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Abstract
Despite tight genetic compression, viral genomes are often organized into functional gene clusters, a modular structure that might favor their evolvability. This has greatly facilitated biotechnological developments such as the recombinant adeno-associated virus (AAV) systems for gene therapy. Following this lead, we endeavored to engineer the related insect parvovirus Junonia coenia densovirus (JcDV) to create addressable vectors for insect pest biocontrol. To enable safer manipulation of capsid mutants, we translocated the nonstructural (ns) gene cluster outside the viral genome. To our dismay, this yielded a virtually nonreplicable clone. We linked the replication defect to an unexpected modularity breach, as ns translocation truncated the overlapping 3' untranslated region (UTR) of the capsid transcript (vp). We found that the native vp 3' UTR is necessary for high-level VP production but that decreased expression does not adversely impact the expression of NS proteins, which are known replication effectors. As nonsense vp mutations recapitulate the replication defect, VP proteins appear to be directly implicated in the replication process. Our findings suggest intricate replication-encapsidation couplings that favor the maintenance of genetic integrity. We discuss possible connections with an intriguing cis-packaging phenomenon previously observed in parvoviruses whereby capsids preferentially package the genome from which they were expressed. IMPORTANCE Densoviruses could be used as biological control agents to manage insect pests. Such applications require an in-depth biological understanding and associated molecular tools. However, the genomes of these viruses remain difficult to manipulate due to poorly tractable secondary structures at their extremities. We devised a construction strategy that enables precise and efficient molecular modifications. Using this approach, we endeavored to create a split clone of Junonia coenia densovirus (JcDV) that can be used to safely study the impact of capsid mutations on host specificity. Our original construct proved to be nonfunctional. Fixing this defect led us to uncover that capsid proteins and their correct expression are essential for continued rolling-hairpin replication. This points to an intriguing link between replication and packaging, which might be shared with related viruses. This serendipitous discovery illustrates the power of synthetic biology approaches to advance our knowledge of biological systems.
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Shao L, Shen W, Wang S, Qiu J. Recent Advances in Molecular Biology of Human Bocavirus 1 and Its Applications. Front Microbiol 2021; 12:696604. [PMID: 34220786 PMCID: PMC8242256 DOI: 10.3389/fmicb.2021.696604] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Accepted: 05/12/2021] [Indexed: 11/25/2022] Open
Abstract
Human bocavirus 1 (HBoV1) was discovered in human nasopharyngeal specimens in 2005. It is an autonomous human parvovirus and causes acute respiratory tract infections in young children. HBoV1 infects well differentiated or polarized human airway epithelial cells in vitro. Unique among all parvoviruses, HBoV1 expresses 6 non-structural proteins, NS1, NS1-70, NS2, NS3, NS4, and NP1, and a viral non-coding RNA (BocaSR), and three structural proteins VP1, VP2, and VP3. The BocaSR is the first identified RNA polymerase III (Pol III) transcribed viral non-coding RNA in small DNA viruses. It plays an important role in regulation of viral gene expression and a direct role in viral DNA replication in the nucleus. HBoV1 genome replication in the polarized/non-dividing airway epithelial cells depends on the DNA damage and DNA repair pathways and involves error-free Y-family DNA repair DNA polymerase (Pol) η and Pol κ. Importantly, HBoV1 is a helper virus for the replication of dependoparvovirus, adeno-associated virus (AAV), in polarized human airway epithelial cells, and HBoV1 gene products support wild-type AAV replication and recombinant AAV (rAAV) production in human embryonic kidney (HEK) 293 cells. More importantly, the HBoV1 capsid is able to pseudopackage an rAAV2 or rHBoV1 genome, producing the rAAV2/HBoV1 or rHBoV1 vector. The HBoV1 capsid based rAAV vector has a high tropism for human airway epithelia. A deeper understanding in HBoV1 replication and gene expression will help find a better way to produce the rAAV vector and to increase the efficacy of gene delivery using the rAAV2/HBoV1 or rHBoV1 vector, in particular, to human airways. This review summarizes the recent advances in gene expression and replication of HBoV1, as well as the use of HBoV1 as a parvoviral vector for gene delivery.
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Affiliation(s)
- Liting Shao
- Beijing Institute of Radiation Medicine, Beijing, China
| | - Weiran Shen
- Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, KS, United States
| | - Shengqi Wang
- Beijing Institute of Radiation Medicine, Beijing, China
| | - Jianming Qiu
- Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, KS, United States
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3
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Altan E, Delaney MA, Colegrove KM, Spraker TR, Wheeler EA, Deng X, Li Y, Gulland FMD, Delwart E. Complex Virome in a Mesenteric Lymph Node from a Californian Sea Lion ( Zalophus Californianus) with Polyserositis and Steatitis. Viruses 2020; 12:v12080793. [PMID: 32718049 PMCID: PMC7472147 DOI: 10.3390/v12080793] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 07/15/2020] [Accepted: 07/17/2020] [Indexed: 12/20/2022] Open
Abstract
An emaciated subadult free-ranging California sea lion (Csl or Zalophus californianus) died following stranding with lesions similar to 11 other stranded animals characterized by chronic disseminated granulomatous inflammation with necrotizing steatitis and vasculitis, involving visceral adipose tissues in the thoracic and peritoneal cavities. Histologically, affected tissues had extensive accumulations of macrophages with perivascular lymphocytes, plasma cells, and fewer neutrophils. Using viral metagenomics on a mesenteric lymph node six mammalian viruses were identified consisting of novel parvovirus, polyomavirus, rotavirus, anellovirus, and previously described Csl adenovirus 1 and Csl bocavirus 4. The causal or contributory role of these viruses to the gross and histologic lesions of this sea lion remains to be determined.
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Affiliation(s)
- Eda Altan
- Vitalant Research Institute, 270 Masonic Ave, San Francisco, CA 94118, USA; (E.A.); (X.D.); (Y.L.)
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA 94118, USA
| | - Martha A. Delaney
- Zoological Pathology Program, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, 3300 Golf Road, Brookfield, IL 60513, USA; (M.A.D.); (K.M.C.)
| | - Kathleen M. Colegrove
- Zoological Pathology Program, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, 3300 Golf Road, Brookfield, IL 60513, USA; (M.A.D.); (K.M.C.)
| | - Terry R. Spraker
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, 300 West Drake Road, Fort Collins, CO 80526, USA;
| | - Elizabeth A. Wheeler
- Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Bustad 471, Pullman, WA 99164, USA;
| | - Xutao Deng
- Vitalant Research Institute, 270 Masonic Ave, San Francisco, CA 94118, USA; (E.A.); (X.D.); (Y.L.)
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA 94118, USA
| | - Yanpeng Li
- Vitalant Research Institute, 270 Masonic Ave, San Francisco, CA 94118, USA; (E.A.); (X.D.); (Y.L.)
