1
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Taya T, Kami D, Teruyama F, Matoba S, Gojo S. Peptide-encoding gene transfer to modulate intracellular protein-protein interactions. Mol Ther Methods Clin Dev 2024; 32:101226. [PMID: 38516692 PMCID: PMC10952081 DOI: 10.1016/j.omtm.2024.101226] [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: 09/25/2023] [Accepted: 02/24/2024] [Indexed: 03/23/2024]
Abstract
Peptide drug discovery has great potential, but the cell membrane is a major obstacle when the target is an intracellular protein-protein interaction (PPI). It is difficult to target PPIs with small molecules; indeed, there are no intervention tools that can target any intracellular PPI. In this study, we developed a platform that enables the introduction of peptides into cells via mRNA-based gene delivery. Peptide-length nucleic acids do not enable stable ribosome binding and exhibit little to no translation into protein. In this study, a construct was created in which the sequence encoding dihydrofolate reductase (DHFR) was placed in front of the sequence encoding the target peptide, together with a translation skipping sequence, as a sequence that meets the requirements of promoting ribosome binding and rapid decay of the translated protein. This enabled efficient translation from the mRNA encoding the target protein while preventing unnecessary protein residues. Using this construct, we showed that it can inhibit Drp1/Fis1 binding, one of the intracellular PPIs, which governs mitochondrial fission, an important aspect of mitochondrial dynamics. In addition, it was shown to inhibit pathological hyperfission, normalize mitochondrial dynamics and metabolism, and inhibit apoptosis of the mitochondrial pathway.
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Affiliation(s)
- Toshihiko Taya
- Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Daisuke Kami
- Department of Regenerative Medicine, Graduate School of Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Fumiya Teruyama
- Department of Regenerative Medicine, Graduate School of Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan
- Pharmacology Research Department, Tokyo New Drug Research Laboratories, Kowa Company, Ltd, Tokyo, Japan
| | - Satoaki Matoba
- Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Satoshi Gojo
- Department of Regenerative Medicine, Graduate School of Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan
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2
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An D, Li Z, Beavis AC, Briggs KR, Harvill M, He B. Cleavage of the syncytial protein of J paramyxovirus is required for its ability to promote cell-cell fusion. Proc Natl Acad Sci U S A 2024; 121:e2403389121. [PMID: 38833471 PMCID: PMC11181024 DOI: 10.1073/pnas.2403389121] [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: 02/17/2024] [Accepted: 05/02/2024] [Indexed: 06/06/2024] Open
Abstract
Cell-cell fusion mediated by most paramyxovirus requires fusion protein (F) and attachment protein (H, HN, or G). The F protein is proteolytic cleaved to be fusogenically active. J paramyxovirus (JPV) has a unique feature in the family Paramyxoviridae: It encodes an integral membrane protein, syncytial protein (SP, formerly known as transmembrane protein, TM), which is essential in JPV-promoted cell-cell fusion (i.e., syncytial). In this study, we report that cleavage of SP is essential for its syncytial-promoting activity. We have identified the cleavage site of SP at amino acid residues 172 to 175, LKTG, and deletion of the "LKTG" residues abolished SP protein cleavage and its ability to promote cell-cell fusion. Replacing the cleavage site LKTG with a factor Xa protease cleavage site allows cleavage of the SP with factor Xa protease and restores its ability to promote cell-cell fusion. Furthermore, results from a hemifusion assay indicate that cleavage of SP plays an important role in the progression from the intermediate hemifusion state to a complete fusion. This work indicates that SP has many characteristics of a fusion protein. We propose that SP is likely a cell-cell fusion-promoting protein.
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Affiliation(s)
- Dong An
- Department of Infectious Diseases, University of Georgia College of Veterinary Medicine, Athens, GA30602
| | - Zhuo Li
- Department of Infectious Diseases, University of Georgia College of Veterinary Medicine, Athens, GA30602
| | - Ashley C. Beavis
- Department of Infectious Diseases, University of Georgia College of Veterinary Medicine, Athens, GA30602
| | - Kelsey R. Briggs
- Department of Infectious Diseases, University of Georgia College of Veterinary Medicine, Athens, GA30602
| | - Mason Harvill
- Department of Infectious Diseases, University of Georgia College of Veterinary Medicine, Athens, GA30602
| | - Biao He
- Department of Infectious Diseases, University of Georgia College of Veterinary Medicine, Athens, GA30602
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3
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Haas G, Lee B. Reverse Genetics Systems for the De Novo Rescue of Diverse Members of Paramyxoviridae. Methods Mol Biol 2024; 2733:15-35. [PMID: 38064024 DOI: 10.1007/978-1-0716-3533-9_2] [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: 12/18/2023]
Abstract
Paramyxoviruses place significant burdens on both human and wildlife health; while some paramyxoviruses are established within human populations, others circulate within diverse animal reservoirs. Concerningly, bat-borne paramyxoviruses have spilled over into humans with increasing frequency in recent years, resulting in severe disease. The risk of future zoonotic outbreaks, as well as the persistence of paramyxoviruses that currently circulate within humans, highlights the need for efficient tools through which to interrogate paramyxovirus biology. Reverse genetics systems provide scientists with the ability to rescue paramyxoviruses de novo, offering versatile tools for implementation in both research and public health settings. Reverse genetics systems have greatly improved over the past 30 years, with several key innovations optimizing the success of paramyxovirus rescue. Here, we describe the significance of such advances and provide a generally applicable guide for the development and use of reverse genetics systems for the rescue of diverse members of Paramyxoviridae.
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Affiliation(s)
- Griffin Haas
- Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Benhur Lee
- Icahn School of Medicine at Mount Sinai, New York, NY, USA.
