| 2001 |
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. |
Co-expression/interaction assays, NF-κB reporter gene assays, overexpression of pathway components |
The Journal of biological chemistry |
High |
11390377
|
| 2003 |
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. |
Yeast two-hybrid screening, co-expression in CHO cells (co-immunoprecipitation), deletion mapping, NF-κB reporter assays in endothelial cells |
Circulation research |
High |
12609966
|
| 2003 |
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. |
Overexpression of ABIN-2 and deletion mutants in endothelial cells, apoptosis assays, pharmacological PI3K inhibition (wortmannin, LY294002) |
Blood |
Medium |
12933576
|
| 2003 |
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. |
GAL4-fusion reporter assays in yeast, subcellular localization in mammalian cells, yeast two-hybrid (BAF60a interaction) |
FEBS letters |
Low |
12753905
|
| 2004 |
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. |
Co-immunoprecipitation, deletion mapping in overexpression system, NF-κB reporter assays, apoptosis assays |
The Biochemical journal |
Medium |
14653779
|
| 2004 |
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. |
Affinity purification, co-immunoprecipitation, RNAi knockdown, pulse-chase half-life assay, endogenous complex characterization in bone marrow-derived macrophages |
Molecular and cellular biology |
High |
15169888
|
| 2006 |
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. |
Genetic knockout mice, Erk/MAP kinase activity assays in primary antigen-presenting cells, NF-κB activity assays, Western blot for TPL-2 protein levels |
Nature immunology |
High |
16633345
|
| 2009 |
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. |
Co-immunoprecipitation of transfected Tpl2 and ABIN-2 in IRAK1-null HEK-293 cells, pharmacological inhibitors (PS1145, PP2), kinase activity assays |
The Biochemical journal |
Medium |
19754427
|
| 2011 |
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. |
Affinity purification of IKKα-associated proteins, co-immunoprecipitation, proteasome inhibitor assays, kinase activity assays, site-directed mutagenesis (S146), NF-κB reporter assays |
The Journal of biological chemistry |
Medium |
21784860
|
| 2015 |
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. |
Co-immunoprecipitation, deubiquitination assay, overexpression and knockdown, NF-κB reporter assays, in vivo xenograft |
Oncotarget |
Medium |
26348204
|
| 2016 |
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. |
X-ray crystallography, mutagenesis, pull-down assays, isothermal titration calorimetry (ITC) |
Structure |
High |
27916521
|
| 2016 |
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. |
MudPIT/Halo Affinity Purification Mass Spectrometry (AP-MS), deletion and point mutant mapping, RNA-Seq of TNIP2-associated RNAs, RNA depletion experiments |
Molecular & cellular proteomics |
Medium |
27609421
|
| 2017 |
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. |
Tandem affinity purification coupled with mass spectrometry (TAP-MS), protein-fragment complementation assay, bioluminescent resonance energy transfer (BRET), recombinant rabies viruses in mice |
PLoS pathogens |
High |
29084252
|
| 2018 |
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. |
Knock-in mouse (ABIN2[D310N]), DSS colitis model, bone marrow transplantation, MEF and intestinal myofibroblast assays, pharmacological Tpl2 inhibition, COX2/PGE2 measurement |
Journal of immunology |
High |
30355787
|
| 2018 |
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. |
Knock-in mice (kinase-dead TPL-2, Tnip2 A20-binding mutant), house dust mite (HDM) allergic airway inflammation model, TPL-2 signaling assays |
The Journal of experimental medicine |
High |
30337469
|
| 2018 |
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. |
Positional scanning peptide library, high-throughput mass spectrometry kinase assay with the tripartite complex |
The Biochemical journal |
Medium |
29229763
|
| 2006 |
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. |
Transgenic mouse overexpression, partial hepatectomy model, NF-κB nuclear translocation assay, BrdU incorporation/cell cycle analysis, RT-PCR |
Biochemical and biophysical research communications |
Medium |
16480954
|
| 2021 |
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. |
GRβ overexpression in human monocytes, siRNA knockdown of TNIP2, RT-PCR for mRNA levels |
Brain, behavior, and immunity |
Low |
33932528
|
| 2023 |
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. |
Overexpression in SH-SY5Y-APP and HEK-APP cells, Western blot for BACE1/ADAM10/C99/Aβ, luciferase 3'UTR reporter assay, mRNA stability assay |
Neuroscience letters |
Medium |
37085111
|