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Mashukova A, Forteza R, Shah VN, Salas PJ. The cell polarity kinase Par1b/MARK2 activation selects specific NF-kB transcripts via phosphorylation of core mediator Med17/TRAP80. Mol Biol Cell 2021; 32:690-702. [PMID: 33596087 PMCID: PMC8108508 DOI: 10.1091/mbc.e20-10-0646] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Par1b/MARK2 is a Ser/Thr kinase with pleiotropic effects that participates in the generation of apico-basal polarity in Caenorhabditis elegans. It is phosphorylated by atypical PKC(ι/λ) in Thr595 and inhibited. Because previous work showed a decrease in atypical protein kinase C (aPKC) activity under proinflammatory conditions, we analyzed the hypothesis that the resulting decrease in Thr595-MARK2 with increased kinase activity may also participate in innate immunity. We confirmed that pT595-MARK2 was decreased under inflammatory stimulation. The increase in MARK2 activity was verified by Par3 delocalization and rescue with a specific inhibitor. MARK2 overexpression significantly enhanced the transcriptional activity of NF-kB for a subset of transcripts. It also resulted in phosphorylation of a single band (∼Mr 80,000) coimmunoprecipitating with RelA, identified as Med17. In vitro phosphorylation showed direct phosphorylation of Med17 in Ser152 by recombinant MARK2. Expression of S152D-Med17 mimicked the effect of MARK2 activation on downstream transcriptional regulation, which was antagonized by S152A-Med17. The decrease in pThr595 phosphorylation was validated in aPKC-deficient mouse jejunal mucosae. The transcriptional effects were confirmed in transcriptome analysis and transcript enrichment determinations in cells expressing S152D-Med17. We conclude that theMARK2-Med17 axis represents a novel form of cross-talk between polarity signaling and transcriptional regulation including, but not restricted to, innate immunity responses.
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Affiliation(s)
- Anastasia Mashukova
- Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL 33136.,Department of Medical Education, Dr. Kiran C. Patel College of Allopathic Medicine, Nova Southeastern University, Fort Lauderdale, FL 33314
| | - Radia Forteza
- Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL 33136
| | - Viraj N Shah
- Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL 33136
| | - Pedro J Salas
- Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL 33136
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SIMPL enhancement of tumor necrosis factor-α dependent p65-MED1 complex formation is required for mammalian hematopoietic stem and progenitor cell function. PLoS One 2013; 8:e61123. [PMID: 23630580 PMCID: PMC3632537 DOI: 10.1371/journal.pone.0061123] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Accepted: 03/05/2013] [Indexed: 11/19/2022] Open
Abstract
Significant insight into the signaling pathways leading to activation of the Rel transcription factor family, collectively termed NF-κB, has been gained. Less well understood is how subsets of NF-κB-dependent genes are regulated in a signal specific manner. The SIMPL protein (signaling molecule that interacts with mouse pelle-like kinase) is required for full Tumor Necrosis Factor-α (TNFα) induced NF-κB activity. We show that SIMPL is required for steady-state hematopoiesis and the expression of a subset of TNFα induced genes whose products regulate hematopoietic cell activity. To gain insight into the mechanism through which SIMPL modulates gene expression we focused on the Tnf gene, an immune response regulator required for steady-state hematopoiesis. In response to TNFα SIMPL localizes to the Tnf gene promoter where it modulates the initiation of Tnf gene transcription. SIMPL binding partners identified by mass spectrometry include proteins involved in transcription and the interaction between SIMPL and MED1 was characterized in more detail. In response to TNFα, SIMPL is found in p65-MED1 complexes where SIMPL enhances p65/MED1/SIMPL complex formation. Together our results indicate that SIMPL functions as a TNFα-dependent p65 co-activator by facilitating the recruitment of MED1 to p65 containing transcriptional complexes to control the expression of a subset of TNFα-induced genes.
