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RNA virus

  • Reconstitution of an RNA Virus Replicase in Artificial Giant Unilamellar Vesicles Supports Full Replication and Provides Protection for the Double-Stranded RNA Replication Intermediate
    Genome Replication and Regulation of Viral Gene Expression
    Reconstitution of an RNA Virus Replicase in Artificial Giant Unilamellar Vesicles Supports Full Replication and Provides Protection for the Double-Stranded RNA Replication Intermediate

    Understanding the mechanism of replication of positive-strand RNA viruses, which are major pathogens of plants, animals, and humans, can lead to new targets for antiviral interventions. These viruses subvert intracellular membranes for virus replication and coopt numerous host proteins, whose functions during virus replication are not yet completely defined. To dissect the roles of various host factors in Tomato bushy stunt virus...

    Nikolay Kovalev, Judit Pogany, Peter D. Nagy
  • High-Throughput Fluorescence-Based Screen Identifies the Neuronal MicroRNA miR-124 as a Positive Regulator of Alphavirus Infection
    Virus-Cell Interactions
    High-Throughput Fluorescence-Based Screen Identifies the Neuronal MicroRNA miR-124 as a Positive Regulator of Alphavirus Infection

    Arthropod-borne (arbo) viruses are part of a class of pathogens that are transmitted to their final hosts by insects. Because of climate change, the habitat of some of these insects, such as mosquitoes, is shifting, thereby facilitating the emergence of viral epidemics. Among the pathologies associated with arbovirus infection, neurological diseases such as meningitis and encephalitis represent a significant health burden. Using a...

    Paula López, Erika Girardi, Bryan C. Mounce, Amélie Weiss, Béatrice Chane-Woon-Ming, Mélanie Messmer, Pasi Kaukinen, Arnaud Kopp, Diane Bortolamiol-Becet, Ali Fendri, Marco Vignuzzi, Laurent Brino, Sébastien Pfeffer
  • Unravelling the Stability and Capsid Dynamics of the Three Virions of Brome Mosaic Virus Assembled Autonomously <em>In Vivo</em>
    Structure and Assembly
    Unravelling the Stability and Capsid Dynamics of the Three Virions of Brome Mosaic Virus Assembled Autonomously In Vivo

    The majority of viruses contain RNA genomes protected by a shell of capsid proteins. Although crystallographic studies show that viral capsids are static structures, accumulating evidence suggests that, in solution, virions are highly dynamic assemblies. The three genomic RNAs (RNA1, -2, and -3) and a single subgenomic RNA (RNA4) of Brome mosaic virus (BMV), an RNA virus pathogenic to plants, are distributed among three physically...

    Antara Chakravarty, Vijay S. Reddy, A. L. N. Rao
  • Thioredoxin 2 Negatively Regulates Innate Immunity to RNA Viruses by Disrupting the Assembly of the Virus-Induced Signaling Adaptor Complex
    Pathogenesis and Immunity
    Thioredoxin 2 Negatively Regulates Innate Immunity to RNA Viruses by Disrupting the Assembly of the Virus-Induced Signaling Adaptor Complex

    The VISA-associated complex plays pivotal roles in inducing type I interferons (IFNs) and eliciting the innate antiviral response. Many host proteins are identified as VISA-associated-complex proteins, but how VISA complex formation is regulated by host proteins remains enigmatic. We identified the TRX2 protein as an important regulator of VISA complex formation. Knockout of TRX2 increases virus- or poly(I·C)-triggered induction of type...

    Dan Li, Wenping Yang, Yi Ru, Jingjing Ren, Xiangtao Liu, Haixue Zheng
  • Fitness Barriers Limit Reversion of a Proofreading-Deficient Coronavirus
    Genetic Diversity and Evolution
    Fitness Barriers Limit Reversion of a Proofreading-Deficient Coronavirus

    Coronaviruses encode an exoribonuclease (ExoN) that is important for viral replication, fitness, and virulence, yet coronaviruses with a defective ExoN (ExoN-AA) have not reverted under diverse experimental conditions. In this study, we identify multiple impediments to MHV-ExoN-AA reversion. We show that ExoN-AA reversion is possible but evolutionarily unfavorable. Instead, compensatory mutations outside ExoN-AA motif I are more...

