{"gene":"TNIP2","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2001,"finding":"ABIN-2 (TNIP2) binds to the C-terminal zinc finger domain of A20 and inhibits NF-κB activation induced by TNF and IL-1, as well as by overexpression of RIP or TRAF2, but not by overexpression of IKKβ or direct IKK activators such as Tax, indicating that ABIN-2 acts upstream of the IKK complex.","method":"Co-expression/interaction assays, NF-κB reporter gene assays, overexpression of pathway components","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (co-immunoprecipitation, reporter assays, epistasis via pathway component overexpression); foundational paper replicated by subsequent studies","pmids":["11390377"],"is_preprint":false},{"year":2003,"finding":"ABIN-2 interacts with the intracellular domain of the endothelial receptor tyrosine kinase Tie2, but not Tie1. The interaction requires Tie2 autophosphorylation, is stimulated by angiopoietin-1, and maps to residues 171–272 of ABIN-2. ABIN-2 is not tyrosine-phosphorylated by Tie2. Expression of ABIN-2 deletion mutants suppressed angiopoietin-1-mediated inhibition of NF-κB-dependent reporter activity in endothelial cells.","method":"Yeast two-hybrid screening, co-expression in CHO cells (co-immunoprecipitation), deletion mapping, NF-κB reporter assays in endothelial cells","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction confirmed in mammalian cells, deletion mapping, functional reporter assays; single lab but multiple orthogonal methods","pmids":["12609966"],"is_preprint":false},{"year":2003,"finding":"ABIN-2 inhibits endothelial cell apoptosis and rescues cells from death following growth factor deprivation. This anti-apoptotic function requires the carboxy-terminus of ABIN-2 and is dependent on PI3-kinase activity. Expression of truncated ABIN-2 blocked angiopoietin-1/Tie2-mediated endothelial survival.","method":"Overexpression of ABIN-2 and deletion mutants in endothelial cells, apoptosis assays, pharmacological PI3K inhibition (wortmannin, LY294002)","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional loss-of-function with defined phenotype and domain mapping; single lab, multiple methods","pmids":["12933576"],"is_preprint":false},{"year":2003,"finding":"ABIN-2 can enter the nucleus and functions as a transcriptional coactivator in yeast; only the C-terminal fragment activates transcription in mammalian cells. The N-terminal 195 amino acids retain full-length ABIN-2 in the cytoplasm of mammalian cells. ABIN-2 interacts with BAF60a, a component of the chromatin-remodeling complex, in a yeast two-hybrid assay.","method":"GAL4-fusion reporter assays in yeast, subcellular localization in mammalian cells, yeast two-hybrid (BAF60a interaction)","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method for most claims; nuclear localization and BAF60a interaction not validated by orthogonal methods in mammalian cells","pmids":["12753905"],"is_preprint":false},{"year":2004,"finding":"ABIN-2 inhibits NF-κB activation by binding to IKKγ (NEMO) and blocking the association of IKKγ with RIP. A stretch of 50 amino acids in ABIN-2 is essential for IKKγ binding; an ABIN-2 mutant lacking these 50 amino acids neither binds IKKγ nor inhibits NF-κB. A homologous region in RIP is also required for RIP-IKKγ interaction.","method":"Co-immunoprecipitation, deletion mapping in overexpression system, NF-κB reporter assays, apoptosis assays","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus deletion mutagenesis with functional validation; single lab, multiple orthogonal methods","pmids":["14653779"],"is_preprint":false},{"year":2004,"finding":"ABIN-2 forms a ternary complex with TPL-2 and NF-κB1 p105 in macrophages. ABIN-2 is required for TPL-2 protein stability: RNAi-mediated depletion of ABIN-2 dramatically reduces steady-state TPL-2 protein levels without affecting TPL-2 mRNA or p105 levels, and ABIN-2 increases the half-life of co-transfected TPL-2. TPL-2 that can activate MEK after LPS stimulation is not associated with ABIN-2, and LPS-induced activation of TPL-2 correlates with its release from ABIN-2.","method":"Affinity purification, co-immunoprecipitation, RNAi knockdown, pulse-chase half-life assay, endogenous complex characterization in bone marrow-derived macrophages","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP of endogenous proteins, RNAi with protein stability assay, multiple orthogonal methods; findings replicated in subsequent studies","pmids":["15169888"],"is_preprint":false},{"year":2006,"finding":"ABIN-2-deficient mice show reduced activation of Erk MAP kinase downstream of TPL-2-coupled receptors (TLR4 in macrophages, TNFR1 in macrophages, CD40 in B cells), establishing that ABIN-2 positively regulates ERK signaling by stabilizing TPL-2. ABIN-2 deficiency does not affect agonist-induced NF-κB regulation.","method":"Genetic knockout mice, Erk/MAP kinase activity assays in primary antigen-presenting cells, NF-κB activity assays, Western blot for TPL-2 protein levels","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with defined cellular phenotypes across multiple cell types and receptors; negative result on NF-κB is also informative","pmids":["16633345"],"is_preprint":false},{"year":2009,"finding":"IL-1 triggers dissociation of TPL-2 from ABIN-2 independently of IRAK1, IKKβ, and the PP2-sensitive kinase, identifying dissociation from ABIN-2 as a distinct signaling event upstream of TPL-2 activation. IL-1 also activates TPL-2 via an IRAK1- and IKKβ-independent but PP2-sensitive mechanism distinct from the p105 phosphorylation pathway.","method":"Co-immunoprecipitation of transfected Tpl2 and ABIN-2 in IRAK1-null HEK-293 cells, pharmacological inhibitors (PS1145, PP2), kinase activity assays","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis using null cell line plus pharmacological inhibition, multiple pathway branches tested; single lab","pmids":["19754427"],"is_preprint":false},{"year":2011,"finding":"IKKα and IKKβ both interact with ABIN-2 and impair its constitutive proteasomal degradation. ABIN-2 specifically enhances IKKα- but not IKKβ-mediated NF-κB activation by inducing IKKα autophosphorylation and kinase activity. ABIN-2 serine 146 is critical for IKKα-driven transcriptional upregulation of specific NF-κB target genes.","method":"Affinity purification of IKKα-associated proteins, co-immunoprecipitation, proteasome inhibitor assays, kinase activity assays, site-directed mutagenesis (S146), NF-κB reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — affinity purification plus mutagenesis and kinase assays; single lab, multiple orthogonal methods","pmids":["21784860"],"is_preprint":false},{"year":2015,"finding":"USP35 deubiquitinase stabilizes ABIN-2 protein by promoting its deubiquitination, thereby inhibiting TNFα-induced NF-κB activation. Overexpression of ABIN-2 rescues the NF-κB activation caused by USP35 loss.","method":"Co-immunoprecipitation, deubiquitination assay, overexpression and knockdown, NF-κB reporter assays, in vivo xenograft","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional DUB assay plus epistasis rescue experiment; single lab, multiple methods","pmids":["26348204"],"is_preprint":false},{"year":2016,"finding":"Crystal structure of the AHD1-UBAN fragment of ABIN-2 in complex with linear tri-ubiquitin reveals a 2:1 (ABIN-2:tri-ubiquitin) stoichiometry. The interaction occurs primarily through a primary ubiquitin-binding site, with a secondary site engaged under high local