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4
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Hu Z, Feng J, Deng J, Zhang Y, He X, Hu J, Wang X, Hu S, Liu X, Liu X. Delivery of Fc-fusion Protein by a Recombinant Newcastle Disease Virus Vector. Appl Biochem Biotechnol 2023; 195:2077-2092. [PMID: 36417109 DOI: 10.1007/s12010-022-04237-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/08/2022] [Indexed: 11/24/2022]
Abstract
Fc-fusion proteins (FCPs), a new generation biological medicine, have revolutionized the practice of medicines that treat diseases. However, complex manufacturing techniques are required for FCP production, casting the affordability and accessibility issues in low- and middle-income economies (LMIEs). Virus-vectored system may serve as a simple and cost-effective platform for FCP delivery. As a proof-of-concept study, Newcastle disease virus (NDV), a widely-used vector for vaccine generation, was used as a vector to express and deliver a model FCP composed of the hemagglutinin (HA) and IgG Fc. A recombinant NDV expressing the HA-Fc fusion protein was generated using reverse genetics, which had comparable replication and virulence to the parental virus. High levels of expression of soluble HA-Fc were detected in cell culture and embryonated chicken eggs inoculated with the recombinant NDV. In addition, the recombinant NDV replicated in the lung of mouse, delivering the HA-Fc protein to this organ. The HA-Fc expressed by NDV specifically bound to murine FcγRI, which was dependent on the presence of the Fc tag. The recombinant NDV induced high vector-specific antibody response, whereas it failed to elicit H7N9-specific antibody immunity in mice. The absence of HA-specific antibodies may be attributed to deficient incorporation of the HA-Fc protein into NDV virion particles. Our results indicated that NDV may be potentially used as a vector for FCP expression and delivery. This strategy may help to enhance the affordability and equal accessibility of FCP biological medicines, especially in LIMEs.
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Affiliation(s)
- Zenglei Hu
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, China.,Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou University, Yangzhou, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China.,Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China
| | - Jianing Feng
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, China.,College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, China
| | - Jing Deng
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, China.,Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Yanyan Zhang
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, China.,Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Xiaozheng He
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, China.,Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Jiao Hu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou University, Yangzhou, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China.,Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China
| | - Xiaoquan Wang
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou University, Yangzhou, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China.,Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China
| | - Shunlin Hu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou University, Yangzhou, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China.,Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China
| | - Xiaowen Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou University, Yangzhou, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China.,Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China
| | - Xiufan Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou University, Yangzhou, China. .,Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China. .,Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China.
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5
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Wille M, Shi M, Hurt AC, Klaassen M, Holmes EC. RNA virome abundance and diversity is associated with host age in a bird species. Virology 2021; 561:98-106. [PMID: 34182259 DOI: 10.1016/j.virol.2021.06.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 06/16/2021] [Accepted: 06/16/2021] [Indexed: 12/19/2022]
Abstract
Despite the ongoing interest in virus discovery, little is known about the factors that shape communities of viruses within individual hosts. Here, we address how virus communities might be impacted by the age of the hosts they infect, using total RNA sequencing to reveal the RNA viromes of different age groups of Ruddy Turnstones (Arenaria interpres). From oropharyngeal and cloacal swabs we identified 14 viruses likely infecting birds, 11 of which were novel, including members of the Reoviridae, Astroviridae, and Picornaviridae. Strikingly, 12 viruses identified were from juvenile birds sampled in the first year of their life, compared to only two viruses in adult birds. Both viral abundance and alpha diversity were marginally higher in juvenile than adult birds. As well as informing studies of virus ecology, that host age might be associated with viral composition is an important consideration for the future surveillance of novel and emerging viruses.
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Affiliation(s)
- Michelle Wille
- Marie Bashir Institute for Infectious Diseases and Biosecurity, School of Life and Environmental Sciences and School of Medical Sciences, The University of Sydney, Sydney, 2006, New South Wales, Australia.
| | - Mang Shi
- Marie Bashir Institute for Infectious Diseases and Biosecurity, School of Life and Environmental Sciences and School of Medical Sciences, The University of Sydney, Sydney, 2006, New South Wales, Australia
| | - Aeron C Hurt
- Melbourne School of Population and Global Health, University of Melbourne, Melbourne, 3000, Australia
| | - Marcel Klaassen
- Centre for Integrative Ecology, Deakin University, Geelong, 3217, Victoria, Australia; Victorian Wader Study Group, Geelong, 3217, Victoria, Australia
| | - Edward C Holmes
- Marie Bashir Institute for Infectious Diseases and Biosecurity, School of Life and Environmental Sciences and School of Medical Sciences, The University of Sydney, Sydney, 2006, New South Wales, Australia.
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6
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Elbehairy MA, Khattar SK, Samal SK. Recovery of Recombinant Avian Paramyxovirus Type-3 Strain Wisconsin by Reverse Genetics and Its Evaluation as a Vaccine Vector for Chickens. Viruses 2021; 13:v13020316. [PMID: 33669530 PMCID: PMC7922763 DOI: 10.3390/v13020316] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 02/17/2021] [Accepted: 02/17/2021] [Indexed: 01/22/2023] Open
Abstract
A reverse genetic system for avian paramyxovirus type-3 (APMV-3) strain Wisconsin was created and the infectious virus was recovered from a plasmid-based viral antigenomic cDNA. Green fluorescent protein (GFP) gene was cloned into the recombinant APMV-3 genome as a foreign gene. Stable expression of GFP by the recovered virus was confirmed for at least 10 consecutive passages. APMV-3 strain Wisconsin was evaluated against APMV-3 strain Netherlands and APMV-1 strain LaSota as a vaccine vector. The three viral vectors expressing GFP as a foreign protein were compared for level of GFP expression level, growth rate in chicken embryo fibroblast (DF-1) cells, and tissue distribution and immunogenicity in specific pathogen-free (SPF) day-old chickens. APMV-3 strain Netherlands showed highest growth rate and GFP expression level among the three APMV vectors in vitro. APMV-3 strain Wisconsin and APMV-1 strain LaSota vectors were mainly confined to the trachea after vaccination of day-old SPF chickens without any observable pathogenicity, whereas APMV-3 strain Netherlands showed wide tissue distribution in different body organs (brain, lungs, trachea, and spleen) with mild observable pathogenicity. In terms of immunogenicity, both APMV-3 strain-vaccinated groups showed HI titers two to three fold higher than that induced by APMV-1 strain LaSota vaccinated group. This study offers a novel paramyxovirus vector (APMV-3 strain Wisconsin) which can be used safely for vaccination of young chickens as an alternative for APMV-1 strain LaSota vector.
