1
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Owens DDG, Maitland MER, Khalili Yazdi A, Song X, Reber V, Schwalm MP, Machado RAC, Bauer N, Wang X, Szewczyk MM, Dong C, Dong A, Loppnau P, Calabrese MF, Dowling MS, Lee J, Montgomery JI, O'Connell TN, Subramanyam C, Wang F, Adamson EC, Schapira M, Gstaiger M, Knapp S, Vedadi M, Min J, Lajoie GA, Barsyte-Lovejoy D, Owen DR, Schild-Poulter C, Arrowsmith CH. A chemical probe to modulate human GID4 Pro/N-degron interactions. Nat Chem Biol 2024; 20:1164-1175. [PMID: 38773330 DOI: 10.1038/s41589-024-01618-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 04/12/2024] [Indexed: 05/23/2024]
Abstract
The C-terminal to LisH (CTLH) complex is a ubiquitin ligase complex that recognizes substrates with Pro/N-degrons via its substrate receptor Glucose-Induced Degradation 4 (GID4), but its function and substrates in humans remain unclear. Here, we report PFI-7, a potent, selective and cell-active chemical probe that antagonizes Pro/N-degron binding to human GID4. Use of PFI-7 in proximity-dependent biotinylation and quantitative proteomics enabled the identification of GID4 interactors and GID4-regulated proteins. GID4 interactors are enriched for nucleolar proteins, including the Pro/N-degron-containing RNA helicases DDX21 and DDX50. We also identified a distinct subset of proteins whose cellular levels are regulated by GID4 including HMGCS1, a Pro/N-degron-containing metabolic enzyme. These data reveal human GID4 Pro/N-degron targets regulated through a combination of degradative and nondegradative functions. Going forward, PFI-7 will be a valuable research tool for investigating CTLH complex biology and facilitating development of targeted protein degradation strategies that highjack CTLH E3 ligase activity.
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Affiliation(s)
- Dominic D G Owens
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
| | - Matthew E R Maitland
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
- Robarts Research Institute, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- Department of Biochemistry, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- Don Rix Protein Identification Facility, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | | | - Xiaosheng Song
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
| | - Viviane Reber
- Institute of Molecular Systems Biology at ETH Zurich, Zurich, Switzerland
| | - Martin P Schwalm
- Institut für Pharmazeutische Chemie, Goethe-University Frankfurt, Biozentrum, Frankfurt am Main, Germany
- Structural Genomics Consortium, Goethe-University Frankfurt, Buchmann Institute for Life Sciences, Frankfurt am Main, Germany
| | - Raquel A C Machado
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
| | - Nicolas Bauer
- Institut für Pharmazeutische Chemie, Goethe-University Frankfurt, Biozentrum, Frankfurt am Main, Germany
- Structural Genomics Consortium, Goethe-University Frankfurt, Buchmann Institute for Life Sciences, Frankfurt am Main, Germany
| | - Xu Wang
- Robarts Research Institute, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | | | - Cheng Dong
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
| | - Aiping Dong
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
| | - Peter Loppnau
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
| | | | | | - Jisun Lee
- Development and Medical, Pfizer Worldwide Research, Groton, CT, USA
| | | | | | | | - Feng Wang
- Development and Medical, Pfizer Worldwide Research, Groton, CT, USA
| | - Ella C Adamson
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
| | - Matthieu Schapira
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
| | - Matthias Gstaiger
- Institute of Molecular Systems Biology at ETH Zurich, Zurich, Switzerland
| | - Stefan Knapp
- Institut für Pharmazeutische Chemie, Goethe-University Frankfurt, Biozentrum, Frankfurt am Main, Germany
- Structural Genomics Consortium, Goethe-University Frankfurt, Buchmann Institute for Life Sciences, Frankfurt am Main, Germany
| | - Masoud Vedadi
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
| | - Jinrong Min
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - Gilles A Lajoie
- Department of Biochemistry, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- Don Rix Protein Identification Facility, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Dalia Barsyte-Lovejoy
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
| | - Dafydd R Owen
- Development and Medical, Pfizer Worldwide Research, Groton, CT, USA
| | - Caroline Schild-Poulter
- Robarts Research Institute, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- Department of Biochemistry, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Cheryl H Arrowsmith
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada.
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada.
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2
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Barbulescu P, Chana CK, Wong MK, Ben Makhlouf I, Bruce JP, Feng Y, Keszei AFA, Wong C, Mohamad-Ramshan R, McGary LC, Kashem MA, Ceccarelli DF, Orlicky S, Fang Y, Kuang H, Mazhab-Jafari M, Pezo RC, Bhagwat AS, Pugh TJ, Gingras AC, Sicheri F, Martin A. FAM72A degrades UNG2 through the GID/CTLH complex to promote mutagenic repair during antibody maturation. Nat Commun 2024; 15:7541. [PMID: 39215025 PMCID: PMC11364545 DOI: 10.1038/s41467-024-52009-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 08/23/2024] [Indexed: 09/04/2024] Open
Abstract
A diverse antibody repertoire is essential for humoral immunity. Antibody diversification requires the introduction of deoxyuridine (dU) mutations within immunoglobulin genes to initiate somatic hypermutation (SHM) and class switch recombination (CSR). dUs are normally recognized and excised by the base excision repair (BER) protein uracil-DNA glycosylase 2 (UNG2). However, FAM72A downregulates UNG2 permitting dUs to persist and trigger SHM and CSR. How FAM72A promotes UNG2 degradation is unknown. Here, we show that FAM72A recruits a C-terminal to LisH (CTLH) E3 ligase complex to target UNG2 for proteasomal degradation. Deficiency in CTLH complex components result in elevated UNG2 and reduced SHM and CSR. Cryo-EM structural analysis reveals FAM72A directly binds to MKLN1 within the CTLH complex to recruit and ubiquitinate UNG2. Our study further suggests that FAM72A hijacks the CTLH complex to promote mutagenesis in cancer. These findings show that FAM72A is an E3 ligase substrate adaptor critical for humoral immunity and cancer development.
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Affiliation(s)
- Philip Barbulescu
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Chetan K Chana
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
| | - Matthew K Wong
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Ines Ben Makhlouf
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Jeffrey P Bruce
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON, Canada
| | - Yuqing Feng
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Alexander F A Keszei
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON, Canada
| | - Cassandra Wong
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
- Department of Chemistry, Wayne State University, Detroit, MI, USA
| | | | - Laura C McGary
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
- Department of Chemistry, Wayne State University, Detroit, MI, USA
| | - Mohammad A Kashem
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Derek F Ceccarelli
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
| | - Stephen Orlicky
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
| | - Yifei Fang
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Huihui Kuang
- Cryo-Electron Microscopy Core, New York University School of Medicine, New York, NY, USA
| | - Mohammad Mazhab-Jafari
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON, Canada
| | | | - Ashok S Bhagwat
- Department of Chemistry, Wayne State University, Detroit, MI, USA
| | - Trevor J Pugh
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON, Canada
| | - Anne-Claude Gingras
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Frank Sicheri
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada.
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada.
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada.
| | - Alberto Martin
- Department of Immunology, University of Toronto, Toronto, ON, Canada.
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3
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Gross A, Müller J, Chrustowicz J, Strasser A, Gottemukkala KV, Sherpa D, Schulman BA, Murray PJ, Alpi AF. Skraban-Deardorff intellectual disability syndrome-associated mutations in WDR26 impair CTLH E3 complex assembly. FEBS Lett 2024; 598:978-994. [PMID: 38575527 DOI: 10.1002/1873-3468.14866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 03/07/2024] [Accepted: 03/11/2024] [Indexed: 04/06/2024]
Abstract
Patients with Skraban-Deardorff syndrome (SKDEAS), a neurodevelopmental syndrome associated with a spectrum of developmental and intellectual delays and disabilities, harbor diverse mutations in WDR26, encoding a subunit of the multiprotein CTLH E3 ubiquitin ligase complex. Structural studies revealed that homodimers of WDR26 bridge two core-CTLH E3 complexes to generate giant, hollow oval-shaped supramolecular CTLH E3 assemblies. Additionally, WDR26 mediates CTLH E3 complex binding to subunit YPEL5 and functions as substrate receptor for the transcriptional repressor HBP1. Here, we mapped SKDEAS-associated mutations on a WDR26 structural model and tested their functionality in complementation studies using genetically engineered human cells lacking CTLH E3 supramolecular assemblies. Despite the diversity of mutations, 15 of 16 tested mutants impaired at least one CTLH E3 complex function contributing to complex assembly and interactions, thus providing first mechanistic insights into SKDEAS pathology.
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Affiliation(s)
- Annette Gross
- Immunoregulation Research Group, Max Planck Institute of Biochemistry, Martinsried, Germany
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Judith Müller
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Jakub Chrustowicz
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Alexander Strasser
- Immunoregulation Research Group, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Karthik V Gottemukkala
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Dawafuti Sherpa
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Brenda A Schulman
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Peter J Murray
- Immunoregulation Research Group, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Arno F Alpi
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
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4
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A single helix repression domain is functional across diverse eukaryotes. Proc Natl Acad Sci U S A 2022; 119:e2206986119. [PMID: 36191192 PMCID: PMC9564828 DOI: 10.1073/pnas.2206986119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The corepressor TOPLESS (TPL) and its paralogs coordinately regulate a large number of genes critical to plant development and immunity. As in many members of the larger pan-eukaryotic Tup1/TLE/Groucho corepressor family, TPL contains a Lis1 Homology domain (LisH), whose function is not well understood. We have previously found that the LisH in TPL-and specifically the N-terminal 18 amino acid alpha-helical region (TPL-H1)-can act as an autonomous repression domain. We hypothesized that homologous domains across diverse LisH-containing proteins could share the same function. To test that hypothesis, we built a library of H1s that broadly sampled the sequence and evolutionary space of LisH domains, and tested their activity in a synthetic transcriptional repression assay in Saccharomyces cerevisiae. Using this approach, we found that repression activity was highly conserved and likely the ancestral function of this motif. We also identified key residues that contribute to repressive function. We leveraged this new knowledge for two applications. First, we tested the role of mutations found in somatic cancers on repression function in two human LisH-containing proteins. Second, we validated function of many of our repression domains in plants, confirming that these sequences should be of use to synthetic biology applications across many eukaryotes.
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5
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Onea G, Maitland MER, Wang X, Lajoie GA, Schild-Poulter C. Distinct assemblies and interactomes of the nuclear and cytoplasmic mammalian CTLH E3 ligase complex. J Cell Sci 2022; 135:276121. [PMID: 35833506 DOI: 10.1242/jcs.259638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 06/27/2022] [Indexed: 11/20/2022] Open
Abstract
The C-terminal to LisH (CTLH) complex is a newly discovered multi-subunit E3 ubiquitin ligase whose cellular functions are poorly characterized. While some CTLH subunits have been found to localize in both the nucleus and cytoplasm of mammalian cells, differences between the compartment-specific complexes have not been explored. Here, we show that the CTLH complex forms different molecular weight complexes in nuclear and cytoplasmic fractions. Loss of WDR26 severely decreases nuclear CTLH complex subunit levels and impairs higher-order CTLH complex formation, revealing WDR26 as a critical determinant of CTLH complex nuclear stability. Through affinity purification coupled to mass spectrometry (AP-MS) of endogenous CTLH complex member RanBPM from nuclear and cytoplasmic fractions, we identified over 170 compartment-specific interactors involved in various conserved biological processes such as ribonucleoprotein biogenesis and chromatin assembly. We validated the nuclear-specific RanBPM interaction with macroH2A1 and the cytoplasmic-specific interaction with Tankyrase-1/2. Overall, this study provides critical insights into CTLH complex function and composition in both the cytoplasm and nucleus.
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Affiliation(s)
- Gabriel Onea
- Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, University of Western Ontario, London, Ontario, ON N6G 2V4, Canada
| | - Matthew E R Maitland
- Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, University of Western Ontario, London, Ontario, ON N6G 2V4, Canada.,Don Rix Protein Identification Facility, University of Western Ontario, London, Ontario, N6G 2V4, Canada
| | - Xu Wang
- Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, University of Western Ontario, London, Ontario, ON N6G 2V4, Canada
| | - Gilles A Lajoie
- Department of Biochemistry, University of Western Ontario, London, Ontario, ON N6G 2V4, Canada.,Don Rix Protein Identification Facility, University of Western Ontario, London, Ontario, N6G 2V4, Canada
| | - Caroline Schild-Poulter
- Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, University of Western Ontario, London, Ontario, ON N6G 2V4, Canada
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6
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Hantel F, Liu H, Fechtner L, Neuhaus H, Ding J, Arlt D, Walentek P, Villavicencio-Lorini P, Gerhardt C, Hollemann T, Pfirrmann T. Cilia-localized GID/CTLH ubiquitin ligase complex regulates protein homeostasis of sonic hedgehog signaling components. J Cell Sci 2022; 135:jcs259209. [PMID: 35543155 PMCID: PMC9264362 DOI: 10.1242/jcs.259209] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 03/24/2022] [Indexed: 01/18/2023] Open
Abstract
Cilia are evolutionarily conserved organelles that orchestrate a variety of signal transduction pathways, such as sonic hedgehog (SHH) signaling, during embryonic development. Our recent studies have shown that loss of GID ubiquitin ligase function results in aberrant AMP-activated protein kinase (AMPK) activation and elongated primary cilia, which suggests a functional connection to cilia. Here, we reveal that the GID complex is an integral part of the cilium required for primary cilia-dependent signal transduction and the maintenance of ciliary protein homeostasis. We show that GID complex subunits localize to cilia in both Xenopus laevis and NIH3T3 cells. Furthermore, we report SHH signaling pathway defects that are independent of AMPK and mechanistic target of rapamycin (MTOR) activation. Despite correct localization of SHH signaling components at the primary cilium and functional GLI3 processing, we find a prominent reduction of some SHH signaling components in the cilium and a significant decrease in SHH target gene expression. Since our data reveal a critical function of the GID complex at the primary cilium, and because suppression of GID function in X. laevis results in ciliopathy-like phenotypes, we suggest that GID subunits are candidate genes for human ciliopathies that coincide with defects in SHH signal transduction.