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA 94118, USA
| | - Frances M. D. Gulland
- Karen C. Drayer Wildlife Heath Center, School of Veterinary Medicine, University of California at Davis, One Shields Avenue, Davis, CA 95616, USA;
| | - Eric Delwart
- Vitalant Research Institute, 270 Masonic Ave, San Francisco, CA 94118, USA; (E.A.); (X.D.); (Y.L.)
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA 94118, USA
- Correspondence:
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Nigg JC, Falk BW. Diaphorina citri densovirus is a persistently infecting virus with a hybrid genome organization and unique transcription strategy. J Gen Virol 2019; 101:226-239. [PMID: 31855134 DOI: 10.1099/jgv.0.001371] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Diaphorina citri densovirus (DcDV) is an ambisense densovirus with a 5071 nt genome. Phylogenetic analysis places DcDV in an intermediate position between those in the Ambidensovirus and Iteradensovirus genera, a finding that is consistent with the observation that DcDV possesses an Iteradensoviris-like non-structural (NS) protein-gene cassette, but a capsid-protein (VP) gene cassette resembling those of other ambisense densoviruses. DcDV is maternally transmitted to 100 % of the progeny of infected female Diaphorina citri, and the progeny of infected females carry DcDV as a persistent infection without outward phenotypic effects. We were unable to infect naïve individuals by oral inoculation, however low levels of transient viral replication are detected following intrathoracic injection of DcDV virions into uninfected D. citri insects. Transcript mapping indicates that DcDV produces one transcript each from the NS and VP gene cassettes and that these transcripts are polyadenylated at internal sites to produce a ~2.2 kb transcript encoding the NS proteins and a ~2.4 kb transcript encoding the VP proteins. Additionally, we found that transcriptional readthrough leads to the production of longer non-canonical transcripts from both genomic strands.
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Affiliation(s)
- Jared C Nigg
- Department of Plant Pathology, University of California, Davis, CA, USA
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Herz M, Brehm K. Evidence for densovirus integrations into tapeworm genomes. Parasit Vectors 2019; 12:560. [PMID: 31771643 PMCID: PMC6880638 DOI: 10.1186/s13071-019-3820-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 11/20/2019] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Tapeworms lack a canonical piRNA-pathway, raising the question of how they can silence existing mobile genetic elements (MGE). Investigation towards the underlying mechanisms requires information on tapeworm transposons which is, however, presently scarce. METHODS The presence of densovirus-related sequences in tapeworm genomes was studied by bioinformatic approaches. Available RNA-Seq datasets were mapped against the Echinococcus multilocularis genome to calculate expression levels of densovirus-related genes. Transcription of densovirus loci was further analyzed by sequencing and RT-qPCR. RESULTS We herein provide evidence for the presence of densovirus-related elements in a variety of tapeworm genomes. In the high-quality genome of E. multilocularis we identified more than 20 individual densovirus integration loci which contain the information for non-structural and structural virus proteins. The majority of densovirus loci are present as head-to-tail concatemers in isolated repeat containing regions of the genome. In some cases, unique densovirus loci have integrated close to histone gene clusters. We show that some of the densovirus loci of E. multilocularis are actively transcribed, whereas the majority are transcriptionally silent. RT-qPCR data further indicate that densovirus expression mainly occurs in the E. multilocularis stem cell population, which probably forms the germline of this organism. Sequences similar to the non-structural densovirus genes present in E. multilocularis were also identified in the genomes of E. canadensis, E. granulosus, Hydatigera taeniaeformis, Hymenolepis diminuta, Hymenolepis microstoma, Hymenolepis nana, Taenia asiatica, Taenia multiceps, Taenia saginata and Taenia solium. CONCLUSIONS Our data indicate that densovirus integration has occurred in many tapeworm species. This is the first report on widespread integration of DNA viruses into cestode genomes. Since only few densovirus integration sites were transcriptionally active in E. multilocularis, our data are relevant for future studies into gene silencing mechanisms in tapeworms. Furthermore, they indicate that densovirus-based vectors might be suitable tools for genetic manipulation of cestodes.
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Affiliation(s)
- Michaela Herz
- Institut für Hygiene und Mikrobiologie, Universität Würzburg, Josef-Schneider-Str 2/E1, 97080 Würzburg, Germany
| | - Klaus Brehm
- Institut für Hygiene und Mikrobiologie, Universität Würzburg, Josef-Schneider-Str 2/E1, 97080 Würzburg, Germany
- Konsiliarlabor für Echinokokkose des Robert-Koch-Instituts, Josef-Schneider-Straße 2/E1, 97080 Würzburg, Germany
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Rizk F, Laverdure S, d’Alençon E, Bossin H, Dupressoir T. Linear Lepidopteran ambidensovirus 1 sequences drive random integration of a reporter gene in transfected Spodoptera frugiperda cells. PeerJ 2018; 6:e4860. [PMID: 29868273 PMCID: PMC5978394 DOI: 10.7717/peerj.4860] [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: 02/12/2018] [Accepted: 05/04/2018] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND The Lepidopteran ambidensovirus 1 isolated from Junonia coenia (hereafter JcDV) is an invertebrate parvovirus considered as a viral transduction vector as well as a potential tool for the biological control of insect pests. Previous works showed that JcDV-based circular plasmids experimentally integrate into insect cells genomic DNA. METHODS In order to approach the natural conditions of infection and possible integration, we generated linear JcDV-gfp based molecules which were transfected into non permissive Spodoptera frugiperda (Sf9) cultured cells. Cells were monitored for the expression of green fluorescent protein (GFP) and DNA was analyzed for integration of transduced viral sequences. Non-structural protein modulation of the VP-gene cassette promoter activity was additionally assayed. RESULTS We show that linear JcDV-derived molecules are capable of long term genomic integration and sustained transgene expression in Sf9 cells. As expected, only the deletion of both inverted terminal repeats (ITR) or the polyadenylation signals of NS and VP genes dramatically impairs the global transduction/expression efficiency. However, all the integrated viral sequences we characterized appear "scrambled" whatever the viral content of the transfected vector. Despite a strong GFP expression, we were unable to recover any full sequence of the original constructs and found rearranged viral and non-viral sequences as well. Cellular flanking sequences were identified as non-coding ones. On the other hand, the kinetics of GFP expression over time led us to investigate the apparent down-regulation by non-structural proteins of the VP-gene cassette promoter. CONCLUSION Altogether, our results show that JcDV-derived sequences included in linear DNA molecules are able to drive efficiently the integration and expression of a foreign gene into the genome of insect cells, whatever their composition, provided that at least one ITR is present. However, the transfected sequences were extensively rearranged with cellular DNA during or after random integration in the host cell genome. Lastly, the non-structural proteins seem to participate in the regulation of p9 promoter activity rather than to the integration of viral sequences.
