{"gene":"TIRAP","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2001,"finding":"TIRAP (TIR domain-containing adapter protein) was identified as an adaptor protein that controls activation of MyD88-independent signaling pathways downstream of TLR4, and PKR was identified as a component of both TIRAP- and MyD88-dependent signaling pathways.","method":"Cloning, overexpression, reporter assays, co-immunoprecipitation","journal":"Nature immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, co-IP and reporter assays; foundational identification paper","pmids":["11526399"],"is_preprint":false},{"year":2002,"finding":"TIRAP is essential for the MyD88-dependent signaling pathway shared by TLR2 and TLR4 (not TLR3, TLR7, or TLR9); TIRAP-deficient mice show abolished LPS-induced splenocyte proliferation, cytokine production, and delayed NF-κB/MAPK activation, but intact MyD88-independent responses (IFN-inducible genes, DC maturation).","method":"TIRAP knockout mouse generation, LPS/TLR ligand stimulation, NF-κB/MAPK assays, cytokine measurement","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple orthogonal readouts, replicated by two independent labs in same issue","pmids":["12447441","12447442"],"is_preprint":false},{"year":2002,"finding":"TIRAP-deficient mice respond normally to TLR5, TLR7, and TLR9 ligands and to IL-1 and IL-18, but have defects in cytokine production and NF-κB/MAPK activation in response to TLR4 ligand LPS and TLR2, TLR1, and TLR6 ligands, demonstrating TIRAP provides signaling specificity for a subset of TLRs.","method":"Tirap gene knockout mice, cytokine ELISA, NF-κB/MAPK activation assays, TLR ligand stimulation panel","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with comprehensive TLR ligand panel, independent replication in same journal issue","pmids":["12447442"],"is_preprint":false},{"year":2002,"finding":"TIRAP is required for LPS-induced NF-κB activation and apoptosis in human endothelial cells, as demonstrated using a TIRAP dominant-negative construct, identifying a role for TIRAP in endothelial cell signaling.","method":"Dominant-negative TIRAP construct overexpression, NF-κB reporter assay, apoptosis assay in human endothelial cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single lab, dominant-negative approach only","pmids":["12083783"],"is_preprint":false},{"year":2002,"finding":"TIRAP/MAL is required for LPS-induced IRF-3 activation (but not dsRNA-induced IRF-3 activation), placing TIRAP in the pathway leading to IFN gene induction by TLR4 but not by TLR3.","method":"TIRAP overexpression, dominant-negative constructs, IRF-3 reporter assays in cell lines","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single lab, overexpression/DN approach without genetic KO confirmation","pmids":["12062447"],"is_preprint":false},{"year":2003,"finding":"In primary human fibroblasts and endothelial cells, both MyD88 and TIRAP are essential for LPS-induced IκBα phosphorylation, NF-κB activation, and IL-6/IL-8 production via IKK2; however, in macrophages, neither MyD88 nor TIRAP nor IKK2 are required for NF-κB activation or TNFα/IL-6/IL-8 production, though TIRAP is involved in IFNβ production.","method":"Dominant-negative overexpression of MyD88/TIRAP in primary human cells (fibroblasts, endothelial cells, macrophages), NF-κB reporter, cytokine ELISA, TLR4 neutralization","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (DN constructs + cytokine ELISAs + TLR neutralization) in primary human cells, single lab","pmids":["14630816"],"is_preprint":false},{"year":2006,"finding":"PKCδ binds directly to TIRAP/Mal through the TIR domain of TIRAP; PKCδ binding promotes TLR2- and TLR4-mediated phosphorylation of p38 MAPK, IKK, and IκBα in macrophages.","method":"GST pulldown, co-immunoprecipitation from macrophage lysates, TIRAP truncation mutants, PKCδ depletion (siRNA/knockdown) with signaling readouts","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pulldown plus co-IP from endogenous macrophage lysates plus domain mapping, single lab","pmids":["17161867"],"is_preprint":false},{"year":2009,"finding":"TIRAP directly interacts with TRAF6 in response to TLR2 and TLR4 stimulation; this interaction is not membrane-dependent. A TIRAP E190A mutation in the TRAF6-binding motif abolishes TRAF6 interaction, fails to reconstitute proinflammatory responses in Mal-deficient macrophages, and blocks Ser phosphorylation of the NF-κB p65 subunit (controlling transcriptional activation but not nuclear translocation).","method":"Co-immunoprecipitation, site-directed mutagenesis (E190A), reconstitution of Mal-deficient macrophages, NF-κB reporter, cytokine assays, p65 phosphorylation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus mutagenesis plus functional reconstitution with defined phenotypic readouts, single lab with multiple orthogonal methods","pmids":["19592497"],"is_preprint":false},{"year":2009,"finding":"A naturally occurring TIRAP variant D96N (Mal D96N, rs8177400) is inactive in NF-κB reporter assays, fails to interact with MyD88 by co-immunoprecipitation, and acts as a hypomorphic allele with impaired cytokine production upon TLR2/4 stimulation, demonstrating D96 resides in the MyD88-binding interface.","method":"Overexpression in reporter cell lines, co-immunoprecipitation, cytokine assays (LPS, PAM2CSK4), computer modeling","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional reporter assays plus cytokine readouts in multiple cell types, single lab","pmids":["19509286"],"is_preprint":false},{"year":2009,"finding":"Brucella TIR domain-containing protein TcpB mimics TIRAP by interacting with phosphoinositides through its N-terminal domain and colocalizing with the plasma membrane and cytoskeleton, blocking TIRAP-induced NF-κB activation; this supports a model where TIRAP uses phosphoinositide binding for membrane targeting.","method":"Sequence analysis, phosphoinositide binding assays, co-localization microscopy, NF-κB reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple methods (lipid binding, co-localization, reporter) but focused on bacterial mimic, indirect evidence for TIRAP mechanism","pmids":["19196716"],"is_preprint":false},{"year":2009,"finding":"TIRAP requirement for TLR2 signaling can be overcome when Francisella tularensis (Ft) is retained within the phagosome or when higher concentrations of TLR2 agonists are used, revealing TIRAP's function as a 'bridging' adaptor that can be bypassed by enhanced or sustained TLR2-agonist contact from endosomal compartments. MyD88 remains absolutely required.","method":"TIRAP-deficient macrophages, bacterial infection, BFA-mediated phagosome acidification inhibition, TLR2 agonist dose-response, NF-κB reporter and cytokine assays","journal":"Journal of leukocyte biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO macrophages with multiple experimental manipulations, single lab","pmids":["19889726"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of the MAL/TIRAP TIR domain was determined; it reveals a unique fold with a long loop replacing a β-strand found in other TIR domains, placing the 'BB loop' proline motif in a unique surface position. Site-directed mutants confirmed key dimerization and MyD88-interacting interface residues by co-immunoprecipitation.","method":"X-ray crystallography, site-directed mutagenesis, co-immunoprecipitation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and co-IP functional validation","pmids":["21873236"],"is_preprint":false},{"year":2011,"finding":"TIRAP and MyD88 bind to the cytoplasmic domain of RAGE after PKCζ-mediated phosphorylation at Ser391, transducing intracellular signals from ligand-activated RAGE; blocking TIRAP and MyD88 function largely abrogated RAGE intracellular signaling.","method":"Co-immunoprecipitation, kinase assays, dominant-negative inhibition, phospho-specific assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with phospho-RAGE plus functional DN inhibition, single lab","pmids":["21829704"],"is_preprint":false},{"year":2013,"finding":"Crystal structures of both the Brucella TcpB TIR domain and the human TIRAP TIR domain were determined. The TIRAP TIR domain crystal structure reveals a unique N-terminal TIR fold containing a disulfide bond (Cys89–Cys134). Substantial conformational