1
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Wu X, Zhang L, Liu C, Cheng Q, Zhao W, Chen P, Qin Y, Chen M. The NS2B-PP1α-eIF2α axis: Inhibiting stress granule formation and Boosting Zika virus replication. PLoS Pathog 2024; 20:e1012355. [PMID: 38935808 PMCID: PMC11236161 DOI: 10.1371/journal.ppat.1012355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 07/10/2024] [Accepted: 06/19/2024] [Indexed: 06/29/2024] Open
Abstract
Stress granules (SGs), formed by untranslated messenger ribonucleoproteins (mRNPs) during cellular stress in eukaryotes, have been linked to flavivirus interference without clear understanding. This study reveals the role of Zika virus (ZIKV) NS2B as a scaffold protein mediating interaction between protein phosphatase 1α (PP1α) and eukaryotic initiation factor 2α (eIF2α). This interaction promotes eIF2α dephosphorylation by PP1α, inhibiting SG formation. The NS2B-PP1α complex exhibits remarkable stability, resisting ubiquitin-induced degradation and amplifying eIF2α dephosphorylation, thus promoting ZIKV replication. In contrast, the NS2BV35A mutant, interacting exclusively with eIF2α, fails to inhibit SG formation, resulting in reduced viral replication and diminished impact on brain organoid growth. These findings reveal PP1α's dual role in ZIKV infection, inducing interferon production as an antiviral factor and suppressing SG formation as a viral promoter. Moreover, we found that NS2B also serves as a versatile mechanism employed by flaviviruses to counter host antiviral defenses, primarily by broadly inhibiting SG formation. This research advances our comprehension of the complex interplay in flavivirus-host interactions, offering potential for innovative therapeutic strategies against flavivirus infections.
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Affiliation(s)
- Xiaoyan Wu
- State Key Laboratory of Virology and Modern Virology Research Center, College of Life Sciences, Wuhan University, Wuhan, China
| | - Linliang Zhang
- College of Life Sciences, Hubei University, Wuhan, China
| | - Cong Liu
- State Key Laboratory of Virology and Modern Virology Research Center, College of Life Sciences, Wuhan University, Wuhan, China
| | - Qi Cheng
- Wuhan Jinyintan Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Wen Zhao
- Tissue Engineering and Organ Manufacturing (TEOM) lab, Department of Biomedical Engineering, Wuhan University Taikang Medical School (School of Basic Medical Sciences), Wuhan, China
| | - Pu Chen
- Tissue Engineering and Organ Manufacturing (TEOM) lab, Department of Biomedical Engineering, Wuhan University Taikang Medical School (School of Basic Medical Sciences), Wuhan, China
- Taikang Center for Life and Medical Sciences, Wuhan University, Wuhan, China
| | - Yali Qin
- State Key Laboratory of Virology and Modern Virology Research Center, College of Life Sciences, Wuhan University, Wuhan, China
- College of Life Sciences, Hubei University, Wuhan, China
| | - Mingzhou Chen
- State Key Laboratory of Virology and Modern Virology Research Center, College of Life Sciences, Wuhan University, Wuhan, China
- College of Life Sciences, Hubei University, Wuhan, China
- Taikang Center for Life and Medical Sciences, Wuhan University, Wuhan, China
- Hubei Jiangxia Laboratory, Wuhan, China
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2
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Mungall BA. In Vitro Antiviral Screening for Henipaviruses at BSL4. Methods Mol Biol 2023; 2682:93-102. [PMID: 37610576 DOI: 10.1007/978-1-0716-3283-3_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
In vitro screening for antivirals is an essential step in the development of effective treatments against new and emerging pathogens. Here, we describe a simple, cell-based screening assay for evaluating antiviral effectiveness against Hendra and Nipah live virus infection under BSL4 conditions.
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Affiliation(s)
- Bruce A Mungall
- Australian Animal Health Laboratory, CSIRO Livestock Industries, Geelong, VIC, Australia
- GlaxoSmithKline Vaccines, Seoul, South Korea
- Vaccines and Immune Therapies, Astra Zeneca, Singapore, Singapore
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3
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Pesce G, Gondelaud F, Ptchelkine D, Nilsson JF, Bignon C, Cartalas J, Fourquet P, Longhi S. Experimental Evidence of Intrinsic Disorder and Amyloid Formation by the Henipavirus W Proteins. Int J Mol Sci 2022; 23:ijms23020923. [PMID: 35055108 PMCID: PMC8780864 DOI: 10.3390/ijms23020923] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/10/2022] [Accepted: 01/12/2022] [Indexed: 02/01/2023] Open
Abstract
Henipaviruses are severe human pathogens within the Paramyxoviridae family. Beyond the P protein, the Henipavirus P gene also encodes the V and W proteins which share with P their N-terminal, intrinsically disordered domain (NTD) and possess a unique C-terminal domain. Henipavirus W proteins antagonize interferon (IFN) signaling through NTD-mediated binding to STAT1 and STAT4, and prevent type I IFN expression and production of chemokines. Structural and molecular information on Henipavirus W proteins is lacking. By combining various bioinformatic approaches, we herein show that the Henipaviruses W proteins are predicted to be prevalently disordered and yet to contain short order-prone segments. Using limited proteolysis, differential scanning fluorimetry, analytical size exclusion chromatography, far-UV circular dichroism and small-angle X-ray scattering, we experimentally confirmed their overall disordered nature. In addition, using Congo red and Thioflavin T binding assays and negative-staining transmission electron microscopy, we show that the W proteins phase separate to form amyloid-like fibrils. The present study provides an additional example, among the few reported so far, of a viral protein forming amyloid-like fibrils, therefore significantly contributing to enlarge our currently limited knowledge of viral amyloids. In light of the critical role of the Henipavirus W proteins in evading the host innate immune response and of the functional role of phase separation in biology, these studies provide a conceptual asset to further investigate the functional impact of the phase separation abilities of the W proteins.
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Affiliation(s)
- Giulia Pesce
- Laboratoire Architecture et Fonction des Macromolécules Biologiques (AFMB), UMR 7257, Aix Marseille University and Centre National de la Recherche Scientifique (CNRS), 163 Avenue de Luminy, Case 932, 13288 Marseille, France; (G.P.); (F.G.); (D.P.); (J.F.N.); (C.B.); (J.C.)
| | - Frank Gondelaud
- Laboratoire Architecture et Fonction des Macromolécules Biologiques (AFMB), UMR 7257, Aix Marseille University and Centre National de la Recherche Scientifique (CNRS), 163 Avenue de Luminy, Case 932, 13288 Marseille, France; (G.P.); (F.G.); (D.P.); (J.F.N.); (C.B.); (J.C.)
| | - Denis Ptchelkine
- Laboratoire Architecture et Fonction des Macromolécules Biologiques (AFMB), UMR 7257, Aix Marseille University and Centre National de la Recherche Scientifique (CNRS), 163 Avenue de Luminy, Case 932, 13288 Marseille, France; (G.P.); (F.G.); (D.P.); (J.F.N.); (C.B.); (J.C.)