    Kevin W. Graepel, Maria L. Agostini, Xiaotao Lu, Nicole R. Sexton, Mark R. Denison
  • Open Access
    Comparative Analysis of Gene Expression in Virulent and Attenuated Strains of Infectious Bronchitis Virus at Subcodon Resolution
    Genome Replication and Regulation of Viral Gene Expression
    Comparative Analysis of Gene Expression in Virulent and Attenuated Strains of Infectious Bronchitis Virus at Subcodon Resolution

    IBV is a major avian pathogen and presents a substantial economic burden to the poultry industry. Improved vaccination strategies are urgently needed to curb the global spread of this virus, and the development of suitable vaccine candidates will be aided by an improved understanding of IBV molecular biology. Our high-resolution data have enabled a precise study of transcription and translation in cells infected with both pathogenic and...

    Adam M. Dinan, Sarah Keep, Erica Bickerton, Paul Britton, Andrew E. Firth, Ian Brierley
  • Immune-Mediated Control of a Dormant Neurotropic RNA Virus Infection
    Pathogenesis and Immunity | Spotlight
    Immune-Mediated Control of a Dormant Neurotropic RNA Virus Infection

    Viral infections of neurons are often not cytopathic; thus, once-infected neurons survive, and viral RNAs can be detected long after apparent viral control. These RNAs are generally considered viral fossils, unlikely to contribute to central nervous system (CNS) disease. Using a mouse model of measles virus (MV) neuronal infection, we show that MV RNA is maintained in the CNS of infected mice long after acute control and in the absence...

    Katelyn D. Miller, Christine M. Matullo, Katelynn A. Milora, Riley M. Williams, Kevin J. O’Regan, Glenn F. Rall
  • Chandipura Virus Utilizes the Prosurvival Function of RelA NF-κB for Its Propagation
    Cellular Response to Infection
    Chandipura Virus Utilizes the Prosurvival Function of RelA NF-κB for Its Propagation

    RelA/NF-κB participates in a wide spectrum of physiological processes, including shaping immune responses against invading pathogens. In virus-infected cells, RelA typically induces the expression of IFN-β, which restrains viral propagation in neighboring cells involving paracrine mechanisms. Our study suggested that RelA might also play a proviral role. A cell-autonomous RelA activity amplified the yield of Chandipura virus, a...

    Sachendra S. Bais, Yashika Ratra, Naseem A. Khan, Rakesh Pandey, Pramod K. Kushawaha, Shailly Tomar, Guruprasad Medigeshi, Abhyudai Singh, Soumen Basak
  • Identification and Characterization of a Human Coronavirus 229E Nonstructural Protein 8-Associated RNA 3′-Terminal Adenylyltransferase Activity
    Genome Replication and Regulation of Viral Gene Expression | Spotlight
    Identification and Characterization of a Human Coronavirus 229E Nonstructural Protein 8-Associated RNA 3′-Terminal Adenylyltransferase Activity

    Previously, coronavirus nsp8 proteins were suggested to have template-dependent RNA polymerase activities resembling those of RNA primases or even canonical RNA-dependent RNA polymerases, while more recent studies have suggested an essential cofactor function of nsp8 (plus nsp7) for nsp12-mediated RNA-dependent RNA polymerase activity. In an effort to reconcile conflicting data from earlier studies, the study revisits coronavirus nsp8-...

    Jana Tvarogová, Ramakanth Madhugiri, Ganesh Bylapudi, Lyndsey J. Ferguson, Nadja Karl, John Ziebuhr
  • Genome Characterization, Prevalence, and Transmission Mode of a Novel Picornavirus Associated with the Threespine Stickleback Fish (<span class="named-content genus-species" id="named-content-1">Gasterosteus aculeatus</span>)
    Structure and Assembly
    Genome Characterization, Prevalence, and Transmission Mode of a Novel Picornavirus Associated with the Threespine Stickleback Fish (Gasterosteus aculeatus)

    The threespine stickleback species complex is an important model system in ecological and evolutionary studies because of the large number of isolated divergent populations that are experimentally tractable. For similar reasons, its coevolution with the cestode parasite Schistocephalus solidus, its interaction with gut microbes, and the evolution of its immune system...

    Megan A. Hahn, Nolwenn M. Dheilly

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