differences in the BB loop region exist between TcpB and TIRAP. TcpB–TIRAP interaction was validated by co-immunoprecipitation and NF-κB reporter assays.","method":"X-ray crystallography, hydrogen/deuterium exchange mass spectrometry, co-immunoprecipitation, NF-κB reporter assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with HDX-MS validation and functional co-IP in one study","pmids":["24275656"],"is_preprint":false},{"year":2013,"finding":"PIP5Kα (phosphatidylinositol 4-phosphate 5-kinase α) colocalized and interacted with TIRAP at the cell surface; kinase-dead PIP5Kα rendered TIRAP soluble and disrupted its membrane targeting. LPS induced bi-directional TIRAP translocation between membrane and cytosol correlating with PIP2 levels. PIP5Kα-generated PIP2 is required for TIRAP plasma membrane recruitment necessary for TLR4 signaling.","method":"shRNA/siRNA knockdown, co-localization microscopy, co-immunoprecipitation, kinase-dead mutant complementation, PIP2 measurement, cytokine assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (KD + co-IP + imaging + functional readouts), single lab","pmids":["23297396"],"is_preprint":false},{"year":2013,"finding":"In a gastric tumourigenesis model, genetic ablation of Mal/TIRAP in gp130F/F mice did not reduce tumour burden (unlike MyD88 deletion), demonstrating that Mal is dispensable for TLR2-promoted gastric tumour growth whereas MyD88 is required, revealing a differential (Mal-independent) requirement for MyD88 downstream of TLR2 in this context.","method":"Genetic ablation (Mal-/- crossed into gp130F/F), tumour burden quantification, apoptosis and proliferation assays, gene expression analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic KO with defined phenotypic readouts, single lab","pmids":["23728346"],"is_preprint":false},{"year":2015,"finding":"A TLR2 TIR-derived D-helix peptide (2R9) preferentially targets TIRAP as demonstrated by cell imaging, co-immunoprecipitation, and in vitro binding studies; 2R9 inhibits TIRAP recruitment to TLRs and suppresses TLR2-, TLR4-, TLR7-, and TLR9- (but not TLR3-) mediated cytokine production in vitro and in vivo, and significantly improved survival in influenza-infected mice.","method":"Cell-permeable peptide library screening, co-immunoprecipitation, cell imaging, in vitro binding, in vivo murine influenza model","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (co-IP + imaging + in vitro binding + in vivo efficacy), single lab with rigorous controls","pmids":["26095366"],"is_preprint":false},{"year":2017,"finding":"The solution NMR structure of reduced MAL/TIRAP TIR domain reveals a structural rearrangement compared to the crystal (disulfide-bonded) structure, including relocation of a β-strand and repositioning of the BB loop to a more typical TIR domain position. Under oxidizing conditions, C91 undergoes glutathionylation (detected by mass spectrometry in LPS-activated macrophages). The C91A mutation limits glutathionylation, acts as a dominant negative blocking MAL–MyD88 interaction, and diminishes TIRAP degradation and IRAK4 interaction; H92P mimics C91A effects.","method":"NMR structure determination, mass spectrometry, site-directed mutagenesis (C91A, H92P), co-immunoprecipitation, redox NMR, dominant-negative functional assays in macrophages","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure plus mass spectrometry plus mutagenesis plus functional co-IP, multiple orthogonal methods in single study","pmids":["28739909"],"is_preprint":false},{"year":2017,"finding":"TIRAP PBM (phosphoinositide-binding motif) transitions from disordered to helical conformation upon binding phosphoinositides via basic and nonpolar residues. Phosphorylation at Thr28 within the PBM distorts its helical structure, reducing PI interactions and cell membrane targeting, and leads to TIRAP ubiquitination and degradation, serving as a negative regulatory mechanism to terminate innate immune responses.","method":"NMR spectroscopy, phosphoinositide binding assays, mutagenesis, cell membrane targeting assays, ubiquitination assays","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structural analysis combined with functional phosphoinositide binding, mutagenesis, and ubiquitination assays in one study","pmids":["28225045"],"is_preprint":false},{"year":2017,"finding":"CLIP170 (cytoplasmic linker protein 170) interacts with TIRAP and induces ubiquitination and subsequent proteasomal degradation of TIRAP to negatively regulate TLR4-mediated proinflammatory responses; CLIP170 overexpression suppresses LPS-induced IL-6/TNFα, and CLIP170 silencing potentiates them in vitro and in vivo.","method":"Co-immunoprecipitation, ubiquitination assays, CLIP170 overexpression/siRNA knockdown, in vivo siRNA silencing in C57BL/6 mice, cytokine assays","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assays plus gain/loss-of-function both in vitro and in vivo, single lab","pmids":["29222167"],"is_preprint":false},{"year":2017,"finding":"Src family kinase (SFK) activation induces tyrosine phosphorylation of TLR4 and dissociates MyD88 and Mal/TIRAP from TLR4, inhibiting LPS-induced NF-κB and JNK1/2 activation. Kinase-active SFK-Lyn strongly binds TLR4 and promotes its phosphorylation, whereas kinase-dead SFK-Lyn has reduced binding and does not phosphorylate TLR4, suggesting a negative feedback loop.","method":"Chemical rescue approach for SFK activation, co-immunoprecipitation of TLR4 with MyD88/TIRAP, kinase-dead and constitutively active Lyn mutants, NF-κB/JNK assays, cytokine measurements","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with gain/loss-of-function kinase mutants and functional signaling readouts, single lab","pmids":["29175418"],"is_preprint":false},{"year":2018,"finding":"BRET studies confirmed that TIRAP is necessary for MyD88 interaction with TLR2; TLR2–TIRAP interaction was detected by BRET, and TLR2–MyD88 interaction only occurred in the presence of TIRAP. However, co-immunoprecipitation studies did not demonstrate constitutive interaction between these proteins, suggesting some BRET signals were artefacts of protein overexpression.","method":"BRET (bioluminescence resonance energy transfer), co-immunoprecipitation, confocal microscopy","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — BRET result partially contradicted by co-IP; authors explicitly note overexpression artefacts; single lab","pmids":["30138457"],"is_preprint":false},{"year":2019,"finding":"TIRAP forms a signaling complex with c-Jun protein in macrophages in response to LPS stimulation, increasing AP-1 transcriptional activity and amplifying expression of inflammatory mediators; gefitinib was identified as an inhibitor of this TIRAP–c-Jun interaction, disrupting it in vitro and in a mouse sepsis model.","method":"Co-immunoprecipitation, AP-1 reporter assay, molecular docking, in vitro inhibitor assay, murine LPS sepsis model","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus functional reporter plus in vivo validation, single lab","pmids":["30909134"],"is_preprint":false},{"year":2020,"finding":"TIRAP expression is induced in T cells by TCR stimulation and sustained by IL-2 signals via mTORC1 activation. TIRAP is required for TLR2-mediated NF-κB and ERK activation and IFN-γ production in effector T cells. Additionally, TLR2 stimulation induces mTORC1 activation through TIRAP, creating a positive feedback loop.","method":"T cell differentiation assays, mTORC1 inhibition (rapamycin), TIRAP overexpression/knockdown, NF-κB/ERK reporter assays, cytokine ELISA, IL-2 dose-response","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (KD + OE + pharmacological inhibition + genetic readouts), single lab","pmids":["32698010"],"is_preprint":false},{"year":2022,"finding":"TIRAP drives myelosuppression through an IFNγ-HMGB1 axis: TIRAP overexpression upregulates IFNγ, which via IFNγR-mediated HMGB1 release disrupts the bone marrow endothelial niche and suppresses all three major hematopoietic lineages. IFNγ deletion blocks HMGB1 release, reverses the endothelial defect, and restores myelopoiesis. This function is independent of T cells or pyroptosis.","method":"TIRAP overexpression in mouse model, IFNγ genetic deletion, HMGB1 measurement, bone marrow endothelial niche analysis, hematopoietic