| | - Juliet F. Nilsson
- Laboratoire Architecture et Fonction des Macromolécules Biologiques (AFMB), UMR 7257, Aix Marseille University and Centre National de la Recherche Scientifique (CNRS), 163 Avenue de Luminy, Case 932, 13288 Marseille, France; (G.P.); (F.G.); (D.P.); (J.F.N.); (C.B.); (J.C.)
| | - Christophe Bignon
- Laboratoire Architecture et Fonction des Macromolécules Biologiques (AFMB), UMR 7257, Aix Marseille University and Centre National de la Recherche Scientifique (CNRS), 163 Avenue de Luminy, Case 932, 13288 Marseille, France; (G.P.); (F.G.); (D.P.); (J.F.N.); (C.B.); (J.C.)
| | - Jérémy Cartalas
- Laboratoire Architecture et Fonction des Macromolécules Biologiques (AFMB), UMR 7257, Aix Marseille University and Centre National de la Recherche Scientifique (CNRS), 163 Avenue de Luminy, Case 932, 13288 Marseille, France; (G.P.); (F.G.); (D.P.); (J.F.N.); (C.B.); (J.C.)
| | - Patrick Fourquet
- INSERM, Centre de Recherche en Cancérologie de Marseille (CRCM), Centre National de la Recherche Scientifique (CNRS), Marseille Protéomique, Institut Paoli-Calmettes, Aix Marseille University, 27 Bvd Leï Roure, CS 30059, 13273 Marseille, France;
| | - Sonia Longhi
- Laboratoire Architecture et Fonction des Macromolécules Biologiques (AFMB), UMR 7257, Aix Marseille University and Centre National de la Recherche Scientifique (CNRS), 163 Avenue de Luminy, Case 932, 13288 Marseille, France; (G.P.); (F.G.); (D.P.); (J.F.N.); (C.B.); (J.C.)
- Correspondence:
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4
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Jensen MR, Yabukarski F, Communie G, Condamine E, Mas C, Volchkova V, Tarbouriech N, Bourhis JM, Volchkov V, Blackledge M, Jamin M. Structural Description of the Nipah Virus Phosphoprotein and Its Interaction with STAT1. Biophys J 2020; 118:2470-2488. [PMID: 32348724 PMCID: PMC7231922 DOI: 10.1016/j.bpj.2020.04.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 03/31/2020] [Accepted: 04/06/2020] [Indexed: 12/25/2022] Open
Abstract
The structural characterization of modular proteins containing long intrinsically disordered regions intercalated with folded domains is complicated by their conformational diversity and flexibility and requires the integration of multiple experimental approaches. Nipah virus (NiV) phosphoprotein, an essential component of the viral RNA transcription/replication machine and a component of the viral arsenal that hijacks cellular components and counteracts host immune responses, is a prototypical model for such modular proteins. Curiously, the phosphoprotein of NiV is significantly longer than the corresponding protein of other paramyxoviruses. Here, we combine multiple biophysical methods, including x-ray crystallography, NMR spectroscopy, and small angle x-ray scattering, to characterize the structure of this protein and provide an atomistic representation of the full-length protein in the form of a conformational ensemble. We show that full-length NiV phosphoprotein is tetrameric, and we solve the crystal structure of its tetramerization domain. Using NMR spectroscopy and small angle x-ray scattering, we show that the long N-terminal intrinsically disordered region and the linker connecting the tetramerization domain to the C-terminal X domain exchange between multiple conformations while containing short regions of residual secondary structure. Some of these transient helices are known to interact with partners, whereas others represent putative binding sites for yet unidentified proteins. Finally, using NMR spectroscopy and isothermal titration calorimetry, we map a region of the phosphoprotein, comprising residues between 110 and 140 and common to the V and W proteins, that binds with weak affinity to STAT1 and confirm the involvement of key amino acids of the viral protein in this interaction. This provides new, to our knowledge, insights into how the phosphoprotein and the nonstructural V and W proteins of NiV perform their multiple functions.
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Affiliation(s)
| | - Filip Yabukarski
- Institut de Biologie Structurale, University Grenoble Alpes, CEA, CNRS, Grenoble, France
| | - Guillaume Communie
- Institut de Biologie Structurale, University Grenoble Alpes, CEA, CNRS, Grenoble, France
| | - Eric Condamine
- Institut de Biologie Structurale, University Grenoble Alpes, CEA, CNRS, Grenoble, France
| | - Caroline Mas
- Integrated Structural Biology Grenoble CNRS, CEA, University Grenoble Alpes, EMBL, Grenoble, France
| | - Valentina Volchkova
- Molecular Basis of Viral Pathogenicity, Centre International de Recherche en Infectiologie, INSERMU1111-CNRS UMR5308, Université Claude Bernard Lyon 1, ENS de Lyon, Lyon, France
| | - Nicolas Tarbouriech
- Institut de Biologie Structurale, University Grenoble Alpes, CEA, CNRS, Grenoble, France
| | - Jean-Marie Bourhis
- Institut de Biologie Structurale, University Grenoble Alpes, CEA, CNRS, Grenoble, France
| | - Viktor Volchkov
- Molecular Basis of Viral Pathogenicity, Centre International de Recherche en Infectiologie, INSERMU1111-CNRS UMR5308, Université Claude Bernard Lyon 1, ENS de Lyon, Lyon, France
| | - Martin Blackledge
- Institut de Biologie Structurale, University Grenoble Alpes, CEA, CNRS, Grenoble, France
| | - Marc Jamin
- Institut de Biologie Structurale, University Grenoble Alpes, CEA, CNRS, Grenoble, France.
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5
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Chatterjee S, Basler CF, Amarasinghe GK, Leung DW. Molecular Mechanisms of Innate Immune Inhibition by Non-Segmented Negative-Sense RNA Viruses. J Mol Biol 2016; 428:3467-82. [PMID: 27487481 DOI: 10.1016/j.jmb.2016.07.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/25/2016] [Accepted: 07/25/2016] [Indexed: 12/25/2022]
Abstract
The host innate immune system serves as the first line of defense against viral infections. Germline-encoded pattern recognition receptors detect molecular patterns associated with pathogens and activate innate immune responses. Of particular relevance to viral infections are those pattern recognition receptors that activate type I interferon responses, which establish an antiviral state. The order Mononegavirales is composed of viruses that possess single-stranded, non-segmented negative-sense (NNS) RNA genomes and are important human pathogens that consistently antagonize signaling related to type I interferon responses. NNS viruses have limited encoding capacity compared to many DNA viruses, and as a likely consequence, most open reading frames encode multifunctional viral proteins that interact with host factors in order to evade host cell defenses while promoting viral replication. In this review, we will discuss the molecular mechanisms of innate immune evasion by select NNS viruses. A greater understanding of these interactions will be critical in facilitating the development of effective therapeutics and viral countermeasures.
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Affiliation(s)
- Srirupa Chatterjee
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Christopher F Basler
- Center of Microbial Pathogenesis, Georgia State University, Atlanta, GA 30303, USA.
| | - Gaya K Amarasinghe
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.
| | - Daisy W Leung
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.
