| 1997 |
MKK7 was cloned and identified as a novel MAPKK that specifically activates SAPK/JNK but not p38; it directly phosphorylates and activates JNK/SAPK and is activated by TNFα and environmental stresses; it is the mammalian homolog of Drosophila Hemipterous (Hep) and is activated downstream of Rac1 GTPase |
Molecular cloning, immunochemical studies, in vitro kinase assay, overexpression in fibroblasts, column fractionation |
The EMBO journal / The Journal of biological chemistry |
High |
9312105 9384583
|
| 1997 |
Human JNKK2 (MKK7) is a highly specific JNK kinase that does not activate p38, distinguishing it from JNKK1/MKK4 |
Molecular cloning, co-expression kinase assays in mammalian cells |
Molecular and cellular biology |
High |
9372971
|
| 1997 |
MKK7 (but not SEK1/MKK4) is activated by Fas stimulation and mediates JNK/SAPK activation in the Fas apoptotic pathway; MKK6 (not MKK7) is the major activator of p38 in Fas signaling |
Immune-complex kinase assay, peptide inhibitor studies in Jurkat and KB cells |
The Journal of cell biology |
High |
9362518
|
| 1997 |
MKK7 is the specific activator of JNK/SAPK (not p38 or ERK) stimulated by IL-1 in rabbit liver; purified by S Sepharose chromatography and identified by immunoprecipitation with MKK7-specific antisera |
Biochemical purification, immunoprecipitation, kinase assay |
FEBS letters |
High |
9414114
|
| 1998 |
MKK7 plays a major role in activating SAPK/JNK in T lymphocytes; a dominant-negative MKK7 mutant abrogates transcriptional activation of the NFAT response element in the IL-2 promoter, placing MKK7 upstream of JNK in the cyclosporin A-sensitive pathway |
Dominant-negative expression, IL-2 promoter reporter assay |
The Journal of biological chemistry |
High |
9575191
|
| 1998 |
Human MKK7 is activated by IL-3, CD40 ligation, B-cell antigen receptor, FcR ligation, heat, UV, anisomycin, hyperosmolarity, TNFα, and constitutively active RAS, RAC, or CDC42; it phosphorylates and activates JNK1 but not p38 in co-expression studies |
Co-expression kinase assays, immune-complex kinase assay with endogenous MKK7 in hematopoietic cells |
The Journal of biological chemistry |
High |
9535930
|
| 1999 |
The MKK7 gene encodes six isoforms (alpha/beta/gamma × 1/2) by alternative splicing; the N-terminal extension present in MKK7beta/gamma (but not MKK7alpha) binds directly to the substrate JNK, conferring higher basal activity on beta/gamma isoforms while alpha isoforms show higher fold-induction; MKK7 isoforms localize to both cytoplasmic and nuclear compartments |
Molecular cloning, direct binding assay, comparative kinase assays, immunofluorescence |
Molecular and cellular biology |
High |
9891090
|
| 1999 |
DLK (dual leucine zipper-bearing kinase) specifically associates with, phosphorylates, and activates MKK7 in vitro and in vivo, but does not phosphorylate MKK4; DLK and MKK7 co-localize in neuronal subcellular compartments distinct from MKK4 |
In vitro kinase assay, co-immunoprecipitation, subcellular fractionation, immunocytochemistry |
The Journal of biological chemistry |
High |
10187804
|
| 1999 |
MEKK3 (and MEKK2) directly activates MKK7 in vitro by immunoprecipitate kinase assay, and coexpression of MEKK3 with MKK7 in COS-7 cells enhances MKK7 autophosphorylation and its ability to activate JNK1 |
In vitro kinase assay with immunoprecipitates, co-expression in COS-7 cells |
The Journal of biological chemistry |
High |
10347227
|
| 1999 |
JNKK2 (MKK7) fused to JNK1 creates a constitutively active kinase that phosphorylates JNK1 on both Thr183 and Tyr185, stimulates c-Jun transcriptional activity without exogenous stimulus, and localizes predominantly to the nucleus |
Fusion protein construction, immunoblotting with phospho-specific antibodies, transient transfection reporter assay, immunofluorescence |
The Journal of biological chemistry |
High |
10506143
|
| 2000 |
MKK4 shows striking preference for phosphorylating Tyr185 of JNK, while MKK7 shows striking preference for Thr183; together they synergistically activate all three JNK/SAPK1 isoforms tested in vitro |