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Camicia R, Bachmann SB, Winkler HC, Beer M, Tinguely M, Haralambieva E, Hassa PO. BAL1/ARTD9 represses the anti-proliferative and pro-apoptotic IFNγ-STAT1-IRF1-53 axes in diffuse large B-cell lymphoma. J Cell Sci 2013; 126:1969-80. [DOI: 10.1242/jcs.118174] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The B-aggressive lymphoma-1 protein and ADP-ribosyltransferase BAL1/ARTD9 has been recently identified as a novel risk-related gene product in aggressive diffuse large B-cell lymphoma (DLBCL). BAL1 is constitutively expressed in a subset of high-risk DLBCL with an active host inflammatory response and suggested to be associated with interferon related gene expression. Here we identify BAL1 as a novel oncogenic survival factor in DLBCL and show that constitutive overexpression of BAL1 in DLBCL tightly associates with intrinsic interferon-gamma (IFNγ) signaling and constitutive activity of signal transducer and activator of transcription (STAT)-1. Remarkably, BAL1 stimulates the phosphorylation of both STAT1 isoforms STAT1α and STAT1β, on Y701 and thereby promoting the nuclear accumulation of the antagonistically acting and transcriptionally repressive isoform STAT1β. Moreover, BAL1 physically interacts with both isoforms of STAT1, STAT1α and STAT1β through its macro domains in an ADP-ribosylation dependent manner. BAL1 directly inhibits together with STAT1β the expression of tumor suppressor and interferon response factor (IRF)-1. Conversely, BAL1 enhances the expression of the proto-oncogenes IRF2 and B-cell CLL/lymphoma (BCL)-6 in DLBCL. Our results show the first time that BAL1 represses the anti-proliferative and pro-apoptotic IFNγ-STAT1-IRF1-53 axes and mediates proliferation, survival and chemo-resistance in DLBCL. As a consequence constitutive IFNγ-STAT1 signaling does not lead to apoptosis but rather to chemo-resistance in DLBCL overexpressing BAL1. Our results suggest that BAL1 may induce an oncogenic switch in STAT1 from a tumor suppressor to an oncogene in high-risk DLBCL.
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Sabatel H, Di Valentin E, Gloire G, Dequiedt F, Piette J, Habraken Y. Phosphorylation of p65(RelA) on Ser(547) by ATM represses NF-κB-dependent transcription of specific genes after genotoxic stress. PLoS One 2012; 7:e38246. [PMID: 22715377 PMCID: PMC3371017 DOI: 10.1371/journal.pone.0038246] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2012] [Accepted: 05/02/2012] [Indexed: 12/03/2022] Open
Abstract
The NF-κB pathway is involved in immune and inflammation responses, proliferation, differentiation and cell death or survival. It is activated by many external stimuli including genotoxic stress. DNA double-strand breaks activate NF-κB in an ATM-dependent manner. In this manuscript, a direct interaction between p65(RelA) and the N-terminal extremity of ATM is reported. We also report that only one of the five potential ATM-(S/T)Q target sites present in p65, namely Ser547, is specifically phosphorylated by ATM in vitro. A comparative transcriptomic analysis performed in HEK-293 cells expressing either wild-type HA-p65 or a non-phosphorylatable mutant HA-p65S547A identified several differentially transcribed genes after an etoposide treatment (e.g. IL8, A20, SELE). The transcription of these genes is increased in cells expressing the mutant. Substitution of Ser547 to alanine does not affect p65 binding abilities on the κB site of the IL8 promoter but reduces p65 interaction with HDAC1. Cells expressing p65S547A have a higher level of histone H3 acetylated on Lys9 at the IL8 promoter, which is in agreement with the higher gene induction observed. These results indicate that ATM regulates a sub-set of NF-κB dependent genes after a genotoxic stress by direct phosphorylation of p65.
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Affiliation(s)
- Hélène Sabatel
- Laboratory of Virology and Immunology, GIGA-R, Signal Transduction Unit, University of Liège, Liège, Belgium
| | - Emmanuel Di Valentin
- Laboratory of Virology and Immunology, GIGA-R, Signal Transduction Unit, University of Liège, Liège, Belgium
| | - Geoffrey Gloire
- Laboratory of Virology and Immunology, GIGA-R, Signal Transduction Unit, University of Liège, Liège, Belgium
- Interface Entreprises-Université Liège Science Park, Angleur, Belgium
| | - Franck Dequiedt
- Laboratory of Signalisation and Protein Interaction, GIGA-R, Signal Transduction Unit, University of Liège, Liège, Belgium
| | - Jacques Piette
- Laboratory of Virology and Immunology, GIGA-R, Signal Transduction Unit, University of Liège, Liège, Belgium
| | - Yvette Habraken
- Laboratory of Virology and Immunology, GIGA-R, Signal Transduction Unit, University of Liège, Liège, Belgium
- * E-mail:
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Abstract
The RelA (p65) NF-kappaB (nuclear factor kappaB) subunit contains an extremely active C-terminal transcriptional activation domain, required for its cellular function. In the present article, we review our knowledge of this domain, its modifications and its known interacting proteins. Moreover, we discuss how analysis of its evolutionary conservation reveals distinct subdomains and conserved residues that might give insights into its regulation and function.