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Affiliation(s)
- Mohamed A. Elbehairy
- Virginia-Maryland Regional College of Veterinary Medicine, University of Maryland, College Park, MD 20740, USA; (M.A.E.); (S.K.K.)
- Department of Poultry Diseases, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt
| | - Sunil K. Khattar
- Virginia-Maryland Regional College of Veterinary Medicine, University of Maryland, College Park, MD 20740, USA; (M.A.E.); (S.K.K.)
| | - Siba K. Samal
- Virginia-Maryland Regional College of Veterinary Medicine, University of Maryland, College Park, MD 20740, USA; (M.A.E.); (S.K.K.)
- Correspondence: ; Tel.: +1-(301)314-6813
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7
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Retraction: Replication, Neurotropism, and Pathogenicity of Avian Paramyxovirus Serotypes 1-9 in Chickens and Ducks. PLoS One 2020; 15:e0244178. [PMID: 33315960 PMCID: PMC7735484 DOI: 10.1371/journal.pone.0244178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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8
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Meyer M, Yoshida A, Ramanathan P, Saphire EO, Collins PL, Crowe JE, Samal S, Bukreyev A. Antibody Repertoires to the Same Ebola Vaccine Antigen Are Differentially Affected by Vaccine Vectors. Cell Rep 2019; 24:1816-1829. [PMID: 30110638 PMCID: PMC6145141 DOI: 10.1016/j.celrep.2018.07.044] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 05/14/2018] [Accepted: 07/12/2018] [Indexed: 12/18/2022] Open
Abstract
Comparative immune response profiling is important for selecting next-generation vaccines. We comprehensively evaluated the antibody responses from a panel of nine respiratory vaccines against Ebola virus (EBOV) derived from human and avian paramyxoviruses expressing EBOV glycoprotein (GP). Most vaccines were protective in guinea pigs but yielded antibody repertoires that differed in proportion targeting key antigenic regions, avidity, neutralizing antibody specificities, and linear epitope preferences. Competition studies with monoclonal antibodies from human survivors revealed that some epitopes in GP targeted for neutralization were vector dependent, while EBOV-neutralizing titers correlated with the response magnitude toward the receptor-binding domain and GP1/GP2 interface epitopes. While an immunogen determines the breadth of antibody response, distinct vaccine vectors can induce qualitatively different responses, affecting protective efficacy. These data suggest that immune correlates of vaccine protection cannot be generalized for all vaccines against the same pathogen, even if they use the exact same immunogen.
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MESH Headings
- Animals
- Antibodies, Monoclonal/biosynthesis
- Antibodies, Monoclonal/blood
- Antibodies, Neutralizing/biosynthesis
- Antibodies, Neutralizing/blood
- Antibodies, Viral/biosynthesis
- Antibodies, Viral/blood
- Antibody Affinity
- Antibody Specificity
- Antigens, Viral/chemistry
- Antigens, Viral/genetics
- Antigens, Viral/immunology
- Ebola Vaccines/administration & dosage
- Ebola Vaccines/biosynthesis
- Ebola Vaccines/genetics
- Ebolavirus/drug effects
- Ebolavirus/genetics
- Ebolavirus/immunology
- Ebolavirus/pathogenicity
- Epitopes/chemistry
- Epitopes/genetics
- Epitopes/immunology
- Female
- Gene Expression
- Guinea Pigs
- Hemorrhagic Fever, Ebola/immunology
- Hemorrhagic Fever, Ebola/mortality
- Hemorrhagic Fever, Ebola/prevention & control
- Hemorrhagic Fever, Ebola/virology
- Humans
- Immune Sera/chemistry
- Protein Binding
- Receptors, IgG/genetics
- Receptors, IgG/immunology
- Survival Analysis
- Vaccination
- Viral Envelope Proteins/genetics
- Viral Envelope Proteins/immunology
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Affiliation(s)
- Michelle Meyer
- Department of Pathology, University of Texas Medical Branch, Galveston, TX 77555, USA; Galveston National Laboratory, Galveston, TX 77555, USA
| | - Asuka Yoshida
- Virginia-Maryland Regional College of Veterinary Medicine, University of Maryland, MD 20742, USA
| | - Palaniappan Ramanathan
- Department of Pathology, University of Texas Medical Branch, Galveston, TX 77555, USA; Galveston National Laboratory, Galveston, TX 77555, USA
| | - Erica Ollmann Saphire
- Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037, USA; The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Peter L Collins
- RNA Virology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - James E Crowe
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA; Department of Pediatrics (Infectious Diseases), Vanderbilt University Medical Center, Nashville, TN 37232, USA; Vanderbilt Vaccine Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Siba Samal
- Virginia-Maryland Regional College of Veterinary Medicine, University of Maryland, MD 20742, USA
| | - Alexander Bukreyev
- Department of Pathology, University of Texas Medical Branch, Galveston, TX 77555, USA; Galveston National Laboratory, Galveston, TX 77555, USA; Department of Microbiology & Immunology, University of Texas Medical Branch, Galveston, TX 77555, USA.
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9
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Izaguirre G. The Proteolytic Regulation of Virus Cell Entry by Furin and Other Proprotein Convertases. Viruses 2019; 11:v11090837. [PMID: 31505793 PMCID: PMC6784293 DOI: 10.3390/v11090837] [Citation(s) in RCA: 109] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/03/2019] [Accepted: 09/06/2019] [Indexed: 12/11/2022] Open
Abstract
A wide variety of viruses exploit furin and other proprotein convertases (PCs) of the constitutive protein secretion pathway in order to regulate their cell entry mechanism and infectivity. Surface proteins of enveloped, as well as non-enveloped, viruses become processed by these proteases intracellularly during morphogenesis or extracellularly after egress and during entry in order to produce mature virions activated for infection. Although viruses also take advantage of other proteases, it is when some viruses become reactive with PCs that they may develop high pathogenicity. Besides reacting with furin, some viruses may also react with the PCs of the other specificity group constituted by PC4/PC5/PACE4/PC7. The targeting of PCs for inhibition may result in a useful strategy to treat infections with some highly pathogenic viruses. A wide variety of PC inhibitors have been developed and tested for their antiviral activity in cell-based assays.
