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Chirieleison SM, Marsh RA, Kumar P, Rathkey JK, Dubyak GR, Abbott DW. Nucleotide-binding oligomerization domain (NOD) signaling defects and cell death susceptibility cannot be uncoupled in X-linked inhibitor of apoptosis (XIAP)-driven inflammatory disease. J Biol Chem 2017; 292:9666-9679. [PMID: 28404814 DOI: 10.1074/jbc.m117.781500] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 04/03/2017] [Indexed: 12/22/2022] Open
Abstract
The X-linked inhibitor of apoptosis (XIAP) protein has been identified as a key genetic driver of two distinct inflammatory disorders, X-linked lymphoproliferative syndrome 2 (XLP-2) and very-early-onset inflammatory bowel disease (VEO-IBD). Molecularly, the role of XIAP mutations in the pathogenesis of these disorders is unclear. Recent work has consistently shown XIAP to be critical for signaling downstream of the Crohn's disease susceptibility protein nucleotide-binding oligomerization domain-containing 2 (NOD2); however, the reported effects of XLP-2 and VEO-IBD XIAP mutations on cell death have been inconsistent. In this manuscript, we describe a CRISPR-mediated genetic system for cells of the myeloid lineage in which XIAP alleles can be replaced with disease-associated XIAP variants expressed at endogenous levels to simultaneously study inflammation-related cell death and NOD2 signaling. We show that, consistent with previous studies, NOD2 signaling is critically dependent on the BIR2 domain of XIAP. We further used this system to reconcile the aforementioned inconsistent XIAP cell death data to show that XLP-2 and VEO-IBD XIAP mutations that exhibit a loss-of-function NOD2 phenotype also lower the threshold for inflammatory cell death. Last, we identified and studied three novel patient XIAP mutations and used this system to characterize NOD2 and cell death phenotypes driven by XIAP. The results of this work support the role of XIAP in mediating NOD2 signaling while reconciling the role of XLP-2 and VEO-IBD XIAP mutations in inflammatory cell death and provide a set of tools and framework to rapidly test newly discovered XIAP variants.
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Affiliation(s)
| | - Rebecca A Marsh
- the Division of Bone Marrow Transplantation and Immune Deficiency, Cincinnati Children's Hospital, Cincinnati, Ohio 45229
| | | | | | - George R Dubyak
- Physiology and Biophysics, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106 and
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Yin X, Jin N, Gu J, Shi J, Zhou J, Gong CX, Iqbal K, Grundke-Iqbal I, Liu F. Dual-specificity tyrosine phosphorylation-regulated kinase 1A (Dyrk1A) modulates serine/arginine-rich protein 55 (SRp55)-promoted Tau exon 10 inclusion. J Biol Chem 2012; 287:30497-506. [PMID: 22767602 PMCID: PMC3436298 DOI: 10.1074/jbc.m112.355412] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 06/10/2012] [Indexed: 11/06/2022] Open
Abstract
Tau exon 10, which encodes the second microtubule-binding repeat, is regulated by alternative splicing. Its alternative splicing generates Tau isoforms with three- or four-microtubule-binding repeats, named 3R-tau and 4R-tau. Adult human brain expresses equal levels of 3R-tau and 4R-tau. Imbalance of 3R-tau and 4R-tau causes Tau aggregation and neurofibrillary degeneration. In the present study, we found that splicing factor SRp55 (serine/arginine-rich protein 55) promoted Tau exon 10 inclusion. Knockdown of SRp55 significantly promoted Tau exon 10 exclusion. The promotion of Tau exon 10 inclusion by SRp55 required the arginine/serine-rich region, which was responsible for the subnucleic speckle localization. Dyrk1A (dual specificity tyrosine-phosphorylated and regulated kinase 1A) interacted with SRp55 and mainly phosphorylated its proline-rich domain. Phosphorylation of SRp55 by Dyrk1A suppressed its ability to promote Tau exon 10 inclusion. Up-regulation of Dyrk1A as in Down syndrome could lead to neurofibrillary degeneration by shifting the alternative splicing of Tau exon 10 to an increase in the ratio of 3R-tau/4R-tau.
