| 1992 |
YWHAZ (14-3-3ζ, KCIP-1) is a potent inhibitor of protein kinase C (PKC) isolated from sheep brain; it consists of multiple isoforms with acetylated N-termini, adopts a predominantly alpha-helical amphipathic structure, and four isoforms serve as PKC substrates in vitro (phosphorylated by PKC itself), but it does not inhibit the isolated catalytic fragment of PKC (PKM) nor cAMP-dependent kinase, CaM kinase II, or casein kinase 2. |
Reverse-phase HPLC isoform separation, direct protein sequencing, in vitro kinase assays, secondary structure prediction |
European journal of biochemistry |
High |
1317796
|
| 1996 |
14-3-3ζ binds signaling proteins through specific recognition of phosphoserine-containing motifs; phosphoserine is necessary and sufficient for binding, and phosphopeptides based on the Raf-1 binding motif can disrupt 14-3-3 complexes and inhibit Xenopus oocyte maturation. |
Phosphopeptide binding assays, co-immunoprecipitation disruption, Xenopus oocyte maturation assay |
Cell |
High |
8601312
|
| 1995 |
14-3-3ζ self-assembles into dimers via its amino-terminal sequences, while Raf-1 binding requires the carboxy-terminal ~100 amino acids; 14-3-3ζ acts as an arachidonate-selective acyltransferase/putative phospholipase A2; it binds both active and inactive Raf in situ, and truncated forms that bind Raf are only recovered with inactive Raf, indicating 14-3-3ζ participates in the Raf activation process. |
Baculoviral recombinant protein binding, yeast two-hybrid, deletion analysis, co-purification from Sf9 cells, COS cell co-expression |
The Journal of biological chemistry |
High |
7559537
|
| 1997 |
The crystal structure of 14-3-3ζ complexed with a phosphoserine motif from polyoma middle-T antigen (2.6 Å resolution) reveals an extended peptide conformation with a tight turn at the pS+2 Pro residue; two consensus binding motifs (RSXpSXP and RXY/FXpSXP) were identified using phosphoserine-oriented peptide libraries; the 14-3-3ζ dimer binds tightly to molecules containing tandem phosphoserine motifs via bidentate association. |
X-ray crystallography (2.6 Å), phosphoserine-oriented peptide library screening, ITC binding measurements |
Cell |
High |
9428519
|
| 1997 |
14-3-3ζ binds directly to the Raf-1 cysteine-rich domain (CRD, residues 139–184); mutation of Raf-1 residues 143–145 impairs 14-3-3ζ binding but not Ras binding to the CRD; introduction of these mutations produces full-length Raf-1 mutants with enhanced transforming activity, demonstrating that 14-3-3ζ interaction with the Raf-CRD negatively regulates Raf-1 function. |
Direct binding assays with isolated CRD, site-directed mutagenesis, transformation assays |
The Journal of biological chemistry |
High |
9261098
|
| 1997 |
In Drosophila, 14-3-3ζ (D14-3-3ζ) is an essential component of the Ras/Raf/MAPK signaling pathway required for photoreceptor differentiation; it acts upstream of Raf and downstream of Ras, as shown by genetic epistasis with gain-of-function Raf and Ras alleles; it localizes apically in differentiating photoreceptor cells. |
Drosophila genetic epistasis (mutant analysis + gain-of-function rescue), in situ hybridization, immunolocalization |
Genes & development |
High |
9159395
|
| 1997 |
14-3-3ζ binds to the carboxyl half of mouse Wee1 kinase; this interaction occurs in vitro and in COS-1 cells (co-immunoprecipitation); the Wee1 kinase phosphorylated by Cdc2 also binds 14-3-3ζ; both the kinase domain and a C-terminal sequence of Wee1 are required for binding. |
Yeast two-hybrid, in vitro binding with recombinant proteins, co-immunoprecipitation in COS-1 cells, deletion analysis |
