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Mifsud JCO, Lytras S, Oliver MR, Toon K, Costa VA, Holmes EC, Grove J. Mapping glycoprotein structure reveals Flaviviridae evolutionary history. Nature 2024:10.1038/s41586-024-07899-8. [PMID: 39232167 DOI: 10.1038/s41586-024-07899-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Accepted: 08/01/2024] [Indexed: 09/06/2024]
Abstract
Viral glycoproteins drive membrane fusion in enveloped viruses and determine host range, tissue tropism and pathogenesis1. Despite their importance, there is a fragmentary understanding of glycoproteins within the Flaviviridae2, a large virus family that include pathogens such as hepatitis C, dengue and Zika viruses, and numerous other human, animal and emergent viruses. For many flaviviruses the glycoproteins have not yet been identified, for others, such as the hepaciviruses, the molecular mechanisms of membrane fusion remain uncharacterized3. Here we combine phylogenetic analyses with protein structure prediction to survey glycoproteins across the entire Flaviviridae. We find class II fusion systems, homologous to the Orthoflavivirus E glycoprotein in most species, including highly divergent jingmenviruses and large genome flaviviruses. However, the E1E2 glycoproteins of the hepaciviruses, pegiviruses and pestiviruses are structurally distinct, may represent a novel class of fusion mechanism, and are strictly associated with infection of vertebrate hosts. By mapping glycoprotein distribution onto the underlying phylogeny, we reveal a complex evolutionary history marked by the capture of bacterial genes and potentially inter-genus recombination. These insights, made possible through protein structure prediction, refine our understanding of viral fusion mechanisms and reveal the events that have shaped the diverse virology and ecology of the Flaviviridae.
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Affiliation(s)
- Jonathon C O Mifsud
- Sydney Institute for Infectious Diseases, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Spyros Lytras
- MRC-University of Glasgow Centre for Virus Research, Glasgow, UK
- Division of Systems Virology, Department of Microbiology and Immunology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Michael R Oliver
- MRC-University of Glasgow Centre for Virus Research, Glasgow, UK
| | - Kamilla Toon
- MRC-University of Glasgow Centre for Virus Research, Glasgow, UK
| | - Vincenzo A Costa
- Sydney Institute for Infectious Diseases, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Edward C Holmes
- Sydney Institute for Infectious Diseases, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia
- Laboratory of Data Discovery for Health Limited, Hong Kong SAR, China
| | - Joe Grove
- MRC-University of Glasgow Centre for Virus Research, Glasgow, UK.
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2
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Nennig K, Murthy S, Maloney S, Shaw TM, Sharobim M, Matkovic E, Fadiran S, Larsen M, Ramuta MD, Kim AS, Teijaro JR, Grove J, Stremlau M, Sharma H, Trivedi S, Blum MJ, O’Connor DH, Hyde JL, Stapleton JT, Kapoor A, Bailey AL. Determinants of pegivirus persistence, cross-species infection, and adaptation in the laboratory mouse. PLoS Pathog 2024; 20:e1012436. [PMID: 39196893 PMCID: PMC11355568 DOI: 10.1371/journal.ppat.1012436] [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: 04/18/2024] [Accepted: 07/22/2024] [Indexed: 08/30/2024] Open
Abstract
Viruses capable of causing persistent infection have developed sophisticated mechanisms for evading host immunity, and understanding these processes can reveal novel features of the host immune system. One such virus, human pegivirus (HPgV), infects ~15% of the global human population, but little is known about its biology beyond the fact that it does not cause overt disease. We passaged a pegivirus isolate of feral brown rats (RPgV) in immunodeficient laboratory mice to develop a mouse-adapted virus (maPgV) that established persistent high-titer infection in a majority of wild-type laboratory mice. maRPgV viremia was detected in the blood of mice for >300 days without apparent disease, closely recapitulating the hallmarks of HPgV infection in humans. We found a pro-viral role for type-I interferon in chronic infection; a lack of PD-1-mediated tolerance to PgV infection; and multiple mechanisms by which PgV immunity can be achieved by an immunocompetent host. These data indicate that the PgV immune evasion strategy has aspects that are both common and unique among persistent viral infections. The creation of maPgV represents the first PgV infection model in wild-type mice, thus opening the entire toolkit of the mouse host to enable further investigation of this persistent RNA virus infections.
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Affiliation(s)
- Kylie Nennig
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison School of Medicine and Public Health, Madison, Wisconsin, United States of America
| | - Satyapramod Murthy
- Center for Vaccines and Immunity, The Research Institute at Nationwide Children’s Hospital, Columbus, Ohio, United States of America
| | - Sara Maloney
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison School of Medicine and Public Health, Madison, Wisconsin, United States of America
| | - Teressa M. Shaw
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison School of Medicine and Public Health, Madison, Wisconsin, United States of America
| | - Mark Sharobim
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison School of Medicine and Public Health, Madison, Wisconsin, United States of America
| | - Eduard Matkovic
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison School of Medicine and Public Health, Madison, Wisconsin, United States of America
| | - Simi Fadiran
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison School of Medicine and Public Health, Madison, Wisconsin, United States of America
| | - Malorie Larsen
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison School of Medicine and Public Health, Madison, Wisconsin, United States of America
| | - Mitchell D. Ramuta
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison School of Medicine and Public Health, Madison, Wisconsin, United States of America
| | - Arthur S. Kim
- Department of Immunology and Microbiology, The Scripps Research Institute, San Diego, California, United States of America
- Department of Chemistry, The Scripps Research Institute, San Diego, California, United States of America
| | - John R. Teijaro
- Department of Immunology and Microbiology, The Scripps Research Institute, San Diego, California, United States of America
| | - Joe Grove
- MRC-University of Glasgow Center for Virus Research, Glasgow, United Kingdom
| | - Matthew Stremlau
- Brain Science Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Himanshu Sharma
- Center for Vaccines and Immunity, The Research Institute at Nationwide Children’s Hospital, Columbus, Ohio, United States of America
| | - Sheetal Trivedi
- Center for Vaccines and Immunity, The Research Institute at Nationwide Children’s Hospital, Columbus, Ohio, United States of America
| | - Michael J. Blum
- Department of Ecology & Evolutionary Biology, University of Tennessee, Knoxville, Tennessee, United States of America
| | - David H. O’Connor
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison School of Medicine and Public Health, Madison, Wisconsin, United States of America
| | - Jennifer L. Hyde
- Department of Microbiology, University of Washington, Seattle, Washington, United States of America
| | - Jack T. Stapleton
- Department of Internal Medicine, Microbiology & Immunology, University of Iowa and Iowa City Veterans Affairs Healthcare System, Iowa City, Iowa, United States of America
| | - Amit Kapoor
- Center for Vaccines and Immunity, The Research Institute at Nationwide Children’s Hospital, Columbus, Ohio, United States of America
- Department of Pediatrics, College of Medicine and Public Health, Ohio State University, Columbus, Ohio, United States of America
| | - Adam L. Bailey
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison School of Medicine and Public Health, Madison, Wisconsin, United States of America
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3
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Rabiei P, Mohabatkar H, Behbahani M. A label-free G-quadruplex aptamer/gold nanoparticle-based colorimetric biosensor for rapid detection of bovine viral diarrhea virus genotype 1. PLoS One 2024; 19:e0293561. [PMID: 39078832 PMCID: PMC11288453 DOI: 10.1371/journal.pone.0293561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 10/16/2023] [Indexed: 08/02/2024] Open
Abstract
Bovine viral diarrhea virus (BVDV) is the cause of bovine viral diarrhea disease, one of the most economically important livestock diseases worldwide. The majority of BVD disease control programs rely on the detection and then elimination of persistent infection (PI) cattle, as the continuing source of disease. The main purpose of this study was to design and develop an accurate G-quadruplex-based aptasensor for rapid and simple detection of BVDV-1. In this work, we utilized in silico techniques to design a G-quadruplex aptamer specific for the detection of BVDV-1. Also, the rationally designed aptamer was validated experimentally and was used for developing a colorimetric biosensor based on an aptamer-gold nanoparticle system. Firstly, a pool of G-quadruplex forming ssDNA sequences was constructed. Then, based on the stability score in secondary and tertiary structures and molecular docking score, an aptamer (Apt31) was selected. In the experimental part, gold nanoparticles (AuNPs) with an average particle size of 31.7 nm were synthesized and electrostatically linked with the Apt31. The colorimetric test showed that salt-induced color change of AuNPs from red to purple-blue occurs only in the presence of BVDV-Apt31 complex, after 20 min. These results approved the specificity of Apt31 for BVDV. Furthermore, our biosensor could detect the virus at as low as 0.27 copies/ml, which is an acceptable value in comparison to the qPCR method. The specificity of the aptasensor was confirmed through cross-reactivity testing, while its selectivity was confirmed through plasma testing. The sample analysis showed 90% precision and 94% accuracy. It was concluded that the biosensor was adequately sensitive and specific for the detection of BVDV in plasma samples and could be used as a simple and rapid method on the farm.
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Affiliation(s)
- Parisa Rabiei
- Department of Biotechnology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | - Hassan Mohabatkar
- Department of Biotechnology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | - Mandana Behbahani
- Department of Biotechnology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
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4
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Khan SU, Wuryastuty H, Wibowo MH, Sarmin S, Irianingsih SH. Genetic analyses of the structural protein E2 bovine viral diarrhea virus isolated from dairy cattle in Yogyakarta, Indonesia. Vet World 2024; 17:1562-1574. [PMID: 39185050 PMCID: PMC11344113 DOI: 10.14202/vetworld.2024.1562-1574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Accepted: 06/11/2024] [Indexed: 08/27/2024] Open
Abstract
Background and Aim Bovine viral diarrhea (BVD), a highly pathogenic ribonucleic acid (RNA) virus, causes devastating financial losses and reproductive deaths among dairy cattle in Yogyakarta and globally. This study aimed to identify point mutations within the E2 structural protein of the acquired BVD virus (BVDV) isolates using genetic analysis. Materials and Methods The study period shows that we performed the research in 2023. We collected 118 serum samples from 2019 to 2023, among which only 10 BVDV positive were used and 108 were negative lacking the BVDV antigen. An anti-Erns monoclonal antibody-coated protein was used in indirect antigen capture enzyme-linked immunosorbent assay (I-ACE) to detect the BVD antigen present in positive BVDV serum specimens. In the initial step of the two-step reverse transcription polymerase chain reaction, the enzyme (superscript III reverse transcriptase) and the primer (random hexamer) were used to convert the RNA of the BVDV into complementary deoxyribonucleic acid (cDNA) during the process of reverse transcription. The final step involved the amplification of the E2 gene of the resultant BVDV cDNA through gene-specific primers (E2_fwd: 5'-TGGTGGCCTTATGAGAC-3' and P7_rev: 5'-CCCATCATCACTATTTCACC-3') and enzyme (platinum taq DNA polymerase high fidelity). For conducting Sanger sequencing, those 3 BVDV-1-positive isolates (about 2.6% of all isolates) were selected as a typical specimen for each site and year between 2019 and 2023 using a proportional computation. Therefore, only two BVDV isolates with complete genomes were chosen to perform their homological and genetic analysis based on the E2 gene by means of Blast and MEGA Version 11 in addition to the Bioedit 7.2.5 program. Results By applying phylogenetic analysis relying on the E2 gene, a sum of 1011 nucleotides of the BVDV-1 isolates derived from each of the two BVDV-1 Indonesian isolates (n = 2) and its 23 reference BVDV strains were acquired from the National Center for Biotechnology Information (NCBI) database. The findings of the genetic analysis inside the phylogenetic tree revealed that the two BVDV Indonesian isolates were clustered into BVDV-1a subgenotype, while the reference BVDV strains were clustered into the five BVDV subgenotype, BVDV-1a (n = 6), BVDV-1b (n = 3), BVDV-1c (n = 11), BVDV-1m (n = 1), and BVDV-1n (n = 2). The branch exists in phylogenetic tree located before the division of our two BVDV isolates was divided into two branches with the same maximum bootstrap values of 99%, indicating a high degree of confidence, was seen. Next, we observed the branch near our study samples, which displayed the bootstrap value of 100, indicating that our 02 isolates were identical. In both isolates, V11 BVDV1/Indonesia/Yogyakarta/2023 and V16 BVDV1/Indonesia/Yogyakarta/2023 with GenBank accession numbers PP836388 and PP836389, respectively, conserved D7E residues were mutated as well as cysteine changed/altered into serine (S) was identified at amino acid position 201. Conclusion We identified two isolates of BVDV belonging to the BVDV-1a subgenotype. Our findings indicate that the conserved D7E residues of isolates V11 BVDV1/Indonesia/Yogyakarta/2023 and V16 BVDV1/Indonesia/Yogyakarta/2023 were altered. The Indonesian BVDV isolates exhibited a cysteine to serine mutation at amino acid position 201, leads to vaccination failure, range of animal's host will increase, and diagnostic kit will not be effective.
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Affiliation(s)
- S. U. Khan
- Doctoral Study Program, Faculty of Veterinary Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Hastari Wuryastuty
- Department of Veterinary Internal Medicine, Faculty of Veterinary Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - M. H. Wibowo
- Department of Veterinary Microbiology, Faculty of Veterinary Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Sarmin Sarmin
- Department of Veterinary Physiology, Faculty of Veterinary Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
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5
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Aitkenhead H, Riedel C, Cowieson N, Rümenapf HT, Stuart DI, El Omari K. Structural comparison of typical and atypical E2 pestivirus glycoproteins. Structure 2024; 32:273-281.e4. [PMID: 38176409 DOI: 10.1016/j.str.2023.12.003] [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: 06/07/2023] [Revised: 11/02/2023] [Accepted: 12/07/2023] [Indexed: 01/06/2024]
Abstract
Pestiviruses, within the family Flaviviridae, are economically important viruses of livestock. In recent years, new pestiviruses have been reported in domestic animals and non-cloven-hoofed animals. Among them, atypical porcine pestivirus (APPV) and Norway rat pestivirus (NRPV) have relatively little sequence conservation in their surface glycoprotein E2. Despite E2 being the main target for neutralizing antibodies and necessary for cell attachment and viral fusion, the mechanism of viral entry remains elusive. To gain further insights into the pestivirus E2 mechanism of action and to assess its diversity within the genus, we report X-ray structures of the pestivirus E2 proteins from APPV and NRPV. Despite the highly divergent structures, both are able to dimerize through their C-terminal domain and contain a solvent-exposed β-hairpin reported to be involved in host receptor binding. Functional analysis of this β-hairpin in the context of BVDV revealed its ability to rescue viral infectivity.
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Affiliation(s)
- Hazel Aitkenhead
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK; Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0FA, UK; Division of Structural Biology, Nuffield Department of Medicine, University of Oxford, The Wellcome Centre for Human Genetics, Oxford, Oxfordshire OX3 7BN, UK
| | - Christiane Riedel
- CIRI-Centre International de Recherche en Infectiologie, University Lyon, Université Claude Bernard Lyon 1, Inserm, U1111, CNRS, UMR5308, ENS Lyon, 46 allée d'Italie, 69007 Lyon, France
| | - Nathan Cowieson
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK
| | - Hans Tillmann Rümenapf
- Institute of Virology, Department of Pathobiology, University of Veterinary Medicine, 1210 Vienna, Austria
| | - David I Stuart
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK; Division of Structural Biology, Nuffield Department of Medicine, University of Oxford, The Wellcome Centre for Human Genetics, Oxford, Oxfordshire OX3 7BN, UK.
| | - Kamel El Omari
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK; Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0FA, UK.