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Affiliation(s)
- Friederike Hantel
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg, 06114 Halle, Germany
| | - Huaize Liu
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg, 06114 Halle, Germany
| | - Lisa Fechtner
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg, 06114 Halle, Germany
| | - Herbert Neuhaus
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg, 06114 Halle, Germany
| | - Jie Ding
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg, 06114 Halle, Germany
| | - Danilo Arlt
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg, 06114 Halle, Germany
| | - Peter Walentek
- Renal Division, Department of Medicine, University Hospital Freiburg, Freiburg University Faculty of Medicine, 79106 Freiburg, Germany
- CIBSS – Centre for Integrative Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany
| | | | - Christoph Gerhardt
- Department of Medicine, Health and Medical University, 14471 Potsdam, Germany
| | - Thomas Hollemann
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg, 06114 Halle, Germany
| | - Thorsten Pfirrmann
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg, 06114 Halle, Germany
- Department of Medicine, Health and Medical University, 14471 Potsdam, Germany
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7
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A Missense Variant in SLC39A4 in a Litter of Turkish Van Cats with Acrodermatitis Enteropathica. Genes (Basel) 2021; 12:genes12091309. [PMID: 34573291 PMCID: PMC8469226 DOI: 10.3390/genes12091309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 08/20/2021] [Accepted: 08/25/2021] [Indexed: 11/17/2022] Open
Abstract
In a litter of Turkish Van cats, three out of six kittens developed severe signs of skin disease, diarrhea, and systemic signs of stunted growth at 6 weeks of age. Massive secondary infections of the skin lesions evolved. Histopathological examinations showed a mild to moderate hyperplastic epidermis, covered by a thick layer of laminar to compact, mostly parakeratotic keratin. The dermis was infiltrated with moderate amounts of lymphocytes and plasma cells. Due to the severity of the clinical signs, one affected kitten died and the other two had to be euthanized. We sequenced the genome of one affected kitten and compared the data to 54 control genomes. A search for private variants in the two candidate genes for the observed phenotype, MKLN1 and SLC39A4, revealed a single protein-changing variant, SLC39A4:c.1057G>C or p.Gly353Arg. The solute carrier family 39 member 4 gene (SLC39A4) encodes an intestinal zinc transporter required for the uptake of dietary zinc. The variant is predicted to change a highly conserved glycine residue within the first transmembrane domain, which most likely leads to a loss of function. The genotypes of the index family showed the expected co-segregation with the phenotype and the mutant allele was absent from 173 unrelated control cats. Together with the knowledge on the effects of SLC39A4 variants in other species, these data suggest SLC39A4:c.1057G>C as candidate causative genetic variant for the phenotype in the investigated kittens. In line with the human phenotype, we propose to designate this disease acrodermatitis enteropathica (AE).
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8
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Maitland MER, Kuljanin M, Wang X, Lajoie GA, Schild-Poulter C. Proteomic analysis of ubiquitination substrates reveals a CTLH E3 ligase complex-dependent regulation of glycolysis. FASEB J 2021; 35:e21825. [PMID: 34383978 PMCID: PMC9292413 DOI: 10.1096/fj.202100664r] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/25/2021] [Accepted: 07/15/2021] [Indexed: 11/11/2022]
Abstract
Ubiquitination is an essential post‐translational modification that regulates protein stability or function. Its substrate specificity is dictated by various E3 ligases. The human C‐terminal to LisH (CTLH) complex is a newly discovered multi‐subunit really interesting new gene (RING) E3 ligase with only a few known ubiquitination targets. Here, we used mass spectrometry‐based proteomic techniques to gain insight into CTLH complex function and ubiquitination substrates in HeLa cells. First, global proteomics determined proteins that were significantly increased, and thus may be substrates targeted for degradation, in cells depleted of CTLH complex member RanBPM. RanBPM‐dependent ubiquitination determined using diGLY‐enriched proteomics and the endogenous RanBPM interactome further revealed candidate ubiquitination targets. Three glycolysis enzymes alpha‐enolase, L‐lactate dehydrogenase A chain (LDHA), and pyruvate kinase M1/2 (PKM) had decreased ubiquitin sites in shRanBPM cells and were found associated with RanBPM in the interactome. Reduced polyubiquitination was validated for PKM2 and LDHA in cells depleted of RanBPM and CTLH complex RING domain subunit RMND5A. PKM2 and LDHA protein levels were unchanged, yet their activity was increased in extracts of cells with downregulated RanBPM. Finally, RanBPM deficient cells displayed enhanced glycolysis and deregulated central carbon metabolism. Overall, this study identifies potential CTLH complex ubiquitination substrates and uncovers that the CTLH complex inhibits glycolysis via non‐degradative ubiquitination of PKM2 and LDHA.
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Affiliation(s)
- Matthew E R Maitland
- Robarts Research Institute, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.,Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.,Don Rix Protein Identification Facility, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
| | - Miljan Kuljanin
- Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.,Don Rix Protein Identification Facility, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
| | - Xu Wang
- Robarts Research Institute, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
| | - Gilles A Lajoie
- Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.,Don Rix Protein Identification Facility, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
| | - Caroline Schild-Poulter
- Robarts Research Institute, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.,Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
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9
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Kong KYE, Fischer B, Meurer M, Kats I, Li Z, Rühle F, Barry JD, Kirrmaier D, Chevyreva V, San Luis BJ, Costanzo M, Huber W, Andrews BJ, Boone C, Knop M, Khmelinskii A. Timer-based proteomic profiling of the ubiquitin-proteasome system reveals a substrate receptor of the GID ubiquitin ligase. Mol Cell 2021; 81:2460-2476.e11. [PMID: 33974913 PMCID: PMC8189435 DOI: 10.1016/j.molcel.2021.04.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 03/15/2021] [Accepted: 04/19/2021] [Indexed: 01/01/2023]
Abstract
Selective protein degradation by the ubiquitin-proteasome system (UPS) is involved in all cellular processes. However, the substrates and specificity of most UPS components are not well understood. Here we systematically characterized the UPS in Saccharomyces cerevisiae. Using fluorescent timers, we determined how loss of individual UPS components affects yeast proteome turnover, detecting phenotypes for 76% of E2, E3, and deubiquitinating enzymes. We exploit this dataset to gain insights into N-degron pathways, which target proteins carrying N-terminal degradation signals. We implicate Ubr1, an E3 of the Arg/N-degron pathway, in targeting mitochondrial proteins processed by the mitochondrial inner membrane protease. Moreover, we identify Ylr149c/Gid11 as a substrate receptor of the glucose-induced degradation-deficient (GID) complex, an E3 of the Pro/N-degron pathway. Our results suggest that Gid11 recognizes proteins with N-terminal threonines, expanding the specificity of the GID complex. This resource of potential substrates and relationships between UPS components enables exploring functions of selective protein degradation.
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Affiliation(s)
| | - Bernd Fischer
- Computational Genome Biology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Matthias Meurer
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Ilia Kats
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Zhaoyan Li
- Institute of Molecular Biology (IMB), Mainz, Germany
| | - Frank Rühle
- Institute of Molecular Biology (IMB), Mainz, Germany
| | - Joseph D Barry
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Daniel Kirrmaier
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany; Cell Morphogenesis and Signal Transduction, German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Veronika Chevyreva
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Bryan-Joseph San Luis
- The Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Michael Costanzo
- The Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Wolfgang Huber
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Brenda J Andrews
- The Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Charles Boone
- The Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Michael Knop
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany; Cell Morphogenesis and Signal Transduction, German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance, Heidelberg, Germany.
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10
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Sherpa D, Chrustowicz J, Qiao S, Langlois CR, Hehl LA, Gottemukkala KV, Hansen FM, Karayel O, von Gronau S, Prabu JR, Mann M, Alpi AF, Schulman BA. GID E3 ligase supramolecular chelate assembly configures multipronged ubiquitin targeting of an oligomeric metabolic enzyme. Mol Cell 2021; 81:2445-2459.e13. [PMID: 33905682 PMCID: PMC8189437 DOI: 10.1016/j.molcel.2021.03.025] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 02/17/2021] [Accepted: 03/17/2021] [Indexed: 12/31/2022]
Abstract
How are E3 ubiquitin ligases configured to match substrate quaternary structures? Here, by studying the yeast GID complex (mutation of which causes deficiency in glucose-induced degradation of gluconeogenic enzymes), we discover supramolecular chelate assembly as an E3 ligase strategy for targeting an oligomeric substrate. Cryoelectron microscopy (cryo-EM) structures show that, to bind the tetrameric substrate fructose-1,6-bisphosphatase (Fbp1), two minimally functional GID E3s assemble into the 20-protein Chelator-GIDSR4, which resembles an organometallic supramolecular chelate. The Chelator-GIDSR4 assembly avidly binds multiple Fbp1 degrons so that multiple Fbp1 protomers are simultaneously ubiquitylated at lysines near the allosteric and substrate binding sites. Importantly, key structural and biochemical features, including capacity for supramolecular assembly, are preserved in the human ortholog, the CTLH E3. Based on our integrative structural, biochemical, and cell biological data, we propose that higher-order E3 ligase assembly generally enables multipronged targeting, capable of simultaneously incapacitating multiple protomers and functionalities of oligomeric substrates.
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Affiliation(s)
- Dawafuti Sherpa
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Jakub Chrustowicz
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Shuai Qiao
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Christine R Langlois
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Laura A Hehl
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Karthik Varma Gottemukkala
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Fynn M Hansen
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Ozge Karayel
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Susanne von Gronau
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - J Rajan Prabu
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Matthias Mann
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Arno F Alpi
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Brenda A Schulman
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany.
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11
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Wei Q, Pinho S, Dong S, Pierce H, Li H, Nakahara F, Xu J, Xu C, Boulais PE, Zhang D, Maryanovich M, Cuervo AM, Frenette PS. MAEA is an E3 ubiquitin ligase promoting autophagy and maintenance of haematopoietic stem cells. Nat Commun 2021; 12:2522. [PMID: 33947846 PMCID: PMC8097058 DOI: 10.1038/s41467-021-22749-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Accepted: 03/22/2021] [Indexed: 12/11/2022] Open
Abstract
Haematopoietic stem cells (HSCs) tightly regulate their quiescence, proliferation, and differentiation to generate blood cells during the entire lifetime. The mechanisms by which these critical activities are balanced are still unclear. Here, we report that Macrophage-Erythroblast Attacher (MAEA, also known as EMP), a receptor thus far only identified in erythroblastic island, is a membrane-associated E3 ubiquitin ligase subunit essential for HSC maintenance and lymphoid potential. Maea is highly expressed in HSCs and its deletion in mice severely impairs HSC quiescence and leads to a lethal myeloproliferative syndrome. Mechanistically, we have found that the surface expression of several haematopoietic cytokine receptors (e.g. MPL, FLT3) is stabilised in the absence of Maea, thereby prolonging their intracellular signalling. This is associated with impaired autophagy flux in HSCs but not in mature haematopoietic cells. Administration of receptor kinase inhibitor or autophagy-inducing compounds rescues the functional defects of Maea-deficient HSCs. Our results suggest that MAEA provides E3 ubiquitin ligase activity, guarding HSC function by restricting cytokine receptor signalling via autophagy.
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Affiliation(s)
- Qiaozhi Wei
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Bronx, NY, USA
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA
- Regeneron Pharmaceuticals, Inc., Tarrytown, NY, USA
| | - Sandra Pinho
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Bronx, NY, USA
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA
- Department of Medicine, Albert Einstein College of Medicine, Bronx, NY, USA
- Department of Pharmacology, University of Illinois at Chicago, Chicago, IL, USA
| | - Shuxian Dong
- Department of Development and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Halley Pierce
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Bronx, NY, USA
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Huihui Li
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Bronx, NY, USA
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Fumio Nakahara
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Bronx, NY, USA
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA
- Department of Hematology and Oncology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Jianing Xu
- Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Chunliang Xu
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Bronx, NY, USA
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Philip E Boulais
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Bronx, NY, USA
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Dachuan Zhang
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Bronx, NY, USA
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Maria Maryanovich
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Bronx, NY, USA
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Ana Maria Cuervo
- Department of Development and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY, USA
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY, USA
- Institute for Aging Studies, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Paul S Frenette
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Bronx, NY, USA.
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA.
- Department of Medicine, Albert Einstein College of Medicine, Bronx, NY, USA.
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12
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Cao WX, Kabelitz S, Gupta M, Yeung E, Lin S, Rammelt C, Ihling C, Pekovic F, Low TCH, Siddiqui NU, Cheng MHK, Angers S, Smibert CA, Wühr M, Wahle E, Lipshitz HD. Precise Temporal Regulation of Post-transcriptional Repressors Is Required for an Orderly Drosophila Maternal-to-Zygotic Transition. Cell Rep 2021; 31:107783. [PMID: 32579915 PMCID: PMC7372737 DOI: 10.1016/j.celrep.2020.107783] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 05/06/2020] [Accepted: 05/28/2020] [Indexed: 12/12/2022] Open
Abstract
In animal embryos, the maternal-to-zygotic transition (MZT) hands developmental control from maternal to zygotic gene products. We show that the maternal proteome represents more than half of the protein-coding capacity of Drosophila melanogaster’s genome, and that 2% of this proteome is rapidly degraded during the MZT. Cleared proteins include the post-transcriptional repressors Cup, Trailer hitch (TRAL), Maternal expression at 31B (ME31B), and Smaug (SMG). Although the ubiquitin-proteasome system is necessary for clearance of these repressors, distinct E3 ligase complexes target them: the C-terminal to Lis1 Homology (CTLH) complex targets Cup, TRAL, and ME31B for degradation early in the MZT and the Skp/Cullin/F-box-containing (SCF) complex targets SMG at the end of the MZT. Deleting the C-terminal 233 amino acids of SMG abrogates F-box protein interaction and confers immunity to degradation. Persistent SMG downregulates zygotic re-expression of mRNAs whose maternal contribution is degraded by SMG. Thus, clearance of SMG permits an orderly MZT. Cao et al. show that 2% of the proteome is degraded in early Drosophila embryos, including a repressive ribonucleoprotein complex. Two E3 ubiquitin ligases separately act on distinct components of this complex to phase their clearance. Failure to degrade a key component, the Smaug RNA-binding protein, disrupts an orderly maternal-to-zygotic transition.