In vitro kinase assays with phosphorylation-site-specific analysis on JNK1α1, JNK2α2, JNK3α1 |
The Biochemical journal |
High |
11062067
|
| 2000 |
MKK7 activates JNK3α1 primarily through threonine monophosphorylation (Thr183) and is largely responsible for JNK3α1 activation; MKK4 alone does not increase JNK3α1 Vmax or phosphorylation but is required for bisphosphorylation and maximal activity |
In vitro kinase assay, mass spectrometry phosphorylation mapping, kinetic analysis (Vmax, kcat, Km) |
Biochemistry |
High |
10715136
|
| 2001 |
Genetic disruption of Mkk7 alone is sufficient to prevent JNK activation by proinflammatory cytokines in mouse cells, whereas simultaneous disruption of both Mkk4 and Mkk7 is required to block stress-induced JNK activation; MKK4 preferentially phosphorylates Tyr and MKK7 preferentially phosphorylates Thr on JNK |
Targeted gene disruption in mice, in vitro phosphorylation assays, MEF cell studies |
Genes & development |
High |
11390361
|
| 2001 |
MKK7 negatively regulates growth factor and antigen receptor-induced proliferation in hematopoietic cells (T cells, B cells, mast cells); loss of MKK7 completely abolishes SAPK/JNK activation even when MKK4 is upregulated; MKK7-regulated pathway reduces cyclin D1 and increases p16INK4a |
Conditional gene targeting in mice, proliferation assays, JNK kinase assays, cell cycle analysis |
The Journal of experimental medicine |
High |
11560992
|
| 2001 |
PKCδ specifically mediates ionizing radiation-induced JNK activation through MKK7 (not MKK4) in human thyroid cells; dominant-negative PKCδ and the PKCδ inhibitor rottlerin suppress IR-induced MKK7 activation and downstream JNK/AP-1 activation |
Dominant-negative adenoviral vectors, immune-complex kinase assay for MKK4 and MKK7, pharmacological inhibition |
Oncogene |
High |
11314034
|
| 2001 |
In SEK1-deficient ES cells, stress-induced JNK activation is markedly impaired with loss of Tyr phosphorylation; MKK7alpha1 cannot phosphorylate JNK Thr unless Tyr is first phosphorylated by SEK1, while MKK7gamma2 can phosphorylate both residues; sequential phosphorylation by SEK1 (Tyr) then MKK7 (Thr) is required for synergistic JNK activation |
mkk7−/− and sek1−/− ES cell generation, co-transfection phosphorylation analysis, kinase-dead mutants, HEK293T assays |
The Journal of biological chemistry |
High |
11418587
|
| 2002 |
ZAK MAP3K activates JNK/SAPK specifically via MKK7 and not MKK4; dominant-negative MKK7 but not MKK4 attenuates ZAK-induced JNK activation |
Dominant-negative co-expression, JNK activation assay |
Biochemical and biophysical research communications |
Medium |
12220515
|
| 2002 |
SKRP1 (a dual-specificity phosphatase) interacts with MKK7 and through this interaction inactivates JNK; SKRP1 does not bind JNK directly but co-precipitates with MKK7 in vitro and in vivo without disrupting MKK7-JNK interaction |
Co-immunoprecipitation, GST pull-down, in vitro binding, JNK kinase assay, immunofluorescence co-localization |
The Journal of biological chemistry |
High |
11959861
|
| 2003 |
MKK4 and MKK7 form a stable complex with JNK in fibroblast-like synoviocytes (FLS); MKK4 co-precipitates with MKK7 and vice versa; the signalsome containing MKK4, MKK7, and JNK co-localizes in the cytoplasm and can phosphorylate c-Jun after IL-1 stimulation |
Co-immunoprecipitation, confocal microscopy, in vitro kinase assay |
Arthritis and rheumatism |
High |
13130464
|
| 2003 |
In ES cells lacking MKK7, Thr phosphorylation of JNK is lost without marked reduction in Tyr phosphorylation; SEK1 binds to JNK1 but MKK7 does not; SEK1-induced Tyr phosphorylation precedes and facilitates additional Thr phosphorylation by MKK7 |
mkk7−/− ES cells, dual phosphorylation analysis with phospho-specific antibodies, co-immunoprecipitation in 293T cells, Thr-Pro-Phe JNK mutant |
The Journal of biological chemistry |
High |
12624093
|
| 2004 |
GADD45β binds directly to MKK7 and blocks its catalytic activity, thereby linking NF-κB-mediated suppression to inhibition of JNK signaling; peptides disrupting the GADD45β/MKK7 interaction restore TNFα-induced cytotoxicity |
