| 2004 |
Sts-1 (UBASH3B) negatively regulates TCR signaling; T cells from Sts-1/Sts-2 double-knockout mice are hyperresponsive with increased ZAP-70 phosphorylation (including ubiquitylated forms) and hyperactivation of downstream signaling proteins, establishing Sts-1 as a critical negative regulator of ZAP-70 in the TCR signaling pathway. |
Genetic knockout (Sts-1/Sts-2 double-knockout mice), T cell stimulation assays, immunoblot for ZAP-70 phosphorylation, cytokine production assays, EAE autoimmunity model |
Immunity |
High |
14738763
|
| 2004 |
Sts-1 (UBASH3B) binds to Cbl via its SH3 domain, binds mono-ubiquitin and the EGFR/Ub chimera via its UBA domain, is recruited into activated EGFR complexes upon ligand stimulation, and inhibits EGFR endocytosis and degradation, resulting in prolonged mitogenic signaling. |
Co-immunoprecipitation, pulldown with ubiquitin/EGFR-Ub chimera, receptor internalization assays, endocytic vesicle quantification, cell proliferation and transformation assays, dominant-negative interference |
The Journal of biological chemistry |
High |
15159412
|
| 2007 |
Sts-1 (UBASH3B) is a phosphatase belonging to the phosphoglycerate mutase/acid phosphatase (PGM/AcP) histidine phosphatase superfamily; its C-terminal domain dephosphorylates ZAP-70 in vitro, and point mutations inactivating its phosphatase activity also impair its ability to suppress TCR signaling in T cells. |
X-ray crystallography of Sts-1 C-terminal domain, in vitro phosphatase assay with ZAP-70, active-site mutagenesis (key catalytic residues), TCR signaling assays in T cells with phosphatase-dead mutants |
Molecular cell |
High |
17679096
|
| 2007 |
The C-terminal PGM-homology domain of Sts-1 (UBASH3B) catalyzes hydrolysis of ecdysteroid and steroid phosphates, confirming broad histidine phosphatase activity; the domain is structurally and functionally related to insect ecdysteroid phosphate phosphatase (EPP). |
Molecular modeling, cloning and expression of human Sts-1 PGM domain and Drosophila EPP, in vitro phosphatase activity assay with ecdysteroid/steroid phosphate substrates |
Proteins |
Medium |
17348005
|
| 2010 |
TULA-2 (UBASH3B) is expressed in platelets, physically associates with Syk, dephosphorylates Syk, and negatively regulates GPVI signaling; TULA-2-knockout mice show hyperphosphorylation of Syk and PLC-γ2, enhanced GPVI-mediated platelet responses, shorter bleeding times, and a prothrombotic phenotype. |
Co-immunoprecipitation (TULA-2 with Syk), in vitro dephosphorylation assay, genetic knockout mice, platelet aggregation/activation assays, immunoblot for Syk/PLC-γ2 phosphorylation, bleeding time measurement |
Blood |
High |
20585042
|
| 2010 |
TULA-2 (UBASH3B) shows defined substrate specificity for phosphotyrosyl peptides: class I substrates have Pro at pY-1 and hydrophilic residue at pY-2; class II substrates have acidic residues at pY-1 to pY-3. TULA-2 is highly active toward Syk pY323 and pY352 sites; in GPVI-stimulated TULA-2-KO platelets, Syk Y323 and Y352 phosphorylation is significantly elevated, confirming Syk as a bona fide substrate. |
Combinatorial phosphotyrosyl peptide library screening, kinetic analysis of representative peptides, TULA-2 knockout platelets with immunoblot for site-specific Syk phosphorylation |
The Journal of biological chemistry |
High |
20670933
|
| 2012 |
TULA-2 (UBASH3B) is recruited to tyrosine-phosphorylated Syk C-terminal tail peptides in mast cells, is present in complexes with Syk after FcεRI activation, and siRNA-mediated knockdown of TULA-2 increases Syk activation-loop phosphorylation, PLC-γ2 phosphorylation, degranulation, and NF-κB/NFAT activation, establishing TULA-2 as a negative regulator of FcεRI signaling. |
Phosphopeptide pulldown from mast cell lysates, mass spectrometry identification, immunoprecipitation, far-Western blot, siRNA knockdown, degranulation assay, immunoblot |
The Journal of biological chemistry |
High |
22267732
|
| 2012 |