Biochemical and biophysical research communications |
Medium |
9016762
|
| 1998 |
14-3-3ζ binds to discrete amino acid sequences within the cytoplasmic domain of the platelet glycoprotein Ib-IX-V complex: the C-terminal GHSL sequence of GPIbα, the central GPIbα region (Arg557–Gly575), and sequences in GPIbβ and GPV; phosphorylation of GPIbβ at Ser166 (a PKA site) enhances 14-3-3ζ binding ~8-fold, suggesting phosphorylation-regulated association. |
Peptide binding assay with radiolabeled 14-3-3ζ, alanine-walking mutagenesis, immunoprecipitation from platelet extracts, peptide competition |
Biochemistry |
High |
9425086
|
| 1995 |
14-3-3ζ differentially activates PKC isoforms: classical PKC isoforms are activated ~2-fold, PKCδ shows no significant activation, and PKCε is highly activated with strong positive cooperativity (Hill coefficient ~6.1), indicating isoform-specific regulation of PKC by 14-3-3ζ. |
In vitro PKC activity assay with purified 14-3-3ζ and purified PKC isoforms |
Biochemical and biophysical research communications |
Medium |
7488074
|
| 1999 |
The conserved basic residues lining the amphipathic groove of 14-3-3ζ are required for activation of Pseudomonas aeruginosa ExoS ADP-ribosyltransferase, whereas hydrophobic residues of the groove are less critical; Val176 (required for Raf-1 interaction) is dispensable for ExoS binding and activation, demonstrating selective use of groove residues for different client proteins. |
Site-directed mutagenesis of 14-3-3ζ groove residues, in vitro ExoS ADP-ribosyltransferase activity assay, binding assays |
Biochemistry |
High |
10508420
|
| 1999 |
Akt phosphorylates the Forkhead transcription factor FKHRL1, leading to its association with 14-3-3 proteins (including 14-3-3ζ) and cytoplasmic retention; survival factor withdrawal leads to dephosphorylation, nuclear translocation, and target gene (e.g., Fas ligand) activation, establishing 14-3-3ζ as a cytoplasmic anchor that sequesters phospho-FKHRL1 downstream of Akt. |
Co-immunoprecipitation, subcellular fractionation, reporter gene assays, dominant-negative Akt, phospho-specific antibodies |
Cell |
High |
10102273
|
| 2003 |
14-3-3ζ interacts with cofilin and LIMK1 via consensus 14-3-3 binding sites identified by deletion analysis; 14-3-3ζ co-sedimentation experiments show its C-terminal region inhibits cofilin binding to actin; upon co-transfection, 14-3-3ζ redistributes into LIMK1-induced actin aggregations, linking 14-3-3ζ to actin cytoskeletal reorganization. |
Yeast two-hybrid, GST pull-down, deletion analysis, co-sedimentation with actin, co-transfection and immunofluorescence in COS-7 cells |
The Biochemical journal |
High |
12323073
|
| 2003 |
14-3-3ζ mediates integrin-induced activation of Cdc42 and Rac1 in CHO cells; GP Ibα expression sequesters 14-3-3ζ via its cytoplasmic domain, blocking integrin-induced Rho GTPase activation and cell spreading; re-expression of 14-3-3ζ restores these responses, identifying 14-3-3ζ as a mediator of integrin-to-Rho GTPase signaling. |
CHO cell expression of GP Ibα constructs, Rho GTPase activation assays, cytoskeletal staining, cell spreading assay, rescue by 14-3-3ζ overexpression |
The Journal of biological chemistry |
High |
12810725
|
| 2003 |
Three subclasses of PKC (classical, novel, atypical) all interact with 14-3-3ζ in the rodent brain; the PKC/14-3-3ζ complex pool (1–4% of each PKC isoform) displays constitutive, autonomous, Ca2+-independent kinase activity; C1 domain of PKC is involved in 14-3-3ζ binding, and the interaction is at least partially phosphorylation-independent. |
