1
|
Ong KOK, Mok MMH, Niibori-Nambu A, Du L, Yanagida M, Wang CQ, Bahirvani AG, Chin DWL, Koh CP, Ng KP, Yamashita N, Jacob B, Yokomizo T, Takizawa H, Matsumura T, Suda T, Lau JYA, Tan TZ, Mori S, Yang H, Iwasaki M, Minami T, Asou N, Sun QY, Ding LW, Koeffler HP, Tenen DG, Shimizu R, Yamamoto M, Ito Y, Kham SKY, Yeoh AEJ, Chng WJ, Osato M. Activation of NOTCH signaling impedes cell proliferation and survival in acute megakaryoblastic leukemia. Exp Hematol 2024; 137:104255. [PMID: 38876252 DOI: 10.1016/j.exphem.2024.104255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 06/04/2024] [Accepted: 06/05/2024] [Indexed: 06/16/2024]
Abstract
The genetic lesions that drive acute megakaryoblastic leukemia (AMKL) have not been fully elucidated. To search for genetic alterations in AMKL, we performed targeted deep sequencing in 34 AMKL patient samples and 8 AMKL cell lines and detected frequent genetic mutations in the NOTCH pathway in addition to previously reported alterations in GATA-1 and the JAK-STAT pathway. Pharmacological and genetic NOTCH activation, but not inhibition, significantly suppressed AMKL cell proliferation in both in vitro and in vivo assays employing a patient-derived xenograft model. These results suggest that NOTCH inactivation underlies AMKL leukemogenesis. and NOTCH activation holds the potential for therapeutic application in AMKL.
Collapse
Affiliation(s)
- Kelly Ooi Kee Ong
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Michelle Meng Huang Mok
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Akiko Niibori-Nambu
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Linsen Du
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Masatoshi Yanagida
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Chelsia Qiuxia Wang
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore; Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore; Bioprocessing Technology Institute, A*STAR, Singapore
| | | | - Desmond Wai Loon Chin
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Cai Ping Koh
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - King Pan Ng
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Namiko Yamashita
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Bindya Jacob
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore; Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Tomomasa Yokomizo
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore; International Research Center for Medical Sciences, Kumamoto University, Japan
| | - Hitoshi Takizawa
- International Research Center for Medical Sciences, Kumamoto University, Japan
| | - Takayoshi Matsumura
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Toshio Suda
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Jie-Ying Amelia Lau
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Tuan Zea Tan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Seiichi Mori
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Henry Yang
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Masayuki Iwasaki
- Institute of Laboratory Animals, Tokyo Women's Medical University, Japan
| | - Takashi Minami
- Center for Animal Resources and Development, Kumamoto University, Japan
| | - Norio Asou
- International Medical Center, Saitama Medical University, Japan
| | - Qiao-Yang Sun
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Ling-Wen Ding
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - H Phillip Koeffler
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Daniel G Tenen
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | | | | | - Yoshiaki Ito
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore; Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Shirley Kow Yin Kham
- Department of Paediatrics, National University of Singapore, Singapore, Singapore
| | - Allen Eng-Juh Yeoh
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore; Department of Paediatrics, National University of Singapore, Singapore, Singapore.