lineage profiling","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (IFNγ KO rescues TIRAP phenotype) with multiple orthogonal readouts (HMGB1 assay, endothelial niche, hematopoietic profiling), single lab with rigorous controls","pmids":["35089323"],"is_preprint":false},{"year":2022,"finding":"TIRAP is positively required for TLR8-mediated signaling in human macrophages: TIRAP is recruited to the TLR8 Myddosome signaling complex and contributes to Akt kinase activation and nuclear translocation of IRF5, promoting IFNβ, IL-12p70, and TNF expression following TLR8 stimulation.","method":"TIRAP gene silencing (siRNA) in primary human monocyte-derived macrophages, cytokine qPCR/Bioplex, immunofluorescence, cell fractionation/immunoblotting, immunoprecipitation, Akt inhibitors","journal":"Biomedicines","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (KD + co-IP + imaging + kinase inhibition), single lab, primary human cells","pmids":["35884781"],"is_preprint":false},{"year":2022,"finding":"TIRAP facilitates the direct recruitment of TRAF6 to the plasma membrane for NF-κB transactivation and controls TLR4 downstream signaling through TPL2; upon S100A8/A9 binding to TLR4, TIRAP enhances TPL2 activation leading to MAPK cascade activation promoting bladder cancer cell growth, migration, and invasion.","method":"Co-immunoprecipitation, siRNA knockdown, MAPK signaling assays, in vivo TLR4 inhibition, cancer cell phenotypic assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus KD plus in vivo inhibition with functional readouts, single lab","pmids":["36240653"],"is_preprint":false},{"year":2023,"finding":"TIRAP expression is induced by Mycobacterium tuberculosis (Mtb) infection in macrophages, where it prevents phagosomal acidification and rupture, enabling intracellular bacterial replication. TIRAP-deficient macrophages restrict Mtb replication, and TIRAP heterozygous mice are more resistant to Mtb. This anti-phagosomal acidification effect occurs through a Cish-dependent signaling pathway.","method":"TIRAP KO and heterozygous mouse infection models, ex vivo macrophage infection, phagosomal acidification assays, bacterial CFU counting, Cish-dependent pathway analysis","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic models (KO, heterozygous) with defined cellular phenotype (phagosomal acidification) plus pathway identification (Cish), single lab with multiple orthogonal approaches","pmids":["36888688"],"is_preprint":false},{"year":2023,"finding":"ALKBH5-mediated m6A demethylation of TIRAP mRNA stabilizes TIRAP mRNA in hepatic stellate cells upon irradiation, activating NF-κB and JNK/Smad2 pathways downstream of TIRAP to promote hepatic stellate cell activation and radiation-induced liver fibrosis.","method":"MeRIP-seq, RNA-seq, ALKBH5 knockdown/overexpression in HSC, NF-κB/JNK/Smad2 pathway assays, m6A immunoprecipitation","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MeRIP-seq plus functional KD/OE with defined pathway readouts, single lab","pmids":["36792369"],"is_preprint":false},{"year":2024,"finding":"The small molecule o-vanillin forms a covalent bond with Lys210 of MAL/TIRAP TIR domain (confirmed by NMR) and inhibits MAL higher-order assembly in vitro; however, o-vanillin inhibits TLR2 but not TLR4 signaling in mouse and human cells independently of MAL, suggesting it covalently modifies TLR2 signaling complexes directly.","method":"NMR spectroscopy (covalent bond identification), in vitro higher-order assembly assay, cell-based TLR2/TLR4 signaling assays in mouse and human cells","journal":"Journal of enzyme inhibition and medicinal chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural confirmation of covalent bond plus in vitro assembly inhibition plus cell-based functional validation, single lab","pmids":["38416868"],"is_preprint":false},{"year":2024,"finding":"CLIP1 (TIRAP ubiquitin ligase) ubiquitinates TIRAP and promotes its degradation to negatively regulate TLR4/NF-κB signaling; TFPI2 inhibits CLIP1 activity (via R24 of TFPI2 KD1 domain interaction with CLIP1) to prevent TIRAP degradation and amplify inflammatory responses. HOPE (hypothermic oxygenated perfusion) reduces TFPI2 expression, thereby permitting CLIP1-mediated TIRAP ubiquitination and dampening liver ischemia-reperfusion injury.","method":"Co-immunoprecipitation, ubiquitination assays, CLIP1/TFPI2 overexpression/knockdown, rat fatty liver IRI model, NF-κB signaling assays","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assays plus in vivo model, single lab with multiple orthogonal approaches","pmids":["39617791"],"is_preprint":false}],"current_model":"TIRAP/MAL is a plasma membrane-localized TIR domain-containing adaptor protein that bridges MyD88 to TLR2 and TLR4 (and contributes to TLR7, TLR8, and TLR9 signaling) by binding PIP2 through its phosphoinositide-binding motif; upon TLR activation, TIRAP recruits TRAF6 and the PKCδ–p38 MAPK complex to orchestrate NF-κB transactivation and MAPK activation, while its activity is terminated by glutathionylation at Cys91 (promoting MyD88 binding), TIRAP ubiquitination/degradation triggered by Thr28 phosphorylation and CLIP170/CLIP1-mediated ubiquitination, and by SFK-induced TLR4 tyrosine phosphorylation that dissociates TIRAP from the receptor complex. Beyond canonical TLR signaling, TIRAP also transduces signals from RAGE (via PKCζ-phosphorylated Ser391), forms a complex with c-Jun to activate AP-1, and noncanonically drives IFNγ-HMGB1-mediated bone marrow suppression."},"narrative":{"mechanistic_narrative":"TIRAP/MAL is a TIR domain-containing adaptor that provides receptor-proximal specificity to a subset of Toll-like receptor signaling pathways, bridging activated TLR2 and TLR4 to the downstream adaptor MyD88 to drive NF-κB and MAPK activation [PMID:12447441, PMID:12447442]. Genetic ablation in mice abolishes LPS- and TLR2-ligand-induced cytokine production and NF-κB/MAPK activation while leaving TLR3, TLR5, TLR7, TLR9, IL-1, and IL-18 responses intact, defining TIRAP as a selective adaptor rather than a universal one [PMID:12447442]. TIRAP is targeted to the plasma membrane through a phosphoinositide-binding motif (PBM) that binds PIP2 generated by PIP5Kα, positioning it at the receptor for signal initiation [PMID:23297396, PMID:28225045]. From the membrane it directly recruits TRAF6 via a TRAF6-binding motif (E190) to control transcriptional activation through serine phosphorylation of NF-κB p65, and it engages the PKCδ complex to promote p38, IKK, and IκBα phosphorylation [PMID:17161867, PMID:19592497]. Structural studies of the MAL TIR domain reveal a distinctive fold with a redox-sensitive cysteine (C91): glutathionylation under oxidizing conditions promotes MyD88 binding and IRAK4 engagement, coupling TIRAP function to cellular redox state [PMID:21873236, PMID:28739909]. TIRAP activity is terminated by several converging negative-regulatory mechanisms—Thr28 phosphorylation within the PBM that disrupts membrane binding and triggers ubiquitination/degradation, CLIP170- and CLIP1-mediated ubiquitination and proteasomal degradation, and Src-family-kinase-induced TLR4 tyrosine phosphorylation that dissociates the adaptor from the receptor [PMID:28225045, PMID:29222167, PMID:29175418, PMID:39617791]. Beyond canonical TLR signaling TIRAP transduces RAGE signals after PKCζ-mediated Ser391 phosphorylation, forms a complex with c-Jun to amplify AP-1 activity, contributes to TLR8 Myddosome signaling, and drives non-canonical IFNγ–HMGB1-mediated bone marrow suppression [PMID:21829704, PMID:30909134, PMID:35089323, PMID:35884781].","teleology":[{"year":2001,"claim":"Established TIRAP as a candidate TLR4 adaptor, raising the question of how it relates to MyD88-dependent versus -independent signaling.","evidence":"Cloning with overexpression, reporter, and co-IP assays identifying TIRAP and PKR in TLR4 pathways","pmids":["11526399"],"confidence":"Medium","gaps":["Overexpression-based; genetic requirement and receptor specificity unresolved","Initial assignment to MyD88-independent pathway later refined by knockout studies"]},{"year":2002,"claim":"Genetic knockouts settled the question of which TLRs require TIRAP, establishing it as a specificity-conferring adaptor for the MyD88-dependent arm of TLR2 and TLR4 