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6
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Leal ES, Pascual MJ, Adler NS, Arrupe N, Merwaiss F, Giordano L, Fidalgo D, Álvarez D, Bollini M. Unveiling tetrahydroquinolines as promising BVDV entry inhibitors: Targeting the envelope protein. Virology 2024; 590:109968. [PMID: 38141499 DOI: 10.1016/j.virol.2023.109968] [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] [Received: 09/05/2023] [Revised: 11/30/2023] [Accepted: 12/06/2023] [Indexed: 12/25/2023]
Abstract
Bovine viral diarrhea virus (BVDV) is known to cause financial losses and decreased productivity in the cattle industry worldwide. Currently, there are no available antiviral treatments for effectively controlling BVDV infections in laboratories or farms. The BVDV envelope protein (E2) mediates receptor recognition on the cell surface and is required for fusion of virus and cell membranes after the endocytic uptake of the virus during the entry process. Therefore, E2 is an attractive target for the development of antiviral strategies. To identify BVDV antivirals targeting E2 function, we defined a binding site in silico located in domain IIIc at the interface between monomers in the disulfide linked dimer of E2. Employing a de novo design methodology to identify compounds with the potential to inhibit the E2 function, compound 9 emerged as a promising candidate with remarkable antiviral activity and minimal toxicity. In line with targeting of E2 function, compound 9 was found to block the virus entry into host cells. Furthermore, we demonstrated that compound 9 selectively binds to recombinant E2 in vitro. Molecular dynamics simulations (MD) allowed describing a possible interaction pattern between compound 9 and E2 and indicated that the S enantiomer of compound 9 may be responsible for the antiviral activity. Future research endeavors will focus on synthesizing enantiomerically pure compounds to further support these findings. These results highlight the usefulness of de novo design strategies to identify a novel class of BVDV inhibitors that block E2 function inhibiting virus entry into the host cell.
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Affiliation(s)
- Emilse S Leal
- Centro de Investigaciones en Bionanociencias (CIBION)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - María J Pascual
- Instituto de Investigaciones Biotecnológicas, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de San Martín, Argentina
| | - Natalia S Adler
- Centro de Investigaciones en Bionanociencias (CIBION)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Nicolás Arrupe
- Centro de Investigaciones en Bionanociencias (CIBION)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Fernando Merwaiss
- Instituto de Investigaciones Biotecnológicas, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de San Martín, Argentina
| | - Luciana Giordano
- Centro de Investigaciones en Bionanociencias (CIBION)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Daniela Fidalgo
- Centro de Investigaciones en Bionanociencias (CIBION)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Diego Álvarez
- Instituto de Investigaciones Biotecnológicas, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de San Martín, Argentina.
| | - Mariela Bollini
- Centro de Investigaciones en Bionanociencias (CIBION)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
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7
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Xu Q, Ma F, Yang D, Li Q, Yan L, Ou J, Zhang L, Liu Y, Zhan Q, Li R, Wei Q, Hu H, Wang Y, Li X, Zhang S, Yang J, Chai S, Du Y, Wang L, Zhang E, Zhang G. Rice-produced classical swine fever virus glycoprotein E2 with herringbone-dimer design to enhance immune responses. PLANT BIOTECHNOLOGY JOURNAL 2023; 21:2546-2559. [PMID: 37572354 PMCID: PMC10651154 DOI: 10.1111/pbi.14152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 06/15/2023] [Accepted: 07/25/2023] [Indexed: 08/14/2023]
Abstract
Pestiviruses, including classical swine fever virus, remain a concern for global animal health and are responsible for major economic losses of livestock worldwide. Despite high levels of vaccination, currently available commercial vaccines are limited by safety concerns, moderate efficacy, and required high doses. The development of new vaccines is therefore essential. Vaccine efforts should focus on optimizing antigen presentation to enhance immune responses. Here, we describe a simple herringbone-dimer strategy for efficient vaccine design, using the classical swine fever virus E2 expressed in a rice endosperm as an example. The expression of rE2 protein was identified, with the rE2 antigen accumulating to 480 mg/kg. Immunological assays in mice, rabbits, and pigs showed high antigenicity of rE2. Two immunizations with 284 ng of the rE2 vaccine or one shot with 5.12 μg provided effective protection in pigs without interference from pre-existing antibodies. Crystal structure and small-angle X-ray scattering results confirmed the stable herringbone dimeric conformation, which had two fully exposed duplex receptor binding domains. Our results demonstrated that rice endosperm is a promising platform for precise vaccine design, and this strategy can be universally applied to other Flaviviridae virus vaccines.
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Affiliation(s)
- Qianru Xu
- School of Basic Medical SciencesHenan UniversityKaifengChina
- International Joint Research Center of National Animal Immunology, College of Veterinary MedicineHenan Agriculture UniversityZhengzhouChina
- Key Laboratory of Animal ImmunologyHenan Academy of Agricultural SciencesZhengzhouChina
| | - Fanshu Ma
- International Joint Research Center of National Animal Immunology, College of Veterinary MedicineHenan Agriculture UniversityZhengzhouChina
- CAS Key Laboratory of Nano‐Bio Interface, Suzhou Institute of Nano‐Tech and Nano‐BionicsChinese Academy of SciencesSuzhouChina
| | - Daichang Yang
- College of Life ScienceWuhan UniversityWuhanChina
- Wuhan Healthgen Biotechnology Corp.WuhanChina
| | - Qingmei Li
- Key Laboratory of Animal ImmunologyHenan Academy of Agricultural SciencesZhengzhouChina
| | - Liming Yan
- Laboratory of Structural Biology, School of MedicineTsinghua UniversityBeijingChina
| | - Jiquan Ou
- Wuhan Healthgen Biotechnology Corp.WuhanChina
| | - Longxian Zhang
- International Joint Research Center of National Animal Immunology, College of Veterinary MedicineHenan Agriculture UniversityZhengzhouChina
- Longhu LaboratoryZhengzhouChina
| | - Yunchao Liu
- Key Laboratory of Animal ImmunologyHenan Academy of Agricultural SciencesZhengzhouChina
| | - Quan Zhan
- Wuhan Healthgen Biotechnology Corp.WuhanChina
| | - Rui Li
- Key Laboratory of Animal ImmunologyHenan Academy of Agricultural SciencesZhengzhouChina
| | - Qiang Wei
- Key Laboratory of Animal ImmunologyHenan Academy of Agricultural SciencesZhengzhouChina
| | - Hui Hu
- International Joint Research Center of National Animal Immunology, College of Veterinary MedicineHenan Agriculture UniversityZhengzhouChina
| | - Yanan Wang
- Key Laboratory of Animal ImmunologyHenan Academy of Agricultural SciencesZhengzhouChina
| | - Xueyang Li
- International Joint Research Center of National Animal Immunology, College of Veterinary MedicineHenan Agriculture UniversityZhengzhouChina
| | - Shenli Zhang
- International Joint Research Center of National Animal Immunology, College of Veterinary MedicineHenan Agriculture UniversityZhengzhouChina
| | - Jifei Yang
- Key Laboratory of Animal ImmunologyHenan Academy of Agricultural SciencesZhengzhouChina
| | - Shujun Chai
- Key Laboratory of Animal ImmunologyHenan Academy of Agricultural SciencesZhengzhouChina
| | - Yongkun Du
- International Joint Research Center of National Animal Immunology, College of Veterinary MedicineHenan Agriculture UniversityZhengzhouChina
| | - Li Wang
- Key Laboratory of Animal ImmunologyHenan Academy of Agricultural SciencesZhengzhouChina
| | - Erqin Zhang
- International Joint Research Center of National Animal Immunology, College of Veterinary MedicineHenan Agriculture UniversityZhengzhouChina
- Longhu LaboratoryZhengzhouChina
| | - Gaiping Zhang
- International Joint Research Center of National Animal Immunology, College of Veterinary MedicineHenan Agriculture UniversityZhengzhouChina
- Key Laboratory of Animal ImmunologyHenan Academy of Agricultural SciencesZhengzhouChina
- Longhu LaboratoryZhengzhouChina
- School of Advanced Agricultural SciencesPeking UniversityBeijingChina
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8
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Huang YL, Meyer D, Postel A, Tsai KJ, Liu HM, Yang CH, Huang YC, Chang HW, Deng MC, Wang FI, Becher P, Crooke H, Chang CY. Identification of neutralizing epitopes on the D/A domain of the E2 glycoprotein of classical swine fever virus. Virus Res 2023; 336:199209. [PMID: 37633596 PMCID: PMC10485151 DOI: 10.1016/j.virusres.2023.199209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 08/19/2023] [Accepted: 08/23/2023] [Indexed: 08/28/2023]
Abstract
Classical swine fever virus (CSFV) shares high antigenic homology with other members of the genus Pestivirus. Because several pestivirus species can also infect swine, eliciting cross-reactive antibodies, it is important to define CSFV-specific epitopes for the differential diagnosis of classical swine fever (CSF) by serology. For this purpose, epitope mapping of seven monoclonal antibodies (mAbs), recognizing sites on the D/A domain of glycoprotein E2, was performed using recombinant expressed antigenic domains and mutants of E2, as well as an overlapping peptide library. Three CSFV-specific epitopes, i.e., 780-IEEMGDDFGFGLCPF-794, 810-NGSAFYLVCPIGWTG-824, and 846-REKPF-850, were identified within the D/A domain of E2. Site-directed mutagenesis further confirmed that residues 783-MGD-785, 789-FGLCPF-794, 813-AFYLVCPIGWTG-824, and 846-REK-848 were critical residues in these regions. In addition, a F789S difference within the epitope 780-IEEMGDDFGFGLCPF-794 was responsible for the absence of binding of two mAbs to the E2 protein of the live attenuated CSFV vaccine strain Riems. Structural modeling revealed that, the three epitopes are located near each other, suggesting that they may form a more complex conformational epitope on the D/A domain in vivo. Six of the mAbs neutralized viruses of diverse genotypes, indicating that the target epitopes are involved in virus interaction with cells. The binding of CSFV to cells was significantly reduced after pre-incubation with either truncated E2 proteins comprising the D/A domain or with the CSFV-specific mAbs targeting the domain D/A. These epitopes identified on the D/A domain are important targets for virus neutralization that might be involved in the early steps of CSFV infection. These findings reveal potential candidates for improving the differential diagnosis of pestiviruses by serology.
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Affiliation(s)
- Yu-Liang Huang
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Denise Meyer
- WOAH Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Alexander Postel
- WOAH Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Kuo-Jung Tsai
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Hsin-Meng Liu
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Chia-Huei Yang
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Yu-Chun Huang
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Hui-Wen Chang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Ming-Chung Deng
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Fun-In Wang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Paul Becher
- WOAH Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Helen Crooke
- WOAH Reference Laboratory for Classical Swine Fever, Animal and Plant Health Agency, New Haw, Surrey, KT15 3NB, UK.
| | - Chia-Yi Chang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan.
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9
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Pang F, Long Q, Wei M. Immune evasion strategies of bovine viral diarrhea virus. Front Cell Infect Microbiol 2023; 13:1282526. [PMID: 37900320 PMCID: PMC10613064 DOI: 10.3389/fcimb.2023.1282526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 09/25/2023] [Indexed: 10/31/2023] Open
Abstract
Bovine viral diarrhea virus (BVDV) is a significant pathogen that causes great economic losses in the global livestock industry. During the long-term interactions between BVDV and its hosts, the virus has evolved multiple strategies to evade the host's innate immunity and adaptive immunity, thereby promoting viral survival and replication. This review focuses on the most recent research on immune evasion strategies employed by BVDV, including evading type I IFN signaling pathway, evading host adaptive immunity, mediating NF-κB signaling pathway, mediating cell apoptosis and inducing autophagy. Unraveling BVDV's immune evasion strategies will enhance our understanding of the pathogenesis of BVDV and contribute to the development of more effective therapies for the prevention, control and eradication of BVDV.
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Affiliation(s)
- Feng Pang
- Department of Veterinary Medicine, College of Animal Science, Guizhou University, Guiyang, China
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10
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Oliver MR, Toon K, Lewis CB, Devlin S, Gifford RJ, Grove J. Structures of the Hepaci-, Pegi-, and Pestiviruses envelope proteins suggest a novel membrane fusion mechanism. PLoS Biol 2023; 21:e3002174. [PMID: 37432947 PMCID: PMC10335668 DOI: 10.1371/journal.pbio.3002174] [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: 01/19/2023] [Accepted: 05/26/2023] [Indexed: 07/13/2023] Open
Abstract
Enveloped viruses encode specialised glycoproteins that mediate fusion of viral and host membranes. Discovery and understanding of the molecular mechanisms of fusion have been achieved through structural analyses of glycoproteins from many different viruses, and yet the fusion mechanisms of some viral genera remain unknown. We have employed systematic genome annotation and AlphaFold modelling to predict the structures of the E1E2 glycoproteins from 60 viral species in the Hepacivirus, Pegivirus, and Pestivirus genera. While the predicted structure of E2 varied widely, E1 exhibited a very consistent fold across genera, despite little or no similarity at the sequence level. Critically, the structure of E1 is unlike any other known viral glycoprotein. This suggests that the Hepaci-, Pegi-, and Pestiviruses may possess a common and novel membrane fusion mechanism. Comparison of E1E2 models from various species reveals recurrent features that are likely to be mechanistically important and sheds light on the evolution of membrane fusion in these viral genera. These findings provide new fundamental understanding of viral membrane fusion and are relevant to structure-guided vaccinology.
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Affiliation(s)
- Michael R. Oliver
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
| | - Kamilla Toon
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
| | - Charlotte B. Lewis
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
| | - Stephen Devlin
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
| | - Robert J. Gifford
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
| | - Joe Grove
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
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11
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Yi W, Wang H, Qin H, Wang Q, Guo R, Wen G, Pan Z. Construction and efficacy of a new live chimeric C-strain vaccine with DIVA characteristics against classical swine fever. Vaccine 2023; 41:2003-2012. [PMID: 36803898 DOI: 10.1016/j.vaccine.2023.02.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 02/10/2023] [Accepted: 02/13/2023] [Indexed: 02/21/2023]
Abstract
To develop the new classical swine fever (CSF) vaccine candidate with differentiating infected vaccinated animals (DIVA) characteristics, a chimeric CSF virus (CSFV) was constructed based on an infectious cDNA clone of the CSF vaccine C-strain. The 5'- and 3'-untranslated regions (UTRs) and partial E2 region (residues 690-860) of the C-strain were substituted with the corresponding regions of bovine viral diarrhoea virus (BVDV) to construct the chimeric cDNA clone pC/bUTRs-tE2. The chimeric virus rC/bUTRs-tE2 was generated by several passages of pC/bUTRs-tE2-transfected PK15 cells. Stable growth and genetic properties of rC/bUTRs-tE2 were obtained after 30 serial passages. Compared to parental rC/bUTRs-tE2 (1st passage), two residue mutations (M834K and M979K) located in E2 in rC/bUTRs-tE2 P30 were observed. Compared to the C-strain, rC/bUTRs-tE2 exhibited unchanged cell tropism and decreased plaque-forming ability. Substituting the C-strain UTRs with the BVDV UTRs resulted in significantly increased viral replication in PK15 cells. Compared to CSFV Erns-positive and BVDV tE2-negative antibody responses induced by the CSF vaccine C-strain, immunization of rabbits and piglets with rC/bUTRs-tE2 resulted in serological profiles of CSFV Erns- and BVDV tE2-positive antibodies, which are used to serologically discriminate pigs that are clinically infected and vaccinated. Vaccination of piglets with rC/bUTRs-tE2 conferred complete protection against lethal CSFV challenge. Our results suggest that rC/bUTRs-tE2 is a promising new CSF marker vaccine candidate.