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6
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Davis ME, Wang MK, Rennick LJ, Full F, Gableske S, Mesman AW, Gringhuis SI, Geijtenbeek TBH, Duprex WP, Gack MU. Antagonism of the phosphatase PP1 by the measles virus V protein is required for innate immune escape of MDA5. Cell Host Microbe 2015; 16:19-30. [PMID: 25011105 DOI: 10.1016/j.chom.2014.06.007] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 03/07/2014] [Accepted: 04/25/2014] [Indexed: 12/25/2022]
Abstract
The cytosolic sensor MDA5 is crucial for antiviral innate immune defense against various RNA viruses including measles virus; as such, many viruses have evolved strategies to antagonize the antiviral activity of MDA5. Here, we show that measles virus escapes MDA5 detection by targeting the phosphatases PP1α and PP1γ, which regulate MDA5 activity by removing an inhibitory phosphorylation mark. The V proteins of measles virus and the related paramyxovirus Nipah virus interact with PP1α/γ, preventing PP1-mediated dephosphorylation of MDA5 and thereby its activation. The PP1 interaction with the measles V protein is mediated by a conserved PP1-binding motif in the C-terminal region of the V protein. A recombinant measles virus expressing a mutant V protein deficient in PP1 binding is unable to antagonize MDA5 and is growth impaired due to its inability to suppress interferon induction. This identifies PP1 antagonism as a mechanism employed by paramyxoviruses for evading innate immune recognition.
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Affiliation(s)
- Meredith E Davis
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA; Microbiology Division, New England Primate Research Center, Harvard Medical School, Southborough, MA 01772, USA
| | - May K Wang
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA; Microbiology Division, New England Primate Research Center, Harvard Medical School, Southborough, MA 01772, USA
| | - Linda J Rennick
- Department of Microbiology, Boston University School of Medicine, Boston, MA 02118, USA
| | - Florian Full
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Sebastian Gableske
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Annelies W Mesman
- Department of Experimental Immunology, Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, the Netherlands
| | - Sonja I Gringhuis
- Department of Experimental Immunology, Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, the Netherlands
| | - Teunis B H Geijtenbeek
- Department of Experimental Immunology, Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, the Netherlands
| | - W Paul Duprex
- Department of Microbiology, Boston University School of Medicine, Boston, MA 02118, USA
| | - Michaela U Gack
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA; Microbiology Division, New England Primate Research Center, Harvard Medical School, Southborough, MA 01772, USA.
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7
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Brudner M, Karpel M, Lear C, Chen L, Yantosca LM, Scully C, Sarraju A, Sokolovska A, Zariffard MR, Eisen DP, Mungall BA, Kotton DN, Omari A, Huang IC, Farzan M, Takahashi K, Stuart L, Stahl GL, Ezekowitz AB, Spear GT, Olinger GG, Schmidt EV, Michelow IC. Lectin-dependent enhancement of Ebola virus infection via soluble and transmembrane C-type lectin receptors. PLoS One 2013; 8:e60838. [PMID: 23573288 PMCID: PMC3614905 DOI: 10.1371/journal.pone.0060838] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Accepted: 03/05/2013] [Indexed: 01/19/2023] Open
Abstract
Mannose-binding lectin (MBL) is a key soluble effector of the innate immune system that recognizes pathogen-specific surface glycans. Surprisingly, low-producing MBL genetic variants that may predispose children and immunocompromised individuals to infectious diseases are more common than would be expected in human populations. Since certain immune defense molecules, such as immunoglobulins, can be exploited by invasive pathogens, we hypothesized that MBL might also enhance infections in some circumstances. Consequently, the low and intermediate MBL levels commonly found in human populations might be the result of balancing selection. Using model infection systems with pseudotyped and authentic glycosylated viruses, we demonstrated that MBL indeed enhances infection of Ebola, Hendra, Nipah and West Nile viruses in low complement conditions. Mechanistic studies with Ebola virus (EBOV) glycoprotein pseudotyped lentiviruses confirmed that MBL binds to N-linked glycan epitopes on viral surfaces in a specific manner via the MBL carbohydrate recognition domain, which is necessary for enhanced infection. MBL mediates lipid-raft-dependent macropinocytosis of EBOV via a pathway that appears to require less actin or early endosomal processing compared with the filovirus canonical endocytic pathway. Using a validated RNA interference screen, we identified C1QBP (gC1qR) as a candidate surface receptor that mediates MBL-dependent enhancement of EBOV infection. We also identified dectin-2 (CLEC6A) as a potentially novel candidate attachment factor for EBOV. Our findings support the concept of an innate immune haplotype that represents critical interactions between MBL and complement component C4 genes and that may modify susceptibility or resistance to certain glycosylated pathogens. Therefore, higher levels of native or exogenous MBL could be deleterious in the setting of relative hypocomplementemia which can occur genetically or because of immunodepletion during active infections. Our findings confirm our hypothesis that the pressure of infectious diseases may have contributed in part to evolutionary selection of MBL mutant haplotypes.
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Affiliation(s)
- Matthew Brudner
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - Marshall Karpel
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - Calli Lear
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, United States of America
| | - Li Chen
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - L. Michael Yantosca
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - Corinne Scully
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, United States of America
| | - Ashish Sarraju
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - Anna Sokolovska
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - M. Reza Zariffard
- Department of Immunology and Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Damon P. Eisen
- Victorian Infectious Diseases Service, Royal Melbourne Hospital, Parkville, Victoria, Australia
| | - Bruce A. Mungall
- Australian Animal Health Laboratory, Commonwealth Scientific and Industrial Research Organisation (CSIRO) Livestock Industries, Geelong, Victoria, Australia
| | - Darrell N. Kotton
- Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, United States of America
| | - Amel Omari
- Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, United States of America
| | - I-Chueh Huang
- New England Primate Research Center, Southborough, Massachusetts, United States of America
| | - Michael Farzan
- New England Primate Research Center, Southborough, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
| | - Kazue Takahashi
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
| | - Lynda Stuart
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
| | - Gregory L. Stahl
- CETRI, Brigham and Women's Hospital, Boston, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
| | - Alan B. Ezekowitz
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - Gregory T. Spear
- Department of Immunology and Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Gene G. Olinger
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, United States of America
| | - Emmett V. Schmidt
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail: (EVS); (ICM)
| | - Ian C. Michelow
- Programs of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail: (EVS); (ICM)
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8
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Abstract
Nipah (NiV) and Hendra (HeV) viruses comprise the genus Henipavirus and are highly pathogenic paramyxoviruses, which cause fatal encephalitis and respiratory disease in humans. Since their respective initial outbreaks in 1998 and 1994, they have continued to cause sporadic outbreaks resulting in fatal disease. Due to their designation as Biosafety Level 4 pathogens, the level of containment required to work with live henipaviruses is available only to select laboratories around the world. This chapter provides an overview of the molecular virology of NiV and HeV including comparisons to other, well-characterized paramyxoviruses. This chapter also describes the sequence diversity present among the henipaviruses.