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Affiliation(s)
- Francine Rizk
- EPHE, PSL Research University, UMR 1333 DGIMI, Université de Montpellier, Montpellier, France
- UMR 1333 DGIMI INRA/UM, Université de Montpellier, Montpellier, France
- Department of Life and Earth Sciences, Faculty of Sciences, Branch II, Innovative Therapeutic Laboratory, Lebanese University, Beirut, Lebanon
| | - Sylvain Laverdure
- EPHE, PSL Research University, UMR 1333 DGIMI, Université de Montpellier, Montpellier, France
- UMR 1333 DGIMI INRA/UM, Université de Montpellier, Montpellier, France
- Laboratory of Human Retrovirology and Immunoinformatics (LHRI), Leidos Biomedical Research Clinical Services Program, National Cancer Institute, Frederick, MD, USA
| | | | - Hervé Bossin
- UMR 1333 DGIMI INRA/UM, Université de Montpellier, Montpellier, France
- Laboratoire d’Entomologie Médicale, Institut Louis Malardé, Papeete, French Polynesia
- Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, IHU-Méditerranée Infection, Marseille, France
| | - Thierry Dupressoir
- EPHE, PSL Research University, UMR 1333 DGIMI, Université de Montpellier, Montpellier, France
- UMR 1333 DGIMI INRA/UM, Université de Montpellier, Montpellier, France
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7
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Tijssen P, Pénzes JJ, Yu Q, Pham HT, Bergoin M. Reprint of: Diversity of small, single-stranded DNA viruses of invertebrates and their chaotic evolutionary past. J Invertebr Pathol 2017; 147:23-36. [PMID: 32781498 DOI: 10.1016/j.jip.2017.06.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 09/14/2016] [Accepted: 09/19/2016] [Indexed: 11/25/2022]
Abstract
A wide spectrum of invertebrates is susceptible to various single-stranded DNA viruses. Their relative simplicity of replication and dependence on actively dividing cells makes them highly pathogenic for many invertebrates (Hexapoda, Decapoda, etc.). We present their taxonomical classification and describe the evolutionary relationships between various groups of invertebrate-infecting viruses, their high degree of recombination, and their relationship to viruses infecting mammals or other vertebrates. They share characteristics of the viruses within the various families, including structure of the virus particle, genome properties, and gene expression strategy.
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Affiliation(s)
- Peter Tijssen
- Laboratoire de Virologie (Bldg 18), Institut National de Recherche Scientifique-Institut Armand-Frappier, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada
| | - Judit J Pénzes
- Laboratoire de Virologie (Bldg 18), Institut National de Recherche Scientifique-Institut Armand-Frappier, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada
| | - Qian Yu
- Laboratoire de Virologie (Bldg 18), Institut National de Recherche Scientifique-Institut Armand-Frappier, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada
| | - Hanh T Pham
- Laboratoire de Virologie (Bldg 18), Institut National de Recherche Scientifique-Institut Armand-Frappier, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada
| | - Max Bergoin
- Laboratoire de Virologie (Bldg 18), Institut National de Recherche Scientifique-Institut Armand-Frappier, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada; Laboratoire de Pathologie Comparée, Faculté des Sciences, Université Montpellier, Place Eugène Bataillon, 34095 Montpellier, France
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8
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Kotin RM, Snyder RO. Manufacturing Clinical Grade Recombinant Adeno-Associated Virus Using Invertebrate Cell Lines. Hum Gene Ther 2017; 28:350-360. [DOI: 10.1089/hum.2017.042] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Robert M. Kotin
- Gene Therapy Center, University of Massachusetts Medical School, Worcester, Massachusetts
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9
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Tijssen P, Pénzes JJ, Yu Q, Pham HT, Bergoin M. Diversity of small, single-stranded DNA viruses of invertebrates and their chaotic evolutionary past. J Invertebr Pathol 2016; 140:83-96. [PMID: 27663091 DOI: 10.1016/j.jip.2016.09.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 09/14/2016] [Accepted: 09/19/2016] [Indexed: 11/19/2022]
Abstract
A wide spectrum of invertebrates is susceptible to various single-stranded DNA viruses. Their relative simplicity of replication and dependence on actively dividing cells makes them highly pathogenic for many invertebrates (Hexapoda, Decapoda, etc.). We present their taxonomical classification and describe the evolutionary relationships between various groups of invertebrate-infecting viruses, their high degree of recombination, and their relationship to viruses infecting mammals or other vertebrates. They share characteristics of the viruses within the various families, including structure of the virus particle, genome properties, and gene expression strategy.
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Affiliation(s)
- Peter Tijssen
- Laboratoire de Virologie (Bldg 18), Institut National de Recherche Scientifique-Institut Armand-Frappier, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada
| | - Judit J Pénzes
- Laboratoire de Virologie (Bldg 18), Institut National de Recherche Scientifique-Institut Armand-Frappier, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada
| | - Qian Yu
- Laboratoire de Virologie (Bldg 18), Institut National de Recherche Scientifique-Institut Armand-Frappier, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada
| | - Hanh T Pham
- Laboratoire de Virologie (Bldg 18), Institut National de Recherche Scientifique-Institut Armand-Frappier, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada
| | - Max Bergoin
- Laboratoire de Virologie (Bldg 18), Institut National de Recherche Scientifique-Institut Armand-Frappier, 531 Boul. des Prairies, Laval, QC, H7V 1B7, Canada; Laboratoire de Pathologie Comparée, Faculté des Sciences, Université Montpellier, Place Eugène Bataillon, 34095 Montpellier, France
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10
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Clavijo G, van Munster M, Monsion B, Bochet N, Brault V. Transcription of densovirus endogenous sequences in the Myzus persicae genome. J Gen Virol 2016; 97:1000-1009. [PMID: 26758080 DOI: 10.1099/jgv.0.000396] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Integration of non-retroviral sequences in the genome of different organisms has been observed and, in some cases, a relationship of these integrations with immunity has been established. The genome of the green peach aphid, Myzus persicae (clone G006), was screened for densovirus-like sequence (DLS) integrations. A total of 21 DLSs localized on 10 scaffolds were retrieved that mostly shared sequence identity with two aphid-infecting viruses, Myzus persicae densovirus (MpDNV) and Dysaphis plantaginea densovirus (DplDNV). In some cases, uninterrupted potential ORFs corresponding to non-structural viral proteins or capsid proteins were found within DLSs identified in the aphid genome. In particular, one scaffold harboured a complete virus-like genome, while another scaffold contained two virus-like genomes in reverse orientation. Remarkably, transcription of some of these ORFs was observed in M. persicae, suggesting a biological effect of these viral integrations. In contrast to most of the other densoviruses identified so far that induce acute host infection, it has been reported previously that MpDNV has only a minor effect on M. persicae fitness, while DplDNV can even have a beneficial effect on its aphid host. This suggests that DLS integration in the M. persicae genome may be responsible for the latency of MpDNV infection in the aphid host.