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Affiliation(s)
- Weicheng Yi
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Hao Wang
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Huan Qin
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China; Laboratory, Wuhan Children's Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430015, China
| | - Qin Wang
- World Organisation for Animal Health Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, China
| | - Rui Guo
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
| | - Guoyuan Wen
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
| | - Zishu Pan
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China.
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12
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Evaluation of the Mucosal Immunity Effect of Bovine Viral Diarrhea Virus Subunit Vaccine E2Fc and E2Ft. Int J Mol Sci 2023; 24:ijms24044172. [PMID: 36835584 PMCID: PMC9965503 DOI: 10.3390/ijms24044172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/12/2023] [Accepted: 02/12/2023] [Indexed: 02/22/2023] Open
Abstract
Classified as a class B infectious disease by the World Organization for Animal Health (OIE), bovine viral diarrhea/mucosal disease is an acute, highly contagious disease caused by the bovine viral diarrhea virus (BVDV). Sporadic endemics of BVDV often lead to huge economic losses to the dairy and beef industries. To shed light on the prevention and control of BVDV, we developed two novel subunit vaccines by expressing bovine viral diarrhea virus E2 fusion recombinant proteins (E2Fc and E2Ft) through suspended HEK293 cells. We also evaluated the immune effects of the vaccines. The results showed that both subunit vaccines induced an intense mucosal immune response in calves. Mechanistically, E2Fc bonded to the Fc γ receptor (FcγRI) on antigen-presenting cells (APCs) and promoted IgA secretion, leading to a stronger T-cell immune response (Th1 type). The neutralizing antibody titer stimulated by the mucosal-immunized E2Fc subunit vaccine reached 1:64, which was higher than that of the E2Ft subunit vaccine and that of the intramuscular inactivated vaccine. The two novel subunit vaccines for mucosal immunity developed in this study, E2Fc and E2Ft, can be further used as new strategies to control BVDV by enhancing cellular and humoral immunity.
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13
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Zhu J, Wang C, Zhang L, Zhu T, Li H, Wang Y, Xue K, Qi M, Peng Q, Chen Y, Hu C, Chen X, Chen J, Chen H, Guo A. Isolation of BVDV-1a, 1m, and 1v strains from diarrheal calf in china and identification of its genome sequence and cattle virulence. Front Vet Sci 2022; 9:1008107. [PMID: 36467650 PMCID: PMC9709263 DOI: 10.3389/fvets.2022.1008107] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Accepted: 10/10/2022] [Indexed: 08/25/2023] Open
Abstract
Bovine viral diarrhea virus (BVDV) is an important livestock viral pathogen responsible for causing significant economic losses. The emerging and novel BVDV isolates are clinically and biologically important, as there are highly antigenic diverse and pathogenic differences among BVDV genotypes. However, no study has yet compared the virulence of predominant genotype isolates (BVDV-1a, 1b, and 1m) in China and the emerging genotype isolate BVDV-1v. The serological relationship among these genotypes has not yet been described. In this study, we isolated three BVDV isolates from calves with severe diarrhea, characterized as BVDV-1a, 1m, and novel 1v, based on multiple genomic regions [including 5-untranslated region (5'-UTR), Npro, and E2] and the phylogenetic analysis of nearly complete genomes. For the novel genotype, genetic variation analysis of the E2 protein of the BVDV-1v HB-03 strain indicates multiple amino acid mutation sites, including potential host cell-binding sites and neutralizing epitopes. Recombination analysis of the BVDV-1v HB-03 strain hinted at the possible occurrence of cross-genotypes (among 1m, 1o, and 1q) and cross-geographical region transmission events. To compare the pathogenic characters and virulence among these BVDV-1 genotypes, newborn calves uninfected with common pathogens were infected intranasally with BVDV isolates. The calves infected with the three genotype isolates show different symptom severities (diarrhea, fever, slowing weight gain, virus shedding, leukopenia, viremia, and immune-related tissue damage). In addition, these infected calves also showed bovine respiratory disease complexes (BRDCs), such as nasal discharge, coughing, abnormal breathing, and lung damage. Based on assessing different parameters, BVDV-1m HB-01 is identified as a highly virulent strain, and BVDV-1a HN-03 and BVDV-1v HB-03 are both identified as moderately virulent strains. Furthermore, the cross-neutralization test demonstrated the antigenic diversity among these Chinese genotypes (1a, 1m, and 1v). Our findings illustrated the genetic evolution characteristics of the emerging genotype and the pathogenic mechanism and antigenic diversity of different genotype strains, These findings also provided an excellent vaccine candidate strain and a suitable BVDV challenge strain for the comprehensive prevention and control of BVDV.
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Affiliation(s)
- Jie Zhu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
| | - Chen Wang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
| | - Lina Zhang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
| | - Tingting Zhu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
| | - Hanxiong Li
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
| | - Yunqiu Wang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
| | - Kaili Xue
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
| | - Mingpu Qi
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
| | | | - Yingyu Chen
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
| | - Changmin Hu
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Xi Chen
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Jianguo Chen
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Huanchun Chen
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
| | - Aizhen Guo
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Hubei Hongshan Laboratory, Wuhan, China
- Hubei International Scientific and Technological Cooperation Base of Veterinary Epidemiology, Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Wuhan, China
- Key Laboratory of Ruminant Bio-Products of Ministry of Agriculture and Rural Affairs, Huazhong Agriculture University, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, China
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14
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Host Cell Receptors Implicated in the Cellular Tropism of BVDV. Viruses 2022; 14:v14102302. [PMID: 36298858 PMCID: PMC9607657 DOI: 10.3390/v14102302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 10/13/2022] [Accepted: 10/17/2022] [Indexed: 12/02/2022] Open
Abstract
Bovine viral diarrhea virus (BVDV) is one of the most hazardous viruses, which causes huge economic losses in the cattle industry around the world. In recent years, there has been a continuous increase in the diversity of pestivirus worldwide. As a member of the genus Pestivirus in the Flaviviridae family, BVDV has a wide range of host animals including cattle, goat, sheep, pig, camel and other cloven-hoofed animals, and it has multi-tissue tropism as well. The recognition of their permissive cells by viruses via interaction with the cellular receptors is a prerequisite for successful infection. So far, little is known about the cellular receptors essential for BVDV entry and their detailed functions during BVDV infection. Thus, discovery of the cellular receptors involved in the entry of BVDV and other pestiviruses is significant for development of the novel intervention. The viral envelope glycoprotein Erns and E2 are crucial determinants of the cellular tropism of BVDV. The cellular proteins bound with Erns and E2 potentially participate in BVDV entry, and their abundance might determine the cellular tropism of BVDV. Here, we summarize current knowledge regarding the cellular molecules have been described for BVDV entry, such as, complement regulatory protein 46 (CD46), heparan sulfate (HS), the low-density lipoprotein (LDL) receptor, and a disintegrin and metalloproteinase 17 (ADAM17). Furthermore, we focus on their implications of the recently identified cellular receptors for pestiviruses in BVDV life cycle. This knowledge provides a theoretical basis for BVDV prevention and treatment by targeting the cellular receptors essential for BVDV infection.
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15
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Hu M, Wang F, Li N, Xing G, Sun X, Zhang Y, Cao S, Cui N, Zhang G. An antigen display system of GEM nanoparticles based on affinity peptide ligands. Int J Biol Macromol 2021; 193:574-584. [PMID: 34699894 DOI: 10.1016/j.ijbiomac.2021.10.135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 10/08/2021] [Accepted: 10/18/2021] [Indexed: 10/20/2022]
Abstract
Gram-positive enhancer matrix (GEM) nanoparticles are often used in mucosal immunity, preparation of subunit vaccines or as an immune adjuvant due to its good immunological activities in recent years. Here, we designed and screened out a high affinity peptide ligand PL23, which could specifically target the non-epitope region of Classic Swine Fever Virus (CSFV) E2 protein, by virtual screening technology, enzyme linked immunosorbent assay (ELISA) and surface plasmon resonance (SPR) test. The OD value of PL23 at 450 nm was reached 1.982, and the KD value of it was 90.12 nM. Its binding capacity to protein was verified by SDS-PAGE as well. PL23 was subsequently conjugated to GEM nanoparticles by dehydration synthesis generating GEM-PL23 particles, and the GEM-PL-E2 particles were assembled after incubated with CSFV E2 protein. The cytotoxic test indicated that PL23, CSFV E2 protein, GEM nanoparticles, GEM-PL23 particles and GEM-PL-E2 particles were not toxic to cells and GEM nanoparticles could significantly promote the growth of APCs at high concentration for 1 h, p<0.001. In addition, GEM nanoparticles could promote the uptake of antigen by APCs. The cytokines tests suggested that GEM-PL-E2 particles could promote innate immune responses, regulate adaptive immune responses generated by T cells and APCs, and promote the differentiation and maturation of dendritic cells without producing inflammasomes. The results of immunological activity identification showed GEM-PL-E2 particles induced higher levels of both neutralizing antibodies and anti-CSFV antibodies than CSFV E2 protein in mice. This strategy provided a new, simpler, faster and cheaper method for assembling GEM nanoparticles, using an affinity peptide ligand replaced the protein anchor (PA), and provided a better application prospect for the application of GEM particles.
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Affiliation(s)
- Man Hu
- College of Veterinary Medicine, Jilin University, Changchun, Jilin, China; Key Laboratory for Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, Henan, China
| | - Fangyu Wang
- Key Laboratory for Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, Henan, China
| | - Ning Li
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, Henan, China
| | - Guangxu Xing
- Key Laboratory for Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, Henan, China
| | - Xuefeng Sun
- Key Laboratory for Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, Henan, China
| | - Yunshang Zhang
- Key Laboratory for Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, Henan, China
| | - Shuai Cao
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, Henan, China
| | - Ningning Cui
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, Henan, China
| | - Gaiping Zhang
- College of Veterinary Medicine, Jilin University, Changchun, Jilin, China; Key Laboratory for Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, Henan, China.
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16
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Bai Y, Jia R, Wei Q, Wang L, Sun Y, Li Y, Luo J, Zhang G. Development and application of a high-sensitivity immunochromatographic test strip for detecting classical swine fever virus antibodies. Transbound Emerg Dis 2021; 69:e788-e798. [PMID: 34724351 DOI: 10.1111/tbed.14367] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 09/28/2021] [Accepted: 10/12/2021] [Indexed: 11/30/2022]
Abstract
Classical swine fever (CSF) is caused by classical swine fever virus (CSFV) and has led to huge economic losses in the pig industry worldwide. Although vaccination and other control measures have been carried out, it is essential to establish a rapid and valid method for CSF vaccination monitoring and clinical diagnosis. The CSFV E2 protein has been widely used as a major antigen for antibody detection. It is important to improve the affinity between the E2 protein and CSFV antibodies to improve the performance of the detection method. In this study, a recombinant E2 extracellular protein (amino acids 1-331) with a native homodimer conformation and high affinity for the anti-CSFV-E2 monoclonal antibody WH303 was expressed using a Bac-to-Bac baculovirus expression system. A novel immunochromatographic test strip based on the recombinant CSFV E2 protein was developed for CSFV antibody detection. The sensitivity of this strip for detecting CSFV standard-positive serum was 1:102400, 4 times higher than that of the previously developed CnC2 test strip. No cross-reactivity with antibodies of other swine viruses was observed. Detection of clinical swine serum samples (n = 813) demonstrated that the agreements of this E2 test strip with three commercial ELISA kits were 97.17% (790/813), 95.94% (780/813), and 93.73% (762/813), respectively. Our data indicate that a novel E2 test strip with enhanced sensitivity has been developed and can be applied for clinical sample detection, providing a new, powerful and simple approach for CSFV antibody monitoring. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Yilin Bai
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, People's Republic of China.,Key Laboratory of Animal Immunology, Ministry of Agriculture and Rural Affairs & Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, People's Republic of China
| | - Rui Jia
- Key Laboratory of Animal Immunology, Ministry of Agriculture and Rural Affairs & Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, People's Republic of China.,School of Life Sciences, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Qiang Wei
- Key Laboratory of Animal Immunology, Ministry of Agriculture and Rural Affairs & Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, People's Republic of China
| | - Li Wang
- Key Laboratory of Animal Immunology, Ministry of Agriculture and Rural Affairs & Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, People's Republic of China
| | - Yaning Sun
- Key Laboratory of Animal Immunology, Ministry of Agriculture and Rural Affairs & Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, People's Republic of China
| | - Yiwei Li
- College of Animal Science and Technology, Henan Institute of Science and Technology, Xinxiang, 453003, People's Republic of China
| | - Jun Luo
- Key Laboratory of Animal Immunology, Ministry of Agriculture and Rural Affairs & Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, People's Republic of China
| | - Gaiping Zhang
- Key Laboratory of Animal Immunology, Ministry of Agriculture and Rural Affairs & Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, People's Republic of China.,College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, 450002, People's Republic of China.,Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou University, Yangzhou, 225009, People's Republic of China
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17
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Use of multivariate analysis to evaluate antigenic relationships between US BVDV vaccine strains and non-US genetically divergent isolates. J Virol Methods 2021; 299:114328. [PMID: 34710497 DOI: 10.1016/j.jviromet.2021.114328] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 09/27/2021] [Accepted: 10/08/2021] [Indexed: 01/21/2023]
Abstract
Bovine viral diarrhea virus (BVDV) comprises two species, BVDV-1 and BVDV-2. But given the genetic diversity among pestiviruses, at least 22 subgenotypes are described for BVDV-1 and 3-4 for BVDV-2. Genetic characterization is generally accomplished through complete or partial sequencing and phylogeny, but it is not a reliable method to define antigenic relationships. The traditional method for evaluating antigenic relationships between pestivirus isolates is the virus neutralization (VN) assay, but interpretation of the data to define antigenic relatedness can be difficult to discern for BVDV isolates within the same BVDV species. Data from this study utilized a multivariate analysis for visualization of VN results to analyze the antigenic relationships between US vaccine strains and field isolates from Switzerland, Italy, Brazil, and the UK. Polyclonal sera were generated against six BVDV strains currently contained in vaccine formulations, and each serum was used in VNs to measure the titers against seven vaccine strains (including the six homologous strains) and 23 BVDV field isolates. Principal component analysis (PCA) was performed using VN titers, and results were interpreted from PCA clustering within the PCA dendrogram and scatter plot. The results demonstrated clustering patterns among various isolates suggesting antigenic relatedness. As expected, the BVDV-1 and BVDV-2 isolates did not cluster together and had the greatest spatial distribution. Notably, a number of clusters representing antigenically related BVDV-1 subgroups contain isolates of different subgenotypes. The multivariate analysis may be a method to better characterize antigenic relationships among BVDV isolates that belong to the same BVDV species and do not have distinct antigenic differences. This might be an invaluable tool to ameliorate the composition of current vaccines, which might well be important for the success of any BVDV control program that includes vaccination in its scheme.