but not TLR3/5/7/9 or IL-1/IL-18.","evidence":"TIRAP-deficient mice with TLR ligand panel, NF-κB/MAPK assays, and cytokine readouts","pmids":["12447441","12447442"],"confidence":"High","gaps":["Molecular basis of receptor selectivity not defined","Cell-type-dependent requirements (e.g., macrophage vs fibroblast) not yet resolved"]},{"year":2003,"claim":"Showed cell-type-dependent adaptor requirements, indicating TIRAP/MyD88 are essential in some primary human cells but bypassable in macrophages.","evidence":"Dominant-negative MyD88/TIRAP in primary human fibroblasts, endothelial cells, and macrophages with cytokine and reporter readouts","pmids":["14630816"],"confidence":"Medium","gaps":["Dominant-negative approach without genetic confirmation","Mechanism of macrophage-specific bypass unexplained"]},{"year":2006,"claim":"Identified a direct effector partner, answering how TIRAP couples to MAPK/IKK signaling via PKCδ binding through the TIR domain.","evidence":"GST pulldown, co-IP from macrophage lysates, TIRAP truncation mapping, PKCδ knockdown with signaling readouts","pmids":["17161867"],"confidence":"Medium","gaps":["Single lab","Stoichiometry and ordering relative to MyD88 recruitment unclear"]},{"year":2009,"claim":"Defined how TIRAP triggers NF-κB transcriptional output by directly recruiting TRAF6 via a defined binding motif, and mapped the MyD88-interaction interface through a natural hypomorphic variant.","evidence":"Reciprocal co-IP, E190A and D96N mutagenesis, reconstitution of Mal-deficient macrophages, p65 phosphorylation and cytokine assays","pmids":["19592497","19509286"],"confidence":"High","gaps":["Separation of TRAF6-dependent transcriptional activation from nuclear translocation needs structural detail","In vivo consequences of D96N variant not fully defined"]},{"year":2009,"claim":"Established the membrane-targeting logic of TIRAP through phosphoinositide binding, supported by a bacterial mimic, and defined it as a bridging adaptor bypassable under high-agonist or endosomal conditions.","evidence":"Brucella TcpB phosphoinositide binding and colocalization studies, plus TIRAP-deficient macrophages with phagosome/agonist manipulations","pmids":["19196716","19889726"],"confidence":"Medium","gaps":["Direct PIP species and residues mediating TIRAP membrane binding not yet mapped","Mechanism of bridging-adaptor bypass at the receptor level unresolved"]},{"year":2011,"claim":"Determined the TIRAP TIR domain structure, revealing a unique fold and identifying dimerization and MyD88-interacting surface residues, and showed TIRAP also engages RAGE downstream of PKCζ.","evidence":"X-ray crystallography with mutagenesis/co-IP validation; co-IP and kinase assays linking TIRAP/MyD88 to phospho-Ser391 RAGE","pmids":["21873236","21829704"],"confidence":"High","gaps":["Structure of full TIRAP signalosome with MyD88/TLR not resolved","RAGE-TIRAP coupling shown by DN inhibition only"]},{"year":2013,"claim":"Connected membrane recruitment to enzymatic PIP2 production via PIP5Kα and provided crystallographic evidence of a disulfide-bonded TIR fold, while genetic studies revealed Mal-independent MyD88 functions in some tumor contexts.","evidence":"PIP5Kα knockdown/co-IP/imaging with PIP2 measurement; TIRAP crystal structure with HDX-MS; Mal-/- gp130F/F gastric tumor model","pmids":["23297396","24275656","23728346"],"confidence":"High","gaps":["Functional relevance of crystallographic disulfide vs solution state not yet reconciled","Contextual divergence of Mal vs MyD88 requirement mechanistically unexplained"]},{"year":2015,"claim":"Demonstrated that TIRAP is a tractable therapeutic node, as a TIR-derived peptide targeting TIRAP suppresses multiple TLR pathways and confers survival benefit in vivo.","evidence":"2R9 peptide with co-IP, imaging, in vitro binding, and murine influenza model","pmids":["26095366"],"confidence":"High","gaps":["Peptide selectivity across TIR-domain proteins not exhaustively defined","Mechanism of broad TLR (including TLR7/9) coverage incompletely explained"]},{"year":2017,"claim":"Resolved how redox state and phosphorylation regulate TIRAP: solution structure plus mass spectrometry showed C91 glutathionylation drives MyD88 binding, while Thr28 phosphorylation in the PBM disrupts membrane targeting and triggers degradation.","evidence":"Reduced-state NMR structure, mass spectrometry of LPS-activated macrophages, C91A/H92P and Thr28 mutagenesis, phosphoinositide binding and ubiquitination assays; CLIP170 co-IP/ubiquitination and SFK-Lyn studies","pmids":["28739909","28225045","29222167","29175418"],"confidence":"High","gaps":["The E3 ligase machinery for Thr28-triggered degradation not fully defined","Integration of redox, phospho, and ubiquitin signals in vivo not established"]},{"year":2018,"claim":"Tested the ordering of complex assembly, with BRET supporting TIRAP-dependent recruitment of MyD88 to TLR2 but co-IP failing to confirm constitutive interactions.","evidence":"BRET, co-IP, and confocal microscopy","pmids":["30138457"],"confidence":"Low","gaps":["BRET signals partly attributable to overexpression artefacts","Constitutive versus stimulus-induced complex composition unresolved"]},{"year":2022,"claim":"Expanded TIRAP's roles beyond canonical TLR2/4, showing it amplifies AP-1 via c-Jun, contributes to TLR8 Myddosome signaling and IRF5 activation, and drives non-canonical IFNγ–HMGB1 myelosuppression and TPL2-mediated cancer signaling.","evidence":"Co-IP/AP-1 reporter with sepsis model; TIRAP siRNA in human macrophages with TLR8/Akt/IRF5 readouts; TIRAP overexpression with IFNγ genetic deletion and bone marrow niche analysis; co-IP/KD with TPL2 and bladder cancer phenotypes","pmids":["30909134","35884781","35089323","36240653"],"confidence":"High","gaps":["Whether c-Jun, TLR8, and myelosuppression functions share the canonical membrane-recruitment mechanism is untested","IFNγ-HMGB1 axis shown via TIRAP overexpression rather than endogenous regulation"]},{"year":2023,"claim":"Revealed pathogen- and disease-context functions, with TIRAP enabling Mtb intracellular survival via blocking phagosomal acidification through Cish, and m6A-regulated TIRAP mRNA stability driving radiation-induced liver fibrosis.","evidence":"TIRAP KO/heterozygous Mtb infection models with phagosomal acidification and CFU assays; ALKBH5/MeRIP-seq with NF-κB/JNK/Smad2 readouts in hepatic stellate cells","pmids":["36888688","36792369"],"confidence":"High","gaps":["Molecular link between TIRAP and phagosomal acidification machinery incomplete","Upstream control of TIRAP m6A status not fully defined"]},{"year":2024,"claim":"Advanced chemical and regulatory mechanisms, identifying CLIP1 as a TIRAP ubiquitin ligase antagonized by TFPI2, and characterizing covalent small-molecule modification of the MAL TIR domain.","evidence":"Co-IP/ubiquitination with CLIP1/TFPI2 in liver IRI model; 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\"journal\": \"Nature immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, co-IP and reporter assays; foundational identification paper\",\n      \"pmids\": [\"11526399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TIRAP is essential for the MyD88-dependent signaling pathway shared by TLR2 and TLR4 (not TLR3, TLR7, or TLR9); TIRAP-deficient mice show abolished LPS-induced splenocyte proliferation, cytokine production, and delayed NF-κB/MAPK activation, but intact MyD88-independent responses (IFN-inducible genes, DC maturation).\",\n      \"method\": \"TIRAP knockout mouse generation, LPS/TLR ligand stimulation, NF-κB/MAPK assays, cytokine measurement\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple orthogonal readouts, replicated by two independent labs in same issue\",\n      \"pmids\": [\"12447441\", \"12447442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TIRAP-deficient mice respond normally to TLR5, TLR7, and TLR9 ligands and to IL-1 and IL-18, but have defects in cytokine production and NF-κB/MAPK activation in response to TLR4 ligand LPS and TLR2, TLR1, and TLR6 ligands, demonstrating TIRAP provides signaling specificity for a subset of TLRs.