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Affiliation(s)
- Gabriel Clavijo
- UMR 1131 SVQV INRA-UDS, 28 rue de Herrlisheim, 68021 Colmar, France
| | - Manuella van Munster
- UMR 385 BGPI, INRA-CIRAD-SupAgro, CIRAD TA-A54/K, CampusInternational de Baillarguet, 34398 Montpellier, France
| | - Baptiste Monsion
- UMR 1131 SVQV INRA-UDS, 28 rue de Herrlisheim, 68021 Colmar, France
| | - Nicole Bochet
- UMR 1131 SVQV INRA-UDS, 28 rue de Herrlisheim, 68021 Colmar, France
| | - Véronique Brault
- UMR 1131 SVQV INRA-UDS, 28 rue de Herrlisheim, 68021 Colmar, France
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11
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Insect cell transformation vectors that support high level expression and promoter assessment in insect cell culture. Plasmid 2016; 83:12-9. [DOI: 10.1016/j.plasmid.2016.01.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 01/09/2016] [Accepted: 01/11/2016] [Indexed: 11/24/2022]
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12
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Salasc F, Mutuel D, Debaisieux S, Perrin A, Dupressoir T, Grenet ASG, Ogliastro M. Role of the phosphatidylinositol-3-kinase/Akt/target of rapamycin pathway during ambidensovirus infection of insect cells. J Gen Virol 2015; 97:233-245. [PMID: 26508507 DOI: 10.1099/jgv.0.000327] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The phosphatidylinositol-3-kinase (PI3K)/Akt/target of rapamycin (TOR) signalling pathway controls cell growth and survival, and is targeted by a number of viruses at different phases of their infection cycle to control translation. Whether and how insect viruses interact with this pathway remain poorly addressed. Here, we investigated the role of PI3K/Akt/TOR signalling during lethal infection of insect cells with an insect parvovirus. Using Junonia coenia densovirus (JcDV; lepidopteran ambidensovirus 1) and susceptible insect cells as experimental models, we first described JcDV cytopathology, and showed that viral infection affects cell size, cell proliferation and survival. We deciphered the role of PI3K/Akt/TOR signalling in the course of infection and found that non-structural (NS) protein expression correlates with the inhibition of TOR and the shutdown of cellular synthesis, concomitant with the burst of viral protein expression. Together, these results suggest that NS proteins control the cellular translational machinery to favour the translation of viral mRNAs at the expense of cellular mRNAs. As a consequence of TOR inhibition, cell autophagy is activated. These results highlight new functions for NS proteins in the course of multiplication of an insect parvovirus.
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Affiliation(s)
- F Salasc
- EPHE, Pathologie Comparée des Invertébrés, UMR 1333, 34000 Montpellier, France.,INRA, UMR 1333, 34000 Montpellier, France
| | - D Mutuel
- INRA, UMR 1333, 34000 Montpellier, France
| | | | - A Perrin
- INRA, UMR 1333, 34000 Montpellier, France.,Invivo Agrosolutions, 06560 Valbonne, France
| | - T Dupressoir
- EPHE, Pathologie Comparée des Invertébrés, UMR 1333, 34000 Montpellier, France.,INRA, UMR 1333, 34000 Montpellier, France
| | - A-S Gosselin Grenet
- INRA, UMR 1333, 34000 Montpellier, France.,Université de Montpellier, UMR 1333, 34000 Montpellier, France
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Han Y, Wang Q, Qiu Y, Wu W, He H, Zhang J, Hu Y, Zhou X. Periplaneta fuliginosa densovirus nonstructural protein NS1 contains an endonuclease activity that is regulated by its phosphorylation. Virology 2013; 437:1-11. [PMID: 23290078 DOI: 10.1016/j.virol.2012.12.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Revised: 10/26/2012] [Accepted: 12/10/2012] [Indexed: 01/26/2023]
Abstract
Periplaneta fuliginosa densovirus (PfDNV) is a single-stranded DNA virus, belonging to Densovirinae subfamily, Parvoviridae family. Parvovirus nonstructural protein 1 (NS1) contains various activities required for parvoviral DNA replication, like endonuclease, helicase and ATPase, which are regulated by serine/threonine phosphorylation. However, for PfDNV, NS1 endonuclease activity has not been determined. Moreover, for densoviruses, whether NS1 is phosphorylated, and if so, phosphorylation pattern and impact on NS1 activities have not been investigated. Here, we demonstrated that PfDNV NS1 possesses endonuclease activity, covalently attaches to 5'-end of nicking site, and includes an active-site tyrosine (Y178). Moreover, using different phosphatases, we uncovered that both serine/threonine and tyrosine phosphorylations are critical for NS1 endonuclease and helicase activities. Further mass-spec and mutational analyses revealed that Y345 is phosphorylated and functions as a critical regulatory site for NS1 activities. This study should foster our understanding of NS1 activities and regulations in PfDNV and other densoviruses.
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Affiliation(s)
- Yajuan Han
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, Hubei 430072, China
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Kivovich V, Gilbert L, Vuento M, Naides SJ. The putative metal coordination motif in the endonuclease domain of human Parvovirus B19 NS1 is critical for NS1 induced S phase arrest and DNA damage. Int J Biol Sci 2011; 8:79-92. [PMID: 22211107 PMCID: PMC3248650 DOI: 10.7150/ijbs.8.79] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Accepted: 11/02/2011] [Indexed: 12/14/2022] Open
Abstract
The non-structural proteins (NS) of the parvovirus family are highly conserved multi-functional molecules that have been extensively characterized and shown to be integral to viral replication. Along with NTP-dependent helicase activity, these proteins carry within their sequences domains that allow them to bind DNA and act as nucleases in order to resolve the concatameric intermediates developed during viral replication. The parvovirus B19 NS1 protein contains sequence domains highly similar to those previously implicated in the above-described functions of NS proteins from adeno-associated virus (AAV), minute virus of mice (MVM) and other non-human parvoviruses. Previous studies have shown that transient transfection of B19 NS1 into human liver carcinoma (HepG2) cells initiates the intrinsic apoptotic cascade, ultimately resulting in cell death. In an effort to elucidate the mechanism of mammalian cell demise in the presence of B19 NS1, we undertook a mutagenesis analysis of the protein's endonuclease domain. Our studies have shown that, unlike wild-type NS1, which induces an accumulation of DNA damage, S phase arrest and apoptosis in HepG2 cells, disruptions in the metal coordination motif of the B19 NS1 protein reduce its ability to induce DNA damage and to trigger S phase arrest and subsequent apoptosis. These studies support our hypothesis that, in the absence of replicating B19 genomes, NS1-induced host cell DNA damage is responsible for apoptotic cell death observed in parvoviral infection of non-permissive mammalian cells.