| | - Wee Joo Chng
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore; Department of Haematology-Oncology, National University Cancer Institute, Singapore, National University Health System, Singapore, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
| | - Motomi Osato
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore; Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore; International Research Center for Medical Sciences, Kumamoto University, Japan; Department of Paediatrics, National University of Singapore, Singapore, Singapore
| |
Collapse
|
2
|
Hunter GL, Giniger E. Phosphorylation and Proteolytic Cleavage of Notch in Canonical and Noncanonical Notch Signaling. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1227:51-68. [DOI: 10.1007/978-3-030-36422-9_4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
3
|
Epstein-Barr Virus Nuclear Antigen 3C Inhibits Expression of COBLL1 and the ADAM28-ADAMDEC1 Locus via Interaction with the Histone Lysine Demethylase KDM2B. J Virol 2018; 92:JVI.01362-18. [PMID: 30135119 PMCID: PMC6189496 DOI: 10.1128/jvi.01362-18] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 08/09/2018] [Indexed: 12/12/2022] Open
Abstract
EBV is a virus associated with human cancers and is well known for its ability to transform B lymphocytes into continuously proliferating lymphoblastoid cell lines. EBNA3C is considered an oncoprotein and has been shown to be essential for B cell transformation by EBV. EBNA3C is well characterized as a viral transcription factor, but very little is known about its mechanisms of action. In the present study, we demonstrate that removal of the activating histone mark H3K4me3 and deposition of the repressive mark H3K27me3 by EBNA3C on COBLL1 are achieved by at least two distinct mechanisms. Furthermore, we discovered that EBNA3C interacts with the lysine demethylase KDM2B and that this interaction is important for its transcriptional repressive function. The findings in this study provide new insights into the mechanism used by the oncoprotein EBNA3C to repress cellular target genes. Epstein-Barr virus nuclear antigen 3C (EBNA3C) is a well-defined repressor of host gene expression in B cells transformed by Epstein-Barr virus (EBV) that cooperates with various cellular factors. It is established that EBNA3C interacts with the cellular factor RBPJ (RBP-Jκ or CBF1) through two distinct motifs: the TFGC motif, also called the homology domain (HD) motif, and the VWTP motif. In this study, we investigated the role of each motif in EBNA3C transcriptional repression activity by using two novel recombinant viruses with single RBPJ interaction motifs mutated (EBNA3C HDmut and EBNA3C W227S). Infection of primary B cells with either of these recombinant EBVs led to the successful establishment of lymphoblastoid cell lines (LCLs). Gene expression analysis showed that full repression of EBNA3C target genes is not achieved by EBNA3C HDmut compared to that with EBNA3C W227S or the EBNA3C wild type (WT). Focusing on the well-characterized EBNA3C-repressed genes COBLL1, ADAM28, and ADAMDEC1, we investigated the mechanism of EBNA3C-mediated transcriptional repression. Chromatin immunoprecipitation (ChIP) analysis indicated that EBNA3C HDmut is still able to recruit Polycomb proteins BMI1 and SUZ12 to COBLL1 as efficiently as EBNA3C WT does, leading to the full deposition of the repressive histone mark H3K27me3. However, we found that the activation-associated chromatin mark H3K4me3 is highly enriched at EBNA3C target genes in LCLs expressing EBNA3C HDmut. We show here that EBNA3C interacts with the histone lysine demethylase KDM2B and that this interaction is important for H3K4me3 removal and for the EBNA3C-mediated repression of COBLL1 and the ADAM28-ADAMDEC1 locus. IMPORTANCE EBV is a virus associated with human cancers and is well known for its ability to transform B lymphocytes into continuously proliferating lymphoblastoid cell lines. EBNA3C is considered an oncoprotein and has been shown to be essential for B cell transformation by EBV. EBNA3C is well characterized as a viral transcription factor, but very little is known about its mechanisms of action. In the present study, we demonstrate that removal of the activating histone mark H3K4me3 and deposition of the repressive mark H3K27me3 by EBNA3C on COBLL1 are achieved by at least two distinct mechanisms. Furthermore, we discovered that EBNA3C interacts with the lysine demethylase KDM2B and that this interaction is important for its transcriptional repressive function. The findings in this study provide new insights into the mechanism used by the oncoprotein EBNA3C to repress cellular target genes.
Collapse
|
4
|
Kannan R, Cox E, Wang L, Kuzina I, Gu Q, Giniger E. Tyrosine phosphorylation and proteolytic cleavage of Notch are required for non-canonical Notch/Abl signaling in Drosophila axon guidance. Development 2018; 145:dev.151548. [PMID: 29343637 DOI: 10.1242/dev.151548] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 12/08/2017] [Indexed: 01/09/2023]
Abstract
Notch signaling is required for the development and physiology of nearly every tissue in metazoans. Much of Notch signaling is mediated by transcriptional regulation of downstream target genes, but Notch controls axon patterning in Drosophila by local modulation of Abl tyrosine kinase signaling, via direct interactions with the Abl co-factors Disabled and Trio. Here, we show that Notch-Abl axonal signaling requires both of the proteolytic cleavage events that initiate canonical Notch signaling. We further show that some Notch protein is tyrosine phosphorylated in Drosophila, that this form of the protein is selectively associated with Disabled and Trio, and that relevant tyrosines are essential for Notch-dependent axon patterning but not for canonical Notch-dependent regulation of cell fate. Based on these data, we propose a model for the molecular mechanism by which Notch controls Abl signaling in Drosophila axons.
