1
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Altas B, Rhee HJ, Ju A, Solís HC, Karaca S, Winchenbach J, Kaplan-Arabaci O, Schwark M, Ambrozkiewicz MC, Lee C, Spieth L, Wieser GL, Chaugule VK, Majoul I, Hassan MA, Goel R, Wojcik SM, Koganezawa N, Hanamura K, Rotin D, Pichler A, Mitkovski M, de Hoz L, Poulopoulos A, Urlaub H, Jahn O, Saher G, Brose N, Rhee J, Kawabe H. Nedd4-2-dependent regulation of astrocytic Kir4.1 and Connexin43 controls neuronal network activity. J Cell Biol 2024; 223:e201902050. [PMID: 38032389 PMCID: PMC10689203 DOI: 10.1083/jcb.201902050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 10/21/2021] [Accepted: 11/02/2023] [Indexed: 12/01/2023] Open
Abstract
Nedd4-2 is an E3 ubiquitin ligase in which missense mutation is related to familial epilepsy, indicating its critical role in regulating neuronal network activity. However, Nedd4-2 substrates involved in neuronal network function have yet to be identified. Using mouse lines lacking Nedd4-1 and Nedd4-2, we identified astrocytic channel proteins inwardly rectifying K+ channel 4.1 (Kir4.1) and Connexin43 as Nedd4-2 substrates. We found that the expression of Kir4.1 and Connexin43 is increased upon conditional deletion of Nedd4-2 in astrocytes, leading to an elevation of astrocytic membrane ion permeability and gap junction activity, with a consequent reduction of γ-oscillatory neuronal network activity. Interestingly, our biochemical data demonstrate that missense mutations found in familial epileptic patients produce gain-of-function of the Nedd4-2 gene product. Our data reveal a process of coordinated astrocytic ion channel proteostasis that controls astrocyte function and astrocyte-dependent neuronal network activity and elucidate a potential mechanism by which aberrant Nedd4-2 function leads to epilepsy.
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Affiliation(s)
- Bekir Altas
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- International Max Planck Research School and the Göttingen Graduate School for Neurosciences, Biophysics and Molecular Biosciences, Göttingen, Germany
- The Göttingen Graduate School for Neurosciences, Biophysics, and Molecular Biosciences, PhD Program Systems Neuroscience, University of Göttingen, Göttingen, Germany
- Department of Pharmacology and Program in Neuroscience, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Hong-Jun Rhee
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Anes Ju
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- The Göttingen Graduate School for Neurosciences, Biophysics, and Molecular Biosciences, PhD Program Systems Neuroscience, University of Göttingen, Göttingen, Germany
| | - Hugo Cruces Solís
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- International Max Planck Research School and the Göttingen Graduate School for Neurosciences, Biophysics and Molecular Biosciences, Göttingen, Germany
- Department of Neurogenetics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Samir Karaca
- International Max Planck Research School and the Göttingen Graduate School for Neurosciences, Biophysics and Molecular Biosciences, Göttingen, Germany
- Bioanalytical Mass Spectrometry Group, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Jan Winchenbach
- The Göttingen Graduate School for Neurosciences, Biophysics, and Molecular Biosciences, PhD Program Systems Neuroscience, University of Göttingen, Göttingen, Germany
- Department of Neurogenetics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Oykum Kaplan-Arabaci
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- The Göttingen Graduate School for Neurosciences, Biophysics, and Molecular Biosciences, PhD Program Molecular Physiology of the Brain, University of Göttingen, Göttingen, Germany
| | - Manuela Schwark
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Mateusz C. Ambrozkiewicz
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- International Max Planck Research School and the Göttingen Graduate School for Neurosciences, Biophysics and Molecular Biosciences, Göttingen, Germany
- Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - ChungKu Lee
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Lena Spieth
- Department of Neurogenetics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Georg L. Wieser
- City Campus Light Microscopy Facility, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Viduth K. Chaugule
- Department of Epigenetics, Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
| | - Irina Majoul
- Institute of Biology, Center for Structural and Cell Biology in Medicine, University of Lübeck, Lübeck, Germany
| | - Mohamed A. Hassan
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Protein Research Department, Genetic Engineering and Biotechnology Research Institute (GEBRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, Egypt
| | - Rashi Goel
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Sonja M. Wojcik
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Noriko Koganezawa
- Department of Pharmacology, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Kenji Hanamura
- Department of Pharmacology, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Daniela Rotin
- The Hospital for Sick Children and University of Toronto, Toronto, Canada
| | - Andrea Pichler
- Department of Epigenetics, Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
| | - Miso Mitkovski
- City Campus Light Microscopy Facility, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Livia de Hoz
- Department of Neurogenetics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Alexandros Poulopoulos
- Department of Pharmacology and Program in Neuroscience, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Henning Urlaub
- Bioanalytical Mass Spectrometry Group, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Bioanalytics, Institute for Clinical Chemistry, University Medical Center Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells” (MBExC), University of Göttingen, Göttingen, Germany
| | - Olaf Jahn
- Department of Molecular Neurobiology, Neuroproteomics Group, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Department of Psychiatry and Psychotherapy, Translational Neuroproteomics Group, University Medical Center Göttingen, Göttingen, Germany
| | - Gesine Saher
- Department of Neurogenetics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Nils Brose
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - JeongSeop Rhee
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Hiroshi Kawabe
- Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Department of Pharmacology, Gunma University Graduate School of Medicine, Maebashi, Japan
- Division of Pathogenetic Signaling, Department of Biochemistry and Molecular Biology, Kobe University Graduate School of Medicine, Kobe, Japan
- Department of Gerontology, Laboratory of Molecular Life Science, Institute of Biomedical Research and Innovation, Foundation for Biomedical Research and Innovation at Kobe, Kobe, Japan
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2
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Rotin D, Prag G. Physiological Functions of the Ubiquitin Ligases Nedd4-1 and Nedd4-2. Physiology (Bethesda) 2024; 39:18-29. [PMID: 37962894 DOI: 10.1152/physiol.00023.2023] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 11/13/2023] [Accepted: 11/13/2023] [Indexed: 11/15/2023] Open
Abstract
The Nedd4 family of E3 ubiquitin ligases, consisting of a C2-WW(n)-HECT domain architecture, includes the closely related Nedd4/Nedd4-1 and Nedd4L/Nedd4-2, which play critical roles in human physiology and pathophysiology.This review focuses on the regulation of enzymatic activity of these Nedd4 proteins, as well as on their roles in regulating stability and function of membrane and other signaling proteins, such as ion channels, ion transporters, and growth factor receptors. The diseases caused by impairment of such regulation are discussed, as well as opportunities and challenges for targeting these enzymes for therapy.
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Affiliation(s)
- Daniela Rotin
- Cell Biology Program, The Hospital for Sick Children, Toronto, Ontario, Canada
- Biochemistry Department, University of Toronto, Ontario, Canada
| | - Gali Prag
- School of Neurobiology, Biochemistry and Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Israel
- Sagol School of Neuroscience, Tel Aviv University, Israel
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3
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Kefalas G, Rotin D. Primate-specific isoform of Nedd4-1 regulates substrate binding via Ser/Thr phosphorylation and 14-3-3 binding. Sci Rep 2023; 13:17903. [PMID: 37863970 PMCID: PMC10589272 DOI: 10.1038/s41598-023-44761-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 10/12/2023] [Indexed: 10/22/2023] Open
Abstract
Nedd4 (Nedd4-1) is an E3 ubiquitin ligase involved in crucial biological processes such as growth factor receptor signaling. While canonical Nedd4-1 comprises a C2-WW(4)-HECT domain architecture, alternative splicing produces non-canonical isoforms that are poorly characterized. Here we characterized Nedd4-1(NE), a primate-specific isoform of Nedd4-1 that contains a large N-terminal Extension (NE) that replaces most of the C2 domain. We show that Nedd4-1(NE) mRNA is ubiquitously expressed in human tissues and cell lines. Moreover, we found that Nedd4-1(NE) is more active than the canonical Nedd4-1 isoform, likely due to the absence of a C2 domain-mediated autoinhibitory mechanism. Additionally, we identified two Thr/Ser phosphoresidues in the NE region that act as binding sites for 14-3-3 proteins, and show that phosphorylation on these sites reduces substrate binding. Finally, we show that the NE region can act as a binding site for the RPB2 subunit of RNA polymerase II, a unique substrate of Nedd4-1(NE) but not the canonical Nedd4-1. Taken together, our results demonstrate that alternative splicing of the ubiquitin ligase Nedd4-1 can produce isoforms that differ in their catalytic activity, binding partners and substrates, and mechanisms of regulation.
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Affiliation(s)
- George Kefalas
- Cell Biology Program, the Hospital for Sick Children, PGCRL 19-9715, 686 Bay Street, Toronto, ON, M5G 0A4, Canada
- Biochemistry Department, University of Toronto, Toronto, ON, M5G 0A4, Canada
| | - Daniela Rotin
- Cell Biology Program, the Hospital for Sick Children, PGCRL 19-9715, 686 Bay Street, Toronto, ON, M5G 0A4, Canada.
- Biochemistry Department, University of Toronto, Toronto, ON, M5G 0A4, Canada.
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4
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Liu Z, Demian W, Persaud A, Jiang C, Subramanaya AR, Rotin D. Regulation of the p38-MAPK pathway by hyperosmolarity and by WNK kinases. Sci Rep 2022; 12:14480. [PMID: 36008477 PMCID: PMC9411163 DOI: 10.1038/s41598-022-18630-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Accepted: 08/16/2022] [Indexed: 12/01/2022] Open
Abstract
p38-MAPK is a stress-response kinase activated by hyperosmolarity. Here we interrogated the pathways involved. We show that p38-MAPK signaling is activated by hyperosmotic stimulation in various solutions, cell types and colonic organoids. Hyperosmolarity sensing is detected at the level of the upstream activators of p38-MAPK: TRAF2/ASK1 (but not Rac1) and MKK3/6/4. While WNK kinases are known osmo-sensors, we found, unexpectedly, that short (2 h) inhibition of WNKs (with WNK463) led to elevated p38-MAPK activity under hyperosmolarity, which was mediated by WNK463-dependent stimulation of TAK1 or TRAF2/ASK1, the upstream activators of MKK3/6/4. However, this effect was temporary and was reversed by long-term (2 days) incubation with WNK463. Accordingly, 2 days (but not 2 h) inhibition of p38-MAPK or its upstream activators ASK1 or TAK1, or WNKs, diminished regulatory volume increase (RVI) following cell shrinkage under hyperosmolarity. We also show that RVI mediated by the ion transporter NKCC1 is dependent on p38-MAPK. Since WNKs are known activators of NKCC1, we propose a WNK- > NKCC1- > p38-MAPK pathway that controls RVI. This pathway is augmented by NHE1. Additionally, hyperosmolarity inhibited mTORC1 activation and cell proliferation. Thus, activation of p38-MAPK and WNKs is important for RVI and for cell proliferation.
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Affiliation(s)
- Zetao Liu
- Cell Biology Program, The Hospital for Sick Children, PGCRL 19-9715, 686 Bay St., Toronto, ON, M5G 0A4, Canada
- Biochemistry Department, University of Toronto, Toronto, ON, Canada
| | - Wael Demian
- Cell Biology Program, The Hospital for Sick Children, PGCRL 19-9715, 686 Bay St., Toronto, ON, M5G 0A4, Canada
- Biochemistry Department, University of Toronto, Toronto, ON, Canada
| | - Avinash Persaud
- Cell Biology Program, The Hospital for Sick Children, PGCRL 19-9715, 686 Bay St., Toronto, ON, M5G 0A4, Canada
| | - Chong Jiang
- Cell Biology Program, The Hospital for Sick Children, PGCRL 19-9715, 686 Bay St., Toronto, ON, M5G 0A4, Canada
| | - Arohan R Subramanaya
- Department of Medicine and Cell Biology, University of Pittsburgh, Pittsburgh, USA
| | - Daniela Rotin
- Cell Biology Program, The Hospital for Sick Children, PGCRL 19-9715, 686 Bay St., Toronto, ON, M5G 0A4, Canada.
- Biochemistry Department, University of Toronto, Toronto, ON, Canada.
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5
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Xia S, Bozóky Z, Di Paola M, Laselva O, Ahmadi S, Jiang JX, Pitstick AL, Jiang C, Rotin D, Mayhew CN, Jones NL, Bear CE. High-Throughput Functional Analysis of CFTR and Other Apically Localized Proteins in iPSC-Derived Human Intestinal Organoids. Cells 2021; 10:cells10123419. [PMID: 34943927 PMCID: PMC8699884 DOI: 10.3390/cells10123419] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 11/26/2021] [Accepted: 11/30/2021] [Indexed: 01/15/2023] Open
Abstract
Induced Pluripotent Stem Cells (iPSCs) can be differentiated into epithelial organoids that recapitulate the relevant context for CFTR and enable testing of therapies targeting Cystic Fibrosis (CF)-causing mutant proteins. However, to date, CF-iPSC-derived organoids have only been used to study pharmacological modulation of mutant CFTR channel activity and not the activity of other disease-relevant membrane protein constituents. In the current work, we describe a high-throughput, fluorescence-based assay of CFTR channel activity in iPSC-derived intestinal organoids and describe how this method can be adapted to study other apical membrane proteins. Specifically, we show how this assay can be employed to study CFTR and ENaC channels and an electrogenic acid transporter in the same iPSC-derived intestinal tissue. This phenotypic platform promises to expand CF therapy discovery to include strategies that target multiple determinants of epithelial fluid transport.
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Affiliation(s)
- Sunny Xia
- Molecular Medicine, Hospital for Sick Children, 686 Bay St, Toronto, ON M5G 0A4, Canada; (S.X.); (Z.B.); (O.L.); (J.X.J.)
- Cell Biology, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; (C.J.); (D.R.); (N.L.J.)
- Department of Physiology, University of Toronto, Toronto, ON M5S 1A8, Canada;
| | - Zoltán Bozóky
- Molecular Medicine, Hospital for Sick Children, 686 Bay St, Toronto, ON M5G 0A4, Canada; (S.X.); (Z.B.); (O.L.); (J.X.J.)
| | - Michelle Di Paola
- Department of Physiology, University of Toronto, Toronto, ON M5S 1A8, Canada;
| | - Onofrio Laselva
- Molecular Medicine, Hospital for Sick Children, 686 Bay St, Toronto, ON M5G 0A4, Canada; (S.X.); (Z.B.); (O.L.); (J.X.J.)
- Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy
| | - Saumel Ahmadi
- Department of Neurology, Washington University in St. Louis, St. Louis, MO 63110, USA;
| | - Jia Xin Jiang
- Molecular Medicine, Hospital for Sick Children, 686 Bay St, Toronto, ON M5G 0A4, Canada; (S.X.); (Z.B.); (O.L.); (J.X.J.)
| | - Amy L. Pitstick
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA; (A.L.P.); (C.N.M.)
| | - Chong Jiang
- Cell Biology, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; (C.J.); (D.R.); (N.L.J.)
| | - Daniela Rotin
- Cell Biology, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; (C.J.); (D.R.); (N.L.J.)
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 0A4, Canada
| | - Christopher N. Mayhew
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA; (A.L.P.); (C.N.M.)
| | - Nicola L. Jones
- Cell Biology, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; (C.J.); (D.R.); (N.L.J.)
- Department of Physiology, University of Toronto, Toronto, ON M5S 1A8, Canada;
- Department of Paediatrics, University of Toronto, Toronto, ON M5G 0A4, Canada
| | - Christine E. Bear
- Molecular Medicine, Hospital for Sick Children, 686 Bay St, Toronto, ON M5G 0A4, Canada; (S.X.); (Z.B.); (O.L.); (J.X.J.)
- Department of Physiology, University of Toronto, Toronto, ON M5S 1A8, Canada;
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 0A4, Canada
- Correspondence:
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6
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Levin-Kravets O, Kordonsky A, Shusterman A, Biswas S, Persaud A, Elias S, Langut Y, Florentin A, Simpson-Lavy KJ, Yariv E, Avishid R, Sror M, Almog O, Marshanski T, Kadosh S, Ben David N, Manori B, Fischer Z, Lilly J, Borisova E, Ambrozkiewicz MC, Tarabykin V, Kupiec M, Thaker M, Rotin D, Prag G. Split Chloramphenicol Acetyl-Transferase Assay Reveals Self-Ubiquitylation-Dependent Regulation of UBE3B. J Mol Biol 2021; 433:167276. [PMID: 34599943 DOI: 10.1016/j.jmb.2021.167276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 09/20/2021] [Accepted: 09/22/2021] [Indexed: 10/20/2022]
Abstract
Split reporter protein-based genetic section systems are widely used to identify and characterize protein-protein interactions (PPI). The assembly of split markers that antagonize toxins, rather than required for synthesis of missing metabolites, facilitates the seeding of high density of cells and selective growth. Here we present a newly developed split chloramphenicol acetyltransferase (split-CAT) -based genetic selection system. The N terminus fragment of CAT is fused downstream of the protein of interest and the C terminus fragment is tethered upstream to its postulated partner. We demonstrate the system's advantages for the study of PPIs. Moreover, we show that co-expression of a functional ubiquitylation cascade where the target and ubiquitin are tethered to the split-CAT fragments results in ubiquitylation-dependent selective growth. Since proteins do not have to be purified from the bacteria and due to the high sensitivity of the split-CAT reporter, detection of challenging protein cascades and post-translation modifications is enabled. In addition, we demonstrate that the split-CAT system responds to small molecule inhibitors and molecular glues (GLUTACs). The absence of ubiquitylation-dependent degradation and deubiquitylation in E. coli significantly simplify the interpretation of the results. We harnessed the developed system to demonstrate that like NEDD4, UBE3B also undergoes self-ubiquitylation-dependent inactivation. We show that self-ubiquitylation of UBE3B on K665 induces oligomerization and inactivation in yeast and mammalian cells respectively. Finally, we showcase the advantages of split-CAT in the study of human diseases by demonstrating that mutations in UBE3B that cause Kaufman oculocerebrofacial syndrome exhibit clear E. coli growth phenotypes.
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Affiliation(s)
- Olga Levin-Kravets
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Alina Kordonsky
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Anna Shusterman
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Sagnik Biswas
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Avinash Persaud
- Cell Biology Program, The Hospital for Sick Children and Biochemistry Department, University of Toronto, Toronto, ON, Canada
| | - Sivan Elias
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Yael Langut
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Amir Florentin
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Kobi J Simpson-Lavy
- The Shmunis School of Biomedicine and Cancer Research, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Elon Yariv
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Reut Avishid
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Mor Sror
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Ofir Almog
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Tal Marshanski
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel. https://twitter.com/@TalMarsh
| | - Shira Kadosh
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Nicole Ben David
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Bar Manori
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Zohar Fischer
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Jeremiah Lilly
- Novartis Institutes for Biomedical Research, 250 Massachusetts Ave., Cambridge, MA 02139, USA
| | - Ekaterina Borisova
- Institute of Medical Genetics, Tomsk National Research Medical Center Neuroscience, Lobachevsky University of the Russian Academy of Sciences Nizhny Novgorod, pr. Gagarina 24, Nizhny Novgorod, Russia; Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Charitéplatz 1, 10117 Berlin, Germany
| | - Mateusz C Ambrozkiewicz
- Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Charitéplatz 1, 10117 Berlin, Germany. https://twitter.com/@MAmbrozkiewicz
| | - Victor Tarabykin
- Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Charitéplatz 1, 10117 Berlin, Germany
| | - Martin Kupiec
- The Shmunis School of Biomedicine and Cancer Research, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
| | - Maulik Thaker
- Novartis Institutes for Biomedical Research, 250 Massachusetts Ave., Cambridge, MA 02139, USA
| | - Daniela Rotin
- Cell Biology Program, The Hospital for Sick Children and Biochemistry Department, University of Toronto, Toronto, ON, Canada
| | - Gali Prag
- School of Neurobiology, Biochemistry & Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel; Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel.
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7
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Abstract
The Epithelial Na+ Channel, ENaC, comprised of 3 subunits (αβγ, or sometimes δβγENaC), plays a critical role in regulating salt and fluid homeostasis in the body. It regulates fluid reabsorption into the blood stream from the kidney to control blood volume and pressure, fluid absorption in the lung to control alveolar fluid clearance at birth and maintenance of normal airway surface liquid throughout life, and fluid absorption in the distal colon and other epithelial tissues. Moreover, recent studies have also revealed a role for sodium movement via ENaC in nonepithelial cells/tissues, such as endothelial cells in blood vessels and neurons. Over the past 25 years, major advances have been made in our understanding of ENaC structure, function, regulation, and role in human disease. These include the recently solved three-dimensional structure of ENaC, ENaC function in various tissues, and mutations in ENaC that cause a hereditary form of hypertension (Liddle syndrome), salt-wasting hypotension (PHA1), or polymorphism in ENaC that contributes to other diseases (such as cystic fibrosis). Moreover, great strides have been made in deciphering the regulation of ENaC by hormones (e.g., the mineralocorticoid aldosterone, glucocorticoids, vasopressin), ions (e.g., Na+ ), proteins (e.g., the ubiquitin-protein ligase NEDD4-2, the kinases SGK1, AKT, AMPK, WNKs & mTORC2, and proteases), and posttranslational modifications [e.g., (de)ubiquitylation, glycosylation, phosphorylation, acetylation, palmitoylation]. Characterization of ENaC structure, function, regulation, and role in human disease, including using animal models, are described in this article, with a special emphasis on recent advances in the field. © 2021 American Physiological Society. Compr Physiol 11:1-29, 2021.
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Affiliation(s)
- Daniela Rotin
- The Hospital for Sick Children, and The University of Toronto, Toronto, Canada
| | - Olivier Staub
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland
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8
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Degrugillier F, Aissat A, Prulière-Escabasse V, Bizard L, Simonneau B, Decrouy X, Jiang C, Rotin D, Fanen P, Simon S. Phosphorylation of the Chaperone-Like HspB5 Rescues Trafficking and Function of F508del-CFTR. Int J Mol Sci 2020; 21:ijms21144844. [PMID: 32650630 PMCID: PMC7402320 DOI: 10.3390/ijms21144844] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/02/2020] [Accepted: 07/04/2020] [Indexed: 02/07/2023] Open
Abstract
Cystic Fibrosis is a lethal monogenic autosomal recessive disease linked to mutations in Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) protein. The most frequent mutation is the deletion of phenylalanine at position 508 of the protein. This F508del-CFTR mutation leads to misfolded protein that is detected by the quality control machinery within the endoplasmic reticulum and targeted for destruction by the proteasome. Modulating quality control proteins as molecular chaperones is a promising strategy for attenuating the degradation and stabilizing the mutant CFTR at the plasma membrane. Among the molecular chaperones, the small heat shock protein HspB1 and HspB4 were shown to promote degradation of F508del-CFTR. Here, we investigated the impact of HspB5 expression and phosphorylation on transport to the plasma membrane, function and stability of F508del-CFTR. We show that a phosphomimetic form of HspB5 increases the transport to the plasma membrane, function and stability of F508del-CFTR. These activities are further enhanced in presence of therapeutic drugs currently used for the treatment of cystic fibrosis (VX-770/Ivacaftor, VX-770+VX-809/Orkambi). Overall, this study highlights the beneficial effects of a phosphorylated form of HspB5 on F508del-CFTR rescue and its therapeutic potential in cystic fibrosis.
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Affiliation(s)
- Fanny Degrugillier
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
| | - Abdel Aissat
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
- AP-HP, Hôpital Henri Mondor, Département de Génétique, F-94010 Creteil, France
| | - Virginie Prulière-Escabasse
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
- Centre Hospitalier Intercommunal de Creteil, Service d’ORL et de Chirurgie Cervico-Faciale, F-94010 Creteil, France
| | - Lucie Bizard
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
| | - Benjamin Simonneau
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
| | - Xavier Decrouy
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
| | - Chong Jiang
- The Hospital for Sick Children and the University of Toronto, Toronto, ON M5G 0A4, Canada; (C.J.); (D.R.)
| | - Daniela Rotin
- The Hospital for Sick Children and the University of Toronto, Toronto, ON M5G 0A4, Canada; (C.J.); (D.R.)
| | - Pascale Fanen
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
- AP-HP, Hôpital Henri Mondor, Département de Génétique, F-94010 Creteil, France
| | - Stéphanie Simon
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
- Correspondence: ; Tel.: +33-1-49-81-68-55
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9
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Demian WL, Persaud A, Jiang C, Coyaud É, Liu S, Kapus A, Kafri R, Raught B, Rotin D. The Ion Transporter NKCC1 Links Cell Volume to Cell Mass Regulation by Suppressing mTORC1. Cell Rep 2020; 27:1886-1896.e6. [PMID: 31067471 DOI: 10.1016/j.celrep.2019.04.034] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 02/13/2019] [Accepted: 04/05/2019] [Indexed: 01/08/2023] Open
Abstract
mTORC1 regulates cellular growth and is activated by growth factors and by essential amino acids such as Leu. Leu enters cells via the Leu transporter LAT1-4F2hc (LAT1). Here we show that the Na+/K+/2Cl- cotransporter NKCC1 (SLC12A2), a known regulator of cell volume, is present in complex with LAT1. We further show that NKCC1 depletion or deletion enhances LAT1 activity, as well as activation of Akt and Erk, leading to activation of mTORC1 in cells, colonic organoids, and mouse colon. Moreover, NKCC1 depletion reduces intracellular Na+ concentration and cell volume (size) and mass and stimulates cell proliferation. NKCC1, therefore, suppresses mTORC1 by inhibiting its key activating signaling pathways. Importantly, by linking ion transport and cell volume regulation to mTORC1 function, NKCC1 provides a long-sought link connecting cell volume (size) to cell mass regulation.
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Affiliation(s)
- Wael L Demian
- Program in Cell Biology, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; Biochemistry Department, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Avinash Persaud
- Program in Cell Biology, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; Biochemistry Department, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Chong Jiang
- Program in Cell Biology, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Étienne Coyaud
- Princess Margaret Cancer Centre, University Health Network, Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 2C1, Canada
| | - Shixuan Liu
- Biochemistry Department, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Andras Kapus
- Biochemistry Department, University of Toronto, Toronto, ON M5S 1A8, Canada; St. Michael Hospital Research Institute, Toronto, ON M5B 1W8, Canada
| | - Ran Kafri
- Biochemistry Department, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Brian Raught
- Princess Margaret Cancer Centre, University Health Network, Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 2C1, Canada
| | - Daniela Rotin
- Program in Cell Biology, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; Biochemistry Department, University of Toronto, Toronto, ON M5S 1A8, Canada.
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10
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Wasserman SS, Shteiman-Kotler A, Harris K, Iliadi KG, Persaud A, Zhong Y, Zhang Y, Fang X, Boulianne GL, Stewart B, Rotin D. Regulation of SH3PX1 by dNedd4-long at the Drosophila neuromuscular junction. J Biol Chem 2018; 294:1739-1752. [PMID: 30518551 DOI: 10.1074/jbc.ra118.005161] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 11/12/2018] [Indexed: 11/06/2022] Open
Abstract
Drosophila Nedd4 (dNedd4) is a HECT E3 ubiquitin ligase present in two major isoforms: short (dNedd4S) and long (dNedd4Lo), with the latter containing two unique regions (N terminus and Middle). Although dNedd4S promotes neuromuscular synaptogenesis (NMS), dNedd4Lo inhibits it and impairs larval locomotion. To explain how dNedd4Lo inhibits NMS, MS analysis was performed to find its binding partners and identified SH3PX1, which binds dNedd4Lo unique Middle region. SH3PX1 contains SH3, PX, and BAR domains and is present at neuromuscular junctions, where it regulates active zone ultrastructure and presynaptic neurotransmitter release. Here, we demonstrate direct binding of SH3PX1 to the dNedd4Lo Middle region (which contains a Pro-rich sequence) in vitro and in cells, via the SH3PX1-SH3 domain. In Drosophila S2 cells, dNedd4Lo overexpression reduces SH3PX1 levels at the cell periphery. In vivo overexpression of dNedd4Lo post-synaptically, but not pre-synaptically, reduces SH3PX1 levels at the subsynaptic reticulum and impairs neurotransmitter release. Unexpectedly, larvae that overexpress dNedd4Lo post-synaptically and are heterozygous for a null mutation in SH3PX1 display increased neurotransmission compared with dNedd4Lo or SH3PX1 mutant larvae alone, suggesting a compensatory effect from the remaining SH3PX1 allele. These results suggest a post-synaptic-specific regulation of SH3PX1 by dNedd4Lo.
