spines in unstimulated zebra finch auditory forebrain, where it binds and sequesters active caspase-3. Following song stimuli, caspase-3 activity at postsynaptic sites increases briefly, and caspase-3 activity is required to consolidate a persistent physiological memory trace, suggesting XIAP regulates a non-apoptotic function of caspase-3 in synaptic plasticity.\",\n      \"method\": \"Confocal and immunoelectron microscopy (localization to dendritic spines), pharmacological interference of caspase-3, zenk gene habituation assay\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct subcellular localization by immunoelectron microscopy, pharmacological functional intervention, non-mammalian ortholog in avian brain but consistent protein function\",\n      \"pmids\": [\"17178408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GDF5 and BMP2 stimulate the physical interaction between BMPR2 and XIAP, reducing XIAP ubiquitination and increasing XIAP protein stability, thereby allowing XIAP to bind and inactivate activated caspases and prevent apoptosis in mouse embryonic fibroblasts.\",\n      \"method\": \"Co-immunoprecipitation (BMPR2-XIAP), ubiquitination assay, BMPR2 loss-of-function, apoptosis assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP and ubiquitination assay demonstrated, receptor loss-of-function used, single lab\",\n      \"pmids\": [\"19782107\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"XIAP is a multifunctional protein that directly inhibits caspases-3, -7, and -9 through its BIR2 and BIR3 domains (with the BIR1-BIR2 linker critical for caspase-3 inhibition) and functions as a RING-domain E3 ubiquitin ligase targeting substrates including caspases, PTEN, Bcl-2, COMMD1, Cdc42, Mdm2, HIF1α, IFT88, MEKK2, and Siva1; its anti-apoptotic activity and stability are regulated by post-translational modifications (Akt phosphorylation at Ser87, S-nitrosylation of the RING domain, deubiquitylation by USP9X and USP7), and XIAP mediates innate immune signaling by binding RIP2 via BIR2 to facilitate NOD1/2-dependent NF-κB activation, discriminates type I from type II FAS-induced apoptosis by imposing a brake on effector caspases in type II cells, and controls necroptosis by regulating RIP1/RIP3-dependent death pathways.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"XIAP is a bifunctional anti-apoptotic protein that combines direct caspase inhibition with RING-domain E3 ubiquitin ligase activity to control cell death, innate immune signaling, and cell-fate decisions [#0, #5]. Its tandem BIR domains engage the apoptotic machinery: the BIR1-BIR2 linker binds the caspase-3 active site while the BIR domain contacts an adjacent enzyme surface [#0], and full-length XIAP, but not caspase-9-inhibiting truncations, blocks death-receptor signaling upstream of mitochondrial cytochrome c and Smac release [#21]. XIAP is the molecular discriminator between type I and type II FAS apoptosis, imposing a brake on effector caspases that renders type II cells dependent on mitochondrial amplification [#7]. Its C-terminal RING domain functions as an E3 ligase that ubiquitinates a broad substrate set—including PTEN, COMMD1, Cdc42, Bcl-2, Mdm2, Siva1, HIF1\\u03b1, and IFT88—linking XIAP to PTEN/Akt survival signaling, copper homeostasis, cytoskeletal regulation, autophagy, and ciliary biology [#8, #12, #22, #23, #16, #28, #33]. RING-dependent auto-ubiquitination also sets XIAP's own abundance, and the RING domain is required for full caspase inhibition in vivo [#5]. Beyond apoptosis, XIAP nucleates NF-\\u03baB signaling: its BIR1 domain dimerizes and binds TAB1 to activate TAK1/NF-\\u03baB [#4], while its BIR2 domain binds and ubiquitinates RIP2 to drive NOD1/2 innate immune responses [#6, #18]. XIAP further restrains necroptotic and inflammatory death by regulating RIP1/RIP3- and RIPK2-dependent pathways, with its loss causing TNF/RIP3-dependent excessive cell death and caspase-8-driven inflammasome activation [#17, #32]. XIAP stability is tuned by Akt phosphorylation at Ser87 [#3], RING S-nitrosylation [#10], ARTS/Siah-1-mediated degradation [#15], and deubiquitylation by USP9X and USP7 [#24, #25], while its translation is controlled through IRES-dependent mechanisms involving MDM2 and HuR [#9, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established the structural and residue-level basis for how XIAP inhibits caspase-3, defining the BIR2 domain fold and the linker region that engages the protease active site.