Collapse
Affiliation(s)
- Ramakrishnan Kannan
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA
| | - Eric Cox
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA
| | - Lei Wang
- Fred Hutchinson Cancer Research Center, 1100 Fairview Ave, N., Seattle, WA 98109, USA
| | - Irina Kuzina
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA
| | - Qun Gu
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA
| | - Edward Giniger
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA .,Fred Hutchinson Cancer Research Center, 1100 Fairview Ave, N., Seattle, WA 98109, USA
| |
Collapse
|
5
|
Santio NM, Landor SKJ, Vahtera L, Ylä-Pelto J, Paloniemi E, Imanishi SY, Corthals G, Varjosalo M, Manoharan GB, Uri A, Lendahl U, Sahlgren C, Koskinen PJ. Phosphorylation of Notch1 by Pim kinases promotes oncogenic signaling in breast and prostate cancer cells. Oncotarget 2017; 7:43220-43238. [PMID: 27281612 PMCID: PMC5190019 DOI: 10.18632/oncotarget.9215] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 04/23/2016] [Indexed: 12/21/2022] Open
Abstract
Tumorigenesis is a multistep process involving co-operation between several deregulated oncoproteins. In this study, we unravel previously unrecognized interactions and crosstalk between Pim kinases and the Notch signaling pathway, with implications for both breast and prostate cancer. We identify Notch1 and Notch3, but not Notch2, as novel Pim substrates and demonstrate that for Notch1, the serine residue 2152 is phosphorylated by all three Pim family kinases. This target site is located in the second nuclear localization sequence (NLS) of the Notch1 intracellular domain (N1ICD), and is shown to be important for both nuclear localization and transcriptional activity of N1ICD. Phosphorylation-dependent stimulation of Notch1 signaling promotes migration of prostate cancer cells, balances glucose metabolism in breast cancer cells, and supports in vivo growth of both types of cancer cells on chick embryo chorioallantoic membranes. Furthermore, Pim-induced growth of orthotopic prostate xenografts in mice is associated with enhanced nuclear Notch1 activity. Finally, simultaneous inhibition of Pim and Notch abrogates the cellular responses more efficiently than individual treatments, opening up new vistas for combinatorial cancer therapy.
Collapse
Affiliation(s)
- Niina M Santio
- Section of Genetics and Physiology, Department of Biology, University of Turku, Turku, Finland.,Drug Research Doctoral Programme, University of Turku, Turku, Finland
| | - Sebastian K-J Landor
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku, Finland.,Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Laura Vahtera
- Section of Genetics and Physiology, Department of Biology, University of Turku, Turku, Finland
| | - Jani Ylä-Pelto
- Section of Genetics and Physiology, Department of Biology, University of Turku, Turku, Finland.,Drug Research Doctoral Programme, University of Turku, Turku, Finland
| | | | - Susumu Y Imanishi
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku, Finland.,Current address: Faculty of Pharmacy, Meijo University, Nagoya, Japan
| | - Garry Corthals
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku, Finland.,Current address: Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Amsterdam, The Netherlands
| | - Markku Varjosalo
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | | | - Asko Uri
- Institute of Chemistry, University of Tartu, Tartu, Estonia
| | - Urban Lendahl
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Cecilia Sahlgren
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku, Finland.,Department of Biomedical Engineering, Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Päivi J Koskinen
- Section of Genetics and Physiology, Department of Biology, University of Turku, Turku, Finland
| |
Collapse
|
6
|
Deatherage CL, Lu Z, Kroncke BM, Ma S, Smith JA, Voehler MW, McFeeters RL, Sanders CR. Structural and biochemical differences between the Notch and the amyloid precursor protein transmembrane domains. SCIENCE ADVANCES 2017; 3:e1602794. [PMID: 28439555 PMCID: PMC5389784 DOI: 10.1126/sciadv.1602794] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 02/13/2017] [Indexed: 05/11/2023]
Abstract
γ-Secretase cleavage of the Notch receptor transmembrane domain is a critical signaling event for various cellular processes. Efforts to develop inhibitors of γ-secretase cleavage of the amyloid-β precursor C99 protein as potential Alzheimer's disease therapeutics have been confounded by toxicity resulting from the inhibition of normal cleavage of Notch. We present biochemical and structural data for the combined transmembrane and juxtamembrane Notch domains (Notch-TMD) that illuminate Notch signaling and that can be compared and contrasted with the corresponding traits of C99. The Notch-TMD and C99 have very different conformations, adapt differently to changes in model membrane hydrophobic span, and exhibit different cholesterol-binding properties. These differences may be exploited in the design of agents that inhibit cleavage of C99 while allowing Notch cleavage.