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Affiliation(s)
- Wen Xi Cao
- Department of Molecular Genetics, University of Toronto, 661 University Avenue, Toronto, ON M5G 1M1, Canada
| | - Sarah Kabelitz
- Institute of Biochemistry and Biotechnology and Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3, 06099 Halle, Germany
| | - Meera Gupta
- Department of Molecular Biology and the Lewis-Sigler Institute, Princeton University, Washington Road, Princeton, NJ 08544, USA
| | - Eyan Yeung
- Department of Molecular Biology and the Lewis-Sigler Institute, Princeton University, Washington Road, Princeton, NJ 08544, USA
| | - Sichun Lin
- Department of Pharmaceutical Sciences, University of Toronto, 144 College Street, Toronto, ON M5S 3M2, Canada
| | - Christiane Rammelt
- Institute of Biochemistry and Biotechnology and Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3, 06099 Halle, Germany
| | - Christian Ihling
- Institute of Pharmacy and Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3, 06099 Halle, Germany
| | - Filip Pekovic
- Institute of Biochemistry and Biotechnology and Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3, 06099 Halle, Germany
| | - Timothy C H Low
- Department of Molecular Genetics, University of Toronto, 661 University Avenue, Toronto, ON M5G 1M1, Canada
| | - Najeeb U Siddiqui
- Department of Molecular Genetics, University of Toronto, 661 University Avenue, Toronto, ON M5G 1M1, Canada
| | - Matthew H K Cheng
- Department of Biochemistry, University of Toronto, 661 University Avenue, Toronto, ON M5G 1M1, Canada
| | - Stephane Angers
- Department of Pharmaceutical Sciences, University of Toronto, 144 College Street, Toronto, ON M5S 3M2, Canada; Department of Biochemistry, University of Toronto, 661 University Avenue, Toronto, ON M5G 1M1, Canada
| | - Craig A Smibert
- Department of Molecular Genetics, University of Toronto, 661 University Avenue, Toronto, ON M5G 1M1, Canada; Department of Biochemistry, University of Toronto, 661 University Avenue, Toronto, ON M5G 1M1, Canada
| | - Martin Wühr
- Department of Molecular Biology and the Lewis-Sigler Institute, Princeton University, Washington Road, Princeton, NJ 08544, USA
| | - Elmar Wahle
- Institute of Biochemistry and Biotechnology and Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3, 06099 Halle, Germany.
| | - Howard D Lipshitz
- Department of Molecular Genetics, University of Toronto, 661 University Avenue, Toronto, ON M5G 1M1, Canada.
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13
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He D, Wu D, Muller S, Wang L, Saha P, Ahanger SH, Liu SJ, Cui M, Hong SJ, Jain M, Olson HE, Akeson M, Costello JF, Diaz A, Lim DA. miRNA-independent function of long noncoding pri-miRNA loci. Proc Natl Acad Sci U S A 2021; 118:e2017562118. [PMID: 33758101 PMCID: PMC8020771 DOI: 10.1073/pnas.2017562118] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Among the large, diverse set of mammalian long noncoding RNAs (lncRNAs), long noncoding primary microRNAs (lnc-pri-miRNAs) are those that host miRNAs. Whether lnc-pri-miRNA loci have important biological function independent of their cognate miRNAs is poorly understood. From a genome-scale lncRNA screen, lnc-pri-miRNA loci were enriched for function in cell proliferation, and in glioblastoma (i.e., GBM) cells with DGCR8 or DROSHA knockdown, lnc-pri-miRNA screen hits still regulated cell growth. To molecularly dissect the function of a lnc-pri-miRNA locus, we studied LOC646329 (also known as MIR29HG), which hosts the miR-29a/b1 cluster. In GBM cells, LOC646329 knockdown reduced miR-29a/b1 levels, and these cells exhibited decreased growth. However, genetic deletion of the miR-29a/b1 cluster (LOC646329-miR29Δ) did not decrease cell growth, while knockdown of LOC646329-miR29Δ transcripts reduced cell proliferation. The miR-29a/b1-independent activity of LOC646329 corresponded to enhancer-like activation of a neighboring oncogene (MKLN1), regulating cell propagation. The LOC646329 locus interacts with the MKLN1 promoter, and antisense oligonucleotide knockdown of the lncRNA disrupts these interactions and reduces the enhancer-like activity. More broadly, analysis of genome-wide data from multiple human cell types showed that lnc-pri-miRNA loci are significantly enriched for DNA looping interactions with gene promoters as well as genomic and epigenetic characteristics of transcriptional enhancers. Functional studies of additional lnc-pri-miRNA loci demonstrated cognate miRNA-independent enhancer-like activity. Together, these data demonstrate that lnc-pri-miRNA loci can regulate cell biology via both miRNA-dependent and miRNA-independent mechanisms.
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Affiliation(s)
- Daniel He
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Developmental and Stem Cell Biology Graduate Program, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
| | - David Wu
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Medical Scientist Training Program, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
| | - Soren Muller
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
| | - Lin Wang
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
| | - Parna Saha
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Department of Surgery, San Francisco Veterans Affairs Medical Center, San Francisco, CA 94121
| | - Sajad Hamid Ahanger
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Department of Surgery, San Francisco Veterans Affairs Medical Center, San Francisco, CA 94121
| | - Siyuan John Liu
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Medical Scientist Training Program, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
| | - Miao Cui
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
| | - Sung Jun Hong
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Developmental and Stem Cell Biology Graduate Program, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
| | - Miten Jain
- Department of Biomolecular Engineering, University of California, Santa Cruz, CA 95064
- UCSC Genomics Institute, University of California, Santa Cruz, CA 95064
| | - Hugh E Olson
- Department of Biomolecular Engineering, University of California, Santa Cruz, CA 95064
- UCSC Genomics Institute, University of California, Santa Cruz, CA 95064
| | - Mark Akeson
- Department of Biomolecular Engineering, University of California, Santa Cruz, CA 95064
- UCSC Genomics Institute, University of California, Santa Cruz, CA 95064
| | - Joseph F Costello
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
| | - Aaron Diaz
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
| | - Daniel A Lim
- Department of Neurological Surgery, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143;
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Biomedical Sciences Graduate Program, University of California, San Francisco, CA 94143
- Department of Surgery, San Francisco Veterans Affairs Medical Center, San Francisco, CA 94121
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14
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WD40 Repeat Protein 26 Negatively Regulates Formyl Peptide Receptor-1 Mediated Wound Healing in Intestinal Epithelial Cells. THE AMERICAN JOURNAL OF PATHOLOGY 2020; 190:2029-2038. [PMID: 32958140 DOI: 10.1016/j.ajpath.2020.06.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/26/2020] [Accepted: 06/05/2020] [Indexed: 11/22/2022]
Abstract
N-formyl peptide receptors (FPRs) serve as phagocyte pattern-recognition receptors that play a crucial role in the regulation of host defense against infection. Epithelial cells also express FPRs, and their activation during inflammation or injury results in enhanced epithelial migration and proliferation and improved mucosal wound repair. However, signaling mechanisms that govern epithelial FPR1 activity are not well understood. This study identified a novel FPR1-interacting protein, WD40 repeat protein (WDR)-26, which negatively regulates FPR1-mediated wound healing in intestinal epithelial cells. We show that WDR26-mediated inhibition of wound repair is mediated through the inhibition of Rac family small GTPase 1 and cell division cycle 42 activation, as well as downstream intracellular reactive oxygen species production. Furthermore, on FPR1 activation with N-formyl-methionyl-leucyl phenylalanine, WDR26 dissociates from FPR1, resulting in the activation of downstream cell division cycle 42/Rac family small GTPase 1 signaling, increased epithelial cell migration, and mucosal wound repair. These findings elucidate a novel regulatory function of WDR26 in FPR1-mediated wound healing in intestinal epithelial cells.
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15
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Recognition of nonproline N-terminal residues by the Pro/N-degron pathway. Proc Natl Acad Sci U S A 2020; 117:14158-14167. [PMID: 32513738 DOI: 10.1073/pnas.2007085117] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Eukaryotic N-degron pathways are proteolytic systems whose unifying feature is their ability to recognize proteins containing N-terminal (Nt) degradation signals called N-degrons, and to target these proteins for degradation by the 26S proteasome or autophagy. GID4, a subunit of the GID ubiquitin ligase, is the main recognition component of the proline (Pro)/N-degron pathway. GID4 targets proteins through their Nt-Pro residue or a Pro at position 2, in the presence of specific downstream sequence motifs. Here we show that human GID4 can also recognize hydrophobic Nt-residues other than Pro. One example is the sequence Nt-IGLW, bearing Nt-Ile. Nt-IGLW binds to wild-type human GID4 with a K d of 16 μM, whereas the otherwise identical Nt-Pro-bearing sequence PGLW binds to GID4 more tightly, with a K d of 1.9 μM. Despite this difference in affinities of GID4 for Nt-IGLW vs. Nt-PGLW, we found that the GID4-mediated Pro/N-degron pathway of the yeast Saccharomyces cerevisiae can target an Nt-IGLW-bearing protein for rapid degradation. We solved crystal structures of human GID4 bound to a peptide bearing Nt-Ile or Nt-Val. We also altered specific residues of human GID4 and measured the affinities of resulting mutant GID4s for Nt-IGLW and Nt-PGLW, thereby determining relative contributions of specific GID4 residues to the GID4-mediated recognition of Nt-Pro vs. Nt-residues other than Pro. These and related results advance the understanding of targeting by the Pro/N-degron pathway and greatly expand the substrate recognition range of the GID ubiquitin ligase in both human and yeast cells.
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16
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D'Amico F, Nadalin F, Libra M. S100A7/Ran-binding protein 9 coevolution in mammals. Immunogenetics 2020; 72:155-164. [PMID: 32043173 DOI: 10.1007/s00251-020-01155-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 01/13/2020] [Indexed: 10/25/2022]
Abstract
S100A7 has been suggested to interact with Ran-binding protein 9. Both proteins are nowadays considered key effectors in immune response. Functional interaction between proteins is ensured by coevolution. The mechanisms of vertebrate coevolution between S100A7 and RanBP9 remain unclear. Several approaches for studying coevolution have been developed. Protein coevolution was inferred by calculating the linear correlation coefficients between inter-protein distance matrices using Mirrortree. We found an overall moderate correlation value (R = 0.53, p < 1e-06). Moreover, owing to the high conservation of RanBP9 protein among vertebrates, we chose to utilize a recent version of Blocks in Sequences (BIS2) algorithm implemented in BIS2Analyzer webserver. A coevolution cluster was identified between the two proteins (p < 8.10e-05). In conclusion, our coevolutionary analysis suggests that amino acid variations may modulate S100A7/RanBP9 interaction with potential pathogenic effects. Such findings could guide further analysis to better elucidate the function of S100A7 and RanBP9 and to design drugs targeting for these molecules in diseases.
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Affiliation(s)
- Fabio D'Amico
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy.
| | - Francesca Nadalin
- Laboratoire de Biologie Computationnelle et Quantitative (LCQB) - UMR 7238, Sorbonne Université, Univ P6, CNRS, IBPS, Paris, France
| | - Massimo Libra
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
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17
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Chen SJ, Melnykov A, Varshavsky A. Evolution of Substrates and Components of the Pro/N-Degron Pathway. Biochemistry 2020; 59:582-593. [PMID: 31895557 DOI: 10.1021/acs.biochem.9b00953] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Gid4, a subunit of the ubiquitin ligase GID, is the recognition component of the Pro/N-degron pathway. Gid4 targets proteins in particular through their N-terminal (Nt) proline (Pro) residue. In Saccharomyces cerevisiae and other Saccharomyces yeasts, the gluconeogenic enzymes Fbp1, Icl1, and Mdh2 bear Nt-Pro and are conditionally destroyed by the Pro/N-degron pathway. However, in mammals and in many non-Saccharomyces yeasts, for example, in Kluyveromyces lactis, these enzymes lack Nt-Pro. We used K. lactis to explore evolution of the Pro/N-degron pathway. One question to be addressed was whether the presence of non-Pro Nt residues in K. lactis Fbp1, Icl1, and Mdh2 was accompanied, on evolutionary time scales (S. cerevisiae and K. lactis diverged ∼150 million years ago), by a changed specificity of the Gid4 N-recognin. We used yeast-based two-hybrid binding assays and protein-degradation assays to show that the non-Pro (Ala) Nt residue of K. lactis Fbp1 makes this enzyme long-lived in K. lactis. We also found that the replacement, through mutagenesis, of Nt-Ala and the next three residues of K. lactis Fbp1 with the four-residue Nt-PTLV sequence of S. cerevisiae Fbp1 sufficed to make the resulting "hybrid" Fbp1 a short-lived substrate of Gid4 in K. lactis. We consider a blend of quasi-neutral genetic drift and natural selection that can account for these and related results. To the best of our knowledge, this work is the first study of the ubiquitin system in K. lactis, including development of the first protein-degradation assay (based on the antibiotic blasticidin) suitable for use with this organism.