Co-immunoprecipitation from rodent brain, PKC activity assay of immunoprecipitate, Western blotting |
Journal of neurochemistry |
Medium |
12485398
|
| 2004 |
14-3-3ζ has a higher nuclear fraction than 14-3-3σ in mammalian cells; FRAP experiments demonstrate both isoforms rapidly shuttle between nucleus and cytoplasm via active transport; 14-3-3σ has a 1.7× higher nuclear export rate constant (Crm1/leptomycin B-sensitive), establishing that isoform-specific subcellular distribution arises from differential nuclear export kinetics. |
YFP fusion live-cell imaging, isoform-specific antibody immunostaining, FRAP, leptomycin B treatment |
Journal of cell science |
High |
14996909
|
| 2005 |
AMPK phosphorylates raptor on two conserved serine residues, inducing 14-3-3 binding to raptor; this 14-3-3 association is required for energy stress-induced mTORC1 inhibition and cell-cycle arrest, placing 14-3-3ζ as a mediator of AMPK-dependent mTORC1 pathway suppression. |
In vitro AMPK kinase assay, phospho-site mutagenesis, co-immunoprecipitation of 14-3-3/raptor, cell-cycle analysis under energy stress |
Molecular cell |
High |
18439900
|
| 2005 |
ERK-mediated hyperphosphorylation of Raf-1 at six feedback sites (five proline-directed ERK sites) desensitizes Raf-1; re-sensitization requires PP2A dephosphorylation and Pin1 prolyl isomerase; 14-3-3 interaction with Raf-1 is modulated by this feedback phosphorylation cycle, contributing to precise temporal control of Ras signaling. |
Phospho-site mapping by MS, site-directed mutagenesis, PP2A and Pin1 interaction assays, Raf-1 kinase activity measurements |
Molecular cell |
High |
15664191
|
| 2007 |
AKT phosphorylates β-catenin at Ser552, causing its dissociation from cell-cell contacts and accumulation in cytosol/nucleus; phospho-Ser552 β-catenin interacts with 14-3-3ζ via a binding motif containing Ser552, enhancing β-catenin transcriptional activity and tumor cell invasion. |
In vitro kinase assay, phospho-specific antibodies, co-immunoprecipitation, invasion assay, mutagenesis of Ser552 |
The Journal of biological chemistry |
High |
17287208
|
| 2007 |
14-3-3ζ knockdown in mammalian cells sensitizes cells to stress-induced apoptosis and activates JNK/p38 signaling; it also enforces cell-cell contacts and upregulates adhesion proteins, demonstrating isoform-specific oncogenic activities: restraining apoptosis propensity and cell adhesion. |
siRNA knockdown, apoptosis assays, JNK/p38 signaling readout, cell adhesion assays, Oncomine meta-analysis |
Oncogene |
Medium |
17704798
|
| 2008 |
14-3-3ζ overexpression in MCF10A cells activates the PI3K/Akt pathway leading to MDM2 phosphorylation and nuclear translocation, which increases p53 degradation and resistance to anoikis; ectopic p53 expression restores luminal apoptosis, placing 14-3-3ζ upstream of the Akt/MDM2/p53 axis in mammary epithelial architecture. |
3D Matrigel culture, transgenic mouse MECs, siRNA/overexpression, Western blot for phospho-MDM2/p53 levels, anoikis assays, p53 rescue |
Cancer research |
High |
18339856
|
| 2008 |
SIRT2 negatively regulates 14-3-3ζ levels; SIRT2 knockdown induces 14-3-3ζ expression, which facilitates cytosolic sequestration of BAD (reducing mitochondrial BAD), thereby protecting H9c2 cells from anoxia-reoxygenation injury; concurrent knockdown of both SIRT2 and 14-3-3ζ abolishes the cytoprotective phenotype. |
siRNA double knockdown, gene array, subcellular fractionation of BAD, anoxia-reoxygenation injury assay |
FEBS letters |
Medium |
18640115
|
| 2008 |