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Grill B, Bienvenut WV, Brown HM, Ackley BD, Quadroni M, Jin Y. C. elegans RPM-1 regulates axon termination and synaptogenesis through the Rab GEF GLO-4 and the Rab GTPase GLO-1. Neuron 2007; 55:587-601. [PMID: 17698012 DOI: 10.1016/j.neuron.2007.07.009] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2006] [Revised: 05/29/2007] [Accepted: 07/06/2007] [Indexed: 10/22/2022]
Abstract
C. elegans RPM-1 (for Regulator of Presynaptic Morphology) is a member of a conserved protein family that includes Drosophila Highwire and mammalian Pam and Phr1. These are large proteins recently shown to regulate synaptogenesis through E3 ubiquitin ligase activities. Here, we report the identification of an RCC1-like guanine nucleotide exchange factor, GLO-4, from mass spectrometry analysis of RPM-1-associated proteins. GLO-4 colocalizes with RPM-1 at presynaptic terminals. Loss of function in glo-4 or in its target Rab GTPase, glo-1, causes neuronal defects resembling those in rpm-1 mutants. We show that the glo pathway functions downstream of rpm-1 and acts in parallel to fsn-1, a partner of RPM-1 E3 ligase function. We find that late endosomes are specifically disorganized at the presynaptic terminals of glo-4 mutants. Our data suggest that RPM-1 positively regulates a Rab GTPase pathway to promote vesicular trafficking via late endosomes.
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Affiliation(s)
- Brock Grill
- Department of Molecular, Cell and Developmental Biology, Sinsheimer Laboratories, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
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Owen HR, Elser M, Cheung E, Gersbach M, Kraus WL, Hottiger MO. MYBBP1a is a Novel Repressor of NF-κB. J Mol Biol 2007; 366:725-36. [PMID: 17196614 DOI: 10.1016/j.jmb.2006.11.099] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2006] [Revised: 11/17/2006] [Accepted: 11/21/2006] [Indexed: 01/22/2023]
Abstract
NF-kappaB is an inducible transcription factor activated in many different cell types by inflammatory and stress signals. The transcription of a wide variety of NF-kappaB genes is regulated by the coordinated action of transcription co-activators and co-repressors. Previously we identified Myb binding protein 1a (MYBBP1a) as an interaction partner of the transcription activation domain of RelA/p65. MYBBP1a has been shown by others to regulate various transcription factors, through largely unknown mechanisms. Here we present evidence that MYBBP1a is a novel co-repressor of NF-kappaB. MYBBP1a interacted directly with RelA/p65 and expression of MYBBP1a in cells repressed NF-kappaB dependent reporter expression but did affect neither RelA/p65 nuclear translocation nor its DNA binding activity. In vitro, MYBBP1a inhibited transcription from chromatinized templates at a step before pre-initiation complex formation. MYBBP1a was found to compete with the histone acetyl transferase co-activator, p300, for interaction with the transcription activation domain of RelA/p65. Expression levels of MYBBP1a are dependent on the cell type, and are particularly high in Jurkat T cells. These results indicate that MYBBP1a is a novel NF-kappaB co-repressor of transcription that competes with p300 and may function to regulate cell type specific genes.
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Affiliation(s)
- Heather R Owen
- Institute of Veterinary Biochemistry and Molecular Biology, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
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Contzler R, Regamey A, Favre B, Roger T, Hohl D, Huber M. Histone acetyltransferase HBO1 inhibits NF-kappaB activity by coactivator sequestration. Biochem Biophys Res Commun 2006; 350:208-13. [PMID: 16997280 DOI: 10.1016/j.bbrc.2006.09.030] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2006] [Accepted: 09/08/2006] [Indexed: 11/16/2022]
Abstract
The MYST acetyltransferase HBO1 is implicated in the regulation of DNA replication and activities of transcription factors such as the androgen receptor. Since the androgen receptor and NF-kappaB transcription factors crossmodulate their transcriptional activity, we investigated whether HBO1 regulates NF-kappaB signaling. Here, we report that in 293T cells HBO1 reduced dose-dependently NF-kappaB activity stimulated by TNFalpha, or by overexpressing p65/RelA, RelB, or cRel. Mutational analysis showed that the N-terminal serine-rich region of HBO1 but not the acetyltransferase function was required for inhibition. Electrophoretic mobility-shift assays demonstrated that HBO1 was neither perturbing the formation of p65/RelA DNA complexes nor binding itself to the kappaB consensus sequence or to p65/RelA, suggesting that HBO1 reduced NF-kappaB activity by squelching a cofactor. These data establish a novel function for HBO1 showing that it reduced NF-kappaB activity by sequestrating an essential coactivator from the NF-kappaB transcriptional complex.
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Affiliation(s)
- Romuald Contzler
- Laboratory of Cutaneous Biology, CHUV, Service of Dermatology, Hospital Beaumont 04-421, Lausanne 1011, Switzerland
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