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Affiliation(s)
- Samantha S Wasserman
- Hospital for Sick Children, Cell Biology and Developmental and Stem Cell Biology programs, University of Toronto, Ontario M5G 0A4, Canada; Department of Biochemistry, University of Toronto, Ontario M5G 0A4, Canada
| | - Alina Shteiman-Kotler
- Hospital for Sick Children, Cell Biology and Developmental and Stem Cell Biology programs, University of Toronto, Ontario M5G 0A4, Canada; Department of Biochemistry, University of Toronto, Ontario M5G 0A4, Canada
| | - Kathryn Harris
- Department of Cell and System Biology, University of Toronto, Ontario M5G 0A4, Canada
| | - Konstantin G Iliadi
- Hospital for Sick Children, Cell Biology and Developmental and Stem Cell Biology programs, University of Toronto, Ontario M5G 0A4, Canada
| | - Avinash Persaud
- Hospital for Sick Children, Cell Biology and Developmental and Stem Cell Biology programs, University of Toronto, Ontario M5G 0A4, Canada
| | - Yvonne Zhong
- Hospital for Sick Children, Cell Biology and Developmental and Stem Cell Biology programs, University of Toronto, Ontario M5G 0A4, Canada; Department of Biochemistry, University of Toronto, Ontario M5G 0A4, Canada
| | - Yi Zhang
- Department of Gastrointestinal Surgery, Jilin University, Changchun 130033, China
| | - Xuedong Fang
- Department of Gastrointestinal Surgery, Jilin University, Changchun 130033, China
| | - Gabrielle L Boulianne
- Hospital for Sick Children, Cell Biology and Developmental and Stem Cell Biology programs, University of Toronto, Ontario M5G 0A4, Canada; Department of Molecular Genetics, University of Toronto, Ontario M5G 0A4, Canada
| | - Bryan Stewart
- Department of Cell and System Biology, University of Toronto, Ontario M5G 0A4, Canada
| | - Daniela Rotin
- Hospital for Sick Children, Cell Biology and Developmental and Stem Cell Biology programs, University of Toronto, Ontario M5G 0A4, Canada; Department of Biochemistry, University of Toronto, Ontario M5G 0A4, Canada.
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11
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Persaud A, Cormerais Y, Pouyssegur J, Rotin D. Dynamin inhibitors block activation of mTORC1 by amino acids independently of dynamin. J Cell Sci 2018; 131:jcs.211755. [PMID: 29150487 DOI: 10.1242/jcs.211755] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 11/08/2017] [Indexed: 02/04/2023] Open
Abstract
mTORC1 plays a crucial role in protein synthesis and cell proliferation and growth. It is activated by growth factors and amino acids, including essential amino acids (EAAs), such as leucine; Leu enters cells via the Leu transporter LAT1-4F2hc (also known as SLC7A5-SLC3A2) and potentially via endocytosis. Here, we investigated the contribution of the different routes of Leu entry into cells to mTORC1 activation using pharmacological inhibitors and cells that lack LAT1 or dynamin-1, -2 and -3. Our results show that LAT1 is the major route of Leu entry into cells and mTORC1 activation (∼70%), whereas dynamin-dependent endocytosis and macropinocytosis contribute minimally to both (5-15%). However, macropinocytosis contributes significantly (∼40%) to activation of mTORC1 by other EAAs. Surprisingly, the dynamin inhibitors dynasore and Dyngo 4A, which minimally inhibited Leu uptake, abolished mTORC1 activation independently of dynamin. Instead, dynasore inhibited RagA binding to Raptor, reduced mTORC1 recruitment to the lysosome, and inhibited Akt activation and TSC2-S939 phosphorylation; this resulted in inhibition of Rheb and mTORC1 activity. Our results suggest that these commonly used inhibitors of dynamin and endocytosis are potent suppressors of mTORC1 activation via off-target effects and not via dynamin inhibition.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Avinash Persaud
- Program in Cell Biology, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, Toronto, Ontario, Canada, M5G 0A4
| | - Yann Cormerais
- Medical Biology Department, Centre Scientifique de Monaco (CSM), 98000 Monaco
| | - Jacques Pouyssegur
- Medical Biology Department, Centre Scientifique de Monaco (CSM), 98000 Monaco.,Université Côte d'Azur, IRCAN, CNRS, Inserm, Centre A Lacassagne, Nice 06189, France
| | - Daniela Rotin
- Program in Cell Biology, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, Toronto, Ontario, Canada, M5G 0A4
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12
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Crosby JR, Zhao C, Jiang C, Bai D, Katz M, Greenlee S, Kawabe H, McCaleb M, Rotin D, Guo S, Monia BP. Inhaled ENaC antisense oligonucleotide ameliorates cystic fibrosis-like lung disease in mice. J Cyst Fibros 2017; 16:671-680. [PMID: 28539224 DOI: 10.1016/j.jcf.2017.05.003] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 04/26/2017] [Accepted: 05/08/2017] [Indexed: 01/19/2023]
Abstract
BACKGROUND Epithelial sodium channel (ENaC, Scnn1) hyperactivity in the lung leads to airway surface dehydration and mucus accumulation in cystic fibrosis (CF) patients and in mice with CF-like lung disease. METHODS We identified several potent ENaC specific antisense oligonucleotides (ASOs) and tested them by inhalation in mouse models of CF-like lung disease. RESULTS The inhaled ASOs distributed into lung airway epithelial cells and decreased ENaC expression by inducing RNase H1-dependent degradation of the targeted Scnn1a mRNA. Aerosol delivered ENaC ASO down-regulated mucus marker expression and ameliorated goblet cell metaplasia, inflammation, and airway hyper-responsiveness. Lack of systemic activity of ASOs delivered via the aerosol route ensures the safety of this approach. CONCLUSIONS Our results demonstrate that antisense inhibition of ENaC in airway epithelial cells could be an effective and safe approach for the prevention and reversal of lung symptoms in CF and potentially other inflammatory diseases of the lung.
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Affiliation(s)
- Jeff R Crosby
- Ionis Pharmaceuticals, 2855 Gazelle Court, Carlsbad, CA 92010, USA.
| | - Chenguang Zhao
- Ionis Pharmaceuticals, 2855 Gazelle Court, Carlsbad, CA 92010, USA
| | - Chong Jiang
- The Hospital for Sick Children, 686 Bay Street, Toronto, Ontario M5G 0A4, Canada
| | - Dong Bai
- Ionis Pharmaceuticals, 2855 Gazelle Court, Carlsbad, CA 92010, USA
| | - Melanie Katz
- Ionis Pharmaceuticals, 2855 Gazelle Court, Carlsbad, CA 92010, USA
| | - Sarah Greenlee
- Ionis Pharmaceuticals, 2855 Gazelle Court, Carlsbad, CA 92010, USA
| | - Hiroshi Kawabe
- Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Michael McCaleb
- Ionis Pharmaceuticals, 2855 Gazelle Court, Carlsbad, CA 92010, USA
| | - Daniela Rotin
- The Hospital for Sick Children, 686 Bay Street, Toronto, Ontario M5G 0A4, Canada
| | - Shuling Guo
- Ionis Pharmaceuticals, 2855 Gazelle Court, Carlsbad, CA 92010, USA
| | - Brett P Monia
- Ionis Pharmaceuticals, 2855 Gazelle Court, Carlsbad, CA 92010, USA
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13
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Jiang C, Kawabe H, Rotin D. The Ubiquitin Ligase Nedd4L Regulates the Na/K/2Cl Co-transporter NKCC1/SLC12A2 in the Colon. J Biol Chem 2017; 292:3137-3145. [PMID: 28087701 DOI: 10.1074/jbc.m116.770065] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 01/03/2017] [Indexed: 01/06/2023] Open
Abstract
The ubiquitin ligase Nedd4-like (Nedd4L, or Nedd4-2) binds to and regulates stability of the epithelial Na+ channel (ENaC) in salt-absorbing epithelia in the kidney, lung, and other tissues. Its role in the distal colon, which also absorbs salt and fluid and expresses ENaC, is unknown. Using a conditional knock-out approach to knock out Nedd4L in mice intestinal epithelium (Nedd4Lf/f ;Vil-CreERT2 ) we show here that Nedd4L depletion leads to a higher steady-state short circuit current (Isc) in mouse distal colon tissue relative to controls. This higher Isc was partially reduced by the addition of apical amiloride and strongly reduced by basolateral bumetanide as well as by depletion of basolateral Cl-, suggesting that Na+/K+/2Cl- (NKCC1/SLC12A2) co-transporter and ENaC are targets of Nedd4L in the colon. In accordance, NKCC1 (and γENaC) protein abundance in the colon of the Nedd4L knock-out animals was increased, indicating that Nedd4L normally suppresses these proteins. However, we did not observe co-immunoprecipitation between Nedd4L and NKCC1, suggesting that Nedd4L indirectly suppresses NKCC1 expression. Low salt diet resulted in a strong increase in β and γ (but not α) ENaC mRNA and protein expression and ENaC activity. Although salt restriction also increased NKCC1 protein and mRNA abundance, it did not lead to its elevated activity (Isc). These results identify NKCC1 as a novel target for Nedd4L-mediated down-regulation in vivo, which modulates ion and fluid transport in the distal colon together with ENaC.
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Affiliation(s)
- Chong Jiang
- Hospital for Sick Children and University of Toronto, Toronto, Ontario M5G 0A4, Canada
| | - Hiroshi Kawabe
- Department of Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Hermann-Rein-Strasse 3D, 37075 Goettingen, Germany
| | - Daniela Rotin
- Hospital for Sick Children and University of Toronto, Toronto, Ontario M5G 0A4, Canada.
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14
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Attali I, Tobelaim WS, Persaud A, Motamedchaboki K, Simpson-Lavy KJ, Mashahreh B, Levin-Kravets O, Keren-Kaplan T, Pilzer I, Kupiec M, Wiener R, Wolf DA, Rotin D, Prag G. Ubiquitylation-dependent oligomerization regulates activity of Nedd4 ligases. EMBO J 2017; 36:425-440. [PMID: 28069708 DOI: 10.15252/embj.201694314] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Revised: 11/25/2016] [Accepted: 12/06/2016] [Indexed: 11/09/2022] Open
Abstract
Ubiquitylation controls protein function and degradation. Therefore, ubiquitin ligases need to be tightly controlled. We discovered an evolutionarily conserved allosteric restraint mechanism for Nedd4 ligases and demonstrated its function with diverse substrates: the yeast soluble proteins Rpn10 and Rvs167, and the human receptor tyrosine kinase FGFR1 and cardiac IKS potassium channel. We found that a potential trimerization interface is structurally blocked by the HECT domain α1-helix, which further undergoes ubiquitylation on a conserved lysine residue. Genetic, bioinformatics, biochemical and biophysical data show that attraction between this α1-conjugated ubiquitin and the HECT ubiquitin-binding patch pulls the α1-helix out of the interface, thereby promoting trimerization. Strikingly, trimerization renders the ligase inactive. Arginine substitution of the ubiquitylated lysine impairs this inactivation mechanism and results in unrestrained FGFR1 ubiquitylation in cells. Similarly, electrophysiological data and TIRF microscopy show that NEDD4 unrestrained mutant constitutively downregulates the IKS channel, thus confirming the functional importance of E3-ligase autoinhibition.
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Affiliation(s)
- Ilan Attali
- Department of Biochemistry and Molecular Biology, the George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - William Sam Tobelaim
- Department of Physiology & Pharmacology, Sackler Tel Aviv University, Tel Aviv, Israel
| | - Avinash Persaud
- Cell Biology Program, The Hospital for Sick Children and Biochemistry Department, University of Toronto, Toronto, ON, Canada
| | - Khatereh Motamedchaboki
- Tumor Initiation & Maintenance Program and NCI Cancer Centre Proteomics Facility, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Kobi J Simpson-Lavy
- Department of Molecular Microbiology and Biotechnology, the George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Bayan Mashahreh
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - Olga Levin-Kravets
- Department of Biochemistry and Molecular Biology, the George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Tal Keren-Kaplan
- Department of Biochemistry and Molecular Biology, the George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Inbar Pilzer
- Department of Biochemistry and Molecular Biology, the George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Martin Kupiec
- Department of Molecular Microbiology and Biotechnology, the George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Reuven Wiener
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - Dieter A Wolf
- Tumor Initiation & Maintenance Program and NCI Cancer Centre Proteomics Facility, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA.,School of Pharmaceutical Sciences, Xiamen University, Xiamen, China
| | - Daniela Rotin
- Cell Biology Program, The Hospital for Sick Children and Biochemistry Department, University of Toronto, Toronto, ON, Canada
| | - Gali Prag
- Department of Biochemistry and Molecular Biology, the George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel .,Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
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15
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Zhang W, Wu KP, Sartori MA, Kamadurai HB, Ordureau A, Jiang C, Mercredi PY, Murchie R, Hu J, Persaud A, Mukherjee M, Li N, Doye A, Walker JR, Sheng Y, Hao Z, Li Y, Brown KR, Lemichez E, Chen J, Tong Y, Harper JW, Moffat J, Rotin D, Schulman BA, Sidhu SS. System-Wide Modulation of HECT E3 Ligases with Selective Ubiquitin Variant Probes. Mol Cell 2016; 62:121-36. [PMID: 26949039 DOI: 10.1016/j.molcel.2016.02.005] [Citation(s) in RCA: 124] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 01/23/2016] [Accepted: 02/03/2016] [Indexed: 11/20/2022]
Abstract
HECT-family E3 ligases ubiquitinate protein substrates to control virtually every eukaryotic process and are misregulated in numerous diseases. Nonetheless, understanding of HECT E3s is limited by a paucity of selective and potent modulators. To overcome this challenge, we systematically developed ubiquitin variants (UbVs) that inhibit or activate HECT E3s. Structural analysis of 6 HECT-UbV complexes revealed UbV inhibitors hijacking the E2-binding site and activators occupying a ubiquitin-binding exosite. Furthermore, UbVs unearthed distinct regulation mechanisms among NEDD4 subfamily HECTs and proved useful for modulating therapeutically relevant targets of HECT E3s in cells and intestinal organoids, and in a genetic screen that identified a role for NEDD4L in regulating cell migration. Our work demonstrates versatility of UbVs for modulating activity across an E3 family, defines mechanisms and provides a toolkit for probing functions of HECT E3s, and establishes a general strategy for systematic development of modulators targeting families of signaling proteins.