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Affiliation(s)
- Gonzalo Izaguirre
- College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA.
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10
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Olszewska-Tomczyk M, Dolka I, Świętoń E, Śmietanka K. Genetic Changes in Pigeon Paramyxovirus Type-1 Induced by Serial Passages in Chickens and Microscopic Lesions Caused by the Virus in Various Avian Hosts. J Vet Res 2018; 62:447-455. [PMID: 30729201 PMCID: PMC6364169 DOI: 10.2478/jvetres-2018-0059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 10/25/2018] [Indexed: 12/12/2022] Open
Abstract
INTRODUCTION Genotype VI of avian avulavirus 1 (AAvV-1) has pigeons and doves as its reservoir and is often termed pigeon paramyxovirus type-1 (PPMV-1). The pathogenesis of PPMV-1 infections in poultry is largely obscure. It is known that PPMV-1 requires a series of passages in chickens before it becomes adapted to gallinaceous poultry. MATERIAL AND METHODS Changes in the genome of PPMV-1 were analysed after serial passages in specific pathogen free (SPF) chickens, using high-throughput sequencing. Additionally, histopathological lesions induced by PPMV-1 in experimentally inoculated pigeons, chickens, and turkeys were evaluated. RESULTS Following six passages of PPMV-1 in chickens, 10 nonsynonymous substitutions were found including one (in the NP protein) which dominated the genetic pool of viral quasispecies. Histopathological changes induced by the post-passage PPMV-1 strain were more prominent than changes wrought by the pre-passaged PPMV-1 strain and the lesions were most intense in pigeons followed by chickens and turkeys. CONCLUSION PPMV-1 is highly adapted to pigeons and passaging through chickens results in the acquisition of novel amino acids in the polymerase complex, which may alter the pathogenic potential of the virus.
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Affiliation(s)
| | - Izabella Dolka
- Department of Pathology and Veterinary Diagnostics, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, 02-776Warsaw, Poland
| | - Edyta Świętoń
- Department of Poultry Diseases, National Veterinary Research Institute, 24-100Pulawy, Poland
| | - Krzysztof Śmietanka
- Department of Poultry Diseases, National Veterinary Research Institute, 24-100Pulawy, Poland
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11
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Wang Y, Yu W, Huo N, Wang W, Guo Y, Wei Q, Wang X, Zhang S, Yang Z, Xiao S. Comprehensive analysis of amino acid sequence diversity at the F protein cleavage site of Newcastle disease virus in fusogenic activity. PLoS One 2017; 12:e0183923. [PMID: 28863165 PMCID: PMC5580908 DOI: 10.1371/journal.pone.0183923] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 08/14/2017] [Indexed: 12/16/2022] Open
Abstract
Newcastle disease virus (NDV) is a contagious agent of Newcastle disease in avian species and seriously affects the poultry industry. The cleavage site of the viral F protein (Fcs) is a key determinant of membrane fusion and viral virulence. In this study, we investigated the precise effect of variable amino acid sequences of the Fcs on fusogenic activity. Based on viral pathogenicity, the Fcs sequences of natural isolates (n = 1572) are classified into eight types of virulent Fcs (VFcs) with the motif “G/R/K-R-Q/R/K-R/K-R↓F” and ten types of the avirulent Fcs (AFcs) with the motif “G/R/E-R/K/Q-Q-G/E-R↓L”. The VFcs is only found in the Class II cluster of viral classification and not in Class I. The AFcs exists in both Class I and II isolates. The VFc and AFc types present an evolutionary relationship with temporal distribution and host species. Using a fusion assay in vitro, VFcs-1 “RRQKR↓F” and VFcs-2 “RRQRR↓F” show the highest efficiency in triggering membrane fusion. The neutral residue Q at the P3 position of the VFcs plays an enhancing role compared to effect of the basic residues R and K. A single residue K at P3 or P5 is less efficient of the fusogenic activity in the VFcs with all basic residues. Moreover, the cleavage efficiencies of F0 proteins with different types of Fcs motifs do not appear to affect membrane fusion. Our findings offer insight into the effect of amino acid variation of the Fcs on the fusion triggered by NDV.