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Huang YL, Meyer D, Postel A, Tsai KJ, Liu HM, Yang CH, Huang YC, Berkley N, Deng MC, Wang FI, Becher P, Crooke H, Chang CY. Identification of a Common Conformational Epitope on the Glycoprotein E2 of Classical Swine Fever Virus and Border Disease Virus. Viruses 2021; 13:v13081655. [PMID: 34452520 PMCID: PMC8402670 DOI: 10.3390/v13081655] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/17/2021] [Accepted: 08/18/2021] [Indexed: 12/13/2022] Open
Abstract
Classical swine fever virus (CSFV) shares high structural and antigenic homology with bovine viral diarrhea virus (BVDV) and border disease virus (BDV). Because all three viruses can infect swine and elicit cross-reactive antibodies, it is necessary to differentiate among them with regard to serological diagnosis of classical swine fever. To understand the mechanism of cross-reactivity, it is important to define common or specific epitopes of these viruses. For this purpose, epitope mapping of six monoclonal antibodies (mAbs) was performed using recombinant expressed antigenic domains of CSFV and BDV E2 proteins. One CSFV-specific conformational epitope and one CSFV and BDV common epitope within domain B/C of E2 were identified. Site-directed mutagenesis confirmed that residues G725 and V738/I738 of the CSFV-specific epitope and P709/L709 and E713 of the second epitope are important for mAbs binding. Infection of CSFV in porcine cells was significantly reduced after pre-incubation of the cells with the domain B/C of E2 or after pre-incubation of CSFV with the mAbs detecting domain B/C. 3D structural modeling suggested that both epitopes are exposed on the surface of E2. Based on this, the identified epitopes represent a potential target for virus neutralization and might be involved in the early steps of CSFV infection.
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Affiliation(s)
- Yu-Liang Huang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Denise Meyer
- EU and OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; (D.M.); (A.P.); (P.B.)
| | - Alexander Postel
- EU and OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; (D.M.); (A.P.); (P.B.)
| | - Kuo-Jung Tsai
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Hsin-Meng Liu
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Chia-Huei Yang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Yu-Chun Huang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Nicholas Berkley
- OIE Reference Laboratory for Classical Swine Fever, Animal and Plant Health Agency, New Haw KT15 3NB, Surrey, UK;
| | - Ming-Chung Deng
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Fun-In Wang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan;
| | - Paul Becher
- EU and OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; (D.M.); (A.P.); (P.B.)
| | - Helen Crooke
- OIE Reference Laboratory for Classical Swine Fever, Animal and Plant Health Agency, New Haw KT15 3NB, Surrey, UK;
- Correspondence: (H.C.); (C.-Y.C.); Tel.: +44-0-1932-357331 (H.C.); +886-2-2621-2111 (ext. 343) (C.-Y.C.)
| | - Chia-Yi Chang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
- Correspondence: (H.C.); (C.-Y.C.); Tel.: +44-0-1932-357331 (H.C.); +886-2-2621-2111 (ext. 343) (C.-Y.C.)
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19
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Mu Y, Tews BA, Luttermann C, Meyers G. Interaction of Pestiviral E1 and E2 Sequences in Dimer Formation and Intracellular Retention. Int J Mol Sci 2021; 22:ijms22147285. [PMID: 34298900 PMCID: PMC8306095 DOI: 10.3390/ijms22147285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 06/29/2021] [Accepted: 07/03/2021] [Indexed: 11/16/2022] Open
Abstract
Pestiviruses contain three envelope proteins: Erns, E1, and E2. Expression of HA-tagged E1 or mutants thereof showed that E1 forms homodimers and -trimers. C123 and, to a lesser extent, C171, affected the oligomerization of E1 with a double mutant C123S/C171S preventing oligomerization completely. E1 also establishes disulfide linked heterodimers with E2, which are crucial for the recovery of infectious viruses. Co-expression analyses with the HA-tagged E1 wt/E1 mutants and E2 wt/E2 mutants demonstrated that C123 in E1 and C295 in E2 are the critical sites for E1/E2 heterodimer formation. Introduction of mutations preventing E1/E2 heterodimer formation into the full-length infectious clone of BVDV CP7 prevented the recovery of infectious viruses, proving that C123 in E1 and C295 in E2 play an essential role in the BVDV life cycle, and further support the conclusion that heterodimer formation is the crucial step. Interestingly, we found that the retention signal of E1 is mandatory for intracellular localization of the heterodimer, so that absence of the E1 retention signal directs the heterodimer to the cell surface even though the E2 retention signal is still present. The covalent linkage between E1 and E2 plays an essential role for this process.
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Affiliation(s)
- Yu Mu
- Institut für Immunologie, Friedrich-Loeffler-Institut, D-17493 Greifswald-Insel Riems, Germany; (Y.M.); (C.L.)
| | - Birke Andrea Tews
- Institut für Infektionsmedizin, Friedrich-Loeffler-Institut, D-17493 Greifswald-Insel Riems, Germany;
| | - Christine Luttermann
- Institut für Immunologie, Friedrich-Loeffler-Institut, D-17493 Greifswald-Insel Riems, Germany; (Y.M.); (C.L.)
| | - Gregor Meyers
- Institut für Immunologie, Friedrich-Loeffler-Institut, D-17493 Greifswald-Insel Riems, Germany; (Y.M.); (C.L.)
- Correspondence: ; Tel.: +49-(0)-3835-171-0
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20
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The E rns Carboxyterminus: Much More Than a Membrane Anchor. Viruses 2021; 13:v13071203. [PMID: 34201636 PMCID: PMC8310223 DOI: 10.3390/v13071203] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/15/2021] [Accepted: 06/17/2021] [Indexed: 12/12/2022] Open
Abstract
Pestiviruses express the unique essential envelope protein Erns, which exhibits RNase activity, is attached to membranes by a long amphipathic helix, and is partially secreted from infected cells. The RNase activity of Erns is directly connected with pestivirus virulence. Formation of homodimers and secretion of the protein are hypothesized to be important for its role as a virulence factor, which impairs the host's innate immune response to pestivirus infection. The unusual membrane anchor of Erns raises questions with regard to proteolytic processing of the viral polyprotein at the Erns carboxy-terminus. Moreover, the membrane anchor is crucial for establishing the critical equilibrium between retention and secretion and ensures intracellular accumulation of the protein at the site of virus budding so that it is available to serve both as structural component of the virion and factor controlling host immune reactions. In the present manuscript, we summarize published as well as new data on the molecular features of Erns including aspects of its interplay with the other two envelope proteins with a special focus on the biochemistry of the Erns membrane anchor.
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21
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A β-Hairpin Motif in the Envelope Protein E2 Mediates Receptor Binding of Bovine Viral Diarrhea Virus. Viruses 2021; 13:v13061157. [PMID: 34204224 PMCID: PMC8235316 DOI: 10.3390/v13061157] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 06/09/2021] [Accepted: 06/10/2021] [Indexed: 12/29/2022] Open
Abstract
Pestivirus envelope protein E2 is crucial to virus infection and accomplishes virus-receptor interaction during entry. However, mapping of E2 residues mediating these interactions has remained unexplored. In this study, to investigate the structure-function relationship for a β-hairpin motif exposed to the solvent in the crystal structure of bovine viral diarrhea virus (BVDV) E2, we designed two amino acidic substitutions that result in a change of electrostatic potential. First, using wild type and mutant E2 expressed as soluble recombinant proteins, we found that the mutant protein had reduced binding to susceptible cells compared to wild type and diminished ability to inhibit BVDV infection, suggesting a lower affinity for BVDV receptors. We then analyzed the effect of β-hairpin mutations in the context of recombinant viral particles. Mutant viruses recovered from cell culture supernatant after transfection of recombinant RNA had almost completely inhibited ability to re-infect susceptible cells, indicating an impact of mutations on BVDV infectivity. Finally, sequential passaging of the mutant virus resulted in the selection of a viral population in which β-hairpin mutations reverted to the wild type sequence to restore infectivity. Taken together, our results show that this conserved region of the E2 protein is critical for the interaction with host cell receptors.
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22
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Al-Kubati AAG, Hussen J, Kandeel M, Al-Mubarak AIA, Hemida MG. Recent Advances on the Bovine Viral Diarrhea Virus Molecular Pathogenesis, Immune Response, and Vaccines Development. Front Vet Sci 2021; 8:665128. [PMID: 34055953 PMCID: PMC8160231 DOI: 10.3389/fvets.2021.665128] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Accepted: 04/16/2021] [Indexed: 12/20/2022] Open
Abstract
The bovine viral diarrhea virus (BVDV) consists of two species and various subspecies of closely related viruses of varying antigenicity, cytopathology, and virulence-induced pathogenesis. Despite the great ongoing efforts to control and prevent BVDV outbreaks and the emergence of new variants, outbreaks still reported throughout the world. In this review, we are focusing on the molecular biology of BVDV, its molecular pathogenesis, and the immune response of the host against the viral infection. Special attention was paid to discuss some immune evasion strategies adopted by the BVDV to hijack the host immune system to ensure the success of virus replication. Vaccination is one of the main strategies for prophylaxis and contributes to the control and eradication of many viral diseases including BVDV. We discussed the recent advances of various types of currently available classical and modern BVDV vaccines. However, with the emergence of new strains and variants of the virus, it is urgent to find some other novel targets for BVDV vaccines that may overcome the drawbacks of some of the currently used vaccines. Effective vaccination strategy mainly based on the preparation of vaccines from the homologous circulating strains. The BVDV-E2 protein plays important role in viral infection and pathogenesis. We mapped some important potential neutralizing epitopes among some BVDV genomes especially the E2 protein. These novel epitopes could be promising targets against the currently circulating strains of BVDV. More research is needed to further explore the actual roles of these epitopes as novel targets for the development of novel vaccines against BVDV. These potential vaccines may contribute to the global eradication campaign of the BVDV.
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Affiliation(s)
- Anwar A G Al-Kubati
- Department of Microbiology, College of Veterinary Medicine, King Faisal University, Al-Ahsa, Saudi Arabia.,Department of Biomedical Sciences, College of Veterinary Medicine, King Faisal University, Al-Hofuf, Saudi Arabia
| | - Jamal Hussen
- Department of Microbiology, College of Veterinary Medicine, King Faisal University, Al-Ahsa, Saudi Arabia
| | - Mahmoud Kandeel
- Department of Biomedical Sciences, College of Veterinary Medicine, King Faisal University, Al-Hofuf, Saudi Arabia.,Department of Pharmacology, Faculty of Veterinary Medicine, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Abdullah I A Al-Mubarak
- Department of Microbiology, College of Veterinary Medicine, King Faisal University, Al-Ahsa, Saudi Arabia
| | - Maged Gomaa Hemida
- Department of Microbiology, College of Veterinary Medicine, King Faisal University, Al-Ahsa, Saudi Arabia.,Department of Virology, Faculty of Veterinary Medicine, Kafrelsheikh University, Kafrelsheikh, Egypt
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23
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Meingast CL, Joshi PU, Turpeinen DG, Xu X, Holstein M, Feroz H, Ranjan S, Ghose S, Li ZJ, Heldt CL. Physiochemical properties of enveloped viruses and arginine dictate inactivation. Biotechnol J 2021; 16:e2000342. [PMID: 33877739 DOI: 10.1002/biot.202000342] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 03/28/2021] [Accepted: 03/30/2021] [Indexed: 11/06/2022]
Abstract
BACKGROUND Therapeutic protein manufacturing would benefit by having an arsenal of ways to inactivate viruses. There have been many publications on the virus inactivation ability of arginine at pH 4.0, but the mechanism of this inactivation is unknown. This study explored how virus structure and solution conditions enhance virus inactivation by arginine and leads to a better understanding of the mechanism of virus inactivation by arginine. RESULTS Large diameter viruses from the Herpesviridae family (SuHV-1, HSV-1) with loosely packed lipids were highly inactivated by arginine, whereas small diameter, enveloped viruses (equine arteritis virus (EAV) and bovine viral diarrhea virus (BVDV)) with tightly packed lipids were negligibly inactivated by arginine. To increase the inactivation of viruses resistant to arginine, arginine-derivatives and arginine peptides were tested. Derivates and peptides demonstrated that a greater capacity for clustering and added hydrophobicity enhanced virus inactivation. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) detected increases in virus size after arginine exposure, supporting the mechanism of lipid expansion. CONCLUSIONS Arginine most likely interacts with the lipid membrane to cause inactivation. This is shown by larger viruses being more sensitive to inactivation and expansion of the viral size. The enhancement of arginine inactivation when increased hydrophobic molecules are present or arginine is clustered demonstrates a potential mechanism of how arginine interacts with the lipid membrane.
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Affiliation(s)
- Christa L Meingast
- Department of Environmental Engineering, Michigan Technological University, Houghton, Michigan, USA.,Health Research Institute, Michigan Technological University, Houghton, Michigan, USA
| | - Pratik U Joshi
- Health Research Institute, Michigan Technological University, Houghton, Michigan, USA.,Department of Chemical Engineering, Michigan Technological University, Houghton, Michigan, USA
| | - Dylan G Turpeinen
- Health Research Institute, Michigan Technological University, Houghton, Michigan, USA.,Department of Chemical Engineering, Michigan Technological University, Houghton, Michigan, USA
| | - Xuankuo Xu
- Biologics Process Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Melissa Holstein
- Biologics Process Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Hasin Feroz
- Biologics Process Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Swarnim Ranjan
- Biologics Process Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Sanchayita Ghose
- Biologics Process Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Zheng Jian Li
- Biologics Process Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Caryn L Heldt
- Health Research Institute, Michigan Technological University, Houghton, Michigan, USA.,Department of Chemical Engineering, Michigan Technological University, Houghton, Michigan, USA
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24
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Riedel C, Aitkenhead H, El Omari K, Rümenapf T. Atypical Porcine Pestiviruses: Relationships and Conserved Structural Features. Viruses 2021; 13:v13050760. [PMID: 33926056 PMCID: PMC8146772 DOI: 10.3390/v13050760] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 04/23/2021] [Accepted: 04/23/2021] [Indexed: 01/22/2023] Open
Abstract
For two decades, the genus pestivirus has been expanding and the host range now extends to rodents, bats and marine mammals. In this review, we focus on one of the most diverse pestiviruses, atypical porcine pestivirus or pestivirus K, comparing its special traits to what is already known at the structural and functional level from other pestiviruses.
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Affiliation(s)
- Christiane Riedel
- Institute of Virology, Department of Pathobiology, University of Veterinary Medicine Vienna, 1210 Vienna, Austria;
- Correspondence:
| | - Hazel Aitkenhead
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK; (H.A.); (K.E.O.)