Co-immunoprecipitation, direct binding assay, in vitro kinase assay, peptide disruption experiments |
Nature cell biology |
High |
14743220
|
| 2004 |
MKK7 is required for G2/M cell cycle progression and its loss leads to premature senescence and G2/M arrest in MEFs; MKK7-JNK-c-Jun pathway regulates CDC2 expression; loss of c-Jun or expression of c-JunAA (JNK phosphorylation sites mutated) phenocopies MKK7 loss |
Genetic inactivation of MKK7 in mice, MEF cell cycle analysis, epistasis with c-Jun mutants, CDC2 expression analysis |
Nature cell biology |
High |
15039780
|
| 2006 |
MKK7 contains three JNK-docking (D) sites in its N-terminal domain that cooperatively mediate JNK binding; mutation of any single D-site reduces binding by 50–70%, mutation of two reduces by 80–90%, and mutation of all three reduces binding by 95%; full-length MKK7 with D1/D2 mutations shows reduced JNK activation |
Binding assays, mutagenesis, peptide competition assays, JNK kinase activity assays |
The Journal of biological chemistry |
High |
16533805
|
| 2006 |
c-FLIPL directly interacts with MKK7 in a TNFα-dependent manner and inhibits the interactions of MKK7 with MEKK1, ASK1, and TAK1, thereby selectively suppressing prolonged JNK activation; c-Flip−/− fibroblasts show prolonged JNK activation after TNFα |
Co-immunoprecipitation, c-Flip−/− fibroblasts, JNK activation assays |
The EMBO journal |
High |
17110930
|
| 2006 |
In FLS, IL-1β/TNFα-induced JNK activation and MMP-3 production depend specifically on MKK7 but not MKK4; anisomycin-induced JNK requires both MKK4 and MKK7; AP-1 binding activity and AP-1-driven gene expression are strictly MKK7-dependent after cytokine stimulation |
siRNA knockdown, in vitro JNK kinase assay, AP-1 EMSA, MMP-3 ELISA |
Arthritis and rheumatism |
High |
16802349
|
| 2007 |
GADD45β is a structured protein with predicted four-stranded β-sheet core and five α-helices; its helices α3/α4 and loops 1/2 mediate MKK7 binding; loop 1 and α4-loop 2 engage the MKK7 ATP-binding site causing conformational changes that impede catalytic function |
Structural/biophysical analysis of GADD45β, mutagenesis mapping of MKK7 interaction surfaces, in vitro kinase inhibition assay |
The Journal of biological chemistry |
High |
17485467
|
| 2008 |
GADD45β forms non-covalent homodimers in solution via predicted helices 1 and 5; it forms a large complex with MKK7 (at minimum a tetrameric MKK7-GADD45β:GADD45β-MKK7 unit); dimerization surface of GADD45β is distinct from its MKK7-binding surface |
Biophysical (CD, SEC, NMR-based), mutagenesis of dimerization interface |
Journal of molecular biology |
High |
18343408
|
| 2009 |
Oncogenic H-Ras activates a Rac1→MKK7→JNK signaling cascade that upregulates Atg5 to induce autophagic cell death; MKK7 (not MKK4) specifically mediates H-RasV12-induced JNK activation; inhibition of MKK7 by siRNA suppresses Atg5 upregulation and autophagic death |
siRNA knockdown of MKK7/MKK4, siRNA for Rac1, JNK activation assays, autophagy readouts |
Carcinogenesis |
High |
19783847
|
| 2010 |
Filamin A (and B, C) binds to MKK7 (via its N-terminal region present in MKK7γ and MKK7β but not MKK7α) and to MKK4 through different binding regions, enabling formation of an MKK4-Filamin A-MKK7 complex; Filamin A-deficient cells show impaired MKK7 activation and reduced synergistic JNK activation |
Co-immunoprecipitation, co-localization with actin stress fibers, Filamin A-deficient cells, deletion mutagenesis |
The Biochemical journal |
High |
20156194
|
| 2010 |
RASSF7 interacts with MKK7 and, together with N-Ras, promotes the phosphorylated state of MKK7 while inhibiting MKK7's ability to activate JNK; RASSF7 depletion enhances JNK activation and apoptosis; RASSF7 requires its RA domain for interaction with GTP-bound N-Ras and the anti-apoptotic response |
Co-immunoprecipitation, RNAi knockdown, JNK activation assay, apoptosis assay |
Cell death and differentiation |
High |
21278800
|
| 2011 |