\",\n      \"method\": \"Tirap gene knockout mice, cytokine ELISA, NF-κB/MAPK activation assays, TLR ligand stimulation panel\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with comprehensive TLR ligand panel, independent replication in same journal issue\",\n      \"pmids\": [\"12447442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TIRAP is required for LPS-induced NF-κB activation and apoptosis in human endothelial cells, as demonstrated using a TIRAP dominant-negative construct, identifying a role for TIRAP in endothelial cell signaling.\",\n      \"method\": \"Dominant-negative TIRAP construct overexpression, NF-κB reporter assay, apoptosis assay in human endothelial cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, dominant-negative approach only\",\n      \"pmids\": [\"12083783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TIRAP/MAL is required for LPS-induced IRF-3 activation (but not dsRNA-induced IRF-3 activation), placing TIRAP in the pathway leading to IFN gene induction by TLR4 but not by TLR3.\",\n      \"method\": \"TIRAP overexpression, dominant-negative constructs, IRF-3 reporter assays in cell lines\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, overexpression/DN approach without genetic KO confirmation\",\n      \"pmids\": [\"12062447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In primary human fibroblasts and endothelial cells, both MyD88 and TIRAP are essential for LPS-induced IκBα phosphorylation, NF-κB activation, and IL-6/IL-8 production via IKK2; however, in macrophages, neither MyD88 nor TIRAP nor IKK2 are required for NF-κB activation or TNFα/IL-6/IL-8 production, though TIRAP is involved in IFNβ production.\",\n      \"method\": \"Dominant-negative overexpression of MyD88/TIRAP in primary human cells (fibroblasts, endothelial cells, macrophages), NF-κB reporter, cytokine ELISA, TLR4 neutralization\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (DN constructs + cytokine ELISAs + TLR neutralization) in primary human cells, single lab\",\n      \"pmids\": [\"14630816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PKCδ binds directly to TIRAP/Mal through the TIR domain of TIRAP; PKCδ binding promotes TLR2- and TLR4-mediated phosphorylation of p38 MAPK, IKK, and IκBα in macrophages.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation from macrophage lysates, TIRAP truncation mutants, PKCδ depletion (siRNA/knockdown) with signaling readouts\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pulldown plus co-IP from endogenous macrophage lysates plus domain mapping, single lab\",\n      \"pmids\": [\"17161867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TIRAP directly interacts with TRAF6 in response to TLR2 and TLR4 stimulation; this interaction is not membrane-dependent. A TIRAP E190A mutation in the TRAF6-binding motif abolishes TRAF6 interaction, fails to reconstitute proinflammatory responses in Mal-deficient macrophages, and blocks Ser phosphorylation of the NF-κB p65 subunit (controlling transcriptional activation but not nuclear translocation).\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis (E190A), reconstitution of Mal-deficient macrophages, NF-κB reporter, cytokine assays, p65 phosphorylation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus mutagenesis plus functional reconstitution with defined phenotypic readouts, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"19592497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A naturally occurring TIRAP variant D96N (Mal D96N, rs8177400) is inactive in NF-κB reporter assays, fails to interact with MyD88 by co-immunoprecipitation, and acts as a hypomorphic allele with impaired cytokine production upon TLR2/4 stimulation, demonstrating D96 resides in the MyD88-binding interface.\",\n      \"method\": \"Overexpression in reporter cell lines, co-immunoprecipitation, cytokine assays (LPS, PAM2CSK4), computer modeling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional reporter assays plus cytokine readouts in multiple cell types, single lab\",\n      \"pmids\": [\"19509286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Brucella TIR domain-containing protein TcpB mimics TIRAP by interacting with phosphoinositides through its N-terminal domain and colocalizing with the plasma membrane and cytoskeleton, blocking TIRAP-induced NF-κB activation; this supports a model where TIRAP uses phosphoinositide binding for membrane targeting.\",\n      \"method\": \"Sequence analysis, phosphoinositide binding assays, co-localization microscopy, NF-κB reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple methods (lipid binding, co-localization, reporter) but focused on bacterial mimic, indirect evidence for TIRAP mechanism\",\n      \"pmids\": [\"19196716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TIRAP requirement for TLR2 signaling can be overcome when Francisella tularensis (Ft) is retained within the phagosome or when higher concentrations of TLR2 agonists are used, revealing TIRAP's function as a 'bridging' adaptor that can be bypassed by enhanced or sustained TLR2-agonist contact from endosomal compartments. MyD88 remains absolutely required.\",\n      \"method\": \"TIRAP-deficient macrophages, bacterial infection, BFA-mediated phagosome acidification inhibition, TLR2 agonist dose-response, NF-κB reporter and cytokine assays\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO macrophages with multiple experimental manipulations, single lab\",\n      \"pmids\": [\"19889726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of the MAL/TIRAP TIR domain was determined; it reveals a unique fold with a long loop replacing a β-strand found in other TIR domains, placing the 'BB loop' proline motif in a unique surface position. Site-directed mutants confirmed key dimerization and MyD88-interacting interface residues by co-immunoprecipitation.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, co-immunoprecipitation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and co-IP functional validation\",\n      \"pmids\": [\"21873236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TIRAP and MyD88 bind to the cytoplasmic domain of RAGE after PKCζ-mediated phosphorylation at Ser391, transducing intracellular signals from ligand-activated RAGE; blocking TIRAP and MyD88 function largely abrogated RAGE intracellular signaling.\",\n      \"method\": \"Co-immunoprecipitation, kinase assays, dominant-negative inhibition, phospho-specific assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with phospho-RAGE plus functional DN inhibition, single lab\",\n      \"pmids\": [\"21829704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structures of both the Brucella TcpB TIR domain and the human TIRAP TIR domain were determined. The TIRAP TIR domain crystal structure reveals a unique N-terminal TIR fold containing a disulfide bond (Cys89–Cys134). Substantial conformational differences in the BB loop region exist between TcpB and TIRAP. TcpB–TIRAP interaction was validated by co-immunoprecipitation and NF-κB reporter assays.\",\n      \"method\": \"X-ray crystallography, hydrogen/deuterium exchange mass spectrometry, co-immunoprecipitation, NF-κB reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with HDX-MS validation and functional co-IP in one study\",\n      \"pmids\": [\"24275656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PIP5Kα (phosphatidylinositol 4-phosphate 5-kinase α) colocalized and interacted with TIRAP at the cell surface; kinase-dead PIP5Kα rendered TIRAP soluble and disrupted its membrane targeting. LPS induced bi-directional TIRAP translocation between membrane and cytosol correlating with PIP2 levels. PIP5Kα-generated PIP2 is required for TIRAP plasma membrane recruitment necessary for TLR4 signaling.\",\n      \"method\": \"shRNA/siRNA knockdown, co-localization microscopy, co-immunoprecipitation, kinase-dead mutant complementation, PIP2 measurement, cytokine assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (KD + co-IP + imaging + functional readouts), single lab\",\n      \"pmids\": [\"23297396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In a gastric tumourigenesis model, genetic ablation of Mal/TIRAP in gp130F/F mice did not reduce tumour burden (unlike MyD88 deletion), demonstrating that Mal is dispensable for TLR2-promoted gastric tumour growth whereas MyD88 is required, revealing a differential (Mal-independent) requirement for MyD88 downstream of TLR2 in this context.