101
|
Wood DJ, Endicott JA. Structural insights into the functional diversity of the CDK-cyclin family. Open Biol 2019; 8:rsob.180112. [PMID: 30185601 PMCID: PMC6170502 DOI: 10.1098/rsob.180112] [Citation(s) in RCA: 141] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 08/10/2018] [Indexed: 12/17/2022] Open
Abstract
Since their characterization as conserved modules that regulate progression through the eukaryotic cell cycle, cyclin-dependent protein kinases (CDKs) in higher eukaryotic cells are now also emerging as significant regulators of transcription, metabolism and cell differentiation. The cyclins, though originally characterized as CDK partners, also have CDK-independent roles that include the regulation of DNA damage repair and transcriptional programmes that direct cell differentiation, apoptosis and metabolic flux. This review compares the structures of the members of the CDK and cyclin families determined by X-ray crystallography, and considers what mechanistic insights they provide to guide functional studies and distinguish CDK- and cyclin-specific activities. Aberrant CDK activity is a hallmark of a number of diseases, and structural studies can provide important insights to identify novel routes to therapy.
Collapse
Affiliation(s)
- Daniel J Wood
- Newcastle Cancer Centre, Northern Institute for Cancer Research, Medical School, Newcastle University, Paul O'Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Jane A Endicott
- Newcastle Cancer Centre, Northern Institute for Cancer Research, Medical School, Newcastle University, Paul O'Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| |
Collapse
|
102
|
Lu YC, Wang P, Wu QG, Zhang RK, Kong A, Li YF, Lee SC. Hsp74/14-3-3σ Complex Mediates Centrosome Amplification by High Glucose, Insulin, and Palmitic Acid. Proteomics 2019; 19:e1800197. [PMID: 30688006 DOI: 10.1002/pmic.201800197] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 12/26/2018] [Indexed: 01/08/2023]
Abstract
It has been reported recently that type 2 diabetes promotes centrosome amplification via 14-3-3σ/ROCK1 complex. In the present study, 14-3-3σ interacting proteins are characterized and their roles in the centrosome amplification by high glucose, insulin, and palmitic acid are investigated. Co-immunoprecipitation in combination with MS analysis identified 134 proteins that interact with 14-3-3σ, which include heat shock 70 kDa protein 4 (Hsp74). Gene ontology analyses reveal that many of them are enriched in binding activity. Kyoto Encyclopedia of Genes and Genomes analysis shows that the top three enriched pathways are ribosome, carbon metabolism, and biosynthesis of amino acids. Molecular and functional investigations show that the high glucose, insulin, and palmitic acid increase the expression and binding of 14-3-3σ and Hsp74 as well as centrosome amplification, all of which are inhibited by knockdown of 14-3-3σ or Hsp74. Moreover, molecular docking analysis shows that the interaction between the 14-3-3σ and the Hsp74 is mainly through hydrophobic contacts and a lesser degree ionic interactions and hydrogen bond by different amino acids residues. In conclusion, the results suggest that the experimental treatment triggers centrosome amplification via upregulations of expression and binding of 14-3-3σ and Hsp74.
Collapse
Affiliation(s)
- Yu Cheng Lu
- School of Life Sciences, Shanxi University, Taiyuan, Shanxi, 030006, P. R. China.,Central Laboratory, Linyi People's Hospital, Linyi, Shandong, 276000, P. R. China
| | - Pu Wang
- School of Life Sciences, Shanxi University, Taiyuan, Shanxi, 030006, P. R. China
| | - Qi Gui Wu
- School of Life Sciences, Shanxi University, Taiyuan, Shanxi, 030006, P. R. China
| | - Rui Kai Zhang
- School of Life Sciences, Shanxi University, Taiyuan, Shanxi, 030006, P. R. China
| | - Alice Kong
- Department of Medicine and Therapeutics, the Chinese University of Hong Kong, Shatin, Hong Kong SAR, 999077, P. R. China
| | - Yuan Fei Li
- Department of Oncology, First Clinical Hospital of Shanxi Medical University, Taiyuan, Shanxi, 030001, P. R. China
| | - Shao Chin Lee
- School of Life Sciences, Shanxi University, Taiyuan, Shanxi, 030006, P. R. China.,School of Life Sciences, Jiangsu Normal University, Xuzhou, Jiangsu, 221010, P. R. China
| |
Collapse
|
103
|
Amano M, Nishioka T, Tsuboi D, Kuroda K, Funahashi Y, Yamahashi Y, Kaibuchi K. Comprehensive analysis of kinase-oriented phospho-signalling pathways. J Biochem 2018; 165:301-307. [DOI: 10.1093/jb/mvy115] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 12/15/2018] [Indexed: 02/01/2023] Open
Affiliation(s)
- Mutsuki Amano
- Department of Cell Pharmacology, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi, Japan
| | - Tomoki Nishioka
- Department of Cell Pharmacology, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi, Japan
| | - Daisuke Tsuboi
- Department of Cell Pharmacology, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi, Japan
| | - Keisuke Kuroda
- Department of Cell Pharmacology, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi, Japan
| | - Yasuhiro Funahashi
- Department of Cell Pharmacology, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi, Japan
| | - Yukie Yamahashi
- Department of Cell Pharmacology, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi, Japan
| | - Kozo Kaibuchi
- Department of Cell Pharmacology, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi, Japan
| |
Collapse
|
104
|
Aper SJA, den Hamer A, Wouters SFA, Lemmens LJM, Ottmann C, Brunsveld L, Merkx M. Protease-Activatable Scaffold Proteins as Versatile Molecular Hubs in Synthetic Signaling Networks. ACS Synth Biol 2018; 7:2216-2225. [PMID: 30125482 PMCID: PMC6154215 DOI: 10.1021/acssynbio.8b00217] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Protease signaling and scaffold-induced control of protein-protein interactions represent two important mechanisms for intracellular signaling. Here we report a generic and modular approach to control the activity of scaffolding proteins by protease activity, creating versatile molecular platforms to construct synthetic signaling networks. Using 14-3-3 proteins as a structurally well-characterized and important class of scaffold proteins, three different architectures were explored to achieve optimal protease-mediated control of scaffold activity, fusing either one or two monovalent inhibitory ExoS peptides or a single bivalent ExoS peptide to T14-3-3 using protease-cleavable linkers. Analysis of scaffolding activity before and after protease-induced cleavage revealed optimal control of 14-3-3 activity for the system that contained monovalent ExoS peptides fused to both the N-and C-terminus, each blocking a single T14-3-3 binding site. The protease-activatable 14-3-3 scaffolds were successfully applied to construct a three-step signaling cascade in which dimerization and activation of FGG-caspase-9 on an orthogonal supramolecular platform resulted in activation of a 14-3-3 scaffold, which in turn allowed 14-3-3-templated complementation of a split-luciferase. In addition, by combining 14-3-3-templated activation of caspase-9 with a caspase-9-activatable 14-3-3 scaffold, the first example of a synthetic self-activating protease signaling network was created. Protease-activatable 14-3-3 proteins thus represent a modular platform whose properties can be rationally engineered to fit different applications, both to create artificial in vitro synthetic molecular networks and as a novel signaling hub to re-engineer intracellular signaling pathways.
Collapse
Affiliation(s)
- Stijn J. A. Aper
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Anniek den Hamer
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Simone F. A. Wouters
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Lenne J. M. Lemmens
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Christian Ottmann
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Luc Brunsveld
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Maarten Merkx
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| |
Collapse
|
105
|
Karlberg T, Hornyak P, Pinto AF, Milanova S, Ebrahimi M, Lindberg M, Püllen N, Nordström A, Löverli E, Caraballo R, Wong EV, Näreoja K, Thorsell AG, Elofsson M, De La Cruz EM, Björkegren C, Schüler H. 14-3-3 proteins activate Pseudomonas exotoxins-S and -T by chaperoning a hydrophobic surface. Nat Commun 2018; 9:3785. [PMID: 30224724 PMCID: PMC6141617 DOI: 10.1038/s41467-018-06194-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 08/15/2018] [Indexed: 12/11/2022] Open
Abstract
Pseudomonas are a common cause of hospital-acquired infections that may be lethal. ADP-ribosyltransferase activities of Pseudomonas exotoxin-S and -T depend on 14-3-3 proteins inside the host cell. By binding in the 14-3-3 phosphopeptide binding groove, an amphipathic C-terminal helix of ExoS and ExoT has been thought to be crucial for their activation. However, crystal structures of the 14-3-3β:ExoS and -ExoT complexes presented here reveal an extensive hydrophobic interface that is sufficient for complex formation and toxin activation. We show that C-terminally truncated ExoS ADP-ribosyltransferase domain lacking the amphipathic binding motif is active when co-expressed with 14-3-3. Moreover, swapping the amphipathic C-terminus with a fragment from Vibrio Vis toxin creates a 14-3-3 independent toxin that ADP-ribosylates known ExoS targets. Finally, we show that 14-3-3 stabilizes ExoS against thermal aggregation. Together, this indicates that 14-3-3 proteins activate exotoxin ADP-ribosyltransferase domains by chaperoning their hydrophobic surfaces independently of the amphipathic C-terminal segment. The cellular toxicity of Pseudomonas exotoxin-S and -T depends on their activation by 14-3-3 but the underlying molecular mechanism is not fully understood. Here, the authors show that a previously unrecognized 14-3-3:exotoxin binding interface is sufficient for complex formation and toxin activation.
Collapse
Affiliation(s)
- Tobias Karlberg
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden
| | - Peter Hornyak
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden
| | - Ana Filipa Pinto
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden
| | - Stefina Milanova
- Department of Cellular and Molecular Biology, Karolinska Institutet, Berzelius väg 35, 17165, Solna, Sweden
| | - Mahsa Ebrahimi
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden
| | - Mikael Lindberg
- Protein Expertise Platform, Umeå University, Kemihuset, 90187, Umeå, Sweden
| | - Nikolai Püllen
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden
| | - Axel Nordström
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden
| | - Elinor Löverli
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden
| | - Rémi Caraballo
- Department of Chemistry, Umeå University, Kemihuset, 90187, Umeå, Sweden
| | - Emily V Wong
- Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520, USA.,University of California, San Francisco Medical School, Department of Biochemistry and Biophysics, San Francisco, CA, 94158, USA
| | - Katja Näreoja
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden
| | - Ann-Gerd Thorsell
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden
| | - Mikael Elofsson
- Department of Chemistry, Umeå University, Kemihuset, 90187, Umeå, Sweden
| | - Enrique M De La Cruz
- Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520, USA
| | - Camilla Björkegren
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden.,Department of Cellular and Molecular Biology, Karolinska Institutet, Berzelius väg 35, 17165, Solna, Sweden
| | - Herwig Schüler
- Department of Biosciences and Nutrition, Karolinska Institutet, Hälsovägen 4c, 14157, Huddinge, Sweden.
| |
Collapse
|
106
|
Hou Y, Zang D, Li X, Li F. Effect of cytokine-induced killer cells combined with dendritic cells on the survival rate and expression of 14-3-3ζ and p-Bad proteins in Lewis lung cancer cell lines. Oncol Lett 2018; 16:1815-1820. [PMID: 30008870 DOI: 10.3892/ol.2018.8834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Accepted: 02/23/2018] [Indexed: 11/06/2022] Open
Abstract
In the present study, the function and mechanism of cytokine-induced killer cells (CIK) combined with dendritic cells (DC-CIK) were examined in Lewis lung cancer (LLC) cells. Co-culture of CIK dendritic cells (DC) in vitro was used to investigate their proliferation and the antitumor effects on LLC cells. DC and CIK cells were collected from healthy human peripheral blood mononuclear cells and co-cultured as an experimental group, while LLC cells were cultured alone as a control group. Cell morphology was observed by an inverted microscope and an MTT assay was utilized to detect the proliferation of LLC cells. Expression of 14-3-3ζ and p-Bad were measured by western blot analysis. Compared with the control group, treatment of LLC cells with DC-CIK resulted in decreased cell adherence, reduced cell proliferation and abnormal morphological changes. Additionally, DC-CIK treatment of LLC cells resulted in the decreased expression of 14-3-3ζ and p-Bad protein in LLC cells, which may provide important information pertaining to the possible mechanism of DC-CIK-induced antitumor activity against LLC cells. The present study provides a theoretical and experimental basis for the clinical treatment of DC-CIK cell co-culture.