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Affiliation(s)
- Paul A Rota
- MS-C-22, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
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9
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Salvamani S, Tey BT, Ng WC, Tan WS. Production and purification of the phosphoprotein of Nipah virus in Escherichia coli for use in diagnostic assays. BIOTECHNOL BIOPROC E 2011. [DOI: 10.1007/s12257-011-0095-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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10
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Michelow IC, Dong M, Mungall BA, Yantosca LM, Lear C, Ji X, Karpel M, Rootes CL, Brudner M, Houen G, Eisen DP, Kinane TB, Takahashi K, Stahl GL, Olinger GG, Spear GT, Ezekowitz RAB, Schmidt EV. A novel L-ficolin/mannose-binding lectin chimeric molecule with enhanced activity against Ebola virus. J Biol Chem 2010; 285:24729-39. [PMID: 20516066 PMCID: PMC2915709 DOI: 10.1074/jbc.m110.106260] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2010] [Revised: 05/28/2010] [Indexed: 12/21/2022] Open
Abstract
Ebola viruses constitute a newly emerging public threat because they cause rapidly fatal hemorrhagic fevers for which no treatment exists, and they can be manipulated as bioweapons. We targeted conserved N-glycosylated carbohydrate ligands on viral envelope surfaces using novel immune therapies. Mannose-binding lectin (MBL) and L-ficolin (L-FCN) were selected because they function as opsonins and activate complement. Given that MBL has a complex quaternary structure unsuitable for large scale cost-effective production, we sought to develop a less complex chimeric fusion protein with similar ligand recognition and enhanced effector functions. We tested recombinant human MBL and three L-FCN/MBL variants that contained the MBL carbohydrate recognition domain and varying lengths of the L-FCN collagenous domain. Non-reduced chimeric proteins formed predominantly nona- and dodecameric oligomers, whereas recombinant human MBL formed octadecameric and larger oligomers. Surface plasmon resonance revealed that L-FCN/MBL76 had the highest binding affinities for N-acetylglucosamine-bovine serum albumin and mannan. The same chimeric protein displayed superior complement C4 cleavage and binding to calreticulin (cC1qR), a putative receptor for MBL. L-FCN/MBL76 reduced infection by wild type Ebola virus Zaire significantly greater than the other molecules. Tapping mode atomic force microscopy revealed that L-FCN/MBL76 was significantly less tall than the other molecules despite similar polypeptide lengths. We propose that alterations in the quaternary structure of L-FCN/MBL76 resulted in greater flexibility in the collagenous or neck region. Similarly, a more pliable molecule might enhance cooperativity between the carbohydrate recognition domains and their cognate ligands, complement activation, and calreticulin binding dynamics. L-FCN/MBL chimeric proteins should be considered as potential novel therapeutics.
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Affiliation(s)
- Ian C. Michelow
- From the Program of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114
| | - Mingdong Dong
- Interdisciplinary Nanoscience Center (iNANO), University of Aarhus, DK-8000 Aarhus, Denmark
| | - Bruce A. Mungall
- Australian Animal Health Laboratory, Commonwealth Scientific and Industrial Research Organisation (CSIRO) Livestock Industries, Geelong, Victoria 3220, Australia
| | - L. Michael Yantosca
- From the Program of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114
| | - Calli Lear
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland 21702
| | - Xin Ji
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois 60612
| | - Marshall Karpel
- From the Program of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114
| | - Christina L. Rootes
- Australian Animal Health Laboratory, Commonwealth Scientific and Industrial Research Organisation (CSIRO) Livestock Industries, Geelong, Victoria 3220, Australia
| | - Matthew Brudner
- From the Program of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114
| | - Gunnar Houen
- Department of Clinical Biochemistry and Immunology, Statens Serum Institut, DK-2300 Copenhagen, Denmark
| | - Damon P. Eisen
- Victorian Infectious Diseases Service, Royal Melbourne Hospital, Parkville 3050, Australia, and
| | - T. Bernard Kinane
- From the Program of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114
| | - Kazue Takahashi
- From the Program of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114
| | - Gregory L. Stahl
- Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115
| | - Gene G. Olinger
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland 21702
| | - Gregory T. Spear
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois 60612
| | - R. Alan B. Ezekowitz
- From the Program of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114
| | - Emmett V. Schmidt
- From the Program of Developmental Immunology, Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114
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11
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Chiang CF, Lo MK, Rota PA, Spiropoulou CF, Rollin PE. Use of monoclonal antibodies against Hendra and Nipah viruses in an antigen capture ELISA. Virol J 2010; 7:115. [PMID: 20525276 PMCID: PMC2896928 DOI: 10.1186/1743-422x-7-115] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Accepted: 06/03/2010] [Indexed: 12/21/2022] Open
Abstract
Background Outbreaks of Hendra (HeV) and Nipah (NiV) viruses have been reported starting in 1994 and 1998, respectively. Both viruses are capable of causing fatal disease in humans and effecting great economical loss in the livestock industry. Results Through screening of hybridomas derived from mice immunized with γ-irradiated Nipah virus, we identified two secreted antibodies; one reactive with the nucleocapsid (N) protein and the other, the phosphoprotein (P) of henipaviruses. Epitope mapping and protein sequence alignments between NiV and HeV suggest the last 14 amino acids of the carboxyl terminus of the N protein is the target of the anti-N antibody. The anti-P antibody recognizes an epitope in the amino-terminal half of P protein. These monoclonal antibodies were used to develop two antigen capture ELISAs, one for virus detection and the other for differentiation between NiV and HeV. The lower limit of detection of the capture assay with both monoclonal antibodies was 400 pfu. The anti-N antibody was used to successfully detect NiV in a lung tissue suspension from an infected pig. Conclusion The antigen capture ELISA developed is potentially affordable tool to provide rapid detection and differentiation between the henipaviruses.
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Affiliation(s)
- Cheng-Feng Chiang
- Special Pathogens Branch, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
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12
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Abstract
The fusion of enveloped viruses with the host cell is driven by specialized fusion proteins to initiate infection. The "class I" fusion proteins harbor two regions, typically two heptad repeat (HR) domains, which are central to the complex conformational changes leading to fusion: the first heptad repeat (HRN) is adjacent to the fusion peptide, while the second (HRC) immediately precedes the transmembrane domain. Peptides derived from the HR regions can inhibit fusion, and one HR peptide, T20 (enfuvirtide), is in clinical use for HIV-1. For paramyxoviruses, the activities of two membrane proteins, the receptor-binding protein (hemagglutinin-neuraminidase [HN] or G) and the fusion protein (F), initiate viral entry. The binding of HN or G to its receptor on a target cell triggers the activation of F, which then inserts into the target cell and mediates the membrane fusion that initiates infection. We have shown that for paramyxoviruses, the inhibitory efficacy of HR peptides is inversely proportional to the rate of F activation. For HIV-1, the antiviral potency of an HRC-derived peptide can be dramatically increased by targeting it to the membrane microdomains where fusion occurs, via the addition of a cholesterol group. We report here that for three paramyxoviruses-human parainfluenza virus type 3 (HPIV3), a major cause of lower respiratory tract diseases in infants, and the emerging zoonotic viruses Hendra virus (HeV) and Nipah virus (NiV), which cause lethal central nervous system diseases-the addition of cholesterol to a paramyxovirus HRC-derived peptide increased antiviral potency by 2 log units. Our data suggest that this enhanced activity is indeed the result of the targeting of the peptide to the plasma membrane, where fusion occurs. The cholesterol-tagged peptides on the cell surface create a protective antiviral shield, target the F protein directly at its site of action, and expand the potential utility of inhibitory peptides for paramyxoviruses.