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Affiliation(s)
- Shun-Jia Chen
- Division of Biology and Biological Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Artem Melnykov
- Division of Biology and Biological Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Alexander Varshavsky
- Division of Biology and Biological Engineering , California Institute of Technology , Pasadena , California 91125 , United States
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18
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Interconversion between Anticipatory and Active GID E3 Ubiquitin Ligase Conformations via Metabolically Driven Substrate Receptor Assembly. Mol Cell 2020; 77:150-163.e9. [DOI: 10.1016/j.molcel.2019.10.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 09/04/2019] [Accepted: 10/08/2019] [Indexed: 12/20/2022]
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19
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Tessari A, Soliman SHA, Orlacchio A, Capece M, Amann JM, Visone R, Carbone DP, Palmieri D, Coppola V. RANBP9 as potential therapeutic target in non-small cell lung cancer. JOURNAL OF CANCER METASTASIS AND TREATMENT 2020; 6. [PMID: 34778565 PMCID: PMC8589326 DOI: 10.20517/2394-4722.2020.32] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Non-small cell lung cancer (NSCLC) remains the leading cause of cancer-related deaths in the Western world. Despite progress made with targeted therapies and immune checkpoint inhibitors, the vast majority of patients have to undergo chemotherapy with platinum-based drugs. To increase efficacy and reduce potential side effects, a more comprehensive understanding of the mechanisms of the DNA damage response (DDR) is required. We have shown that overexpressby live cell imaging (Incuyion of the scaffold protein RAN binding protein 9 (RANBP9) is pervasive in NSCLC. More importantly, patients with higher levels of RANBP9 exhibit a worse outcome from treatment with platinum-based drugs. Mechanistically, RANBP9 exists as a target and an enabler of the ataxia telangiectasia mutated (ATM) kinase signaling. Indeed, the depletion of RANBP9 in NSCLC cells abates ATM activation and its downstream targets such as pby live cell imaging (Incuy53 signaling. RANBP9 knockout cells are more sensitive than controls to the inhibition of the ataxia and telangiectasia-related (ATR) kinase but not to ATM inhibition. The absence of RANBP9 renders cells more sensitive to drugs inhibiting the Poly(ADP-ribose)-Polymerase (PARP) resulting in a "BRCAness-like" phenotype. In summary, as a result of increased sensitivity to DNA damaging drugs conferred by its ablation in vitro and in vivo, RANBP9 may be considered as a potential target for the treatment of NSCLC. This article aims to report the results from past and ongoing investigations focused on the role of RANBP9 in the response to DNA damage, particularly in the context of NSCLC. This review concludes with future directions and speculative remarks which will need to be addressed in the coming years.
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Affiliation(s)
- Anna Tessari
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
| | - Shimaa H A Soliman
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA.,Department of Medicine, Dentistry and Biotechnology, G. d'Annunzio University of Chieti, Chieti 66100, Italy.,Current address: Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Arturo Orlacchio
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
| | - Marina Capece
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
| | - Joseph M Amann
- Current address: Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Rosa Visone
- Department of Medicine, Dentistry and Biotechnology, G. d'Annunzio University of Chieti, Chieti 66100, Italy
| | - David P Carbone
- Division of Medical Oncology, Department of Internal Medicine, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
| | - Dario Palmieri
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
| | - Vincenzo Coppola
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
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20
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Nobre LV, Nightingale K, Ravenhill BJ, Antrobus R, Soday L, Nichols J, Davies JA, Seirafian S, Wang ECY, Davison AJ, Wilkinson GWG, Stanton RJ, Huttlin EL, Weekes MP. Human cytomegalovirus interactome analysis identifies degradation hubs, domain associations and viral protein functions. eLife 2019; 8:e49894. [PMID: 31873071 PMCID: PMC6959991 DOI: 10.7554/elife.49894] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 12/24/2019] [Indexed: 02/07/2023] Open
Abstract
Human cytomegalovirus (HCMV) extensively modulates host cells, downregulating >900 human proteins during viral replication and degrading ≥133 proteins shortly after infection. The mechanism of degradation of most host proteins remains unresolved, and the functions of many viral proteins are incompletely characterised. We performed a mass spectrometry-based interactome analysis of 169 tagged, stably-expressed canonical strain Merlin HCMV proteins, and two non-canonical HCMV proteins, in infected cells. This identified a network of >3400 virus-host and >150 virus-virus protein interactions, providing insights into functions for multiple viral genes. Domain analysis predicted binding of the viral UL25 protein to SH3 domains of NCK Adaptor Protein-1. Viral interacting proteins were identified for 31/133 degraded host targets. Finally, the uncharacterised, non-canonical ORFL147C protein was found to interact with elements of the mRNA splicing machinery, and a mutational study suggested its importance in viral replication. The interactome data will be important for future studies of herpesvirus infection.
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Affiliation(s)
- Luis V Nobre
- Cambridge Institute for Medical ResearchUniversity of CambridgeCambridgeUnited Kingdom
| | - Katie Nightingale
- Cambridge Institute for Medical ResearchUniversity of CambridgeCambridgeUnited Kingdom
| | - Benjamin J Ravenhill
- Cambridge Institute for Medical ResearchUniversity of CambridgeCambridgeUnited Kingdom
| | - Robin Antrobus
- Cambridge Institute for Medical ResearchUniversity of CambridgeCambridgeUnited Kingdom
| | - Lior Soday
- Cambridge Institute for Medical ResearchUniversity of CambridgeCambridgeUnited Kingdom
| | - Jenna Nichols
- MRC-University of Glasgow Centre for Virus ResearchGlasgowUnited Kingdom
| | - James A Davies
- Division of Infection and ImmunityCardiff University School of MedicineCardiffUnited Kingdom
| | - Sepehr Seirafian
- Division of Infection and ImmunityCardiff University School of MedicineCardiffUnited Kingdom
| | - Eddie CY Wang
- Division of Infection and ImmunityCardiff University School of MedicineCardiffUnited Kingdom
| | - Andrew J Davison
- MRC-University of Glasgow Centre for Virus ResearchGlasgowUnited Kingdom
| | - Gavin WG Wilkinson
- Division of Infection and ImmunityCardiff University School of MedicineCardiffUnited Kingdom
| | - Richard J Stanton
- Division of Infection and ImmunityCardiff University School of MedicineCardiffUnited Kingdom
| | - Edward L Huttlin
- Department of Cell BiologyHarvard Medical SchoolBostonUnited States
| | - Michael P Weekes
- Cambridge Institute for Medical ResearchUniversity of CambridgeCambridgeUnited Kingdom
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21
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Liu H, Ding J, Köhnlein K, Urban N, Ori A, Villavicencio-Lorini P, Walentek P, Klotz LO, Hollemann T, Pfirrmann T. The GID ubiquitin ligase complex is a regulator of AMPK activity and organismal lifespan. Autophagy 2019; 16:1618-1634. [PMID: 31795790 PMCID: PMC8386601 DOI: 10.1080/15548627.2019.1695399] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The AMP-activated protein kinase (AMPK) regulates cellular energy homeostasis by sensing the metabolic status of the cell. AMPK is regulated by phosphorylation and dephosphorylation as a result of changing AMP/ATP levels and by removal of inhibitory ubiquitin residues by USP10. In this context, we identified the GID-complex, an evolutionarily conserved ubiquitin-ligase-complex (E3), as a negative regulator of AMPK activity. Our data show that the GID-complex targets AMPK for ubiquitination thereby altering its activity. Cells depleted of GID-subunits mimic a state of starvation as shown by increased AMPK activity and macroautophagic/autophagic flux as well as reduced MTOR activation. Consistently, gid-genes knockdown in C. elegans results in increased organismal lifespan. This study may contribute to understand metabolic disorders such as type 2 diabetes mellitus and morbid obesity and implements alternative therapeutic approaches to alter AMPK activity.
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Affiliation(s)
- Huaize Liu
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg , Halle, Germany
| | - Jie Ding
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg , Halle, Germany
| | - Karl Köhnlein
- Institute of Nutritional Sciences, Friedrich Schiller University Jena , Jena, Germany
| | - Nadine Urban
- Institute of Nutritional Sciences, Friedrich Schiller University Jena , Jena, Germany
| | - Alessandro Ori
- Leibniz Institute on Aging, Fritz Lipmann Institute (FLI) , Jena, Germany
| | | | - Peter Walentek
- Division of Genetics, Genomics and Development, Molecular and Cell Biology Department, University of California at Berkeley , Berkeley, USA.,Internal Medicine IV, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg , Germany.,CIBSS - Center for Integrative Biological Signalling Studies, Albert Ludwigs University , Freiburg, Germany
| | - Lars-Oliver Klotz
- Institute of Nutritional Sciences, Friedrich Schiller University Jena , Jena, Germany
| | - Thomas Hollemann
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg , Halle, Germany
| | - Thorsten Pfirrmann
- Institute of Physiological Chemistry, Martin-Luther University Halle-Wittenberg , Halle, Germany
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22
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The CTLH Complex in Cancer Cell Plasticity. JOURNAL OF ONCOLOGY 2019; 2019:4216750. [PMID: 31885576 PMCID: PMC6907057 DOI: 10.1155/2019/4216750] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/24/2019] [Accepted: 10/25/2019] [Indexed: 12/12/2022]
Abstract
Cancer cell plasticity is the ability of cancer cells to intermittently morph into different fittest phenotypic states. Due to the intrinsic capacity to change their composition and interactions, protein macromolecular complexes are the ideal instruments for transient transformation. This review focuses on a poorly studied mammalian macromolecular complex called the CTLH (carboxy-terminal to LisH) complex. Currently, this macrostructure includes 11 known members (ARMC8, GID4, GID8, MAEA, MKLN1, RMND5A, RMND5B, RANBP9, RANBP10, WDR26, and YPEL5) and it has been shown to have E3-ligase enzymatic activity. CTLH proteins have been linked to all fundamental biological processes including proliferation, survival, programmed cell death, cell adhesion, and migration. At molecular level, the complex seems to interact and intertwine with key signaling pathways such as the PI3-kinase, WNT, TGFβ, and NFκB, which are key to cancer cell plasticity. As a whole, the CTLH complex is overexpressed in the most prevalent types of cancer and may hold the key to unlock many of the biological secrets that allow cancer cells to thrive in harsh conditions and resist antineoplastic therapy.
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23
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Melnykov A, Chen SJ, Varshavsky A. Gid10 as an alternative N-recognin of the Pro/N-degron pathway. Proc Natl Acad Sci U S A 2019; 116:15914-15923. [PMID: 31337681 PMCID: PMC6689949 DOI: 10.1073/pnas.1908304116] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
In eukaryotes, N-degron pathways (formerly "N-end rule pathways") comprise a set of proteolytic systems whose unifying feature is their ability to recognize proteins containing N-terminal degradation signals called N-degrons, thereby causing degradation of these proteins by the 26S proteasome or autophagy. Gid4, a subunit of the GID ubiquitin ligase in the yeast Saccharomyces cerevisiae, is the recognition component (N-recognin) of the GID-mediated Pro/N-degron pathway. Gid4 targets proteins by recognizing their N-terminal Pro residues or a Pro at position 2, in the presence of distinct adjoining sequence motifs. Under conditions of low or absent glucose, cells make it through gluconeogenesis. When S. cerevisiae grows on a nonfermentable carbon source, its gluconeogenic enzymes Fbp1, Icl1, Mdh2, and Pck1 are expressed and long-lived. Transition to a medium containing glucose inhibits the synthesis of these enzymes and induces their degradation by the Gid4-dependent Pro/N-degron pathway. While studying yeast Gid4, we identified a similar but uncharacterized yeast protein (YGR066C), which we named Gid10. A screen for N-terminal peptide sequences that can bind to Gid10 showed that substrate specificities of Gid10 and Gid4 overlap but are not identical. Gid10 is not expressed under usual (unstressful) growth conditions, but is induced upon starvation or osmotic stresses. Using protein binding analyses and degradation assays with substrates of GID, we show that Gid10 can function as a specific N-recognin of the Pro/N-degron pathway.
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Affiliation(s)
- Artem Melnykov
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125
| | - Shun-Jia Chen
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125
| | - Alexander Varshavsky
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125
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24
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The mammalian CTLH complex is an E3 ubiquitin ligase that targets its subunit muskelin for degradation. Sci Rep 2019; 9:9864. [PMID: 31285494 PMCID: PMC6614414 DOI: 10.1038/s41598-019-46279-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 06/17/2019] [Indexed: 12/15/2022] Open
Abstract
The multi-subunit C-terminal to LisH (CTLH) complex is the mammalian homologue of the yeast Gid E3 ubiquitin ligase complex. In this study, we investigated the human CTLH complex and characterized its E3 ligase activity. We confirm that the complex immunoprecipitated from human cells comprises RanBPM, ARMC8 α/β, muskelin, WDR26, GID4 and the RING domain proteins RMND5A and MAEA. We find that loss of expression of individual subunits compromises the stability of other complex members and that MAEA and RMND5A protein levels are interdependent. Using in vitro ubiquitination assays, we demonstrate that the CTLH complex has E3 ligase activity which is dependent on RMND5A and MAEA. We report that the complex can pair with UBE2D1, UBE2D2 and UBE2D3 E2 enzymes and that recombinant RMND5A mediates K48 and K63 poly-ubiquitin chains. Finally, we show a proteasome-dependent increase in the protein levels of CTLH complex member muskelin in RMND5A KO cells. Furthermore, muskelin ubiquitination is dependent on RMND5A, suggesting that it may be a target of the complex. Overall, we further the characterization of the CTLH complex as an E3 ubiquitin ligase complex in human cells and reveal a potential autoregulation mechanism.
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25
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Regulation of c-Raf Stability through the CTLH Complex. Int J Mol Sci 2019; 20:ijms20040934. [PMID: 30795516 PMCID: PMC6412545 DOI: 10.3390/ijms20040934] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 02/14/2019] [Indexed: 12/23/2022] Open
Abstract
c-Raf is a central component of the extracellular signal-regulated kinase (ERK) pathway which is implicated in the development of many cancer types. RanBPM (Ran-Binding Protein M) was previously shown to inhibit c-Raf expression, but how this is achieved remains unclear. RanBPM is part of a recently identified E3 ubiquitin ligase complex, the CTLH (C-terminal to LisH) complex. Here, we show that the CTLH complex regulates c-Raf expression through a control of its degradation. Several domains of RanBPM were found necessary to regulate c-Raf levels, but only the C-terminal CRA (CT11-RanBPM) domain showed direct interaction with c-Raf. c-Raf ubiquitination and degradation is promoted by the CTLH complex. Furthermore, A-Raf and B-Raf protein levels are also regulated by the CTLH complex, indicating a common regulation of Raf family members. Finally, depletion of CTLH subunits RMND5A (required for meiotic nuclear division 5A) and RanBPM resulted in enhanced proliferation and loss of RanBPM promoted tumour growth in a mouse model. This study uncovers a new mode of control of c-Raf expression through regulation of its degradation by the CTLH complex. These findings also uncover a novel target of the CTLH complex, and suggest that the CTLH complex has activities that suppress cell transformation and tumour formation.