Collapse
Affiliation(s)
- Yang Hou
- Life Science Institute of Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
| | - Dongyu Zang
- Department of Thoraxes Surgery of The Third Affiliated Hospital, Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
| | - Xiaoming Li
- Department of Histology and Embryology, Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
| | - Fuzhi Li
- Department of Thoraxes Surgery of The Third Affiliated Hospital, Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
| |
Collapse
|
107
|
14-3-3 protein directly interacts with the kinase domain of calcium/calmodulin-dependent protein kinase kinase (CaMKK2). Biochim Biophys Acta Gen Subj 2018; 1862:1612-1625. [DOI: 10.1016/j.bbagen.2018.04.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 04/05/2018] [Accepted: 04/06/2018] [Indexed: 01/04/2023]
|
108
|
Wakabayashi K, Umahara T, Hirokawa K, Hanyu H, Uchihara T. 14-3-3 protein sigma isoform co-localizes with phosphorylated α-synuclein in Lewy bodies and Lewy neurites in patients with Lewy body disease. Neurosci Lett 2018; 674:171-175. [DOI: 10.1016/j.neulet.2018.03.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 02/22/2018] [Accepted: 03/06/2018] [Indexed: 01/12/2023]
|
109
|
14-3-3 proteins in platelet biology and glycoprotein Ib-IX signaling. Blood 2018; 131:2436-2448. [PMID: 29622550 DOI: 10.1182/blood-2017-09-742650] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 03/25/2018] [Indexed: 12/16/2022] Open
Abstract
Members of the 14-3-3 family of proteins function as adapters/modulators that recognize phosphoserine/phosphothreonine-based binding motifs in many intracellular proteins and play fundamental roles in signal transduction pathways of eukaryotic cells. In platelets, 14-3-3 plays a wide range of regulatory roles in phosphorylation-dependent signaling pathways, including G-protein signaling, cAMP signaling, agonist-induced phosphatidylserine exposure, and regulation of mitochondrial function. In particular, 14-3-3 interacts with several phosphoserine-dependent binding sites in the major platelet adhesion receptor, the glycoprotein Ib-IX complex (GPIb-IX), regulating its interaction with von Willebrand factor (VWF) and mediating VWF/GPIb-IX-dependent mechanosignal transduction, leading to platelet activation. The interaction of 14-3-3 with GPIb-IX also plays a critical role in enabling the platelet response to low concentrations of thrombin through cooperative signaling mediated by protease-activated receptors and GPIb-IX. The various functions of 14-3-3 in platelets suggest that it is a possible target for the treatment of thrombosis and inflammation.
Collapse
|
110
|
Centorrino F, Ballone A, Wolter M, Ottmann C. Biophysical and structural insight into the USP8/14‐3‐3 interaction. FEBS Lett 2018; 592:1211-1220. [DOI: 10.1002/1873-3468.13017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 02/15/2018] [Accepted: 02/19/2018] [Indexed: 01/03/2023]
Affiliation(s)
- Federica Centorrino
- Laboratory of Chemical Biology Department of Biomedical Engineering Institute for Complex Molecular Systems Eindhoven University of Technology The Netherlands
| | - Alice Ballone
- Laboratory of Chemical Biology Department of Biomedical Engineering Institute for Complex Molecular Systems Eindhoven University of Technology The Netherlands
| | - Madita Wolter
- Laboratory of Chemical Biology Department of Biomedical Engineering Institute for Complex Molecular Systems Eindhoven University of Technology The Netherlands
| | - Christian Ottmann
- Laboratory of Chemical Biology Department of Biomedical Engineering Institute for Complex Molecular Systems Eindhoven University of Technology The Netherlands
- Department of Chemistry University of Duisburg‐Essen Germany
| |
Collapse
|
111
|
Abstract
Selective enrichment of the polyphosphoinositides (PPIn), such as PtdIns(4,5)P2 and PtdIns4P, helps to determine the identity of the plasma membrane (PM) and regulates many aspects of cell biology through a vast number of protein effectors. Polarity proteins had long been assumed to be non-PPIn-binding proteins that mainly associate with PM/cell cortex through their extensive protein-protein interaction network. However, recent studies began to reveal that several key polarity proteins electrostatically bind to PPIn through their positively charged protein domains or structures and such PPIn-binding property is essential for their direct and specific attachment to PM. Although the physical nature of the charge-based PPIn binding appears to be simple and nonspecific, it serves as an elegant mechanism that can be efficiently and specifically regulated for achieving polarized PM targeting of polarity proteins. As an unexpected consequence, subcellular localization of PPIn-binding polarity proteins are also subject to regulations by physiological conditions such as hypoxia and ischemia that acutely and reversibly depletes PPIn from PM.
Collapse
Affiliation(s)
- Gerald R Hammond
- Department of Cell Biology, University of Pittsburgh Medical School, Pittsburgh, Pennsylvania 15261
| | - Yang Hong
- Department of Cell Biology, University of Pittsburgh Medical School, Pittsburgh, Pennsylvania 15261
| |
Collapse
|
112
|
Wang X, Cheng D, Jiang W, Ma Y. Mechanisms Underlying Aluminum Neurotoxicity Related to 14-3-3ζ Protein. Toxicol Sci 2018; 163:45-56. [DOI: 10.1093/toxsci/kfy021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Xiaomei Wang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, People’s Republic of China
| | - Dai Cheng
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, People’s Republic of China
- College of Food Engineering and Biotechnology, Tianjin University of Science and Technology, Tianjin, People’s Republic of China
| | - Weibo Jiang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, People’s Republic of China
| | - Yuxia Ma
- Department of Nutrition and Hygiene, Hebei Medical University, Shijiazhuang, China
| |
Collapse
|
113
|
Suppressor of fused (Sufu) promotes epithelial-mesenchymal transition (EMT) in cervical squamous cell carcinoma. Oncotarget 2017; 8:114226-114238. [PMID: 29371981 PMCID: PMC5768398 DOI: 10.18632/oncotarget.23176] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 11/13/2017] [Indexed: 12/01/2022] Open
Abstract
Suppressor of fused is essential for the maximal activation of Sonic Hedgehog signaling in development and tumorigenesis. However, the role of Sufu in cervical carcinoma remains unknown. Here, we report new findings of Sufu in regulating the epithelial-to-mesenchymal transition through the FoxM1 transcriptional modulation by 14-3-3ζ protein in cervical carcinoma. Sufu is overexpressed in cervical squamous cell carcinoma and its level in clinical tumor tissues is positively correlated with 14-3-3ζ. Functionanlly, siSufu remarkably prevents the cancer cell migration and invasion. We further demonstrate that the transcriptional activity of Sufu is increased by FoxM1, of which stability is promoted by 14-3-3ζ. Knockdown FoxM1 decreases the invasion of SiHa cells and reconstitution of Sufu rescues the invasion of these cells.Finally, overexpression of Sufu is significantly associated with differentiation grade, FIGO stage, Depth of stromal invasion and vascular cancer embolus. Our findings highlight a novel role for Sufu in cervical carcinogenesis.
Collapse
|
114
|
Sluchanko NN. Association of Multiple Phosphorylated Proteins with the 14-3-3 Regulatory Hubs: Problems and Perspectives. J Mol Biol 2017; 430:20-26. [PMID: 29180038 DOI: 10.1016/j.jmb.2017.11.010] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 11/21/2017] [Accepted: 11/22/2017] [Indexed: 01/11/2023]
Abstract
14-3-3 proteins are well-known universal regulators binding a vast number of partners by recognizing their phosphorylated motifs, typically located within the intrinsically disordered regions. The abundance of such phosphomotifs ensures the involvement of 14-3-3 proteins in sophisticated protein-protein interaction networks that govern vital cellular processes. Thousands of 14-3-3 partners have been either experimentally identified or predicted, but the spatiotemporal hierarchy of the processes based on 14-3-3 interactions is not clearly understood. This is exacerbated by the lack of available structural information on full regulatory complexes involving 14-3-3, which resist high-resolution structural studies due to the presence of intrinsically disordered regions. Although deducing three-dimensional structures is of particular urgency, structural advances are lagging behind the rate at which novel 14-3-3 partners are discovered. Here I attempted to critically review the current state of the field and in particular to dissect the unknowns, focusing on questions that could help in moving the frontiers forward.
Collapse
Affiliation(s)
- Nikolai N Sluchanko
- A.N. Bach Institute of Biochemistry, Federal Research Center "Fundamentals of Biotechnology" of the Russian Academy of Sciences, 119071 Moscow, Russian Federation; Department of Biophysics, School of Biology, Moscow State University, 119991 Moscow, Russian Federation.
| |
Collapse
|
115
|
Utrilla RG, Nieto-Marín P, Alfayate S, Tinaquero D, Matamoros M, Pérez-Hernández M, Sacristán S, Ondo L, de Andrés R, Díez-Guerra FJ, Tamargo J, Delpón E, Caballero R. Kir2.1-Nav1.5 Channel Complexes Are Differently Regulated than Kir2.1 and Nav1.5 Channels Alone. Front Physiol 2017; 8:903. [PMID: 29184507 PMCID: PMC5694551 DOI: 10.3389/fphys.2017.00903] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 10/25/2017] [Indexed: 12/27/2022] Open
Abstract
Cardiac Kir2.1 and Nav1.5 channels generate the inward rectifier K+ (IK1) and the Na+ (INa) currents, respectively. There is a mutual interplay between the ventricular INa and IK1 densities, because Nav1.5 and Kir2.1 channels exhibit positive reciprocal modulation. Here we compared some of the biological properties of Nav1.5 and Kir2.1 channels when they are expressed together or separately to get further insights regarding their putative interaction. First we demonstrated by proximity ligation assays (PLAs) that in the membrane of ventricular myocytes Nav1.5 and Kir2.1 proteins are in close proximity to each other (<40 nm apart). Furthermore, intracellular dialysis with anti-Nav1.5 and anti-Kir2.1 antibodies suggested that these channels form complexes. Patch-clamp experiments in heterologous transfection systems demonstrated that the inhibition of the Ca2+/calmodulin-dependent protein kinase II (CaMKII) decreased the INa and the IK1 generated by Nav1.5 and Kir2.1 channels when they were coexpressed, but not the IK1 generated by Kir2.1 channels alone, suggesting that complexes, but not Kir2.1 channels, are a substrate of CaMKII. Furthermore, inhibition of CaMKII precluded the interaction between Nav1.5 and Kir2.1 channels. Inhibition of 14-3-3 proteins did not modify the INa and IK1 densities generated by each channel separately, whereas it decreased the INa and IK1 generated when they were coexpressed. However, inhibition of 14-3-3 proteins did not abolish the Nav1.5-Kir2.1 interaction. Inhibition of dynamin-dependent endocytosis reduced the internalization of Kir2.1 but not of Nav1.5 or Kir2.1-Nav1.5 complexes. Inhibition of cytoskeleton-dependent vesicular trafficking via the dynein/dynactin motor increased the IK1, but reduced the INa, thus suggesting that the dynein/dynactin motor is preferentially involved in the backward and forward traffic of Kir2.1 and Nav1.5, respectively. Conversely, the dynein/dynactin motor participated in the forward movement of Kir2.1-Nav1.5 complexes. Ubiquitination by Nedd4-2 ubiquitin-protein ligase promoted the Nav1.5 degradation by the proteasome, but not that of Kir2.1 channels. Importantly, the Kir2.1-Nav1.5 complexes were degraded following this route as demonstrated by the overexpression of Nedd4-2 and the inhibition of the proteasome with MG132. These results suggested that Kir2.1 and Nav1.5 channels closely interact with each other leading to the formation of a pool of complexed channels whose biology is similar to that of the Nav1.5 channels.