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13
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Shaw ML. Henipaviruses employ a multifaceted approach to evade the antiviral interferon response. Viruses 2009; 1:1190-203. [PMID: 21994589 PMCID: PMC3185527 DOI: 10.3390/v1031190] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2009] [Revised: 12/02/2009] [Accepted: 12/03/2009] [Indexed: 12/13/2022] Open
Abstract
Hendra and Nipah virus, which constitute the genus Henipavirus, are zoonotic paramyxoviruses that have been associated with sporadic outbreaks of severe disease and mortality in humans since their emergence in the late 1990s. Similar to other paramyxoviruses, their ability to evade the host interferon (IFN) response is conferred by the P gene. The henipavirus P gene encodes four proteins; the P, V, W and C proteins, which have all been described to inhibit the antiviral response. Further studies have revealed that these proteins have overlapping but unique properties which enable the virus to block multiple signaling pathways in the IFN response. The best characterized of these is the JAK-STAT signaling pathway which is targeted by the P, V and W proteins via an interaction with the transcription factor STAT1. In addition the V and W proteins can both limit virus-induced induction of IFN but they appear to do this via distinct mechanisms that rely on unique sequences in their C-terminal domains. The ability to generate recombinant Nipah viruses now gives us the opportunity to determine the precise role for each of these proteins and address their contribution to pathogenicity. Additionally, the question of whether these multiple anti-IFN strategies are all active in the different mammalian hosts for henipaviruses, particularly the fruit bat reservoir, warrants further exploration.
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Affiliation(s)
- Megan L Shaw
- Department of Microbiology, Mount Sinai School of Medicine, New York, NY 10029, USA; E-Mail: ; Tel.: +1-212-241-8931
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14
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Aljofan M, Sganga ML, Lo MK, Rootes CL, Porotto M, Meyer AG, Saubern S, Moscona A, Mungall BA. Antiviral activity of gliotoxin, gentian violet and brilliant green against Nipah and Hendra virus in vitro. Virol J 2009; 6:187. [PMID: 19889218 PMCID: PMC2781006 DOI: 10.1186/1743-422x-6-187] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2009] [Accepted: 11/04/2009] [Indexed: 12/14/2022] Open
Abstract
Background Using a recently described monolayer assay amenable to high throughput screening format for the identification of potential Nipah virus and Hendra virus antivirals, we have partially screened a low molecular weight compound library (>8,000 compounds) directly against live virus infection and identified twenty eight promising lead molecules. Initial single blind screens were conducted with 10 μM compound in triplicate with a minimum efficacy of 90% required for lead selection. Lead compounds were then further characterised to determine the median efficacy (IC50), cytotoxicity (CC50) and the in vitro therapeutic index in live virus and pseudotype assay formats. Results While a number of leads were identified, the current work describes three commercially available compounds: brilliant green, gentian violet and gliotoxin, identified as having potent antiviral activity against Nipah and Hendra virus. Similar efficacy was observed against pseudotyped Nipah and Hendra virus, vesicular stomatitis virus and human parainfluenza virus type 3 while only gliotoxin inhibited an influenza A virus suggesting a non-specific, broad spectrum activity for this compound. Conclusion All three of these compounds have been used previously for various aspects of anti-bacterial and anti-fungal therapy and the current results suggest that while unsuitable for internal administration, they may be amenable to topical antiviral applications, or as disinfectants and provide excellent positive controls for future studies.
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Affiliation(s)
- Mohamad Aljofan
- Australian Animal Health Laboratory, CSIRO Livestock Industries, Geelong, Australia.
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15
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Lo MK, Harcourt BH, Mungall BA, Tamin A, Peeples ME, Bellini WJ, Rota PA. Determination of the henipavirus phosphoprotein gene mRNA editing frequencies and detection of the C, V and W proteins of Nipah virus in virus-infected cells. J Gen Virol 2009; 90:398-404. [PMID: 19141449 DOI: 10.1099/vir.0.007294-0] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The henipaviruses, Nipah virus (NiV) and Hendra virus (HeV), are highly pathogenic zoonotic paramyxoviruses. Like many other paramyxoviruses, henipaviruses employ a process of co-transcriptional mRNA editing during transcription of the phosphoprotein (P) gene to generate additional mRNAs encoding the V and W proteins. The C protein is translated from the P mRNA, but in an alternate reading frame. Sequence analysis of multiple, cloned mRNAs showed that the mRNA editing frequencies of the P genes of the henipaviruses are higher than those reported for other paramyxoviruses. Antisera to synthetic peptides from the P, V, W and C proteins of NiV were generated to study their expression in infected cells. All proteins were detected in both infected cells and purified virions. In infected cells, the W protein was detected in the nucleus while P, V and C were found in the cytoplasm.
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Affiliation(s)
- Michael K Lo
- The Research Institute at Nationwide Children's Hospital, Center for Vaccines and Immunity, 700 Children's Drive, Columbus, OH 43205, USA.,The Ohio State University, College of Medicine, Department of Pediatrics, Columbus, OH 43205, USA.,Emory University School of Medicine, Department of Microbiology and Immunology, 1510 Clifton Road, Atlanta, GA 30322, USA.,Measles, Mumps, Rubella and Herpesviruses Laboratory Branch, 1600 Clifton Road, MS-C-22, Atlanta, GA 30333, USA
| | - Brian H Harcourt
- Measles, Mumps, Rubella and Herpesviruses Laboratory Branch, 1600 Clifton Road, MS-C-22, Atlanta, GA 30333, USA
| | - Bruce A Mungall
- Commonwealth Scientific Industrial Research Organization, Australian Animal Health Laboratory, 5 Portarlington Road, East Geelong, Victoria, Australia
| | - Azaibi Tamin
- Measles, Mumps, Rubella and Herpesviruses Laboratory Branch, 1600 Clifton Road, MS-C-22, Atlanta, GA 30333, USA
| | - Mark E Peeples
- The Ohio State University, College of Medicine, Department of Pediatrics, Columbus, OH 43205, USA.,The Research Institute at Nationwide Children's Hospital, Center for Vaccines and Immunity, 700 Children's Drive, Columbus, OH 43205, USA
| | - William J Bellini
- Measles, Mumps, Rubella and Herpesviruses Laboratory Branch, 1600 Clifton Road, MS-C-22, Atlanta, GA 30333, USA
| | - Paul A Rota
- Measles, Mumps, Rubella and Herpesviruses Laboratory Branch, 1600 Clifton Road, MS-C-22, Atlanta, GA 30333, USA
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16
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Abstract
Nipah virus (NiV) is predicted to encode four proteins from its P gene (P, V, W, and C) via mRNA editing and an alternate open reading frame. By use of specific antibodies, the expression of the V, W, and C proteins in NiV-infected cells has now been confirmed. Analysis of the P-gene transcripts shows a ratio of P:V:W mRNA of 1:1:1, but this differs over time, with greater proportions of V and W transcripts observed as the infection progresses. Eighty-two percent of transcripts are edited, with up to 11 G insertions observed. This exceptionally high editing frequency ensures expression of the V and W proteins.