Tissue-specific inactivation of MKK7 in KRas(G12D)-driven lung and NeuT-driven mammary tumors accelerates tumor onset; mechanistically MKK7 acts through JNK1 and JNK2 to couple oncogenic/genotoxic stress to p53 stability required for cell cycle arrest |
Conditional tissue-specific KO in cancer mouse models, epistasis with JNK1/JNK2, p53 stability assays |
Nature genetics |
High |
21317887
|
| 2011 |
MKK7 deletion in the nervous system (Nestin-Cre conditional KO) causes severe brain developmental defects including enlarged ventricles, reduced striatum, minimal axon tracts, and impaired axon elongation; phosphorylation of JNK substrates c-Jun, neurofilament heavy chain, MAP1B, and doublecortin is reduced; MKK7 regulates axon elongation in a cell-autonomous manner |
Conditional KO, histology, immunofluorescence, in utero electroporation, in vitro neuronal assays, electron microscopy |
The Journal of neuroscience |
High |
22090513
|
| 2011 |
Cardiomyocyte-specific deletion of MKK7 leads to heart failure under pressure overload, with increased cardiomyocyte apoptosis, elevated p53, attenuated MnSOD expression, and extensive interstitial fibrosis with upregulated TGF-β signaling |
Cardiomyocyte-specific KO mice, pressure overload model, apoptosis/fibrosis assays, Western blotting |
Journal of molecular and cellular cardiology |
High |
21284947
|
| 2012 |
TIPRL binds to MKK7 and PP2Ac, promotes their interaction, and thereby prevents prolonged MKK7 phosphorylation/JNK activation; siTIPRL combined with TRAIL causes sustained MKK7/JNK activation and apoptosis in HCC cells; confirmed by Co-IP, confocal microscopy, and GST pull-down |
Co-immunoprecipitation, GST pull-down, confocal microscopy, siRNA knockdown, JNK phosphorylation assay |
Gastroenterology |
High |
22841785
|
| 2012 |
MKK7 mRNA is localized to the growth cone where it can be translated; MKK7 is then phosphorylated in the neurite shaft as part of a DLK-MKK7-JNK1 module; this triggers MAP1b phosphorylation to regulate microtubule bundling leading to neurite elongation |
Genome-wide screen for neurite-enriched mRNAs, live cell imaging, phosphorylation assays, neurite elongation assays |
PLoS biology |
High |
23226105
|
| 2013 |
Active Rac1 negatively regulates Schwann cell differentiation through the MKK7-JNK pathway (not Raf-ERK); MKK7 activation and c-jun induction in sciatic nerves after axotomy is blocked by Rac inhibition; ErbB2/neuregulin signaling activates MKK7 to drive Schwann cell dedifferentiation |
Primary Schwann cell culture, dominant-active/negative constructs, Rac inhibition, MKK7 activation assay, microarray |
Glia |
High |
23505039
|
| 2014 |
GADD45β/MKK7 interaction is a therapeutic target in multiple myeloma; DTP3, a D-tripeptide, disrupts the GADD45β/MKK7 complex, restores MKK7 activity and JNK-mediated apoptosis, kills MM cells selectively, and ablates myeloma xenografts in mice without apparent toxicity |
Drug-target interaction assay, Co-IP disruption, kinase activity assay, cell viability assays, xenograft mouse model |
Cancer cell |
High |
25314077
|
| 2014 |
MAVS recruits MKK7 to mitochondria via its 3D domain; MKK7 then phosphorylates JNK2 (but not JNK1) to activate the apoptosis pathway during viral (Sendai virus) infection; Mkk7−/− cells fail to initiate virus-induced apoptosis |
Co-immunoprecipitation, Mkk7−/− and Jnk2−/− cells, mitochondrial fractionation, apoptosis assays, viral challenge in vivo |
PLoS pathogens |
High |
24651600
|
| 2015 |
NMR spectroscopy reveals the MKK7 regulatory N-terminal domain is intrinsically disordered with three JNK-docking sites of varying conformational propensities; crystal structure of JNK1 in complex with MKK7's second docking site reveals two different binding modes of the docking motif |
NMR spectroscopy, X-ray crystallography of JNK1-MKK7 D-site complex |
Proceedings of the National Academy of Sciences |
High |
25737554
|
| 2015 |
During T-cell activation, JNK signaling induces CELF2 expression, which promotes skipping of MKK7 exon 2; the exon 2-skipped isoform restores a JNK-docking site disrupted in the full-length isoform, enhancing MKK7-JNK activity (c-Jun phosphorylation, TNF-α upregulation), creating a positive feedback loop |