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26
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Salemi LM, Maitland MER, McTavish CJ, Schild-Poulter C. Cell signalling pathway regulation by RanBPM: molecular insights and disease implications. Open Biol 2018; 7:rsob.170081. [PMID: 28659384 PMCID: PMC5493780 DOI: 10.1098/rsob.170081] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2017] [Accepted: 06/01/2017] [Indexed: 12/25/2022] Open
Abstract
RanBPM (Ran-binding protein M, also called RanBP9) is an evolutionarily conserved, ubiquitous protein which localizes to both nucleus and cytoplasm. RanBPM has been implicated in the regulation of a number of signalling pathways to regulate several cellular processes such as apoptosis, cell adhesion, migration as well as transcription, and plays a critical role during development. In addition, RanBPM has been shown to regulate pathways implicated in cancer and Alzheimer's disease, implying that RanBPM has important functions in both normal and pathological development. While its functions in these processes are still poorly understood, RanBPM has been identified as a component of a large complex, termed the CTLH (C-terminal to LisH) complex. The yeast homologue of this complex functions as an E3 ubiquitin ligase that targets enzymes of the gluconeogenesis pathway. While the CTLH complex E3 ubiquitin ligase activity and substrates still remain to be characterized, the high level of conservation between the complexes in yeast and mammals infers that the CTLH complex could also serve to promote the degradation of specific substrates through ubiquitination, therefore suggesting the possibility that RanBPM's various functions may be mediated through the activity of the CTLH complex.
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Affiliation(s)
- Louisa M Salemi
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
| | - Matthew E R Maitland
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
| | - Christina J McTavish
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
| | - Caroline Schild-Poulter
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
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27
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Menssen R, Bui K, Wolf DH. Regulation of the Gid ubiquitin ligase recognition subunit Gid4. FEBS Lett 2018; 592:3286-3294. [DOI: 10.1002/1873-3468.13229] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 08/08/2018] [Accepted: 08/15/2018] [Indexed: 11/05/2022]
Affiliation(s)
- Ruth Menssen
- Department of Biochemistry Institute of Biochemistry and Technical Biochemistry Stuttgart University Germany
| | - Kim Bui
- Department of Biochemistry Institute of Biochemistry and Technical Biochemistry Stuttgart University Germany
| | - Dieter H. Wolf
- Department of Biochemistry Institute of Biochemistry and Technical Biochemistry Stuttgart University Germany
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28
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Leal-Esteban LC, Rothé B, Fortier S, Isenschmid M, Constam DB. Role of Bicaudal C1 in renal gluconeogenesis and its novel interaction with the CTLH complex. PLoS Genet 2018; 14:e1007487. [PMID: 29995892 PMCID: PMC6056059 DOI: 10.1371/journal.pgen.1007487] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 07/23/2018] [Accepted: 06/13/2018] [Indexed: 01/06/2023] Open
Abstract
Altered glucose and lipid metabolism fuel cystic growth in polycystic kidneys, but the cause of these perturbations is unclear. Renal cysts also associate with mutations in Bicaudal C1 (Bicc1) or in its self-polymerizing sterile alpha motif (SAM). Here, we found that Bicc1 maintains normoglycemia and the expression of the gluconeogenic enzymes FBP1 and PEPCK in kidneys. A proteomic screen revealed that Bicc1 interacts with the C-Terminal to Lis-Homology domain (CTLH) complex. Since the orthologous Gid complex in S. cerevisae targets FBP1 and PEPCK for degradation, we mapped the topology among CTLH subunits and found that SAM-mediated binding controls Bicc1 protein levels, whereas Bicc1 inhibited the accumulation of several CTLH subunits. Under the conditions analyzed, Bicc1 increased FBP1 protein levels independently of the CTLH complex. Besides linking Bicc1 to cell metabolism, our findings reveal new layers of complexity in the regulation of renal gluconeogenesis compared to lower eukaryotes. Polycystic kidney diseases (PKD) are incurable inherited chronic disorders marked by fluid-filled cysts that frequently cause renal failure. A glycolytic metabolism reminiscent of cancerous cells accelerates cystic growth, but the mechanism underlying such metabolic re-wiring is poorly understood. PKD-like cystic kidneys also develop in mice that lack the RNA-binding protein Bicaudal-C (Bicc1), and mutations in a single copy of human BICC1 associate with renal cystic dysplasia. Here, we report that Bicc1 regulates renal gluconeogenesis. A screen for interacting factors revealed that Bicc1 binds the C-Terminal to Lis-Homology domain (CTLH) complex, which in lower eukaryotes mediates degradation of gluconeogenic enzymes. By contrast, Bicc1 and the mammalian CTLH complex regulated each other, and Bicc1 stimulated the accumulation of the rate-limiting gluconeogenic enzyme even in cells depleted of CTLH subunits. Our finding that Bicc1 is required for normoglycemia implies that renal gluconeogenesis may be important to inhibit cyst formation.
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Affiliation(s)
- Lucia Carolina Leal-Esteban
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Sciences, Swiss Institute for Experimental Cancer Research (ISREC), Lausanne, Switzerland
| | - Benjamin Rothé
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Sciences, Swiss Institute for Experimental Cancer Research (ISREC), Lausanne, Switzerland
| | - Simon Fortier
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Sciences, Swiss Institute for Experimental Cancer Research (ISREC), Lausanne, Switzerland
| | - Manuela Isenschmid
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Sciences, Swiss Institute for Experimental Cancer Research (ISREC), Lausanne, Switzerland
| | - Daniel B. Constam
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Sciences, Swiss Institute for Experimental Cancer Research (ISREC), Lausanne, Switzerland
- * E-mail:
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29
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Wolf DH, Menssen R. Mechanisms of cell regulation - proteolysis, the big surprise. FEBS Lett 2018; 592:2515-2524. [PMID: 29790175 DOI: 10.1002/1873-3468.13109] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 05/16/2018] [Accepted: 05/17/2018] [Indexed: 11/09/2022]
Abstract
Precise regulation of cellular processes is essential for life. Regarding proteins, many regulatory mechanisms were explored over the years, such as posttranslational modifications (e.g., phosphorylation), enzyme activation or inhibition by small molecules, and modulation of protein-protein interactions. Complete removal of a protein via proteolysis as a regulatory mechanism, however, was denied for a long time, mainly due to economical considerations. Scientists could not believe that a protein which is synthesized at the expense of a lot of energy could be destroyed again. Here, we discuss the landmark discoveries and the use of yeast as a eukaryotic model organism that finally paved the way for our current understanding of proteolysis as an essential regulatory principle in the cell.
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Affiliation(s)
- Dieter H Wolf
- Department of Biochemistry, Institute of Biochemistry and Technical Biochemistry, Stuttgart University, Germany
| | - Ruth Menssen
- Department of Biochemistry, Institute of Biochemistry and Technical Biochemistry, Stuttgart University, Germany
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30
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Lampert F, Stafa D, Goga A, Soste MV, Gilberto S, Olieric N, Picotti P, Stoffel M, Peter M. The multi-subunit GID/CTLH E3 ubiquitin ligase promotes cell proliferation and targets the transcription factor Hbp1 for degradation. eLife 2018; 7:35528. [PMID: 29911972 PMCID: PMC6037477 DOI: 10.7554/elife.35528] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 06/16/2018] [Indexed: 12/17/2022] Open
Abstract
In yeast, the glucose-induced degradation-deficient (GID) E3 ligase selectively degrades superfluous gluconeogenic enzymes. Here, we identified all subunits of the mammalian GID/CTLH complex and provide a comprehensive map of its hierarchical organization and step-wise assembly. Biochemical reconstitution demonstrates that the mammalian complex possesses inherent E3 ubiquitin ligase activity, using Ube2H as its cognate E2. Deletions of multiple GID subunits compromise cell proliferation, and this defect is accompanied by deregulation of critical cell cycle markers such as the retinoblastoma (Rb) tumor suppressor, phospho-Histone H3 and Cyclin A. We identify the negative regulator of pro-proliferative genes Hbp1 as a bonafide GID/CTLH proteolytic substrate. Indeed, Hbp1 accumulates in cells lacking GID/CTLH activity, and Hbp1 physically interacts and is ubiquitinated in vitro by reconstituted GID/CTLH complexes. Our biochemical and cellular analysis thus demonstrates that the GID/CTLH complex prevents cell cycle exit in G1, at least in part by degrading Hbp1.
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Affiliation(s)
| | - Diana Stafa
- Institute of Biochemistry, ETH Zürich, Zürich, Switzerland
| | - Algera Goga
- Institute of Molecular Health Sciences, ETH Zürich, Zürich, Switzerland
| | | | | | - Natacha Olieric
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institute, Villigen, Switzerland
| | - Paola Picotti
- Institute of Biochemistry, ETH Zürich, Zürich, Switzerland
| | - Markus Stoffel
- Institute of Molecular Health Sciences, ETH Zürich, Zürich, Switzerland
| | - Matthias Peter
- Institute of Biochemistry, ETH Zürich, Zürich, Switzerland
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31
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Shah VJ, Maddika S. CRL7 SMU1 E3 ligase complex-driven H2B ubiquitylation functions in sister chromatid cohesion by regulating SMC1 expression. J Cell Sci 2018; 131:jcs.213868. [PMID: 29507117 DOI: 10.1242/jcs.213868] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 02/26/2018] [Indexed: 12/26/2022] Open
Abstract
Cullin-RING-type E3 ligases (CRLs) control a broad range of biological processes by ubiquitylating numerous cellular substrates. However, the role of CRL E3 ligases in chromatid cohesion is unknown. In this study, we identified a new CRL-type E3 ligase (designated as CRL7SMU1 complex) that has an essential role in the maintenance of chromatid cohesion. We demonstrate that SMU1, DDB1, CUL7 and RNF40 are integral components of this complex. SMU1, by acting as a substrate recognition module, binds to H2B and mediates monoubiquitylation at the lysine (K) residue K120 through CRL7SMU1 E3 ligase complex. Depletion of CRL7SMU1 leads to loss of H2B ubiquitylation at the SMC1a locus and, thus, subsequently compromised SMC1a expression in cells. Knockdown of CRL7SMU1 components or loss of H2B ubiquitylation leads to defective sister chromatid cohesion, which is rescued by restoration of SMC1a expression. Together, our results unveil an important role of CRL7SMU1 E3 ligase in promoting H2B ubiquitylation for maintenance of sister chromatid cohesion during mitosis.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Varun Jayeshkumar Shah
- Laboratory of Cell Death & Cell Survival, Centre for DNA Fingerprinting and Diagnostics, Hyderabad, India-500 039.,Graduate studies, Manipal Academy of Higher Education, Manipal, India-576 104
| | - Subbareddy Maddika
- Laboratory of Cell Death & Cell Survival, Centre for DNA Fingerprinting and Diagnostics, Hyderabad, India-500 039
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de Araujo TS, Almeida MS. 1H, 13C and 15N chemical shift assignment of lissencephaly-1 homology (LisH) domain homodimer of human two-hybrid-associated protein 1 with RanBPM (Twa1). BIOMOLECULAR NMR ASSIGNMENTS 2018; 12:99-102. [PMID: 29067546 DOI: 10.1007/s12104-017-9787-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 10/20/2017] [Indexed: 06/07/2023]
Abstract
The CTLH complex is a large, highly conserved eukaryotic complex composed of eight proteins that has been associated to several cellular functions, more often described as an E3 ubiquitin ligase complex involved in protein degradation through ubiquitination but also via vacuole-dependent degradation. A common feature observed in several components of this complex is the presence of the domains lissencephaly-1 homology (LisH) and C-terminal to LisH (CTLH). The LisH domain is found in several proteins involved in chromosome segregation, microtubule dynamics, and cell migration. Also, this domain participates in protein dimerization, besides affecting protein half-life, and influencing in specific cellular localization. Among the proteins found in the CTLH complex, Twa1 (Two-hybrid-associated protein 1 with RanBPM), also known as Gid8 (glucose-induced degradation protein 8 homolog) is the smallest, being a good model for structural studies by NMR. In this work we report the chemical shift assignments of the homodimeric LisH domain of Twa1, as a first step to determine its solution structure.
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Affiliation(s)
- Talita S de Araujo
- Instituto de Bioquímica Médica Leopoldo de Meis, Centro Nacional de Biologia Estrutural e Bioimagem (CENABIO), Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marcius S Almeida
- Instituto de Bioquímica Médica Leopoldo de Meis, Centro Nacional de Biologia Estrutural e Bioimagem (CENABIO), Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
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Chen B. A novel long noncoding RNA lncWDR26 suppresses the growth and metastasis of hepatocellular carcinoma cells through interaction with SIX3. Am J Cancer Res 2018; 8:688-698. [PMID: 29736313 PMCID: PMC5934558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 11/01/2017] [Indexed: 06/08/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is the third leading cause of cancer-related deaths worldwide. Long noncoding RNAs (lncRNAs) are involved in the tumorigenesis and progression of some cancers. However, only a handful of lncRNAs have been functionally identified in HCC. In the present study, we identified a novel functional lncRNA in HCC, termed lncWDR26 (GenBank Accession no. RP11-365O16). Here, we reported that lncWDR26 was significantly downregulated in HCC tissues and cells. Moreover, decreased lncWDR26 expression correlates with larger tumor size, higher clinical stage, and tumor metastasis, and also predicts poor prognosis in patients with HCC. In HCC cells, overexpression of lncWDR26 inhibited growth and metastasis, both in vitro and in vivo. Mechanistically, lncWDR26 suppressed HCC growth and metastasis by inhibiting WDR26 transcription. Notably, lncWDR26 was associated with SIX homeobox 3 (SIX3), and this association was required for the repression of WDR26 transcription. Together, these results indicate that lncWDR26 is a tumor suppressor lncRNA that promotes tumor progression, leading us to propose that lncRNAs may serve as key regulatory hubs in HCC progression.