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17
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Aljofan M, Saubern S, Meyer AG, Marsh G, Meers J, Mungall BA. Characteristics of Nipah virus and Hendra virus replication in different cell lines and their suitability for antiviral screening. Virus Res 2009; 142:92-9. [PMID: 19428741 DOI: 10.1016/j.virusres.2009.01.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2008] [Revised: 01/12/2009] [Accepted: 01/20/2009] [Indexed: 11/28/2022]
Abstract
We have recently described the development and validation of a high throughput screening assay suitable for henipavirus antiviral identification. While we are confident this assay is robust and effective, we wished to investigate assay performance in a range of alternative cell lines to determine if assay sensitivity and specificity could be improved. We evaluated ten different cell lines for their susceptibility to Hendra and Nipah virus infection and their sensitivity of detection of the effects of the broad spectrum antiviral, ribavirin and nine novel antivirals identified using our initial screening approach. Cell lines were grouped into three categories with respect to viral replication. Virus replicated best in Vero and BSR cells, followed by Hep-2, HeLa, BHK-21 and M17 cells. The lowest levels of RNA replication and viral protein expression were observed in BAEC, MMEC, A549 and ECV304 cells. Eight cell lines appeared to be similarly effective at discriminating the antiviral effects of ribavirin (<2.7-fold difference). The two cells lines most sensitive to the effect of ribavirin (ECV304 and BAEC) also displayed the lowest levels of viral replication while Vero cells were the least sensitive suggesting excess viral replication may limit drug efficacy and cell lines which limit viral replication may result in enhanced antiviral efficacy. However, there was no consistent trend observed with the other nine antivirals tested. While improvements in antiviral sensitivity in other cell lines may indicate an important role in future HTS assays, the slightly lower sensitivity to antiviral detection in Vero cells has inherent advantages in reducing the number of partially effective lead molecules identified during initial screens. Comparison of a panel of 54 novel antiviral compounds identified during routine screening of an in-house compound library in Vero, BHK-21 and BSR cells suggests no clear advantage of screening in either cell type.
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Affiliation(s)
- Mohamad Aljofan
- Australian Animal Health Laboratory, CSIRO Livestock Industries, Geelong, Australia
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18
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Inhibition of Henipavirus infection by RNA interference. Antiviral Res 2008; 80:324-31. [PMID: 18687361 PMCID: PMC7125758 DOI: 10.1016/j.antiviral.2008.07.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2008] [Revised: 07/08/2008] [Accepted: 07/09/2008] [Indexed: 01/21/2023]
Abstract
Nipah virus (NiV) and Hendra virus (HeV) are recently emerged zoonotic paramyxoviruses exclusively grouped within a new genus, Henipavirus. These viruses cause fatal disease in a wide range of species, including humans. Both NiV and HeV have continued to re-emerge sporadically in Bangladesh and Australia, respectively. There are currently no therapeutics or vaccines available to treat Henipavirus infection and both are classified as BSL4 pathogens. RNA interference (RNAi) is a process by which double-stranded RNA directs sequence-specific degradation of messenger RNA in animal and plant cells. Small interfering RNAs (siRNAs) mediate RNAi by inhibiting gene expression of homologous mRNA and our preliminary studies suggest RNAi may be a useful approach to developing novel therapies for these highly lethal pathogens. Eight NiV siRNA molecules (four L and four N gene specific), two HeV N gene specific, and two non-specific control siRNA molecules were designed and tested for their ability to inhibit a henipavirus minigenome replication system (which does not require the use of live virus) in addition to live virus infections in vitro. In the minigenome assay three out of the four siRNAs that targeted the L gene of NiV effectively inhibited replication. In contrast, only NiV N gene siRNAs were effective in reducing live NiV replication, suggesting inhibition of early, abundantly expressed gene transcripts may be more effective than later, less abundant transcripts. Additionally, some of the siRNAs effective against NiV infection were only partially effective inhibitors of HeV infection. An inverse correlation between the number of nucleotide mismatches and the efficacy of siRNA inhibition was observed. The demonstration that RNAi effectively inhibits henipavirus replication in vitro, is a novel approach and may provide an effective therapy for these highly lethal, zoonotic pathogens.
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19
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Ludlow LE, Lo MK, Rodriguez JJ, Rota PA, Horvath CM. Henipavirus V protein association with Polo-like kinase reveals functional overlap with STAT1 binding and interferon evasion. J Virol 2008; 82:6259-71. [PMID: 18417573 PMCID: PMC2447080 DOI: 10.1128/jvi.00409-08] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2008] [Accepted: 04/07/2008] [Indexed: 12/23/2022] Open
Abstract
Emerging viruses in the paramyxovirus genus Henipavirus evade host antiviral responses via protein interactions between the viral V and W proteins and cellular STAT1 and STAT2 and the cytosolic RNA sensor MDA5. Polo-like kinase (PLK1) is identified as being an additional cellular partner that can bind to Nipah virus P, V, and W proteins. For both Nipah virus and Hendra virus, contact between the V protein and the PLK1 polo box domain is required for V protein phosphorylation. Results indicate that PLK1 is engaged by Nipah virus V protein amino acids 100 to 160, previously identified as being the STAT1 binding domain responsible for host interferon (IFN) signaling evasion, via a Thr-Ser-Ser-Pro motif surrounding residue 130. A distinct Ser-Thr-Pro motif surrounding residue 199 mediates the PLK1 interaction with Hendra virus V protein. Select mutations in the motif surrounding residue 130 also influenced STAT1 binding and innate immune interference, and data indicate that the V:PLK1 and V:STAT complexes are V mediated yet independent of one another. The effects of STAT1/PLK1 binding motif mutations on the function the Nipah virus P protein in directing RNA synthesis were tested. Remarkably, mutations that selectively disrupt the STAT or PLK1 interaction site have no effects on Nipah virus P protein-mediated viral RNA synthesis. Therefore, mutations targeting V protein-mediated IFN evasion will not alter the RNA synthetic capacity of the virus, supporting an attenuation strategy based on disrupting host protein interactions.