concentration. Three ubiquitin units form a right-handed helical trimer bridging two ABIN-2 dimers. Residues around the M1-linkage are crucial for recognition; mutagenesis confirmed functional significance.","method":"X-ray crystallography, mutagenesis, pull-down assays, isothermal titration calorimetry (ITC)","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis and biophysical validation (ITC); multiple orthogonal methods in a single rigorous study","pmids":["27916521"],"is_preprint":false},{"year":2016,"finding":"AP-MS mapping shows TNIP2 is an NF-κB network hub. NF-κB interacts with the N-terminal region of TNIP2. A central region of TNIP2 interacts with ESCRT-I complex via TSG101; a single point mutation in TNIP2 disrupts this interaction. TNIP2 associates with a specific limited set of mRNAs enriched for transcription-related functions (including Sin3A complex, Mediator complex, JUN, HOXC6, GATA2 mRNAs), and RNA-dependent protein interactions include KHDRBS1.","method":"MudPIT/Halo Affinity Purification Mass Spectrometry (AP-MS), deletion and point mutant mapping, RNA-Seq of TNIP2-associated RNAs, RNA depletion experiments","journal":"Molecular & cellular proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic AP-MS with mutant mapping and RNA-Seq; single lab but multiple orthogonal approaches","pmids":["27609421"],"is_preprint":false},{"year":2017,"finding":"RelAp43 associates with the p105-ABIN-2-TPL-2 ternary complex; RelAp43-p105 interaction stabilizes the formation of a complex with ABIN-2 and TPL-2. Rabies virus M protein interacts with ABIN-2 (and TPL-2 and RelAp43) and promotes the release of ABIN-2 from this complex, thereby favoring RelAp43-p50 NF-κB dimer production and controlling IFNβ, TNF, and CXCL2 expression.","method":"Tandem affinity purification coupled with mass spectrometry (TAP-MS), protein-fragment complementation assay, bioluminescent resonance energy transfer (BRET), recombinant rabies viruses in mice","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — TAP-MS plus BRET/PCA interaction assays plus in vivo viral model; multiple orthogonal methods, single lab","pmids":["29084252"],"is_preprint":false},{"year":2018,"finding":"The ubiquitin-binding function of ABIN-2 (residue D310) is not required for TPL-2 stability or its activation by TLR agonists or IL-1β, but is required to suppress DSS-induced colitis. ABIN-2 ubiquitin-binding promotes COX2 expression and PGE2 secretion in intestinal myofibroblasts via a Tpl2 kinase-independent pathway. The hypersensitivity of Tpl2 KO mice to DSS-colitis is attributed to loss of ABIN-2, not loss of TPL-2 catalytic activity.","method":"Knock-in mouse (ABIN2[D310N]), DSS colitis model, bone marrow transplantation, MEF and intestinal myofibroblast assays, pharmacological Tpl2 inhibition, COX2/PGE2 measurement","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — knock-in mouse with defined ubiquitin-binding mutation, epistasis with Tpl2 KO, pharmacological inhibitor, multiple cell types; strong mechanistic dissection","pmids":["30355787"],"is_preprint":false},{"year":2018,"finding":"ABIN-2 (TNIP2) is a negative regulator of allergic airway inflammation. Tnip2 knock-in mutation reducing ABIN-2 binding to A20 augments HDM-induced airway inflammation without affecting TPL-2 expression or signaling. TPL-2 kinase dead mice have unaltered responses to HDM, indicating that the allergic phenotype of Map3k8−/− mice is due to loss of TPL-2 adaptor function (i.e., reduced ABIN-2 levels) rather than loss of TPL-2 kinase activity.","method":"Knock-in mice (kinase-dead TPL-2, Tnip2 A20-binding mutant), house dust mite (HDM) allergic airway inflammation model, TPL-2 signaling assays","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent knock-in mouse models with genetic epistasis; robust mechanistic dissection","pmids":["30337469"],"is_preprint":false},{"year":2018,"finding":"The optimal substrate specificity of the TPL-2/NF-κB1 p105/ABIN-2 complex was determined using a positional scanning peptide library. The complex shows significantly altered sensitivity to existing ATP-competitive TPL-2 inhibitors compared to the isolated TPL-2 kinase domain, indicating that ABIN-2 (and p105) alter the catalytic properties of TPL-2.","method":"Positional scanning peptide library, high-throughput mass spectrometry kinase assay with the tripartite complex","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assay with the native complex using peptide library; single lab study","pmids":["29229763"],"is_preprint":false},{"year":2006,"finding":"ABIN-2 is rapidly and transiently induced after partial hepatectomy. Transgenic overexpression of ABIN-2 in liver inhibits NF-κB nuclear translocation post-hepatectomy, impairs G1/S transition, and delays hepatocyte cell cycle progression. Overexpression also suppresses endogenous ABIN-2 mRNA induction, suggesting a negative feedback mechanism.","method":"Transgenic mouse overexpression, partial hepatectomy model, NF-κB nuclear translocation assay, BrdU incorporation/cell cycle analysis, RT-PCR","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic mouse model with defined phenotype and molecular readouts; single lab, multiple endpoints","pmids":["16480954"],"is_preprint":false},{"year":2021,"finding":"Overexpression of GRβ (glucocorticoid receptor beta) promotes TNIP2 mRNA levels in human monocytes. Depletion of TNIP2 partially attenuates GRβ-mediated enhancement of TNF-α expression, indicating that TNIP2 is required for GRβ-promoted TNF-α production.","method":"GRβ overexpression in human monocytes, siRNA knockdown of TNIP2, RT-PCR for mRNA levels","journal":"Brain, behavior, and immunity","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, overexpression/knockdown with mRNA readouts only; no in vitro biochemical reconstitution","pmids":["33932528"],"is_preprint":false},{"year":2023,"finding":"TNIP2 overexpression decreases BACE1 protein levels, reduces Aβ peptides (Aβ40 and Aβ42) and C99 in APP-expressing cells, without affecting α-secretase (ADAM10) levels. TNIP2 promotes degradation of BACE1 mRNA by binding to its 3'UTR, as confirmed by luciferase reporter assay with reduced activity upon TNIP2 binding.","method":"Overexpression in SH-SY5Y-APP and HEK-APP cells, Western blot for BACE1/ADAM10/C99/Aβ, luciferase 3'UTR reporter assay, mRNA stability assay","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional overexpression with multiple protein readouts plus 3'UTR luciferase validation; single lab, multiple orthogonal methods","pmids":["37085111"],"is_preprint":false}],"current_model":"TNIP2/ABIN-2 is a multifunctional adaptor protein that forms a stable ternary complex with TPL-2 kinase and NF-κB1 p105, where it is essential for TPL-2 protein stability and consequently for optimal ERK MAP kinase activation downstream of TLR4, TNFR1, and CD40; it inhibits NF-κB signaling upstream of the IKK complex by binding IKKγ to block RIP recruitment and by engaging linear (M1-linked) polyubiquitin chains through its UBAN domain (crystal structure resolved); it also positively regulates IKKα autophosphorylation and IKKα-specific NF-κB target gene transcription; interacts with Tie2 receptor (angiopoietin-1 stimulated) to mediate endothelial survival via PI3K; is stabilized by USP35-mediated deubiquitination; suppresses allergic airway inflammation and colitis (via a COX2/PGE2 pathway) in ubiquitin-binding-dependent but TPL-2 kinase-independent manners; and additionally regulates BACE1 mRNA stability through 3'UTR binding."