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Affiliation(s)
- Xiaomin Yin
- From the Jiangsu Key Laboratory of Neuroregeneration and
- the Department of Biochemistry and Molecular Biology, Medical School, Nantong University, Nantong, Jiangsu, 226001, China and
| | - Nana Jin
- From the Jiangsu Key Laboratory of Neuroregeneration and
| | - Jianlan Gu
- From the Jiangsu Key Laboratory of Neuroregeneration and
- the Department of Biochemistry and Molecular Biology, Medical School, Nantong University, Nantong, Jiangsu, 226001, China and
| | - Jianhua Shi
- From the Jiangsu Key Laboratory of Neuroregeneration and
- the Department of Biochemistry and Molecular Biology, Medical School, Nantong University, Nantong, Jiangsu, 226001, China and
| | - Jianhua Zhou
- From the Jiangsu Key Laboratory of Neuroregeneration and
| | - Cheng-Xin Gong
- From the Jiangsu Key Laboratory of Neuroregeneration and
- the Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314
| | - Khalid Iqbal
- the Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314
| | - Inge Grundke-Iqbal
- the Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314
| | - Fei Liu
- From the Jiangsu Key Laboratory of Neuroregeneration and
- the Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314
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Arora G, Sajid A, Arulanandh MD, Singhal A, Mattoo AR, Pomerantsev AP, Leppla SH, Maiti S, Singh Y. Unveiling the novel dual specificity protein kinases in Bacillus anthracis: identification of the first prokaryotic dual specificity tyrosine phosphorylation-regulated kinase (DYRK)-like kinase. J Biol Chem 2012; 287:26749-63. [PMID: 22711536 PMCID: PMC3411013 DOI: 10.1074/jbc.m112.351304] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 06/14/2012] [Indexed: 12/23/2022] Open
Abstract
Dual specificity protein kinases (DSPKs) are unique enzymes that can execute multiple functions in the cell, which are otherwise performed exclusively by serine/threonine and tyrosine protein kinases. In this study, we have characterized the protein kinases Bas2152 (PrkD) and Bas2037 (PrkG) from Bacillus anthracis. Transcriptional analyses of these kinases showed that they are expressed in all phases of growth. In a serendipitous discovery, both kinases were found to be DSPKs. PrkD was found to be similar to the eukaryotic dual specificity Tyr phosphorylation-regulated kinase class of dual specificity kinases, which autophosphorylates on Ser, Thr, and Tyr residues and phosphorylates Ser and Thr residues on substrates. PrkG was found to be a bona fide dual specificity protein kinase that mediates autophosphorylation and substrate phosphorylation on Ser, Thr, and Tyr residues. The sites of phosphorylation in both of the kinases were identified through mass spectrometry. Phosphorylation on Tyr residues regulates the kinase activity of PrkD and PrkG. PrpC, the only known Ser/Thr protein phosphatase, was also found to possess dual specificity. Genistein, a known Tyr kinase inhibitor, was found to inhibit the activities of PrkD and PrkG and affect the growth of B. anthracis cells, indicating a possible role of these kinases in cell growth and development. In addition, the glycolytic enzyme pyruvate kinase was found to be phosphorylated by PrkD on Ser and Thr residues but not by PrkG. Thus, this study provides the first evidence of DSPKs in B. anthracis that belong to different classes and have different modes of regulation.