Collapse
Affiliation(s)
- Catherine L. Deatherage
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37240, USA
- Center for Structural Biology and Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
| | - Zhenwei Lu
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37240, USA
- Center for Structural Biology and Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
| | - Brett M. Kroncke
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37240, USA
- Center for Structural Biology and Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
| | - Sirui Ma
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37240, USA
- Center for Structural Biology and Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
| | - Jarrod A. Smith
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37240, USA
- Center for Structural Biology and Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
| | - Markus W. Voehler
- Center for Structural Biology and Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
- Department of Chemistry, Vanderbilt University, Nashville, TN 37235, USA
| | - Robert L. McFeeters
- Department of Chemistry, University of Alabama in Huntsville, Huntsville, AL 35899, USA
| | - Charles R. Sanders
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37240, USA
- Center for Structural Biology and Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Corresponding author.
| |
Collapse
|
7
|
Jang J, Byun SH, Han D, Lee J, Kim J, Lee N, Kim I, Park S, Ha S, Kwon M, Ahn J, Chung WJ, Kweon DH, Cho JY, Kim S, Yoon K. Notch Intracellular Domain Deficiency in Nuclear Localization Activity Retains the Ability to Enhance Neural Stem Cell Character and Block Neurogenesis in Mammalian Brain Development. Stem Cells Dev 2014; 23:2841-50. [DOI: 10.1089/scd.2014.0031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Jiwon Jang
- School of Biological Sciences, Seoul National University, Seoul, Korea
| | - Sung-Hyun Byun
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Dasol Han
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Junsub Lee
- School of Biological Sciences, Seoul National University, Seoul, Korea
| | - Juwan Kim
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Nayeon Lee
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Inhee Kim
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Soojeong Park
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Soobong Ha
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Mookwang Kwon
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Jyhyun Ahn
- School of Biological Sciences, Seoul National University, Seoul, Korea
| | - Woo-Jae Chung
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Dae-Hyuk Kweon
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Jae Youl Cho
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| | - Sunyoung Kim
- School of Biological Sciences, Seoul National University, Seoul, Korea
| | - Keejung Yoon
- College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Korea
| |
Collapse
|
8
|
Stortchevoi AA. Intracellular Notch1 May Induce a Conformational Change in CSL/DNA, without Forming ICN1/CSL/DNA Molecular Complex, <i>in Vitro</i>. Cell 2013. [DOI: 10.4236/cellbio.2013.22010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
9
|
Song JK, Kannan R, Merdes G, Singh J, Mlodzik M, Giniger E. Disabled is a bona fide component of the Abl signaling network. Development 2010; 137:3719-27. [PMID: 20940230 DOI: 10.1242/dev.050948] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abl is an essential regulator of cell migration and morphogenesis in both vertebrates and invertebrates. It has long been speculated that the adaptor protein Disabled (Dab), which is a key regulator of neuronal migration in the vertebrate brain, might be a component of this signaling pathway, but this idea has been controversial. We now demonstrate that null mutations of Drosophila Dab result in phenotypes that mimic Abl mutant phenotypes, both in axon guidance and epithelial morphogenesis. The Dab mutant interacts genetically with mutations in Abl, and with mutations in the Abl accessory factors trio and enabled (ena). Genetic epistasis tests show that Dab functions upstream of Abl and ena, and, consistent with this, we show that Dab is required for the subcellular localization of these two proteins. We therefore infer that Dab is a bona fide component of the core Abl signaling pathway in Drosophila.