TULA-2 (UBASH3B) is the only family member expressed in osteoclasts and negatively regulates osteoclast differentiation and function; its absence increases Syk phosphorylation at Y352 and Y525/526, activates PLC-γ2 downstream of ITAM signaling, and a phosphatase-dead TULA-2 mutant increases osteoclast function, confirming the mechanism requires phosphatase activity. |
Genetic double-knockout mice (DKO), skeletal analysis, in vitro osteoclast differentiation assays, immunoblot for Syk and PLC-γ2 phosphorylation, phosphatase-dead TULA-2 overexpression |
Cellular and molecular life sciences |
High |
23149425
|
| 2013 |
UBASH3B dephosphorylates CBL ubiquitin ligase, inactivating it and leading to EGFR stabilization and up-regulation; this phosphatase activity is required for the invasive and metastatic phenotype of triple-negative breast cancer cells, and UBASH3B is a direct functional target of miR-200a. |
Knockdown/overexpression of UBASH3B in TNBC cells, in vitro phosphatase assay with CBL as substrate, immunoblot for CBL phosphorylation and EGFR levels, invasion/migration assays, xenograft models, phosphatase-dead mutant analysis |
Proceedings of the National Academy of Sciences of the United States of America |
High |
23784775
|
| 2013 |
Substrate-trapping variants of Sts-1 (UBASH3B), generated by mutagenesis of the nucleophilic His380 and general acid Glu490 in the histidine phosphatase active site, bind with high affinity to tyrosine-phosphorylated ZAP-70 from activated T cell lysates, validating ZAP-70 as a direct substrate of the Sts-1 phosphatase active site; vanadate competition confirms substrate trapping occurs through the active site. |
Active-site mutagenesis (H380, E490), substrate-trapping pulldown from T cell lysates, immunoblot for phospho-ZAP-70, vanadate competition assay, T cell signaling assay with overexpressed trapping mutants |
The FEBS journal |
High |
24256567
|
| 2015 |
UBASH3B/Sts-1 is upregulated by AML1-ETO through transcriptional and miR-9-mediated regulation; UBASH3B depletion induces aberrant CBL phosphorylation and impairs proliferation of AML1-ETO cells; this growth inhibition is rescued by CBL mutants, demonstrating that UBASH3B supports AML1-ETO leukemia cell growth partly by modulating CBL phosphorylation state. |
shRNA depletion of UBASH3B, ectopic expression of CBL mutants (rescue experiment), immunoblot for CBL phosphorylation, proliferation assays, xenograft model, transcriptional analysis |
Leukemia |
Medium |
26449661
|
| 2015 |
STS-1 (UBASH3B) promotes IFN-α-induced autophagy in B cells by inhibiting CBL phosphorylation, thereby de-repressing TYK2 phosphorylation and enhancing JAK1-STAT1 signaling; JAK1 and STAT1 inhibitors block the STS-1-promoted autophagy, placing STS-1 upstream of JAK1-STAT1 in this pathway. |
Overexpression and knockdown of STS-1 in B cells, immunoblot for CBL/TYK2/JAK1/STAT1 phosphorylation, autophagy assays (LC3 conversion), pharmacological inhibition of JAK1/STAT1 |
European journal of immunology |
Medium |
25959715
|
| 2016 |
UBASH3B acts as a ubiquitin receptor that interacts with ubiquitylated Aurora B and controls Aurora B subcellular localization (recruitment to mitotic microtubules prior to anaphase) without affecting Aurora B protein levels; this activity is required for timely and faithful chromosome segregation in human cells. |
Co-immunoprecipitation of UBASH3B with ubiquitylated Aurora B, live-cell imaging of Aurora B localization, loss-of-function (siRNA/KO), gain-of-function, chromosome segregation fidelity assays |
Developmental cell |
High |
26766443
|
| 2016 |
TULA-2 (UBASH3B) suppresses Syk activation through GPVI-FcRγ largely by dephosphorylating Syk Tyr346 (regulatory site phosphorylated early after receptor ligation) with high efficiency; it is less efficient at other Syk regulatory sites, identifying Tyr346 dephosphorylation as a key checkpoint in the TULA-2-mediated control of Syk. |
In vitro phosphatase assay with site-specific phospho-Syk peptides and proteins, TULA-2-knockout platelet immunoblot for pY346-Syk, GPVI-stimulated platelet signaling assays |