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Affiliation(s)
- Yanhong Wang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
| | - Wanqi Yu
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
| | - Na Huo
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
| | - Wenbin Wang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
| | - Yuanyuan Guo
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
| | - Qiaolin Wei
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
| | - Xinglong Wang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
| | - Shuxia Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
| | - Zengqi Yang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
- * E-mail: (ZY); (SX)
| | - Sa Xiao
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
- * E-mail: (ZY); (SX)
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12
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Thampaisarn R, Bui VN, Trinh DQ, Nagai M, Mizutani T, Omatsu T, Katayama Y, Gronsang D, Le DHT, Ogawa H, Imai K. Characterization of avian paramyxovirus serotype 14, a novel serotype, isolated from a duck fecal sample in Japan. Virus Res 2016; 228:46-57. [PMID: 27884627 DOI: 10.1016/j.virusres.2016.11.018] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 11/14/2016] [Accepted: 11/14/2016] [Indexed: 01/11/2023]
Abstract
A hemagglutinating virus isolate designated 11OG0352, was obtained from a duck fecal sample. Genetic and virological analyses indicated that it might represent a novel serotype of avian paramyxovirus (APMV). Electron micrographs showed that the morphology of the virus particle was similar to that of APMV. The complete genome of this virus comprised 15,444 nucleotides complying with the paramyxovirus "rule of six" and contains six open reading frames (3'-N-P-M-F-HN-L-5'). The phylogenetic analysis of the whole genome revealed that the virus was a member of the genus Avulavirus, but that it was distinct from APMV-1 to APMV-13. Although the F-protein cleavage site was TREGK↓L, which resembles a lentogenic strain of APMV-1, the K residue at position -1 of the cleavage site was first discovered in APMV members. The phosphoprotein gene of isolate 11OG0352 contains a putative RNA editing site, 3'-AUUUUCCC-5' (negative sense) which sequence differs from that of other APMVs. The intracerebral pathogenicity index test did not detect virulence in infected chicks. In hemagglutination inhibition (HI) tests, an antiserum against this virus did not detectably react with other APMVs (serotypes 1-4, 6-9) except for low reciprocal cross-reactivity with APMV-6. We designated this isolate, as APMV-14/duck/Japan/11OG0352/2011 and propose that it is a novel APMV serotype. The HI test may not be widely applicable for the classification of a new serotype because of the limited availability of reference antisera against all serotypes and cross-reactivity data. The nucleotide sequence identities of the whole genome of 11OG0352 and other APMVs ranged from 46.3% to 56.1%. Such comparison may provide a useful tool for classifying new APMV isolates. However, the nucleotide sequence identity between APMV-12 and APMV-13 was higher (64%), which was nearly identical to the lowest nucleotide identity (67%) reported in subgroups within the serotype. Therefore, consensus criteria for using whole genome analysis should be established.
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Affiliation(s)
- Rapeewan Thampaisarn
- Diagnostic Center for Animal Health and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan; Faculty of Veterinary Science, Mahidol University, Nakhon Pathom 73170, Thailand
| | - Vuong N Bui
- National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Viet Nam
| | - Dai Q Trinh
- National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Viet Nam
| | - Makoto Nagai
- Research and Education Center for Prevention of Global Infectious Diseases of Animals, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan
| | - Tetsuya Mizutani
- Research and Education Center for Prevention of Global Infectious Diseases of Animals, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan
| | - Tsutomu Omatsu
- Research and Education Center for Prevention of Global Infectious Diseases of Animals, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan
| | - Yukie Katayama
- Research and Education Center for Prevention of Global Infectious Diseases of Animals, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan
| | - Dulyatad Gronsang
- Diagnostic Center for Animal Health and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan; Faculty of Veterinary Science, Mahidol University, Nakhon Pathom 73170, Thailand
| | - Duong H T Le
- Pasteur Institute of Ho Chi Minh City, 167 Pasteur, District 3, Ho Chi Minh City, Viet Nam
| | - Haruko Ogawa
- Diagnostic Center for Animal Health and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan
| | - Kunitoshi Imai
- Diagnostic Center for Animal Health and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan.
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13
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Markosyan RM, Miao C, Zheng YM, Melikyan GB, Liu SL, Cohen FS. Induction of Cell-Cell Fusion by Ebola Virus Glycoprotein: Low pH Is Not a Trigger. PLoS Pathog 2016; 12:e1005373. [PMID: 26730950 PMCID: PMC4711667 DOI: 10.1371/journal.ppat.1005373] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 12/08/2015] [Indexed: 12/11/2022] Open
Abstract
Ebola virus (EBOV) is a highly pathogenic filovirus that causes hemorrhagic fever in humans and animals. Currently, how EBOV fuses its envelope membrane within an endosomal membrane to cause infection is poorly understood. We successfully measure cell-cell fusion mediated by the EBOV fusion protein, GP, assayed by the transfer of both cytoplasmic and membrane dyes. A small molecule fusion inhibitor, a neutralizing antibody, as well as mutations in EBOV GP known to reduce viral infection, all greatly reduce fusion. By monitoring redistribution of small aqueous dyes between cells and by electrical capacitance measurements, we discovered that EBOV GP-mediated fusion pores do not readily enlarge—a marked difference from the behavior of other viral fusion proteins. EBOV GP must be cleaved by late endosome-resident cathepsins B or L in order to become fusion-competent. Cleavage of cell surface-expressed GP appears to occur in endosomes, as evidenced by the fusion block imposed by cathepsin inhibitors, agents that raise endosomal pH, or an inhibitor of anterograde trafficking. Treating effector cells with a recombinant soluble cathepsin B or thermolysin, which cleaves GP into an active form, increases the extent of fusion, suggesting that a fraction of surface-expressed GP is not cleaved. Whereas the rate of fusion is increased by a brief exposure to acidic pH, fusion does occur at neutral pH. Importantly, the extent of fusion is independent of external pH in experiments in which cathepsin activity is blocked and EBOV GP is cleaved by thermolysin. These results imply that low pH promotes fusion through the well-known pH-dependent activity of cathepsins; fusion induced by cleaved EBOV GP is a process that is fundamentally independent of pH. The cell-cell fusion system has revealed some previously unappreciated features of EBOV entry, which could not be readily elucidated in the context of endosomal entry. The devastation and transmissibility of Ebola virus (EBOV) are well known. However, the manner in which EBOV enters host cells through endosomal membrane remains elusive. Here, we have developed a convenient experimental system to mimic EBOV fusion in endosomes: cells expressing the fusion protein of EBOV, GP, on their surface are fused to target cells. This system exhibits the known key properties of EBOV fusion. We show that the pH-dependence of EBOV fusion is caused by the pH-dependence of cathepsins, proteases known to cleave EBOV GP into a fusion-competent form. We demonstrate that the fusion activity of this cleaved form is independent of pH. We further show that the enlargement of the fusion pore created by EBOV GP is unusually slow in reaching sizes necessary to pass EBOV’s genome—this is atypical of virally created fusion pores. This cell-cell fusion system should provide a useful platform for developing drugs against EBOV infection.