Collapse
Affiliation(s)
- Raquel G Utrilla
- Department of Pharmacology, School of Medicine, Instituto de Investigación Sanitaria Gregorio Marañón, Universidad Complutense, Madrid, Spain.,CIBERCV, Madrid, Spain
| | - Paloma Nieto-Marín
- Department of Pharmacology, School of Medicine, Instituto de Investigación Sanitaria Gregorio Marañón, Universidad Complutense, Madrid, Spain.,CIBERCV, Madrid, Spain
| | - Silvia Alfayate
- Department of Pharmacology, School of Medicine, Instituto de Investigación Sanitaria Gregorio Marañón, Universidad Complutense, Madrid, Spain.,CIBERCV, Madrid, Spain
| | - David Tinaquero
- Department of Pharmacology, School of Medicine, Instituto de Investigación Sanitaria Gregorio Marañón, Universidad Complutense, Madrid, Spain.,CIBERCV, Madrid, Spain
| | - Marcos Matamoros
- Department of Pharmacology, School of Medicine, Instituto de Investigación Sanitaria Gregorio Marañón, Universidad Complutense, Madrid, Spain.,CIBERCV, Madrid, Spain
| | - Marta Pérez-Hernández
- Department of Pharmacology, School of Medicine, Instituto de Investigación Sanitaria Gregorio Marañón, Universidad Complutense, Madrid, Spain.,CIBERCV, Madrid, Spain
| | | | - Lorena Ondo
- Department of Pharmacology, School of Medicine, Instituto de Investigación Sanitaria Gregorio Marañón, Universidad Complutense, Madrid, Spain.,CIBERCV, Madrid, Spain
| | - Raquel de Andrés
- Departamento de Biología Molecular and Centro de Biología Molecular "Severo Ochoa" (UAM-CSIC), Universidad Autónoma de Madrid, Madrid, Spain
| | - F Javier Díez-Guerra
- Departamento de Biología Molecular and Centro de Biología Molecular "Severo Ochoa" (UAM-CSIC), Universidad Autónoma de Madrid, Madrid, Spain
| | - Juan Tamargo
- Department of Pharmacology, School of Medicine, Instituto de Investigación Sanitaria Gregorio Marañón, Universidad Complutense, Madrid, Spain.,CIBERCV, Madrid, Spain
| | - Eva Delpón
- Department of Pharmacology, School of Medicine, Instituto de Investigación Sanitaria Gregorio Marañón, Universidad Complutense, Madrid, Spain.,CIBERCV, Madrid, Spain
| | - Ricardo Caballero
- Department of Pharmacology, School of Medicine, Instituto de Investigación Sanitaria Gregorio Marañón, Universidad Complutense, Madrid, Spain.,CIBERCV, Madrid, Spain
| |
Collapse
|
116
|
Alblova M, Smidova A, Docekal V, Vesely J, Herman P, Obsilova V, Obsil T. Molecular basis of the 14-3-3 protein-dependent activation of yeast neutral trehalase Nth1. Proc Natl Acad Sci U S A 2017; 114:E9811-E9820. [PMID: 29087344 PMCID: PMC5699087 DOI: 10.1073/pnas.1714491114] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The 14-3-3 proteins, a family of highly conserved scaffolding proteins ubiquitously expressed in all eukaryotic cells, interact with and regulate the function of several hundreds of partner proteins. Yeast neutral trehalases (Nth), enzymes responsible for the hydrolysis of trehalose to glucose, compared with trehalases from other organisms, possess distinct structure and regulation involving phosphorylation at multiple sites followed by binding to the 14-3-3 protein. Here we report the crystal structures of yeast Nth1 and its complex with Bmh1 (yeast 14-3-3 isoform), which, together with mutational and fluorescence studies, indicate that the binding of Nth1 by 14-3-3 triggers Nth1's activity by enabling the proper 3D configuration of Nth1's catalytic and calcium-binding domains relative to each other, thus stabilizing the flexible part of the active site required for catalysis. The presented structure of the Bmh1:Nth1 complex highlights the ability of 14-3-3 to modulate the structure of a multidomain binding partner and to function as an allosteric effector. Furthermore, comparison of the Bmh1:Nth1 complex structure with those of 14-3-3:serotonin N-acetyltransferase and 14-3-3:heat shock protein beta-6 complexes revealed similarities in the 3D structures of bound partner proteins, suggesting the highly conserved nature of 14-3-3 affects the structures of many client proteins.
Collapse
Affiliation(s)
- Miroslava Alblova
- Department of Structural Biology of Signaling Proteins, Division Biotechnology and Biomedicine Center of the Academy of Sciences and Charles University in Vestec (BIOCEV), Institute of Physiology, The Czech Academy of Sciences, Prague 14220, Czech Republic
| | - Aneta Smidova
- Department of Structural Biology of Signaling Proteins, Division Biotechnology and Biomedicine Center of the Academy of Sciences and Charles University in Vestec (BIOCEV), Institute of Physiology, The Czech Academy of Sciences, Prague 14220, Czech Republic
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Prague 12843, Czech Republic
| | - Vojtech Docekal
- Department of Organic Chemistry, Faculty of Science, Charles University, Prague 12843, Czech Republic
| | - Jan Vesely
- Department of Organic Chemistry, Faculty of Science, Charles University, Prague 12843, Czech Republic
| | - Petr Herman
- Institute of Physics, Faculty of Mathematics and Physics, Charles University, Prague 12116, Czech Republic
| | - Veronika Obsilova
- Department of Structural Biology of Signaling Proteins, Division Biotechnology and Biomedicine Center of the Academy of Sciences and Charles University in Vestec (BIOCEV), Institute of Physiology, The Czech Academy of Sciences, Prague 14220, Czech Republic;
| | - Tomas Obsil
- Department of Structural Biology of Signaling Proteins, Division Biotechnology and Biomedicine Center of the Academy of Sciences and Charles University in Vestec (BIOCEV), Institute of Physiology, The Czech Academy of Sciences, Prague 14220, Czech Republic;
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Prague 12843, Czech Republic
| |
Collapse
|
117
|
Sandí MJ, Marshall CB, Balan M, Coyaud É, Zhou M, Monson DM, Ishiyama N, Chandrakumar AA, La Rose J, Couzens AL, Gingras AC, Raught B, Xu W, Ikura M, Morrison DK, Rottapel R. MARK3-mediated phosphorylation of ARHGEF2 couples microtubules to the actin cytoskeleton to establish cell polarity. Sci Signal 2017; 10:10/503/eaan3286. [PMID: 29089450 DOI: 10.1126/scisignal.aan3286] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The PAR-1-MARK pathway controls cell polarity through the phosphorylation of microtubule-associated proteins. Rho-Rac guanine nucleotide exchange factor 2 (ARHGEF2), which activates Ras homolog family member A (RHOA), is anchored to the microtubule network and sequestered in an inhibited state through binding to dynein light chain Tctex-1 type 1 (DYNLT1). We showed in mammalian cells that liver kinase B1 (LKB1) activated the microtubule affinity-regulating kinase 3 (MARK3), which in turn phosphorylated ARHGEF2 at Ser151 This modification disrupted the interaction between ARHGEF2 and DYNLT1 by generating a 14-3-3 binding site in ARHGEF2, thus causing ARHGEF2 to dissociate from microtubules. Phosphorylation of ARHGEF2 by MARK3 stimulated RHOA activation and the formation of stress fibers and focal adhesions, and was required for organized cellular architecture in three-dimensional culture. Protein phosphatase 2A (PP2A) dephosphorylated Ser151 in ARHGEF2 to restore the inhibited state. Thus, we have identified a regulatory switch controlled by MARK3 that couples microtubules to the actin cytoskeleton to establish epithelial cell polarity through ARHGEF2.
Collapse
Affiliation(s)
- María-José Sandí
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada
| | - Christopher B Marshall
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada
| | - Marc Balan
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada.,Department of Medical Biophysics, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - Étienne Coyaud
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada
| | - Ming Zhou
- Center for Cancer Research, National Cancer Institute at Frederick, P.O. Box B, Frederick, MD 21702, USA
| | - Daniel M Monson
- Center for Cancer Research, National Cancer Institute at Frederick, P.O. Box B, Frederick, MD 21702, USA
| | - Noboru Ishiyama
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada
| | - Arun A Chandrakumar
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada.,Department of Medical Biophysics, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - José La Rose
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada
| | - Amber L Couzens
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario M5G 1X5, Canada
| | - Anne-Claude Gingras
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario M5G 1X5, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Brian Raught
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada.,Department of Medical Biophysics, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - Wei Xu
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada.,Department of Biostatistics, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - Mitsuhiko Ikura
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada.,Department of Medical Biophysics, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - Deborah K Morrison
- Center for Cancer Research, National Cancer Institute at Frederick, P.O. Box B, Frederick, MD 21702, USA
| | - Robert Rottapel
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada. .,Department of Medical Biophysics, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada.,Department of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada.,Department of Immunology, University of Toronto, Toronto, Ontario M5S 1A8, Canada.,Division of Rheumatology, St. Michael's Hospital, 30 Bond Street, Toronto, Ontario M5B 1W8, Canada
| |
Collapse
|
118
|
Structural aspects of protein kinase ASK1 regulation. Adv Biol Regul 2017; 66:31-36. [PMID: 29066278 DOI: 10.1016/j.jbior.2017.10.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 10/13/2017] [Accepted: 10/13/2017] [Indexed: 11/21/2022]
Abstract
Apoptosis signal-regulating kinase 1 (ASK1, also known as MAP3K5), a member of the mitogen-activated protein kinase kinase kinase (MAP3K) family, activates the p38 mitogen-activated protein kinase and the c-Jun N-terminal kinase (JNK) signaling cascades in response to various stressors. ASK1 activity is tightly regulated through phosphorylation and interaction with various binding partners. However, the mechanistic details underlying the ASK1 regulation are still not fully understood. This review focuses on recent advances in structural studies of protein kinase ASK1 and on the insights they provide into its mechanism of regulation. In addition, we also discuss protein-protein interactions between ASK1 and its binding partners thioredoxin (TRX) and 14-3-3 protein.
Collapse
|
119
|
Cornell B, Toyo-Oka K. 14-3-3 Proteins in Brain Development: Neurogenesis, Neuronal Migration and Neuromorphogenesis. Front Mol Neurosci 2017; 10:318. [PMID: 29075177 PMCID: PMC5643407 DOI: 10.3389/fnmol.2017.00318] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 09/19/2017] [Indexed: 11/13/2022] Open
Abstract
The 14-3-3 proteins are a family of highly conserved, multifunctional proteins that are highly expressed in the brain during development. Cumulatively, the seven 14-3-3 isoforms make up approximately 1% of total soluble brain protein. Over the last decade, evidence has accumulated implicating the importance of the 14-3-3 protein family in the development of the nervous system, in particular cortical development, and have more recently been recognized as key regulators in a number of neurodevelopmental processes. In this review we will discuss the known roles of each 14-3-3 isoform in the development of the cortex, their relation to human neurodevelopmental disorders, as well as the challenges and questions that are left to be answered. In particular, we focus on the 14-3-3 isoforms and their involvement in the three key stages of cortical development; neurogenesis and differentiation, neuronal migration and neuromorphogenesis and synaptogenesis.
Collapse
Affiliation(s)
- Brett Cornell
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA, United States
| | - Kazuhito Toyo-Oka
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA, United States
| |
Collapse
|
120
|
Two chaperones locked in an embrace: structure and function of the ribosome-associated complex RAC. Nat Struct Mol Biol 2017; 24:611-619. [PMID: 28771464 DOI: 10.1038/nsmb.3435] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 06/14/2017] [Indexed: 12/26/2022]
Abstract
Chaperones, which assist protein folding are essential components of every living cell. The yeast ribosome-associated complex (RAC) is a chaperone that is highly conserved in eukaryotic cells. The RAC consists of the J protein Zuo1 and the unconventional Hsp70 homolog Ssz1. The RAC heterodimer stimulates the ATPase activity of the ribosome-bound Hsp70 homolog Ssb, which interacts with nascent polypeptide chains to facilitate de novo protein folding. In addition, the RAC-Ssb system is required to maintain the fidelity of protein translation. Recent work reveals important details of the unique structures of RAC and Ssb and identifies how the chaperones interact with the ribosome. The new findings start to uncover how the exceptional chaperone triad cooperates in protein folding and maintenance of translational fidelity and its connection to extraribosomal functions.
Collapse
|
121
|
Trujillo-Ocampo A, Cázares-Raga FE, del Angel RM, Medina-Ramírez F, Santos-Argumedo L, Rodríguez MH, Hernández-Hernández FDLC. Participation of 14-3-3ε and 14-3-3ζ proteins in the phagocytosis, component of cellular immune response, in Aedes mosquito cell lines. Parasit Vectors 2017; 10:362. [PMID: 28764795 PMCID: PMC5540338 DOI: 10.1186/s13071-017-2267-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 07/03/2017] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND Better knowledge of the innate immune system of insects will improve our understanding of mosquitoes as potential vectors of diverse pathogens. The ubiquitously expressed 14-3-3 protein family is evolutionarily conserved from yeast to mammals, and at least two isoforms of 14-3-3, the ε and ζ, have been identified in insects. These proteins have been shown to participate in both humoral and cellular immune responses in Drosophila. As mosquitoes of the genus Aedes are the primary vectors for arboviruses, causing several diseases such as dengue fever, yellow fever, Zika and chikungunya fevers, cell lines derived from these mosquitoes, Aag-2 from Aedes aegypti and C6/36 HT from Aedes albopictus, are currently used to study the insect immune system. Here, we investigated the role of 14-3-3 proteins (ε and ζ isoform) in phagocytosis, the main cellular immune responses executed by the insects, using Aedes spp. cell lines. RESULTS We evaluated the mRNA and protein expression of 14-3-3ε and 14-3-3ζ in C6/36 HT and Aag-2 cells, and demonstrated that both proteins were localised in the cytoplasm. Further, in C6/36 HT cells treated with a 14-3-3 specific inhibitor we observed a notable modification of cell morphology with filopodia-like structure caused through cytoskeleton reorganisation (co-localization of 14-3-3 proteins with F-actin), more importantly the decrease in Salmonella typhimurium, Staphylococcus aureus and E. coli phagocytosis and reduction in phagolysosome formation. Additionally, silencing of 14-3-3ε and 14-3-3ζ expression by mean of specific DsiRNA confirmed the decreased phagocytosis and phagolysosome formation of pHrodo labelled E. coli and S. aureus bacteria by Aag-2 cells. CONCLUSION The 14-3-3ε and 14-3-3ζ proteins modulate cytoskeletal remodelling, and are essential for phagocytosis of Gram-positive and Gram-negative bacteria in Aedes spp. cell lines.