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Affiliation(s)
- Wei Zhang
- Donnelly Centre for Cellular and Biomolecular Research, Banting and Best Department of Medical Research, University of Toronto, 160 College Street, Toronto, ON M5S3E1, Canada
| | - Kuen-Phon Wu
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Maria A Sartori
- Donnelly Centre for Cellular and Biomolecular Research, Banting and Best Department of Medical Research, University of Toronto, 160 College Street, Toronto, ON M5S3E1, Canada
| | - Hari B Kamadurai
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Alban Ordureau
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Chong Jiang
- Program in Cell Biology, Hospital for Sick Children, and Department of Biochemistry, University of Toronto, Toronto, ON M5G 0A4, Canada
| | - Peter Y Mercredi
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Ryan Murchie
- Program in Cell Biology, Hospital for Sick Children, and Department of Biochemistry, University of Toronto, Toronto, ON M5G 0A4, Canada
| | - Jicheng Hu
- Structural Genomics Consortium, University of Toronto, Toronto, ON M5G1L7, Canada
| | - Avinash Persaud
- Program in Cell Biology, Hospital for Sick Children, and Department of Biochemistry, University of Toronto, Toronto, ON M5G 0A4, Canada
| | - Manjeet Mukherjee
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Nan Li
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, Texas 77030, USA
| | - Anne Doye
- Inserm U1065, Centre Méditerranéen de Médecine Moléculaire, C3M, Equipe Labellisée La Ligue Contre Le Cancer, Université de Nice-Sophia Antipolis, 151 Route St Antoine de Ginestière, BP 2 3194, 06204 Nice Cedex, France
| | - John R Walker
- Structural Genomics Consortium, University of Toronto, Toronto, ON M5G1L7, Canada
| | - Yi Sheng
- Department of Biology, York University, Toronto, Ontario M3J1P3, Canada
| | - Zhenyue Hao
- Campbell Family Cancer Research Institute, University Health Network, Toronto, ON M5G2C1, Canada
| | - Yanjun Li
- Structural Genomics Consortium, University of Toronto, Toronto, ON M5G1L7, Canada
| | - Kevin R Brown
- Donnelly Centre for Cellular and Biomolecular Research, Banting and Best Department of Medical Research, University of Toronto, 160 College Street, Toronto, ON M5S3E1, Canada
| | - Emmanuel Lemichez
- Inserm U1065, Centre Méditerranéen de Médecine Moléculaire, C3M, Equipe Labellisée La Ligue Contre Le Cancer, Université de Nice-Sophia Antipolis, 151 Route St Antoine de Ginestière, BP 2 3194, 06204 Nice Cedex, France
| | - Junjie Chen
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, Texas 77030, USA
| | - Yufeng Tong
- Structural Genomics Consortium, University of Toronto, Toronto, ON M5G1L7, Canada; Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON M5G1L7, Canada
| | - J Wade Harper
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Jason Moffat
- Donnelly Centre for Cellular and Biomolecular Research, Banting and Best Department of Medical Research, University of Toronto, 160 College Street, Toronto, ON M5S3E1, Canada; Department of Molecular Genetics, University of Toronto, 1 King's College Cir, Toronto, ON M5S1A8, Canada
| | - Daniela Rotin
- Program in Cell Biology, Hospital for Sick Children, and Department of Biochemistry, University of Toronto, Toronto, ON M5G 0A4, Canada
| | - Brenda A Schulman
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Howard Hughes Medical Institute, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
| | - Sachdev S Sidhu
- Donnelly Centre for Cellular and Biomolecular Research, Banting and Best Department of Medical Research, University of Toronto, 160 College Street, Toronto, ON M5S3E1, Canada; Department of Molecular Genetics, University of Toronto, 1 King's College Cir, Toronto, ON M5S1A8, Canada.
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16
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Safi F, Shteiman-Kotler A, Zhong Y, Iliadi KG, Boulianne GL, Rotin D. Drosophila Nedd4-long reduces Amphiphysin levels in muscles and leads to impaired T-tubule formation. Mol Biol Cell 2016; 27:907-18. [PMID: 26823013 PMCID: PMC4791135 DOI: 10.1091/mbc.e15-06-0420] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 01/15/2016] [Indexed: 12/01/2022] Open
Abstract
An isoform of the fly ubiquitin ligase Nedd4 binds and degrades Amphiphysin, a postsynaptic and transverse tubule (T-tubule) protein in flies, thus impairing T-tubule formation and muscle function. Drosophila Nedd4 (dNedd4) is a HECT ubiquitin ligase with two main splice isoforms: dNedd4-short (dNedd4S) and -long (dNedd4Lo). DNedd4Lo has a unique N-terminus containing a Pro-rich region. We previously showed that whereas dNedd4S promotes neuromuscular synaptogenesis, dNedd4Lo inhibits it and impairs larval locomotion. To delineate the cause of the impaired locomotion, we searched for binding partners to the N-terminal unique region of dNedd4Lo in larval lysates using mass spectrometry and identified Amphiphysin (dAmph). dAmph is a postsynaptic protein containing SH3-BAR domains and regulates muscle transverse tubule (T-tubule) formation in flies. We validated the interaction by coimmunoprecipitation and showed direct binding between dAmph-SH3 domain and dNedd4Lo N-terminus. Accordingly, dNedd4Lo was colocalized with dAmph postsynaptically and at muscle T-tubules. Moreover, expression of dNedd4Lo in muscle during embryonic development led to disappearance of dAmph and impaired T-tubule formation, phenocopying amph-null mutants. This effect was not seen in muscles expressing dNedd4S or a catalytically-inactive dNedd4Lo(C→A). We propose that dNedd4Lo destabilizes dAmph in muscles, leading to impaired T-tubule formation and muscle function.
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Affiliation(s)
- Frozan Safi
- Hospital for Sick Children, Toronto, ON M5G 0A4, Canada Biochemistry Department, University of Toronto, Toronto ON M5S 1A1, Canada
| | - Alina Shteiman-Kotler
- Hospital for Sick Children, Toronto, ON M5G 0A4, Canada Biochemistry Department, University of Toronto, Toronto ON M5S 1A1, Canada
| | - Yunan Zhong
- Hospital for Sick Children, Toronto, ON M5G 0A4, Canada Biochemistry Department, University of Toronto, Toronto ON M5S 1A1, Canada
| | | | - Gabrielle L Boulianne
- Hospital for Sick Children, Toronto, ON M5G 0A4, Canada Molecular Genetics Department, University of Toronto, Toronto ON M5S 1A1, Canada
| | - Daniela Rotin
- Hospital for Sick Children, Toronto, ON M5G 0A4, Canada Biochemistry Department, University of Toronto, Toronto ON M5S 1A1, Canada
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17
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Milkereit R, Persaud A, Vanoaica L, Guetg A, Verrey F, Rotin D. LAPTM4b recruits the LAT1-4F2hc Leu transporter to lysosomes and promotes mTORC1 activation. Nat Commun 2015; 6:7250. [PMID: 25998567 PMCID: PMC4455107 DOI: 10.1038/ncomms8250] [Citation(s) in RCA: 144] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 04/22/2015] [Indexed: 01/01/2023] Open
Abstract
Mammalian target of rapamycin 1 (mTORC1), a master regulator of cellular growth, is activated downstream of growth factors, energy signalling and intracellular essential amino acids (EAAs) such as Leu. mTORC1 activation occurs at the lysosomal membrane, and involves V-ATPase stimulation by intra-lysosomal EAA (inside-out activation), leading to activation of the Ragulator, RagA/B-GTP and mTORC1 via Rheb-GTP. How Leu enters the lysosomes is unknown. Here we identified the lysosomal protein LAPTM4b as a binding partner for the Leu transporter, LAT1-4F2hc (SLC7A5-SLAC3A2). We show that LAPTM4b recruits LAT1-4F2hc to lysosomes, leading to uptake of Leu into lysosomes, and is required for mTORC1 activation via V-ATPase following EAA or Leu stimulation. These results demonstrate a functional Leu transporter at the lysosome, and help explain the inside-out lysosomal activation of mTORC1 by Leu/EAA.
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Affiliation(s)
- Ruth Milkereit
- Program in Cell Biology, The Hospital for Sick Children, Biochemistry Department, University of Toronto, Toronto, Ontario M5G 0A4, Canada
| | - Avinash Persaud
- Program in Cell Biology, The Hospital for Sick Children, Biochemistry Department, University of Toronto, Toronto, Ontario M5G 0A4, Canada
| | - Liviu Vanoaica
- Center for Integrative Human Physiology (ZIHP) and NCCR Kidney, Institute of Physiology, University of Zurich, Zurich 8057, Switzerland
| | - Adriano Guetg
- Center for Integrative Human Physiology (ZIHP) and NCCR Kidney, Institute of Physiology, University of Zurich, Zurich 8057, Switzerland
| | - Francois Verrey
- Center for Integrative Human Physiology (ZIHP) and NCCR Kidney, Institute of Physiology, University of Zurich, Zurich 8057, Switzerland
| | - Daniela Rotin
- Program in Cell Biology, The Hospital for Sick Children, Biochemistry Department, University of Toronto, Toronto, Ontario M5G 0A4, Canada
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18
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Trzcińska-Daneluti AM, Chen A, Nguyen L, Murchie R, Jiang C, Moffat J, Pelletier L, Rotin D. RNA Interference Screen to Identify Kinases That Suppress Rescue of ΔF508-CFTR. Mol Cell Proteomics 2015; 14:1569-83. [PMID: 25825526 DOI: 10.1074/mcp.m114.046375] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Indexed: 01/08/2023] Open
Abstract
Cystic Fibrosis (CF) is an autosomal recessive disorder caused by mutations in the gene encoding the Cystic fibrosis transmembrane conductance regulator (CFTR). ΔF508-CFTR, the most common disease-causing CF mutant, exhibits folding and trafficking defects and is retained in the endoplasmic reticulum, where it is targeted for proteasomal degradation. To identify signaling pathways involved in ΔF508-CFTR rescue, we screened a library of endoribonuclease-prepared short interfering RNAs (esiRNAs) that target ∼750 different kinases and associated signaling proteins. We identified 20 novel suppressors of ΔF508-CFTR maturation, including the FGFR1. These were subsequently validated by measuring channel activity by the YFP halide-sensitive assay following shRNA-mediated knockdown, immunoblotting for the mature (band C) ΔF508-CFTR and measuring the amount of surface ΔF508-CFTR by ELISA. The role of FGFR signaling on ΔF508-CFTR trafficking was further elucidated by knocking down FGFRs and their downstream signaling proteins: Erk1/2, Akt, PLCγ-1, and FRS2. Interestingly, inhibition of FGFR1 with SU5402 administered to intestinal organoids (mini-guts) generated from the ileum of ΔF508-CFTR homozygous mice resulted in a robust ΔF508-CFTR rescue. Moreover, combination of SU5402 and VX-809 treatments in cells led to an additive enhancement of ΔF508-CFTR rescue, suggesting these compounds operate by different mechanisms. Chaperone array analysis on human bronchial epithelial cells harvested from ΔF508/ΔF508-CFTR transplant patients treated with SU5402 identified altered expression of several chaperones, an effect validated by their overexpression or knockdown experiments. We propose that FGFR signaling regulates specific chaperones that control ΔF508-CFTR maturation, and suggest that FGFRs may serve as important targets for therapeutic intervention for the treatment of CF.
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Affiliation(s)
- Agata M Trzcińska-Daneluti
- From the ‡Program in Cell Biology, The Hospital for Sick Children, Toronto, and Biochemistry Department, University of Toronto; PGCRL, 19-9715, 686 Bay St., Toronto, Ont., Canada, M5G 0A4
| | - Anthony Chen
- From the ‡Program in Cell Biology, The Hospital for Sick Children, Toronto, and Biochemistry Department, University of Toronto; PGCRL, 19-9715, 686 Bay St., Toronto, Ont., Canada, M5G 0A4
| | - Leo Nguyen
- From the ‡Program in Cell Biology, The Hospital for Sick Children, Toronto, and Biochemistry Department, University of Toronto; PGCRL, 19-9715, 686 Bay St., Toronto, Ont., Canada, M5G 0A4
| | - Ryan Murchie
- From the ‡Program in Cell Biology, The Hospital for Sick Children, Toronto, and Biochemistry Department, University of Toronto; PGCRL, 19-9715, 686 Bay St., Toronto, Ont., Canada, M5G 0A4
| | - Chong Jiang
- From the ‡Program in Cell Biology, The Hospital for Sick Children, Toronto, and Biochemistry Department, University of Toronto; PGCRL, 19-9715, 686 Bay St., Toronto, Ont., Canada, M5G 0A4
| | | | | | - Daniela Rotin
- From the ‡Program in Cell Biology, The Hospital for Sick Children, Toronto, and Biochemistry Department, University of Toronto; PGCRL, 19-9715, 686 Bay St., Toronto, Ont., Canada, M5G 0A4
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19
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Fang NN, Chan GT, Zhu M, Comyn SA, Persaud A, Deshaies RJ, Rotin D, Gsponer J, Mayor T. Rsp5/Nedd4 is the main ubiquitin ligase that targets cytosolic misfolded proteins following heat stress. Nat Cell Biol 2014; 16:1227-37. [PMID: 25344756 PMCID: PMC5224936 DOI: 10.1038/ncb3054] [Citation(s) in RCA: 136] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 09/17/2014] [Indexed: 12/14/2022]
Abstract
The heat-shock response is a complex cellular program that induces major changes in protein translation, folding and degradation to alleviate toxicity caused by protein misfolding. Although heat shock has been widely used to study proteostasis, it remained unclear how misfolded proteins are targeted for proteolysis in these conditions. We found that Rsp5 and its mammalian homologue Nedd4 are important E3 ligases responsible for the increased ubiquitylation induced by heat stress. We determined that Rsp5 ubiquitylates mainly cytosolic misfolded proteins upon heat shock for proteasome degradation. We found that ubiquitylation of heat-induced substrates requires the Hsp40 co-chaperone Ydj1 that is further associated with Rsp5 upon heat shock. In addition, ubiquitylation is also promoted by PY Rsp5-binding motifs found primarily in the structured regions of stress-induced substrates, which can act as heat-induced degrons. Our results support a bipartite recognition mechanism combining direct and chaperone-dependent ubiquitylation of misfolded cytosolic proteins by Rsp5.