Depletion of 14-3-3ζ in mouse hippocampal cultures induces ER stress markers (KDEL-containing proteins, calnexin upregulation) and granule cell death; 14-3-3ζ levels increase in the microsomal/ER-containing fraction upon ER stress (tunicamycin) or excitotoxicity (kainic acid); 14-3-3ζ knockdown exacerbates kainic acid-induced damage in all hippocampal subfields. |
siRNA knockdown in organotypic cultures, subcellular fractionation, Western blot for ER stress markers, kainic acid injury assay |
Journal of neurochemistry |
Medium |
18466333
|
| 2010 |
14-3-3ζ overexpression negatively modulates TGF-β1-mediated growth inhibition; it increases linker-phosphorylated Smad3 (which cannot mediate growth arrest); mutation of 14-3-3ζ phosphorylation sites on Smad3 rescues TGF-β1-induced p15 promoter activity and cell-cycle arrest, identifying Smad3 as a critical functional target of 14-3-3ζ in TGF-β resistance. |
siRNA/overexpression, Smad3 phosphorylation site mutagenesis, p15 promoter-reporter assay, cell-cycle analysis |
Molecules and cells |
Medium |
20082218
|
| 2011 |
miR-451 suppresses Ywhaz expression through its 3'UTR and this suppression mediates downregulation of p38 MAPK signaling; miR-451 overexpression inhibits glomerular mesangial cell proliferation in vitro and in vivo through this Ywhaz/p38 MAPK axis. |
Luciferase 3'UTR reporter assay, Western blot, in vitro proliferation assay, in vivo mesangial cell model |
FEBS letters |
Medium |
21827757
|
| 2011 |
Fusicoccin-based fluorescent probes form ternary complexes with 14-3-3ζ and phosphopeptide ligands and site-specifically attach a fluorescent tag onto the surface of 14-3-3ζ proteins in a phosphopeptide-dependent manner, revealing the ligand-binding interface. |
Chemical biology/affinity labeling with cell-penetrating diterpene probes, fluorescence readout |
Angewandte Chemie (International ed. in English) |
Medium |
22105970
|
| 2011 |
Lacosamide (an antiepileptic drug) binds to 14-3-3ζ in rodent brain lysates in a stereospecific, xanthine-dependent manner; the adduction site was mapped to K120 by MS; competition experiments confirm (R)-lacosamide and the affinity probe share the same binding site on 14-3-3ζ; xanthine interaction with 14-3-3ζ was confirmed by isothermal calorimetry. |
Affinity bait/chemical reporter strategy, LC-MS/MS adduction site mapping, competition binding, isothermal calorimetry |
Journal of the American Chemical Society |
Medium |
21692503
|
| 2012 |
YWHAZ promotes epithelial-mesenchymal transition (EMT) and lung cancer metastasis through interaction with β-catenin: YWHAZ binds β-catenin, protects it from β-TrCP-mediated ubiquitination and proteasomal degradation, and promotes its cytosolic/nuclear accumulation and transcriptional activity; S552-phosphorylated β-catenin shows enhanced YWHAZ complex formation; knockdown reverses EMT. |
Co-immunoprecipitation, ubiquitination assay, dominant-negative/positive β-catenin mutants, shRNA knockdown, in vivo metastasis model |
Molecular cancer research : MCR |
High |
22912335
|
| 2013 |
14-3-3ζ interacts with the cytoplasmic tails of α4, β1, β2, and β3 integrin subunits; X-ray crystallography of the 14-3-3ζ/α4 complex (canonical phosphopeptide-binding mode) reveals residues outside the consensus motif are essential for efficient interaction; a short β2 phospho-peptide alone is sufficient for high-affinity binding; the β1A integrin tail shows the strongest interaction; novel phosphorylation-independent interactions are also identified. |
X-ray crystallography, NMR, surface plasmon resonance, isothermal titration calorimetry, mutagenesis |
Journal of molecular biology |
High |
23763993
|
| 2014 |