- Rutherford Appleton Laboratory, Research Complex at Harwell, Didcot OX11 0FA, UK
| | - Kamel El Omari
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK; (H.A.); (K.E.O.)
- Rutherford Appleton Laboratory, Research Complex at Harwell, Didcot OX11 0FA, UK
| | - Till Rümenapf
- Institute of Virology, Department of Pathobiology, University of Veterinary Medicine Vienna, 1210 Vienna, Austria;
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25
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Genotyping and Molecular Characterization of Classical Swine Fever Virus Isolated in China during 2016-2018. Viruses 2021; 13:v13040664. [PMID: 33921513 PMCID: PMC8069065 DOI: 10.3390/v13040664] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 04/06/2021] [Accepted: 04/07/2021] [Indexed: 12/17/2022] Open
Abstract
Classical swine fever (CSF) is a highly contagious disease of swine caused by classical swine fever virus (CSFV). For decades the disease has been controlled in China by a modified live vaccine (C-strain) of genotype 1. The emergent genotype 2 strains have become predominant in China in the past years that are genetically distant from the vaccine strain. Here, we aimed to evaluate the current infectious status of CSF, and for this purpose 24 isolates of CSFV were identified from different areas of China during 2016–2018. Phylogenetic analysis of NS5B, E2 and full genome revealed that the new isolates were clustered into subgenotype 2.1d and 2.1b, while subgenotype 2.1d was predominant. Moreover, E2 and Erns displayed multiple variations in neutralizing epitope regions. Furthermore, the new isolates exhibited capacity to escape C-strain-derived antibody neutralization compared with the Shimen strain (genotype 1). Potential positive selection sites were identified in antigenic regions of E2 and Erns, which are related with antibody binding affinity. Recombination events were predicted in the new isolates with vaccine strains in the E2 gene region. In conclusion, the new isolates showed molecular variations and antigenic alterations, which provide evidence for the emergence of vaccine-escaping mutants and emphasize the need of updated strategies for CSF control.
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26
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Porcine Complement Regulatory Protein CD46 Is a Major Receptor for Atypical Porcine Pestivirus but Not for Classical Swine Fever Virus. J Virol 2021; 95:JVI.02186-20. [PMID: 33568504 PMCID: PMC8104093 DOI: 10.1128/jvi.02186-20] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 01/28/2021] [Indexed: 01/02/2023] Open
Abstract
Pestiviruses comprise animal pathogens such as classical swine fever virus (CSFV) and bovine viral diarrhea virus (BVDV) that cause notifiable diseases with great economic impact. Several additional pestivirus species affecting animal health were recently identified, including atypical porcine pestivirus (APPV). Pestiviruses such as bovine viral diarrhea virus (BVDV) and classical swine fever virus (CSFV) belong to the family Flaviviridae and represent pathogens of outstanding veterinary relevance. Pestiviruses enter cells via receptor-mediated endocytosis. For entry in bovine cells, complement regulatory protein CD46bov serves as a cellular receptor for BVDV. In this study, the role of porcine CD46pig in cellular entry was investigated for the recently discovered atypical porcine pestivirus (APPV), CSFV, and Bungowannah virus (BuPV) in order to elucidate the observed differences in host cell tropism. A cell culture-adapted APPV variant, which shows enhanced viral replication in vitro, was generated and demonstrated a strict tropism of APPV for porcine cells. One of the porcine cell lines displayed areas of CD46pig-expressing cells and areas of nonexpressing cells, and one single cell line revealed not to express any CD46pig. The CD46pig-deficient porcine lymphoma cell line, known to facilitate CSFV replication, was the only porcine cell line nonpermissive to APPV, indicating a significant difference in the entry mechanism of APPV and CSFV. Infection experiments with a set of genetically engineered CD46pig knockout cells confirmed that CD46pig is a major receptor of APPV as CD46bov is for BVDV. In contrast, it is apparently not an essential determinant in host cell entry of other porcine pestiviruses such as CSFV and BuPV. Existence of a CD46pig-independent entry mechanism illustrates that the pestiviral entry process is more diverse than previously recognized. IMPORTANCE Pestiviruses comprise animal pathogens such as classical swine fever virus (CSFV) and bovine viral diarrhea virus (BVDV) that cause notifiable diseases with great economic impact. Several additional pestivirus species affecting animal health were recently identified, including atypical porcine pestivirus (APPV). APPV is associated with health problems in piglets and is highly abundant in pig populations worldwide. Complement control protein CD46 serves as a receptor for diverse bacterial and viral pathogens, including particular adenoviruses, herpesviruses, measles virus (MeV), and BVDV. Porcine CD46 (CD46pig) was suggested to be a major receptor for CSFV. Here, we identified remarkable differences in relevance of CD46pig during entry of porcine pestiviruses. Resembling BVDV, efficient APPV infection in cell culture depends on CD46pig, while other porcine pestiviruses can efficiently enter and infect cells in the absence of CD46pig. Thus, the study provides insights into the entry process of these pathogens and may help to understand differences in their biology.
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27
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Induction of Robust and Specific Humoral and Cellular Immune Responses by Bovine Viral Diarrhea Virus Virus-Like Particles (BVDV-VLPs) Engineered with Baculovirus Expression Vector System. Vaccines (Basel) 2021; 9:vaccines9040350. [PMID: 33917272 PMCID: PMC8067437 DOI: 10.3390/vaccines9040350] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 01/24/2021] [Accepted: 01/27/2021] [Indexed: 02/02/2023] Open
Abstract
Bovine viral diarrhea virus (BVDV) is an important animal pathogen that affects cattle. Infections caused by the virus have resulted in substantial economic losses and outbreaks of BVDV are reported globally. Virus-like particles (VLPs) are promising vaccine technology largely due to their safety and strong ability to elicit robust immune responses. In this study, we developed a strategy to generate BVDV-VLPs using a baculovirus expression vector system (BEVS). We were able to assemble BVDV-VLPs composed of dimerized viral proteins E2 and Erns, and the VLPs were spherical particles with the diameters of about 50 nm. Mice immunized with 15 μg of VLPs adjuvanted with ISA201 elicited higher levels of E2-specific IgG, IgG1, and IgG2a antibodies as well as higher BVDV-neutralizing activity in comparison with controls. Re-stimulation of the splenocytes collected from mice immunized with VLPs led to significantly increased levels of CD3+CD4+T cells and CD3+CD8+T cells. In addition, the splenocytes showed dramatically enhanced proliferation and the secretion of Th1-associated IFN-γ and Th2-associated IL-4 compared to that of the unstimulated control group. Taken together, our data indicate that BVDV-VLPs efficiently induced BVDV-specific humoral and cellular immune responses in mice, showing a promising potential of developing BVDV-VLP-based vaccines for the prevention of BVDV infections.
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28
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Sangewar N, Waghela SD, Yao J, Sang H, Bray J, Mwangi W. Novel Potent IFN-γ-Inducing CD8 + T Cell Epitopes Conserved among Diverse Bovine Viral Diarrhea Virus Strains. THE JOURNAL OF IMMUNOLOGY 2021; 206:1709-1718. [PMID: 33762324 DOI: 10.4049/jimmunol.2001424] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 02/12/2021] [Indexed: 11/19/2022]
Abstract
Studies of immune responses elicited by bovine viral diarrhea virus (BVDV) vaccines have primarily focused on the characterization of neutralizing B cell and CD4+ T cell epitopes. Despite the availability of commercial vaccines for decades, BVDV prevalence in cattle has remained largely unaffected. There is limited knowledge regarding the role of BVDV-specific CD8+ T cells in immune protection, and indirect evidence suggests that they play a crucial role during BVDV infection. In this study, the presence of BVDV-specific CD8+ T cells that are highly cross-reactive in cattle was demonstrated. Most importantly, novel potent IFN-γ-inducing CD8+ T cell epitopes were identified from different regions of BVDV polyprotein. Eight CD8+ T cell epitopes were identified from the following structural BVDV Ags: Erns, E1, and E2 glycoproteins. In addition, from nonstructural BVDV Ags Npro, NS2-3, NS4A-B, and NS5A-B, 20 CD8+ T cell epitopes were identified. The majority of these IFN-γ-inducing CD8+ T cell epitopes were found to be highly conserved among more than 200 strains from BVDV-1 and -2 genotypes. These conserved epitopes were also validated as cross-reactive because they induced high recall IFN-γ+CD8+ T cell responses ex vivo in purified bovine CD8+ T cells isolated from BVDV-1- and -2-immunized cattle. Altogether, 28 bovine MHC class I-binding epitopes were identified from key BVDV Ags that can elicit broadly reactive CD8+ T cells against diverse BVDV strains. The data presented in this study will lay the groundwork for the development of a contemporary CD8+ T cell-based BVDV vaccine capable of addressing BVDV heterogeneity more effectively than current vaccines.
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Affiliation(s)
- Neha Sangewar
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506; and
| | - Suryakant D Waghela
- Department of Veterinary Pathobiology, Texas A&M University, College Station, TX 77843
| | - Jianxiu Yao
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506; and
| | - Huldah Sang
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506; and
| | - Jocelyn Bray
- Department of Veterinary Pathobiology, Texas A&M University, College Station, TX 77843
| | - Waithaka Mwangi
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506; and
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Fahnøe U, Deng Y, Davids NA, Lohse L, Bukh J, Belsham GJ, Rasmussen TB. Identification of specific amino acid residues in the border disease virus glycoprotein E2 that modify virus growth in pig cells but not in sheep cells. J Gen Virol 2021; 101:1170-1181. [PMID: 32857690 DOI: 10.1099/jgv.0.001483] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Border disease virus (BDV) envelope glycoprotein E2 is required for entry into cells and is a determinant of host tropism for sheep and pig cells. Here, we describe adaptive changes in the BDV E2 protein that modify virus replication in pig cells. To achieve this, two BDV isolates, initially collected from a pig and a sheep on the same farm, were passaged in primary sheep and pig cells in parallel with a rescued variant of the pig virus derived from a cloned full-length BDV cDNA. The pig isolate and the rescued virus shared the same amino acid sequence, but the sheep isolate differed at ten residues, including two substitutions in E2 (K771E and Y925H). During serial passage in cells, the viruses displayed clear selectivity for growth in sheep cells; only the cDNA-derived virus adapted to grow in pig cells. Sequencing revealed an amino acid substitution (Q739R) in the E2 domain DA of this rescued virus. Adaptation at the same residue (Q739K/Q739R) was also observed after passaging of the pig isolate in sheep cells. Use of reverse genetics confirmed that changing residue Q739 to R or K (each positively charged) was sufficient to achieve adaptation to pig cells. Furthermore, this change in host tropism was suppressed if Q739R was combined with K771E. Another substitution (Q728R), conferring an additional positive charge, acquired during passaging, restored the growth of the Q739R/K771E variant. Overall, this study provided evidence that specific, positively charged, residues in the E2 domain DA are crucial for pig-cell tropism of BDV.
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Affiliation(s)
- Ulrik Fahnøe
- Copenhagen Hepatitis C Program (CO-HEP), Department of Infectious Diseases, Hvidovre Hospital and Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen N, Denmark.,DTU National Veterinary Institute, Technical University of Denmark, Lindholm, DK-4771 Kalvehave, Denmark
| | - Yu Deng
- School of Animal Science, Xichang College, Xichang 615013, PR China.,DTU National Veterinary Institute, Technical University of Denmark, Lindholm, DK-4771 Kalvehave, Denmark
| | - Nana A Davids
- Department of Virus & Microbiological Special Diagnostics, Statens Serum Institut, Artillerivej 5, DK-2300 Copenhagen S, Denmark.,DTU National Veterinary Institute, Technical University of Denmark, Lindholm, DK-4771 Kalvehave, Denmark
| | - Louise Lohse
- Department of Virus & Microbiological Special Diagnostics, Statens Serum Institut, Artillerivej 5, DK-2300 Copenhagen S, Denmark.,DTU National Veterinary Institute, Technical University of Denmark, Lindholm, DK-4771 Kalvehave, Denmark
| | - Jens Bukh
- Copenhagen Hepatitis C Program (CO-HEP), Department of Infectious Diseases, Hvidovre Hospital and Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen N, Denmark
| | - Graham J Belsham
- Department of Veterinary and Animal Sciences, University of Copenhagen, Grønnegårdsvej 15, DK-1870 Frederiksberg C, Denmark.,DTU National Veterinary Institute, Technical University of Denmark, Lindholm, DK-4771 Kalvehave, Denmark
| | - Thomas Bruun Rasmussen
- DTU National Veterinary Institute, Technical University of Denmark, Lindholm, DK-4771 Kalvehave, Denmark.,Department of Virus & Microbiological Special Diagnostics, Statens Serum Institut, Artillerivej 5, DK-2300 Copenhagen S, Denmark
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30
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Wei Q, Bai Y, Song Y, Liu Y, Yu W, Sun Y, Wang L, Deng R, Xing G, Zhang G. Generation and immunogenicity analysis of recombinant classical swine fever virus glycoprotein E2 and E rns expressed in baculovirus expression system. Virol J 2021; 18:44. [PMID: 33627167 PMCID: PMC7903030 DOI: 10.1186/s12985-021-01507-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 02/08/2021] [Indexed: 11/12/2022] Open
Abstract
Classical swine fever (CSF) caused by the classical swine fever virus (CSFV) is a highly contagious swine disease resulting in large economical losses worldwide. The viral envelope glycoprotein E2 and Erns are major targets for eliciting antibodies against CSFV in infected animals. In this report, the glycoprotein E2 and Erns were expressed using the baculovirus system and their protective immunity in rabbits were tested. Twenty CSFV seronegative rabbits were randomly divided into five groups. Each rabbit was intramuscularly immunized with CSFV-E2, CSFV-Erns, or their combination (CSFV-E2 + Erns). Besides, a commercial CSFV vaccine (C-strain) and PBS were used as positive or negative controls, respectively. Four weeks after the second immunization, all the rabbits were challenged with 100 RID50 of CSFV C-strain. High levels of CSFV E2-specific antibody, neutralizing antibody and cellular immune responses to CSFV were elicited in the rabbits inoculated with C-strain, CSFV-E2, and CSFV-E2 + Erns. And the rabbits inoculated with the three vaccines received complete protection against CSFV C-strain. However, no neutralizing antibody was detected in the Erns vaccinated rabbits and the rabbits exhibited fever typical of CSFV, suggesting the Erns alone is not able to induce a protective immune response. Taken together, while the Erns could not confer protection against CSFV, E2 and E2 + Erns could not only elicit humoral and cell-mediated immune responses but also confer complete protection against CSFV C-strain in rabbits.
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Affiliation(s)
- Qiang Wei
- Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China
| | - Yilin Bai
- Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China.,College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Yapeng Song
- Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China.,College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, 450002, Henan, China
| | - Yunchao Liu
- Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China
| | - Wei Yu
- Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China.,College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Yaning Sun
- Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China.,Henan Baiao Biological Project Co., Ltd., Zhengzhou, 450002, China
| | - Li Wang
- Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China
| | - Ruiguang Deng
- Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China
| | - Guangxu Xing
- Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China
| | - Gaiping Zhang
- Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China. .,College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, 450002, Henan, China. .,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu Province, China.