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Affiliation(s)
- Violetta Kivovich
- Pennsylvania State College of Medicine/ Milton S. Hershey Medical Center, Hershey, PA, USA
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15
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Kapelinskaya TV, Martynova EU, Schal C, Mukha DV. Expression strategy of densonucleosis virus from the German cockroach, Blattella germanica. J Virol 2011; 85:11855-70. [PMID: 21900160 PMCID: PMC3209303 DOI: 10.1128/jvi.05523-11] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2011] [Accepted: 09/08/2011] [Indexed: 11/20/2022] Open
Abstract
Blattella germanica densovirus (BgDNV) is an autonomous parvovirus that infects the German cockroach. BgDNV possesses three mRNAs for NS proteins, two of which are splice variants of the unspliced transcript. The unspliced variant encodes open reading frame 5 (ORF5) (NS3), while NSspl1 encodes ORF3 (NS1) and ORF4 (NS2) and NSspl2 encodes the C-proximal half of NS1. BgDNV possesses three VP transcripts, one of which (VP) is unspliced, while the other two (VPspl1 and VPspl2) are generated by alternative splicing. The unspliced VP transcript contains both ORF1 and ORF2, while in VPspl1, ORF1 and ORF2 are joined in frame. The transcription of NS genes begins at an earlier stage of the virus life cycle than the transcription of VP genes. NS and VP transcripts overlap by 48 nucleotides (nt). BgDNV is characterized by two additional NS transcripts overlapping by more than 1,650 nt with VP-coding transcripts. Four different bands (97, 85, 80, and 57 kDa) corresponding to three BgDNV capsid proteins were detected on SDS-PAGE. Mass spectrometry analysis showed that the amino acid composition of the 85-kDa and 80-kDa proteins is the same. Moreover, both of these proteins are ubiquitinated. The BgDNV PLA(2) domain, which is critical for cellular uptake of the virus, is located in ORF2 and is present only in VP1. In contrast to all of the parvoviruses studied in this respect, VP2 has a unique N terminus that is not contained within VP1 and VP3. In situ recognition with NS1- and VP-specific antibodies revealed an uneven pattern of NS1 expression resembling a halo within the nuclear membrane.
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Affiliation(s)
- Tatiana V. Kapelinskaya
- Vavilov Institute of General Genetics, Russian Academy of Sciences, Gubkin 3, Moscow 119991, Russia
| | - Elena U. Martynova
- Vavilov Institute of General Genetics, Russian Academy of Sciences, Gubkin 3, Moscow 119991, Russia
| | - Coby Schal
- Department of Entomology and W. M. Keck Center for Behavioral Biology, Box 7613, North Carolina State University, Raleigh, North Carolina 27695-7613
| | - Dmitry V. Mukha
- Vavilov Institute of General Genetics, Russian Academy of Sciences, Gubkin 3, Moscow 119991, Russia
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16
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Swietnicki W, Carmany D, Retford M, Guelta M, Dorsey R, Bozue J, Lee MS, Olson MA. Identification of small-molecule inhibitors of Yersinia pestis Type III secretion system YscN ATPase. PLoS One 2011; 6:e19716. [PMID: 21611119 PMCID: PMC3097197 DOI: 10.1371/journal.pone.0019716] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2010] [Accepted: 04/14/2011] [Indexed: 01/12/2023] Open
Abstract
Yersinia pestis is a Gram negative zoonotic pathogen responsible for causing bubonic and pneumonic plague in humans. The pathogen uses a type III secretion system (T3SS) to deliver virulence factors directly from bacterium into host mammalian cells. The system contains a single ATPase, YscN, necessary for delivery of virulence factors. In this work, we show that deletion of the catalytic domain of the yscN gene in Y. pestis CO92 attenuated the strain over three million-fold in the Swiss-Webster mouse model of bubonic plague. The result validates the YscN protein as a therapeutic target for plague. The catalytic domain of the YscN protein was made using recombinant methods and its ATPase activity was characterized in vitro. To identify candidate therapeutics, we tested computationally selected small molecules for inhibition of YscN ATPase activity. The best inhibitors had measured IC50 values below 20 µM in an in vitro ATPase assay and were also found to inhibit the homologous BsaS protein from Burkholderia mallei animal-like T3SS at similar concentrations. Moreover, the compounds fully inhibited YopE secretion by attenuated Y. pestis in a bacterial cell culture and mammalian cells at µM concentrations. The data demonstrate the feasibility of targeting and inhibiting a critical protein transport ATPase of a bacterial virulence system. It is likely the same strategy could be applied to many other common human pathogens using type III secretion system, including enteropathogenic E. coli, Shigella flexneri, Salmonella typhimurium, and Burkholderia mallei/pseudomallei species.
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Affiliation(s)
- Wieslaw Swietnicki
- The Uniformed Services University, Bethesda, Maryland, United States of America.
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17
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Simmons R, Sharp C, Sims S, Kloverpris H, Goulder P, Simmonds P, Bowness P, Klenerman P. High frequency, sustained T cell responses to PARV4 suggest viral persistence in vivo. J Infect Dis 2011; 203:1378-87. [PMID: 21502079 PMCID: PMC3080894 DOI: 10.1093/infdis/jir036] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Accepted: 12/22/2010] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Parvovirus 4 (PARV4) is a recently identified human virus that has been found in livers of patients infected with hepatitis C virus (HCV) and in bone marrow of individuals infected with human immunodeficiency virus (HIV). T cells are important in controlling viruses but may also contribute to disease pathogenesis. The interaction of PARV4 with the cellular immune system has not been described. Consequently, we investigated whether T cell responses to PARV4 could be detected in individuals exposed to blood-borne viruses. METHODS Interferon γ (IFN-γ) enzyme-linked immunospot assay, intracellular cytokine staining, and a tetrameric HLA-A*0201-peptide complex were used to define the lymphocyte populations responding to PARV4 NS peptides in 88 HCV-positive and 13 HIV-positive individuals. Antibody responses were tested using a recently developed PARV4 enzyme-linked immunosorbent assay. RESULTS High-frequency T cell responses against multiple PARV4 NS peptides and antibodies were observed in 26% of individuals. Typical responses to the NS pools were >1000 spot-forming units per million peripheral blood mononuclear cells. CONCLUSIONS PARV4 infection is common in individuals exposed to blood-borne viruses and elicits strong T cell responses, a feature typically associated with persistent, contained infections such as cytomegalovirus. Persistence of PARV4 viral antigen in tissue in HCV-positive and HIV-positive individuals and/or the associated activated antiviral T cell response may contribute to disease pathogenesis.