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Affiliation(s)
- Ruben M. Markosyan
- Rush University Medical Center, Department of Molecular Biophysics and Physiology, Chicago, Illinois, United States of America
| | - Chunhui Miao
- University of Missouri School of Medicine, Bond Life Sciences Center, Department of Molecular Microbiology and Immunology, Columbia, Missouri, United States of America
| | - Yi-Min Zheng
- University of Missouri School of Medicine, Bond Life Sciences Center, Department of Molecular Microbiology and Immunology, Columbia, Missouri, United States of America
| | - Gregory B. Melikyan
- Emory University Medical School, Department of Pediatrics, Infectious Diseases, Atlanta, Georgia, United States of America
| | - Shan-Lu Liu
- University of Missouri School of Medicine, Bond Life Sciences Center, Department of Molecular Microbiology and Immunology, Columbia, Missouri, United States of America
- * E-mail: (SLL); (FSC)
| | - Fredric S. Cohen
- Rush University Medical Center, Department of Molecular Biophysics and Physiology, Chicago, Illinois, United States of America
- * E-mail: (SLL); (FSC)
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14
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Yamamoto E, Ito H, Tomioka Y, Ito T. Characterization of novel avian paramyxovirus strain APMV/Shimane67 isolated from migratory wild geese in Japan. J Vet Med Sci 2015; 77:1079-85. [PMID: 25866408 PMCID: PMC4591148 DOI: 10.1292/jvms.14-0529] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
An avian paramyxovirus (APMV) isolated from goose feces (APMV/Shimane67) was
biologically, serologically and genetically characterized. APMV/Shimane67 showed typical
paramyxovirus morphology on electron microscopy. On hemagglutination inhibition test,
antiserum against APMV/Shimane67 revealed low reactivity with other APMV serotypes and
vice versa. The fusion (F) protein gene of APMV/Shimane67 contained
1,638 nucleotides in a single open reading frame encoding a protein of 545 amino acids.
The cleavage site of F protein contained a pair of single basic amino
acid (VRENR/L). The nucleotide and deduced amino acid sequences of the F gene
of APMV/Shimane67 had relatively low identities (42.9–62.7% and 28.9–67.3%, respectively)
with those of other APMVs. Phylogenetic analysis showed that APMV/Shimane67 was related to
NDV, APMV-9 and APMV-12, but was distinct from those APMV serotypes. These results suggest
that APMV/Shimane67 is a new APMV serotype, APMV-13.
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Affiliation(s)
- Eiji Yamamoto
- United Graduate School of Veterinary Sciences, Yamaguchi University, Yamaguchi 753-8515, Japan
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15
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Choi KS, Kye SJ, Kim JY, Seul HJ, Lee HS, Kwon HM, Sung HW. Baculovirus expression of the avian paramyxovirus 2 HN gene for diagnostic applications. J Virol Methods 2014; 198:12-7. [PMID: 24374124 DOI: 10.1016/j.jviromet.2013.12.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 12/06/2013] [Accepted: 12/16/2013] [Indexed: 12/21/2022]
Abstract
Avian paramyxovirus 2 (APMV-2) infections are associated with respiratory diseases in poultry worldwide. The hemagglutination inhibition (HI) test is a useful tool for surveillance and monitoring of this virus. In this study, full-length hemagglutinin (HN) gene of APMV-2 was chemically synthesized based on its published sequence, cloned and expressed in Spodoptera frugiperda insect cells using recombinant baculoviruses. The biological, antigenic and immunogenic properties of the expressed protein were evaluated to assess its ability to produce diagnostic reagents for HI testing. Recombinant APMV-2 HN protein showed two distinct bands with molecular masses of 64 and 75kDa, which showed hemagglutination (HA) and neuraminidase activities, respectively. The recombinant HN (rHN) protein extracted from infected cells produced high HA titers (2(13) per 25μL). HA activity of the protein was inhibited by APMV-2 antiserum, although there were weak cross reactions with other APMV serotype antisera. The rHN protein induced high titers of APMV-2-specific antibodies in immunized chickens based on the HI test. These results indicated that recombinant APMV-2 HN protein is a useful alternative to the APMV-2 antigen in HI assays.
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Affiliation(s)
- Kang-Seuk Choi
- OIE Reference Laboratory for Newcastle Disease, Avian Diseases Division, Animal and Plant Quarantine Agency, Anyang 430-757, Republic of Korea
| | - Soo-Jeong Kye
- OIE Reference Laboratory for Newcastle Disease, Avian Diseases Division, Animal and Plant Quarantine Agency, Anyang 430-757, Republic of Korea
| | - Ji-Ye Kim
- OIE Reference Laboratory for Newcastle Disease, Avian Diseases Division, Animal and Plant Quarantine Agency, Anyang 430-757, Republic of Korea
| | - Hee-Jeong Seul
- OIE Reference Laboratory for Newcastle Disease, Avian Diseases Division, Animal and Plant Quarantine Agency, Anyang 430-757, Republic of Korea
| | - Hee-Soo Lee
- OIE Reference Laboratory for Newcastle Disease, Avian Diseases Division, Animal and Plant Quarantine Agency, Anyang 430-757, Republic of Korea
| | - Hyuk-Moo Kwon
- College of Veterinary Medicine & Institute of Veterinary Science, Kangwon National University, Chuncheon, Kangwon 200-701, Republic of Korea
| | - Haan-Woo Sung
- College of Veterinary Medicine & Institute of Veterinary Science, Kangwon National University, Chuncheon, Kangwon 200-701, Republic of Korea.