Collapse
Affiliation(s)
- Abel Trujillo-Ocampo
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| | - Febe Elena Cázares-Raga
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| | - Rosa María del Angel
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| | - Fernando Medina-Ramírez
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| | - Leopoldo Santos-Argumedo
- Departamento de Biomedicina Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| | - Mario H. Rodríguez
- Centro de Investigación Sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos Mexico
| | - Fidel de la Cruz Hernández-Hernández
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| |
Collapse
|
122
|
Li X, Hasegawa Y, Lu Y, Sato T. Ubiquitin related enzymes and plant-specific ubiquitin ligase ATL family in tomato plants. PLANT BIOTECHNOLOGY (TOKYO, JAPAN) 2017; 34:71-78. [PMID: 31275011 PMCID: PMC6543760 DOI: 10.5511/plantbiotechnology.17.0306a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 03/06/2017] [Indexed: 05/28/2023]
Abstract
Ubiquitination is one of the fundamental post-translational modifications of proteins with ubiquitin, a conserved 76-amino acid protein present in eukaryotes, which is catalyzed by ubiquitin ligase. Compared with humans, the number of ubiquitin ligase genes is nearly double in plant species such as Arabidopsis and rice, suggesting that this enzyme plays critical roles in many aspects of plant growth, including development and abiotic and biotic environmental stress responses. In addition to its fundamental activities in eukaryotic cells, ubiquitin signaling mediates plant specific cellular functions, including phytohormone response, seed and fruit development, and biotic and abiotic stress responses. The ATL family is a RING-H2 type ubiquitin ligase widely conserved in plant species. We previously showed that the plant specific ubiquitin ligase ATL31 regulates the carbon/nitrogen-nutrient response and pathogen resistance in Arabidopsis, and we identified and characterized the basic biochemical function of an ATL31 homologue in tomato plants (Solanum lycopersicum L.). This protein, called SlATL31, may act as a ubiquitin ligase in tomato fruit. The tomato is a major crop plant and a model system for fleshy fruit development. This review provides an overview of the ubiquitin ligases and related enzymes, and highlights the ubiquitin ligase ATL family in tomato plants.
Collapse
Affiliation(s)
- Xingwen Li
- Faculty of Science and Graduate School of Life Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan
| | - Yoko Hasegawa
- Faculty of Science and Graduate School of Life Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan
| | - Yu Lu
- Faculty of Science and Graduate School of Life Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan
| | - Takeo Sato
- Faculty of Science and Graduate School of Life Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan
| |
Collapse
|
123
|
Kacirova M, Novacek J, Man P, Obsilova V, Obsil T. Structural Basis for the 14-3-3 Protein-Dependent Inhibition of Phosducin Function. Biophys J 2017; 112:1339-1349. [PMID: 28402877 DOI: 10.1016/j.bpj.2017.02.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 02/21/2017] [Accepted: 02/28/2017] [Indexed: 01/06/2023] Open
Abstract
Phosducin (Pdc) is a conserved phosphoprotein that, when unphosphorylated, binds with high affinity to the complex of βγ-subunits of G protein transducin (Gtβγ). The ability of Pdc to bind to Gtβγ is inhibited through its phosphorylation at S54 and S73 within the N-terminal domain (Pdc-ND) followed by association with the scaffolding protein 14-3-3. However, the molecular basis for the 14-3-3-dependent inhibition of Pdc binding to Gtβγ is unclear. By using small-angle x-ray scattering, high-resolution NMR spectroscopy, and limited proteolysis coupled with mass spectrometry, we show that phosphorylated Pdc and 14-3-3 form a complex in which the Pdc-ND region 45-80, which forms a part of Pdc's Gtβγ binding surface and contains both phosphorylation sites, is restrained within the central channel of the 14-3-3 dimer, with both 14-3-3 binding motifs simultaneously participating in protein association. The N-terminal part of Pdc-ND is likely located outside the central channel of the 14-3-3 dimer, but Pdc residues 20-30, which are also involved in Gtβγ binding, are positioned close to the surface of the 14-3-3 dimer. The C-terminal domain of Pdc is located outside the central channel and its structure is unaffected by the complex formation. These results indicate that the 14-3-3 protein-mediated inhibition of Pdc binding to Gtβγ is based on steric occlusion of Pdc's Gtβγ binding surface.
Collapse
Affiliation(s)
- Miroslava Kacirova
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Prague, Czech Republic; Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic
| | - Jiri Novacek
- CEITEC, Masaryk University, Brno, Czech Republic
| | - Petr Man
- BioCeV-Institute of Microbiology, Czech Academy of Sciences, Vestec, Czech Republic; Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
| | - Veronika Obsilova
- Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic.
| | - Tomas Obsil
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Prague, Czech Republic; Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic.
| |
Collapse
|
124
|
Molecular insight into specific 14-3-3 modulators: Inhibitors and stabilisers of protein-protein interactions of 14-3-3. Eur J Med Chem 2017; 136:573-584. [PMID: 28549334 DOI: 10.1016/j.ejmech.2017.04.058] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 04/18/2017] [Accepted: 04/21/2017] [Indexed: 12/17/2022]
Abstract
The 14-3-3 protein family is implicated in several diseases and biological processes. Several recent reviews have summarised knowledge on certain aspects of 14-3-3 proteins, ranging from a historic overview to the structure, function and regulation. This review focuses on the structures and molecular recognition of the modulators by the 14-3-3 proteins, and small modifications of certain modulators are proposed where cocrystal structures have been reported. Our analysis opens up possibilities for the optimisation of the reported compounds. It is very timely to analyse the current status of recently developed modulators given that the field has seen a lot of activity in recent years. This review provides an overview combined with a critical analysis of each class of modulators, keeping their suitability for future development in mind.
Collapse
|
125
|
Cheal Yoo J, Park N, Lee B, Nashed A, Lee YS, Hwan Kim T, Yong Lee D, Kim A, Mi Hwang E, Yi GS, Park JY. 14-3-3γ regulates Copine1-mediated neuronal differentiation in HiB5 hippocampal progenitor cells. Exp Cell Res 2017; 356:85-92. [PMID: 28412242 DOI: 10.1016/j.yexcr.2017.04.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 04/07/2017] [Accepted: 04/09/2017] [Indexed: 12/21/2022]
Abstract
Copine1 (CPNE1), known as a calcium-dependent membrane-binding protein, has tandem C2 domains and an A domain. We previously demonstrated that CPNE1 directly induces neuronal differentiation via Protein kinase B (AKT) phosphorylation in the hippocampal progenitor cell line, HiB5. To better understand its cellular function, we carried out a yeast two-hybrid screening to find CPNE1 binding partners. Among the identified proteins, 14-3-3γ appears to directly interact with CPNE1. Between CPNE1 and 14-3-3γ, the physical interaction as well as the specific binding regions of CPNE1 was confirmed in vitro and in vivo. Furthermore, among the seven 14-3-3 isotypes, only 14-3-3γ directly interacts with CPNE1. Our results also demonstrate that AKT phosphorylation, neurite outgrowth and expression of the neuronal marker protein are increased when 14-3-3γ is overexpressed in CPNE1 high expressed HiB5 cells. Furthermore, the neighboring Ser54 amino acids residue of C2A domain in CPNE1 has an important role in binding with 14-3-3γ, and in differentiation-related function of CPNE1. Moreover, mutation of Ser54 amino acids residue in CPNE1 effectively decreased association with 14-3-3γ and neuronal differentiation of HiB5 cells. Collectively, our findings indicate that 14-3-3γ regulates the differentiation ability of CPNE1 through the binding with C2A domain of CPNE1 in HiB5 cells.
Collapse
Affiliation(s)
- Jae Cheal Yoo
- School of Biosystem and Biomedical Science, College of Health Science, Korea University, Seoul 02841, Republic of Korea; Department of Bio and Brain Engineering, KAIST, Daejeon 305-701, Republic of Korea
| | - Nammi Park
- Department of Physiology, College of Medicine, Inje University, Busan 47392, Republic of Korea
| | - Boah Lee
- Department of Bio and Brain Engineering, KAIST, Daejeon 305-701, Republic of Korea
| | - Abdullateef Nashed
- Department of Bio and Brain Engineering, KAIST, Daejeon 305-701, Republic of Korea
| | - Young-Sun Lee
- School of Biosystem and Biomedical Science, College of Health Science, Korea University, Seoul 02841, Republic of Korea
| | - Tae Hwan Kim
- Rare Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - Da Yong Lee
- Rare Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - Ajung Kim
- KHU-KIST Department of Converging Science and Technology, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Eun Mi Hwang
- KHU-KIST Department of Converging Science and Technology, Kyung Hee University, Seoul 02447, Republic of Korea; Center for Functional Connectomics, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Gwan-Su Yi
- Department of Bio and Brain Engineering, KAIST, Daejeon 305-701, Republic of Korea.
| | - Jae-Yong Park
- School of Biosystem and Biomedical Science, College of Health Science, Korea University, Seoul 02841, Republic of Korea.
| |
Collapse
|
126
|
Lu Y, Ding S, Zhou R, Wu J. Structure of the complex of phosphorylated liver kinase B1 and 14-3-3ζ. Acta Crystallogr F Struct Biol Commun 2017; 73:196-201. [PMID: 28368277 PMCID: PMC5379168 DOI: 10.1107/s2053230x17003521] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Accepted: 03/04/2017] [Indexed: 12/12/2022] Open
Abstract
The serine/threonine protein kinase liver kinase B1 (LKB1) is a tumour suppressor and plays important roles in development and metabolism. It phosphorylates AMPK and AMPK-related kinases to regulate multiple physiological processes. Mutations in LKB1 often occur in multiple cancers. LKB1 can be suppressed by 14-3-3 proteins in a phosphorylation-dependent manner. Previously, the structure of a 14-3-3ζ-LKB1 fusion protein has been reported, revealing a phosphorylation-independent binding mode of LKB1 to 14-3-3 proteins. Here, the crystal structure of phosphorylated LKB1 peptide in complex with 14-3-3ζ was solved, which provides a structural basis for the phosphorylation-dependent recognition of LKB1 by 14-3-3 proteins.
Collapse
Affiliation(s)
- Yongjian Lu
- Department of Stomatology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, People’s Republic of China
| | - Sheng Ding
- Department of Stomatology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, People’s Republic of China
| | - Ruiqing Zhou
- Department of Stomatology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, People’s Republic of China
| | - Jianyong Wu
- Department of Stomatology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, People’s Republic of China
| |
Collapse
|
127
|
den Hamer A, Lemmens LJM, Nijenhuis MAD, Ottmann C, Merkx M, de Greef TFA, Brunsveld L. Small-Molecule-Induced and Cooperative Enzyme Assembly on a 14-3-3 Scaffold. Chembiochem 2017; 18:331-335. [PMID: 27897387 PMCID: PMC5299510 DOI: 10.1002/cbic.201600631] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Indexed: 12/23/2022]
Abstract
Scaffold proteins regulate cell signalling by promoting the proximity of putative interaction partners. Although they are frequently applied in cellular settings, fundamental understanding of them in terms of, amongst other factors, quantitative parameters has been lagging behind. Here we present a scaffold protein platform that is based on the native 14-3-3 dimeric protein and is controllable through the action of a small-molecule compound, thus permitting study in an in vitro setting and mathematical description. Robust small-molecule regulation of caspase-9 activity through induced dimerisation on the 14-3-3 scaffold was demonstrated. The individual parameters of this system were precisely determined and used to develop a mathematical model of the scaffolding concept. This model was used to elucidate the strong cooperativity of the enzyme activation mediated by the 14-3-3 scaffold. This work provides an entry point for the long-needed quantitative insights into scaffold protein functioning and paves the way for the optimal use of reengineered 14-3-3 proteins as chemically inducible scaffolds in synthetic systems.