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Affiliation(s)
- Nancy N Fang
- Department of Biochemistry and Molecular Biology, Centre for High-Throughput Biology, University of British Columbia, 2125 East Mall Vancouver, British Columbia V6T1Z4, Canada
| | - Gerard T Chan
- Department of Biochemistry and Molecular Biology, Centre for High-Throughput Biology, University of British Columbia, 2125 East Mall Vancouver, British Columbia V6T1Z4, Canada
| | - Mang Zhu
- Department of Biochemistry and Molecular Biology, Centre for High-Throughput Biology, University of British Columbia, 2125 East Mall Vancouver, British Columbia V6T1Z4, Canada
| | - Sophie A Comyn
- Department of Biochemistry and Molecular Biology, Centre for High-Throughput Biology, University of British Columbia, 2125 East Mall Vancouver, British Columbia V6T1Z4, Canada
| | - Avinash Persaud
- Program in Cell Biology, Hospital for Sick Children, and Biochemistry Department, University of Toronto, Toronto, Ontario M5G 0A4, Canada
| | - Raymond J Deshaies
- Howard Hughes Medical Institute, Division of Biology and Biological Engineering, 114-96 Caltech, 1200 E. California Boulevard Pasadena, California 91125, USA
| | - Daniela Rotin
- Program in Cell Biology, Hospital for Sick Children, and Biochemistry Department, University of Toronto, Toronto, Ontario M5G 0A4, Canada
| | - Joerg Gsponer
- Department of Biochemistry and Molecular Biology, Centre for High-Throughput Biology, University of British Columbia, 2125 East Mall Vancouver, British Columbia V6T1Z4, Canada
| | - Thibault Mayor
- Department of Biochemistry and Molecular Biology, Centre for High-Throughput Biology, University of British Columbia, 2125 East Mall Vancouver, British Columbia V6T1Z4, Canada
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20
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Persaud A, Alberts P, Mari S, Tong J, Murchie R, Maspero E, Safi F, Moran MF, Polo S, Rotin D. Tyrosine phosphorylation of NEDD4 activates its ubiquitin ligase activity. Sci Signal 2014; 7:ra95. [PMID: 25292214 DOI: 10.1126/scisignal.2005290] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Ligand binding to the receptor tyrosine kinase fibroblast growth factor (FGF) receptor 1 (FGFR1) causes dimerization and activation by transphosphorylation of tyrosine residues in the kinase domain. FGFR1 is ubiquitylated by the E3 ligase NEDD4 (also known as NEDD4-1), which promotes FGFR1 internalization and degradation. Although phosphorylation of FGFR1 is required for NEDD4-dependent endocytosis, NEDD4 directly binds to a nonphosphorylated region of FGFR1. We found that activation of FGFR1 led to activation of c-Src kinase-dependent tyrosine phosphorylation of NEDD4, enhancing the ubiquitin ligase activity of NEDD4. Using mass spectrometry, we identified several FGF-dependent phosphorylated tyrosines in NEDD4, including Tyr(43) in the C2 domain and Tyr(585) in the HECT domain. Mutating these tyrosines to phenylalanine to prevent phosphorylation inhibited FGF-dependent NEDD4 activity and FGFR1 endocytosis and enhanced cell proliferation. Mutating the tyrosines to glutamic acid to mimic phosphorylation enhanced NEDD4 activity. Moreover, the NEDD4 C2 domain bound the HECT domain, and the presence of phosphomimetic mutations inhibited this interaction, suggesting that phosphorylation of NEDD4 relieves an inhibitory intra- or intermolecular interaction. Accordingly, activation of FGFR1 was not required for activation of NEDD4 that lacked its C2 domain. Activation of c-Src by epidermal growth factor (EGF) also promoted tyrosine phosphorylation and enhanced the activity of NEDD4. Thus, we identified a feedback mechanism by which receptor tyrosine kinases promote catalytic activation of NEDD4 and that may represent a mechanism of receptor crosstalk.
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Affiliation(s)
- Avinash Persaud
- Cell Biology Program, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, 686 Bay Street, Toronto, Ontario M5G 0A4, Canada
| | - Philipp Alberts
- Cell Biology Program, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, 686 Bay Street, Toronto, Ontario M5G 0A4, Canada
| | - Sara Mari
- IFOM, Fondazione Istituto FIRC di Oncologia Molecolare, Via Adamello 16, Milan 20139, Italy
| | - Jiefei Tong
- Molecular Structure and Function Program, The Hospital for Sick Children, and Molecular Genetics Department, University of Toronto, Toronto, Ontario M5G 0A4, Canada
| | - Ryan Murchie
- Cell Biology Program, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, 686 Bay Street, Toronto, Ontario M5G 0A4, Canada
| | - Elena Maspero
- IFOM, Fondazione Istituto FIRC di Oncologia Molecolare, Via Adamello 16, Milan 20139, Italy
| | - Frozan Safi
- Cell Biology Program, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, 686 Bay Street, Toronto, Ontario M5G 0A4, Canada
| | - Michael F Moran
- Molecular Structure and Function Program, The Hospital for Sick Children, and Molecular Genetics Department, University of Toronto, Toronto, Ontario M5G 0A4, Canada
| | - Simona Polo
- IFOM, Fondazione Istituto FIRC di Oncologia Molecolare, Via Adamello 16, Milan 20139, Italy. Dipartimento Scienze della Salute, Universita degli Studi di Milano, Via di Rudini 8, Milan 20142, Italy
| | - Daniela Rotin
- Cell Biology Program, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, 686 Bay Street, Toronto, Ontario M5G 0A4, Canada.
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21
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Carlile GW, Robert R, Goepp J, Matthes E, Liao J, Kus B, Macknight SD, Rotin D, Hanrahan JW, Thomas DY. Ibuprofen rescues mutant cystic fibrosis transmembrane conductance regulator trafficking. J Cyst Fibros 2014; 14:16-25. [PMID: 24974227 DOI: 10.1016/j.jcf.2014.06.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 05/27/2014] [Accepted: 06/01/2014] [Indexed: 11/30/2022]
Abstract
BACKGROUND Small molecules as shown by VX809 can rescue the mislocalization of F508del-CFTR. The aim of this study was to identify correctors with a clinical history and their targets of action. METHODS CFTR correctors were screened using two F508del-CFTR expressing cell based HTS assays. Electrophysiological studies using CFBE41o(-) and HBE cells and in-vivo mouse assays confirmed CFTR rescue. The target of action was attained using pharmacological inhibitors and siRNA to specific genes. RESULTS Ibuprofen was identified as a CFTR corrector. Ibuprofen treatment of polarized CFBE41o(-) monolayers increased the short-circuit current (Isc) response to stimulation. In vivo CF mice treatment with ibuprofen restored the CFTR trafficking. SiRNA knock down of cyclooxygenase expression caused partial F508del-CFTR correction. CONCLUSION These studies show that ibuprofen is a CFTR corrector and that it causes correction by COX-1 inhibition. Hence ibuprofen may be suitable to be part of a future CF combination therapy.
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Affiliation(s)
- Graeme W Carlile
- Cystic Fibrosis Translational Research Center, Dept. of Biochemistry, McGill University, Montreal, Quebec H3G1Y6, Canada.
| | - Renaud Robert
- Cystic Fibrosis Translational Research Center, Dept. of Physiology, McGill University, Montreal, Quebec H3G1Y6, Canada
| | - Julie Goepp
- Cystic Fibrosis Translational Research Center, Dept. of Physiology, McGill University, Montreal, Quebec H3G1Y6, Canada
| | - Elizabeth Matthes
- Cystic Fibrosis Translational Research Center, Dept. of Physiology, McGill University, Montreal, Quebec H3G1Y6, Canada
| | - Jie Liao
- Cystic Fibrosis Translational Research Center, Dept. of Physiology, McGill University, Montreal, Quebec H3G1Y6, Canada
| | - Bart Kus
- Hospital for Sick Children, Dept. of Biochemistry, University of Toronto, Ontario M5G 1X8, Canada
| | - Sean D Macknight
- Cystic Fibrosis Translational Research Center, Dept. of Biochemistry, McGill University, Montreal, Quebec H3G1Y6, Canada
| | - Daniela Rotin
- Hospital for Sick Children, Dept. of Biochemistry, University of Toronto, Ontario M5G 1X8, Canada
| | - John W Hanrahan
- Cystic Fibrosis Translational Research Center, Dept. of Physiology, McGill University, Montreal, Quebec H3G1Y6, Canada
| | - David Y Thomas
- Cystic Fibrosis Translational Research Center, Dept. of Biochemistry, McGill University, Montreal, Quebec H3G1Y6, Canada
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22
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23
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Beck J, Maerki S, Posch M, Metzger T, Persaud A, Scheel H, Hofmann K, Rotin D, Pedrioli P, Swedlow JR, Peter M, Sumara I. Ubiquitylation-dependent localization of PLK1 in mitosis. Nat Cell Biol 2013; 15:430-9. [PMID: 23455478 PMCID: PMC7116173 DOI: 10.1038/ncb2695] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Accepted: 01/18/2013] [Indexed: 11/09/2022]
Abstract
Polo-like kinase 1 (PLK1) critically regulates mitosis through its dynamic localization to kinetochores, centrosomes and the midzone. The polo-box domain (PBD) and activity of PLK1 mediate its recruitment to mitotic structures, but the mechanisms regulating PLK1 dynamics remain poorly understood. Here, we identify PLK1 as a target of the cullin 3 (CUL3)-based E3 ubiquitin ligase, containing the BTB adaptor KLHL22, which regulates chromosome alignment and PLK1 kinetochore localization but not PLK1 stability. In the absence of KLHL22, PLK1 accumulates on kinetochores, resulting in activation of the spindle assembly checkpoint (SAC). CUL3-KLHL22 ubiquitylates Lys 492, located within the PBD, leading to PLK1 dissociation from kinetochore phosphoreceptors. Expression of a non-ubiquitylatable PLK1-K492R mutant phenocopies inactivation of CUL3-KLHL22. KLHL22 associates with the mitotic spindle and its interaction with PLK1 increases on chromosome bi-orientation. Our data suggest that CUL3-KLHL22-mediated ubiquitylation signals degradation-independent removal of PLK1 from kinetochores and SAC satisfaction, which are required for faithful mitosis.
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MESH Headings
- Adaptor Proteins, Signal Transducing/antagonists & inhibitors
- Adaptor Proteins, Signal Transducing/genetics
- Adaptor Proteins, Signal Transducing/metabolism
- Amino Acid Sequence
- Blotting, Western
- Cell Cycle Proteins/antagonists & inhibitors
- Cell Cycle Proteins/genetics
- Cell Cycle Proteins/metabolism
- Centrosome/metabolism
- Chromosomes, Human/genetics
- Cullin Proteins/antagonists & inhibitors
- Cullin Proteins/genetics
- Cullin Proteins/metabolism
- HeLa Cells
- Humans
- Immunoprecipitation
- Kinetochores/metabolism
- Microscopy, Fluorescence
- Microtubules/metabolism
- Mitosis/physiology
- Molecular Sequence Data
- Phosphorylation
- Protein Array Analysis
- Protein Serine-Threonine Kinases/antagonists & inhibitors
- Protein Serine-Threonine Kinases/genetics
- Protein Serine-Threonine Kinases/metabolism
- Proto-Oncogene Proteins/antagonists & inhibitors
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins/metabolism
- RNA, Messenger/genetics
- RNA, Small Interfering/genetics
- Sequence Homology, Amino Acid
- Signal Transduction
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
- Spindle Apparatus/metabolism
- Ubiquitin/metabolism
- Ubiquitination
- Polo-Like Kinase 1
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Affiliation(s)
- Jochen Beck
- Institute of Biochemistry, ETH Zurich, 8093 Zurich, Switzerland
| | - Sarah Maerki
- Institute of Biochemistry, ETH Zurich, 8093 Zurich, Switzerland
| | - Markus Posch
- Wellcome Trust Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee, Scotland
| | - Thibaud Metzger
- Institute of Genetics and Molecular and Cellular Biology (IGBMC), Illkirch, France
| | | | | | - Kay Hofmann
- Institute for Genetics, University of Cologne, Cologne, Germany
| | | | | | - Jason R. Swedlow
- Wellcome Trust Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee, Scotland
| | - Matthias Peter
- Institute of Biochemistry, ETH Zurich, 8093 Zurich, Switzerland
| | - Izabela Sumara
- Institute of Biochemistry, ETH Zurich, 8093 Zurich, Switzerland
- Institute of Genetics and Molecular and Cellular Biology (IGBMC), Illkirch, France
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24
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Ernst A, Avvakumov G, Tong J, Fan Y, Zhao Y, Alberts P, Persaud A, Walker JR, Neculai AM, Neculai D, Vorobyov A, Garg P, Beatty L, Chan PK, Juang YC, Landry MC, Yeh C, Zeqiraj E, Karamboulas K, Allali-Hassani A, Vedadi M, Tyers M, Moffat J, Sicheri F, Pelletier L, Durocher D, Raught B, Rotin D, Yang J, Moran MF, Dhe-Paganon S, Sidhu SS. A strategy for modulation of enzymes in the ubiquitin system. Science 2013; 339:590-5. [PMID: 23287719 DOI: 10.1126/science.1230161] [Citation(s) in RCA: 224] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The ubiquitin system regulates virtually all aspects of cellular function. We report a method to target the myriad enzymes that govern ubiquitination of protein substrates. We used massively diverse combinatorial libraries of ubiquitin variants to develop inhibitors of four deubiquitinases (DUBs) and analyzed the DUB-inhibitor complexes with crystallography. We extended the selection strategy to the ubiquitin conjugating (E2) and ubiquitin ligase (E3) enzymes and found that ubiquitin variants can also enhance enzyme activity. Last, we showed that ubiquitin variants can bind selectively to ubiquitin-binding domains. Ubiquitin variants exhibit selective function in cells and thus enable orthogonal modulation of specific enzymatic steps in the ubiquitin system.
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Affiliation(s)
- Andreas Ernst
- Terrence Donnelly Center for Cellular and Biomolecular Research, University of Toronto, 160 College Street, Toronto, Ontario, Canada
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25
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Nagpal P, Plant PJ, Correa J, Bain A, Takeda M, Kawabe H, Rotin D, Bain JR, Batt JAE. The ubiquitin ligase Nedd4-1 participates in denervation-induced skeletal muscle atrophy in mice. PLoS One 2012; 7:e46427. [PMID: 23110050 PMCID: PMC3482220 DOI: 10.1371/journal.pone.0046427] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Accepted: 08/29/2012] [Indexed: 11/23/2022] Open
Abstract
Skeletal muscle atrophy is a consequence of muscle inactivity resulting from denervation, unloading and immobility. It accompanies many chronic disease states and also occurs as a pathophysiologic consequence of normal aging. In all these conditions, ubiquitin-dependent proteolysis is a key regulator of the loss of muscle mass, and ubiquitin ligases confer specificity to this process by interacting with, and linking ubiquitin moieties to target substrates through protein∶protein interaction domains. Our previous work suggested that the ubiquitin-protein ligase Nedd4-1 is a potential mediator of skeletal muscle atrophy associated with inactivity (denervation, unloading and immobility). Here we generated a novel tool, the Nedd4-1 skeletal muscle-specific knockout mouse (myoCre;Nedd4-1flox/flox) and subjected it to a well validated model of denervation induced skeletal muscle atrophy. The absence of Nedd4-1 resulted in increased weights and cross-sectional area of type II fast twitch fibres of denervated gastrocnemius muscle compared with wild type littermates controls, at seven and fourteen days following tibial nerve transection. These effects are not mediated by the Nedd4-1 substrates MTMR4, FGFR1 and Notch-1. These results demonstrate that Nedd4-1 plays an important role in mediating denervation-induced skeletal muscle atrophy in vivo.