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Affiliation(s)
| | - Colin Sharp
- University of Edinburgh, Centre for Infectious Diseases, United Kingdom
| | - Stuart Sims
- University of Edinburgh, Centre for Infectious Diseases, United Kingdom
| | - Henrik Kloverpris
- Department of Pediatrics, University of Oxford, Peter Medawar Building for Pathogen Research, United Kingdom
| | - Philip Goulder
- Department of Pediatrics, University of Oxford, Peter Medawar Building for Pathogen Research, United Kingdom
| | - Peter Simmonds
- University of Edinburgh, Centre for Infectious Diseases, United Kingdom
| | - Paul Bowness
- Weatherall Institute of Molecular Medicine
- National Institute for Health Research Biomedical Research Centre, John Radcliffe Hospital, Oxford, United Kingdom
| | - Paul Klenerman
- Nuffield Department of Medicine
- National Institute for Health Research Biomedical Research Centre, John Radcliffe Hospital, Oxford, United Kingdom
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18
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The nuclear localization signal of the NS1 protein is essential for Periplaneta fuliginosa densovirus infection. Virus Res 2009; 145:134-40. [PMID: 19596391 DOI: 10.1016/j.virusres.2009.07.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2009] [Revised: 07/02/2009] [Accepted: 07/02/2009] [Indexed: 11/21/2022]
Abstract
The regulatory protein NS1 is a key molecule in life cycle of Periplaneta fuliginosa densovirus (PfDNV). When we ectopically expressed the PfDNV NS1 protein in non-P. fuliginosa insect cells, the NS1 protein could not enter the nucleus and remained in the cytosol. However, the NS1 was localized to both the cytosol and nucleus of cockroach hemocyte cells. So we investigated the abilities of the potential nuclear localization signal (NLS) of P. fuliginosa Densovirus non-structural protein 1 (NS1) to translocate NS1 and a carrier protein to the nucleus following transfection into insect cells. Possible nuclear localization sequences were chosen from the NS1 on the basis of the presence of basic residues, which is a common theme in most of the previously identified targeting peptides. Nuclear localization activity was found within the residues 252-257 (RRRRRR) of the NS1, while replacement of a single arginine in this region with glycine abolished it. The targeting activity was enhanced with the arginine residues added.
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19
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Structure and expression strategy of the genome of Culex pipiens densovirus, a mosquito densovirus with an ambisense organization. J Virol 2009; 83:6863-73. [PMID: 19386710 DOI: 10.1128/jvi.00524-09] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The genome of all densoviruses (DNVs) so far isolated from mosquitoes or mosquito cell lines consists of a 4-kb single-stranded DNA molecule with a monosense organization (genus Brevidensovirus, subfamily Densovirinae). We previously reported the isolation of a Culex pipiens DNV (CpDNV) that differs significantly from brevidensoviruses by (i) having a approximately 6-kb genome, (ii) lacking sequence homology, and (iii) lacking antigenic cross-reactivity with Brevidensovirus capsid polypeptides. We report here the sequence organization and transcription map of this virus. The cloned genome of CpDNV is 5,759 nucleotides (nt) long, and it possesses an inverted terminal repeat (ITR) of 285 nt and an ambisense organization of its genes. The nonstructural (NS) proteins NS-1, NS-2, and NS-3 are located in the 5' half of one strand and are organized into five open reading frames (ORFs) due to the split of both NS-1 and NS-2 into two ORFs. The ORF encoding capsid polypeptides is located in the 5' half of the complementary strand. The expression of NS proteins is controlled by two promoters, P7 and P17, driving the transcription of a 2.4-kb mRNA encoding NS-3 and of a 1.8-kb mRNA encoding NS-1 and NS-2, respectively. The two NS mRNAs species are spliced off a 53-nt sequence. Capsid proteins are translated from an unspliced 2.3-kb mRNA driven by the P88 promoter. CpDNV thus appears as a new type of mosquito DNV, and based on the overall organization and expression modalities of its genome, it may represent the prototype of a new genus of DNV.
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20
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Densovirus infectious pathway requires clathrin-mediated endocytosis followed by trafficking to the nucleus. J Virol 2009; 83:4678-89. [PMID: 19225003 DOI: 10.1128/jvi.02401-08] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Junonia coenia densovirus (JcDNV) is an ambisense insect parvovirus highly pathogenic for lepidopteran pests at larval stages. The potential use of DNVs as biological control agents prompted us to reinvestigate the host range and cellular mechanisms of infection. In order to understand the early events of infection, we set up a functional infection assay in a cell line of the pest Lymantria dispar to determine the intracellular pathway undertaken by JcDNV to infect a permissive lepidopteran cell line. Our results show that JcDNV particles are rapidly internalized into clathrin-coated vesicles and slowly traffic within early and late endocytic compartments. Blocking late-endocytic trafficking or neutralizing the pH with drugs inhibited infection. During internalization, disruption of the cytoskeleton, and inhibition of phosphatidylinositol 3-kinase blocked the movement of vesicles containing the virus to the nucleus and impaired infection. In summary, our results define for the first time the early endocytic steps required for a productive DNV infection.
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21
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Shirk PD, Bossin H, Furlong RB, Gillett JL. Regulation of Junonia coenia densovirus P9 promoter expression. INSECT MOLECULAR BIOLOGY 2007; 16:623-33. [PMID: 17714462 DOI: 10.1111/j.1365-2583.2007.00759.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Transcriptional activity of the Junonia coenia densovirus (JcDNV) P9 promoter depends on a 557-bp sequence located within the overlapping 3' sequences for viral capsid and nonstructural genes. Utilizing a somatic transformation assay to assess JcDNV promoter activity in Drosophila melanogaster and Plodia interpunctella, viral sequences were subjected to deletional analysis. Removal of a 685-bp fragment reduced P9-driven expression to background levels. Inclusion of a second expression cassette demonstrated vector persistence and confirmed somatic transformation. P9 promoter-driven expression was restored by insertion of a 557-bp JcDNV fragment or by inclusion of a heterologous baculovirus hr5 enhancer. Consensus polycomb transcriptional factor binding sites were identified within the 557-bp fragment, which suggests a potential role in regulating densoviral transcription.
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Affiliation(s)
- P D Shirk
- USDA ARS CMAVE, Gainesville, FL 32608, USA.