},"narrative":{"mechanistic_narrative":"TNIP2/ABIN-2 is a multifunctional ubiquitin-binding adaptor that operates at the intersection of NF-κB and ERK MAP kinase signaling downstream of innate immune and inflammatory receptors [PMID:11390377, PMID:15169888, PMID:16633345]. It is a stable component of a ternary complex with the kinase TPL-2 and NF-κB1 p105 in macrophages, where it is required for TPL-2 protein stability; loss of TNIP2 collapses steady-state TPL-2 levels and consequently blunts ERK activation downstream of TLR4, TNFR1, and CD40, while receptor-induced TPL-2 activation correlates with its release from TNIP2 [PMID:15169888, PMID:16633345, PMID:19754427]. As a structural subunit it also reshapes the catalytic properties of TPL-2, altering substrate selection and inhibitor sensitivity relative to the isolated kinase domain [PMID:29229763]. Independently of this scaffolding role, TNIP2 restrains NF-κB activation upstream of the IKK complex by binding A20 and by binding IKKγ (NEMO) to block RIP recruitment [PMID:11390377, PMID:14653779], and it engages linear (M1-linked) polyubiquitin through its AHD1-UBAN module, whose crystal structure with linear tri-ubiquitin reveals a 2:1 ubiquitin-bridged dimer-of-dimers architecture [PMID:27916521]. Genetic dissection separates these activities: a ubiquitin-binding mutant retains TPL-2 stabilization but loses its ability to suppress DSS colitis via a COX2/PGE2 pathway, while an A20-binding mutant exacerbates allergic airway inflammation, both occurring independently of TPL-2 catalytic activity [PMID:30355787, PMID:30337469]. TNIP2 protein abundance is controlled by ubiquitin-dependent turnover, with USP35 stabilizing it through deubiquitination [PMID:26348204]. Beyond immune signaling, TNIP2 binds the activated Tie2 receptor to promote PI3K-dependent endothelial survival [PMID:12609966, PMID:12933576] and post-transcriptionally destabilizes BACE1 mRNA through its 3'UTR [PMID:37085111].","teleology":[{"year":2001,"claim":"Established TNIP2/ABIN-2 as an A20-binding inhibitor of NF-κB acting upstream of the IKK complex, defining its initial role as a brake on inflammatory signaling.","evidence":"Co-expression/interaction assays and NF-κB reporter epistasis with overexpressed pathway components","pmids":["11390377"],"confidence":"High","gaps":["Mechanism by which A20 binding restrains IKK was not resolved","Endogenous-level validation absent"]},{"year":2003,"claim":"Identified a non-immune function: TNIP2 binds activated Tie2 (not Tie1) and mediates angiopoietin-1-driven endothelial survival via PI3K, showing the adaptor couples to receptor tyrosine kinase signaling.","evidence":"Yeast two-hybrid, co-IP in CHO cells, deletion mapping, apoptosis assays with pharmacological PI3K inhibition in endothelial cells","pmids":["12609966","12933576"],"confidence":"Medium","gaps":["TNIP2 is not phosphorylated by Tie2, so the signaling output mechanism is unresolved","Downstream effectors linking TNIP2 to PI3K not defined","In vivo endothelial relevance untested"]},{"year":2004,"claim":"Resolved a molecular mechanism for NF-κB inhibition and revealed the scaffolding role: TNIP2 binds IKKγ to block RIP recruitment, and forms a TPL-2/p105 ternary complex required for TPL-2 protein stability.","evidence":"Co-IP and deletion mapping in overexpression systems; affinity purification, RNAi, and pulse-chase half-life assays in bone marrow-derived macrophages","pmids":["14653779","15169888"],"confidence":"High","gaps":["How TNIP2 binding protects TPL-2 from degradation was not defined","Relationship between IKKγ-binding and TPL-2-stabilizing functions unclear"]},{"year":2006,"claim":"Genetic knockout established that TNIP2 positively regulates ERK signaling by stabilizing TPL-2 across multiple receptors, dissociating its ERK role from NF-κB regulation in vivo.","evidence":"ABIN-2-deficient mice with Erk/MAP kinase and NF-κB assays in primary macrophages and B cells; transgenic liver overexpression in a hepatectomy model","pmids":["16633345","16480954"],"confidence":"High","gaps":["NF-κB regulatory role seen in overexpression not reflected in knockout phenotype","Reconciliation of NF-κB-inhibitory versus ERK-stabilizing functions incomplete"]},{"year":2009,"claim":"Showed that receptor-triggered dissociation of TPL-2 from TNIP2 is a discrete activation step independent of IRAK1 and IKKβ, refining how the complex is activated.","evidence":"Co-IP of transfected proteins in IRAK1-null HEK-293 cells with pharmacological inhibitors and kinase assays","pmids":["19754427"],"confidence":"Medium","gaps":["Identity of the PP2-sensitive kinase driving dissociation unknown","Endogenous validation of dissociation kinetics lacking"]},{"year":2011,"claim":"Revealed an IKKα-specific positive function: TNIP2 promotes IKKα autophosphorylation and transcription of select NF-κB target genes in a manner dependent on serine 146.","evidence":"Affinity purification, co-IP, proteasome inhibitor and kinase assays, S146 mutagenesis, NF-κB reporters","pmids":["21784860"],"confidence":"Medium","gaps":["Single lab; how S146 controls IKKα activation unclear","Physiological gene targets in vivo not defined"]},{"year":2015,"claim":"Identified USP35 as a deubiquitinase that stabilizes TNIP2 protein, placing TNIP2 abundance under ubiquitin-dependent control to tune NF-κB output.","evidence":"Co-IP, deubiquitination assay, overexpression/knockdown with NF-κB reporters and xenograft","pmids":["26348204"],"confidence":"Medium","gaps":["The E3 ligase that ubiquitinates TNIP2 not identified","Ubiquitin linkage type and sites on TNIP2 unresolved"]},{"year":2016,"claim":"Determined the structural basis of linear ubiquitin recognition by the TNIP2 AHD1-UBAN module and mapped a broader interaction network including ESCRT-I and select mRNAs.","evidence":"X-ray crystallography of AHD1-UBAN with linear tri-ubiquitin plus ITC and mutagenesis; Halo AP-MS, point-mutant mapping, and RNA-Seq of associated mRNAs","pmids":["27916521","27609421"],"confidence":"High","gaps":["Functional consequence of ESCRT-I (TSG101) and KHDRBS1 associations not established","Significance of mRNA association for the transcription-related targets unclear"]},{"year":2017,"claim":"Showed the p105-TNIP2-TPL-2 complex incorporates RelAp43 and is targeted by rabies virus M protein, which displaces TNIP2 to reprogram NF-κB-dependent antiviral and inflammatory gene expression.","evidence":"TAP-MS, protein-fragment complementation, BRET, and recombinant rabies viruses in mice","pmids":["29084252"],"confidence":"High","gaps":["Direct binding interface between M protein and TNIP2 not mapped","Generality beyond rabies infection unknown"]},{"year":2018,"claim":"Genetic knock-in mutants cleanly separated TNIP2 adaptor and ubiquitin-binding functions from TPL-2 kinase activity, attributing colitis and allergic airway phenotypes to TNIP2-specific, kinase-independent activities.","evidence":"ABIN2[D310N] and A20-binding knock-in mice, kinase-dead TPL-2 mice, DSS colitis and HDM airway models, COX2/PGE2 measurement; peptide-library substrate profiling of the native complex","pmids":["30355787","30337469","29229763"],"confidence":"High","gaps":["Cell-type-specific contributions of ubiquitin-binding to PGE2 production partly undefined","How ubiquitin-binding drives COX2 expression mechanistically unclear"]},{"year":2023,"claim":"Extended TNIP2 function to post-transcriptional control, showing it destabilizes BACE1 mRNA via 3'UTR binding to reduce amyloidogenic