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MESH Headings
- Animals
- Blotting, Western
- Cells, Cultured
- Endosomal Sorting Complexes Required for Transport/genetics
- Endosomal Sorting Complexes Required for Transport/metabolism
- Female
- Immunohistochemistry
- Male
- Mice
- Mice, Knockout
- Muscle Denervation
- Muscular Atrophy/genetics
- Muscular Atrophy/metabolism
- Myoblasts/cytology
- Myoblasts/metabolism
- Nedd4 Ubiquitin Protein Ligases
- Protein Tyrosine Phosphatases, Non-Receptor/genetics
- Protein Tyrosine Phosphatases, Non-Receptor/metabolism
- Receptor, Fibroblast Growth Factor, Type 1/genetics
- Receptor, Fibroblast Growth Factor, Type 1/metabolism
- Receptor, Notch1/genetics
- Receptor, Notch1/metabolism
- Satellite Cells, Skeletal Muscle/cytology
- Satellite Cells, Skeletal Muscle/metabolism
- Ubiquitin-Protein Ligases/genetics
- Ubiquitin-Protein Ligases/metabolism
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Affiliation(s)
- Preena Nagpal
- Keenan Research Centre of the LiKaShing Knowledge Institute, St Michaels Hospital, Toronto, Ontario, Canada
- Clinical Science Division, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Pamela J. Plant
- Keenan Research Centre of the LiKaShing Knowledge Institute, St Michaels Hospital, Toronto, Ontario, Canada
| | - Judy Correa
- Keenan Research Centre of the LiKaShing Knowledge Institute, St Michaels Hospital, Toronto, Ontario, Canada
| | - Alexandra Bain
- Clinical Science Division, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Michiko Takeda
- Department of Molecular Neurobiology, Max-Planck-Institute of Experimental Medicine, Goettingen, Germany
| | - Hiroshi Kawabe
- Department of Molecular Neurobiology, Max-Planck-Institute of Experimental Medicine, Goettingen, Germany
| | - Daniela Rotin
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - James R. Bain
- Department of Surgery, McMaster University, Hamilton, Ontario, Canada
| | - Jane A. E. Batt
- Keenan Research Centre of the LiKaShing Knowledge Institute, St Michaels Hospital, Toronto, Ontario, Canada
- Clinical Science Division, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- * E-mail:
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26
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Glowacka WK, Alberts P, Ouchida R, Wang JY, Rotin D. LAPTM5 protein is a positive regulator of proinflammatory signaling pathways in macrophages. J Biol Chem 2012; 287:27691-702. [PMID: 22733818 DOI: 10.1074/jbc.m112.355917] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
LAPTM5 (lysosomal-associated protein transmembrane 5) is a protein that is preferentially expressed in immune cells, and it interacts with the Nedd4 family of ubiquitin ligases. Recent studies in T and B cells identified LAPTM5 as a negative regulator of T and B cell receptor levels at the plasma membrane. Here we investigated the function of LAPTM5 in macrophages. We demonstrate that expression of LAPTM5 is required for the secretion of proinflammatory cytokines in response to Toll-like receptor ligands. We also show that RAW264.7 cells knocked down for LAPTM5 or macrophages from LAPTM5(-/-) mice exhibit reduced activation of NF-κB and MAPK signaling pathways mediated by the TNF receptor, as well as multiple pattern recognition receptors in various cellular compartments. TNF stimulation of LAPTM5-deficient macrophages leads to reduced ubiquitination of RIP1 (receptor-interacting protein 1), suggesting a role for LAPTM5 at the receptor-proximate level. Interestingly, we find that macrophages from LAPTM5(-/-) mice display up-regulated levels of A20, a ubiquitin-editing enzyme responsible for deubiquitination of RIP1 and subsequent termination of NF-κB activation. Our studies thus indicate that, in contrast to its negative role in T and B cell activation, LAPTM5 acts as a positive modulator of inflammatory signaling pathways and hence cytokine secretion in macrophages. They also highlight a role for the endosomal/lysosomal system in regulating signaling via cytokine and pattern recognition receptors.
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Affiliation(s)
- Wioletta K Glowacka
- Program in Cell Biology, the Hospital for Sick Children, and Biochemistry Department, University of Toronto, Toronto, Ontario M5G 1L7, Canada
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27
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Abstract
Nedd4-2 is a ubiquitin ligase previously demonstrated to regulate endocytosis and lysosomal degradation of the epithelial Na(+) channel (ENaC) and other ion channels and transporters. Recent studies using Nedd4-2 knockout mice specifically in kidney or lung epithelia has revealed a critical role for this E3 ubiquitin ligase in regulating salt and fluid transport in these tissues/organs and in maintaining homeostasis of body blood pressure. Interestingly, the primary targets for Nedd4-2 may differ in these two organs: in the lung Nedd4-2 targets ENaC, and loss of Nedd4-2 leads to excessive ENaC function and to cystic fibrosis - like lung disease, whereas in the kidney, Nedd4-2 targets the Na(+)/Cl(-) cotransporter (NCC) in addition to targeting ENaC. In accord, loss of Nedd4-2 in the distal nephron leads to increased NCC abundance and function. The aldosterone-responsive kinase, Sgk1, appears to be involved in the regulation of NCC by Nedd4-2 in the kidney, similar to its regulation of ENaC. Collectively, these new findings underscore the physiological importance of Nedd4-2 in regulating epithelial salt and fluid transport and balance.
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Affiliation(s)
- Daniela Rotin
- Program in Cell Biology, The Hospital for Sick Children, Biochemistry Department, University of Toronto Toronto, ON, Canada
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28
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Trzcinska-Daneluti AM, Nguyen L, Jiang C, Fladd C, Uehling D, Prakesch M, Al-awar R, Rotin D. Use of kinase inhibitors to correct ΔF508-CFTR function. Mol Cell Proteomics 2012; 11:745-57. [PMID: 22700489 DOI: 10.1074/mcp.m111.016626] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The most common mutation in cystic fibrosis (CF) is a deletion of Phe at position 508 (ΔF508-CFTR). ΔF508-CFTR is a trafficking mutant that is retained in the ER, unable to reach the plasma membrane. To identify compounds and drugs that rescue this trafficking defect, we screened a kinase inhibitor library enriched for small molecules already in the clinic or in clinical trials for the treatment of cancer and inflammation, using our recently developed high-content screen technology (Trzcinska-Daneluti et al. Mol. Cell. Proteomics 8:780, 2009). The top hits of the screen were further validated by (1) biochemical analysis to demonstrate the presence of mature (Band C) ΔF508-CFTR, (2) flow cytometry to reveal the presence of ΔF508-CFTR at the cell surface, (3) short-circuit current (Isc) analysis in Ussing chambers to show restoration of function of the rescued ΔF508-CFTR in epithelial MDCK cells stably expressing this mutant (including EC(50) determinations), and importantly (4) Isc analysis of Human Bronchial Epithelial (HBE) cells harvested from homozygote ΔF508-CFTR transplant patients. Interestingly, several inhibitors of receptor Tyr kinases (RTKs), such as SU5402 and SU6668 (which target FGFRs, VEGFR, and PDGFR) exhibited strong rescue of ΔF508-CFTR, as did several inhibitors of the Ras/Raf/MEK/ERK or p38 pathways (e.g. (5Z)-7-oxozeaenol). Prominent rescue was also observed by inhibitors of GSK-3β (e.g. GSK-3β Inhibitor II and Kenpaullone). These results identify several kinase inhibitors that can rescue ΔF508-CFTR to various degrees, and suggest that use of compounds or drugs already in the clinic or in clinical trials for other diseases can expedite delivery of treatment for CF patients.
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29
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Zhong Y, Shtineman-Kotler A, Nguyen L, Iliadi KG, Boulianne GL, Rotin D. A splice isoform of DNedd4, DNedd4-long, negatively regulates neuromuscular synaptogenesis and viability in Drosophila. PLoS One 2011; 6:e27007. [PMID: 22110599 PMCID: PMC3215714 DOI: 10.1371/journal.pone.0027007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Accepted: 10/07/2011] [Indexed: 11/29/2022] Open
Abstract
Background Neuromuscular (NM) synaptogenesis is a tightly regulated process. We previously showed that in flies, Drosophila Nedd4 (dNedd4/dNedd4S) is required for proper NM synaptogenesis by promoting endocytosis of commissureless from the muscle surface, a pre-requisite step for muscle innervation. DNedd4 is an E3 ubiquitin ligase comprised of a C2-WW(x3)-Hect domain architecture, which includes several splice isoforms, the most prominent ones are dNedd4-short (dNedd4S) and dNedd4-long (dNedd4Lo). Methodology/Principal Findings We show here that while dNedd4S is essential for NM synaptogenesis, the dNedd4Lo isoform inhibits this process and causes lethality. Our results reveal that unlike dNedd4S, dNedd4Lo cannot rescue the lethality of dNedd4 null (DNedd4T121FS) flies. Moreover, overexpression of UAS-dNedd4Lo specifically in wildtype muscles leads to NM synaptogenesis defects, impaired locomotion and larval lethality. These negative effects of dNedd4Lo are ameliorated by deletion of two regions (N-terminus and Middle region) unique to this isoform, and by inactivating the catalytic activity of dNedd4Lo, suggesting that these unique regions, as well as catalytic activity, are responsible for the inhibitory effects of dNedd4Lo on synaptogenesis. In accord with these findings, we demonstrate by sqRT-PCR an increase in dNedd4S expression relative to the expression of dNedd4Lo during embryonic stages when synaptogenesis takes place. Conclusion/Significance Our studies demonstrate that splice isoforms of the same dNedd4 gene can lead to opposite effects on NM synaptogenesis.
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Affiliation(s)
- Yunan Zhong
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Canada
- Department of Biochemistry, University of Toronto, Toronto, Canada
| | - Alina Shtineman-Kotler
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Canada
- Department of Biochemistry, University of Toronto, Toronto, Canada
| | - Leo Nguyen
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Canada
- Department of Biochemistry, University of Toronto, Toronto, Canada
| | - Konstantin G. Iliadi
- Program in Developmental and Stem Cell Biology, The Hospital for Sick Children, Toronto, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Canada
| | - Gabrielle L. Boulianne
- Program in Developmental and Stem Cell Biology, The Hospital for Sick Children, Toronto, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Canada
| | - Daniela Rotin
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Canada
- Department of Biochemistry, University of Toronto, Toronto, Canada
- * E-mail:
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30
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Persaud A, Alberts P, Hayes M, Guettler S, Clarke I, Sicheri F, Dirks P, Ciruna B, Rotin D. Nedd4-1 binds and ubiquitylates activated FGFR1 to control its endocytosis and function. EMBO J 2011; 30:3259-73. [PMID: 21765395 DOI: 10.1038/emboj.2011.234] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Accepted: 06/20/2011] [Indexed: 01/23/2023] Open
Abstract
Fibroblast growth factor receptor 1 (FGFR1) has critical roles in cellular proliferation and differentiation during animal development and adult homeostasis. Here, we show that human Nedd4 (Nedd4-1), an E3 ubiquitin ligase comprised of a C2 domain, 4 WW domains, and a Hect domain, regulates endocytosis and signalling of FGFR1. Nedd4-1 binds directly to and ubiquitylates activated FGFR1, by interacting primarily via its WW3 domain with a novel non-canonical sequence (non-PY motif) on FGFR1. Deletion of this recognition motif (FGFR1-Δ6) abolishes Nedd4-1 binding and receptor ubiquitylation, and impairs endocytosis of activated receptor, as also observed upon Nedd4-1 knockdown. Accordingly, FGFR1-Δ6, or Nedd4-1 knockdown, exhibits sustained FGF-dependent receptor Tyr phosphorylation and downstream signalling (activation of FRS2α, Akt, Erk1/2, and PLCγ). Expression of FGFR1-Δ6 in human embryonic neural stem cells strongly promotes FGF2-dependent neuronal differentiation. Furthermore, expression of this FGFR1-Δ6 mutant in zebrafish embryos disrupts anterior neuronal patterning (head development), consistent with excessive FGFR1 signalling. These results identify Nedd4-1 as a key regulator of FGFR1 endocytosis and signalling during neuronal differentiation and embryonic development.
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Affiliation(s)
- Avinash Persaud
- Programs in Cell Biology and Developmental and Stem Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
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31
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Zelenkov P, Shevelev I, Potapov A, Golbin D, Konovalov N, Saveljeva T, Nazarenko A, Kuszel Y, Rotin D, Kuzmin S, Loshenov V, Grachev P. 5-ALA-induced PPIX fluorescence in intramedullary tumors. Photodiagnosis Photodyn Ther 2011. [DOI: 10.1016/j.pdpdt.2011.03.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Abstract
Mutation of the protein spartin is a cause of one form of spastic paraplegia. Spartin interacts with ubiquitin ligases of the Nedd4 family, and a recent report in BMC Biology now shows that it acts as an adaptor to recruit and activate the ubiquitin ligase AIP4 onto lipid droplets, leading to the ubiquitination and degradation of droplet-associated proteins. A deficiency of spartin apparently causes lipid droplets to accumulate. See research article: http://www.biomedcentral.com/1741-7007/8/72/
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Affiliation(s)
- Philipp Alberts
- Cell Biology Program, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, Toronto, Ontario, M5G 1L7, Canada.