Collapse
Affiliation(s)
- Jeong K Song
- Axon Guidance and Neural Connectivity Unit, Basic Neuroscience Program, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA
| | | | | | | | | | | |
Collapse
|
10
|
Johnson SE, Ilagan MXG, Kopan R, Barrick D. Thermodynamic analysis of the CSL x Notch interaction: distribution of binding energy of the Notch RAM region to the CSL beta-trefoil domain and the mode of competition with the viral transactivator EBNA2. J Biol Chem 2009; 285:6681-92. [PMID: 20028974 DOI: 10.1074/jbc.m109.019968] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The Notch signaling pathway is a cell-cell communication network giving rise to cell differentiation during metazoan development. Activation of the pathway releases the intracellular portion of the Notch receptor to translocate to the nucleus, where it is able to interact with the effector transcription factor CSL, converting CSL from a transcriptional repressor to an activator. This conversion is dependent upon the high affinity binding of the RAM region of the Notch receptor to the beta-trefoil domain (BTD) of CSL. Here we probe the energetics of binding to BTD of each conserved residue of RAM through the use of isothermal titration calorimetry and single residue substitution. We find that although the highly conserved PhiW PhiP motif is the largest determinant of binding, energetically significant interactions are contributed by N-terminal residues, including a conserved Arg/Lys-rich region. Additionally, we present a thermodynamic analysis of the interaction between the Epstein-Barr virus protein EBNA2 with BTD and explore the extent to which the EBNA2- and RAM-binding sites on BTD are nonoverlapping, as proposed by Fuchs et al. (Fuchs, K. P., Bommer, G., Dumont, E., Christoph, B., Vidal, M., Kremmer, E., and Kempkes, B. (2001) Eur. J. Biochem. 268, 4639-4646). Combining these results with displacement isothermal titration calorimetry, we propose a mechanism by which the PhiW PhiP motif of RAM and EBNA2 compete with one another for binding at the hydrophobic pocket of BTD using overlapping but specific interactions that are unique to each BTD ligand.
Collapse
Affiliation(s)
- Scott E Johnson
- T. C. Jenkins Department of Biophysics, The Johns Hopkins University, Baltimore, Maryland 21218, USA
| | | | | | | |
Collapse
|
11
|
Sanders PGT, Muñoz-Descalzo S, Balayo T, Wirtz-Peitz F, Hayward P, Arias AM. Ligand-independent traffic of Notch buffers activated Armadillo in Drosophila. PLoS Biol 2009; 7:e1000169. [PMID: 19668359 PMCID: PMC2716527 DOI: 10.1371/journal.pbio.1000169] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Accepted: 07/02/2009] [Indexed: 12/13/2022] Open
Abstract
Full-length Notch receptor binds to the Wnt pathway effector β-catenin and mediates its endocytosis and degradation, demonstrating a novel mechanism by which Notch may modulate Wnt pathway activity. Notch receptors act as ligand-dependent membrane-tethered transcription factors with a prominent role in binary cell fate decisions during development, which is conserved across species. In addition there is increasing evidence for other functions of Notch, particularly in connection with Wnt signalling: Notch is able to modulate the activity of Armadillo/ß-catenin, the effector of Wnt signalling, in a manner that is independent of its transcriptional activity. Here we explore the mechanism of this interaction in the epithelium of the Drosophila imaginal discs and find that it is mediated by the ligand-independent endocytosis and traffic of the Notch receptor. Our results show that Notch associates with Armadillo near the adherens junctions and that it is rapidly endocytosed promoting the traffic of an activated form of Armadillo into endosomal compartments, where it may be degraded. As Notch has the ability to interact with and downregulate activated forms of Armadillo, it is possible that in vivo Notch regulates the transcriptionally competent pool of Armadillo. These interactions reveal a previously unknown activity of Notch, which serves to buffer the function of activated Armadillo and might underlie some of its transcription-independent effects. Establishment of the correct shape and pattern of tissues within an organism requires the integration of molecular information present in signalling and transcriptional networks and demands delicate exchanges and balances of their activities. A large body of experimental work has revealed close correlations in the activities of two pathways: Notch and Wnt, which suggest the existence of multiple links between them. Notch signalling relies in part upon the activity of the Notch protein, a membrane-bound receptor with a transcription factor domain that can be released from the membrane by proteolytic cleavage. On the other hand Wnt proteins are ligands that trigger changes in the activity of ß-catenin, which is called Armadillo in the fruit fly Drosophila melanogaster. In this study we uncover a previously unknown activity for Notch: endocytosis and trafficking of full length Notch, which targets Armadillo for degradation. This activity of Notch is independent of its ligands, Delta and Serrate, and of its downstream effector, the transcription factor Suppressor of Hairless. We further show that in the absence of Notch, which has been shown to act as a tumor suppressor in mammals, expression of an activated form of Armadillo causes tissue overgrowth and changes in the polarity of cells. Our results suggest that Drosophila Notch can promote the degradation of activated forms of Armadillo and may buffer cells against fluctuations in Wnt signalling activity.