processing.","evidence":"Overexpression in APP-expressing cells, Western blots for BACE1/ADAM10/C99/Aβ, 3'UTR luciferase reporter and mRNA stability assays","pmids":["37085111"],"confidence":"Medium","gaps":["Direct RNA-binding by TNIP2 versus an intermediary not distinguished","Endogenous and in vivo relevance to amyloid pathology untested"]},{"year":null,"claim":"How the distinct TNIP2 functions — TPL-2 stabilization, IKKγ/A20-mediated NF-κB inhibition, linear-ubiquitin sensing, RTK survival signaling, and mRNA destabilization — are coordinated within a single cell, and what regulates partitioning of TNIP2 among these activities, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking adaptor, ubiquitin-binding, and RNA-regulatory roles","Stoichiometry and competition among partners in vivo unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,5,1]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,8,15]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[18,11]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,4,5,6]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,13,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2]}],"complexes":["TPL-2/NF-κB1 p105/ABIN-2 ternary complex"],"partners":["MAP3K8","NFKB1","TNFAIP3","IKBKG","RIPK1","TEK","USP35","CHUK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8NFZ5","full_name":"TNFAIP3-interacting protein 2","aliases":["A20-binding inhibitor of NF-kappa-B activation 2","ABIN-2","Fetal liver LKB1-interacting protein"],"length_aa":429,"mass_kda":48.7,"function":"Inhibits NF-kappa-B activation by blocking the interaction of RIPK1 with its downstream effector NEMO/IKBKG. Forms a ternary complex with NFKB1 and MAP3K8 but appears to function upstream of MAP3K8 in the TLR4 signaling pathway that regulates MAP3K8 activation. Involved in activation of the MEK/ERK signaling pathway during innate immune response; this function seems to be stimulus- and cell type specific. Required for stability of MAP3K8. Involved in regulation of apoptosis in endothelial cells; promotes TEK agonist-stimulated endothelial survival. May act as transcriptional coactivator when translocated to the nucleus. Enhances CHUK-mediated NF-kappa-B activation involving NF-kappa-B p50-p65 and p50-c-Rel complexes","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q8NFZ5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TNIP2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TNIP2","total_profiled":1310},"omim":[{"mim_id":"620959","title":"UBIQUITIN-SPECIFIC PEPTIDASE 35; USP35","url":"https://www.omim.org/entry/620959"},{"mim_id":"610669","title":"TNFAIP3-INTERACTING PROTEIN 2; TNIP2","url":"https://www.omim.org/entry/610669"},{"mim_id":"191195","title":"MITOGEN-ACTIVATED PROTEIN KINASE KINASE KINASE 8; MAP3K8","url":"https://www.omim.org/entry/191195"},{"mim_id":"164011","title":"NUCLEAR FACTOR KAPPA-B, SUBUNIT 1; NFKB1","url":"https://www.omim.org/entry/164011"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TNIP2"},"hgnc":{"alias_symbol":["ABIN-2","MGC4289","KLIP","FLIP1","ABIN2"],"prev_symbol":[]},"alphafold":{"accession":"Q8NFZ5","domains":[{"cath_id":"-","chopping":"116-175_203-250","consensus_level":"medium","plddt":94.3322,"start":116,"end":250},{"cath_id":"1.20.5","chopping":"275-336","consensus_level":"medium","plddt":97.9689,"start":275,"end":336}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NFZ5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NFZ5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NFZ5-F1-predicted_aligned_error_v6.png","plddt_mean":81.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TNIP2","jax_strain_url":"https://www.jax.org/strain/search?query=TNIP2"},"sequence":{"accession":"Q8NFZ5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NFZ5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NFZ5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NFZ5"}},"corpus_meta":[{"pmid":"12609966","id":"PMC_12609966","title":"The antiinflammatory endothelial tyrosine kinase Tie2 interacts with a novel nuclear factor-kappaB inhibitor ABIN-2.","date":"2003","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/12609966","citation_count":130,"is_preprint":false},{"pmid":"11390377","id":"PMC_11390377","title":"Identification of a novel A20-binding inhibitor of nuclear factor-kappa B activation termed ABIN-2.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11390377","citation_count":85,"is_preprint":false},{"pmid":"15169888","id":"PMC_15169888","title":"ABIN-2 forms a ternary complex with TPL-2 and NF-kappa B1 p105 and is essential for TPL-2 protein stability.","date":"2004","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15169888","citation_count":82,"is_preprint":false},{"pmid":"16633345","id":"PMC_16633345","title":"ABIN-2 is required for optimal activation of Erk MAP kinase in innate immune responses.","date":"2006","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/16633345","citation_count":74,"is_preprint":false},{"pmid":"12933576","id":"PMC_12933576","title":"ABIN-2 protects endothelial cells from death and has a role in the antiapoptotic effect of angiopoietin-1.","date":"2003","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/12933576","citation_count":59,"is_preprint":false},{"pmid":"15297189","id":"PMC_15297189","title":"Identification of a novel mechanism of NF-kappaB inactivation by progesterone through progesterone receptors in Hec50co poorly differentiated endometrial cancer cells: induction of A20 and ABIN-2.","date":"2004","source":"Gynecologic oncology","url":"https://pubmed.ncbi.nlm.nih.gov/15297189","citation_count":52,"is_preprint":false},{"pmid":"28861170","id":"PMC_28861170","title":"MiR-663a/MiR-423-5p are involved in the pathogenesis of lupus nephritis via modulating the activation of NF-κB by targeting TNIP2.","date":"2017","source":"American journal of translational research","url":"https://pubmed.ncbi.nlm.nih.gov/28861170","citation_count":40,"is_preprint":false},{"pmid":"26348204","id":"PMC_26348204","title":"USP35 activated by miR let-7a inhibits cell proliferation and NF-κB activation through stabilization of ABIN-2.","date":"2015","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/26348204","citation_count":34,"is_preprint":false},{"pmid":"32256793","id":"PMC_32256793","title":"microRNA-15a-5p participates in sepsis by regulating the inflammatory response of macrophages and targeting TNIP2.","date":"2020","source":"Experimental and therapeutic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/32256793","citation_count":34,"is_preprint":false},{"pmid":"27044843","id":"PMC_27044843","title":"MiR-1180 promoted the proliferation of hepatocellular carcinoma cells by repressing TNIP2 expression.","date":"2016","source":"Biomedicine & pharmacotherapy = Biomedecine & 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major depressive disorder.","date":"2021","source":"Brain, behavior, and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/33932528","citation_count":22,"is_preprint":false},{"pmid":"31401161","id":"PMC_31401161","title":"ABIN-2, of the TPL-2 Signaling Complex, Modulates Mammalian Inflammation.","date":"2019","source":"Trends in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/31401161","citation_count":20,"is_preprint":false},{"pmid":"30337469","id":"PMC_30337469","title":"A20-binding inhibitor of NF-κB (ABIN) 2 negatively regulates allergic airway inflammation.","date":"2018","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/30337469","citation_count":19,"is_preprint":false},{"pmid":"27916521","id":"PMC_27916521","title":"Structural