Collapse
Affiliation(s)
- Anniek den Hamer
- Laboratory of Chemical BiologyDepartment of Biomedical Engineering andInstitute of Complex Molecular SystemsEindhoven University of TechnologyDen Dolech 25612AZ EindhovenNetherlands
| | - Lenne J. M. Lemmens
- Laboratory of Chemical BiologyDepartment of Biomedical Engineering andInstitute of Complex Molecular SystemsEindhoven University of TechnologyDen Dolech 25612AZ EindhovenNetherlands
| | - Minke A. D. Nijenhuis
- Laboratory of Chemical BiologyDepartment of Biomedical Engineering andInstitute of Complex Molecular SystemsEindhoven University of TechnologyDen Dolech 25612AZ EindhovenNetherlands
| | - Christian Ottmann
- Laboratory of Chemical BiologyDepartment of Biomedical Engineering andInstitute of Complex Molecular SystemsEindhoven University of TechnologyDen Dolech 25612AZ EindhovenNetherlands
| | - Maarten Merkx
- Laboratory of Chemical BiologyDepartment of Biomedical Engineering andInstitute of Complex Molecular SystemsEindhoven University of TechnologyDen Dolech 25612AZ EindhovenNetherlands
| | - Tom F. A. de Greef
- Laboratory of Chemical BiologyDepartment of Biomedical Engineering andInstitute of Complex Molecular SystemsEindhoven University of TechnologyDen Dolech 25612AZ EindhovenNetherlands
| | - Luc Brunsveld
- Laboratory of Chemical BiologyDepartment of Biomedical Engineering andInstitute of Complex Molecular SystemsEindhoven University of TechnologyDen Dolech 25612AZ EindhovenNetherlands
| |
Collapse
|
128
|
Proteomics Screen Identifies Class I Rab11 Family Interacting Proteins as Key Regulators of Cytokinesis. Mol Cell Biol 2017; 37:MCB.00278-16. [PMID: 27872148 DOI: 10.1128/mcb.00278-16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 11/11/2016] [Indexed: 01/08/2023] Open
Abstract
The 14-3-3 protein family orchestrates a complex network of molecular interactions that regulates various biological processes. Owing to their role in regulating the cell cycle and protein trafficking, 14-3-3 proteins are prevalent in human diseases such as cancer, diabetes, and neurodegeneration. 14-3-3 proteins are expressed in all eukaryotic cells, suggesting that they mediate their biological functions through evolutionarily conserved protein interactions. To identify these core 14-3-3 client proteins, we used an affinity-based proteomics approach to characterize and compare the human and Drosophila 14-3-3 interactomes. Using this approach, we identified a group of Rab11 effector proteins, termed class I Rab11 family interacting proteins (Rab11-FIPs), or Rip11 in Drosophila We found that 14-3-3 binds to Rip11 in a phospho-dependent manner to ensure its proper subcellular distribution during cell division. Our results indicate that Rip11 plays an essential role in the regulation of cytokinesis and that this function requires its association with 14-3-3 but not with Rab11. Together, our results suggest an evolutionarily conserved role for 14-3-3 in controlling Rip11-dependent protein transport during cytokinesis.
Collapse
|
129
|
He Y, Zhang Y, Chen L, Wu C, Luo Q, Zhang F, Wei Q, Li K, Chang J, Yang G, He G. A Member of the 14-3-3 Gene Family in Brachypodium distachyon, BdGF14d, Confers Salt Tolerance in Transgenic Tobacco Plants. FRONTIERS IN PLANT SCIENCE 2017; 8:340. [PMID: 28348575 PMCID: PMC5346558 DOI: 10.3389/fpls.2017.00340] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 02/27/2017] [Indexed: 05/08/2023]
Abstract
Plant 14-3-3 proteins are involved in diverse biological processes, but for the model monocotyledonous species, Brachypodium distachyon, their roles in abiotic stress tolerance are not well understood. In this study, a total of eight Bd14-3-3 genes were identified from B. distachyon and these were designated respectively as BdGF14a-BdGF14g. The qRT-PCR analyses of 3-month-old plants of B. distachyon showed that these genes were all expressed in the stems, leaves, and spikelets. By contrast, most of the plants had relatively lower transcriptional levels in their roots, except for the BdGF14g gene. The different expression profiles of the Bd14-3-3s under various stress treatments, and the diverse interaction patterns between Bd14-3-3s and BdAREB/ABFs, suggested that these gene products probably had a range of functions in the stress responses. The NaCl-induced Bd14-3-3 gene, BdGF14d, was selected for overexpression in tobacco. BdGF14d was found to be localized throughout the cell and it conferred enhanced tolerance to salt in the transgenic plants. Lowered contents of malondialdehyde, H2O2, and Na+, and lower relative electronic conductance (Rec%), yet greater activities of catalase and peroxidase, were observed in the overexpressing plants. Higher photosynthetic rate, transpiration rate, stomatal conductance, and water use efficiency were measured in the transgenic lines. Following abscisic acid (ABA) or NaCl treatment, stomatal aperture in leaves of the BdGF14d-overexpression plants was significantly lower than in leaves of the wild type (WT) controls. The stress-related marker genes involved in the ABA signaling pathway, the reactive oxygen species (ROS)-scavenging system, and the ion transporters were all up-regulated in the BdGF14d-overexpressing plants as compared with WT. Taken together, these results demonstrate that the Bd14-3-3 genes play important roles in abiotic stress tolerance. The ABA signaling pathway, the ROS-scavenging system, and ion transporters were all involved in enhancing the tolerance to salt stress in the BdGF14d-overexpression plants.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | - Junli Chang
- *Correspondence: Junli Chang, Guangxiao Yang, Guangyuan He,
| | - Guangxiao Yang
- *Correspondence: Junli Chang, Guangxiao Yang, Guangyuan He,
| | - Guangyuan He
- *Correspondence: Junli Chang, Guangxiao Yang, Guangyuan He,
| |
Collapse
|
130
|
Waløen K, Kleppe R, Martinez A, Haavik J. Tyrosine and tryptophan hydroxylases as therapeutic targets in human disease. Expert Opin Ther Targets 2016; 21:167-180. [PMID: 27973928 DOI: 10.1080/14728222.2017.1272581] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
INTRODUCTION The ancient and ubiquitous monoamine signalling molecules serotonin, dopamine, norepinephrine, and epinephrine are involved in multiple physiological functions. The aromatic amino acid hydroxylases tyrosine hydroxylase (TH), tryptophan hydroxylase 1 (TPH1), and tryptophan hydroxylase 2 (TPH2) catalyse the rate-limiting steps in the biosynthesis of these monoamines. Genetic variants of TH, TPH1, and TPH2 genes are associated with neuropsychiatric disorders. The interest in these enzymes as therapeutic targets is increasing as new roles of these monoamines have been discovered, not only in brain function and disease, but also in development, cardiovascular function, energy and bone homeostasis, gastrointestinal motility, hemostasis, and liver function. Areas covered: Physiological roles of TH, TPH1, and TPH2. Enzyme structures, catalytic and regulatory mechanisms, animal models, and associated diseases. Interactions with inhibitors, pharmacological chaperones, and regulatory proteins relevant for drug development. Expert opinion: Established inhibitors of these enzymes mainly target their amino acid substrate binding site, while tetrahydrobiopterin analogues, iron chelators, and allosteric ligands are less studied. New insights into monoamine biology and 3D-structural information and new computational/experimental tools have triggered the development of a new generation of more selective inhibitors and pharmacological chaperones. The enzyme complexes with their regulatory 14-3-3 proteins are also emerging as therapeutic targets.
Collapse
Affiliation(s)
- Kai Waløen
- a Department of Biomedicine and K.G. Jebsen Centre for Neuropsychiatric Disorders , University of Bergen , Bergen , Norway
| | - Rune Kleppe
- b Computational Biology Unit, Department of Informatics , University of Bergen , Bergen , Norway
| | - Aurora Martinez
- a Department of Biomedicine and K.G. Jebsen Centre for Neuropsychiatric Disorders , University of Bergen , Bergen , Norway
| | - Jan Haavik
- a Department of Biomedicine and K.G. Jebsen Centre for Neuropsychiatric Disorders , University of Bergen , Bergen , Norway
| |
Collapse
|
131
|
Trujillo-Ocampo A, Cázares-Raga FE, Celestino-Montes A, Cortés-Martínez L, Rodríguez MH, Hernández-Hernández FDLC. IDENTIFICATION AND EXPRESSION ANALYSIS OF TWO 14-3-3 PROTEINS IN THE MOSQUITO Aedes aegypti, AN IMPORTANT ARBOVIRUSES VECTOR. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2016; 93:143-159. [PMID: 27592842 DOI: 10.1002/arch.21348] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The 14-3-3 proteins are evolutionarily conserved acidic proteins that form a family with several isoforms in many cell types of plants and animals. In invertebrates, including dipteran and lepidopteran insects, only two isoforms have been reported. 14-3-3 proteins are scaffold molecules that form homo- or heterodimeric complexes, acting as molecular adaptors mediating phosphorylation-dependent interactions with signaling molecules involved in immunity, cell differentiation, cell cycle, proliferation, apoptosis, and cancer. Here, we describe the presence of two isoforms of 14-3-3 in the mosquito Aedes aegypti, the main vector of dengue, yellow fever, chikungunya, and zika viruses. Both isoforms have the conserved characteristics of the family: two protein signatures (PS1 and PS2), an annexin domain, three serine residues, targets for phosphorylation (positions 58, 184, and 233), necessary for their function, and nine alpha helix-forming segments. By sequence alignment and phylogenetic analysis, we found that the molecules correspond to Ɛ and ζ isoforms (Aeae14-3-3ε and Aeae14-3-3ζ). The messengers and protein products were present in all stages of the mosquito life cycle and all the tissues analyzed, with a small predominance of Aeae14-3-3ζ except in the midgut and ovaries of adult females. The 14-3-3 proteins in female midgut epithelial cells were located in the cytoplasm. Our results may provide insights to further investigate the functions of these proteins in mosquitoes.
Collapse
Affiliation(s)
- Abel Trujillo-Ocampo
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México
| | - Febe Elena Cázares-Raga
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México
| | - Antonio Celestino-Montes
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México
| | - Leticia Cortés-Martínez
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México
| | - Mario H Rodríguez
- Centro de Investigación Sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México
| | - Fidel de la Cruz Hernández-Hernández
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México.
| |
Collapse
|
132
|
Eisenreichova A, Klima M, Boura E. Crystal structures of a yeast 14-3-3 protein from Lachancea thermotolerans in the unliganded form and bound to a human lipid kinase PI4KB-derived peptide reveal high evolutionary conservation. Acta Crystallogr F Struct Biol Commun 2016; 72:799-803. [PMID: 27827352 PMCID: PMC5101580 DOI: 10.1107/s2053230x16015053] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 09/22/2016] [Indexed: 01/02/2023] Open
Abstract
14-3-3 proteins bind phosphorylated binding partners to regulate several of their properties, including enzymatic activity, stability and subcellular localization. Here, two crystal structures are presented: the crystal structures of the 14-3-3 protein (also known as Bmh1) from the yeast Lachancea thermotolerans in the unliganded form and bound to a phosphopeptide derived from human PI4KB (phosphatidylinositol 4-kinase B). The structures demonstrate the high evolutionary conservation of ligand recognition by 14-3-3 proteins. The structural analysis suggests that ligand recognition by 14-3-3 proteins evolved very early in the evolution of eukaryotes and remained conserved, underlying the importance of 14-3-3 proteins in physiology.
Collapse
Affiliation(s)
- Andrea Eisenreichova
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
| | - Martin Klima
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
| | - Evzen Boura
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
| |
Collapse
|
133
|
Nagai T, Yoshimoto J, Kannon T, Kuroda K, Kaibuchi K. Phosphorylation Signals in Striatal Medium Spiny Neurons. Trends Pharmacol Sci 2016; 37:858-871. [DOI: 10.1016/j.tips.2016.07.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 07/18/2016] [Accepted: 07/21/2016] [Indexed: 12/21/2022]
|
134
|
Site-specific phosphorylation and microtubule dynamics control Pyrin inflammasome activation. Proc Natl Acad Sci U S A 2016; 113:E4857-66. [PMID: 27482109 DOI: 10.1073/pnas.1601700113] [Citation(s) in RCA: 161] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Pyrin, encoded by the MEFV gene, is best known for its gain-of-function mutations causing familial Mediterranean fever (FMF), an autoinflammatory disease. Pyrin forms a caspase-1-activating inflammasome in response to inactivating modifications of Rho GTPases by various bacterial toxins or effectors. Pyrin-mediated innate immunity is unique in that it senses bacterial virulence rather than microbial molecules, but its mechanism of activation is unknown. Here we show that Pyrin was phosphorylated in bone marrow-derived macrophages and dendritic cells. We identified Ser-205 and Ser-241 in mouse Pyrin whose phosphorylation resulted in inhibitory binding by cellular 14-3-3 proteins. The two serines underwent dephosphorylation upon toxin stimulation or bacterial infection, triggering 14-3-3 dissociation, which correlated with Pyrin inflammasome activation. We developed antibodies specific for phosphorylated Ser-205 and Ser-241, which confirmed the stimuli-induced dephosphorylation of endogenous Pyrin. Mutational analyses indicated that both phosphorylation and signal-induced dephosphorylation of Ser-205/241 are important for Pyrin activation. Moreover, microtubule drugs, including colchicine, commonly used to treat FMF, effectively blocked activation of the Pyrin inflammasome. These drugs did not affect Pyrin dephosphorylation and 14-3-3 dissociation but inhibited Pyrin-mediated apoptosis-associated Speck-like protein containing CARD (ASC) aggregation. Our study reveals that site-specific (de)phosphorylation and microtubule dynamics critically control Pyrin inflammasome activation, illustrating a fine and complex mechanism in cytosolic immunity.