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Affiliation(s)
- Gunjan Arora
- From the Council of Scientific and Industrial Research-Institute of Genomics and Integrative Biology, Mall Road, Delhi 110007, India and
| | - Andaleeb Sajid
- From the Council of Scientific and Industrial Research-Institute of Genomics and Integrative Biology, Mall Road, Delhi 110007, India and
| | - Mary Diana Arulanandh
- From the Council of Scientific and Industrial Research-Institute of Genomics and Integrative Biology, Mall Road, Delhi 110007, India and
| | - Anshika Singhal
- From the Council of Scientific and Industrial Research-Institute of Genomics and Integrative Biology, Mall Road, Delhi 110007, India and
| | - Abid R. Mattoo
- From the Council of Scientific and Industrial Research-Institute of Genomics and Integrative Biology, Mall Road, Delhi 110007, India and
| | - Andrei P. Pomerantsev
- the Laboratory of Parasitic Diseases, NIAID, National Institutes of Health, Bethesda, Maryland 20892-3202
| | - Stephen H. Leppla
- the Laboratory of Parasitic Diseases, NIAID, National Institutes of Health, Bethesda, Maryland 20892-3202
| | - Souvik Maiti
- From the Council of Scientific and Industrial Research-Institute of Genomics and Integrative Biology, Mall Road, Delhi 110007, India and
| | - Yogendra Singh
- From the Council of Scientific and Industrial Research-Institute of Genomics and Integrative Biology, Mall Road, Delhi 110007, India and
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Jung MS, Park JH, Ryu YS, Choi SH, Yoon SH, Kwen MY, Oh JY, Song WJ, Chung SH. Regulation of RCAN1 protein activity by Dyrk1A protein-mediated phosphorylation. J Biol Chem 2011; 286:40401-12. [PMID: 21965663 PMCID: PMC3220559 DOI: 10.1074/jbc.m111.253971] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Revised: 09/21/2011] [Indexed: 01/22/2023] Open
Abstract
Two genes on chromosome 21, namely dual specificity tyrosine phosphorylation-regulated kinase 1A (Dyrk1A) and regulator of calcineurin 1 (RCAN1), have been implicated in some of the phenotypic characteristics of Down syndrome, including the early onset of Alzheimer disease. Although a link between Dyrk1A and RCAN1 and the nuclear factor of activated T cells (NFAT) pathway has been reported, it remains unclear whether Dyrk1A directly interacts with RCAN1. In the present study, Dyrk1A is shown to directly interact with and phosphorylate RCAN1 at Ser(112) and Thr(192) residues. Dyrk1A-mediated phosphorylation of RCAN1 at Ser(112) primes the protein for the GSK3β-mediated phosphorylation of Ser(108). Phosphorylation of RCAN1 at Thr(192) by Dyrk1A enhances the ability of RCAN1 to inhibit the phosphatase activity of calcineurin (Caln), leading to reduced NFAT transcriptional activity and enhanced Tau phosphorylation. These effects are mediated by the enhanced binding of RCAN1 to Caln and its extended half-life caused by Dyrk1A-mediated phosphorylation. Furthermore, an increased expression of phospho-Thr(192)-RCAN1 was observed in the brains of transgenic mice overexpressing the Dyrk1A protein. These results suggest a direct link between Dyrk1A and RCAN1 in the Caln-NFAT signaling and Tau hyperphosphorylation pathways, supporting the notion that the synergistic interaction between the chromosome 21 genes RCAN1 and Dyrk1A is associated with a variety of pathological features associated with DS.