\",\n      \"evidence\": \"NMR structure of the BIR2 domain with site-directed mutagenesis\",\n      \"pmids\": [\"10548111\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the BIR3-caspase-9 interaction\", \"Mechanism of RING-domain E3 activity not addressed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Tested whether XIAP is essential for apoptosis suppression in vivo, revealing functional redundancy through compensatory upregulation of c-IAP1/2.\",\n      \"evidence\": \"XIAP knockout mouse with histopathology and Western blot\",\n      \"pmids\": [\"11313486\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redundancy obscures cell-type-specific XIAP roles\", \"Non-apoptotic functions not examined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Distinguished caspase-9- versus effector-caspase-directed XIAP activity, showing full-length XIAP blocks death-receptor signaling upstream of mitochondrial amplification.\",\n      \"evidence\": \"Domain-dissection overexpression with cytochrome c release and mitochondrial potential assays\",\n      \"pmids\": [\"15282301\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish which caspase step is rate-limiting in physiological context\", \"Single-lab overexpression system\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the structural basis by which XIAP activates NF-\\u03baB, showing BIR1 dimerization and TAB1 binding drive TAK1/NF-\\u03baB signaling independent of caspase inhibition.\",\n      \"evidence\": \"Crystal structure of BIR1-TAB1 complex with mutagenesis and NF-\\u03baB reporters\",\n      \"pmids\": [\"17560374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological stimuli triggering this axis not fully mapped\", \"Relationship to RIP2 signaling not addressed here\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated that the RING domain governs XIAP protein stability and is required for full caspase inhibition in vivo, revealing a paradoxical pro-apoptotic effect of BIR-only protein.\",\n      \"evidence\": \"RING-deletion knock-in mice with caspase-3 activity and lymphoma models\",\n      \"pmids\": [\"18708583\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate(s) accounting for in vivo phenotype not identified here\", \"Mechanism linking stability to caspase inhibition incomplete\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified XIAP as the discriminator between type I and type II FAS apoptosis, defining its role as an effector-caspase brake requiring mitochondrial amplification in type II cells.\",\n      \"evidence\": \"XIAP and BID knockout mice with genetic epistasis and SMAC mimetic\",\n      \"pmids\": [\"19626005\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular determinant of type I vs II identity beyond XIAP threshold unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Connected XIAP to innate immunity by showing BIR2-RIP2 binding is required for NOD1/2-dependent NF-\\u03baB activation.\",\n      \"evidence\": \"Reciprocal Co-IP and NF-\\u03baB reporters in XIAP-deficient cells\",\n      \"pmids\": [\"19667203\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin linkage on RIP2 not yet defined at this stage\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Expanded XIAP's E3 ligase substrate repertoire to PTEN, linking XIAP to Akt survival signaling via PTEN degradation and nuclear exclusion.\",\n      \"evidence\": \"In vitro ubiquitination, Co-IP, and XIAP-/- MEFs\",\n      \"pmids\": [\"19473982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single-lab data\", \"In vivo physiological relevance of PTEN regulation not established\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established XIAP as the primary E3 ligase controlling COMMD1 abundance, mapping the COMM domain leucine repeats required for binding.\",\n      \"evidence\": \"GST pulldown, mutagenesis, and ubiquitination assay\",\n      \"pmids\": [\"18795889\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological copper-handling consequence not directly tested here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined post-translational and translational control of XIAP: S-nitrosylation inactivates the RING, and IRES-dependent translation is regulated by MDM2 and HuR.