Collapse
Affiliation(s)
- Phil G. T. Sanders
- Department of Genetics, University of Cambridge, Cambridge, United Kingdom
| | | | - Tina Balayo
- Department of Genetics, University of Cambridge, Cambridge, United Kingdom
| | | | - Penelope Hayward
- Department of Genetics, University of Cambridge, Cambridge, United Kingdom
| | | |
Collapse
|
12
|
Interaction between Reelin and Notch signaling regulates neuronal migration in the cerebral cortex. Neuron 2008; 60:273-84. [PMID: 18957219 PMCID: PMC2913541 DOI: 10.1016/j.neuron.2008.09.026] [Citation(s) in RCA: 173] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2008] [Revised: 06/25/2008] [Accepted: 09/10/2008] [Indexed: 01/21/2023]
Abstract
Neuronal migration is a fundamental component of brain development whose failure is associated with various neurological and psychiatric disorders. Reelin is essential for the stereotypical inside-out sequential lamination of the neocortex, but the molecular mechanisms of its action still remain unclear. Here we show that regulation of Notch activity plays an important part in Reelin-signal-dependent neuronal migration. We found that Reelin-deficient mice have reduced levels of the cleaved form of Notch intracellular domain (Notch ICD) and that loss of Notch signaling in migrating neurons results in migration and morphology defects. Further, overexpression of Notch ICD mitigates the laminar and morphological abnormalities of migrating neurons in Reeler. Finally, our in vitro biochemical studies show that Reelin signaling inhibits Notch ICD degradation via Dab1. Together, our results indicate that neuronal migration in the developing cerebral cortex requires a Reelin-Notch interaction.
Collapse
|
13
|
Le Gall M, De Mattei C, Giniger E. Molecular separation of two signaling pathways for the receptor, Notch. Dev Biol 2007; 313:556-67. [PMID: 18062953 DOI: 10.1016/j.ydbio.2007.10.030] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2007] [Revised: 10/18/2007] [Accepted: 10/23/2007] [Indexed: 10/22/2022]
Abstract
Notch is required for many aspects of cell fate specification and morphogenesis during development, including neurogenesis and axon guidance. We here provide genetic and biochemical evidence that Notch directs axon growth and guidance in Drosophila via a "non-canonical", i.e. non-Su(H)-mediated, signaling pathway, characterized by association with the adaptor protein, Disabled, and Trio, an accessory factor of the Abl tyrosine kinase. We find that forms of Notch lacking the binding sites for its canonical effector, Su(H), are nearly inactive for the cell fate function of the receptor, but largely or fully active in axon patterning. Conversely, deletion from Notch of the binding site for Disabled impairs its action in axon patterning without disturbing cell fate control. Finally, we show by co-immunoprecipitation that Notch protein is physically associated in vivo with both Disabled and Trio. Together, these data provide evidence for an alternate Notch signaling pathway that mediates a postmitotic, morphogenetic function of the receptor.
Collapse
Affiliation(s)
- Maude Le Gall
- Axon Guidance and Neural Connectivity Unit, Basic Neuroscience Program, National Institute of Neurological Disorders and Stroke (NINDS), National Institutes of Health, Bldg. 37, Rm. 1016, 37 Convent Drive, Bethesda, MD 20892, USA
| | | | | |
Collapse
|
14
|
Kovall RA. Structures of CSL, Notch and Mastermind proteins: piecing together an active transcription complex. Curr Opin Struct Biol 2006; 17:117-27. [PMID: 17157496 DOI: 10.1016/j.sbi.2006.11.004] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2006] [Revised: 10/18/2006] [Accepted: 11/27/2006] [Indexed: 01/05/2023]
Abstract
Notch signaling mediates communication between cells, and is essential for proper cell fate decisions in the developing embryo and the adult organism. Signaling initiates proteolytic release of the receptor Notch from the membrane, whereupon the intracellular portion of Notch (NotchIC) localizes to the nucleus and engages the DNA-binding transcription factor CSL. CSL is required for both repression and activation of Notch target genes, and is the focal point of a transcriptional switch, mediating interactions with transcriptional coregulators. Activation of transcription requires corepressor displacement from CSL by NotchIC and the recruitment of the transcriptional coactivator Mastermind to the complex. Several recently determined and exciting structures of CSL, NotchIC, and an active transcription complex composed of CSL, NotchIC and Mastermind have revealed new insights into transcriptional regulation in the Notch pathway.