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Affiliation(s)
- Baosheng Chen
- Department of Second General Surgery, Hebei Cangzhou Central Hospital Cangzhou 061000, Heibei Province, China
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Bauer A, Jagannathan V, Högler S, Richter B, McEwan NA, Thomas A, Cadieu E, André C, Hytönen MK, Lohi H, Welle MM, Roosje P, Mellersh C, Casal ML, Leeb T. MKLN1 splicing defect in dogs with lethal acrodermatitis. PLoS Genet 2018; 14:e1007264. [PMID: 29565995 PMCID: PMC5863938 DOI: 10.1371/journal.pgen.1007264] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 02/21/2018] [Indexed: 12/31/2022] Open
Abstract
Lethal acrodermatitis (LAD) is a genodermatosis with monogenic autosomal recessive inheritance in Bull Terriers and Miniature Bull Terriers. The LAD phenotype is characterized by poor growth, immune deficiency, and skin lesions, especially at the paws. Utilizing a combination of genome wide association study and haplotype analysis, we mapped the LAD locus to a critical interval of ~1.11 Mb on chromosome 14. Whole genome sequencing of an LAD affected dog revealed a splice region variant in the MKLN1 gene that was not present in 191 control genomes (chr14:5,731,405T>G or MKLN1:c.400+3A>C). This variant showed perfect association in a larger combined Bull Terrier/Miniature Bull Terrier cohort of 46 cases and 294 controls. The variant was absent from 462 genetically diverse control dogs of 62 other dog breeds. RT-PCR analysis of skin RNA from an affected and a control dog demonstrated skipping of exon 4 in the MKLN1 transcripts of the LAD affected dog, which leads to a shift in the MKLN1 reading frame. MKLN1 encodes the widely expressed intracellular protein muskelin 1, for which diverse functions in cell adhesion, morphology, spreading, and intracellular transport processes are discussed. While the pathogenesis of LAD remains unclear, our data facilitate genetic testing of Bull Terriers and Miniature Bull Terriers to prevent the unintentional production of LAD affected dogs. This study may provide a starting point to further clarify the elusive physiological role of muskelin 1 in vivo. Lethal acrodermatitis (LAD) is an autosomal recessive hereditary disease in dogs. It is characterized by poor growth, immune deficiency and characteristic skin lesions of the paws and of the face. We mapped the LAD locus to a ~1.11 Mb segment on canine chromosome 14. Whole genome sequence data of an LAD affected dog and 191 controls revealed a candidate causative variant in the MKLN1 gene, encoding muskelin 1. The identified variant, a single nucleotide substitution, MKLN1:c.400+3A>C, altered the 5’-splice site at the beginning of intron 4. We experimentally confirmed that this variant leads to complete skipping of exon 4 in the MKLN1 mRNA in skin. Various cellular functions have been postulated for muskelin 1 including roles in intracellular transport processes, cell morphology, cell spreading, and cell adhesion. Our data from dogs reveal a novel in vivo role for muskelin 1 that is related to the immune system and skin. MKLN1 thus represents a novel candidate gene for human patients with unsolved acrodermatitis and/or immune deficiency phenotypes. LAD affected dogs may serve as models to gain more insights into the function of muskelin 1.
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Affiliation(s)
- Anina Bauer
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, University of Bern, Bern, Switzerland
| | - Vidhya Jagannathan
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, University of Bern, Bern, Switzerland
| | - Sandra Högler
- Department of Pathobiology, Institute of Pathology and Forensic Veterinary Medicine, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Barbara Richter
- Department of Pathobiology, Institute of Pathology and Forensic Veterinary Medicine, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Neil A. McEwan
- Department of Small Animal Clinical Sciences, The University of Liverpool, Leahurst Campus, Neston, Cheshire, United Kingdom
| | - Anne Thomas
- Antagene, Animal Genetics Laboratory, La Tour de Salvagny, France
| | - Edouard Cadieu
- Institut de Génétique et Développement de Rennes (IGDR), CNRS-UMR6290, Université Rennes1, Rennes, France
| | - Catherine André
- Institut de Génétique et Développement de Rennes (IGDR), CNRS-UMR6290, Université Rennes1, Rennes, France
| | - Marjo K. Hytönen
- Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
- Research Programs Unit, Molecular Neurology, University of Helsinki, Helsinki, Finland
- Folkhälsan Institute of Genetics, University of Helsinki, Helsinki, Finland
| | - Hannes Lohi
- Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
- Research Programs Unit, Molecular Neurology, University of Helsinki, Helsinki, Finland
- Folkhälsan Institute of Genetics, University of Helsinki, Helsinki, Finland
| | - Monika M. Welle
- DermFocus, University of Bern, Bern, Switzerland
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Petra Roosje
- DermFocus, University of Bern, Bern, Switzerland
- Division of Clinical Dermatology, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern,Bern, Switzerland
| | - Cathryn Mellersh
- Kennel Club Genetics Centre, Animal Health Trust, Kentford, Newmarket, Suffolk, United Kingdom
| | - Margret L. Casal
- Section of Medical Genetics, Department of Clinical Sciences & Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Tosso Leeb
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, University of Bern, Bern, Switzerland
- * E-mail:
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Götze M, Dufourt J, Ihling C, Rammelt C, Pierson S, Sambrani N, Temme C, Sinz A, Simonelig M, Wahle E. Translational repression of the Drosophila nanos mRNA involves the RNA helicase Belle and RNA coating by Me31B and Trailer hitch. RNA (NEW YORK, N.Y.) 2017; 23:1552-1568. [PMID: 28701521 PMCID: PMC5602113 DOI: 10.1261/rna.062208.117] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 07/10/2017] [Indexed: 05/10/2023]
Abstract
Translational repression of maternal mRNAs is an essential regulatory mechanism during early embryonic development. Repression of the Drosophila nanos mRNA, required for the formation of the anterior-posterior body axis, depends on the protein Smaug binding to two Smaug recognition elements (SREs) in the nanos 3' UTR. In a comprehensive mass spectrometric analysis of the SRE-dependent repressor complex, we identified Smaug, Cup, Me31B, Trailer hitch, eIF4E, and PABPC, in agreement with earlier data. As a novel component, the RNA-dependent ATPase Belle (DDX3) was found, and its involvement in deadenylation and repression of nanos was confirmed in vivo. Smaug, Cup, and Belle bound stoichiometrically to the SREs, independently of RNA length. Binding of Me31B and Tral was also SRE-dependent, but their amounts were proportional to the length of the RNA and equimolar to each other. We suggest that "coating" of the RNA by a Me31B•Tral complex may be at the core of repression.
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Affiliation(s)
- Michael Götze
- Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, 06099 Halle, Germany
| | - Jérémy Dufourt
- Institute of Human Genetics, UMR9002 CNRS-University of Montpellier, 34396 Montpellier Cedex 5, France
| | - Christian Ihling
- Institute of Pharmacy, Martin Luther University Halle-Wittenberg, 06099 Halle, Germany
| | - Christiane Rammelt
- Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, 06099 Halle, Germany
| | - Stephanie Pierson
- Institute of Human Genetics, UMR9002 CNRS-University of Montpellier, 34396 Montpellier Cedex 5, France
| | - Nagraj Sambrani
- Institute of Human Genetics, UMR9002 CNRS-University of Montpellier, 34396 Montpellier Cedex 5, France
| | - Claudia Temme
- Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, 06099 Halle, Germany
| | - Andrea Sinz
- Institute of Pharmacy, Martin Luther University Halle-Wittenberg, 06099 Halle, Germany
| | - Martine Simonelig
- Institute of Human Genetics, UMR9002 CNRS-University of Montpellier, 34396 Montpellier Cedex 5, France
| | - Elmar Wahle
- Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, 06099 Halle, Germany
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36
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Salemi LM, Maitland MER, Yefet ER, Schild-Poulter C. Inhibition of HDAC6 activity through interaction with RanBPM and its associated CTLH complex. BMC Cancer 2017; 17:460. [PMID: 28668087 PMCID: PMC5494137 DOI: 10.1186/s12885-017-3430-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 06/13/2017] [Indexed: 12/13/2022] Open
Abstract
Background Histone deacetylase 6 (HDAC6) is a microtubule-associated deacetylase that promotes many cellular processes that lead to cell transformation and tumour development. We previously documented an interaction between Ran-Binding Protein M (RanBPM) and HDAC6 and found that RanBPM expression inhibits HDAC6 activity. RanBPM is part of a putative E3 ubiquitin ligase complex, termed the C-terminal to LisH (CTLH) complex. Here, we investigated the involvement of the CTLH complex on HDAC6 inhibition and assessed the outcome of this regulation on the cellular motility induced by HDAC6. Methods Cell lines (Hela, HEK293 and immortalized mouse embryonic fibroblasts) stably or transiently downregulated for several components of the CTLH complex were employed for the assays used in this study. Interactions of HDAC6, RanBPM and muskelin were assessed by co-immunoprecipitations. Quantifications of western blot analyses were employed to evaluate acetylated α-tubulin levels. Confocal microscopy analyses were used to determine microtubule association of HDAC6 and CTLH complex members. Cell migration was evaluated using wound healing assays. Results We demonstrate that RanBPM-mediated inhibition of HDAC6 is dependent on its association with HDAC6. We show that, while HDAC6 does not require RanBPM to associate with microtubules, RanBPM association with microtubules requires HDAC6. Additionally, we show that Twa1 (Two-hybrid-associated protein 1 with RanBPM) and MAEA (Macrophage Erythroblast Attacher), two CTLH complex members, also associate with α-tubulin and that muskelin, another component of the CTLH complex, is able to associate with HDAC6. Downregulation of CTLH complex members muskelin and Rmnd5A (Required for meiotic nuclear division homolog A) resulted in decreased acetylation of HDAC6 substrate α-tubulin. Finally, we demonstrate that the increased cell migration resulting from downregulation of RanBPM is due to the relief in inhibition of HDAC6 α-tubulin deacetylase activity. Conclusions Our work shows that RanBPM, together with the CTLH complex, associates with HDAC6 and restricts cell migration through inhibition of HDAC6 activity. This study uncovers a novel function for the CTLH complex and suggests that it could have a tumour suppressive role in restricting HDAC6 oncogenic properties. Electronic supplementary material The online version of this article (doi:10.1186/s12885-017-3430-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Louisa M Salemi
- Robarts Research Institute and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, ON, N6A 5B7, Canada
| | - Matthew E R Maitland
- Robarts Research Institute and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, ON, N6A 5B7, Canada
| | - Eyal R Yefet
- Robarts Research Institute and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, ON, N6A 5B7, Canada
| | - Caroline Schild-Poulter
- Robarts Research Institute and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, ON, N6A 5B7, Canada.
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Shimizu K, Okamoto M, Terada T, Sakurai F, Mizuguchi H, Tomita K, Nishinaka T. Adenovirus vector-mediated macrophage erythroblast attacher (MAEA) overexpression in primary mouse hepatocytes attenuates hepatic gluconeogenesis. Biochem Biophys Rep 2017; 10:192-197. [PMID: 28955747 PMCID: PMC5614675 DOI: 10.1016/j.bbrep.2017.04.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 12/27/2016] [Accepted: 04/18/2017] [Indexed: 11/30/2022] Open
Abstract
Japanese patients with type 2 diabetes mellitus present a different responsiveness in terms of insulin secretion to glucose and body mass index (BMI) from other populations. The genetic background that predisposes Japanese individuals to type 2 diabetes mellitus is under study. Recent genetic studies demonstrated that the locus mapped in macrophage erythroblast attacher (MAEA) increases the susceptibility to type 2 diabetes mellitus in East Asians, including Japanese individuals. MAEA encodes a protein that plays a role in erythroblast enucleation and in the normal differentiation of erythroid cells and macrophages. However, the contribution of MAEA to type 2 diabetes mellitus remains unknown. In this study, to overexpress MAEA in the mouse liver and primary mouse hepatocytes, we generated a MAEA-expressing adenovirus (Ad) vector using a novel Ad vector exhibiting significantly lower hepatotoxicity (Ad-MAEA). Blood glucose and insulin levels in Ad-MAEA-treated mice were comparable to those in control Ad-treated mice. Primary mouse hepatocytes transduced with Ad-MAEA showed lower levels of expression of gluconeogenesis genes than those transduced with the control Ad vector. Hepatocyte nuclear factor-4α (HNF-4α) mRNA expression in primary mouse hepatocytes was also suppressed by MAEA overexpression. These results suggest that MAEA overexpression attenuates hepatic gluconeogenesis, which could potentially lead to improvement of type 2 diabetes mellitus.
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Affiliation(s)
- Kahori Shimizu
- Laboratory of Biochemistry, Faculty of Pharmacy, Osaka Ohtani University, Osaka 584-8540, Japan
| | - Minako Okamoto
- Laboratory of Biochemistry, Faculty of Pharmacy, Osaka Ohtani University, Osaka 584-8540, Japan
| | - Tomoyuki Terada
- Laboratory of Biochemistry, Faculty of Pharmacy, Osaka Ohtani University, Osaka 584-8540, Japan
| | - Fuminori Sakurai
- Laboratory of Biochemistry and Molecular Biology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka 565-0871, Japan.,Laboratory of Regulatory Sciences for Oligonucleotide Therapeutics, Clinical Drug Development Unit, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka 565-0871, Japan
| | - Hiroyuki Mizuguchi
- Laboratory of Biochemistry and Molecular Biology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka 565-0871, Japan.,Global Center for Medical Engineering and Informatics, Osaka University, Osaka 565-0871, Japan.,Laboratory of Hepatocyte Differentiation, National Institutes of Biomedical Innovation, Health and Nutrition, Osaka 567-0085, Japan.,iPS Cell-Based Research Project on Hepatic Toxicity and Metabolism, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka 565-0871, Japan
| | - Koji Tomita
- Laboratory of Molecular Biology, Faculty of Pharmacy, Osaka Ohtani University, Osaka 584-8540, Japan
| | - Toru Nishinaka
- Laboratory of Biochemistry, Faculty of Pharmacy, Osaka Ohtani University, Osaka 584-8540, Japan
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Gul IS, Hulpiau P, Saeys Y, van Roy F. Metazoan evolution of the armadillo repeat superfamily. Cell Mol Life Sci 2017; 74:525-541. [PMID: 27497926 PMCID: PMC11107757 DOI: 10.1007/s00018-016-2319-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 07/05/2016] [Accepted: 07/25/2016] [Indexed: 02/08/2023]
Abstract
The superfamily of armadillo repeat proteins is a fascinating archetype of modular-binding proteins involved in various fundamental cellular processes, including cell-cell adhesion, cytoskeletal organization, nuclear import, and molecular signaling. Despite their diverse functions, they all share tandem armadillo (ARM) repeats, which stack together to form a conserved three-dimensional structure. This superhelical armadillo structure enables them to interact with distinct partners by wrapping around them. Despite the important functional roles of this superfamily, a comprehensive analysis of the composition, classification, and phylogeny of this protein superfamily has not been reported. Furthermore, relatively little is known about a subset of ARM proteins, and some of the current annotations of armadillo repeats are incomplete or incorrect, often due to high similarity with HEAT repeats. We identified the entire armadillo repeat superfamily repertoire in the human genome, annotated each armadillo repeat, and performed an extensive evolutionary analysis of the armadillo repeat proteins in both metazoan and premetazoan species. Phylogenetic analyses of the superfamily classified them into several discrete branches with members showing significant sequence homology, and often also related functions. Interestingly, the phylogenetic structure of the superfamily revealed that about 30 % of the members predate metazoans and represent an ancient subset, which is gradually evolving to acquire complex and highly diverse functions.