Alternative splicing analysis, siRNA, JNK activation assays, c-Jun phosphorylation, RNA-binding assay for CELF2 |
Genes & development |
High |
26443849
|
| 2015 |
The Ca2+/ASK1/MKK7/JNK2/c-Src cascade mediates DSS-induced intestinal epithelial tight junction disruption; knockdown of MKK7 or ASK1 blocks DSS-induced tight junction disruption and barrier dysfunction; recombinant JNK2 induces threonine phosphorylation and auto-phosphorylation of c-Src |
siRNA knockdown, Ca2+ depletion, in vitro kinase assay with recombinant JNK2, barrier function assay, animal model |
The Biochemical journal |
High |
25377781
|
| 2016 |
DUSP22 acts as a scaffold protein for the ASK1-MKK7-JNK signaling complex; DUSP22 selectively associates with ASK1, MKK7, and JNK1/2 but not ERK or p38; it enhances JNK phosphorylation and apoptosis independently of its phosphatase activity, displaying biphasic scaffold behavior |
Co-immunoprecipitation, mutagenesis of DUSP22 phosphatase activity, JNK activation assay, apoptosis assay |
PloS one |
Medium |
27711255
|
| 2018 |
SENP3-mediated deSUMOylation of MKK7 promotes MKK7 binding to JNK and enhances JNK phosphorylation; MKK7 undergoes SUMO2/3 modification and SENP3 is a redox-sensitive (ROS-dependent) protease that accumulates after LPS, linking redox signaling to MKK7 activity in macrophages |
Conditional Senp3 KO mice, Co-immunoprecipitation, SUMOylation assay, JNK phosphorylation assay, LPS in vivo model |
The Journal of biological chemistry |
High |
29352108
|
| 2018 |
Covalent virtual screening identified selective MKK7 covalent inhibitors; the crystal structure of a lead compound bound to MKK7 confirmed the predicted covalent binding mode; compounds selectively inhibit JNK phosphorylation in cells and block LPS-induced B cell activation |
Covalent virtual screening, X-ray crystallography of MKK7-inhibitor complex, kinase panel selectivity, KO cell validation, B cell activation assay |
Cell chemical biology |
High |
30449673
|
| 2014 |
5Z-7-Oxozeaenol covalently binds to MKK7 at Cys218 (located at the end of the hinge region), not at the gatekeeper-2 cysteine; crystal structure of MAP2K7/5Z7O complex confirms this unprecedented binding mode |
X-ray crystallography of MAP2K7/5Z7O complex |
Bioorganic & medicinal chemistry letters |
High |
25529738
|
| 2020 |
Crystal structures of MKK7 catalytic domain reveal an N-terminal regulatory helix mediating kinase activation (allosteric mechanism conserved in all MAP2Ks); structures show typical active kinase features when this helix is present; an unprecedented allosteric pocket in the N-terminal lobe binds ibrutinib; type II irreversible inhibitors bind in a mode not previously reported for MKK7 |
Multiple X-ray crystal structures of MKK7, small-molecule screening, functional kinase assays |
Cell chemical biology |
High |
32783966
|
| 2015 |
Neddylation of MKK7 (mediated by RanBP2 acting as SUMO/neddylation E3 ligase for MKK7) limits its basal kinase activity; RanBP2 knockdown augments basal JNK phosphorylation; in vitro neddylation of purified MKK7 by RanBP2ΔFG reduces its basal kinase activity |
In vitro neddylation assay, Co-immunoprecipitation, siRNA knockdown, JNK phosphorylation assay |
Oncogene |
High |
26364603
|
| 2020 |
MBNL1 suppresses a MAP2K7Δexon2 splice variant; this variant drives JNK activation and tumor dedifferentiation/stem-like properties in MBNL1-low cancers; JNK inhibition reverses MAP2K7Δexon2-driven dedifferentiation |
MBNL1 knockdown/overexpression, alternative splicing analysis, JNK activation assays, tumor xenograft and in vitro stemness assays |
Proceedings of the National Academy of Sciences |
High |
32601196
|
| 2022 |
EEF1AKMT3 catalyzes monomethylation of MKK7 at Lys296, which decreases MKK7 phosphorylation, ubiquitination, and degradation of TP53; EEF1AKMT3 knockdown induces gastric tumor invasiveness by activating MAP2K7/MKK7 and downstream JNK signaling |
Mass spectrometry analysis of MKK7 methylation site, phospho-antibody array, gain/loss-of-function studies, RNA-seq |
Cancer letters |
High |
35753528
|