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16
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Evaluation of the replication, pathogenicity, and immunogenicity of avian paramyxovirus (APMV) serotypes 2, 3, 4, 5, 7, and 9 in rhesus macaques. PLoS One 2013; 8:e75456. [PMID: 24130713 PMCID: PMC3794941 DOI: 10.1371/journal.pone.0075456] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Accepted: 08/15/2013] [Indexed: 11/19/2022] Open
Abstract
Avian paramyxoviruses (APMV) serotypes 1–9 are frequently isolated from domestic and wild birds worldwide. APMV-1 (also called Newcastle disease virus, NDV) is attenuated in non-human primates and is being developed as a candidate human vaccine vector. The vector potential of the other serotypes was unknown. In the present study, we evaluated nine different biologically- or recombinantly-derived APMV strains for the ability to replicate and cause disease in rhesus macaque model. Five of the viruses were: biologically-derived wild type (wt) APMV-2, -3, -5, -7 and -9. Another virus was a recombinant (r) version of wt APMV-4. The remaining three viruses were versions of wt rAPMV-2, -4 and -7 in which the F cleavage site had been modified to be multi-basic. Rhesus macaques were inoculated intranasally and intratracheally and monitored for clinical disease, virus shedding from the upper and lower respiratory tract, and seroconversion. Virus shedding was not detected for wt APMV-5. Very limited shedding was detected for wt rAPMV-4 and modified rAPMV-4, and only in a subset of animals. Shedding by the other viruses was detected in every infected animal, and usually from both the upper and lower respiratory tract. In particular, shedding over a number of days in every animal was observed for modified rAPMV-2, wt APMV-7, and modified rAPMV-7. Modification of the F protein cleavage site appeared to increase shedding by wt rAPMV-2 and marginally by wt rAPMV-4. All APMVs except wt APMV-5 induced a virus-specific serum antibody response in all infected animals. None of the animals exhibited any clinical disease signs. These results indicate that APMVs 2, 3, 4, 7, and 9 are competent to infect non-human primates, but are moderately-to-highly restricted, depending on the serotype. This suggests that they are not likely to significantly infect primates in nature, and represent promising attenuated candidates for vector development.
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17
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Mutations in the fusion protein cleavage site of avian paramyxovirus serotype 4 confer increased replication and syncytium formation in vitro but not increased replication and pathogenicity in chickens and ducks. PLoS One 2013; 8:e50598. [PMID: 23341874 PMCID: PMC3544850 DOI: 10.1371/journal.pone.0050598] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 10/26/2012] [Indexed: 11/19/2022] Open
Abstract
To evaluate the role of the F protein cleavage site in the replication and pathogenicity of avian paramyxoviruses (APMVs), we constructed a reverse genetics system for recovery of infectious recombinant APMV-4 from cloned cDNA. The recovered recombinant APMV-4 resembled the biological virus in growth characteristics in vitro and in pathogenicity in vivo. The F cleavage site sequence of APMV-4 (DIQPR↓F) contains a single basic amino acid, at the -1 position. Six mutant APMV-4 viruses were recovered in which the F protein cleavage site was mutated to contain increased numbers of basic amino acids or to mimic the naturally occurring cleavage sites of several paramyxoviruses, including neurovirulent and avirulent strains of NDV. The presence of a glutamine residue at the -3 position was found to be important for mutant virus recovery. In addition, cleavage sites containing the furin protease motif conferred increased replication and syncytium formation in vitro. However, analysis of viral pathogenicity in 9-day-old embryonated chicken eggs, 1-day-old and 2-week-old chickens, and 3-week-old ducks showed that none the F protein cleavage site mutations altered the replication, tropism, and pathogenicity of APMV-4, and no significant differences were observed among the parental and mutant APMV-4 viruses in vivo. Although parental and mutant viruses replicated somewhat better in ducks than in chickens, they all were highly restricted and avirulent in both species. These results suggested that the cleavage site sequence of the F protein is not a limiting determinant of APMV-4 pathogenicity in chickens and ducks.
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18
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Replication, neurotropism, and pathogenicity of avian paramyxovirus serotypes 1-9 in chickens and ducks. PLoS One 2012; 7:e34927. [PMID: 22558104 DOI: 10.1371/journal.pone.0034927] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 03/08/2012] [Indexed: 11/19/2022] Open
Abstract
Avian paramyxovirus (APMV) serotypes 1-9 have been isolated from many different avian species. APMV-1 (Newcastle disease virus) is the only well-characterized serotype, because of the high morbidity, mortality, and economic loss caused by highly virulent strains. Very little is known about the pathogenesis, replication, virulence, and tropism of the other APMV serotypes. Here, this was evaluated for prototypes strains of APMV serotypes 2-9 in cell culture and in chickens and ducks. In cell culture, only APMV-1, -3 and -5 induced syncytium formation. In chicken DF1 cells, APMV-3 replicated with an efficiency approaching that of APMV-1, while APMV-2 and -5 replicated to lower, intermediate titers and the others were much lower. Mean death time (MDT) assay in chicken eggs and intracerebral pathogenicity index (ICPI) test in 1-day-old SPF chicks demonstrated that APMV types 2-9 were avirulent. Evaluation of replication in primary neuronal cells in vitro as well as in the brains of 1-day-old chicks showed that, among types 2-9, only APMV-3 was neurotropic, although this virus was not neurovirulent. Following intranasal infection of 1-day-old and 2-week-old chickens, replication of APMV types 2-9 was mostly restricted to the respiratory tract, although APMV-3 was neuroinvasive and neurotropic (but not neurovirulent) and also was found in the spleen. Experimental intranasal infection of 3-week-old mallard ducks with the APMVs did not produce any clinical signs (even for APMV-1) and exhibited restricted viral replication of the APMVs (including APMV-1) to the upper respiratory tract regardless of their isolation source, indicating avirulence of APMV types 1-9 in mallard ducks. The link between the presence of a furin cleavage site in the F protein, syncytium formation, systemic spread, and virulence that has been well-established with APMV-1 pathotypes was not evident with the other APMV serotypes.
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19
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Chang A, Dutch RE. Paramyxovirus fusion and entry: multiple paths to a common end. Viruses 2012; 4:613-36. [PMID: 22590688 PMCID: PMC3347325 DOI: 10.3390/v4040613] [Citation(s) in RCA: 145] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Revised: 03/10/2012] [Accepted: 04/12/2012] [Indexed: 12/24/2022] Open
Abstract
The paramyxovirus family contains many common human pathogenic viruses, including measles, mumps, the parainfluenza viruses, respiratory syncytial virus, human metapneumovirus, and the zoonotic henipaviruses, Hendra and Nipah. While the expression of a type 1 fusion protein and a type 2 attachment protein is common to all paramyxoviruses, there is considerable variation in viral attachment, the activation and triggering of the fusion protein, and the process of viral entry. In this review, we discuss recent advances in the understanding of paramyxovirus F protein-mediated membrane fusion, an essential process in viral infectivity. We also review the role of the other surface glycoproteins in receptor binding and viral entry, and the implications for viral infection. Throughout, we concentrate on the commonalities and differences in fusion triggering and viral entry among the members of the family. Finally, we highlight key unanswered questions and how further studies can identify novel targets for the development of therapeutic treatments against these human pathogens.