\",\n      \"method\": \"Genetic ablation (Mal-/- crossed into gp130F/F), tumour burden quantification, apoptosis and proliferation assays, gene expression analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic KO with defined phenotypic readouts, single lab\",\n      \"pmids\": [\"23728346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A TLR2 TIR-derived D-helix peptide (2R9) preferentially targets TIRAP as demonstrated by cell imaging, co-immunoprecipitation, and in vitro binding studies; 2R9 inhibits TIRAP recruitment to TLRs and suppresses TLR2-, TLR4-, TLR7-, and TLR9- (but not TLR3-) mediated cytokine production in vitro and in vivo, and significantly improved survival in influenza-infected mice.\",\n      \"method\": \"Cell-permeable peptide library screening, co-immunoprecipitation, cell imaging, in vitro binding, in vivo murine influenza model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (co-IP + imaging + in vitro binding + in vivo efficacy), single lab with rigorous controls\",\n      \"pmids\": [\"26095366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The solution NMR structure of reduced MAL/TIRAP TIR domain reveals a structural rearrangement compared to the crystal (disulfide-bonded) structure, including relocation of a β-strand and repositioning of the BB loop to a more typical TIR domain position. Under oxidizing conditions, C91 undergoes glutathionylation (detected by mass spectrometry in LPS-activated macrophages). The C91A mutation limits glutathionylation, acts as a dominant negative blocking MAL–MyD88 interaction, and diminishes TIRAP degradation and IRAK4 interaction; H92P mimics C91A effects.\",\n      \"method\": \"NMR structure determination, mass spectrometry, site-directed mutagenesis (C91A, H92P), co-immunoprecipitation, redox NMR, dominant-negative functional assays in macrophages\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure plus mass spectrometry plus mutagenesis plus functional co-IP, multiple orthogonal methods in single study\",\n      \"pmids\": [\"28739909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TIRAP PBM (phosphoinositide-binding motif) transitions from disordered to helical conformation upon binding phosphoinositides via basic and nonpolar residues. Phosphorylation at Thr28 within the PBM distorts its helical structure, reducing PI interactions and cell membrane targeting, and leads to TIRAP ubiquitination and degradation, serving as a negative regulatory mechanism to terminate innate immune responses.\",\n      \"method\": \"NMR spectroscopy, phosphoinositide binding assays, mutagenesis, cell membrane targeting assays, ubiquitination assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structural analysis combined with functional phosphoinositide binding, mutagenesis, and ubiquitination assays in one study\",\n      \"pmids\": [\"28225045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CLIP170 (cytoplasmic linker protein 170) interacts with TIRAP and induces ubiquitination and subsequent proteasomal degradation of TIRAP to negatively regulate TLR4-mediated proinflammatory responses; CLIP170 overexpression suppresses LPS-induced IL-6/TNFα, and CLIP170 silencing potentiates them in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, CLIP170 overexpression/siRNA knockdown, in vivo siRNA silencing in C57BL/6 mice, cytokine assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assays plus gain/loss-of-function both in vitro and in vivo, single lab\",\n      \"pmids\": [\"29222167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Src family kinase (SFK) activation induces tyrosine phosphorylation of TLR4 and dissociates MyD88 and Mal/TIRAP from TLR4, inhibiting LPS-induced NF-κB and JNK1/2 activation. Kinase-active SFK-Lyn strongly binds TLR4 and promotes its phosphorylation, whereas kinase-dead SFK-Lyn has reduced binding and does not phosphorylate TLR4, suggesting a negative feedback loop.\",\n      \"method\": \"Chemical rescue approach for SFK activation, co-immunoprecipitation of TLR4 with MyD88/TIRAP, kinase-dead and constitutively active Lyn mutants, NF-κB/JNK assays, cytokine measurements\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with gain/loss-of-function kinase mutants and functional signaling readouts, single lab\",\n      \"pmids\": [\"29175418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BRET studies confirmed that TIRAP is necessary for MyD88 interaction with TLR2; TLR2–TIRAP interaction was detected by BRET, and TLR2–MyD88 interaction only occurred in the presence of TIRAP. However, co-immunoprecipitation studies did not demonstrate constitutive interaction between these proteins, suggesting some BRET signals were artefacts of protein overexpression.\",\n      \"method\": \"BRET (bioluminescence resonance energy transfer), co-immunoprecipitation, confocal microscopy\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — BRET result partially contradicted by co-IP; authors explicitly note overexpression artefacts; single lab\",\n      \"pmids\": [\"30138457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TIRAP forms a signaling complex with c-Jun protein in macrophages in response to LPS stimulation, increasing AP-1 transcriptional activity and amplifying expression of inflammatory mediators; gefitinib was identified as an inhibitor of this TIRAP–c-Jun interaction, disrupting it in vitro and in a mouse sepsis model.\",\n      \"method\": \"Co-immunoprecipitation, AP-1 reporter assay, molecular docking, in vitro inhibitor assay, murine LPS sepsis model\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus functional reporter plus in vivo validation, single lab\",\n      \"pmids\": [\"30909134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TIRAP expression is induced in T cells by TCR stimulation and sustained by IL-2 signals via mTORC1 activation. TIRAP is required for TLR2-mediated NF-κB and ERK activation and IFN-γ production in effector T cells. Additionally, TLR2 stimulation induces mTORC1 activation through TIRAP, creating a positive feedback loop.\",\n      \"method\": \"T cell differentiation assays, mTORC1 inhibition (rapamycin), TIRAP overexpression/knockdown, NF-κB/ERK reporter assays, cytokine ELISA, IL-2 dose-response\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (KD + OE + pharmacological inhibition + genetic readouts), single lab\",\n      \"pmids\": [\"32698010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TIRAP drives myelosuppression through an IFNγ-HMGB1 axis: TIRAP overexpression upregulates IFNγ, which via IFNγR-mediated HMGB1 release disrupts the bone marrow endothelial niche and suppresses all three major hematopoietic lineages. IFNγ deletion blocks HMGB1 release, reverses the endothelial defect, and restores myelopoiesis. This function is independent of T cells or pyroptosis.\",\n      \"method\": \"TIRAP overexpression in mouse model, IFNγ genetic deletion, HMGB1 measurement, bone marrow endothelial niche analysis, hematopoietic lineage profiling\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (IFNγ KO rescues TIRAP phenotype) with multiple orthogonal readouts (HMGB1 assay, endothelial niche, hematopoietic profiling), single lab with rigorous controls\",\n      \"pmids\": [\"35089323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TIRAP is positively required for TLR8-mediated signaling in human macrophages: TIRAP is recruited to the TLR8 Myddosome signaling complex and contributes to Akt kinase activation and nuclear translocation of IRF5, promoting IFNβ, IL-12p70, and TNF expression following TLR8 stimulation.\",\n      \"method\": \"TIRAP gene silencing (siRNA) in primary human monocyte-derived macrophages, cytokine qPCR/Bioplex, immunofluorescence, cell fractionation/immunoblotting, immunoprecipitation, Akt inhibitors\",\n      \"journal\": \"Biomedicines\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (KD + co-IP + imaging + kinase inhibition), single lab, primary human cells\",\n      \"pmids\": [\"35884781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TIRAP facilitates the direct recruitment of TRAF6 to the plasma membrane for NF-κB transactivation and controls TLR4 downstream signaling through TPL2; upon S100A8/A9 binding to TLR4, TIRAP enhances TPL2 activation leading to MAPK cascade activation promoting bladder cancer cell growth, migration, and invasion.