Insights into Linear Tri-ubiquitin Recognition by A20-Binding Inhibitor of NF-κB, ABIN-2.","date":"2016","source":"Structure (London, England : 1993)","url":"https://pubmed.ncbi.nlm.nih.gov/27916521","citation_count":18,"is_preprint":false},{"pmid":"19754427","id":"PMC_19754427","title":"IRAK1-independent pathways required for the interleukin-1-stimulated activation of the Tpl2 catalytic subunit and its dissociation from ABIN2.","date":"2009","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/19754427","citation_count":17,"is_preprint":false},{"pmid":"23557442","id":"PMC_23557442","title":"Ebola virus VP35 induces high-level production of recombinant TPL-2-ABIN-2-NF-κB1 p105 complex in co-transfected HEK-293 cells.","date":"2013","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/23557442","citation_count":16,"is_preprint":false},{"pmid":"31521978","id":"PMC_31521978","title":"The clinical responses of TNIP2-ALK fusion variants to crizotinib in ALK-rearranged lung adenocarcinoma.","date":"2019","source":"Lung cancer (Amsterdam, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/31521978","citation_count":15,"is_preprint":false},{"pmid":"29176547","id":"PMC_29176547","title":"Protective Role of TNIP2 in Myocardial Injury Induced by Acute Pancreatitis and Its Mechanism.","date":"2017","source":"Medical science monitor : international medical journal of experimental and clinical research","url":"https://pubmed.ncbi.nlm.nih.gov/29176547","citation_count":15,"is_preprint":false},{"pmid":"37148522","id":"PMC_37148522","title":"Aberrant Histone Modification of TNFAIP3, TLR4, TNIP2, miR-146a, and miR-155 in Major Depressive Disorder.","date":"2023","source":"Molecular neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/37148522","citation_count":14,"is_preprint":false},{"pmid":"33996849","id":"PMC_33996849","title":"Novel TNIP2 and TRAF2 Variants Are Implicated in the Pathogenesis of Pulmonary Arterial Hypertension.","date":"2021","source":"Frontiers in medicine","url":"https://pubmed.ncbi.nlm.nih.gov/33996849","citation_count":14,"is_preprint":false},{"pmid":"35433535","id":"PMC_35433535","title":"Hyperoxia Induced Bronchopulmonary Dysplasia-Like Inflammation via miR34a-TNIP2-IL-1β Pathway.","date":"2022","source":"Frontiers in pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/35433535","citation_count":10,"is_preprint":false},{"pmid":"12753905","id":"PMC_12753905","title":"The A20-binding protein ABIN-2 exerts unexpected function in mediating transcriptional coactivation.","date":"2003","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/12753905","citation_count":9,"is_preprint":false},{"pmid":"30355787","id":"PMC_30355787","title":"ABIN2 Function Is Required To Suppress DSS-Induced Colitis by a Tpl2-Independent Mechanism.","date":"2018","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/30355787","citation_count":8,"is_preprint":false},{"pmid":"16480954","id":"PMC_16480954","title":"Overexpression of ABIN-2, a negative regulator of NF-kappaB, delays liver regeneration in the ABIN-2 transgenic mice.","date":"2006","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/16480954","citation_count":8,"is_preprint":false},{"pmid":"37085111","id":"PMC_37085111","title":"TNIP2 inhibits amyloidogenesis by regulating the 3'UTR of BACE1: An in vitro study.","date":"2023","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/37085111","citation_count":6,"is_preprint":false},{"pmid":"30720079","id":"PMC_30720079","title":"Expression and role of TNIP2 in multiple organ dysfunction syndrome following severe trauma.","date":"2019","source":"Molecular medicine 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genetics","url":"https://pubmed.ncbi.nlm.nih.gov/38379038","citation_count":3,"is_preprint":false},{"pmid":"29229763","id":"PMC_29229763","title":"Assaying kinase activity of the TPL-2/NF-κB1 p105/ABIN-2 complex using an optimal peptide substrate.","date":"2018","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/29229763","citation_count":0,"is_preprint":false},{"pmid":"39775470","id":"PMC_39775470","title":"Icariside II Alleviates Chondrocyte Inflammatory Injury by Inhibiting the TNIP2/NF-κB Pathway.","date":"2025","source":"Cell biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/39775470","citation_count":0,"is_preprint":false},{"pmid":"41992343","id":"PMC_41992343","title":"Atractylenolide II alleviates LPS-induced acute lung injury in A549 cells via the TNIP2/NF-κB pathway.","date":"2026","source":"Journal of cardiothoracic surgery","url":"https://pubmed.ncbi.nlm.nih.gov/41992343","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":22146,"output_tokens":5492,"usd":0.074409,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13916,"output_tokens":4312,"usd":0.08869,"stage2_stop_reason":"end_turn"},"total_usd":0.163099,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"ABIN-2 (TNIP2) binds to the C-terminal zinc finger domain of A20 and inhibits NF-κB activation induced by TNF and IL-1, as well as by overexpression of RIP or TRAF2, but not by overexpression of IKKβ or direct IKK activators such as Tax, indicating that ABIN-2 acts upstream of the IKK complex.\",\n      \"method\": \"Co-expression/interaction assays, NF-κB reporter gene assays, overexpression of pathway components\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (co-immunoprecipitation, reporter assays, epistasis via pathway component overexpression); foundational paper replicated by subsequent studies\",\n      \"pmids\": [\"11390377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ABIN-2 interacts with the intracellular domain of the endothelial receptor tyrosine kinase Tie2, but not Tie1. The interaction requires Tie2 autophosphorylation, is stimulated by angiopoietin-1, and maps to residues 171–272 of ABIN-2. ABIN-2 is not tyrosine-phosphorylated by Tie2. Expression of ABIN-2 deletion mutants suppressed angiopoietin-1-mediated inhibition of NF-κB-dependent reporter activity in endothelial cells.\",\n      \"method\": \"Yeast two-hybrid screening, co-expression in CHO cells (co-immunoprecipitation), deletion mapping, NF-κB reporter assays in endothelial cells\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction confirmed in mammalian cells, deletion mapping, functional reporter assays; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"12609966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ABIN-2 inhibits endothelial cell apoptosis and rescues cells from death following growth factor deprivation. This anti-apoptotic function requires the carboxy-terminus of ABIN-2 and is dependent on PI3-kinase activity. Expression of truncated ABIN-2 blocked angiopoietin-1/Tie2-mediated endothelial survival.\",\n      \"method\": \"Overexpression of ABIN-2 and deletion mutants in endothelial cells, apoptosis assays, pharmacological PI3K inhibition (wortmannin, LY294002)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional loss-of-function with defined phenotype and domain mapping; single lab, multiple methods\",\n      \"pmids\": [\"12933576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ABIN-2 can enter the nucleus and functions as a transcriptional coactivator in yeast; only the C-terminal fragment activates transcription in mammalian cells. The N-terminal 195 amino acids retain full-length ABIN-2 in the cytoplasm of mammalian cells. ABIN-2 interacts with BAF60a, a component of the chromatin-remodeling complex, in a yeast two-hybrid assay.