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Affiliation(s)
- Louise E Ludlow
- Department of Medicine, Northwestern University, Evanston, Illinois 60208-3500, USA
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20
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Aljofan M, Porotto M, Moscona A, Mungall BA. Development and validation of a chemiluminescent immunodetection assay amenable to high throughput screening of antiviral drugs for Nipah and Hendra virus. J Virol Methods 2008; 149:12-9. [PMID: 18313148 DOI: 10.1016/j.jviromet.2008.01.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2007] [Revised: 01/11/2008] [Accepted: 01/17/2008] [Indexed: 11/27/2022]
Abstract
There are currently no antiviral drugs approved for the highly lethal Biosafety Level 4 pathogens Nipah and Hendra virus. A number of researchers are developing surrogate assays amenable to Biosafety Level 2 biocontainment but ultimately, the development of a high throughput screening method for directly quantifying these viruses in a Biosafety Level 4 environment will be critical for final evaluation of antiviral drugs identified in surrogate assays, in addition to reducing the time required for effective antiviral drug development. By adapting an existing immunoplaque assay and using enzyme linked immunodetection in a microtitre plate format, the current experiments describe a simple two step assay protocol involving an overnight virus inoculation of Vero cell monolayers (with or without antiviral drug treatment) at Biosafety Level 4, followed by cell fixation and virus inactivation enabling removal of plates from the Biosafety Level 4 laboratory and a subsequent immunodetection assay using a chemiluminescent horse radish peroxidase substrate to be performed at Biosafety Level 2. The analytical sensitivity (limit of detection) of this assay is 100 tissue culture infectious dose50/ml of either Nipah or Hendra virus. In addition this assay enables linear quantitation of virus over three orders of magnitude and is unaffected by dimethyl sulfoxide concentrations of 1% or less. Intra-assay coefficients of variation are acceptable (less than 20%) when detecting a minimum of 1000 tissue culture infectious dose50/ml of either virus although inter-assay variation is considerably greater. By an assessment of efficacies of the broad spectrum antiviral Ribavirin and an experimental fusion inhibitory peptide, this assay reveals a good correlation with previously published fluorescent immunodetection assays. The current experiments describe for the first time, a high throughput screening method amenable for direct assessment of live henipavirus antiviral drug activity.
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Affiliation(s)
- Mohamad Aljofan
- Australian Animal Health Laboratory, CSIRO Livestock Industries, Private Bag 24, Geelong 3220, Australia
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21
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Fogarty R, Halpin K, Hyatt AD, Daszak P, Mungall BA. Henipavirus susceptibility to environmental variables. Virus Res 2007; 132:140-4. [PMID: 18166242 DOI: 10.1016/j.virusres.2007.11.010] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2007] [Revised: 11/15/2007] [Accepted: 11/16/2007] [Indexed: 11/29/2022]
Abstract
The routes of henipavirus transmission between hosts are poorly understood. The purpose of this study was to measure the persistence of henipaviruses under various environmental conditions and thereby gain an insight into likely mechanisms of transmission. Henipaviruses survived for more than 4 days at 22 degrees C in pH-neutral fruit bat urine but were sensitive to higher temperatures and pH changes. On mango flesh, survival time varied depending on temperature and fruit pH, ranging from 2h to more than 2 days. Desiccation of viruses substantially reduced survival time to less than 2h. The sensitivity of henipaviruses to pH, temperature and desiccation indicates a need for close contact between hosts for transmission to occur, although under ideal conditions henipaviruses can persist for extended periods facilitating vehicle-borne transmission.
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Affiliation(s)
- Rhys Fogarty
- Department of Ophthalmology, Flinders Medical Centre, Adelaide, Australia
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22
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Patch JR, Crameri G, Wang LF, Eaton BT, Broder CC. Quantitative analysis of Nipah virus proteins released as virus-like particles reveals central role for the matrix protein. Virol J 2007; 4:1. [PMID: 17204159 PMCID: PMC1781425 DOI: 10.1186/1743-422x-4-1] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2006] [Accepted: 01/04/2007] [Indexed: 11/25/2022] Open
Abstract
Background Nipah virus (NiV) is an emerging paramyxovirus distinguished by its ability to cause fatal disease in both animal and human hosts. Together with Hendra virus (HeV), they comprise the genus Henipavirus in the Paramyxoviridae family. NiV and HeV are also restricted to Biosafety Level-4 containment and this has hampered progress towards examining details of their replication and morphogenesis. Here, we have established recombinant expression systems to study NiV particle assembly and budding through the formation of virus-like particles (VLPs). Results When expressed by recombinant Modified Vaccinia virus Ankara (rMVA) or plasmid transfection, individual NiV matrix (M), fusion (F) and attachment (G) proteins were all released into culture supernatants in a membrane-associated state as determined by sucrose density gradient flotation and immunoprecipitation. However, co-expression of F and G along with M revealed a shift in their distribution across the gradient, indicating association with M in VLPs. Protein release was also altered depending on the context of viral proteins being expressed, with F, G and nucleocapsid (N) protein reducing M release, and N release dependent on the co-expression of M. Immunoelectron microscopy and density analysis revealed VLPs that were similar to authentic virus. Differences in the budding dynamics of NiV proteins were also noted between rMVA and plasmid based strategies, suggesting that over-expression by poxvirus may not be appropriate for studying the details of recombinant virus particle assembly and release. Conclusion Taken together, the results indicate that NiV M, F, and G each possess some ability to bud from expressing cells, and that co-expression of these viral proteins results in a more organized budding process with M playing a central role. These findings will aid our understanding of paramyxovirus particle assembly in general and could help facilitate the development of a novel vaccine approach for henipaviruses.
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Affiliation(s)
- Jared R Patch
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, Maryland 20814, USA
| | - Gary Crameri
- CSIRO Livestock Industries, Australian Animal Health Laboratory, Geelong, Victoria 3220, Australia
| | - Lin-Fa Wang
- CSIRO Livestock Industries, Australian Animal Health Laboratory, Geelong, Victoria 3220, Australia
| | - Bryan T Eaton
- CSIRO Livestock Industries, Australian Animal Health Laboratory, Geelong, Victoria 3220, Australia
| | - Christopher C Broder
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, Maryland 20814, USA
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23
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Pejcic B, De Marco R, Parkinson G. The role of biosensors in the detection of emerging infectious diseases. Analyst 2006; 131:1079-90. [PMID: 17003853 DOI: 10.1039/b603402k] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Global biosecurity threats such as the spread of emerging infectious diseases (i.e., avian influenza, SARS, Hendra, Nipah, etc.) and bioterrorism have generated significant interest in recent years. There is considerable effort directed towards understanding and negating the proliferation of infectious diseases. Biosensors are an attractive tool which have the potential to detect the outbreak of a virus and/or disease. Although there is a host of technologies available, either commercially or in the scientific literature, the development of biosensors for the detection of emerging infectious diseases (EIDs) is still in its infancy. There is no doubt that the glucose biosensor, the gene chip, the protein chip, etc. have all played and are still playing a significant role in monitoring various biomolecules. Can biosensors play an important role for the detection of emerging infectious diseases? What does the future hold and which biosensor technology platform is suitable for the real-time detection of infectious diseases? These and many other questions will be addressed in this review. The purpose of this review is to present an overview of biosensors particularly in relation to EIDs. It provides a synopsis of the various types of biosensor technologies that have been used to detect EIDs, and describes some of the technologies behind them in terms of transduction and bioreceptor principles.