Collapse
|
135
|
Wadas B, Borjigin J, Huang Z, Oh JH, Hwang CS, Varshavsky A. Degradation of Serotonin N-Acetyltransferase, a Circadian Regulator, by the N-end Rule Pathway. J Biol Chem 2016; 291:17178-96. [PMID: 27339900 DOI: 10.1074/jbc.m116.734640] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Indexed: 12/22/2022] Open
Abstract
Serotonin N-acetyltransferase (AANAT) converts serotonin to N-acetylserotonin (NAS), a distinct biological regulator and the immediate precursor of melatonin, a circulating hormone that influences circadian processes, including sleep. N-terminal sequences of AANAT enzymes vary among vertebrates. Mechanisms that regulate the levels of AANAT are incompletely understood. Previous findings were consistent with the possibility that AANAT may be controlled through its degradation by the N-end rule pathway. By expressing the rat and human AANATs and their mutants not only in mammalian cells but also in the yeast Saccharomyces cerevisiae, and by taking advantage of yeast genetics, we show here that two "complementary" forms of rat AANAT are targeted for degradation by two "complementary" branches of the N-end rule pathway. Specifically, the N(α)-terminally acetylated (Nt-acetylated) Ac-AANAT is destroyed through the recognition of its Nt-acetylated N-terminal Met residue by the Ac/N-end rule pathway, whereas the non-Nt-acetylated AANAT is targeted by the Arg/N-end rule pathway, which recognizes the unacetylated N-terminal Met-Leu sequence of rat AANAT. We also show, by constructing lysine-to-arginine mutants of rat AANAT, that its degradation is mediated by polyubiquitylation of its Lys residue(s). Human AANAT, whose N-terminal sequence differs from that of rodent AANATs, is longer-lived than its rat counterpart and appears to be refractory to degradation by the N-end rule pathway. Together, these and related results indicate both a major involvement of the N-end rule pathway in the control of rodent AANATs and substantial differences in the regulation of rodent and human AANATs that stem from differences in their N-terminal sequences.
Collapse
Affiliation(s)
- Brandon Wadas
- From the Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125
| | - Jimo Borjigin
- the Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan 48109
| | - Zheping Huang
- the Department of Immunology, University of Connecticut School of Medicine, Farmington, Connecticut 06030, and
| | - Jang-Hyun Oh
- From the Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125
| | - Cheol-Sang Hwang
- the Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk, 790-784, South Korea
| | - Alexander Varshavsky
- From the Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125,
| |
Collapse
|
136
|
Yang J, Zhu W, Huang J, Wang X, Sun X, Zhan B, Zhu X. Partially protective immunity induced by the 14-3-3 protein from Trichinella spiralis. Vet Parasitol 2016; 231:63-68. [PMID: 27387374 DOI: 10.1016/j.vetpar.2016.06.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 06/12/2016] [Accepted: 06/22/2016] [Indexed: 12/22/2022]
Abstract
Trichinellosis, a widespread zoonosis, is considered to be an emerging or re-emerging infectious parasitic disease. The development of vaccines to prevent Trichinella infection in domestic animals and humans is important for disease control. In a previous study, we identified Ts14-3-3 as an immunodominant protein from Trichinella spiralis (T. spiralis) adult worms recognized by early infection sera from pigs and mice. In this study, we further confirmed that Ts14-3-3 mRNA is expressed in both adult worms and in the larval stages of T. spiralis. Immunostaining with anti-Ts14-3-3 mouse sera further confirmed that native Ts14-3-3 is highly expressed on the surface of T. spiralis muscle larvae. The immune recognition by infected sera, its expression in both adult and larval stages and its exposure on the surface of the parasite led us to explore Ts14-3-3 as a vaccine antigen. Recombinant Ts14-3-3 formulated with an ISA50v2 adjuvant produced strong total IgG and balanced IgG1 and IgG2a responses in vaccinated mice and stimulated mouse splenocytes to produce high levels of Th1 (INF-γ, IL-2) and Th2 (IL4, IL5) cytokines. These results indicate that Ts14-3-3 is highly immunogenic and is able to induce balanced Th1/Th2 immune responses. These vaccine-induced immune responses resulted in a reduction in muscle larvae of up to 46.2% in vaccinated mice upon subsequent larval challenge relative to the number of larvae in mice received PBS control. The significant reduction in muscle larvae in vaccinated mice suggests that Ts14-3-3 is a promising vaccine target for potential use in domestic pigs to prevent trichinellosis transmission.
Collapse
Affiliation(s)
- Jing Yang
- Department of Medical Microbiology & Parasitology, School of Basic Medical Sciences, Capital Medical University, Beijing, China.
| | - Wei Zhu
- Department of Medical Microbiology & Parasitology, School of Basic Medical Sciences, Capital Medical University, Beijing, China.
| | - Jingjing Huang
- Department of Medical Microbiology & Parasitology, School of Basic Medical Sciences, Capital Medical University, Beijing, China.
| | - Xiaohuan Wang
- Department of Medical Microbiology & Parasitology, School of Basic Medical Sciences, Capital Medical University, Beijing, China.
| | - Ximeng Sun
- Department of Medical Microbiology & Parasitology, School of Basic Medical Sciences, Capital Medical University, Beijing, China.
| | - Bin Zhan
- Department of Pediatrics, Section of Tropical Medicine, Baylor College of Medicine, 9 Houston, TX 77030, USA.
| | - Xinping Zhu
- Department of Medical Microbiology & Parasitology, School of Basic Medical Sciences, Capital Medical University, Beijing, China.
| |
Collapse
|
137
|
Liang R, Wang Z, Zhu MN, Hao CX, Zhang N, Wang JH, Zhang T, Yang L, Gu HT, Dong BX, Bai QX, Gao GX, Chen XQ. [Clinical analysis of the character and prognostic factors of 23 cases of mantle cell lymphoma]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2016; 37:491-6. [PMID: 27431074 PMCID: PMC7348349 DOI: 10.3760/cma.j.issn.0253-2727.2016.06.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To investigate the clinical characteristics and prognostic factors of mantle cell lymphoma (MCL) patients. METHODS The clinical data of 23 MCL patients were retrospectively analyzed. Immunohistochemical stain was performed to detect the protein expressions of Mcl-1, pNF-κB p65 and 14-3-3ζ of MCL patients to analyze its prognostic factors. RESULTS Among 23 MCL patients, there were 17(73.9%) patients with IPI 0-2 (low risk group) and 6(26.1%) patients with IPI 3-4. Only the rate of 2y-progression-free survival (PFS) of group IPI 0-2 was superior to that of group IPI 3-4 patients (47.1% vs 0, P=0.049); There were 16 (69.5%) patients with MIPI < 5.7, whose rates of overall response rate (ORR), 2y overall survival (OS) and PFS were better than those of the ones with MIPI ≥ 5.7(ORR: 81.3% vs 33.3% P=0.032; OS: 68.8% vs 16.7% P=0.041; PFS: 50% vs 0, P=0.040 respectively). The rates of ORR, 2y-OS and 2y-PFS (100.0%, 80.0% and 70.0%) of patienets received regimen R+CHOP(E) were all superior to those (38.5%, 30.8% and 7.7%) of ones received regimen CHOP(E) (P=0.002, P= 0.024, P=0.003, respectively). Among 12 patients, 2 out of 6 cases with Mcl-1 positive expression achieved good response (CR+PR) and 2y-OS, 1 case 2y-PFS; All 6 cases with Mcl-1 negative expression achieved good response (CR+PR) and 2y-OS, 5 cases 2y-PFS. 3 out of 6 cases with pNF-κB p65 positive expression achieved good response (CR+PR) and 2y-OS, 1 case 2y-PFS; 5 out of 6 cases with pNF-κB p65 negative expression achieved good response (CR+ PR) and 2y-OS/PFS. 5 out of 8 cases with 14-3-3ζ positive expression achieved good response (CR+PR), 4 cases 2y-OS, and 3 cases 2y-PFS. 3 out of 4 cases with 14-3-3ζ negative expression achieved CR, 4 cases 2y-OS, and 3 cases 2y-PFS. CONCLUSION MCL patients had high heterogeneity. MIPI has better prognostic significance than IPI. R+CHOP(E) as first line treatment improved the rates of OS/PFS. The expressions of Mcl-1, pNF-κB p65 and 14-3-3ζ proteins in MCL might be related to prognosis.
Collapse
Affiliation(s)
- R Liang
- Department of Hematology, Xijing Hosptial, Fourth Military Medical University, Xi'an 710032, China
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
138
|
The yeast Hsp70 homolog Ssb: a chaperone for general de novo protein folding and a nanny for specific intrinsically disordered protein domains. Curr Genet 2016; 63:9-13. [PMID: 27230907 PMCID: PMC5274638 DOI: 10.1007/s00294-016-0610-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 05/06/2016] [Accepted: 05/09/2016] [Indexed: 12/17/2022]
Abstract
Activation of the heterotrimeric kinase SNF1 via phosphorylation of a specific residue within the α subunit is essential for the release from glucose repression in the yeast Saccharomyces cerevisiae. When glucose is available, SNF1 is maintained in the dephosphorylated, inactive state by the phosphatase Glc7-Reg1. Recent findings suggest that Bmh and Ssb combine their unique client-binding properties to interact with the regulatory region of the SNF1 α subunit and by that stabilize a conformation of SNF1, which is accessible for Glc7-Reg1-dependent dephosphorylation. Together, the 14-3-3 protein Bmh and the Hsp70 homolog Ssb comprise a novel chaperone module, which is required to maintain proper glucose repression in the yeast S. cerevisiae.
Collapse
|
139
|
Salas PJ, Forteza R, Mashukova A. Multiple roles for keratin intermediate filaments in the regulation of epithelial barrier function and apico-basal polarity. Tissue Barriers 2016; 4:e1178368. [PMID: 27583190 PMCID: PMC4993576 DOI: 10.1080/21688370.2016.1178368] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 04/05/2016] [Accepted: 04/07/2016] [Indexed: 12/27/2022] Open
Abstract
As multicellular organisms evolved a family of cytoskeletal proteins, the keratins (types I and II) expressed in epithelial cells diversified in more than 20 genes in vertebrates. There is no question that keratin filaments confer mechanical stiffness to cells. However, such a number of genes can hardly be explained by evolutionary advantages in mechanical features. The use of transgenic mouse models has revealed unexpected functional relationships between keratin intermediate filaments and intracellular signaling. Accordingly, loss of keratins or mutations in keratins that cause or predispose to human diseases, result in increased sensitivity to apoptosis, regulation of innate immunity, permeabilization of tight junctions, and mistargeting of apical proteins in different epithelia. Precise mechanistic explanations for these phenomena are still lacking. However, immobilization of membrane or cytoplasmic proteins, including chaperones, on intermediate filaments (“scaffolding”) appear as common molecular mechanisms and may explain the need for so many different keratin genes in vertebrates.