\",\n      \"method\": \"GAL4-fusion reporter assays in yeast, subcellular localization in mammalian cells, yeast two-hybrid (BAF60a interaction)\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method for most claims; nuclear localization and BAF60a interaction not validated by orthogonal methods in mammalian cells\",\n      \"pmids\": [\"12753905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ABIN-2 inhibits NF-κB activation by binding to IKKγ (NEMO) and blocking the association of IKKγ with RIP. A stretch of 50 amino acids in ABIN-2 is essential for IKKγ binding; an ABIN-2 mutant lacking these 50 amino acids neither binds IKKγ nor inhibits NF-κB. A homologous region in RIP is also required for RIP-IKKγ interaction.\",\n      \"method\": \"Co-immunoprecipitation, deletion mapping in overexpression system, NF-κB reporter assays, apoptosis assays\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus deletion mutagenesis with functional validation; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"14653779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ABIN-2 forms a ternary complex with TPL-2 and NF-κB1 p105 in macrophages. ABIN-2 is required for TPL-2 protein stability: RNAi-mediated depletion of ABIN-2 dramatically reduces steady-state TPL-2 protein levels without affecting TPL-2 mRNA or p105 levels, and ABIN-2 increases the half-life of co-transfected TPL-2. TPL-2 that can activate MEK after LPS stimulation is not associated with ABIN-2, and LPS-induced activation of TPL-2 correlates with its release from ABIN-2.\",\n      \"method\": \"Affinity purification, co-immunoprecipitation, RNAi knockdown, pulse-chase half-life assay, endogenous complex characterization in bone marrow-derived macrophages\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP of endogenous proteins, RNAi with protein stability assay, multiple orthogonal methods; findings replicated in subsequent studies\",\n      \"pmids\": [\"15169888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ABIN-2-deficient mice show reduced activation of Erk MAP kinase downstream of TPL-2-coupled receptors (TLR4 in macrophages, TNFR1 in macrophages, CD40 in B cells), establishing that ABIN-2 positively regulates ERK signaling by stabilizing TPL-2. ABIN-2 deficiency does not affect agonist-induced NF-κB regulation.\",\n      \"method\": \"Genetic knockout mice, Erk/MAP kinase activity assays in primary antigen-presenting cells, NF-κB activity assays, Western blot for TPL-2 protein levels\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with defined cellular phenotypes across multiple cell types and receptors; negative result on NF-κB is also informative\",\n      \"pmids\": [\"16633345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"IL-1 triggers dissociation of TPL-2 from ABIN-2 independently of IRAK1, IKKβ, and the PP2-sensitive kinase, identifying dissociation from ABIN-2 as a distinct signaling event upstream of TPL-2 activation. IL-1 also activates TPL-2 via an IRAK1- and IKKβ-independent but PP2-sensitive mechanism distinct from the p105 phosphorylation pathway.\",\n      \"method\": \"Co-immunoprecipitation of transfected Tpl2 and ABIN-2 in IRAK1-null HEK-293 cells, pharmacological inhibitors (PS1145, PP2), kinase activity assays\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis using null cell line plus pharmacological inhibition, multiple pathway branches tested; single lab\",\n      \"pmids\": [\"19754427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IKKα and IKKβ both interact with ABIN-2 and impair its constitutive proteasomal degradation. ABIN-2 specifically enhances IKKα- but not IKKβ-mediated NF-κB activation by inducing IKKα autophosphorylation and kinase activity. ABIN-2 serine 146 is critical for IKKα-driven transcriptional upregulation of specific NF-κB target genes.\",\n      \"method\": \"Affinity purification of IKKα-associated proteins, co-immunoprecipitation, proteasome inhibitor assays, kinase activity assays, site-directed mutagenesis (S146), NF-κB reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — affinity purification plus mutagenesis and kinase assays; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21784860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"USP35 deubiquitinase stabilizes ABIN-2 protein by promoting its deubiquitination, thereby inhibiting TNFα-induced NF-κB activation. Overexpression of ABIN-2 rescues the NF-κB activation caused by USP35 loss.\",\n      \"method\": \"Co-immunoprecipitation, deubiquitination assay, overexpression and knockdown, NF-κB reporter assays, in vivo xenograft\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional DUB assay plus epistasis rescue experiment; single lab, multiple methods\",\n      \"pmids\": [\"26348204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structure of the AHD1-UBAN fragment of ABIN-2 in complex with linear tri-ubiquitin reveals a 2:1 (ABIN-2:tri-ubiquitin) stoichiometry. The interaction occurs primarily through a primary ubiquitin-binding site, with a secondary site engaged under high local concentration. Three ubiquitin units form a right-handed helical trimer bridging two ABIN-2 dimers. Residues around the M1-linkage are crucial for recognition; mutagenesis confirmed functional significance.\",\n      \"method\": \"X-ray crystallography, mutagenesis, pull-down assays, isothermal titration calorimetry (ITC)\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis and biophysical validation (ITC); multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"27916521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AP-MS mapping shows TNIP2 is an NF-κB network hub. NF-κB interacts with the N-terminal region of TNIP2. A central region of TNIP2 interacts with ESCRT-I complex via TSG101; a single point mutation in TNIP2 disrupts this interaction. TNIP2 associates with a specific limited set of mRNAs enriched for transcription-related functions (including Sin3A complex, Mediator complex, JUN, HOXC6, GATA2 mRNAs), and RNA-dependent protein interactions include KHDRBS1.\",\n      \"method\": \"MudPIT/Halo Affinity Purification Mass Spectrometry (AP-MS), deletion and point mutant mapping, RNA-Seq of TNIP2-associated RNAs, RNA depletion experiments\",\n      \"journal\": \"Molecular & cellular proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic AP-MS with mutant mapping and RNA-Seq; single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"27609421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RelAp43 associates with the p105-ABIN-2-TPL-2 ternary complex; RelAp43-p105 interaction stabilizes the formation of a complex with ABIN-2 and TPL-2. Rabies virus M protein interacts with ABIN-2 (and TPL-2 and RelAp43) and promotes the release of ABIN-2 from this complex, thereby favoring RelAp43-p50 NF-κB dimer production and controlling IFNβ, TNF, and CXCL2 expression.\",\n      \"method\": \"Tandem affinity purification coupled with mass spectrometry (TAP-MS), protein-fragment complementation assay, bioluminescent resonance energy transfer (BRET), recombinant rabies viruses in mice\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — TAP-MS plus BRET/PCA interaction assays plus in vivo viral model; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"29084252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The ubiquitin-binding function of ABIN-2 (residue D310) is not required for TPL-2 stability or its activation by TLR agonists or IL-1β, but is required to suppress DSS-induced colitis. ABIN-2 ubiquitin-binding promotes COX2 expression and PGE2 secretion in intestinal myofibroblasts via a Tpl2 kinase-independent pathway. The hypersensitivity of Tpl2 KO mice to DSS-colitis is attributed to loss of ABIN-2, not loss of TPL-2 catalytic activity.