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33
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Robert R, Carlile GW, Liao J, Balghi H, Lesimple P, Liu N, Kus B, Rotin D, Wilke M, de Jonge HR, Scholte BJ, Thomas DY, Hanrahan JW. Correction of the ΔPhe508 Cystic Fibrosis Transmembrane Conductance Regulator Trafficking Defect by the Bioavailable Compound Glafenine. Mol Pharmacol 2010; 77:922-30. [DOI: 10.1124/mol.109.062679] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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34
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Fouladkou F, Lu C, Jiang C, Zhou L, She Y, Walls JR, Kawabe H, Brose N, Henkelman RM, Huang A, Bruneau BG, Rotin D. The ubiquitin ligase Nedd4-1 is required for heart development and is a suppressor of thrombospondin-1. J Biol Chem 2009; 285:6770-80. [PMID: 20026598 DOI: 10.1074/jbc.m109.082347] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Nedd4 (Nedd4-1) is a Hect domain E3 ubiquitin ligase that also contains a C2 domain and three WW domains. Despite numerous in vitro studies, its biological function in vivo is not well understood. Here we show that disruption of Nedd4-1 in mice (leaving Nedd4-2 intact) caused embryonic lethality at mid gestation, with pronounced heart defects (double-outlet right ventricle and atrioventricular cushion defects) and vasculature abnormalities. Quantitative mass spectrometry and immunoblot analyses of lysates from the wild type and knock-out mouse embryonic fibroblasts to identify Nedd4-1 in vivo targets revealed dramatically increased amounts of thrombospondin-1 (Tsp-1) in the knock-out mouse embryonic fibroblasts and embryos. Tsp-1 is an inhibitor of angiogenesis, and its elevated level was mediated primarily by enhanced transcription. Interestingly, the administration of aspirin (an inhibitor of Tsp-1) to the pregnant heterozygote mothers led to a reduction in Tsp-1 levels and a substantial rescue of the embryonic lethality. These results suggest that Nedd4-1 is a suppressor of Tsp1 and that increased levels of Tsp-1 in the Nedd4-1 knock-out mice may have contributed to the developmental defect observed in the embryos.
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Affiliation(s)
- Fatemeh Fouladkou
- Program in Cell Biology and the Mouse Imaging Centre, The Hospital for Sick Children, Toronto, Ontario M5G 1L7, Canada
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35
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Muise AM, Walters TD, Glowacka WK, Griffiths AM, Ngan BY, Lan H, Xu W, Silverberg MS, Rotin D. Polymorphisms in E-cadherin (CDH1) result in a mis-localised cytoplasmic protein that is associated with Crohn's disease. Gut 2009; 58:1121-7. [PMID: 19398441 DOI: 10.1136/gut.2008.175117] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND Patients with Crohn's disease have defects in intestinal epithelial permeability that are inadequately explained by known inflammatory bowel disease (IBD) susceptibility genes. E-cadherin (CDH1) plays a vital role in maintaining the integrity of the intestinal barrier and its cellular localisation is disrupted in patients with Crohn's disease. AIM To determine if polymorphisms in the CDH1 gene are associated with Crohn's disease and to determine the function associated with these polymorphisms. METHODS The hypothesis was tested using a candidate gene approach using 20 Tag SNPs derived from the HapMap and Crohn's disease trios. Functional studies were carried out using HapMap cell lines and polarised epithelial cell lines (MDCK-1 and Caco2). RESULTS Here we show that CDH1 is associated with Crohn's disease in 327 trios (rs10431923 excess transmission of "TT" genotype; p = 0.0020) and is replicated in the Wellcome Trust Case Control Consortium CD data set (TT risk allele; OR 1.2, p = 0.005). Patients with the Crohn's disease risk haplotype (rs12597188, rs10431923 and rs9935563; GTC allelic frequency 21%; p = 0.000016) exhibited increased E-cadherin cytoplasmic accumulation in their intestinal epithelium which may be explained by the presence of a novel truncated form of E-cadherin. Accordingly, expression of this truncated E-cadherin in cultured polarised epithelial cells resulted in abnormal intracellular accumulation and impaired plasma membrane localisation of both E-cadherin and beta-catenin. CONCLUSION The mis-localisation of E-cadherin and beta-catenin may explain the increased permeability seen in some patients with Crohn's disease. Thus, the polymorphisms identified in CDH1 are important for understanding the pathogenesis of Crohn's disease and point to a defect in barrier defence.
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Affiliation(s)
- A M Muise
- Department of Pediatrics, Division of Gastroenterology, Hepatology, and Nutrition, Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
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36
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Schimmer AD, Malkin D, Zackenhaus E, Kagal A, Klip A, Rotin D, Minden MD, Teitel J. Health care crisis in Gaza. CMAJ 2009; 180:1230. [DOI: 10.1503/cmaj.1090038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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37
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Trzcinska-Daneluti AM, Ly D, Huynh L, Jiang C, Fladd C, Rotin D. High-content functional screen to identify proteins that correct F508del-CFTR function. Mol Cell Proteomics 2008; 8:780-90. [PMID: 19088066 DOI: 10.1074/mcp.m800268-mcp200] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Cystic Fibrosis is caused by mutations in CFTR, with a deletion of a phenylalanine at position 508 (F508del-CFTR) representing the most common mutation. The F508del-CFTR protein exhibits a trafficking defect and is retained in the endoplasmic reticulum. Here we describe the development of a high-content screen based on a functional assay to identify proteins that correct the F508del-CFTR defect. Using a HEK293 MSR GripTite cell line that stably expresses F508del-CFTR, we individually co-expressed approximately 450 unique proteins fused to the Cl(-)-sensitive YFP(H148Q/I152L) mutant. We then tested correction of F508del-CFTR function by the CI(-)/l(-) exchange method following stimulation with forskolin/IBMX/genistein, using quantitative recordings in multiple individual cells with a high-content (high-throughput) Cellomics KSR imaging system. Using this approach, we identified several known and novel proteins that corrected F508del-CFTR function, including STAT1, Endothelin 1, HspA4, SAPK substrate protein 1, AP2M1, LGALS3/galectin-3, Trk-fused gene, Caveolin 2, PAP/REG3alpha, and others. The ability of these correctors to rescue F508del-CFTR trafficking was then validated by demonstrating their enhancement of maturation (appearance of band C) and by cell surface expression of F508del-CFTR bearing HA tag at the ectodomain using confocal microscopy and flow cytometry. These data demonstrate the utility of high-content analyses for identifying proteins that correct mutant CFTR and discover new proteins that stimulate this correction. This assay can also be utilized for RNAi screens to identify inhibitory proteins that block correction of F508del-CFTR, small molecule, and peptide screens.
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Affiliation(s)
- Agata M Trzcinska-Daneluti
- Program in Cell Biology, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, Toronto, Ontario M5G 1L7, Canada
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38
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Abstract
Hypertension is a serious medical problem affecting a large population worldwide. Liddle syndrome is a hereditary form of early onset hypertension caused by mutations in the epithelial Na+ channel (ENaC). The mutated region, called the PY (Pro-Pro-x-Tyr) motif, serves as a binding site for Nedd4-2, an E3 ubiquitin ligase from the HECT family. Nedd4-2 binds the ENaC PY motif via its WW domains, normally leading to ENaC ubiquitylation and endocytosis, reducing the number of active channels at the plasma membrane. In Liddle syndrome, this endocytosis is impaired due to the inability of the mutated PY motif in ENaC to properly bind Nedd4-2. This leads to accumulation of active channels at the cell surface and increased Na+ (and fluid) absorption in the distal nephron, resulting in elevated blood volume and blood pressure. Small molecules/compounds that destabilize cell surface ENaC, or enhance Nedd4-2 activity in the kidney, could potentially serve to alleviate hypertension. Republished from Current BioData's Targeted Proteins database (TPdb; ).
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Affiliation(s)
- Daniela Rotin
- Program in Cell Biology, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, Ontario, M5G 1X8, Canada.
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39
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Abstract
Hypertension is a serious medical problem affecting millions of people worldwide. A key protein regulating blood pressure is the Epithelial Na(+) Channel (ENaC). In accord, loss of function mutations in ENaC (PHA1) cause hypotension, whereas gain of function mutations (Liddle syndrome) result in hypertension. The region mutated in Liddle syndrome, called the PY motif (L/PPxY), serves as a binding site for the ubiquitin ligase Nedd4-2, a C2-WW-Hect E3 ubiquitin ligase. Nedd4-2 binds the ENaC-PY motif via it WW domains, ubiquitylates the channel and targets it for endocytosis, a process impaired in Liddle syndrome due to poor binding of the channel to Nedd4-2. This leads to accumulation of active channels at the cell surface and increased Na(+) (and fluid) absorption in the distal nephron, resulting in elevated blood volume and blood pressure. Compounds that destabilize cell surface ENaC, or enhance Nedd4-2 activity in the kidney, could potentially serve as drug targets for hypertension. In addition, recent discoveries of regulation of activation of ENaC by proteases such as furin, prostasin and elastase, which cleave the extracellular domain of this channel leading to it activation, as well as the identification of inhibitors that block the activity of these proteases, provide further avenues for drug targeting of ENaC and the control of blood pressure.
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Affiliation(s)
- Daniela Rotin
- Program in Cell Biology, The Hospital for Sick Children, TMDT-MaRS, Rm 11-305, 101 College St., Toronto, Ont., Canada.
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40
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Bezsonova I, Bruce MC, Wiesner S, Lin H, Rotin D, Forman-Kay JD. Interactions between the Three CIN85 SH3 Domains and Ubiquitin: Implications for CIN85 Ubiquitination. Biochemistry 2008; 47:8937-49. [DOI: 10.1021/bi800439t] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Irina Bezsonova
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON, Canada M5S 1A8, Program in Molecular Structure and Function and Program in Cell Biology, Hospital for Sick Children, 555 University Avenue, Toronto, ON, Canada M5G 1X8, and Department of Biochemistry, University of Toronto, 1 King’s College Circle, Toronto, ON, Canada M5S 1A8
| | - M. Christine Bruce
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON, Canada M5S 1A8, Program in Molecular Structure and Function and Program in Cell Biology, Hospital for Sick Children, 555 University Avenue, Toronto, ON, Canada M5G 1X8, and Department of Biochemistry, University of Toronto, 1 King’s College Circle, Toronto, ON, Canada M5S 1A8
| | - Silke Wiesner
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON, Canada M5S 1A8, Program in Molecular Structure and Function and Program in Cell Biology, Hospital for Sick Children, 555 University Avenue, Toronto, ON, Canada M5G 1X8, and Department of Biochemistry, University of Toronto, 1 King’s College Circle, Toronto, ON, Canada M5S 1A8
| | - Hong Lin
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON, Canada M5S 1A8, Program in Molecular Structure and Function and Program in Cell Biology, Hospital for Sick Children, 555 University Avenue, Toronto, ON, Canada M5G 1X8, and Department of Biochemistry, University of Toronto, 1 King’s College Circle, Toronto, ON, Canada M5S 1A8
| | - Daniela Rotin
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON, Canada M5S 1A8, Program in Molecular Structure and Function and Program in Cell Biology, Hospital for Sick Children, 555 University Avenue, Toronto, ON, Canada M5G 1X8, and Department of Biochemistry, University of Toronto, 1 King’s College Circle, Toronto, ON, Canada M5S 1A8
| | - Julie D. Forman-Kay
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON, Canada M5S 1A8, Program in Molecular Structure and Function and Program in Cell Biology, Hospital for Sick Children, 555 University Avenue, Toronto, ON, Canada M5G 1X8, and Department of Biochemistry, University of Toronto, 1 King’s College Circle, Toronto, ON, Canada M5S 1A8
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Wiesner S, Ogunjimi AA, Wang HR, Rotin D, Sicheri F, Wrana JL, Forman-Kay JD. Autoinhibition of the HECT-type ubiquitin ligase Smurf2 through its C2 domain. Cell 2007; 130:651-62. [PMID: 17719543 DOI: 10.1016/j.cell.2007.06.050] [Citation(s) in RCA: 218] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2006] [Revised: 05/29/2007] [Accepted: 06/28/2007] [Indexed: 11/19/2022]
Abstract
Ubiquitination of proteins is an abundant modification that controls numerous cellular processes. Many Ubiquitin (Ub) protein ligases (E3s) target both their substrates and themselves for degradation. However, the mechanisms regulating their catalytic activity are largely unknown. The C2-WW-HECT-domain E3 Smurf2 downregulates transforming growth factor-beta (TGF-beta) signaling by targeting itself, the adaptor protein Smad7, and TGF-beta receptor kinases for degradation. Here, we demonstrate that an intramolecular interaction between the C2 and HECT domains inhibits Smurf2 activity, stabilizes Smurf2 levels in cells, and similarly inhibits certain other C2-WW-HECT-domain E3s. Using NMR analysis the C2 domain was shown to bind in the vicinity of the catalytic cysteine, where it interferes with Ub thioester formation. The HECT-binding domain of Smad7, which activates Smurf2, antagonizes this inhibitory interaction. Thus, interactions between C2 and HECT domains autoinhibit a subset of HECT-type E3s to protect them and their substrates from futile degradation in cells.
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Affiliation(s)
- Silke Wiesner
- Hospital for Sick Children, 555 University Avenue, Toronto, Ontario M5G 1X8, Canada.
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Lu C, Pribanic S, Debonneville A, Jiang C, Rotin D. The PY motif of ENaC, mutated in Liddle syndrome, regulates channel internalization, sorting and mobilization from subapical pool. Traffic 2007; 8:1246-64. [PMID: 17605762 DOI: 10.1111/j.1600-0854.2007.00602.x] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The epithelial-Na(+)-channel (alphabetagammaENaC) regulates kidney salt-transport and blood pressure. Each ENaC subunit contains a PY motif (PPxY) and its mutation in beta/gammaENaC causes Liddle syndrome, a hereditary hypertension. These (extended) PY motifs (PP(616)xY(618)xxL(621)) serve as binding sites for the ubiquitin ligase Nedd4-2, which decreases cell-surface expression of ENaC by unknown route(s). Using polarized kidney epithelia [Madin-Darby canine kidney I (MDCK-I)] cells stably expressing extracellularly myc-tagged wild type (WT) or PY-motif mutants of betaENaC (P616A, Y618A or L621A, with WT-alphagammaENaC), and live-imaging plus enzyme-linked immunosorbent assay (ELISA)-type assays to analyze routes/rates of ENaC internalization/recycling, we show here that cell-surface half-life of all PY mutants was fourfold longer than WT-ENaC (approximately 120 versus 30 minutes), reflecting primarily reduced channel internalization but also attenuated replenishment of cell-surface ENaC from a large subapical pool. The Y618A mutant revealed more severe internalization and replenishment defects than the other PY mutants. Internalized WT-ENaC was detected in sorting/recycling and late endosomes/lysosomes, while the Y618A mutant accumulated in the former. Nedd4-2 ubiquitinated ENaC at the apical membrane causing channel internalization and degradation. Cyclic AMP (cAMP) accelerated mobilization of subapical ENaC to the cell surface and long-term ENaC recycling, but only mobilization, not recycling, was inhibited in the PY mutants. These results suggest that the ENaC PY motifs (and Nedd4-2) primarily regulate channel internalization but also affect cAMP-dependent replenishment, providing important insight into the Liddle syndrome defects.