Collapse
Affiliation(s)
- Rhett A Kovall
- Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0524, USA.
| |
Collapse
|
15
|
Lubman OY, Ilagan MXG, Kopan R, Barrick D. Quantitative dissection of the Notch:CSL interaction: insights into the Notch-mediated transcriptional switch. J Mol Biol 2006; 365:577-89. [PMID: 17070841 PMCID: PMC1851696 DOI: 10.1016/j.jmb.2006.09.071] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2006] [Revised: 09/25/2006] [Accepted: 09/25/2006] [Indexed: 12/11/2022]
Abstract
Complex formation between the intracellular domain of the Notch receptor (NICD) and the transcription factor CSL is indispensable for transcriptional activation. To understand how NICD displaces CSL-associated co-repressors, we have quantified the binding of different Notch1 ICD regions to a key interaction domain (the beta trefoil domain, or BTD) of human CSL. Electrophoresis, scattering, and titration calorimetry indicate that NICD and BTD combine to form a 1:1 heterodimer. Neither the Notch1 ankyrin domain (ANK) nor C-terminal region contributes binding energy towards BTD. In contrast, binding energy is attributed largely to a short segment including the conserved WFP sequence motif within the RAM region (the approximately 140 residue polypeptide segment N-terminal to the ANK domain); substitution of this motif substantially reduces affinity. Short (< or =25 residues) WFP-containing peptides encoded by the four mammalian Notch genes have similar affinities to BTD; thus, activity differences between paralogues either result from other regions of NICD and CSL or from differences in interaction with downstream components. The importance of RAM was demonstrated by the ability of a short RAM peptides to dissociate NICD:CSL interaction in cellular lysates. These results support an emerging molecular mechanism for the displacement of co-repressors from DNA-bound CSL by NICD.
Collapse
Affiliation(s)
- Olga Y. Lubman
- T.C Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, MD, USA
- Department of Molecular Biology and Pharmacology and Department of Medicine, Washington University School of Medicine, Saint Louis, MO, USA
| | - Ma. Xenia G. Ilagan
- Department of Molecular Biology and Pharmacology and Department of Medicine, Washington University School of Medicine, Saint Louis, MO, USA
| | - Raphael Kopan
- Department of Molecular Biology and Pharmacology and Department of Medicine, Washington University School of Medicine, Saint Louis, MO, USA
- *Authors to whom correspondence should be addressed: Doug Barrick, Phone: (410) 516-0409; Fax: (410) 516-4118: E-mail: , Raphael Kopan, Phone: (314) 747-5520; Fax: (314) 362-7058: E-mail:
| | - Doug Barrick
- T.C Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, MD, USA
- *Authors to whom correspondence should be addressed: Doug Barrick, Phone: (410) 516-0409; Fax: (410) 516-4118: E-mail: , Raphael Kopan, Phone: (314) 747-5520; Fax: (314) 362-7058: E-mail:
| |
Collapse
|
16
|
Langdon T, Hayward P, Brennan K, Wirtz-Peitz F, Sanders P, Zecchini V, Friday A, Balayo T, Martinez Arias A. Notch receptor encodes two structurally separable functions inDrosophila: A genetic analysis. Dev Dyn 2006; 235:998-1013. [PMID: 16534797 DOI: 10.1002/dvdy.20735] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The Notch gene of Drosophila encodes a single transmembrane receptor that plays a central role in the process of lateral inhibition. This process results in the selection of individual mesodermal and neural precursors during the development of the muscular and nervous systems. The activation of Notch during lateral inhibition is mediated by the transmembrane ligand Delta (Dl) and effected by the transcription factor Suppressor of Hairless (Su(H)). The same functional cassette plays a role in other processes, in particular, the development and patterning of the wing. Genetic analysis has suggested that, in addition to the Su(H)-dependent pathway, Notch can signal in an Su(H)-independent manner. This process seems to be tightly associated with signalling by Wingless, a member of the Wnt family of signalling molecules. Here, we have analyzed further the possibility that the Notch protein encodes two different functions. To do so, we have studied the activities and genetic properties of different Notch receptors bearing deletions of specific regions of the intracellular and the extracellular domains in different developmental processes, and have sought to correlate the activity of these mutant proteins with those of existing mutants in Notch. Our results support the existence of at least two different activities of Notch each of which can be associated with specific structural domains.