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22
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Fryer JF, Delwart E, Bernardin F, Tuke PW, Lukashov VV, Baylis SA. Analysis of two human parvovirus PARV4 genotypes identified in human plasma for fractionation. J Gen Virol 2007; 88:2162-2167. [PMID: 17622618 DOI: 10.1099/vir.0.82620-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The presence of the novel parvovirus PARV4 and a related variant, PARV5, was recently demonstrated in pooled plasma used in the manufacture of blood and plasma-derived medicinal products. DNA sequence analysis of nearly full-length genomes of four PARV4 and two PARV5 strains from manufacturing plasma pools is now presented. Like PARV4, PARV5 encodes two non-overlapping open reading frames (ORF1 and ORF2), homologous to the non-structural and capsid proteins of other parvoviruses, respectively. A highly conserved region in ORF2 contains phospholipase A2 motifs involved in parvovirus infectivity. Hybridization of strand-specific probes to DNA extracted from high-titre, PARV4-positive plasma revealed that the positive and negative strands are packaged into PARV4 virions in similar quantities. This extended analysis of nearly full-length PARV4 and PARV5 sequences suggests that they are closely related genotypes and the use of a single virus name, PARV4, comprising genotypes 1 and 2 (previously termed PARV5) is proposed.
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Affiliation(s)
- Jacqueline F Fryer
- Division of Virology, National Institute for Biological Standards and Control, Blanche Lane, South Mimms, Potters Bar, Hertfordshire, EN6 3QG, UK
| | - Eric Delwart
- University of California, San Francisco, CA 94118, USA
- Blood Systems Research Institute, San Francisco, CA 94118, USA
| | - Flavien Bernardin
- University of California, San Francisco, CA 94118, USA
- Blood Systems Research Institute, San Francisco, CA 94118, USA
| | - Philip W Tuke
- Department of Virology, University College London Hospital, The Windeyer Building, 46 Cleveland Street, London W1T 4JF, UK
| | - Vladimir V Lukashov
- Laboratory of Immunochemistry, D. I. Ivanovsky Institute of Virology, 123098 Moscow, Russia
- Laboratory of Experimental Virology, Department of Medical Microbiology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam, 1105AZ Amsterdam, The Netherlands
| | - Sally A Baylis
- Division of Virology, National Institute for Biological Standards and Control, Blanche Lane, South Mimms, Potters Bar, Hertfordshire, EN6 3QG, UK
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23
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Ekman A, Hokynar K, Kakkola L, Kantola K, Hedman L, Bondén H, Gessner M, Aberham C, Norja P, Miettinen S, Hedman K, Söderlund-Venermo M. Biological and immunological relations among human parvovirus B19 genotypes 1 to 3. J Virol 2007; 81:6927-35. [PMID: 17409158 PMCID: PMC1933287 DOI: 10.1128/jvi.02713-06] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The human parvovirus B19 is now divided into three genotypes: type 1 (prototype), type 2 (A6- and LaLi-like), and type 3 (V9-like). In overall DNA sequence, the three virus types differ by approximately 10%. The most striking DNA dissimilarity, of >20%, is observed within the p6 promoter region. Because of the scarcity of data on the biological activities and pathogenetic potentials of virus types 2 and 3, we examined the functional characteristics of these virus types. We found the activities of the three p6 promoters to be of equal strength and to be most active in B19-permissive cells. Virus type 2 capsid protein VP2, alone or together with VP1, was expressed with the baculovirus system and was shown to assemble into icosahedral parvovirus-like particles, which were reactive in the hemagglutination assay. Furthermore, sera containing DNA of any of the three B19 types were shown to hemagglutinate. The infectivities of these sera were examined in two B19-permissive cell lines. Reverse transcription-PCR revealed synthesis of spliced B19 mRNAs, and immunofluorescence verified the production of NS and VP proteins in the infected cells. All three genotypes showed similar functional characteristics in all experiments performed, showing that the three virus types indeed belong to the same species, i.e., human parvovirus B19. Additionally, the antibody activity in sera from B19 type 1- or type 2-infected subjects (long-term immunity) was examined with homo- and heterologous virus-like particles. Cross-reactivity of 100% was observed, indicating that the two B19 genotypes comprise a single serotype.
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Affiliation(s)
- Anna Ekman
- Department of Virology, Haartman Institute, University of Helsinki, Helsinki, Finland
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24
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Wang J, Zhang J, Jiang H, Liu C, Yi F, Hu Y. Nucleotide sequence and genomic organization of a newly isolated densovirus infecting Dendrolimus punctatus. J Gen Virol 2005; 86:2169-2173. [PMID: 16033964 DOI: 10.1099/vir.0.80898-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The nucleotide sequence of a novel icosahedral DNA virus infecting Dendrolimus punctatus has been determined. The genome is 5039 nt long and includes inverted terminal repeats of 200 nt containing 131 nt long J-shaped terminal hairpins. The ‘plus' strand of the genome contains three large open reading frames (ORFs), the left and the mid-ORFs (within the left ORF) in the left-half encoding the non-structural proteins and the right ORF in the right-half encoding viral capsid proteins. NS1 protein contains conserved replication initiation and DNA-dependent ATPase/helicase domains. VP1 protein contains a conserved PGY and phospholipase A2 motifs and shows high identities with VPs of Casphalia extranea densovirus and Bombyx mori densovirus-1 belonging to the genus Iteravirus. Phylogenetic analysis also revealed that this virus is most closely related to Casphalia extranea densovirus and Bombyx mori densovirus-1. Consequently, this virus was considered as a new third member of the genus Iteravirus of the subfamily Densovirinae, and designated Dendrolimus punctatus densovirus.
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Affiliation(s)
- Junping Wang
- Laboratory of Insect Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Jiamin Zhang
- Laboratory of Insect Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Hong Jiang
- Laboratory of Insect Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Chuanfeng Liu
- Laboratory of Insect Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Fuming Yi
- Laboratory of Insect Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Yuanyang Hu
- Laboratory of Insect Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China
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25
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El-Far M, Li Y, Fédière G, Abol-Ela S, Tijssen P. Lack of infection of vertebrate cells by the densovirus from the maize worm Mythimna loreyi (MlDNV). Virus Res 2004; 99:17-24. [PMID: 14687942 DOI: 10.1016/j.virusres.2003.09.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Several densoviruses have been used successfully in biological control of pests in the tropics. The densovirus from Mythimna loreyi (MlDNV) could also be an important tool in biological control of important pests. However, safety concerns remain as previous reports suggested that densoviruses may infect and transform L cells (from mouse). In this study, we show using molecular-biology tools that neither L nor other vertebrate cells support replication or transcription of densovirus, either after infection or after transfection. Quantitative PCR indicated no increase of viral DNA due to replication in vertebrate cells, in contrast to that in insect LD652 cells. After transfection, both the NS and VP mRNAs could be detected in LD652 cells but not in L cells. Moreover, the viral genome was excised from the plasmid after transfection of the infectious clone in LD652 cells, indicative of viral NS protein production, in contrast to L cells. The viral genome was able to integrate in the host chromosome of L cells after transfection, but not after infection. However, no viral transcription could be detected after integration.