YWHAZ transcription is regulated by a functional CRE element in the proximal promoter of the predominant transcript variant (1c); ATF-1 (and, to a lesser extent, CREB) bind the endogenous YWHAZ promoter especially under TNF-α stimulation; ATF-1 silencing markedly reduces two of five YWHAZ transcript variants. |
5'RACE, EMSA, chromatin immunoprecipitation (ChIP), promoter-reporter assay, ATF-1 siRNA, EST database mining |
PloS one |
Medium |
24690670
|
| 2014 |
14-3-3ζ depletion in glioblastoma cells induces cellular senescence through p27 accumulation caused by impaired SKP2-mediated ubiquitin degradation of p27; the mechanism involves loss of STAT3 solubility (increased insoluble STAT3 fraction); ectopic 14-3-3ζ blocks BIS-depletion-induced senescence with parallel decrease in insoluble STAT3, placing 14-3-3ζ in the BIS/14-3-3ζ/STAT3/SKP2/p27 senescence pathway. |
siRNA/shRNA knockdown, senescence assays (SA-β-gal), Western blot of soluble/insoluble fractions, ectopic overexpression rescue, Bis-KO mouse embryonic fibroblasts |
Cell death & disease |
Medium |
25412315
|
| 2016 |
14-3-3ζ participates in TLR3-mediated signaling by promoting TICAM-1 multimerization: 14-3-3ζ knockdown reduces type I interferon and inflammatory cytokine production, blocks IRF3 nuclear translocation, and inhibits TICAM-1 multimer formation after TLR3 ligand stimulation. |
siRNA knockdown, TICAM-1 multimerization assay (native gel), IRF3 nuclear translocation assay, cytokine ELISA, IκB phosphorylation |
Molecular immunology |
Medium |
27058640
|
| 2016 |
14-3-3ζ downregulation in trabecular meshwork (TM) cells decreases MLC and cofilin phosphorylation, reduces stress fiber and focal adhesion formation, alters ECM composition (fibronectin/collagen mRNA), and inhibits TGF-β1-induced cell contraction; this is mediated through direct reduction of total RhoA levels, placing 14-3-3ζ upstream of RhoA in actomyosin regulation. |
siRNA knockdown, Western blot (phospho-MLC, phospho-cofilin, RhoA), immunofluorescence, collagen gel contraction assay, qRT-PCR |
Investigative ophthalmology & visual science |
Medium |
26906158
|
| 2016 |
Ywhaz knockout mice display elevated fasting GLP-1 levels and improved oral glucose tolerance; 14-3-3ζ knockdown in GLUTag L cells elevates GLP-1 synthesis and release; systemic GLP-1 receptor inhibition abolishes the improved oral glucose tolerance of knockout mice, demonstrating that 14-3-3ζ negatively regulates GLP-1 production in intestinal L cells. |
Whole-body Ywhaz KO mouse, oral vs. IP glucose tolerance test, GLP-1 ELISA, siRNA in GLUTag cells, GLP-1R antagonist rescue |
Endocrinology |
High |
27167773
|
| 2019 |
A gain-of-function YWHAZ variant (S230W) associated with CFC syndrome activates the RAF-ERK pathway: it binds more Raf protein than wild-type YWHAZ, enhances Raf-stimulated ERK phosphorylation, induces severe embryonic defects in Xenopus more efficiently than wild type, rescues dominant-negative FGF receptor defects more potently, and escapes phosphorylation by casein kinase 1a. |
Xenopus laevis ectopic expression, embryo phenotype scoring, dominant-negative FGF receptor rescue assay, co-immunoprecipitation of Raf, ERK phosphorylation Western blot, casein kinase 1a phosphorylation assay |
Frontiers in physiology |
Medium |
31024343
|
| 2020 |
PPD (20(S)-protopanaxadiol, a ginsenoside metabolite) directly binds to 14-3-3ζ; co-crystal structure reveals main interactions at R56, R127, and Y128 of 14-3-3ζ; mutagenesis of any of these residues significantly decreases PPD affinity, identifying a dammarane-type triterpenoid binding site on the protein surface. |
Affinity chromatography, biolayer interferometry (BLI), isothermal titration calorimetry (ITC), X-ray co-crystallography, site-directed mutagenesis |