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Affiliation(s)
- Chen Lu
- Program in Cell Biology, The Hospital for Sick Children, Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada, M5G 1X8
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43
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Muise AM, Walters T, Wine E, Griffiths AM, Turner D, Duerr RH, Regueiro MD, Ngan BY, Xu W, Sherman PM, Silverberg MS, Rotin D. Protein-Tyrosine Phosphatase Sigma Is Associated with Ulcerative Colitis. Curr Biol 2007; 17:1212-8. [PMID: 17614280 DOI: 10.1016/j.cub.2007.06.013] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2007] [Revised: 06/04/2007] [Accepted: 06/05/2007] [Indexed: 11/26/2022]
Abstract
Inflammatory bowel disease (IBD), a relatively common chronic debilitating intestinal illness, is composed of two broadly defined groups, Crohn's disease (CD) and ulcerative colitis (UC). Although several susceptibility genes for CD have been recently described, susceptibility genes exclusive for UC have not been forthcoming. Here, we show that receptor protein-tyrosine phosphatase sigma (PTPRS-encoding PTPsigma) knockout mice spontaneously develop mild colitis that becomes severe when challenged with two known inducers of colitis. We also demonstrate that E-cadherin and beta-catenin, two important adherens junction proteins involved in maintenance of barrier defense in the colon, act as colonic substrates for PTPsigma. Furthermore, we show that three SNPs (rs886936, rs17130, and rs8100586) that flank exon 8 in the human PTPRS gene are associated with UC. The presence of these SNPs is associated with novel splicing that removes the third immunoglobulin-like domain (exon 9) from the extracellular portion of PTPsigma, possibly altering dimerization or ligand recognition. We propose that polymorphisms in the human PTPRS gene lead to ulcerative colitis.
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Affiliation(s)
- Aleixo M Muise
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, University of Toronto, 555 University Ave, Toronto, Ontario, Canada
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44
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Gupta R, Kus B, Fladd C, Wasmuth J, Tonikian R, Sidhu S, Krogan NJ, Parkinson J, Rotin D. Ubiquitination screen using protein microarrays for comprehensive identification of Rsp5 substrates in yeast. Mol Syst Biol 2007; 3:116. [PMID: 17551511 PMCID: PMC1911201 DOI: 10.1038/msb4100159] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2007] [Accepted: 04/24/2007] [Indexed: 01/25/2023] Open
Abstract
Ubiquitin-protein ligases (E3s) are responsible for target recognition and regulate stability, localization or function of their substrates. However, the substrates of most E3 enzymes remain unknown. Here, we describe the development of a novel proteomic in vitro ubiquitination screen using a protein microarray platform that can be utilized for the discovery of substrates for E3 ligases on a global scale. Using the yeast E3 Rsp5 as a test system to identify its substrates on a yeast protein microarray that covers most of the yeast (Saccharomyces cerevisiae) proteome, we identified numerous known and novel ubiquitinated substrates of this E3 ligase. Our enzymatic approach was complemented by a parallel protein microarray protein interaction study. Examination of the substrates identified in the analysis combined with phage display screening allowed exploration of binding mechanisms and substrate specificity of Rsp5. The development of a platform for global discovery of E3 substrates is invaluable for understanding the cellular pathways in which they participate, and could be utilized for the identification of drug targets.
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Affiliation(s)
- Ronish Gupta
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
| | - Bart Kus
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
| | - Christopher Fladd
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
| | - James Wasmuth
- Program in Molecular Structure and Function, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Raffi Tonikian
- Banting & Best Department of Medical Research, University of Toronto, Canada
- Department of Molecular and Medical Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Sachdev Sidhu
- Department of Protein Engineering, Genentech, South San Francisco, CA, USA
| | - Nevan J Krogan
- Department of Cellular and Molecular Pharmacology, University of California-San Francisco, San Francisco, CA, USA
| | - John Parkinson
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
- Program in Molecular Structure and Function, The Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Molecular and Medical Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Daniela Rotin
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
- Program in Cell Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8. Tel.: +1 416-813-5098; Fax: +1 416-813-8456;
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45
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Lu C, Jiang C, Pribanic S, Rotin D. CFTR stabilizes ENaC at the plasma membrane. J Cyst Fibros 2007; 6:419-22. [PMID: 17434346 DOI: 10.1016/j.jcf.2007.03.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2006] [Revised: 02/08/2007] [Accepted: 03/05/2007] [Indexed: 11/20/2022]
Abstract
CFTR was reported to regulate ENaC channel opening, decreasing ENaC activity in airways and increasing it in sweat ducts. We generated MDCK-I cell lines stably expressing tagged alphabetagammaENaC+CFTR or ENaC alone, and developed an assay to quantify cell-surface half-life of ENaC. Surprisingly, we found that co-expressed CFTR stabilizes ENaC at the plasma membrane, suggesting that CFTR regulates ENaC stability, not just opening.
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Affiliation(s)
- C Lu
- Program in Cell Biology, The Hospital for Sick Children, and Biochemistry Department, University of Toronto, 555 University Ave, Toronto, Ontario, Canada M5G 1X8
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Pak Y, Glowacka WK, Bruce MC, Pham N, Rotin D. Transport of LAPTM5 to lysosomes requires association with the ubiquitin ligase Nedd4, but not LAPTM5 ubiquitination. ACTA ACUST UNITED AC 2007; 175:631-45. [PMID: 17116753 PMCID: PMC2064599 DOI: 10.1083/jcb.200603001] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
LAPTM5 is a lysosomal transmembrane protein expressed in immune cells. We show that LAPTM5 binds the ubiquitin-ligase Nedd4 and GGA3 to promote LAPTM5 sorting from the Golgi to the lysosome, an event that is independent of LAPTM5 ubiquitination. LAPTM5 contains three PY motifs (L/PPxY), which bind Nedd4-WW domains, and a ubiquitin-interacting motif (UIM) motif. The Nedd4-LAPTM5 complex recruits ubiquitinated GGA3, which binds the LAPTM5-UIM; this interaction does not require the GGA3-GAT domain. LAPTM5 mutated in its Nedd4-binding sites (PY motifs) or its UIM is retained in the Golgi, as is LAPTM5 expressed in cells in which Nedd4 or GGA3 is knocked-down with RNAi. However, ubiquitination-impaired LAPTM5 can still traffic to the lysosome, suggesting that Nedd4 binding to LAPTM5, not LAPTM5 ubiquitination, is required for targeting. Interestingly, Nedd4 is also able to ubiquitinate GGA3. These results demonstrate a novel mechanism by which the ubiquitin-ligase Nedd4, via interactions with GGA3 and cargo (LAPTM5), regulates cargo trafficking to the lysosome without requiring cargo ubiquitination.
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Affiliation(s)
- Youngshil Pak
- Program in Cell Biology, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada, M5G 1X8
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Ing B, Shteiman-Kotler A, Castelli M, Henry P, Pak Y, Stewart B, Boulianne GL, Rotin D. Regulation of Commissureless by the ubiquitin ligase DNedd4 is required for neuromuscular synaptogenesis in Drosophila melanogaster. Mol Cell Biol 2007; 27:481-96. [PMID: 17074801 PMCID: PMC1800811 DOI: 10.1128/mcb.00463-06] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2006] [Revised: 05/23/2006] [Accepted: 10/18/2006] [Indexed: 11/20/2022] Open
Abstract
Muscle synaptogenesis in Drosophila melanogaster requires endocytosis of Commissureless (Comm), a binding partner for the ubiquitin ligase dNedd4. We investigated whether dNedd4 and ubiquitination mediate this process. Here we show that Comm is expressed in intracellular vesicles in the muscle, whereas Comm bearing mutations in the two PY motifs (L/PPXY) responsible for dNedd4 binding [Comm(2PY-->AY)], or bearing Lys-->Arg mutations in all Lys residues that serve as ubiquitin acceptor sites [Comm(10K-->R)], localize to the muscle surface, suggesting they cannot endocytose. Accordingly, aberrant muscle innervation is observed in the Comm(2PY-->AY) and Comm(10K-->R) mutants expressed early in muscle development. Similar muscle surface accumulation of Comm and innervation defects are observed when dNedd4 is knocked down by double-stranded RNA interference in the muscle, in dNedd4 heterozygote larvae, or in muscles overexpressing catalytically inactive dNedd4. Expression of the Comm mutants fused to a single ubiquitin that cannot be polyubiquitinated and mimics monoubiquitination [Comm(2PY-->AY)-monoUb or Comm(10K-->R)-monoUb] prevents the defects in both Comm endocytosis and synaptogenesis, suggesting that monoubiquitination is sufficient for Comm endocytosis in muscles. Expression of the Comm mutants later in muscle development, after synaptic innervation, has no effect. These results demonstrate that dNedd4 and ubiquitination are required for Commissureless endocytosis and proper neuromuscular synaptogenesis.
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Affiliation(s)
- Bryant Ing
- The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8
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Siu R, Fladd C, Rotin D. N-cadherin is an in vivo substrate for protein tyrosine phosphatase sigma (PTPsigma) and participates in PTPsigma-mediated inhibition of axon growth. Mol Cell Biol 2006; 27:208-19. [PMID: 17060446 PMCID: PMC1800655 DOI: 10.1128/mcb.00707-06] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Protein tyrosine phosphatase sigma (PTPsigma) belongs to the LAR family of receptor tyrosine phosphatases and was previously shown to negatively regulate axon growth. The substrate for PTPsigma and the effector(s) mediating this inhibitory effect were unknown. Here we report the identification of N-cadherin as an in vivo substrate for PTPsigma. Using brain lysates from PTPsigma knockout mice, in combination with substrate trapping, we identified a hyper-tyrosine-phosphorylated protein of approximately 120 kDa in the knockout animals (relative to sibling controls), which was identified by mass spectrometry and immunoblotting as N-cadherin. beta-Catenin also precipitated in the complex and was also a substrate for PTPsigma. Dorsal root ganglion (DRG) neurons, which highly express endogenous N-cadherin and PTPsigma, exhibited a faster growth rate in the knockout mice than in the sibling controls when grown on laminin or N-cadherin substrata. However, when N-cadherin function was disrupted by an inhibitory peptide or lowering calcium concentrations, the differential growth rate between the knockout and sibling control mice was greatly diminished. These results suggest that the elevated tyrosine phosphorylation of N-cadherin in the PTPsigma(-/-) mice likely disrupted N-cadherin function, resulting in accelerated DRG nerve growth. We conclude that N-cadherin is a physiological substrate for PTPsigma and that N-cadherin (and likely beta-catenin) participates in PTPsigma-mediated inhibition of axon growth.
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Affiliation(s)
- Roberta Siu
- Program in Cell Biology, The Hospital for Sick Children, 555 University Avenue, Toronto M5G 1X8, Ontario, Canada
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Kanelis V, Bruce MC, Skrynnikov NR, Rotin D, Forman-Kay JD. Structural determinants for high-affinity binding in a Nedd4 WW3* domain-Comm PY motif complex. Structure 2006; 14:543-53. [PMID: 16531238 DOI: 10.1016/j.str.2005.11.018] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2005] [Revised: 11/04/2005] [Accepted: 11/13/2005] [Indexed: 11/28/2022]
Abstract
Interactions between the WW domains of Drosophila Nedd4 (dNedd4) and Commissureless (Comm) PY motifs promote axon crossing at the CNS midline and muscle synaptogenesis. Here we report the solution structure of the dNedd4 WW3* domain complexed to the second PY motif (227'TGLPSYDEALH237') of Comm. Unexpectedly, there are interactions between WW3* and ligand residues both N- and C-terminal to the PY motif. Residues Y232'-L236' form a helical turn, following the PPII helical PY motif. Mutagenesis and binding studies confirm the importance of these extensive contacts, not simultaneously observed in other WW domain complexes, and identify a variable loop in WW3* responsible for its high-affinity interaction. These studies expand our general understanding of the molecular determinants involved in WW domain-ligand recognition. In addition, they provide insights into the specific regulation of dNedd4-mediated ubiquitination of Comm and subsequent internalization of Comm or the Comm/Roundabout complex, critical for CNS and muscle development.
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Affiliation(s)
- Voula Kanelis
- Programme in Structural Biology and Biochemistry, Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada
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50
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Kirkham DL, Pacey LKK, Axford MM, Siu R, Rotin D, Doering LC. Neural stem cells from protein tyrosine phosphatase sigma knockout mice generate an altered neuronal phenotype in culture. BMC Neurosci 2006; 7:50. [PMID: 16784531 PMCID: PMC1570144 DOI: 10.1186/1471-2202-7-50] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2006] [Accepted: 06/19/2006] [Indexed: 02/07/2023] Open
Abstract
Background The LAR family Protein Tyrosine Phosphatase sigma (PTPσ) has been implicated in neuroendocrine and neuronal development, and shows strong expression in specific regions within the CNS, including the subventricular zone (SVZ). We established neural stem cell cultures, grown as neurospheres, from the SVZ of PTPσ knockout mice and sibling controls to determine if PTPσ influences the generation and the phenotype of the neuronal, astrocyte and oligodendrocyte cell lineages. Results The neurospheres from the knockout mice acquired heterogeneous developmental characteristics and they showed similar morphological characteristics to the age matched siblings. Although Ptprs expression decreases as a function of developmental age in vivo, it remains high with the continual renewal and passage of the neurospheres. Stem cells, progenitors and differentiated neurons, astrocytes and oligodendrocytes all express the gene. While no apparent differences were observed in developing neurospheres or in the astrocytes and oligodendrocytes from the PTPσ knockout mice, the neuronal migration patterns and neurites were altered when studied in culture. In particular, neurons migrated farther from the neurosphere centers and the neurite outgrowth exceeded the length of the neuronal processes from age matched sibling controls. Conclusion Our results imply a specific role for PTPσ in the neuronal lineage, particularly in the form of inhibitory influences on neurite outgrowth, and demonstrate a role for tyrosine phosphatases in neuronal stem cell differentiation.
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Affiliation(s)
- David L Kirkham
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton Ontario, L8N 3Z5, Canada
| | - Laura KK Pacey
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton Ontario, L8N 3Z5, Canada
| | - Michelle M Axford
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton Ontario, L8N 3Z5, Canada
| | - Roberta Siu
- Cell Biology Program, The Hospital for Sick Children and Department of Biochemistry, University of Toronto, Toronto, Ontario, M5G 1X8, Canada
| | - Daniela Rotin
- Cell Biology Program, The Hospital for Sick Children and Department of Biochemistry, University of Toronto, Toronto, Ontario, M5G 1X8, Canada
| | - Laurie C Doering
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton Ontario, L8N 3Z5, Canada
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