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Affiliation(s)
- M El-Far
- INRS-Institut Armand-Frappier, Université du Québec, 531 Boul. des Prairies, Laval, Qué., Canada H7V 1B7
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26
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Abd-Alla A, Jousset FX, Li Y, Fédière G, Cousserans F, Bergoin M. NS-3 protein of the Junonia coenia densovirus is essential for viral DNA replication in an Ld 652 cell line and Spodoptera littoralis larvae. J Virol 2004; 78:790-7. [PMID: 14694111 PMCID: PMC368811 DOI: 10.1128/jvi.78.2.790-797.2004] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2003] [Accepted: 09/29/2003] [Indexed: 11/20/2022] Open
Abstract
The genome of Junonia coenia densovirus (JcDNV) shares with members of the genus Densovirus the property of possessing structural (VP) and nonstructural (NS) genes in opposite orientations. The three NS genes located in the 5' half on one strand encode three NS proteins assumed to be involved in viral DNA replication: NS-1 and NS-2, which are common to all DNVs, and a 28-kDa polypeptide, NS-3, with a unique sequence. Whereas the essential role played by JcDNV NS-1 in viral DNA replication has been clearly established (C. Ding, M. Urabe, M. Bergoin, and R. M. Kotin, J. Virol. 76:338-345, 2002), nothing is known of the biological function(s) of NS-3. To investigate this function, we designed constructs derived from pBRJ, a plasmid encompassing an infectious sequence of JcDNV DNA (M. Jourdan, F. X. Jousset, M. Gervais, S. Skory, M. Bergoin, and B. Dumas, Virology 179:403-409, 1990), with partial or complete deletion of NS-3 sequence or with the ATG initiation codon mutated by site-directed mutagenesis. Transfection of these constructs to sensitive Ld 652 cells or Spodoptera littoralis larvae prevented the accomplishment of a productive cycle. We clearly established that the blocking of the replicative cycle in the absence of NS-3 expression occurred at the level of viral DNA replication. Replication of viral DNA could be restored by cotransfecting Ld 652 cells with a plasmid expressing JcDNV-NS-3 protein in trans. Time course analysis showed that NS-3 is produced early (6 h posttransfection) in the replicative cycle, and its production parallels that of replicative-form viral DNA. Finally, we present evidence that NS-1 and NS-2 proteins are synthesized at apparently the same levels whether or not NS-3 is expressed.
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Affiliation(s)
- Adly Abd-Alla
- Unité de Virologie Moléculaire, Station de Recherches de Pathologie Comparée, 30380 Saint Christol-lez-Alès, and Laboratoire de Pathologie Comparée, Université Montpellier II, France
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27
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Bossin H, Fournier P, Royer C, Barry P, Cérutti P, Gimenez S, Couble P, Bergoin M. Junonia coenia densovirus-based vectors for stable transgene expression in Sf9 cells: influence of the densovirus sequences on genomic integration. J Virol 2003; 77:11060-71. [PMID: 14512554 PMCID: PMC224968 DOI: 10.1128/jvi.77.20.11060-11071.2003] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The invertebrate parvovirus Junonia coenia densovirus (JcDNV) shares similarities with terminal hairpins and nonstructural (NS) protein activities of adeno-associated virus (AAV) despite their evolutionary divergence (B. Dumas, M. Jourdan, A. M. Pascaud, and M. Bergoin, Virology, 191:202-222, 1992, and C. Ding, M. Urabe, M. Bergoin, and R. M. Kotin, J. Virol. 76:338-345, 2002). We demonstrate here that persistent transgene expression in insect cells results from stable integration of transfected JcDNV-derived vectors into the host genome. To assess the integrative properties of JcDNV vectors, the green fluorescent protein (GFP) gfp marker gene was fused in frame into the major open reading frame (ORF1) of the viral sequence under the control of the P9 capsid protein promoter. In addition, the influence of the nonstructural proteins on the posttransfection maintenance of the vectors was examined by interruption of one or all three NS ORFs. Following transfection of Sf9 cells with each of the JcDNV constructs, clones showing persistent GFP expression were isolated. Structural analyses revealed that the majority of the JcDNV plasmid sequence was integrated into the genome of the fluorescent clones. Integration was observed whether or not NS proteins were expressed. However, the presence of NS genes in the constructs greatly influenced the number of integrated copies and their distribution in the host genome. Disruption of NS genes expression resulted in integration of head-to-tail concatemers at multiple sites within the genome. Further analyses demonstrated that the cis JcDNV 5' inverted terminal repeat region was the primary site of recombination. Sequence analyses of integration junctions showed rearrangements of both flanking and internal sequences for most integrations. These findings demonstrate that JcDNV vectors integrate into insect cells in a manner similar to AAV plasmids in mammalian cells.
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Affiliation(s)
- Hervé Bossin
- Unité de Virologie Moléculaire, UMR5087, INRA-CNRS-UMII, Station de Recherches de Pathologie Comparée, 30380 Saint-Christol-les-Alès, and Laboratoire de Pathologie Comparée, Université Montpellier II, France
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van Munster M, Dullemans AM, Verbeek M, van den Heuvel JFJM, Reinbold C, Brault V, Clérivet A, van der Wilk F. A new virus infecting Myzus persicae has a genome organization similar to the species of the genus Densovirus. J Gen Virol 2003; 84:165-172. [PMID: 12533713 DOI: 10.1099/vir.0.18650-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The genomic sequence of a new icosahedral DNA virus infecting Myzus persicae has been determined. Analysis of 5499 nt of the viral genome revealed five open reading frames (ORFs) evenly distributed in the 5' half of both DNA strands. Three ORFs (ORF1-3) share the same strand, while two other ORFs (ORF4 and ORF5) are detected in the complementary sequence. The overall genomic organization is similar to that of species from the genus DENSOVIRUS: ORFs 1-3 most likely encode the non-structural proteins, since their putative products contain conserved replication motifs, NTP-binding domains and helicase domains similar to those found in the NS-1 protein of parvoviruses. The deduced amino acid sequences from ORFs 4 and 5 show sequence similarities with the structural proteins of the members of the genus DENSOVIRUS: These data indicate that this virus is a new species of the genus Densovirus in the family PARVOVIRIDAE: The virus was tentatively named Myzus persicae densovirus.
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Affiliation(s)
- M van Munster
- Plant Research International, PO Box 16, 6700 AA Wageningen, The Netherlands
| | - A M Dullemans
- Plant Research International, PO Box 16, 6700 AA Wageningen, The Netherlands
| | - M Verbeek
- Plant Research International, PO Box 16, 6700 AA Wageningen, The Netherlands
| | | | - C Reinbold
- INRA, 28 rue de Herrlisheim, 68021 Colmar Cédex, France
| | - V Brault
- INRA, 28 rue de Herrlisheim, 68021 Colmar Cédex, France
| | - A Clérivet
- Unité de Phytopathologie, IRD, BP 5045 Montpellier, France
| | - F van der Wilk
- Plant Research International, PO Box 16, 6700 AA Wageningen, The Netherlands
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