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Affiliation(s)
- Min-Su Jung
- From the Graduate Program in Neuroscience, Institute for Brain Science and Technology, FIRST Research Group, Inje University, 633-146 Gaegeum-2-Dong, Busanjin-Gu, Busan 614-735, South Korea
| | - Jung-Hwa Park
- From the Graduate Program in Neuroscience, Institute for Brain Science and Technology, FIRST Research Group, Inje University, 633-146 Gaegeum-2-Dong, Busanjin-Gu, Busan 614-735, South Korea
| | - Young Shin Ryu
- From the Graduate Program in Neuroscience, Institute for Brain Science and Technology, FIRST Research Group, Inje University, 633-146 Gaegeum-2-Dong, Busanjin-Gu, Busan 614-735, South Korea
| | - Sun-Hee Choi
- From the Graduate Program in Neuroscience, Institute for Brain Science and Technology, FIRST Research Group, Inje University, 633-146 Gaegeum-2-Dong, Busanjin-Gu, Busan 614-735, South Korea
| | - Song-Hee Yoon
- From the Graduate Program in Neuroscience, Institute for Brain Science and Technology, FIRST Research Group, Inje University, 633-146 Gaegeum-2-Dong, Busanjin-Gu, Busan 614-735, South Korea
| | - Mi-Yang Kwen
- From the Graduate Program in Neuroscience, Institute for Brain Science and Technology, FIRST Research Group, Inje University, 633-146 Gaegeum-2-Dong, Busanjin-Gu, Busan 614-735, South Korea
| | - Ji Youn Oh
- From the Graduate Program in Neuroscience, Institute for Brain Science and Technology, FIRST Research Group, Inje University, 633-146 Gaegeum-2-Dong, Busanjin-Gu, Busan 614-735, South Korea
| | - Woo-Joo Song
- From the Graduate Program in Neuroscience, Institute for Brain Science and Technology, FIRST Research Group, Inje University, 633-146 Gaegeum-2-Dong, Busanjin-Gu, Busan 614-735, South Korea
| | - Sul-Hee Chung
- From the Graduate Program in Neuroscience, Institute for Brain Science and Technology, FIRST Research Group, Inje University, 633-146 Gaegeum-2-Dong, Busanjin-Gu, Busan 614-735, South Korea
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Lu M, Zheng L, Han B, Wang L, Wang P, Liu H, Sun X. REST regulates DYRK1A transcription in a negative feedback loop. J Biol Chem 2011; 286:10755-63. [PMID: 21252229 PMCID: PMC3060526 DOI: 10.1074/jbc.m110.174540] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 01/12/2011] [Indexed: 11/06/2022] Open
Abstract
DYRK1A (dual specificity tyrosine phosphorylation-regulated kinase 1A) has been shown to be involved in learning and memory impairments in Alzheimer disease and Down syndrome. As a homolog of Drosophila minibrain gene, DYRK1A also plays important roles in neurodevelopment; however, the function and regulatory mechanism of DYRK1A in neurodevelopment remain elusive. REST (RE1 silencing transcription factor) plays vital roles in neuronal differentiation. Here, we found that REST can activate DYRK1A transcription via a neuron-restrictive silencer element at bp -833 to -815 of human DYRK1A promoter. The coordinated expression of DYRK1A and REST in mouse brain further supports the cross-interaction of DYRK1A and REST during neurodevelopment. Moreover, we showed that DYRK1A dosage imbalance reduced REST protein stability and transcriptional activity through facilitating ubiquitination and subsequent degradation of REST protein. Therefore, the regulation of DYRK1A by REST in a negative feedback loop suggests that DYRK1A and REST are closely related in neurodevelopment.
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Affiliation(s)
- Mei Lu
- From the Otolaryngology Lab and
- the Department of Neurology, Qilu Hospital of Shandong University, Jinan 250012, China
| | | | - Bo Han
- From the Otolaryngology Lab and
- the Qingdao Institute of Bioenegry and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China, and
| | | | | | - Heng Liu
- From the Otolaryngology Lab and
- the Institute of Traditional Chinese Medicine Theory, Shandong University of Traditional Chinese Medicine, Jinan 250014, China
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Papadopoulos C, Arato K, Lilienthal E, Zerweck J, Schutkowski M, Chatain N, Müller-Newen G, Becker W, de la Luna S. Splice variants of the dual specificity tyrosine phosphorylation-regulated kinase 4 (DYRK4) differ in their subcellular localization and catalytic activity. J Biol Chem 2011; 286:5494-505. [PMID: 21127067 PMCID: PMC3037663 DOI: 10.1074/jbc.m110.157909] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Revised: 12/01/2010] [Indexed: 11/06/2022] Open
Abstract
Dual specificity tyrosine phosphorylation-regulated kinases, DYRKs, are a family of conserved protein kinases that play key roles in the regulation of cell differentiation, proliferation, and survival. Of the five mammalian DYRKs, DYRK4 is the least studied family member. Here, we show that several splice variants of DYRK4 are expressed in tissue-specific patterns and that these variants have distinct functional capacities. One of these variants contains a nuclear localization signal in its extended N terminus that mediates its interaction with importin α3 and α5 and that is capable of targeting a heterologous protein to the nucleus. Consequently, the nucleocytoplasmic mobility of this variant differs from that of a shorter isoform in live cell imaging experiments. Other splicing events affect the catalytic domain, including a three-amino acid deletion within subdomain XI that markedly reduces the enzymatic activity of DYRK4. We also show that autophosphorylation of a tyrosine residue within the activation loop is necessary for full DYRK4 kinase activity, a defining feature of the DYRK family. Finally, by comparing the phosphorylation of an array of 720 peptides, we show that DYRK1A, DYRK2, and DYRK4 differ in their target recognition sequence and that preference for an arginine residue at position P -3 is a feature of DYRK1A but not of DYRK2 and DYRK4. Therefore, we highlight the use of subcellular localization as an important regulatory mechanism for DYRK proteins, and we propose that substrate specificity could be a source of functional diversity among DYRKs.