The Journal of biological chemistry |
High |
27609517
|
| 2016 |
TULA-2 (UBASH3B) negatively regulates FcγRIIA signaling in platelets; TULA-2 knockout in FcγRIIA-transgenic mice causes hyperphosphorylation of Syk, LAT, and PLC-γ2, enhanced platelet aggregation/secretion/PS exposure, aggravated thrombocytopenia, and augmented thrombin generation in a HIT model; even heterozygous (50%) reduction of TULA-2 significantly increases platelet reactivity. |
Genetic KO crossed with FcγRIIA-transgenic mice, immunoblot for phospho-Syk/LAT/PLCγ2, platelet functional assays, HIT mouse model (antibody-mediated thrombocytopenia), bleeding time |
Arteriosclerosis, thrombosis, and vascular biology |
High |
27765766
|
| 2017 |
X-ray crystal structures of the histidine phosphatase domains of human Sts-1 and Sts-2 were determined (unliganded Sts-1HP at 2.5 Å, Sts-1HP/sulfate at 1.9 Å, Sts-2HP/sulfate at 2.4 Å); steady-state kinetics show Sts-1HP has significantly higher phosphatase activity than Sts-2HP; Sts-1HP kinetics mirror full-length Sts-1, confirming it is a functional surrogate; PHPS1 (SHP-1 inhibitor) inhibits Sts-1 with Ki = 1.05 μM; human Sts-1 dephosphorylates ZAP-70 in a cell-based assay. |
X-ray crystallography, steady-state kinetic analysis, full-length vs. isolated domain activity comparison, inhibitor Ki determination, cell-based ZAP-70 dephosphorylation assay |
Biochemistry |
High |
28759203
|
| 2017 |
STS-1 (UBASH3B) interacts with ShcA via a phosphotyrosine-dependent interaction, and this interaction is regulated by EGF receptor activation. |
Phosphotyrosine-containing peptide affinity pulldown from cell lysates, immunoblot for STS-1, EGF stimulation-dependent comparison |
Biochemical and biophysical research communications |
Low |
28690151
|
| 2018 |
TULA-2 (UBASH3B) deficiency enhances platelet aggregation, secretion, thromboxane production, and kinetics of signaling downstream of the CLEC-2 (HemITAM) receptor; TULA-2 knockout platelets show enhanced Syk Y346 phosphorylation and downstream PLCγ2/SLP-76 phosphorylation, demonstrating that TULA-2 negatively regulates CLEC-2 signaling by dephosphorylating Syk Y346. |
TULA-2 knockout mice, platelet aggregation/secretion assays, immunoblot for pY346-Syk/pPLCγ2/pSLP-76, thromboxane ELISA, stimulation with CLEC-2 antibody and rhodocytin |
TH open |
Medium |
31249969
|
| 2020 |
In endothelial cells, TULA-2 (UBASH3B) interacts with SYK and suppresses SYK Y323 phosphorylation; loss of TULA-2 (via miR-25-3p targeting) leads to increased SYK Y323 phosphorylation, which elevates VEGFR-2 Y1175 phosphorylation and promotes angiogenesis. |
miR-25-3p overexpression/inhibition, immunoblot for TULA-2/pSYK Y323/pVEGFR-2 Y1175, co-immunoprecipitation of TULA-2 with SYK, in vitro angiogenesis assays, hindlimb ischemia mouse model |
Aging |
Medium |
33201836
|
| 2021 |
UBASH3B (Ubash3b) is induced by TPA treatment and promotes dephosphorylation and subsequent proteasomal degradation of PKCδ protein; RNAi-mediated depletion of Ubash3b blocks TPA-induced PKCδ degradation, establishing Ubash3b as an upstream regulator of PKCδ protein stability through dephosphorylation. |
TPA treatment, RNAi knockdown of Ubash3b, immunoblot for PKCδ phosphorylation and protein levels, proteasome inhibition experiment (ALLN), mouse leukemia model |
Biochimie |
Medium |
33556471
|
| 2024 |
UBASH3B directly binds MRPL12 and dephosphorylates MRPL12 at tyrosine 60 (Y60); loss of Y60 phosphorylation impedes MRPL12 binding to mitochondrial RNA polymerase (POLRMT), downregulating mitochondrial oxidative phosphorylation and inhibiting LUAD tumor progression. |
Mass spectrometry identification of MRPL12 Y60 phosphorylation, Co-immunoprecipitation of UBASH3B with MRPL12, in vitro dephosphorylation assay, Y60 mutation analysis (Y60F), POLRMT interaction assay, in vivo LUAD mouse model and patient-derived organoids |
Journal of experimental & clinical cancer research |
Medium |
39343960
|