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31
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de Oliveira Freitas C, de Oliveira PSB, Monteiro FL, Noll JCG, Silva Júnior JVJ, Weiblen R, Flores EF. Sequence analysis of the DA domain of glycoprotein E2 of pestiviruses isolated from beef cattle in Southern Brazil. Arch Virol 2021; 166:1163-1170. [PMID: 33554289 DOI: 10.1007/s00705-020-04910-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Accepted: 10/23/2020] [Indexed: 10/22/2022]
Abstract
The envelope glycoprotein E2 of pestiviruses is a major target for neutralizing antibodies. In this study, we analyzed the E2 DA domain of 43 pestiviruses from Southern Brazil. The isolates were identified as Bovine viral diarrhea virus (BVDV) subtypes 1a and 1b or BVDV-2b. Compared to reference strains, the BVDV-1 and -2 isolates had four and two mutations in the DA domain, respectively. All BVDV-2 isolates had a deletion of residues 724 and 725. All mutated amino acids in the BVDV isolates had the same aa substitution, and all were in previously identified antibody binding sites. It is possible that an immunity-mediated selection is acting on the pestiviruses circulating in Southern Brazil.
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Affiliation(s)
- Carolina de Oliveira Freitas
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - Pablo Sebastian Britto de Oliveira
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - Francielle Liz Monteiro
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - Jéssica Caroline Gomes Noll
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.,Diel Laboratory, Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, USA
| | - José Valter Joaquim Silva Júnior
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.,Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.,Laboratório de Imunopatologia Keizo Asami, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Rudi Weiblen
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - Eduardo Furtado Flores
- Setor de Virologia, Departamento de Medicina Veterinária Preventiva, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.
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Characterisation of a New Molecule Based on Two E2 Sequences from Bovine Viral Diarrhoea-mucosal Disease Virus Fused To the Human Immunoglobulin Fc Fragment. J Vet Res 2021; 65:27-37. [PMID: 33817392 PMCID: PMC8009577 DOI: 10.2478/jvetres-2021-0006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 12/29/2020] [Indexed: 11/20/2022] Open
Abstract
Introduction Proper conformational arrangement of the E2 molecules of bovine viral diarrhoea-mucosal disease virus (BVD-MDV) is crucial to obtain an effective recombinant vaccine candidate against the disease. In this study, we characterised a new molecule composed of two distinct sequences of the E2 glycoprotein of BVD-MDV and the Fc fragment of human immunoglobulin (BVDE2Fc). Materials and Methods The chimaeric protein was expressed in mammalian cell lines of different species by adenoviral transduction and purified by immobilised metal-affinity chromatography. The N-glycans were profiled by HPLC, and the BVDE2Fc immunogenicity was assessed in male mice. The antigen-antibody reactions were evaluated by ELISA. Results The MDBK cell line was selected from among five for the final production of BVDE2Fc. After purification to over 90%, the N-glycan profile showed neutral and complex oligosaccharides. The mouse immunisation induced a strong humoral response, which produced antibodies able to attach to conformational epitopes on E2 molecules, while the Fc fragment barely contributed to the immune response. Additionally, BVDE2Fc attached to antibodies from bovine sera positive to distinct BVD-MDV subtypes, whereas the loss of BVDE2Fc structure during the deglycosylation process considerably diminished those interactions. Conclusion These results demonstrate that the structure of E2 molecules arranged in tandem and attached to an Fc fragment could represent a viable design for future vaccine candidates against BVD-MD.
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Downstream Sequences Control the Processing of the Pestivirus E rns-E1 Precursor. J Virol 2020; 95:JVI.01905-20. [PMID: 33028718 DOI: 10.1128/jvi.01905-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 09/30/2020] [Indexed: 02/06/2023] Open
Abstract
Like other enveloped viruses, pestiviruses employ cellular proteases for processing of their structural proteins. While typical signal peptidase cleavage motifs are present at the carboxy terminus of the signal sequence preceding Erns and the E1/E2 and E2/P7 sites, the Erns-E1 precursor is cleaved by signal peptidase at a highly unusual structure, in which the transmembrane sequence upstream of the cleavage site is replaced by an amphipathic helix. As shown before, the integrity of the amphipathic helix is crucial for efficient processing. The data presented here demonstrate that the E1 sequence downstream of this cleavage site is also important for the cleavage. Carboxy-terminal truncation of the E1 moiety as well as internal deletions in E1 reduced the cleavage efficiency to less than 30% of the wild-type (wt) level. Moreover, the C-terminal truncation by more than 30 amino acids resulted in strong secretion of the uncleaved fusion proteins. The reduced processing and increased secretion were even observed when 10 to 5 amino-terminal residues of E1 were left, whereas extensions by 1 or 3 E1 residues resulted in reduced processing but no significantly increased secretion. In contrast to the E1 sequences, a 10-amino-acid c-myc tag fused to the Erns C terminus had only marginal effect on secretion but was also not processed efficiently. Mutation of the von Heijne sequence upstream of E2 not only blocked the cleavage between E1 and E2 but also prevented the processing between Erns and E2. Thus, processing at the Erns-E1 site is a highly regulated process.IMPORTANCE Cellular signal peptidase (SPase) cleavage represents an important step in maturation of viral envelope proteins. Fine tuning of this system allows for establishment of concerted folding and processing processes in different enveloped viruses. We report here on SPase processing of the Erns-E1-E2 glycoprotein precursor of pestiviruses. Erns-E1 cleavage is delayed and only executed efficiently when the complete E1 sequence is present. C-terminal truncation of the Erns-E1 precursor impairs processing and leads to significant secretion of the protein. The latter is not detected when internal deletions preserving the E1 carboxy terminus are introduced, but also these constructs show impaired processing. Moreover, Erns-E1 is only processed after cleavage at the E1/E2 site. Thus, processing of the pestiviral glycoprotein precursor by SPase is done in an ordered way and depends on the integrity of the proteins for efficient cleavage. The functional importance of this processing scheme is discussed in the paper.
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34
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Multivariate analysis as a method to evaluate antigenic relationships between BVDV vaccine and field strains. Vaccine 2020; 38:5764-5772. [PMID: 32690424 DOI: 10.1016/j.vaccine.2020.07.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/29/2020] [Accepted: 07/06/2020] [Indexed: 02/08/2023]
Abstract
Bovine viral diarrhea virus (BVDV) is comprised of two species, BVDV-1 and BVDV-2, but given the genetic diversity among pestiviruses, at least 21 subgenotypes are described for BVDV-1 and 4 for BVDV-2. Genetic characterization can be achieved through complete or partial sequencing and phylogeny, but antigenic characterization can be difficult to determine due to the antigenic diversity and cross-neutralization that exists among isolates. The traditional method for evaluating antigenic relationships between pestivirus isolates is the virus neutralization (VN) assay, but interpretation of the data to determine antigenic difference can be unclear. Data from this study utilized a multivariate analysis for visualization of VN results to analyze the antigenic relationships between vaccine strains and multiple field isolates. Polyclonal sera were generated against 6 BVDV strains currently contained in vaccine formulations, and each serum was used in VN's to measure the neutralizing antibody titers against 15 BVDV field isolates characterized as prevalent and divergent subgenotypes in the USA. Principal component analysis (PCA) were performed on the VN assay datasets, and results were interpreted from PCA clustering within the PCA dendrogram and scatter plot. The results demonstrated clustering patterns among isolates suggestive of antigenic differences. While expected, the BVDV-1 and BVDV-2 isolates did not cluster together and had the greatest spatial distribution. In addition, other BVDV isolates had distinct spatial patterns suggesting antigenically divergent isolates. This analysis provides an alternative and more efficient means to analyze large VN datasets to visualize antigenic relationships between pestivirus isolates. This analysis could be beneficial for vaccine development and evaluation of efficacy, since most vaccines cannot fully protect animals from the broad range diversity of BVDV viruses.
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35
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Walz PH, Chamorro MF, M Falkenberg S, Passler T, van der Meer F, R Woolums A. Bovine viral diarrhea virus: An updated American College of Veterinary Internal Medicine consensus statement with focus on virus biology, hosts, immunosuppression, and vaccination. J Vet Intern Med 2020; 34:1690-1706. [PMID: 32633084 PMCID: PMC7517858 DOI: 10.1111/jvim.15816] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 05/11/2020] [Accepted: 05/11/2020] [Indexed: 12/01/2022] Open
Abstract
Control of bovine viral diarrhea virus (BVDV) in cattle populations across most of the world has remained elusive in spite of advances in knowledge about this viral pathogen. A central feature of virus perseverance in cattle herds is the unique mechanism of persistent infection. Managing BVDV infection in herds involves controlling persistently infected carrier animals using a multidimensional approach of vaccination, biosecurity, and identification of BVDV reservoirs. A decade has passed since the original American College of Veterinary Internal Medicine consensus statement on BVDV. While much has remained the same with respect to clinical signs of disease, pathogenesis of infection including persistent infection, and diagnosis, scientific articles published since 2010 have led to a greater understanding of difficulties associated with control of BVDV. This consensus statement update on BVDV presents greater focus on topics currently relevant to the biology and control of this viral pathogen of cattle, including changes in virus subpopulations, infection in heterologous hosts, immunosuppression, and vaccination.
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Affiliation(s)
- Paul H Walz
- College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
| | - Manuel F Chamorro
- College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
| | - Shollie M Falkenberg
- USDA Agricultural Research Service, National Animal Disease Center, Ames, Iowa, USA
| | - Thomas Passler
- College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
| | - Frank van der Meer
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Amelia R Woolums
- College of Veterinary Medicine, Mississippi State University, Starkville, Mississippi, USA
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36
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Kuca T, Passler T, Newcomer BW, Neill JD, Galik PK, Riddell KP, Zhang Y, Bayles DO, Walz PH. Changes Introduced in the Open Reading Frame of Bovine Viral Diarrhea Virus During Serial Infection of Pregnant Swine. Front Microbiol 2020; 11:1138. [PMID: 32587582 PMCID: PMC7298064 DOI: 10.3389/fmicb.2020.01138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 05/05/2020] [Indexed: 12/27/2022] Open
Abstract
Bovine viral diarrhea virus (BVDV) is one of the most economically important viruses of cattle, but this pathogen is also able to infect pigs, camelids, and a wide range of domestic and wild ruminants. BVDV isolates circulating in animal populations are genetically and antigenically highly diverse. Acute BVDV infections in cattle cause the introduction of many substitutions in the viral genome. Serial infection of pregnant sheep with a BVDV-1b isolate of bovine origin was also associated with great numbers of substitutions. To our knowledge, genomic changes arising during BVDV infections in swine have not been investigated. The purpose of this study was to investigate the changes occurring in the open reading frame (ORF) of BVDV during serial infection of pregnant swine with a BVDV isolate of bovine origin. The BVDV-1b isolate AU526 was serially passaged in six pregnant gilts, two of which gave birth to live piglets congenitally infected with BVDV. The complete ORF sequences of 14 BVDV isolates obtained from pregnant gilts and their piglets were determined. Their analysis revealed that serial transmission of AU526 in pregnant swine resulted in many genomic changes. All isolates of porcine origin shared 32 nucleotide and 12 amino acid differences with the virus inoculum AU526. These changes were detected after a single passage in pregnant swine and were conserved during the subsequent five passages. Amino acid changes occurred primarily in genomic regions encoding the BVDV structural proteins E2 and E rns . These results suggest that BVDV infections in pregnant swine may contribute significantly to the genetic variability of BVDV and lead to the appearance of adaptive changes.
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Affiliation(s)
- Thibaud Kuca
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - Thomas Passler
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - Benjamin W Newcomer
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - John D Neill
- Ruminant Diseases and Immunology Research Unit, National Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Ames, IA, United States
| | - Patricia K Galik
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - Kay P Riddell
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - Yijing Zhang
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
| | - Darrell O Bayles
- Infectious Bacterial Diseases Research Unit, National Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Ames, IA, United States
| | - Paul H Walz
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL, United States
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Mi X, Bromley EK, Joshi PU, Long F, Heldt CL. Virus Isoelectric Point Determination Using Single-Particle Chemical Force Microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:370-378. [PMID: 31845814 DOI: 10.1021/acs.langmuir.9b03070] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Virus colloidal behavior is governed by the interaction of the viral surface and the surrounding environment. One method to characterize the virus surface charge is the isoelectric point (pI). Traditional determination of virus pI has focused on the bulk characterization of a viral solution. However, virus capsids are extremely heterogeneous, and a single-particle method may give more information on the range of surface charge observed across a population. One method to measure the virus pI is chemical force microscopy (CFM). CFM is a single-particle technique that measures the adhesion force of a functionalized atomic force microscope (AFM) probe and, in this case, a virus covalently bound to a surface. Non-enveloped porcine parvovirus (PPV) and enveloped bovine viral diarrhea virus (BVDV) were used to demonstrate the use of CFM for viral particles with different surface properties. We have validated the CFM to determine the pI of PPV to be 4.8-5.1, which has a known pI value of 5.0 in the literature, and to predict the unknown pI of BVDV to be 4.3-4.5. Bulk measurements, ζ-potential, and aqueous two-phase system (ATPS) cross-partitioning methods were also used to validate the new CFM method for the virus pI. Most methods were in good agreement. CFM can detect the surface charge of viral capsids at a single-particle level and enable the comparison of surface charge between different types of viruses.
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Virus Adaptation and Selection Following Challenge of Animals Vaccinated against Classical Swine Fever Virus. Viruses 2019; 11:v11100932. [PMID: 31658773 PMCID: PMC6833067 DOI: 10.3390/v11100932] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 09/30/2019] [Accepted: 10/09/2019] [Indexed: 01/15/2023] Open
Abstract
Vaccines against classical swine fever have proven very effective in protecting pigs from this deadly disease. However, little is known about how vaccination impacts the selective pressures acting on the classical swine fever virus (CSFV). Here we use high-throughput sequencing of viral genomes to investigate evolutionary changes in virus populations following the challenge of naïve and vaccinated pigs with the highly virulent CSFV strain “Koslov”. The challenge inoculum contained an ensemble of closely related viral sequences, with three major haplotypes being present, termed A, B, and C. After the challenge, the viral haplotype A was preferentially located within the tonsils of naïve animals but was highly prevalent in the sera of all vaccinated animals. We find that the viral population structure in naïve pigs after infection is very similar to that in the original inoculum. In contrast, the viral population in vaccinated pigs, which only underwent transient low-level viremia, displayed several distinct changes including the emergence of 16 unique non-synonymous single nucleotide polymorphisms (SNPs) that were not detectable in the challenge inoculum. Further analysis showed a significant loss of heterogeneity and an increasing positive selection acting on the virus populations in the vaccinated pigs. We conclude that vaccination imposes a strong selective pressure on viruses that subsequently replicate within the vaccinated animal.