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Affiliation(s)
- Chrisovalantis Papadopoulos
- From the Genes and Disease Program, Centre for Genomic Regulation, University Pompeu Fabra, Dr. Aiguader 88, 08003 Barcelona, Spain
- the Institute of Pharmacology and Toxicology, Rheinisch-Westfaelische Technische Hochschule Aachen University, Wendlingweg 2, 52074 Aachen, Germany
| | - Krisztina Arato
- From the Genes and Disease Program, Centre for Genomic Regulation, University Pompeu Fabra, Dr. Aiguader 88, 08003 Barcelona, Spain
- the Centro de Investigación Biomédica en Red de Enfermedades Raras, 08003 Barcelona, Spain
| | - Eva Lilienthal
- the Institute of Pharmacology and Toxicology, Rheinisch-Westfaelische Technische Hochschule Aachen University, Wendlingweg 2, 52074 Aachen, Germany
| | - Johannes Zerweck
- JPT Peptide Technologies GmbH, Volmerstrasse 5, 12489 Berlin, Germany
| | - Mike Schutkowski
- JPT Peptide Technologies GmbH, Volmerstrasse 5, 12489 Berlin, Germany
- the Institute of Biochemistry and Biotechnology, University of Halle-Wittenberg, Kurt-Mothes Strasse 3, 06099 Halle (Saale), Germany, and
| | - Nicolas Chatain
- the Department of Biochemistry, Rheinisch-Westfaelische Technische Hochschule Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany
| | - Gerhard Müller-Newen
- the Department of Biochemistry, Rheinisch-Westfaelische Technische Hochschule Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany
| | - Walter Becker
- the Institute of Pharmacology and Toxicology, Rheinisch-Westfaelische Technische Hochschule Aachen University, Wendlingweg 2, 52074 Aachen, Germany
| | - Susana de la Luna
- From the Genes and Disease Program, Centre for Genomic Regulation, University Pompeu Fabra, Dr. Aiguader 88, 08003 Barcelona, Spain
- the Centro de Investigación Biomédica en Red de Enfermedades Raras, 08003 Barcelona, Spain
- the Institució Catalana de Recerca i Estudis Avançats, 08003 Barcelona, Spain
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Li D, Jackson RA, Yusoff P, Guy GR. Direct association of Sprouty-related protein with an EVH1 domain (SPRED) 1 or SPRED2 with DYRK1A modifies substrate/kinase interactions. J Biol Chem 2010; 285:35374-85. [PMID: 20736167 PMCID: PMC2975161 DOI: 10.1074/jbc.m110.148445] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Revised: 08/23/2010] [Indexed: 12/30/2022] Open
Abstract
The mammalian SPRED (Sprouty-related protein with an EVH1 domain) proteins include a family of three members, SPRED1-3. Currently, little is known about their biochemistry. The best described, SPRED1, has been shown to inhibit the Ras/ERK pathway downstream of Ras. All three SPREDs have a cysteine-rich domain (CRD) that has high homology to the CRD of the Sprouty family of proteins, several of which are also Ras/ERK inhibitors. In the belief that binding partners would clarify SPRED function, we assayed for their associated proteins. Here, we describe the direct and endogenous interaction of SPRED1 and SPRED2 with the novel kinase, DYRK1A. DYRK1A has become the subject of recent research focus as it plays a central role in Caenorhabditis elegans oocyte maturation and egg activation, and there is strong evidence that it could be involved in Down syndrome in humans. Both SPRED1 and SPRED2 inhibit the ability of DYRK1A to phosphorylate its substrates, Tau and STAT3. This inhibition occurs via an interaction of the CRD of the SPREDs with the kinase domain of DYRK1A. DYRK1A substrates must bind to the kinase to enable phosphorylation, and SPRED proteins compete for the same binding site to modify this process. Our accumulated evidence indicates that the SPRED proteins are likely physiological modifiers of DYRK1A.