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Affiliation(s)
- Ismail Sahin Gul
- Inflammation Research Center (IRC), VIB, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, FSVM Building, Technologiepark 927, 9052, Ghent, Belgium
| | - Paco Hulpiau
- Inflammation Research Center (IRC), VIB, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, FSVM Building, Technologiepark 927, 9052, Ghent, Belgium
| | - Yvan Saeys
- Inflammation Research Center (IRC), VIB, Ghent, Belgium
- Department of Respiratory Medicine, Ghent University, Ghent, Belgium
| | - Frans van Roy
- Inflammation Research Center (IRC), VIB, Ghent, Belgium.
- Department of Biomedical Molecular Biology, Ghent University, FSVM Building, Technologiepark 927, 9052, Ghent, Belgium.
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Chen SJ, Wu X, Wadas B, Oh JH, Varshavsky A. An N-end rule pathway that recognizes proline and destroys gluconeogenic enzymes. Science 2017; 355:eaal3655. [PMID: 28126757 PMCID: PMC5457285 DOI: 10.1126/science.aal3655] [Citation(s) in RCA: 150] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 12/14/2016] [Indexed: 01/07/2023]
Abstract
Cells synthesize glucose if deprived of it, and destroy gluconeogenic enzymes upon return to glucose-replete conditions. We found that the Gid4 subunit of the ubiquitin ligase GID in the yeast Saccharomyces cerevisiae targeted the gluconeogenic enzymes Fbp1, Icl1, and Mdh2 for degradation. Gid4 recognized the N-terminal proline (Pro) residue and the ~5-residue-long adjacent sequence motifs. Pck1, the fourth gluconeogenic enzyme, contains Pro at position 2; Gid4 directly or indirectly recognized Pro at position 2 of Pck1, contributing to its targeting. These and related results identified Gid4 as the recognition component of the GID-based proteolytic system termed the Pro/N-end rule pathway. Substrates of this pathway include gluconeogenic enzymes that bear either the N-terminal Pro residue or a Pro at position 2, together with adjacent sequence motifs.
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Affiliation(s)
- Shun-Jia Chen
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Xia Wu
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Brandon Wadas
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Jang-Hyun Oh
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Alexander Varshavsky
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
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40
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Studies of recombinant TWA1 reveal constitutive dimerization. Biosci Rep 2017; 37:BSR20160401. [PMID: 27920276 PMCID: PMC5234100 DOI: 10.1042/bsr20160401] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 11/25/2016] [Accepted: 12/05/2016] [Indexed: 01/06/2023] Open
Abstract
The mammalian muskelin/RanBP9/C-terminal to LisH (CTLH) complex and the Saccharomyces cerevisiae glucose-induced degradation (GID) complex are large, multi-protein complexes that each contain a RING E3 ubiquitin ligase. The yeast GID complex acts to degrade a key enzyme of gluconeogenesis, fructose 1,6-bisphosphatase, under conditions of abundant fermentable carbon sources. However, the assembly and functions of the mammalian complex remain poorly understood. A striking feature of these complexes is the presence of multiple proteins that contain contiguous lissencephaly-1 homology (LisH), CTLH and C-terminal CT11-RanBP9 (CRA) domains. TWA1/Gid8, the smallest constituent protein of these complexes, consists only of LisH, CTLH and CRA domains and is highly conserved in eukaryotes. Towards better knowledge of the role of TWA1 in these multi-protein complexes, we established a method for bacterial expression and purification of mouse TWA1 that yields tag-free, recombinant TWA1 in quantities suitable for biophysical and biochemical studies. CD spectroscopy of recombinant TWA1 indicated a predominantly α-helical protein. Gel filtration chromatography, size-exclusion chromatography (SEC) with multi-angle light scattering (SEC-MALS) and native PAGE demonstrated a propensity of untagged TWA1 to form stable dimers and, to a lesser extent, higher order oligomers. TWA1 has a single cysteine residue, Cys139, yet the dimeric form was preserved when TWA1 was purified in the presence of the reducing agent tris(2-carboxyethyl)phosphine (TCEP). These findings have implications for understanding the molecular role of TWA1 in the yeast GID complex and related multi-protein E3 ubiquitin ligases identified in other eukaryotes.
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Characterization of Novel Molecular Mechanisms Favoring Rac1 Membrane Translocation. PLoS One 2016; 11:e0166715. [PMID: 27835684 PMCID: PMC5105943 DOI: 10.1371/journal.pone.0166715] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Accepted: 11/02/2016] [Indexed: 11/19/2022] Open
Abstract
The Rac1 GTPase plays key roles in cytoskeletal organization, cell motility and a variety of physiological and disease-linked responses. Wild type Rac1 signaling entails dissociation of the GTPase from cytosolic Rac1-Rho GDP dissociation inhibitor (GDI) complexes, translocation to membranes, activation by exchange factors, effector binding, and activation of downstream signaling cascades. Out of those steps, membrane translocation is the less understood. Using transfections of a expression cDNA library in cells expressing a Rac1 bioreporter, we previously identified a cytoskeletal feedback loop nucleated by the F-actin binding protein coronin 1A (Coro1A) that promotes Rac1 translocation to the plasma membrane by facilitating the Pak-dependent dissociation of Rac1-Rho GDI complexes. This screening identified other potential regulators of this process, including WDR26, basigin, and TMEM8A. Here, we show that WDR26 promotes Rac1 translocation following a Coro1A-like and Coro1A-dependent mechanism. By contrast, basigin and TMEM8A stabilize Rac1 at the plasma membrane by inhibiting the internalization of caveolin-rich membrane subdomains. This latter pathway is F-actin-dependent but Coro1A-, Pak- and Rho GDI-independent.
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Boldt K, van Reeuwijk J, Lu Q, Koutroumpas K, Nguyen TMT, Texier Y, van Beersum SEC, Horn N, Willer JR, Mans DA, Dougherty G, Lamers IJC, Coene KLM, Arts HH, Betts MJ, Beyer T, Bolat E, Gloeckner CJ, Haidari K, Hetterschijt L, Iaconis D, Jenkins D, Klose F, Knapp B, Latour B, Letteboer SJF, Marcelis CL, Mitic D, Morleo M, Oud MM, Riemersma M, Rix S, Terhal PA, Toedt G, van Dam TJP, de Vrieze E, Wissinger Y, Wu KM, Apic G, Beales PL, Blacque OE, Gibson TJ, Huynen MA, Katsanis N, Kremer H, Omran H, van Wijk E, Wolfrum U, Kepes F, Davis EE, Franco B, Giles RH, Ueffing M, Russell RB, Roepman R. An organelle-specific protein landscape identifies novel diseases and molecular mechanisms. Nat Commun 2016; 7:11491. [PMID: 27173435 PMCID: PMC4869170 DOI: 10.1038/ncomms11491] [Citation(s) in RCA: 183] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 04/01/2016] [Indexed: 01/12/2023] Open
Abstract
Cellular organelles provide opportunities to relate biological mechanisms to disease. Here we use affinity proteomics, genetics and cell biology to interrogate cilia: poorly understood organelles, where defects cause genetic diseases. Two hundred and seventeen tagged human ciliary proteins create a final landscape of 1,319 proteins, 4,905 interactions and 52 complexes. Reverse tagging, repetition of purifications and statistical analyses, produce a high-resolution network that reveals organelle-specific interactions and complexes not apparent in larger studies, and links vesicle transport, the cytoskeleton, signalling and ubiquitination to ciliary signalling and proteostasis. We observe sub-complexes in exocyst and intraflagellar transport complexes, which we validate biochemically, and by probing structurally predicted, disruptive, genetic variants from ciliary disease patients. The landscape suggests other genetic diseases could be ciliary including 3M syndrome. We show that 3M genes are involved in ciliogenesis, and that patient fibroblasts lack cilia. Overall, this organelle-specific targeting strategy shows considerable promise for Systems Medicine. Mutations in proteins that localize to primary cilia cause devastating diseases, yet the primary cilium is a poorly understood organelle. Here the authors use interaction proteomics to identify a network of human ciliary proteins that provides new insights into several biological processes and diseases.
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Affiliation(s)
- Karsten Boldt
- Medical Proteome Center, Institute for Ophthalmic Research, University of Tuebingen, 72074 Tuebingen, Germany
| | - Jeroen van Reeuwijk
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Qianhao Lu
- Biochemie Zentrum Heidelberg (BZH), University of Heidelberg, Im Neuenheimer Feld 328, 69120 Heidelberg, Germany.,Cell Networks, Bioquant, Ruprecht-Karl University of Heidelberg, Im Neuenheimer Feld 267, 69120 Heidelberg, Germany
| | - Konstantinos Koutroumpas
- Institute of Systems and Synthetic Biology, Genopole, CNRS, Université d'Evry, 91030 Evry, France
| | - Thanh-Minh T Nguyen
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Yves Texier
- Medical Proteome Center, Institute for Ophthalmic Research, University of Tuebingen, 72074 Tuebingen, Germany.,Department of Molecular Epigenetics, Helmholtz Center Munich, Center for Integrated Protein Science, 81377 Munich, Germany
| | - Sylvia E C van Beersum
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Nicola Horn
- Medical Proteome Center, Institute for Ophthalmic Research, University of Tuebingen, 72074 Tuebingen, Germany
| | - Jason R Willer
- Center for Human Disease Modeling, Duke University, Durham, North Carolina 27701, USA
| | - Dorus A Mans
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Gerard Dougherty
- Department of General Pediatrics, University Children's Hospital Muenster, 48149 Muenster, Germany
| | - Ideke J C Lamers
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Karlien L M Coene
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Heleen H Arts
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Matthew J Betts
- Biochemie Zentrum Heidelberg (BZH), University of Heidelberg, Im Neuenheimer Feld 328, 69120 Heidelberg, Germany.,Cell Networks, Bioquant, Ruprecht-Karl University of Heidelberg, Im Neuenheimer Feld 267, 69120 Heidelberg, Germany
| | - Tina Beyer
- Medical Proteome Center, Institute for Ophthalmic Research, University of Tuebingen, 72074 Tuebingen, Germany
| | - Emine Bolat
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Christian Johannes Gloeckner
- German Center for Neurodegenerative Diseases (DZNE) within the Helmholz Association, Otfried-Müller Strasse 23, 72076 Tuebingen, Germany
| | - Khatera Haidari
- Department of Nephrology and Hypertension, Regenerative Medicine Center, University Medical Center Utrecht, 3584 CT Utrecht, The Netherlands
| | - Lisette Hetterschijt
- Department of Otorhinolaryngology and Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Daniela Iaconis
- Telethon Institute of Genetics and Medicine, TIGEM 80078, Italy
| | - Dagan Jenkins
- Molecular Medicine Unit and Birth Defects Research Centre, UCL Institute of Child Health, London, WC1N 1EH, UK
| | - Franziska Klose
- Medical Proteome Center, Institute for Ophthalmic Research, University of Tuebingen, 72074 Tuebingen, Germany
| | - Barbara Knapp
- Cell and Matrix Biology, Inst. of Zoology, Johannes Gutenberg University of Mainz, 55122 Mainz, Germany
| | - Brooke Latour
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Stef J F Letteboer
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Carlo L Marcelis
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Dragana Mitic
- Cambridge Cell Networks Ltd, St John's Innovation Centre, Cowley Road, Cambridge, CB4 0WS, UK
| | - Manuela Morleo
- Telethon Institute of Genetics and Medicine, TIGEM 80078, Italy.,Department of Translational Medicine Federico II University, 80131 Naples, Italy
| | - Machteld M Oud
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Moniek Riemersma
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Susan Rix
- Molecular Medicine Unit and Birth Defects Research Centre, UCL Institute of Child Health, London, WC1N 1EH, UK
| | - Paulien A Terhal
- Department of Genetics, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands
| | - Grischa Toedt
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Teunis J P van Dam
- Centre for Molecular and Biomolecular Informatics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 26-28, 6525 GA Nijmegen, The Netherlands
| | - Erik de Vrieze
- Department of Otorhinolaryngology and Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Yasmin Wissinger
- Medical Proteome Center, Institute for Ophthalmic Research, University of Tuebingen, 72074 Tuebingen, Germany
| | - Ka Man Wu
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Gordana Apic
- Cambridge Cell Networks Ltd, St John's Innovation Centre, Cowley Road, Cambridge, CB4 0WS, UK
| | - Philip L Beales
- Molecular Medicine Unit and Birth Defects Research Centre, UCL Institute of Child Health, London, WC1N 1EH, UK
| | - Oliver E Blacque
- School of Biomolecular &Biomed Science, Conway Institute, University College Dublin, Dublin 4, Ireland
| | - Toby J Gibson
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Martijn A Huynen
- Centre for Molecular and Biomolecular Informatics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 26-28, 6525 GA Nijmegen, The Netherlands
| | - Nicholas Katsanis
- Center for Human Disease Modeling, Duke University, Durham, North Carolina 27701, USA
| | - Hannie Kremer
- Department of Otorhinolaryngology and Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Heymut Omran
- Department of General Pediatrics, University Children's Hospital Muenster, 48149 Muenster, Germany
| | - Erwin van Wijk
- Department of Otorhinolaryngology and Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Uwe Wolfrum
- Cell and Matrix Biology, Inst. of Zoology, Johannes Gutenberg University of Mainz, 55122 Mainz, Germany
| | - François Kepes
- Institute of Systems and Synthetic Biology, Genopole, CNRS, Université d'Evry, 91030 Evry, France
| | - Erica E Davis
- Center for Human Disease Modeling, Duke University, Durham, North Carolina 27701, USA
| | - Brunella Franco
- Telethon Institute of Genetics and Medicine, TIGEM 80078, Italy.,Department of Translational Medicine Federico II University, 80131 Naples, Italy
| | - Rachel H Giles
- Department of Nephrology and Hypertension, Regenerative Medicine Center, University Medical Center Utrecht, 3584 CT Utrecht, The Netherlands
| | - Marius Ueffing
- Medical Proteome Center, Institute for Ophthalmic Research, University of Tuebingen, 72074 Tuebingen, Germany
| | - Robert B Russell
- Biochemie Zentrum Heidelberg (BZH), University of Heidelberg, Im Neuenheimer Feld 328, 69120 Heidelberg, Germany.,Cell Networks, Bioquant, Ruprecht-Karl University of Heidelberg, Im Neuenheimer Feld 267, 69120 Heidelberg, Germany
| | - Ronald Roepman
- Department of Human Genetics and Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
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43
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Goto T, Matsuzawa J, Iemura SI, Natsume T, Shibuya H. WDR26 is a new partner of Axin1 in the canonical Wnt signaling pathway. FEBS Lett 2016; 590:1291-303. [PMID: 27098453 PMCID: PMC5084729 DOI: 10.1002/1873-3468.12180] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 03/25/2016] [Accepted: 04/05/2016] [Indexed: 01/19/2023]
Abstract
The stability of β‐catenin is very important for canonical Wnt signaling. A protein complex including Axin/APC/GSK3β phosphorylates β‐catenin to be degraded by ubiquitination with β‐TrCP. In the recent study, we isolated WDR26, a protein that binds to Axin. Here, we found that WDR26 is a negative regulator of the canonical Wnt signaling pathway, and that WDR26 affected β‐catenin levels. In addition, WDR26/Axin binding is involved in the ubiquitination of β‐catenin. These results suggest that WDR26 plays a negative role in β‐catenin degradation in the Wnt signaling pathway.