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Affiliation(s)
- Bobby Pejcic
- Nanochemistry Research Institute, Department of Applied Chemistry, Curtin University of Technology, GPO Box U 1987, Perth, WA, 6845, Australia
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24
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Muthuchelvan D, Sanyal A, Sarkar J, Sreenivasa BP, Bandyopadhyay SK. Comparative nucleotide sequence analysis of the phosphoprotein gene of peste des petits ruminants vaccine virus of Indian origin. Res Vet Sci 2005; 81:158-64. [PMID: 16289265 DOI: 10.1016/j.rvsc.2005.09.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2005] [Revised: 08/09/2005] [Accepted: 09/07/2005] [Indexed: 11/30/2022]
Abstract
The nucleotide sequences of the phosphoprotein (P) gene of peste des petits ruminants (PPRV) vaccine virus (PPRV Sungri/96) belongs to Asian lineage have been determined and the deduced amino acid sequences were compared with another vaccine strain PPRV/Nigeria75/1 and with those of the other morbilliviruses. The 1652 nucleotides of the P gene encode a phosphoprotein of 509 amino acid residues (from nucleotide numbers 60 to 1587), which is 91% identical to that of PPRV/Nigeria75/1. The C protein consists of 177 amino acid residues and is 91% identical with that of PPRV/Nigeria75/1. The conserved mRNA editing site (5'TTAAAAGGGCACAG) was present at positions 742-756 in the P gene, which is conserved in all other morbilliviruses. The CTT trinucleotide sequence is present at the N/P and P/M intergenic region, which is totally conserved in morbilliviruses. This will be the third sequence for the P gene of PPRV since that of the vaccine strain and a wild-type Turkish isolate has been published already.
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Affiliation(s)
- D Muthuchelvan
- Central Institute of Fisheries Technology, Cochin 682 029, India
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25
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Chen H, Gill A, Dove BK, Emmett SR, Kemp CF, Ritchie MA, Dee M, Hiscox JA. Mass spectroscopic characterization of the coronavirus infectious bronchitis virus nucleoprotein and elucidation of the role of phosphorylation in RNA binding by using surface plasmon resonance. J Virol 2005; 79:1164-79. [PMID: 15613344 PMCID: PMC538594 DOI: 10.1128/jvi.79.2.1164-1179.2005] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2003] [Accepted: 07/05/2004] [Indexed: 12/15/2022] Open
Abstract
Phosphorylation of the coronavirus nucleoprotein (N protein) has been predicted to play a role in RNA binding. To investigate this hypothesis, we examined the kinetics of RNA binding between nonphosphorylated and phosphorylated infectious bronchitis virus N protein with nonviral and viral RNA by surface plasmon resonance (Biacore). Mass spectroscopic analysis of N protein identified phosphorylation sites that were proximal to RNA binding domains. Kinetic analysis, by surface plasmon resonance, indicated that nonphosphorylated N protein bound with the same affinity to viral RNA as phosphorylated N protein. However, phosphorylated N protein bound to viral RNA with a higher binding affinity than nonviral RNA, suggesting that phosphorylation of N protein determined the recognition of virus RNA. The data also indicated that a known N protein binding site (involved in transcriptional regulation) consisting of a conserved core sequence present near the 5' end of the genome (in the leader sequence) functioned by promoting high association rates of N protein binding. Further analysis of the leader sequence indicated that the core element was not the only binding site for N protein and that other regions functioned to promote high-affinity binding.
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Affiliation(s)
- Hongying Chen
- School of Animal and Microbial Sciences, University of Reading, Reading, United Kingdom
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Rodriguez JJ, Horvath CM. Host Evasion by Emerging Paramyxoviruses: Hendra Virus and Nipah Virus V Proteins Inhibit Interferon Signaling. Viral Immunol 2004; 17:210-9. [PMID: 15279700 DOI: 10.1089/0882824041310568] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Interferon (IFN) can activate Signal Transducer and Activator of Transcription (STAT) proteins to establish a cellular antiviral response and inhibit virus replication. Many viruses have evolved strategies to inhibit this antiviral mechanism, but paramyxoviruses are unique in their abilities to directly target the IFN-responsive STAT proteins. Hendra virus and Nipah virus (Henipaviruses) are recently emerged paramyxoviruses that are the causative agents of fatal disease outbreaks in Australia and peninsular Malaysia. Similar to other paramyxoviruses, Henipaviruses inhibit IFN signal transduction through a virus-encoded protein called V. Recent studies have shown that Henipavirus V proteins target STAT proteins by inducing the formation of cytoplasmically localized high molecular weight STAT-containing complexes. This sequestration of STAT1 and STAT2 prevents STAT activation and blocks antiviral IFN signaling. As the V proteins are important factors for host evasion, they represent logical targets for therapeutics directed against Henipavirus epidemics.
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Affiliation(s)
- Jason J Rodriguez
- Immunobiology Center, Mount Sinai School of Medicine, New York, New York 10029, USA.
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Halpin K, Bankamp B, Harcourt BH, Bellini WJ, Rota PA. Nipah virus conforms to the rule of six in a minigenome replication assay. J Gen Virol 2004; 85:701-707. [PMID: 14993656 DOI: 10.1099/vir.0.19685-0] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
To study the replication of Nipah virus (NiV), a minigenome replication assay that does not require the use of infectious virus was developed. The minigenome was constructed to encode a NiV vRNA analogue containing the gene for chloramphenicol acetyltransferase (CAT) under the control of putative NiV transcription motifs and flanked by the NiV genomic termini. CAT protein was detected only when plasmids encoding the NiV minigenome, nucleocapsid protein (N), phosphoprotein (P) and polymerase protein (L) were transfected into CV1 cells. To determine whether NiV conforms to the rule of six, a series of plasmids encoding minigenomes that differed in length by a single nucleotide was tested in the replication assay. CAT production was detected only with the minigenome whose length was an even multiple of six. The replication assay was also used to show that the N, P and L proteins of NiV recognize cis-acting sequences in the genomic termini of Hendra virus (HeV) but not measles virus. While these results suggest that NiV uses a replication strategy that is similar to those of other paramyxoviruses, they also support the inclusion of NiV and HeV in a separate genus within the subfamily Paramyxovirinae.
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Affiliation(s)
- Kim Halpin
- Measles Virus Section, National Center for Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, MS-C22, Atlanta, GA 30333, USA
| | - Bettina Bankamp
- Measles Virus Section, National Center for Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, MS-C22, Atlanta, GA 30333, USA
| | - Brian H Harcourt
- Measles Virus Section, National Center for Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, MS-C22, Atlanta, GA 30333, USA
| | - William J Bellini
- Measles Virus Section, National Center for Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, MS-C22, Atlanta, GA 30333, USA
| | - Paul A Rota
- Measles Virus Section, National Center for Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, MS-C22, Atlanta, GA 30333, USA
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