Collapse
Affiliation(s)
- Pedro J Salas
- Department of Cell Biology, Miller School of Medicine, University of Miami , Miami, FL, USA
| | - Radia Forteza
- Department of Cell Biology, Miller School of Medicine, University of Miami , Miami, FL, USA
| | - Anastasia Mashukova
- Department of Cell Biology, Miller School of Medicine, University of Miami, Miami, FL, USA; Department of Physiology, Nova Southeastern University, Fort Lauderdale, FL, USA
| |
Collapse
|
140
|
Characterization of ubiquitin ligase SlATL31 and proteomic analysis of 14-3-3 targets in tomato fruit tissue (Solanum lycopersicum L.). J Proteomics 2016; 143:254-264. [PMID: 27113132 DOI: 10.1016/j.jprot.2016.04.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 04/13/2016] [Accepted: 04/18/2016] [Indexed: 02/01/2023]
Abstract
UNLABELLED The 14-3-3 proteins participate in many aspects of plant physiology by interacting with phosphorylated proteins and thereby regulating target protein functions. In Arabidopsis plant, the ubiquitin ligase ATL31 controls 14-3-3 stability via both direct interaction and ubiquitination, and this consequently regulates post-germinative growth in response to carbon and nitrogen nutrient availability. Since 14-3-3 proteins regulate the activities of many key enzymes related to nutrient metabolism, one would anticipate that they should play an essential role not only in vegetative but also in reproductive tissue. Because fruit yield largely depends on carbon and nitrogen availability and their utilization, the function of 14-3-3 proteins was analyzed in tomato fruit tissue. Here, we isolated and characterized an ubiquitin ligase SlATL31 (Solyc03g112340) from tomato and demonstrated that SlATL31 has ubiquitin ligase activity as well as interaction with tomato 14-3-3 proteins, suggesting the possibility that the SlATL31 functions as an ubiquitin ligase for 14-3-3 similarly to its Arabidopsis ortholog. Furthermore, we performed proteomic analysis of 14-3-3 interacting proteins and identified 106 proteins as putative 14-3-3 targets including key enzymes for carbon metabolism and photosynthesis. This 14-3-3 interactome result and available transcriptome profile suggest a considerable yet complex role of 14-3-3 proteins in tomato fruit tissue. BIOLOGICAL SIGNIFICANCE Considerable cumulative evidence exists which implies that 14-3-3 proteins are involved in the regulation of plant primary metabolism. Here we provide the first report of 14-3-3 interactome analysis and identify putative 14-3-3 targets in tomato fruit tissue, which may be highly important given the documented metabolic shifts, which occur during fruit development and ripening. These data open future research avenues by which to understand the regulation of the role of post-translational regulation in tomato fruit development.
Collapse
|
141
|
Hübscher V, Mudholkar K, Chiabudini M, Fitzke E, Wölfle T, Pfeifer D, Drepper F, Warscheid B, Rospert S. The Hsp70 homolog Ssb and the 14-3-3 protein Bmh1 jointly regulate transcription of glucose repressed genes in Saccharomyces cerevisiae. Nucleic Acids Res 2016; 44:5629-45. [PMID: 27001512 PMCID: PMC4937304 DOI: 10.1093/nar/gkw168] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 03/03/2016] [Indexed: 11/26/2022] Open
Abstract
Chaperones of the Hsp70 family interact with a multitude of newly synthesized polypeptides and prevent their aggregation. Saccharomyces cerevisiae cells lacking the Hsp70 homolog Ssb suffer from pleiotropic defects, among others a defect in glucose-repression. The highly conserved heterotrimeric kinase SNF1/AMPK (AMP-activated protein kinase) is required for the release from glucose-repression in yeast and is a key regulator of energy balance also in mammalian cells. When glucose is available the phosphatase Glc7 keeps SNF1 in its inactive, dephosphorylated state. Dephosphorylation depends on Reg1, which mediates targeting of Glc7 to its substrate SNF1. Here we show that the defect in glucose-repression in the absence of Ssb is due to the ability of the chaperone to bridge between the SNF1 and Glc7 complexes. Ssb performs this post-translational function in concert with the 14-3-3 protein Bmh, to which Ssb binds via its very C-terminus. Raising the intracellular concentration of Ssb or Bmh enabled Glc7 to dephosphorylate SNF1 even in the absence of Reg1. By that Ssb and Bmh efficiently suppressed transcriptional deregulation of Δreg1 cells. The findings reveal that Ssb and Bmh comprise a new chaperone module, which is involved in the fine tuning of a phosphorylation-dependent switch between respiration and fermentation.
Collapse
Affiliation(s)
- Volker Hübscher
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, D-79104 Freiburg, Germany
| | - Kaivalya Mudholkar
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, D-79104 Freiburg, Germany
| | - Marco Chiabudini
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, D-79104 Freiburg, Germany BIOSS Centre for Biological Signaling Studies, University of Freiburg, D-79104 Freiburg, Germany
| | - Edith Fitzke
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, D-79104 Freiburg, Germany
| | - Tina Wölfle
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, D-79104 Freiburg, Germany
| | - Dietmar Pfeifer
- Genomics Lab, Department of Hematology, Oncology and Stem Cell Transplantation, University Medical Center, University of Freiburg, D-79106 Freiburg, Germany
| | - Friedel Drepper
- BIOSS Centre for Biological Signaling Studies, University of Freiburg, D-79104 Freiburg, Germany Department of Biochemistry and Functional Proteomics, Faculty of Biology, University of Freiburg, D-79104 Freiburg, Germany
| | - Bettina Warscheid
- BIOSS Centre for Biological Signaling Studies, University of Freiburg, D-79104 Freiburg, Germany Department of Biochemistry and Functional Proteomics, Faculty of Biology, University of Freiburg, D-79104 Freiburg, Germany
| | - Sabine Rospert
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, D-79104 Freiburg, Germany BIOSS Centre for Biological Signaling Studies, University of Freiburg, D-79104 Freiburg, Germany
| |
Collapse
|
142
|
Wu JC, Espiritu EB, Rose LS. The 14-3-3 protein PAR-5 regulates the asymmetric localization of the LET-99 spindle positioning protein. Dev Biol 2016; 412:288-297. [PMID: 26921457 DOI: 10.1016/j.ydbio.2016.02.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 02/19/2016] [Accepted: 02/23/2016] [Indexed: 01/03/2023]
Abstract
PAR proteins play important roles in establishing cytoplasmic polarity as well as regulating spindle positioning during asymmetric division. However, the molecular mechanisms by which the PAR proteins generate asymmetry in different cell types are still being elucidated. Previous studies in Caenorhabditis elegans revealed that PAR-3 and PAR-1 regulate the asymmetric localization of LET-99, which in turn controls spindle positioning by affecting the distribution of the conserved force generating complex. In wild-type embryos, LET-99 is localized in a lateral cortical band pattern, via inhibition at the anterior by PAR-3 and at the posterior by PAR-1. In this report, we show that the 14-3-3 protein PAR-5 is also required for cortical LET-99 asymmetry. PAR-5 associated with LET-99 in pull-down assays, and two PAR-5 binding sites were identified in LET-99 using the yeast two-hybrid assay. Mutation of these sites abolished binding in yeast and altered LET-99 localization in vivo: LET-99 was present at the highest levels at the posterior pole of the embryo instead of a band in par-5 embryos. Together the results indicate that PAR-5 acts in a mechanism with PAR-1 to regulate LET-99 cortical localization.
Collapse
Affiliation(s)
- Jui-Ching Wu
- Department of Molecular and Cellular Biology, University of California, Davis, USA
| | - Eugenel B Espiritu
- Department of Molecular and Cellular Biology, University of California, Davis, USA
| | - Lesilee S Rose
- Department of Molecular and Cellular Biology, University of California, Davis, USA
| |
Collapse
|
143
|
Nagai T, Nakamuta S, Kuroda K, Nakauchi S, Nishioka T, Takano T, Zhang X, Tsuboi D, Funahashi Y, Nakano T, Yoshimoto J, Kobayashi K, Uchigashima M, Watanabe M, Miura M, Nishi A, Kobayashi K, Yamada K, Amano M, Kaibuchi K. Phosphoproteomics of the Dopamine Pathway Enables Discovery of Rap1 Activation as a Reward Signal In Vivo. Neuron 2016; 89:550-65. [DOI: 10.1016/j.neuron.2015.12.019] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 10/17/2015] [Accepted: 12/10/2015] [Indexed: 12/21/2022]
|
144
|
Fatscher T, Boehm V, Gehring NH. Mechanism, factors, and physiological role of nonsense-mediated mRNA decay. Cell Mol Life Sci 2015; 72:4523-44. [PMID: 26283621 PMCID: PMC11113733 DOI: 10.1007/s00018-015-2017-9] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 07/10/2015] [Accepted: 08/06/2015] [Indexed: 02/04/2023]
Abstract
Nonsense-mediated mRNA decay (NMD) is a translation-dependent, multistep process that degrades irregular or faulty messenger RNAs (mRNAs). NMD mainly targets mRNAs with a truncated open reading frame (ORF) due to premature termination codons (PTCs). In addition, NMD also regulates the expression of different types of endogenous mRNA substrates. A multitude of factors are involved in the tight regulation of the NMD mechanism. In this review, we focus on the molecular mechanism of mammalian NMD. Based on the published data, we discuss the involvement of translation termination in NMD initiation. Furthermore, we provide a detailed overview of the core NMD machinery, as well as several peripheral NMD factors, and discuss their function. Finally, we present an overview of diseases associated with NMD factor mutations and summarize the current state of treatment for genetic disorders caused by nonsense mutations.
Collapse
Affiliation(s)
- Tobias Fatscher
- Institute for Genetics, University of Cologne, Cologne, Germany
| | - Volker Boehm
- Institute for Genetics, University of Cologne, Cologne, Germany
| | - Niels H Gehring
- Institute for Genetics, University of Cologne, Cologne, Germany.
| |
Collapse
|
145
|
Tollenaere MAX, Villumsen BH, Blasius M, Nielsen JC, Wagner SA, Bartek J, Beli P, Mailand N, Bekker-Jensen S. p38- and MK2-dependent signalling promotes stress-induced centriolar satellite remodelling via 14-3-3-dependent sequestration of CEP131/AZI1. Nat Commun 2015; 6:10075. [PMID: 26616734 PMCID: PMC4674683 DOI: 10.1038/ncomms10075] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 10/30/2015] [Indexed: 12/26/2022] Open
Abstract
Centriolar satellites (CS) are small granular structures that cluster in the vicinity of centrosomes. CS are highly susceptible to stress stimuli, triggering abrupt displacement of key CS factors. Here we discover a linear p38-MK2-14-3-3 signalling pathway that specifically targets CEP131 to trigger CS remodelling after cell stress. We identify CEP131 as a substrate of the p38 effector kinase MK2 and pinpoint S47 and S78 as critical MK2 phosphorylation sites in CEP131. Ultraviolet-induced phosphorylation of these residues generates direct binding sites for 14-3-3 proteins, which sequester CEP131 in the cytoplasm to block formation of new CS, thereby leading to rapid depletion of these structures. Mutating S47 and S78 in CEP131 is sufficient to abolish stress-induced CS reorganization, demonstrating that CEP131 is the key regulatory target of MK2 and 14-3-3 in these structures. Our findings reveal the molecular mechanism underlying dynamic CS remodelling to modulate centrosome functions on cell stress. Centriolar satellites (CS) dynamically remodel in response to cellular stress. Here the authors describe a mechanism for stress-mediated remodelling, whereby CEP131 is phosphorylated downstream of p38, creating binding sites for 14-3-3 that lead to the sequestration of CEP131 in the cytoplasm and disassembly of CS.
Collapse
Affiliation(s)
- Maxim A X Tollenaere
- Ubiquitin Signaling Group, Protein Signaling Program, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, Copenhagen DK-2200, Denmark
| | - Bine H Villumsen
- Ubiquitin Signaling Group, Protein Signaling Program, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, Copenhagen DK-2200, Denmark
| | - Melanie Blasius
- Danish Cancer Society Research Center, Strandboulevarden 49, Copenhagen DK-2100, Denmark
| | - Julie C Nielsen
- Ubiquitin Signaling Group, Protein Signaling Program, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, Copenhagen DK-2200, Denmark
| | - Sebastian A Wagner
- Department of Medicine, Hematology/Oncology, Goethe University Medical School, Theodor-Stern-Kai 7, Frankfurt DE-60590, Germany
| | - Jiri Bartek
- Danish Cancer Society Research Center, Strandboulevarden 49, Copenhagen DK-2100, Denmark.,Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm SE-17176, Sweden
| | - Petra Beli
- Institute of Molecular Biology, Ackermannweg 4, Mainz DE-55128, Germany
| | - Niels Mailand
- Ubiquitin Signaling Group, Protein Signaling Program, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, Copenhagen DK-2200, Denmark
| | - Simon Bekker-Jensen
- Ubiquitin Signaling Group, Protein Signaling Program, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, Copenhagen DK-2200, Denmark
| |
Collapse
|
146
|
Cau Y, Fiorillo A, Mori M, Ilari A, Botta M, Lalle M. Molecular Dynamics Simulations and Structural Analysis of Giardia duodenalis 14-3-3 Protein-Protein Interactions. J Chem Inf Model 2015; 55:2611-22. [PMID: 26551337 DOI: 10.1021/acs.jcim.5b00452] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Giardiasis is a gastrointestinal diarrheal illness caused by the protozoan parasite Giardia duodenalis, which affects annually over 200 million people worldwide. The limited antigiardial drug arsenal and the emergence of clinical cases refractory to standard treatments dictate the need for new chemotherapeutics. The 14-3-3 family of regulatory proteins, extensively involved in protein-protein interactions (PPIs) with pSer/pThr clients, represents a highly promising target. Despite homology with human counterparts, the single 14-3-3 of G. duodenalis (g14-3-3) is characterized by a constitutive phosphorylation in a region critical for target binding, thus affecting the function and the conformation of g14-3-3/clients interaction. However, to approach the design of specific small molecule modulators of g14-3-3 PPIs, structural elucidations are required. Here, we present a detailed computational and crystallographic study exploring the implications of g14-3-3 phosphorylation on protein structure and target binding. Self-Guided Langevin Dynamics and classical molecular dynamics simulations show that phosphorylation affects locally and globally g14-3-3 conformation, inducing a structural rearrangement more suitable for target binding. Profitable features for g14-3-3/clients interaction were highlighted using a hydrophobicity-based descriptor to characterize g14-3-3 client peptides. Finally, the X-ray structure of g14-3-3 in complex with a mode-1 prototype phosphopeptide was solved and combined with structure-based simulations to identify molecular features relevant for clients binding to g14-3-3. The data presented herein provide a further and structural understanding of g14-3-3 features and set the basis for drug design studies.