Collapse
Affiliation(s)
- Tim Langdon
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, U.K
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
LeComte M, Wesley UV, Mok LP, Shepherd A, Wesley C. Evidence for the involvement of dominant-negative Notch molecules in the normal course of Drosophila development. Dev Dyn 2006; 235:411-26. [PMID: 16331645 DOI: 10.1002/dvdy.20650] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Notch signaling is used to specify cell types during animal development. A high level specifies one cell type, whereas a low level specifies the alternate type. The effector of Notch signaling is the Notch intracellular domain. Upon its release from the plasma membrane in response to Delta binding the Notch extracellular domain, the Notch intracellular domain combines with the transcription factor Suppressor of Hairless and promotes the expression of target genes. Using a panel of antibodies made against different extracellular and intracellular regions of Notch, we show that cell types and tissues with low levels of Notch signaling are enriched for Notch molecules detected only by the extracellular domain antibodies. This enrichment often follows enrichment for Notch molecules detected only by antibodies made against the Suppressor of Hairless binding region. Notch molecules lacking most of the intracellular domain or containing only the Suppressor of Hairless binding region are produced during development. Such molecules are known to suppress Notch signaling, possibly by taking away Delta or Suppressor of Hairless from the full-length Notch. Thus, it is possible that dominant-negative Notch molecules are produced in the normal course of tissue differentiation in Drosophila as part of an auto-down-regulation mechanism.
Collapse
Affiliation(s)
- Matthew LeComte
- Department of Microbiology and Molecular Genetics, The University of Vermont, Burlington, Vermont 05405, USA
| | | | | | | | | |
Collapse
|
18
|
Ong CT, Cheng HT, Chang LW, Ohtsuka T, Kageyama R, Stormo GD, Kopan R. Target selectivity of vertebrate notch proteins. Collaboration between discrete domains and CSL-binding site architecture determines activation probability. J Biol Chem 2005; 281:5106-19. [PMID: 16365048 DOI: 10.1074/jbc.m506108200] [Citation(s) in RCA: 178] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
All four mammalian Notch proteins interact with a single DNA-binding protein (RBP-jkappa), yet they are not equivalent in activating target genes. Parallel assays of three Notch-responsive promoters in several cell lines revealed that relative activation strength is dependent on protein module and promoter context more than the cellular context. Each Notch protein reads binding site orientation and distribution on the promoter differently; Notch1 performs extremely well on paired sites, and Notch3 prefers single sites in conjunction with a proximal zinc finger transcription factor. Although head-head sites can elicit a Notch response on their own, use of CBS (CSL binding site) in tail-tail orientation is context-dependent. Bias for specific DNA elements is achieved by interplay between the N-terminal RAM (RBP-jkappa-associated molecule/ankyrin region), which interprets CBS proximity and orientation, and the C-terminal transactivation domain that interacts specifically with the transcription machinery or nearby factors. To confirm the prediction that modular design underscores the evolution of functional divergence between Notch proteins, we generated a synthetic Notch protein (Notch1 ankyrin with Notch3 transactivation domain) that displayed superior signaling strength on the hes5 promoter. Consistent with the prediction that "preferred" targets (Hes1) should respond faster and at lower Notch concentration than other targets, we showed that Hes5-GFP was extinguished fast and recovered slowly, whereas Hes1-GFP was inhibited late and recovered quickly after a pulse of DAPT in metanephroi cultures.
Collapse
MESH Headings
- Animals
- Base Sequence
- Basic Helix-Loop-Helix Transcription Factors/chemistry
- Binding Sites
- Blotting, Western
- Cell Line
- Cell Line, Tumor
- DNA/chemistry
- Dose-Response Relationship, Drug
- Female
- Gene Deletion
- Green Fluorescent Proteins/chemistry
- Green Fluorescent Proteins/metabolism
- HeLa Cells
- Homeodomain Proteins/chemistry
- Humans
- Immunohistochemistry
- Kinetics
- Luciferases/metabolism
- Male
- Mice
- Models, Biological
- Models, Genetic
- Models, Statistical
- Molecular Sequence Data
- NIH 3T3 Cells
- Organ Culture Techniques
- Promoter Regions, Genetic
- Protein Binding
- Protein Structure, Tertiary
- Receptors, Notch/metabolism
- Repressor Proteins/chemistry
- Time Factors
- Transcription Factor HES-1
- Transcription Factors/metabolism
- Transcription, Genetic
- Transcriptional Activation
- Transfection
Collapse
Affiliation(s)
- Chin-Tong Ong
- Department of Molecular Biology and Pharmacology, Division of Dermatology, Washington University School of Medicine, St. Louis, Missouri 63110, USA
| | | | | | | | | | | | | |
Collapse
|