\",\n      \"method\": \"Knock-in mouse (ABIN2[D310N]), DSS colitis model, bone marrow transplantation, MEF and intestinal myofibroblast assays, pharmacological Tpl2 inhibition, COX2/PGE2 measurement\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knock-in mouse with defined ubiquitin-binding mutation, epistasis with Tpl2 KO, pharmacological inhibitor, multiple cell types; strong mechanistic dissection\",\n      \"pmids\": [\"30355787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ABIN-2 (TNIP2) is a negative regulator of allergic airway inflammation. Tnip2 knock-in mutation reducing ABIN-2 binding to A20 augments HDM-induced airway inflammation without affecting TPL-2 expression or signaling. TPL-2 kinase dead mice have unaltered responses to HDM, indicating that the allergic phenotype of Map3k8−/− mice is due to loss of TPL-2 adaptor function (i.e., reduced ABIN-2 levels) rather than loss of TPL-2 kinase activity.\",\n      \"method\": \"Knock-in mice (kinase-dead TPL-2, Tnip2 A20-binding mutant), house dust mite (HDM) allergic airway inflammation model, TPL-2 signaling assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent knock-in mouse models with genetic epistasis; robust mechanistic dissection\",\n      \"pmids\": [\"30337469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The optimal substrate specificity of the TPL-2/NF-κB1 p105/ABIN-2 complex was determined using a positional scanning peptide library. The complex shows significantly altered sensitivity to existing ATP-competitive TPL-2 inhibitors compared to the isolated TPL-2 kinase domain, indicating that ABIN-2 (and p105) alter the catalytic properties of TPL-2.\",\n      \"method\": \"Positional scanning peptide library, high-throughput mass spectrometry kinase assay with the tripartite complex\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assay with the native complex using peptide library; single lab study\",\n      \"pmids\": [\"29229763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ABIN-2 is rapidly and transiently induced after partial hepatectomy. Transgenic overexpression of ABIN-2 in liver inhibits NF-κB nuclear translocation post-hepatectomy, impairs G1/S transition, and delays hepatocyte cell cycle progression. Overexpression also suppresses endogenous ABIN-2 mRNA induction, suggesting a negative feedback mechanism.\",\n      \"method\": \"Transgenic mouse overexpression, partial hepatectomy model, NF-κB nuclear translocation assay, BrdU incorporation/cell cycle analysis, RT-PCR\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic mouse model with defined phenotype and molecular readouts; single lab, multiple endpoints\",\n      \"pmids\": [\"16480954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Overexpression of GRβ (glucocorticoid receptor beta) promotes TNIP2 mRNA levels in human monocytes. Depletion of TNIP2 partially attenuates GRβ-mediated enhancement of TNF-α expression, indicating that TNIP2 is required for GRβ-promoted TNF-α production.\",\n      \"method\": \"GRβ overexpression in human monocytes, siRNA knockdown of TNIP2, RT-PCR for mRNA levels\",\n      \"journal\": \"Brain, behavior, and immunity\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, overexpression/knockdown with mRNA readouts only; no in vitro biochemical reconstitution\",\n      \"pmids\": [\"33932528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TNIP2 overexpression decreases BACE1 protein levels, reduces Aβ peptides (Aβ40 and Aβ42) and C99 in APP-expressing cells, without affecting α-secretase (ADAM10) levels. TNIP2 promotes degradation of BACE1 mRNA by binding to its 3'UTR, as confirmed by luciferase reporter assay with reduced activity upon TNIP2 binding.\",\n      \"method\": \"Overexpression in SH-SY5Y-APP and HEK-APP cells, Western blot for BACE1/ADAM10/C99/Aβ, luciferase 3'UTR reporter assay, mRNA stability assay\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional overexpression with multiple protein readouts plus 3'UTR luciferase validation; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"37085111\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TNIP2/ABIN-2 is a multifunctional adaptor protein that forms a stable ternary complex with TPL-2 kinase and NF-κB1 p105, where it is essential for TPL-2 protein stability and consequently for optimal ERK MAP kinase activation downstream of TLR4, TNFR1, and CD40; it inhibits NF-κB signaling upstream of the IKK complex by binding IKKγ to block RIP recruitment and by engaging linear (M1-linked) polyubiquitin chains through its UBAN domain (crystal structure resolved); it also positively regulates IKKα autophosphorylation and IKKα-specific NF-κB target gene transcription; interacts with Tie2 receptor (angiopoietin-1 stimulated) to mediate endothelial survival via PI3K; is stabilized by USP35-mediated deubiquitination; suppresses allergic airway inflammation and colitis (via a COX2/PGE2 pathway) in ubiquitin-binding-dependent but TPL-2 kinase-independent manners; and additionally regulates BACE1 mRNA stability through 3'UTR binding.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TNIP2/ABIN-2 is a multifunctional ubiquitin-binding adaptor that operates at the intersection of NF-\\u03baB and ERK MAP kinase signaling downstream of innate immune and inflammatory receptors [#0, #5, #6]. It is a stable component of a ternary complex with the kinase TPL-2 and NF-\\u03baB1 p105 in macrophages, where it is required for TPL-2 protein stability; loss of TNIP2 collapses steady-state TPL-2 levels and consequently blunts ERK activation downstream of TLR4, TNFR1, and CD40, while receptor-induced TPL-2 activation correlates with its release from TNIP2 [#5, #6, #7]. As a structural subunit it also reshapes the catalytic properties of TPL-2, altering substrate selection and inhibitor sensitivity relative to the isolated kinase domain [#15]. Independently of this scaffolding role, TNIP2 restrains NF-\\u03baB activation upstream of the IKK complex by binding A20 and by binding IKK\\u03b3 (NEMO) to block RIP recruitment [#0, #4], and it engages linear (M1-linked) polyubiquitin through its AHD1-UBAN module, whose crystal structure with linear tri-ubiquitin reveals a 2:1 ubiquitin-bridged dimer-of-dimers architecture [#10]. Genetic dissection separates these activities: a ubiquitin-binding mutant retains TPL-2 stabilization but loses its ability to suppress DSS colitis via a COX2/PGE2 pathway, while an A20-binding mutant exacerbates allergic airway inflammation, both occurring independently of TPL-2 catalytic activity [#13, #14]. TNIP2 protein abundance is controlled by ubiquitin-dependent turnover, with USP35 stabilizing it through deubiquitination [#9]. Beyond immune signaling, TNIP2 binds the activated Tie2 receptor to promote PI3K-dependent endothelial survival [#1, #2] and post-transcriptionally destabilizes BACE1 mRNA through its 3'UTR [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established TNIP2/ABIN-2 as an A20-binding inhibitor of NF-\\u03baB acting upstream of the IKK complex, defining its initial role as a brake on inflammatory signaling.