Collapse
Affiliation(s)
- Ylenia Cau
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena , via Aldo Moro 2, 53019 Siena, Italy
| | - Annarita Fiorillo
- Dipartimento di Scienze Biochimiche, Sapienza Università di Roma , Piazzale A. Moro 5, 00185 Roma, Italy
| | - Mattia Mori
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena , via Aldo Moro 2, 53019 Siena, Italy.,Center for Life Nano Science@Sapienza, Istituto Italiano di Tecnologia , Viale Regina Elena 291, 00161 Roma, Italy
| | - Andrea Ilari
- CNR-Institute of Molecular Biology and Pathology (IBPM), c/o Department Biochemical Sciences "A. Rossi Fanelli", University Sapienza , P.le A. Moro 5, 00185 Roma, Italy
| | - Maurizo Botta
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena , via Aldo Moro 2, 53019 Siena, Italy.,Sbarro Institute for Cancer Research and Molecular Medicine, Center for Biotechnology, College of Science and Technology, Temple University , BioLife Science Building, Suite 333, 1900 North 12th Street, Philadelphia, Pennsylvania 19122, United States
| | - Marco Lalle
- Department of Infectious, Parasitic and Immunomediated Diseases, Istituto Superiore di Sanità , Viale Regina Elena 299, 00161 Roma, Italy
| |
Collapse
|
147
|
Revealing the binding modes and the unbinding of 14-3-3σ proteins and inhibitors by computational methods. Sci Rep 2015; 5:16481. [PMID: 26568041 PMCID: PMC4644958 DOI: 10.1038/srep16481] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Accepted: 10/14/2015] [Indexed: 12/20/2022] Open
Abstract
The 14-3-3σ proteins are a family of ubiquitous conserved eukaryotic regulatory molecules involved in the regulation of mitogenic signal transduction, apoptotic cell death, and cell cycle control. A lot of small-molecule inhibitors have been identified for 14-3-3 protein-protein interactions (PPIs). In this work, we carried out molecular dynamics (MD) simulations combined with molecular mechanics generalized Born surface area (MM-GBSA) method to study the binding mechanism between a 14-3-3σ protein and its eight inhibitors. The ranking order of our calculated binding free energies is in agreement with the experimental results. We found that the binding free energies are mainly from interactions between the phosphate group of the inhibitors and the hydrophilic residues. To improve the binding free energy of Rx group, we designed the inhibitor R9 with group R9 = 4-hydroxypheny. However, we also found that the binding free energy of inhibitor R9 is smaller than that of inhibitor R1. By further using the steer molecular dynamics (SMD) simulations, we identified a new hydrogen bond between the inhibitor R8 and residue Arg64 in the pulling paths. The information obtained from this study may be valuable for future rational design of novel inhibitors, and provide better structural understanding of inhibitor binding to 14-3-3σ proteins.
Collapse
|
148
|
Assato PA, da Silva JDF, de Oliveira HC, Marcos CM, Rossi D, Valentini SR, Mendes-Giannini MJS, Zanelli CF, Fusco-Almeida AM. Functional analysis of Paracoccidioides brasiliensis 14-3-3 adhesin expressed in Saccharomyces cerevisiae. BMC Microbiol 2015; 15:256. [PMID: 26537993 PMCID: PMC4634143 DOI: 10.1186/s12866-015-0586-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 10/23/2015] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND 14-3-3 proteins comprise a family of eukaryotic multifunctional proteins involved in several cellular processes. The Pb14-3-3 of Paracoccidioides brasiliensis seems to play an important role in the Paracoccidioides-host interaction. Paracoccidioides brasiliensis is an etiological agent of paracoccidioidomycosis, which is a systemic mycosis that is endemic in Latin America. In the initial steps of the infection, Paracoccidioides spp. synthetizes adhesins that allow it to adhere and invade host cells. Therefore, the aim of this work was to perform a functional analysis of Pb14-3-3 using Saccharomyces cerevisiae as a model. RESULTS The functional analysis of Pb14-3-3 was performed in S. cerevisiae, and it was found that Pb14-3-3 partially complemented S. cerevisiae proteins Bmh1p and Bmh2p, which are recognized as two yeast 14-3-3 homologues. When we evaluated the adhesion profile of S. cerevisiae transformants, Pb14-3-3 acted as an adhesin in S. cerevisiae; however, Bmh1p did not show this function. The influence of Pb14-3-3 in S. cerevisiae ergosterol pathway was also evaluated and our results showed that Pb14-3-3 up-regulates genes involved in ergosterol biosynthesis. CONCLUSIONS Our data showed that Pb14-3-3 was able to partially complement Bmh1p and Bmh2p proteins in S. cerevisiae; however, we suggest that Pb14-3-3 has a differential role as an adhesin. In addition, Pb-14-3-3 may be involved in Paracoccidioides spp. ergosterol biosynthesis which makes it an interest as a therapeutic target.
Collapse
Affiliation(s)
- Patricia Akemi Assato
- Laboratório de Micologia Clínica - Núcleo de Proteômica - Faculdade de Ciências Farmacêuticas- Unesp - Campus Araraquara, Rodovia Araraquara - Jaú Km 1, 14801-902, Araraquara, SP, Brazil.
| | - Julhiany de Fátima da Silva
- Laboratório de Micologia Clínica - Núcleo de Proteômica - Faculdade de Ciências Farmacêuticas- Unesp - Campus Araraquara, Rodovia Araraquara - Jaú Km 1, 14801-902, Araraquara, SP, Brazil.
| | - Haroldo Cesar de Oliveira
- Laboratório de Micologia Clínica - Núcleo de Proteômica - Faculdade de Ciências Farmacêuticas- Unesp - Campus Araraquara, Rodovia Araraquara - Jaú Km 1, 14801-902, Araraquara, SP, Brazil.
| | - Caroline Maria Marcos
- Laboratório de Micologia Clínica - Núcleo de Proteômica - Faculdade de Ciências Farmacêuticas- Unesp - Campus Araraquara, Rodovia Araraquara - Jaú Km 1, 14801-902, Araraquara, SP, Brazil.
| | - Danuza Rossi
- Laboratório de Biologia Molecular - Faculdade de Ciências Farmacêuticas- Unesp - Campus Araraquara, Rodovia Araraquara - Jaú Km 1, 14801-902, Araraquara, SP, Brazil.
| | - Sandro Roberto Valentini
- Laboratório de Biologia Molecular - Faculdade de Ciências Farmacêuticas- Unesp - Campus Araraquara, Rodovia Araraquara - Jaú Km 1, 14801-902, Araraquara, SP, Brazil.
| | - Maria José Soares Mendes-Giannini
- Laboratório de Micologia Clínica - Núcleo de Proteômica - Faculdade de Ciências Farmacêuticas- Unesp - Campus Araraquara, Rodovia Araraquara - Jaú Km 1, 14801-902, Araraquara, SP, Brazil.
| | - Cleslei Fernando Zanelli
- Laboratório de Biologia Molecular - Faculdade de Ciências Farmacêuticas- Unesp - Campus Araraquara, Rodovia Araraquara - Jaú Km 1, 14801-902, Araraquara, SP, Brazil.
| | - Ana Marisa Fusco-Almeida
- Laboratório de Micologia Clínica - Núcleo de Proteômica - Faculdade de Ciências Farmacêuticas- Unesp - Campus Araraquara, Rodovia Araraquara - Jaú Km 1, 14801-902, Araraquara, SP, Brazil.
| |
Collapse
|
149
|
Sbiera S, Deutschbein T, Weigand I, Reincke M, Fassnacht M, Allolio B. The New Molecular Landscape of Cushing's Disease. Trends Endocrinol Metab 2015; 26:573-583. [PMID: 26412158 DOI: 10.1016/j.tem.2015.08.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Revised: 08/05/2015] [Accepted: 08/08/2015] [Indexed: 11/21/2022]
Abstract
Cushing's disease (CD) is caused by corticotropin-secreting pituitary adenomas and results in substantial morbidity and mortality. Its molecular basis has remained poorly understood until the past few years, when several proteins and genes [such as testicular orphan nuclear receptor 4 (TR4) and heat shock protein 90 (HSP90)] were found to play key roles in the disease. Most recently, mutations in the gene of ubiquitin-specific peptidase 8 (USP8) increasing its deubiquination activity were discovered in a high percentage of corticotroph adenomas. Here, we will discuss emerging insights in the molecular alterations that finally result in CD. The therapeutic potential of these findings needs to be carefully evaluated in the near future, hopefully resulting in new treatment options for this devastating disorder.
Collapse
Affiliation(s)
- Silviu Sbiera
- Department of Internal Medicine I, Endocrine and Diabetes Unit, University Hospital Würzburg, University of Würzburg, Würzburg, Germany
| | - Timo Deutschbein
- Department of Internal Medicine I, Endocrine and Diabetes Unit, University Hospital Würzburg, University of Würzburg, Würzburg, Germany
| | - Isabel Weigand
- Department of Internal Medicine I, Endocrine and Diabetes Unit, University Hospital Würzburg, University of Würzburg, Würzburg, Germany
| | - Martin Reincke
- Endocrine Research Unit, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Munich, Germany
| | - Martin Fassnacht
- Comprehensive Cancer Center Mainfranken, University of Würzburg, Würzburg, Germany.
| | - Bruno Allolio
- Department of Internal Medicine I, Endocrine and Diabetes Unit, University Hospital Würzburg, University of Würzburg, Würzburg, Germany
| |
Collapse
|
150
|
Chakravarti R, Gupta K, Swain M, Willard B, Scholtz J, Svensson LG, Roselli EE, Pettersson G, Johnston DR, Soltesz EG, Yamashita M, Stuehr D, Daly TM, Hoffman GS. 14-3-3 in Thoracic Aortic Aneurysms: Identification of a Novel Autoantigen in Large Vessel Vasculitis. Arthritis Rheumatol 2015; 67:1913-21. [PMID: 25917817 DOI: 10.1002/art.39130] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 03/19/2015] [Indexed: 01/14/2023]
Abstract
OBJECTIVE Large vessel vasculitides (LVV) are a group of autoimmune diseases characterized by injury to and anatomic modifications of large vessels, including the aorta and its branch vessels. Disease etiology is unknown. This study was undertaken to identify antigen targets within affected vessel walls in aortic root, ascending aorta, and aortic arch surgical specimens from patients with LVV, including giant cell arteritis, Takayasu arteritis, and isolated focal aortitis. METHODS Thoracic aortic aneurysm specimens and autologous blood were acquired from consenting patients who underwent aorta reconstruction procedures. Aorta proteins were extracted from both patients with LVV and age-, race-, and sex-matched disease controls with noninflammatory aneurysms. A total of 108 serum samples from patients with LVV, matched controls, and controls with antinuclear antibodies, different forms of vasculitis, or sepsis were tested. RESULTS Evaluation of 108 serum samples and 22 aortic tissue specimens showed that 78% of patients with LVV produced antibodies to 14-3-3 proteins in the aortic wall (93.7% specificity), whereas controls were less likely to do so (6.7% produced antibodies). LVV patient sera contained autoantibody sufficient to immunoprecipitate 14-3-3 protein(s) from aortic lysates. Three of 7 isoforms of 14-3-3 were found to be up-regulated in aorta specimens from patients with LVV, and 2 isoforms (ε and ζ) were found to be antigenic in LVV. CONCLUSION This is the first study to use sterile, snap-frozen thoracic aorta biopsy specimens to identify autoantigens in LVV. Our findings indicate that 78% of patients with LVV have antibody reactivity to 14-3-3 protein(s). The precise role of these antibodies and 14-3-3 proteins in LVV pathogenesis deserves further study.
Collapse
|