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Riedel C, Lamp B, Chen HW, Heimann M, Rümenapf T. Fluorophore labelled BVDV: a novel tool for the analysis of infection dynamics. Sci Rep 2019; 9:5972. [PMID: 30979966 PMCID: PMC6461705 DOI: 10.1038/s41598-019-42540-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 04/03/2019] [Indexed: 11/10/2022] Open
Abstract
Genetic labelling of viruses with a fluorophore allows to study their life cycle in real time, without the need for fixation or staining techniques. Within the family Flaviviridae, options for genetic labelling of non-structural proteins exist. Yet, no system to genetically label structural proteins has been put forward to date. Taking advantage of a previously described site within the structural protein E2, a fluorophore was introduced into a cytopathogenic (cpe) BVDV-1 virus (BVDVE2_fluo). This insertion was well tolerated, resulting in a 2-fold drop in titer compared to the parental virus, and remained stably integrated into the genome for more than 10 passages. The fluorophore E2 fusion protein was readily detectable in purified virus particles by Western blot and fluorescence microscopy and the particle integrity and morphology was confirmed by cryo electron microscopy. The same integration site could also be used to label the related Classical swine fever virus. Also, BVDVE2_fluo particles bound to fluorophore labelled CD46 expressing cells could be resolved in fluorescence microscopy. This underlines the applicability of BVDVE2_fluo as a tool to study the dynamics of the whole life cycle of BVDV in real time.
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Affiliation(s)
- Christiane Riedel
- Institute of Virology, Department of Pathobiology, University of Veterinary Medicine Vienna, Vienna, Austria.
| | - Benjamin Lamp
- Institute of Virology, Department of Pathobiology, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Hann-Wei Chen
- Institute of Virology, Department of Pathobiology, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Manuela Heimann
- Institute of Anatomy, Faculty of Veterinary Medicine, Justus-Liebig University, Giessen, Germany
| | - Till Rümenapf
- Institute of Virology, Department of Pathobiology, University of Veterinary Medicine Vienna, Vienna, Austria
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40
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Moustafa RI, Dubuisson J, Lavie M. Function of the HCV E1 envelope glycoprotein in viral entry and assembly. Future Virol 2019. [DOI: 10.2217/fvl-2018-0180] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
HCV envelope glycoproteins, E1 and E2, are multifunctional proteins. Until recently, E2 glycoprotein was thought to be the fusion protein and was the focus of investigations. However, the recently obtained partial structures of E2 and E1 rather support a role for E1 alone or in association with E2 in HCV fusion. Moreover, they suggest that HCV harbors a new fusion mechanism, distinct from that of other members of the Flaviviridae family. In this context, E1 aroused a renewed interest. Recent functional characterizations of E1 revealed a more important role than previously thought in entry and assembly. Thus, E1 is involved in the viral genome encapsidation step and influences the association of the virus with lipoprotein components. Moreover, E1 modulates HCV–receptor interaction and participates in a late entry step potentially fusion. In this review, we outline our current knowledge on E1 functions in HCV assembly and entry.
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Affiliation(s)
- Rehab I Moustafa
- Université de Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019 – UMR 8204 – CIIL– Centre d'Infection et d'Immunité de Lille, F-59000 Lille, France
- Department of Microbial Biotechnology, Genetic Engineering & Biotechnology Division, National Research Center, Dokki, Cairo, Egypt
| | - Jean Dubuisson
- Université de Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019 – UMR 8204 – CIIL– Centre d'Infection et d'Immunité de Lille, F-59000 Lille, France
| | - Muriel Lavie
- Université de Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019 – UMR 8204 – CIIL– Centre d'Infection et d'Immunité de Lille, F-59000 Lille, France
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41
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Rey FA, Lok SM. Common Features of Enveloped Viruses and Implications for Immunogen Design for Next-Generation Vaccines. Cell 2019. [PMID: 29522750 PMCID: PMC7112304 DOI: 10.1016/j.cell.2018.02.054] [Citation(s) in RCA: 158] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Enveloped viruses enter cells by inducing fusion of viral and cellular membranes, a process catalyzed by a specialized membrane-fusion protein expressed on their surface. This review focuses on recent structural studies of viral fusion proteins with an emphasis on their metastable prefusion form and on interactions with neutralizing antibodies. The fusion glycoproteins have been difficult to study because they are present in a labile, metastable form at the surface of infectious virions. Such metastability is a functional requirement, allowing these proteins to refold into a lower energy conformation while transferring the difference in energy to catalyze the membrane fusion reaction. Structural studies have shown that stable immunogens presenting the same antigenic sites as the labile wild-type proteins efficiently elicit potently neutralizing antibodies, providing a framework with which to engineer the antigens for stability, as well as identifying key vulnerability sites that can be used in next-generation subunit vaccine design.
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Affiliation(s)
- Felix A Rey
- Institut Pasteur, Structural Virology Unit, CNRS UMR3569, 25-28 rue du Dr. Roux, 75015 Paris, France.
| | - Shee-Mei Lok
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543, Singapore AND Duke-NUS Medical School, 8 College Road, Singapore 169857, Singapore.
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42
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Neill JD, Workman AM, Hesse R, Bai J, Porter EP, Meadors B, Anderson J, Bayles DO, Falkenberg SM. Identification of BVDV2b and 2c subgenotypes in the United States: Genetic and antigenic characterization. Virology 2018; 528:19-29. [PMID: 30553108 DOI: 10.1016/j.virol.2018.12.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 12/03/2018] [Accepted: 12/03/2018] [Indexed: 01/22/2023]
Abstract
Bovine viral diarrhea virus (BVDV), a ubiquitous pathogen of cattle, causes subclinical to severe acute disease. Two species of BVDV are recognized, BVDV1 and BVDV2 with BVDV1 divided into at least 21 subgenotypes and BVDV2 into 3-4 subgenotypes, most commonly using sequences from the 5' untranslated region (5' UTR). We report genomic sequencing of 8 BVDV2 isolates that did not segregate into the 2a subgenotype; but represented two additional BVDV2 subgenotypes. One BVDV2 subgenotype was previously recognized only in Asia. The other seven viruses fell into a second subgenotype that was first reported in Brazil and the U.S. in 2002. Neutralization assays using antiserum raised against vaccine strain BVDV2a 296c revealed varying degrees of neutralization of genetically diverse BVDV2 isolates. Neutralization titers decreased from 1.8 to more than a four log(2) decrease. This study illustrated the considerable genetic and antigenic diversity in BVDV2 circulating in the U.S.
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Affiliation(s)
- John D Neill
- Ruminant Diseases and Immunology Research Unit, National Animal Disease Center, USDA, ARS, Ames, IA 50010, USA.
| | - Aspen M Workman
- US Meat Animal Research Center, USDA, ARS, Clay Center, NE 68933, USA
| | - Richard Hesse
- Kansas State Veterinary Diagnostic Laboratory, Kansas State University, Manhattan, KS, 66502 USA
| | - Jianfa Bai
- Kansas State Veterinary Diagnostic Laboratory, Kansas State University, Manhattan, KS, 66502 USA
| | - Elizabeth Poulsen Porter
- Kansas State Veterinary Diagnostic Laboratory, Kansas State University, Manhattan, KS, 66502 USA
| | - Barbara Meadors
- Kansas State Veterinary Diagnostic Laboratory, Kansas State University, Manhattan, KS, 66502 USA
| | - Joe Anderson
- Kansas State Veterinary Diagnostic Laboratory, Kansas State University, Manhattan, KS, 66502 USA
| | - Darrell O Bayles
- Ruminant Diseases and Immunology Research Unit, National Animal Disease Center, USDA, ARS, Ames, IA 50010, USA
| | - Shollie M Falkenberg
- Ruminant Diseases and Immunology Research Unit, National Animal Disease Center, USDA, ARS, Ames, IA 50010, USA
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Identification of structural glycoprotein E2 domain critical to mediate replication of Classical Swine Fever Virus in SK6 cells. Virology 2018; 526:38-44. [PMID: 30340154 DOI: 10.1016/j.virol.2018.10.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 09/12/2018] [Accepted: 10/02/2018] [Indexed: 11/21/2022]
Abstract
Envelope glycoprotein E2 of Classical Swine Fever Virus (CSFV) is involved in several critical virus functions. To analyze the role of E2 in virus replication, a series of recombinant CSFVs harboring chimeric forms of E2 CSFV and Bovine viral diarrhea virus (BVDV) were created and tested for their ability to infect swine or bovine cell lines. Substitution of native CSFV E2 by BVDV E2 abrogates virus replication in both cell lines. Substitution of individual domains in CSFV Brescia E2 by the homologous from BVDV produces chimeras that efficiently replicate in SK6 cells with the exception of a chimera harboring BVDV E2 residues 93-168. Further mapping revealed a critical area in E2 required for CSFV replication in SK6 cells between protein residues 136-156. This is the first report categorically defining a discrete portion of E2 as essential to pestivirus infection in susceptible cells.
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44
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Tong Y, Lavillette D, Li Q, Zhong J. Role of Hepatitis C Virus Envelope Glycoprotein E1 in Virus Entry and Assembly. Front Immunol 2018; 9:1411. [PMID: 29971069 PMCID: PMC6018474 DOI: 10.3389/fimmu.2018.01411] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 06/06/2018] [Indexed: 12/22/2022] Open
Abstract
Hepatitis C virus (HCV) glycoproteins E1 and E2 form a heterodimer to constitute viral envelope proteins, which play an essential role in virus entry. E1 does not directly interact with host receptors, and its functions in viral entry are exerted mostly through its interaction with E2 that directly binds the receptors. HCV enters the host cell via receptor-mediated endocytosis during which the fusion of viral and host endosomal membranes occurs to release viral genome to cytoplasm. A putative fusion peptide in E1 has been proposed to participate in membrane fusion, but its exact role and underlying molecular mechanisms remain to be deciphered. Recently solved crystal structures of the E2 ectodomains and N-terminal of E1 fail to reveal a classical fusion-like structure in HCV envelope glycoproteins. In addition, accumulating evidence suggests that E1 also plays an important role in virus assembly. In this mini-review, we summarize current knowledge on HCV E1 including its structure and biological functions in virus entry, fusion, and assembly, which may provide clues for developing HCV vaccines and more effective antivirals.
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Affiliation(s)
- Yimin Tong
- Unit of Viral Hepatitis, CAS Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
| | - Dimitri Lavillette
- Unit of Interspecies Transmission of Arboviruses and Antivirals, CAS Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Qingchao Li
- Unit of Viral Hepatitis, CAS Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Jin Zhong
- Unit of Viral Hepatitis, CAS Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
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45
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Li Y, Xie L, Zhang L, Wang X, Li C, Han Y, Hu S, Sun Y, Li S, Luo Y, Liu L, Munir M, Qiu HJ. The E2 glycoprotein is necessary but not sufficient for the adaptation of classical swine fever virus lapinized vaccine C-strain to the rabbit. Virology 2018; 519:197-206. [PMID: 29734043 DOI: 10.1016/j.virol.2018.04.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 04/14/2018] [Accepted: 04/21/2018] [Indexed: 12/26/2022]
Abstract
Classical swine fever virus (CSFV) C-strain was developed through hundreds of passages of a highly virulent CSFV in rabbits. To investigate the molecular basis for the adaptation of C-strain to the rabbit (ACR), a panel of chimeric viruses with the exchange of glycoproteins Erns, E1, and/or E2 between C-strain and the highly virulent Shimen strain and a number of mutant viruses with different amino acid substitutions in E2 protein were generated and evaluated in rabbits. Our results demonstrate that Shimen-based chimeras expressing Erns-E1-E2, Erns-E2 or E1-E2 but not Erns-E1, Erns, E1, or E2 of C-strain can replicate in rabbits, indicating that E2 in combination with either Erns or E1 confers the ACR. Notably, E2 and the amino acids P108 and T109 in Domain I of E2 are critical in ACR. Collectively, our data indicate that E2 is crucial in mediating the ACR, which requires synergistic contribution of Erns or E1.
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Affiliation(s)
- Yongfeng Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Libao Xie
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Lingkai Zhang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Xiao Wang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Chao Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yuying Han
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Shouping Hu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yuan Sun
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Su Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yuzi Luo
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Lihong Liu
- Department of Microbiology, National Veterinary Institute (SVA), Uppsala, Sweden
| | - Muhammad Munir
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, United Kingdom
| | - Hua-Ji Qiu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China.
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46
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Bollini M, Leal ES, Adler NS, Aucar MG, Fernández GA, Pascual MJ, Merwaiss F, Alvarez DE, Cavasotto CN. Discovery of Novel Bovine Viral Diarrhea Inhibitors Using Structure-Based Virtual Screening on the Envelope Protein E2. Front Chem 2018; 6:79. [PMID: 29632860 PMCID: PMC5879447 DOI: 10.3389/fchem.2018.00079] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 03/08/2018] [Indexed: 02/04/2023] Open
Abstract
Bovine viral diarrhea virus (BVDV) is a member of the genus Pestivirus within the family Flaviviridae. BVDV causes both acute and persistent infections in cattle, leading to substantial financial losses to the livestock industry each year. The global prevalence of persistent BVDV infection and the lack of a highly effective antiviral therapy have spurred intensive efforts to discover and develop novel anti-BVDV therapies in the pharmaceutical industry. Antiviral targeting of virus envelope proteins is an effective strategy for therapeutic intervention of viral infections. We performed prospective small-molecule high-throughput docking to identify molecules that likely bind to the region delimited by domains I and II of the envelope protein E2 of BVDV. Several structurally different compounds were purchased or synthesized, and assayed for antiviral activity against BVDV. Five of the selected compounds were active displaying IC50 values in the low- to mid-micromolar range. For these compounds, their possible binding determinants were characterized by molecular dynamics simulations. A common pattern of interactions between active molecules and aminoacid residues in the binding site in E2 was observed. These findings could offer a better understanding of the interaction of BVDV E2 with these inhibitors, as well as benefit the discovery of novel and more potent BVDV antivirals.