\",\n      \"evidence\": \"Co-expression/interaction assays and NF-\\u03baB reporter epistasis with overexpressed pathway components\",\n      \"pmids\": [\"11390377\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which A20 binding restrains IKK was not resolved\", \"Endogenous-level validation absent\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified a non-immune function: TNIP2 binds activated Tie2 (not Tie1) and mediates angiopoietin-1-driven endothelial survival via PI3K, showing the adaptor couples to receptor tyrosine kinase signaling.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP in CHO cells, deletion mapping, apoptosis assays with pharmacological PI3K inhibition in endothelial cells\",\n      \"pmids\": [\"12609966\", \"12933576\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"TNIP2 is not phosphorylated by Tie2, so the signaling output mechanism is unresolved\", \"Downstream effectors linking TNIP2 to PI3K not defined\", \"In vivo endothelial relevance untested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved a molecular mechanism for NF-\\u03baB inhibition and revealed the scaffolding role: TNIP2 binds IKK\\u03b3 to block RIP recruitment, and forms a TPL-2/p105 ternary complex required for TPL-2 protein stability.\",\n      \"evidence\": \"Co-IP and deletion mapping in overexpression systems; affinity purification, RNAi, and pulse-chase half-life assays in bone marrow-derived macrophages\",\n      \"pmids\": [\"14653779\", \"15169888\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TNIP2 binding protects TPL-2 from degradation was not defined\", \"Relationship between IKK\\u03b3-binding and TPL-2-stabilizing functions unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Genetic knockout established that TNIP2 positively regulates ERK signaling by stabilizing TPL-2 across multiple receptors, dissociating its ERK role from NF-\\u03baB regulation in vivo.\",\n      \"evidence\": \"ABIN-2-deficient mice with Erk/MAP kinase and NF-\\u03baB assays in primary macrophages and B cells; transgenic liver overexpression in a hepatectomy model\",\n      \"pmids\": [\"16633345\", \"16480954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"NF-\\u03baB regulatory role seen in overexpression not reflected in knockout phenotype\", \"Reconciliation of NF-\\u03baB-inhibitory versus ERK-stabilizing functions incomplete\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed that receptor-triggered dissociation of TPL-2 from TNIP2 is a discrete activation step independent of IRAK1 and IKK\\u03b2, refining how the complex is activated.\",\n      \"evidence\": \"Co-IP of transfected proteins in IRAK1-null HEK-293 cells with pharmacological inhibitors and kinase assays\",\n      \"pmids\": [\"19754427\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the PP2-sensitive kinase driving dissociation unknown\", \"Endogenous validation of dissociation kinetics lacking\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed an IKK\\u03b1-specific positive function: TNIP2 promotes IKK\\u03b1 autophosphorylation and transcription of select NF-\\u03baB target genes in a manner dependent on serine 146.\",\n      \"evidence\": \"Affinity purification, co-IP, proteasome inhibitor and kinase assays, S146 mutagenesis, NF-\\u03baB reporters\",\n      \"pmids\": [\"21784860\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; how S146 controls IKK\\u03b1 activation unclear\", \"Physiological gene targets in vivo not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified USP35 as a deubiquitinase that stabilizes TNIP2 protein, placing TNIP2 abundance under ubiquitin-dependent control to tune NF-\\u03baB output.\",\n      \"evidence\": \"Co-IP, deubiquitination assay, overexpression/knockdown with NF-\\u03baB reporters and xenograft\",\n      \"pmids\": [\"26348204\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The E3 ligase that ubiquitinates TNIP2 not identified\", \"Ubiquitin linkage type and sites on TNIP2 unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Determined the structural basis of linear ubiquitin recognition by the TNIP2 AHD1-UBAN module and mapped a broader interaction network including ESCRT-I and select mRNAs.\",\n      \"evidence\": \"X-ray crystallography of AHD1-UBAN with linear tri-ubiquitin plus ITC and mutagenesis; Halo AP-MS, point-mutant mapping, and RNA-Seq of associated mRNAs\",\n      \"pmids\": [\"27916521\", \"27609421\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of ESCRT-I (TSG101) and KHDRBS1 associations not established\", \"Significance of mRNA association for the transcription-related targets unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed the p105-TNIP2-TPL-2 complex incorporates RelAp43 and is targeted by rabies virus M protein, which displaces TNIP2 to reprogram NF-\\u03baB-dependent antiviral and inflammatory gene expression.\",\n      \"evidence\": \"TAP-MS, protein-fragment complementation, BRET, and recombinant rabies viruses in mice\",\n      \"pmids\": [\"29084252\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding interface between M protein and TNIP2 not mapped\", \"Generality beyond rabies infection unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Genetic knock-in mutants cleanly separated TNIP2 adaptor and ubiquitin-binding functions from TPL-2 kinase activity, attributing colitis and allergic airway phenotypes to TNIP2-specific, kinase-independent activities.\",\n      \"evidence\": \"ABIN2[D310N] and A20-binding knock-in mice, kinase-dead TPL-2 mice, DSS colitis and HDM airway models, COX2/PGE2 measurement; peptide-library substrate profiling of the native complex\",\n      \"pmids\": [\"30355787\", \"30337469\", \"29229763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type-specific contributions of ubiquitin-binding to PGE2 production partly undefined\", \"How ubiquitin-binding drives COX2 expression mechanistically unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended TNIP2 function to post-transcriptional control, showing it destabilizes BACE1 mRNA via 3'UTR binding to reduce amyloidogenic processing.\",\n      \"evidence\": \"Overexpression in APP-expressing cells, Western blots for BACE1/ADAM10/C99/A\\u03b2, 3'UTR luciferase reporter and mRNA stability assays\",\n      \"pmids\": [\"37085111\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct RNA-binding by TNIP2 versus an intermediary not distinguished\", \"Endogenous and in vivo relevance to amyloid pathology untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the distinct TNIP2 functions \\u2014 TPL-2 stabilization, IKK\\u03b3/A20-mediated NF-\\u03baB inhibition, linear-ubiquitin sensing, RTK survival signaling, and mRNA destabilization \\u2014 are coordinated within a single cell, and what regulates partitioning of TNIP2 among these activities, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking adaptor, ubiquitin-binding, and RNA-regulatory roles\", \"Stoichiometry and competition among partners in vivo unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 5, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 8, 15]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [18, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 5, 6]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 13, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\n      \"TPL-2/NF-\\u03baB1 p105/ABIN-2 ternary complex\"\n    ],\n    \"partners\": [\n      \"MAP3K8\",\n      \"NFKB1\",\n      \"TNFAIP3\",\n      \"IKBKG\",\n      \"RIPK1\",\n      \"TEK\",\n      \"USP35\",\n      \"CHUK\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}