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Affiliation(s)
| | - Rebecca E. Dutch
- Department of Molecular and Cellular Biochemistry, University of Kentucky College of Medicine, Lexington, KY 40536, USA
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20
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Mutation of the f-protein cleavage site of avian paramyxovirus type 7 results in furin cleavage, fusion promotion, and increased replication in vitro but not increased replication, tissue tropism, or virulence in chickens. J Virol 2012; 86:3828-38. [PMID: 22258248 DOI: 10.1128/jvi.06765-11] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
We constructed a reverse genetics system for avian paramyxovirus serotype 7 (APMV-7) to investigate the role of the fusion F glycoprotein in tissue tropism and virulence. The AMPV-7 F protein has a single basic residue arginine (R) at position -1 in the F cleavage site sequence and also is unusual in having alanine at position +2 (LPSSR↓FA) (underlining indicates the basic amino acids at the F protein cleavage site, and the arrow indicates the site of cleavage.). APMV-7 does not form syncytia or plaques in cell culture, but its replication in vitro does not depend on, and is not increased by, added protease. Two mutants were successfully recovered in which the cleavage site was modified to mimic sites that are found in virulent Newcastle disease virus isolates and to contain 4 or 5 basic residues as well as isoleucine in the +2 position: (RRQKR↓FI) or (RRKKR↓FI), named Fcs-4B or Fcs-5B, respectively. In cell culture, one of the mutants, Fcs-5B, formed protease-independent syncytia and grew to 10-fold-higher titers compared to the parent and Fcs-4B viruses. This indicated the importance of the single additional basic residue (K) at position -3. Syncytium formation and virus yield of the Fcs-5B virus was impaired by the furin inhibitor decanoyl-RVKR-CMK, whereas parental APMV-7 was not affected. APMV-7 is avirulent in chickens and is limited in tropism to the upper respiratory tract of 1-day-old and 2-week-old chickens, and these characteristics were unchanged for the two mutant viruses. Thus, the acquisition of furin cleavability by APMV-7 resulted in syncytium formation and increased virus yield in vitro but did not alter virus yield, tropism, or virulence in chickens.
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21
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Dortmans JCFM, Koch G, Rottier PJM, Peeters BPH. Virulence of Newcastle disease virus: what is known so far? Vet Res 2011; 42:122. [PMID: 22195547 PMCID: PMC3269386 DOI: 10.1186/1297-9716-42-122] [Citation(s) in RCA: 157] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Accepted: 12/23/2011] [Indexed: 12/22/2022] Open
Abstract
In the last decade many studies have been performed on the virulence of Newcastle disease virus (NDV). This is mainly due to the development of reverse genetics systems which made it possible to genetically modify NDV and to investigate the contribution of individual genes and genome regions to its virulence. However, the available information is scattered and a comprehensive overview of the factors and conditions determining NDV virulence is lacking. This review summarises, compares and discusses the available literature and shows that virulence of NDV is a complex trait determined by multiple genetic factors.
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Affiliation(s)
- Jos C F M Dortmans
- Central Veterinary Institute of Wageningen UR, PO Box 65, 8200 AB Lelystad, The Netherlands.
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22
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Roles of the fusion and hemagglutinin-neuraminidase proteins in replication, tropism, and pathogenicity of avian paramyxoviruses. J Virol 2011; 85:8582-96. [PMID: 21680512 DOI: 10.1128/jvi.00652-11] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Virulent and moderately virulent strains of Newcastle disease virus (NDV), representing avian paramyxovirus serotype 1 (APMV-1), cause respiratory and neurological disease in chickens and other species of birds. In contrast, APMV-2 is avirulent in chickens. We investigated the role of the fusion (F) and hemagglutinin-neuraminidase (HN) envelope glycoproteins in these contrasting phenotypes by designing chimeric viruses in which the F and HN glycoproteins or their ectodomains were exchanged individually or together between the moderately virulent, neurotropic NDV strain Beaudette C (BC) and the avirulent APMV-2 strain Yucaipa. When we attempted to exchange the complete F and HN glycoproteins individually and together between the two viruses, the only construct that could be recovered was recombinant APMV-2 strain Yucaipa (rAPMV-2), containing the NDV F glycoprotein in place of its own. This substitution of NDV F into APMV-2 was sufficient to confer the neurotropic, neuroinvasive, and neurovirulent phenotypes, in spite of all being at reduced levels compared to what was seen for NDV-BC. When the ectodomains of F and HN were exchanged individually and together, two constructs could be recovered: NDV, containing both the F and HN ectodomains of APMV-2; and APMV-2, containing both ectodomains of NDV. This supported the idea that homologous cytoplasmic tails and matched F and HN ectodomains are important for virus replication. Analysis of these viruses for replication in vitro, syncytium formation, mean embryo death time, intracerebral pathogenicity index, and replication and tropism in 1-day-old chicks and 2-week-old chickens showed that the two contrasting phenotypes of NDV and APMV-2 could largely be transferred between the two backbones by transfer of homotypic F and HN ectodomains. Further analysis provided evidence that the homologous stalk domain of NDV HN is essential for virus replication, while the globular head domain of NDV HN could be replaced with that of APMV-2 with only a minimal attenuating effect. These results demonstrate that the F and HN ectodomains together determine the cell fusion, tropism, and virulence phenotypes of NDV and APMV-2 and that the regions of HN that are critical to replication and the species-specific phenotypes include the cytoplasmic tail and stalk domain but not the globular head domain.
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