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Affiliation(s)
- Mariela Bollini
- Laboratorio de Química Medicinal, Centro de Investigaciones en Bionanociencias, Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
| | - Emilse S Leal
- Laboratorio de Química Medicinal, Centro de Investigaciones en Bionanociencias, Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
| | - Natalia S Adler
- Laboratory of Computational Chemistry and Drug Design, Instituto de Investigación en Biomedicina de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Partner Institute of the Max Planck Society, Ciudad de Buenos Aires, Argentina
| | - María G Aucar
- Laboratory of Computational Chemistry and Drug Design, Instituto de Investigación en Biomedicina de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Partner Institute of the Max Planck Society, Ciudad de Buenos Aires, Argentina
| | - Gabriela A Fernández
- Laboratorio de Química Medicinal, Centro de Investigaciones en Bionanociencias, Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
| | - María J Pascual
- Instituto de Investigaciones Biotecnológicas, Universidad Nacional de San Martín, Consejo Nacional de Investigaciones Científicas y Técnicas, San Martín, Argentina
| | - Fernando Merwaiss
- Instituto de Investigaciones Biotecnológicas, Universidad Nacional de San Martín, Consejo Nacional de Investigaciones Científicas y Técnicas, San Martín, Argentina
| | - Diego E Alvarez
- Instituto de Investigaciones Biotecnológicas, Universidad Nacional de San Martín, Consejo Nacional de Investigaciones Científicas y Técnicas, San Martín, Argentina
| | - Claudio N Cavasotto
- Laboratory of Computational Chemistry and Drug Design, Instituto de Investigación en Biomedicina de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Partner Institute of the Max Planck Society, Ciudad de Buenos Aires, Argentina
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47
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An improved indirect ELISA for specific detection of antibodies against classical swine fever virus based on structurally designed E2 protein expressed in suspension mammalian cells. Arch Virol 2018; 163:1831-1839. [DOI: 10.1007/s00705-018-3809-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Accepted: 02/03/2018] [Indexed: 10/17/2022]
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48
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Douam F, Fusil F, Enguehard M, Dib L, Nadalin F, Schwaller L, Hrebikova G, Mancip J, Mailly L, Montserret R, Ding Q, Maisse C, Carlot E, Xu K, Verhoeyen E, Baumert TF, Ploss A, Carbone A, Cosset FL, Lavillette D. A protein coevolution method uncovers critical features of the Hepatitis C Virus fusion mechanism. PLoS Pathog 2018; 14:e1006908. [PMID: 29505618 PMCID: PMC5854445 DOI: 10.1371/journal.ppat.1006908] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 03/15/2018] [Accepted: 01/26/2018] [Indexed: 12/15/2022] Open
Abstract
Amino-acid coevolution can be referred to mutational compensatory patterns preserving the function of a protein. Viral envelope glycoproteins, which mediate entry of enveloped viruses into their host cells, are shaped by coevolution signals that confer to viruses the plasticity to evade neutralizing antibodies without altering viral entry mechanisms. The functions and structures of the two envelope glycoproteins of the Hepatitis C Virus (HCV), E1 and E2, are poorly described. Especially, how these two proteins mediate the HCV fusion process between the viral and the cell membrane remains elusive. Here, as a proof of concept, we aimed to take advantage of an original coevolution method recently developed to shed light on the HCV fusion mechanism. When first applied to the well-characterized Dengue Virus (DENV) envelope glycoproteins, coevolution analysis was able to predict important structural features and rearrangements of these viral protein complexes. When applied to HCV E1E2, computational coevolution analysis predicted that E1 and E2 refold interdependently during fusion through rearrangements of the E2 Back Layer (BL). Consistently, a soluble BL-derived polypeptide inhibited HCV infection of hepatoma cell lines, primary human hepatocytes and humanized liver mice. We showed that this polypeptide specifically inhibited HCV fusogenic rearrangements, hence supporting the critical role of this domain during HCV fusion. By combining coevolution analysis and in vitro assays, we also uncovered functionally-significant coevolving signals between E1 and E2 BL/Stem regions that govern HCV fusion, demonstrating the accuracy of our coevolution predictions. Altogether, our work shed light on important structural features of the HCV fusion mechanism and contributes to advance our functional understanding of this process. This study also provides an important proof of concept that coevolution can be employed to explore viral protein mediated-processes, and can guide the development of innovative translational strategies against challenging human-tropic viruses. Several virus-mediated molecular processes remain poorly described, which dampen the development of potent anti-viral therapies. Hence, new experimental strategies need to be undertaken to improve and accelerate our understanding of these processes. Here, as a proof of concept, we employ amino-acid coevolution as a tool to gain insights into the structural rearrangements of Hepatitis C Virus (HCV) envelope glycoproteins E1 and E2 during virus fusion with the cell membrane, and provide a basis for the inhibition of this process. Our coevolution analysis predicted that a specific domain of E2, the Back Layer (BL) is involved into significant conformational changes with E1 during the fusion of the HCV membrane with the cellular membrane. Consistently, a recombinant, soluble form of the BL was able to inhibit E1E2 fusogenic rearrangements and HCV infection. Moreover, predicted coevolution networks involving E1 and BL residues, as well as E1 and BL-adjacent residues, were found to modulate virus fusion. Our data shows that coevolution analysis is a powerful and underused approach that can provide significant insights into the functions and structural rearrangements of viral proteins. Importantly, this approach can also provide structural and molecular basis for the design of effective anti-viral drugs, and opens new perspectives to rapidly identify effective antiviral strategies against emerging and re-emerging viral pathogens.
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Affiliation(s)
- Florian Douam
- CIRI–International Center for Infectiology Research, Team EVIR, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Univ Lyon, Lyon, France
- CNRS UMR5557 Microbial ecology, Université Claude Bernard Lyon 1, INRA, UMR1418, Villeurbanne, France
- Department of Molecular Biology, Princeton University, Princeton NJ, United States of America
| | - Floriane Fusil
- CIRI–International Center for Infectiology Research, Team EVIR, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Univ Lyon, Lyon, France
| | - Margot Enguehard
- CNRS UMR5557 Microbial ecology, Université Claude Bernard Lyon 1, INRA, UMR1418, Villeurbanne, France
- University of Lyon, Université Claude Bernard Lyon1, INRA, EPHE, IVPC, Viral Infections and Comparative Pathology, UMR754, Lyon, France
- Institut Hospitalo-Universitaire, Pôle Hépato-digestif, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Linda Dib
- Molecular Phylogenetics and Speciation, Département d’écologie et évolution, Université de Lausanne, Lausanne, Suisse
| | - Francesca Nadalin
- Sorbonne Université, CNRS, IBPS, UMR 7238, Laboratoire de Biologie Computationnelle et Quantitative, Paris, France
| | - Loïc Schwaller
- Mathematical Institute, Leiden University, Leiden, The Netherlands
| | - Gabriela Hrebikova
- Department of Molecular Biology, Princeton University, Princeton NJ, United States of America
| | - Jimmy Mancip
- CIRI–International Center for Infectiology Research, Team EVIR, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Univ Lyon, Lyon, France
| | - Laurent Mailly
- Inserm, U1110, Institut de Recherche sur les Maladies Virales et Hépatiques, Strasbourg, France
- Université de Strasbourg, Strasbourg, France
| | - Roland Montserret
- Institut de Biologie et Chimie des Protéines, Bases Moléculaires et Structurales des Systèmes Infectieux, Labex Ecofect, UMR 5086 CNRS, Université de Lyon, Lyon, France
| | - Qiang Ding
- Department of Molecular Biology, Princeton University, Princeton NJ, United States of America
| | - Carine Maisse
- University of Lyon, Université Claude Bernard Lyon1, INRA, EPHE, IVPC, Viral Infections and Comparative Pathology, UMR754, Lyon, France
| | - Emilie Carlot
- CAS Key Laboratory of Molecular Virology and Immunology, Unit of interspecies transmission of arboviruses and antivirals, Institut Pasteur of Shanghai, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Ke Xu
- CAS Key Laboratory of Molecular Virology and Immunology, Unit of interspecies transmission of arboviruses and antivirals, Institut Pasteur of Shanghai, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Els Verhoeyen
- CIRI–International Center for Infectiology Research, Team EVIR, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Univ Lyon, Lyon, France
| | - Thomas F. Baumert
- Institut Hospitalo-Universitaire, Pôle Hépato-digestif, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
- Inserm, U1110, Institut de Recherche sur les Maladies Virales et Hépatiques, Strasbourg, France
- Université de Strasbourg, Strasbourg, France
| | - Alexander Ploss
- Department of Molecular Biology, Princeton University, Princeton NJ, United States of America
| | - Alessandra Carbone
- Sorbonne Université, CNRS, IBPS, UMR 7238, Laboratoire de Biologie Computationnelle et Quantitative, Paris, France
- Institut Universitaire de France, Paris, France
- * E-mail: (FLC); (AC); (DL)
| | - François-Loïc Cosset
- CIRI–International Center for Infectiology Research, Team EVIR, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Univ Lyon, Lyon, France
- * E-mail: (FLC); (AC); (DL)
| | - Dimitri Lavillette
- CIRI–International Center for Infectiology Research, Team EVIR, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Univ Lyon, Lyon, France
- CNRS UMR5557 Microbial ecology, Université Claude Bernard Lyon 1, INRA, UMR1418, Villeurbanne, France
- University of Lyon, Université Claude Bernard Lyon1, INRA, EPHE, IVPC, Viral Infections and Comparative Pathology, UMR754, Lyon, France
- CAS Key Laboratory of Molecular Virology and Immunology, Unit of interspecies transmission of arboviruses and antivirals, Institut Pasteur of Shanghai, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
- * E-mail: (FLC); (AC); (DL)
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Wetzel D, Rolf T, Suckow M, Kranz A, Barbian A, Chan JA, Leitsch J, Weniger M, Jenzelewski V, Kouskousis B, Palmer C, Beeson JG, Schembecker G, Merz J, Piontek M. Establishment of a yeast-based VLP platform for antigen presentation. Microb Cell Fact 2018; 17:17. [PMID: 29402276 PMCID: PMC5798182 DOI: 10.1186/s12934-018-0868-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Accepted: 01/27/2018] [Indexed: 12/26/2022] Open
Abstract
Background Chimeric virus-like particles (VLP) allow the display of foreign antigens on their surface and have proved valuable in the development of safe subunit vaccines or drug delivery. However, finding an inexpensive production system and a VLP scaffold that allows stable incorporation of diverse, large foreign antigens are major challenges in this field. Results In this study, a versatile and cost-effective platform for chimeric VLP development was established. The membrane integral small surface protein (dS) of the duck hepatitis B virus was chosen as VLP scaffold and the industrially applied and safe yeast Hansenula polymorpha (syn. Pichia angusta, Ogataea polymorpha) as the heterologous expression host. Eight different, large molecular weight antigens of up to 412 amino acids derived from four animal-infecting viruses were genetically fused to the dS and recombinant production strains were isolated. In all cases, the fusion protein was well expressed and upon co-production with dS, chimeric VLP containing both proteins could be generated. Purification was accomplished by a downstream process adapted from the production of a recombinant hepatitis B VLP vaccine. Chimeric VLP were up to 95% pure on protein level and contained up to 33% fusion protein. Immunological data supported surface exposure of the foreign antigens on the native VLP. Approximately 40 mg of chimeric VLP per 100 g dry cell weight could be isolated. This is highly comparable to values reported for the optimized production of human hepatitis B VLP. Purified chimeric VLP were shown to be essentially stable for 6 months at 4 °C. Conclusions The dS-based VLP scaffold tolerates the incorporation of a variety of large molecular weight foreign protein sequences. It is applicable for the display of highly immunogenic antigens originating from a variety of pathogens. The yeast-based production system allows cost-effective production that is not limited to small-scale fundamental research. Thus, the dS-based VLP platform is highly efficient for antigen presentation and should be considered in the development of future vaccines.
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Affiliation(s)
- David Wetzel
- ARTES Biotechnology GmbH, Elisabeth-Selbert-Straße 9, 40764, Langenfeld, Germany. .,Laboratory of Plant and Process Design, Technical University of Dortmund, Emil-Figge-Straße 70, 44227, Dortmund, Germany.
| | - Theresa Rolf
- ARTES Biotechnology GmbH, Elisabeth-Selbert-Straße 9, 40764, Langenfeld, Germany
| | - Manfred Suckow
- ARTES Biotechnology GmbH, Elisabeth-Selbert-Straße 9, 40764, Langenfeld, Germany
| | - Andreas Kranz
- ARTES Biotechnology GmbH, Elisabeth-Selbert-Straße 9, 40764, Langenfeld, Germany
| | - Andreas Barbian
- Institute for Anatomy I, Düsseldorf University Hospital, Moorenstraße 5, 40225, Düsseldorf, Germany
| | - Jo-Anne Chan
- Burnet Institute for Medical Research and Public Health, 85 Commercial Road, Melbourne, VIC, 3004, Australia
| | - Joachim Leitsch
- ARTES Biotechnology GmbH, Elisabeth-Selbert-Straße 9, 40764, Langenfeld, Germany
| | - Michael Weniger
- ARTES Biotechnology GmbH, Elisabeth-Selbert-Straße 9, 40764, Langenfeld, Germany
| | - Volker Jenzelewski
- ARTES Biotechnology GmbH, Elisabeth-Selbert-Straße 9, 40764, Langenfeld, Germany
| | - Betty Kouskousis
- Burnet Institute for Medical Research and Public Health, 85 Commercial Road, Melbourne, VIC, 3004, Australia
| | - Catherine Palmer
- Burnet Institute for Medical Research and Public Health, 85 Commercial Road, Melbourne, VIC, 3004, Australia
| | - James G Beeson
- Burnet Institute for Medical Research and Public Health, 85 Commercial Road, Melbourne, VIC, 3004, Australia
| | - Gerhard Schembecker
- Laboratory of Plant and Process Design, Technical University of Dortmund, Emil-Figge-Straße 70, 44227, Dortmund, Germany
| | - Juliane Merz
- Laboratory of Plant and Process Design, Technical University of Dortmund, Emil-Figge-Straße 70, 44227, Dortmund, Germany
| | - Michael Piontek
- ARTES Biotechnology GmbH, Elisabeth-Selbert-Straße 9, 40764, Langenfeld, Germany
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Bhuyan AA, Memon AM, Bhuiyan AA, Zhonghua L, Zhang B, Ye S, Mengying L, He QG. The construction of recombinant Lactobacillus casei expressing BVDV E2 protein and its immune response in mice. J Biotechnol 2018; 270:51-60. [PMID: 29408654 DOI: 10.1016/j.jbiotec.2018.01.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 01/24/2018] [Accepted: 01/24/2018] [Indexed: 10/18/2022]
Abstract
Bovine viral diarrhea virus (BVDV) is the etiological agent of BVD causes substantial economic losses and endemic in world-wide cattle population. Mucosal immunity plays an important role in protection against BVDV infection and Lactobacillus casei is believed as an excellent live vaccine vector for expressing foreign genes. In this study, we have constructed a novel recombinant L. casei/pELX1-E2 strain expressing the most immunogenic E2 antigen of BVDV; using growth phage dependent surface expression system pELX1. The expression of E2 protein was verified by SDS-PAGE, Western blotting, and Immunofluorescence microscopic analysis. The immune responses triggered by the E2 producing recombinant L. casei were evaluated in BALB/c mice revealed that oral and intranasal (IN) administration of the recombinant strain was able to induce a significantly higher level of specific anti-E2 mucosal IgA and serum IgG as well as the greater level of cellular response by IFN-γ and IL-12 than those of intramuscular (IM) and control groups of mice. However, IN inoculation was found the most potent route of immunization. The ability of the recombinant strain to induce serum neutralizing antibody against BVDV and reduced viral load after viral challenge indicated better protection of BVDV infection. Therefore, this recombinant L. casei expressing E2 could be a safe and promising mucosal vaccine candidate against BVD.
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Affiliation(s)
- Anjuman Ara Bhuyan
- State Key Laboratory of Agricultural Microbiology, Ministry of Education, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China; National Institute of Biotechnology, Savar, Dhaka, 1349, Bangladesh.
| | - Atta Muhammad Memon
- State Key Laboratory of Agricultural Microbiology, Ministry of Education, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Ali Akbar Bhuiyan
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China; Bangladesh Livestock Research Institute, Savar, Dhaka, 1341, Bangladesh.
| | - Li Zhonghua
- State Key Laboratory of Agricultural Microbiology, Ministry of Education, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Bingzhou Zhang
- State Key Laboratory of Agricultural Microbiology, Ministry of Education, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Shiyi Ye
- State Key Laboratory of Agricultural Microbiology, Ministry of Education, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Li Mengying
- State Key Laboratory of Agricultural Microbiology, Ministry of Education, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Qi-Gai He
- State Key Laboratory of Agricultural Microbiology, Ministry of Education, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China.
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