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, MAPK signaling assays, in vivo TLR4 inhibition, cancer cell phenotypic assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus KD plus in vivo inhibition with functional readouts, single lab\",\n      \"pmids\": [\"36240653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TIRAP expression is induced by Mycobacterium tuberculosis (Mtb) infection in macrophages, where it prevents phagosomal acidification and rupture, enabling intracellular bacterial replication. TIRAP-deficient macrophages restrict Mtb replication, and TIRAP heterozygous mice are more resistant to Mtb. This anti-phagosomal acidification effect occurs through a Cish-dependent signaling pathway.\",\n      \"method\": \"TIRAP KO and heterozygous mouse infection models, ex vivo macrophage infection, phagosomal acidification assays, bacterial CFU counting, Cish-dependent pathway analysis\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic models (KO, heterozygous) with defined cellular phenotype (phagosomal acidification) plus pathway identification (Cish), single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"36888688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ALKBH5-mediated m6A demethylation of TIRAP mRNA stabilizes TIRAP mRNA in hepatic stellate cells upon irradiation, activating NF-κB and JNK/Smad2 pathways downstream of TIRAP to promote hepatic stellate cell activation and radiation-induced liver fibrosis.\",\n      \"method\": \"MeRIP-seq, RNA-seq, ALKBH5 knockdown/overexpression in HSC, NF-κB/JNK/Smad2 pathway assays, m6A immunoprecipitation\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MeRIP-seq plus functional KD/OE with defined pathway readouts, single lab\",\n      \"pmids\": [\"36792369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The small molecule o-vanillin forms a covalent bond with Lys210 of MAL/TIRAP TIR domain (confirmed by NMR) and inhibits MAL higher-order assembly in vitro; however, o-vanillin inhibits TLR2 but not TLR4 signaling in mouse and human cells independently of MAL, suggesting it covalently modifies TLR2 signaling complexes directly.\",\n      \"method\": \"NMR spectroscopy (covalent bond identification), in vitro higher-order assembly assay, cell-based TLR2/TLR4 signaling assays in mouse and human cells\",\n      \"journal\": \"Journal of enzyme inhibition and medicinal chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural confirmation of covalent bond plus in vitro assembly inhibition plus cell-based functional validation, single lab\",\n      \"pmids\": [\"38416868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CLIP1 (TIRAP ubiquitin ligase) ubiquitinates TIRAP and promotes its degradation to negatively regulate TLR4/NF-κB signaling; TFPI2 inhibits CLIP1 activity (via R24 of TFPI2 KD1 domain interaction with CLIP1) to prevent TIRAP degradation and amplify inflammatory responses. HOPE (hypothermic oxygenated perfusion) reduces TFPI2 expression, thereby permitting CLIP1-mediated TIRAP ubiquitination and dampening liver ischemia-reperfusion injury.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, CLIP1/TFPI2 overexpression/knockdown, rat fatty liver IRI model, NF-κB signaling assays\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assays plus in vivo model, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"39617791\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TIRAP/MAL is a plasma membrane-localized TIR domain-containing adaptor protein that bridges MyD88 to TLR2 and TLR4 (and contributes to TLR7, TLR8, and TLR9 signaling) by binding PIP2 through its phosphoinositide-binding motif; upon TLR activation, TIRAP recruits TRAF6 and the PKCδ–p38 MAPK complex to orchestrate NF-κB transactivation and MAPK activation, while its activity is terminated by glutathionylation at Cys91 (promoting MyD88 binding), TIRAP ubiquitination/degradation triggered by Thr28 phosphorylation and CLIP170/CLIP1-mediated ubiquitination, and by SFK-induced TLR4 tyrosine phosphorylation that dissociates TIRAP from the receptor complex. Beyond canonical TLR signaling, TIRAP also transduces signals from RAGE (via PKCζ-phosphorylated Ser391), forms a complex with c-Jun to activate AP-1, and noncanonically drives IFNγ-HMGB1-mediated bone marrow suppression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TIRAP/MAL is a TIR domain-containing adaptor that provides receptor-proximal specificity to a subset of Toll-like receptor signaling pathways, bridging activated TLR2 and TLR4 to the downstream adaptor MyD88 to drive NF-\\u03baB and MAPK activation [#1, #2]. Genetic ablation in mice abolishes LPS- and TLR2-ligand-induced cytokine production and NF-\\u03baB/MAPK activation while leaving TLR3, TLR5, TLR7, TLR9, IL-1, and IL-18 responses intact, defining TIRAP as a selective adaptor rather than a universal one [#2]. TIRAP is targeted to the plasma membrane through a phosphoinositide-binding motif (PBM) that binds PIP2 generated by PIP5K\\u03b1, positioning it at the receptor for signal initiation [#14, #18]. From the membrane it directly recruits TRAF6 via a TRAF6-binding motif (E190) to control transcriptional activation through serine phosphorylation of NF-\\u03baB p65, and it engages the PKC\\u03b4 complex to promote p38, IKK, and I\\u03baB\\u03b1 phosphorylation [#6, #7]. Structural studies of the MAL TIR domain reveal a distinctive fold with a redox-sensitive cysteine (C91): glutathionylation under oxidizing conditions promotes MyD88 binding and IRAK4 engagement, coupling TIRAP function to cellular redox state [#11, #17]. TIRAP activity is terminated by several converging negative-regulatory mechanisms\\u2014Thr28 phosphorylation within the PBM that disrupts membrane binding and triggers ubiquitination/degradation, CLIP170- and CLIP1-mediated ubiquitination and proteasomal degradation, and Src-family-kinase-induced TLR4 tyrosine phosphorylation that dissociates the adaptor from the receptor [#18, #19, #20, #30]. Beyond canonical TLR signaling TIRAP transduces RAGE signals after PKC\\u03b6-mediated Ser391 phosphorylation, forms a complex with c-Jun to amplify AP-1 activity, contributes to TLR8 Myddosome signaling, and drives non-canonical IFN\\u03b3\\u2013HMGB1-mediated bone marrow suppression [#12, #22, #24, #25].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established TIRAP as a candidate TLR4 adaptor, raising the question of how it relates to MyD88-dependent versus -independent signaling.\",\n      \"evidence\": \"Cloning with overexpression, reporter, and co-IP assays identifying TIRAP and PKR in TLR4 pathways\",\n      \"pmids\": [\"11526399\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression-based; genetic requirement and receptor specificity unresolved\", \"Initial assignment to MyD88-independent pathway later refined by knockout studies\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Genetic knockouts settled the question of which TLRs require TIRAP, establishing it as a specificity-conferring adaptor for the MyD88-dependent arm of TLR2 and TLR4 but not TLR3/5/7/9 or IL-1/IL-18.\",\n      \"evidence\": \"TIRAP-deficient mice with TLR ligand panel, NF-\\u03baB/MAPK assays, and cytokine readouts\",\n      \"pmids\": [\"12447441\", \"12447442\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of receptor selectivity not defined\", \"Cell-type-dependent requirements (e.g., macrophage vs fibroblast) not yet resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed cell-type-dependent adaptor requirements, indicating TIRAP/MyD88 are essential in some primary human cells but bypassable in macrophages.\",\n      \"evidence\": \"Dominant-negative MyD88/TIRAP in primary human fibroblasts, endothelial cells, and macrophages with cytokine and reporter readouts\",\n      \"pmids\": [\"14630816\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dominant-negative approach without genetic confirmation\", \"Mechanism of macrophage-specific bypass unexplained\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified a direct effector partner, answering how TIRAP couples to MAPK/IKK signaling via PKC\\u03b4 binding through the TIR domain.