\",\n      \"evidence\": \"Biotin-switch assays, IRES reporters, RNA-protein binding, polysome fractionation\",\n      \"pmids\": [\"20670888\", \"19411066\", \"21102524\", \"19825980\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Integration of these regulatory layers in single cells not resolved\", \"Some findings single-lab and Medium confidence\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified the ARTS/Siah-1 axis as a dedicated route for XIAP degradation through BIR1 binding distinct from caspase sites.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, ARTS-KO and Siah-KO cells\",\n      \"pmids\": [\"21185211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conditions selecting this pathway over auto-ubiquitination unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed XIAP, via its RING domain, restrains TNF/RIP3-dependent inflammatory cell death and aberrant RIP1 ubiquitylation in dendritic cells.\",\n      \"evidence\": \"XIAP KO and RING-deletion mice with RIP3/caspase epistasis and IL-1\\u03b2 ELISA\",\n      \"pmids\": [\"24882010\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct enzymatic relationship between XIAP and RIP1 not fully defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Broadened XIAP substrate diversity to Cdc42, HIF1\\u03b1, and Bcl-2, linking it to cytoskeletal dynamics, hypoxic gene expression, and mitochondrial apoptosis via distinct ubiquitin linkages.\",\n      \"evidence\": \"In vitro ubiquitination with site-specific mutants, ternary-complex Co-IP, KO MEFs and in vivo assays\",\n      \"pmids\": [\"28661476\", \"28666324\", \"29020630\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate selectivity determinants among many targets unresolved\", \"Some axes Medium confidence\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Mechanistically refined NOD2 signaling, showing RIP2 kinase activity is dispensable while its conformation governs XIAP BIR2 binding and lysine-specific ubiquitination drives the pathway.\",\n      \"evidence\": \"Co-IP, MS ubiquitination-site mapping, RIP2 mutagenesis and kinase inhibitors\",\n      \"pmids\": [\"29452636\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream E2 and chain architecture not fully detailed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed that in XIAP deficiency, caspase-8 drives pyroptotic GSDMD processing and GSDMD-independent NLRP3/IL-1\\u03b2 activation, explaining the inflammatory phenotype of XIAP loss.\",\n      \"evidence\": \"Patient tissue plus multi-KO macrophage epistasis and IL-1\\u03b2 readouts\",\n      \"pmids\": [\"36647737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct XIAP substrate restraining caspase-8 not pinpointed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended XIAP E3 activity to ciliary biology, showing TGF-\\u03b2-driven XIAP ubiquitination of IFT88 causes cilia loss and hepatic stellate cell activation in fibrosis.\",\n      \"evidence\": \"In vitro ubiquitination, Ift88-KO mice, and CCl4 liver fibrosis model\",\n      \"pmids\": [\"38351372\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalizability to other ciliated tissues not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How XIAP achieves selectivity among its many E3 substrates and how its caspase-inhibitory, NF-\\u03baB-activating, and ligase functions are coordinated within a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model of substrate choice\", \"Spatiotemporal partitioning of XIAP functions undefined\", \"Mendelian disease link not directly established within this corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 20, 21]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [5, 8, 12, 22, 23, 28, 33]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 7, 21]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [8, 22, 28]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9, 14]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [30, 33]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 7, 21, 17, 32]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 18, 31, 32]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 19, 27]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [16, 29]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 8, 12, 22, 23, 33]}\n    ],\n    \"complexes\": [\n      \"XIAP-RIP2 (NOD signaling)\",\n      \"XIAP-TAB1-TAK1\",\n      \"ARTS-XIAP-Bcl-2 ternary complex\",\n      \"XIAP-Siva1-TAK1 ternary complex\"\n    ],\n    \"partners\": [\n      \"RIP2\",\n      \"TAB1\",\n      \"PTEN\",\n      \"COMMD1\",\n      \"Cdc42\",\n      \"Bcl-2\",\n      \"USP9X\",\n      \"USP7\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}