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Affiliation(s)
- Dan Li
- From the Institute of Molecular and Cell Biology, Signal Transduction Laboratory, 61 Biopolis Drive, Proteos 138673, Singapore
| | - Rebecca A. Jackson
- From the Institute of Molecular and Cell Biology, Signal Transduction Laboratory, 61 Biopolis Drive, Proteos 138673, Singapore
| | - Permeen Yusoff
- From the Institute of Molecular and Cell Biology, Signal Transduction Laboratory, 61 Biopolis Drive, Proteos 138673, Singapore
| | - Graeme R. Guy
- From the Institute of Molecular and Cell Biology, Signal Transduction Laboratory, 61 Biopolis Drive, Proteos 138673, Singapore
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Gurtner A, Starace G, Norelli G, Piaggio G, Sacchi A, Bossi G. Mutant p53-induced up-regulation of mitogen-activated protein kinase kinase 3 contributes to gain of function. J Biol Chem 2010; 285:14160-9. [PMID: 20223820 PMCID: PMC2863202 DOI: 10.1074/jbc.m109.094813] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Revised: 03/09/2010] [Indexed: 01/02/2023] Open
Abstract
Mitogen-activated protein kinase kinase 3 (MAP2K3) is a member of the dual specificity kinase group. Growing evidence links MAP2K3 to invasion and tumor progression. Here, we identify MAP2K3 as a transcriptional target of endogenous gain-of-function p53 mutants R273H, R175H, and R280K. We show that MAP2K3 modulation occurred at the mRNA and protein levels and that endogenous mutant p53 proteins are capable of binding to and activate the MAP2K3 promoter. In addition, we found that the studied p53 mutants regulate MAP2K3 gene expression through the involvement of the transcriptional cofactors NF-Y and NF-kappaB. Finally, functional studies showed that endogenous MAP2K3 knockdown inhibits proliferation and survival of human tumor cells, whereas the ectopic expression of MAP2K3 can rescue the proliferative defect induced by mutant p53 knockdown. Taken together, our findings define a novel player through which mutant p53 exerts its gain-of-function activity in cancer cells.
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Affiliation(s)
- Aymone Gurtner
- From the Molecular Oncogenesis Laboratory, Department of Experimental Oncology, Regina Elena Cancer Institute, Via delle Messi D'Oro 156, 00158 Rome, Italy and
| | - Giuseppe Starace
- the National Council of Research, Istituto di Neurobiologia e Medicina Molecolare, 00133 Rome, Italy
| | - Giuseppe Norelli
- From the Molecular Oncogenesis Laboratory, Department of Experimental Oncology, Regina Elena Cancer Institute, Via delle Messi D'Oro 156, 00158 Rome, Italy and
| | - Giulia Piaggio
- From the Molecular Oncogenesis Laboratory, Department of Experimental Oncology, Regina Elena Cancer Institute, Via delle Messi D'Oro 156, 00158 Rome, Italy and
| | - Ada Sacchi
- From the Molecular Oncogenesis Laboratory, Department of Experimental Oncology, Regina Elena Cancer Institute, Via delle Messi D'Oro 156, 00158 Rome, Italy and
| | - Gianluca Bossi
- From the Molecular Oncogenesis Laboratory, Department of Experimental Oncology, Regina Elena Cancer Institute, Via delle Messi D'Oro 156, 00158 Rome, Italy and
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