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Affiliation(s)
- Toshiyasu Goto
- Department of Molecular Cell Biology, Medical Research Institute, Tokyo Medical and Dental University, Japan
| | - Junhei Matsuzawa
- Department of Molecular Cell Biology, Medical Research Institute, Tokyo Medical and Dental University, Japan
| | - Shun-Ichiro Iemura
- Molecular Profiling Research Center for Drug Discovery, National Institutes of Advanced Industrial Science and Technology, Tokyo, Japan
| | - Tohru Natsume
- Molecular Profiling Research Center for Drug Discovery, National Institutes of Advanced Industrial Science and Technology, Tokyo, Japan
| | - Hiroshi Shibuya
- Department of Molecular Cell Biology, Medical Research Institute, Tokyo Medical and Dental University, Japan
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44
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Axin cancer mutants form nanoaggregates to rewire the Wnt signaling network. Nat Struct Mol Biol 2016; 23:324-32. [DOI: 10.1038/nsmb.3191] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 02/12/2016] [Indexed: 12/20/2022]
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45
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Zhao Y, Peng S, Jia C, Xu F, Xu Y, Dai C. Armc8 regulates the invasive ability of hepatocellular carcinoma through E-cadherin/catenin complex. Tumour Biol 2016; 37:11219-24. [PMID: 26944057 DOI: 10.1007/s13277-016-5006-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 02/25/2016] [Indexed: 11/28/2022] Open
Abstract
Armc8 (armadillo-repeat-containing protein 8) was proved to promote disruption of E-cadherin complex through regulating α-catenin degradation. In this study, we investigated Armc8 expression in hepatocellular carcinoma using immunohistochemistry (IHC). The positive rate of Armc8 expression in hepatocellular carcinoma was 53.9 % and higher than that in normal hepatic tissues (9.2 %) (p < 0.05). Clinicopathological analysis shows that Armc8 expression in hepatocellular carcinoma was significantly associated with larger tumor size (≥5 cm), multiple tumor numbers, higher pathological grade (media and poor), advanced TNM stages (II/III), and advanced BCLC stages (B/C). Western blot study also detected higher Armc8 expression in hepatocellular carcinoma cells including HepG2, HCC97L, and SMMC-7721 than in human hepatic cell Bel-7402. We further use specific small interfering RNAs (siRNAs) to knock down Armc8 expression in HepG2 cells and found that knockdown of Armc8 expression significantly inhibited the invasive ability of HepG2 cells. Downregulation of Armc8 expression significantly upregulated α-catenin, β-catenin, and E-cadherin expression in HepG2 cells. Immunofluorescent study shows that knockdown of Armc8 expression restored E-cadherin expression in membrane of HepG2 cells. These results indicate that Armc8 may be a potential cancer marker in hepatocellular carcinoma and may regulate cancer invasion through E-cadherin/catenin complex.
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Affiliation(s)
- Yang Zhao
- Department of Hepatobiliary and Spleenary Surgery, The Affiliated Shengjing Hospital, China Medical University, 110004, Shenyang, China
| | - Songlin Peng
- Department of Hepatobiliary and Spleenary Surgery, The Affiliated Shengjing Hospital, China Medical University, 110004, Shenyang, China
| | - Changjun Jia
- Department of Hepatobiliary and Spleenary Surgery, The Affiliated Shengjing Hospital, China Medical University, 110004, Shenyang, China
| | - Feng Xu
- Department of Hepatobiliary and Spleenary Surgery, The Affiliated Shengjing Hospital, China Medical University, 110004, Shenyang, China
| | - Yongqing Xu
- Department of Hepatobiliary and Spleenary Surgery, The Affiliated Shengjing Hospital, China Medical University, 110004, Shenyang, China
| | - Chaoliu Dai
- Department of Hepatobiliary and Spleenary Surgery, The Affiliated Shengjing Hospital, China Medical University, 110004, Shenyang, China.
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46
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Pfirrmann T, Villavicencio-Lorini P, Subudhi AK, Menssen R, Wolf DH, Hollemann T. RMND5 from Xenopus laevis is an E3 ubiquitin-ligase and functions in early embryonic forebrain development. PLoS One 2015; 10:e0120342. [PMID: 25793641 PMCID: PMC4368662 DOI: 10.1371/journal.pone.0120342] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 01/22/2015] [Indexed: 12/19/2022] Open
Abstract
In Saccharomyces cerevisiae the Gid-complex functions as an ubiquitin-ligase complex that regulates the metabolic switch between glycolysis and gluconeogenesis. In higher organisms six conserved Gid proteins form the CTLH protein-complex with unknown function. Here we show that Rmnd5, the Gid2 orthologue from Xenopus laevis, is an ubiquitin-ligase embedded in a high molecular weight complex. Expression of rmnd5 is strongest in neuronal ectoderm, prospective brain, eyes and ciliated cells of the skin and its suppression results in malformations of the fore- and midbrain. We therefore suggest that Xenopus laevis Rmnd5, as a subunit of the CTLH complex, is a ubiquitin-ligase targeting an unknown factor for polyubiquitination and subsequent proteasomal degradation for proper fore- and midbrain development.
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Affiliation(s)
- Thorsten Pfirrmann
- Martin-Luther University Halle-Wittenberg, Institute of Physiological Chemistry, Halle, Germany
- * E-mail:
| | | | - Abinash K. Subudhi
- Martin-Luther University Halle-Wittenberg, Institute of Physiological Chemistry, Halle, Germany
| | - Ruth Menssen
- University of Stuttgart, Institute of Biochemistry, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Dieter H. Wolf
- University of Stuttgart, Institute of Biochemistry, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Thomas Hollemann
- Martin-Luther University Halle-Wittenberg, Institute of Physiological Chemistry, Halle, Germany
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47
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Salemi LM, Loureiro SO, Schild-Poulter C. Characterization of RanBPM molecular determinants that control its subcellular localization. PLoS One 2015; 10:e0117655. [PMID: 25659156 PMCID: PMC4319831 DOI: 10.1371/journal.pone.0117655] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Accepted: 12/30/2014] [Indexed: 12/14/2022] Open
Abstract
RanBPM/RanBP9 is a ubiquitous, nucleocytoplasmic protein that is part of an evolutionary conserved E3 ubiquitin ligase complex whose function and targets in mammals are still unknown. RanBPM itself has been implicated in various cellular processes that involve both nuclear and cytoplasmic functions. However, to date, little is known about how RanBPM subcellular localization is regulated. We have conducted a systematic analysis of RanBPM regions that control its subcellular localization using RanBPM shRNA cells to examine ectopic RanBPM mutant subcellular localization without interference from the endogenously expressed protein. We show that several domains and motifs regulate RanBPM nuclear and cytoplasmic localization. In particular, RanBPM comprises two motifs that can confer nuclear localization, one proline/glutamine-rich motif in the extreme N-terminus which has a dominant effect on RanBPM localization, and a second motif in the C-terminus which minimally contributes to RanBPM nuclear targeting. We also identified a nuclear export signal (NES) which mutation prevented RanBPM accumulation in the cytoplasm. Likewise, deletion of the central RanBPM conserved domains (SPRY and LisH/CTLH) resulted in the relocalization of RanBPM to the nucleus, suggesting that RanBPM cytoplasmic localization is also conferred by protein-protein interactions that promote its cytoplasmic retention. Indeed we found that in the cytoplasm, RanBPM partially colocalizes with microtubules and associates with α-tubulin. Finally, in the nucleus, a significant fraction of RanBPM is associated with chromatin. Altogether, these analyses reveal that RanBPM subcellular localization results from the combined effects of several elements that either confer direct transport through the nucleocytoplasmic transport machinery or regulate it indirectly, likely through interactions with other proteins and by intramolecular folding.
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Affiliation(s)
- Louisa M. Salemi
- Robarts Research Institute and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, Ontario, Canada
| | - Sandra O. Loureiro
- Robarts Research Institute and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, Ontario, Canada
| | - Caroline Schild-Poulter
- Robarts Research Institute and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, Ontario, Canada
- * E-mail:
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48
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Delto CF, Heisler FF, Kuper J, Sander B, Kneussel M, Schindelin H. The LisH motif of muskelin is crucial for oligomerization and governs intracellular localization. Structure 2015; 23:364-73. [PMID: 25579817 DOI: 10.1016/j.str.2014.11.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 11/06/2014] [Accepted: 11/18/2014] [Indexed: 12/21/2022]
Abstract
Neurons regulate the number of surface receptors by balancing the transport to and from the plasma membrane to adjust their signaling properties. The protein muskelin was recently identified as a key factor guiding the transport of α1 subunit-containing GABAA receptors. Here we present the crystal structure of muskelin, comprising its N-terminal discoidin domain and Lis1-homology (LisH) motif. The molecule crystallized as a dimer with the LisH motif exclusively mediating oligomerization. Our subsequent biochemical analyses confirmed that the LisH motif acts as a dimerization element in muskelin. Together with an intermolecular head-to-tail interaction, the LisH-dependent dimerization is required to assemble a muskelin tetramer. Intriguingly, our cellular studies revealed that the loss of this dimerization results in a complete redistribution of muskelin from the cytoplasm to the nucleus and impairs muskelin's function in GABAA receptor transport. These studies demonstrate that the LisH-dependent dimerization is a crucial factor for muskelin function.
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Affiliation(s)
- Carolyn F Delto
- Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, D-97080 Würzburg, Germany
| | - Frank F Heisler
- Center for Molecular Neurobiology, ZMNH, University Medical Center Hamburg-Eppendorf, D-20251 Hamburg, Germany
| | - Jochen Kuper
- Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, D-97080 Würzburg, Germany
| | - Bodo Sander
- Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, D-97080 Würzburg, Germany
| | - Matthias Kneussel
- Center for Molecular Neurobiology, ZMNH, University Medical Center Hamburg-Eppendorf, D-20251 Hamburg, Germany
| | - Hermann Schindelin
- Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, D-97080 Würzburg, Germany.
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49
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Kim KH, Hong SK, Hwang KY, Kim EE. Structure of mouse muskelin discoidin domain and biochemical characterization of its self-association. ACTA ACUST UNITED AC 2014; 70:2863-74. [PMID: 25372678 DOI: 10.1107/s139900471401894x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 08/21/2014] [Indexed: 01/29/2023]
Abstract
Muskelin is an intracellular kelch-repeat protein comprised of discoidin, LisH, CTLH and kelch-repeat domains. It is involved in cell adhesion and the regulation of cytoskeleton dynamics as well as being a component of a putative E3 ligase complex. Here, the first crystal structure of mouse muskelin discoidin domain (MK-DD) is reported at 1.55 Å resolution, which reveals a distorted eight-stranded β-barrel with two short α-helices at one end of the barrel. Interestingly, the N- and C-termini are not linked by the disulfide bonds found in other eukaryotic discoidin structures. A highly conserved MIND motif appears to be the determinant for MK-DD specific interaction together with the spike loops. Analysis of interdomain interaction shows that MK-DD binds the kelch-repeat domain directly and that this interaction depends on the presence of the LisH domain.
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Affiliation(s)
- Kook Han Kim
- Biomedical Research Institute, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Seung Kon Hong
- Biomedical Research Institute, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Kwang Yeon Hwang
- Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, 145 Anam-ro, Seoul 136-701, Republic of Korea
| | - Eunice EunKyeong Kim
- Biomedical Research Institute, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
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