Journal of ginseng research |
High |
34295206
|
| 2021 |
YWHAZ interacts with and colocalizes with DAAM1 in breast cancer cells; this YWHAZ-DAAM1 complex is essential for DAAM1-mediated microfilament remodeling and RhoA activation; miR-613 directly targets both YWHAZ and DAAM1, inhibiting breast cancer cell migration by disrupting the YWHAZ-DAAM1 complex. |
Co-immunoprecipitation, co-localization (immunofluorescence), RhoA activation assay, miR-613 mimic transfection, migration assay |
Cell death discovery |
Medium |
34453038
|
| 2021 |
PIM1 phosphorylates 14-3-3ζ as an endogenous substrate in prostate cancer cells; PIM1 phosphorylation of both the androgen receptor (AR) at S213 and 14-3-3ζ coordinates their interaction; the AR/14-3-3ζ complex extensively co-occupies chromatin sites and recruits co-regulators (hnRNPK, TRIM28) to drive PIM1-dependent transcription of cell migration/invasion genes. |
In vitro PIM1 kinase assay, co-immunoprecipitation, ChIP-seq/ChIP, RIME (rapid immunoprecipitation and MS of endogenous proteins), gene expression analysis |
Communications biology |
High |
34697370
|
| 2021 |
TRIM21 E3 ligase interacts with YWHAZ (identified by Co-IP/LC-MS/MS and validated by BIFC); TRIM21 negatively regulates YWHAZ protein levels via its RING domain (E3 ligase activity), promoting ubiquitin-mediated degradation of YWHAZ. |
Co-immunoprecipitation coupled with LC-MS/MS, bimolecular fluorescence complementation (BIFC), TRIM21-ΔRING mutant, Western blot |
Biomedical and environmental sciences : BES |
Medium |
29673441
|
| 2022 |
ywhaz deficiency in zebrafish alters neuronal activity and connectivity in the hindbrain; adult ywhaz KO fish have decreased monoamine levels in the hindbrain and display a freezing phenotype to novel stimuli that is reversed by drugs targeting monoamine neurotransmission, establishing a role for ywhaz in establishing neuronal connectivity and modulating monoaminergic neurotransmission. |
CRISPR/Cas9 KO zebrafish, whole-brain light-sheet imaging, monoamine HPLC measurements, behavioral assays, pharmacological rescue |
Molecular psychiatry |
Medium |
35501409
|
| 2022 |
YBX1 cooperates with the m6A reader IGF2BPs to stabilize YWHAZ mRNA in an m6A-dependent manner; YBX1 deletion decreases YWHAZ expression by accelerating mRNA decay; restoration of YWHAZ rescues proliferation and survival defects of YBX1-deficient CML leukemia stem cells, positioning YWHAZ downstream of YBX1/m6A in LSC maintenance. |
RNA decay assay, RNA immunoprecipitation (RIP), co-immunoprecipitation (YBX1/IGF2BPs), RNA sequencing, flow cytometry, rescue overexpression |
Cellular oncology |
Medium |
36512307
|
| 2022 |
14-3-3ζ mediates the effect of β-cell GLP-1R agonist signaling on α cell proglucagon processing; a secreted protein factor regulated by 14-3-3ζ in islets mediates paracrine cross-talk; α cell ablation blunts liraglutide-enhanced GSIS, and 14-3-3ζ in α cells regulates GLP-1 production from proglucagon. |
α-cell ablation mouse model, 14-3-3ζ knockdown in islets, GLP-1 secretion assay, liraglutide treatment, GLP-1R antagonist |
Science advances |
Medium |
35867787
|
| 2024 |
TMEM65 directly binds YWHAZ in the cytoplasm and inhibits ubiquitin-mediated degradation of YWHAZ; TMEM65 exerts oncogenic effects through activation of the PI3K-Akt-mTOR pathway via YWHAZ; TMEM65 oncogenic activity is partly dependent on YWHAZ as shown by rescue experiments. |
Co-immunoprecipitation, Western blot (ubiquitination), siRNA rescue, PI3K-Akt-mTOR pathway phosphorylation analysis, xenograft model |
Oncogene |
Medium |
38341472
|