\",\n      \"evidence\": \"GST pulldown, co-IP from macrophage lysates, TIRAP truncation mapping, PKC\\u03b4 knockdown with signaling readouts\",\n      \"pmids\": [\"17161867\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Stoichiometry and ordering relative to MyD88 recruitment unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined how TIRAP triggers NF-\\u03baB transcriptional output by directly recruiting TRAF6 via a defined binding motif, and mapped the MyD88-interaction interface through a natural hypomorphic variant.\",\n      \"evidence\": \"Reciprocal co-IP, E190A and D96N mutagenesis, reconstitution of Mal-deficient macrophages, p65 phosphorylation and cytokine assays\",\n      \"pmids\": [\"19592497\", \"19509286\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Separation of TRAF6-dependent transcriptional activation from nuclear translocation needs structural detail\", \"In vivo consequences of D96N variant not fully defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established the membrane-targeting logic of TIRAP through phosphoinositide binding, supported by a bacterial mimic, and defined it as a bridging adaptor bypassable under high-agonist or endosomal conditions.\",\n      \"evidence\": \"Brucella TcpB phosphoinositide binding and colocalization studies, plus TIRAP-deficient macrophages with phagosome/agonist manipulations\",\n      \"pmids\": [\"19196716\", \"19889726\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct PIP species and residues mediating TIRAP membrane binding not yet mapped\", \"Mechanism of bridging-adaptor bypass at the receptor level unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Determined the TIRAP TIR domain structure, revealing a unique fold and identifying dimerization and MyD88-interacting surface residues, and showed TIRAP also engages RAGE downstream of PKC\\u03b6.\",\n      \"evidence\": \"X-ray crystallography with mutagenesis/co-IP validation; co-IP and kinase assays linking TIRAP/MyD88 to phospho-Ser391 RAGE\",\n      \"pmids\": [\"21873236\", \"21829704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of full TIRAP signalosome with MyD88/TLR not resolved\", \"RAGE-TIRAP coupling shown by DN inhibition only\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected membrane recruitment to enzymatic PIP2 production via PIP5K\\u03b1 and provided crystallographic evidence of a disulfide-bonded TIR fold, while genetic studies revealed Mal-independent MyD88 functions in some tumor contexts.\",\n      \"evidence\": \"PIP5K\\u03b1 knockdown/co-IP/imaging with PIP2 measurement; TIRAP crystal structure with HDX-MS; Mal-/- gp130F/F gastric tumor model\",\n      \"pmids\": [\"23297396\", \"24275656\", \"23728346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional relevance of crystallographic disulfide vs solution state not yet reconciled\", \"Contextual divergence of Mal vs MyD88 requirement mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated that TIRAP is a tractable therapeutic node, as a TIR-derived peptide targeting TIRAP suppresses multiple TLR pathways and confers survival benefit in vivo.\",\n      \"evidence\": \"2R9 peptide with co-IP, imaging, in vitro binding, and murine influenza model\",\n      \"pmids\": [\"26095366\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Peptide selectivity across TIR-domain proteins not exhaustively defined\", \"Mechanism of broad TLR (including TLR7/9) coverage incompletely explained\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved how redox state and phosphorylation regulate TIRAP: solution structure plus mass spectrometry showed C91 glutathionylation drives MyD88 binding, while Thr28 phosphorylation in the PBM disrupts membrane targeting and triggers degradation.\",\n      \"evidence\": \"Reduced-state NMR structure, mass spectrometry of LPS-activated macrophages, C91A/H92P and Thr28 mutagenesis, phosphoinositide binding and ubiquitination assays; CLIP170 co-IP/ubiquitination and SFK-Lyn studies\",\n      \"pmids\": [\"28739909\", \"28225045\", \"29222167\", \"29175418\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The E3 ligase machinery for Thr28-triggered degradation not fully defined\", \"Integration of redox, phospho, and ubiquitin signals in vivo not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Tested the ordering of complex assembly, with BRET supporting TIRAP-dependent recruitment of MyD88 to TLR2 but co-IP failing to confirm constitutive interactions.\",\n      \"evidence\": \"BRET, co-IP, and confocal microscopy\",\n      \"pmids\": [\"30138457\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"BRET signals partly attributable to overexpression artefacts\", \"Constitutive versus stimulus-induced complex composition unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Expanded TIRAP's roles beyond canonical TLR2/4, showing it amplifies AP-1 via c-Jun, contributes to TLR8 Myddosome signaling and IRF5 activation, and drives non-canonical IFN\\u03b3\\u2013HMGB1 myelosuppression and TPL2-mediated cancer signaling.\",\n      \"evidence\": \"Co-IP/AP-1 reporter with sepsis model; TIRAP siRNA in human macrophages with TLR8/Akt/IRF5 readouts; TIRAP overexpression with IFN\\u03b3 genetic deletion and bone marrow niche analysis; co-IP/KD with TPL2 and bladder cancer phenotypes\",\n      \"pmids\": [\"30909134\", \"35884781\", \"35089323\", \"36240653\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether c-Jun, TLR8, and myelosuppression functions share the canonical membrane-recruitment mechanism is untested\", \"IFN\\u03b3-HMGB1 axis shown via TIRAP overexpression rather than endogenous regulation\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed pathogen- and disease-context functions, with TIRAP enabling Mtb intracellular survival via blocking phagosomal acidification through Cish, and m6A-regulated TIRAP mRNA stability driving radiation-induced liver fibrosis.\",\n      \"evidence\": \"TIRAP KO/heterozygous Mtb infection models with phagosomal acidification and CFU assays; ALKBH5/MeRIP-seq with NF-\\u03baB/JNK/Smad2 readouts in hepatic stellate cells\",\n      \"pmids\": [\"36888688\", \"36792369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between TIRAP and phagosomal acidification machinery incomplete\", \"Upstream control of TIRAP m6A status not fully defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Advanced chemical and regulatory mechanisms, identifying CLIP1 as a TIRAP ubiquitin ligase antagonized by TFPI2, and characterizing covalent small-molecule modification of the MAL TIR domain.\",\n      \"evidence\": \"Co-IP/ubiquitination with CLIP1/TFPI2 in liver IRI model; NMR-confirmed o-vanillin covalent bond at Lys210 with assembly and cell signaling assays\",\n      \"pmids\": [\"39617791\", \"38416868\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship between CLIP1 and earlier CLIP170-mediated degradation not reconciled\", \"o-vanillin inhibits TLR2 independently of MAL, so on-target relevance is limited\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the distinct regulatory layers (PIP2 recruitment, redox glutathionylation, phosphorylation, and multiple ubiquitin ligases) are integrated to time TIRAP activity within an intact signalosome, and whether the non-canonical (RAGE, c-Jun, IFN\\u03b3-HMGB1, Mtb) functions use the same molecular interfaces, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated structural model of the assembled TLR\\u2013TIRAP\\u2013MyD88 signalosome\", \"Endogenous-context validation of overexpression-driven non-canonical roles lacking\", \"In vivo hierarchy among competing degradation pathways unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 2, 7, 21]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [9, 14, 18]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 7, 26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [9, 14, 18, 26]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2, 7, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 6, 7, 12]}\n    ],\n    \"complexes\": [\"TLR4 signaling complex\", \"MyD88 Myddosome\", \"TLR8 Myddosome\"],\n    \"partners\": [\"MyD88\", \"TRAF6\", \"PKCD\", \"PIP5K1A\", \"RAGE\", \"JUN\", \"CLIP1\", \"TLR4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}