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antiviral

  • Open Access
    Loss of the Nuclear Protein RTF2 Enhances Influenza Virus Replication
    Cellular Response to Infection | Spotlight
    Loss of the Nuclear Protein RTF2 Enhances Influenza Virus Replication

    Viral infection triggers the secretion of type I interferons, which in turn induce the expression of hundreds of antiviral genes. However, the roles of these induced genes in controlling viral infections remain largely unknown, limiting our ability to develop host-based antiviral therapeutics against pathogenic viruses, such as influenza virus. Here, we performed a loss-of-function genetic CRISPR screen in cells prestimulated with type...

    Bing Shao Chia, Bo Li, Ang Cui, Thomas Eisenhaure, Raktima Raychowdhury, David Lieb, Nir Hacohen
  • Open Access
    Antiviral Properties of the LSD1 Inhibitor SP-2509
    Genome Replication and Regulation of Viral Gene Expression
    Antiviral Properties of the LSD1 Inhibitor SP-2509

    Treatment of HSV-1-infected cells with SP-2509 blocked viral DNA replication, gene expression after the onset of DNA replication, and virus production. These data support a potential new role for LSD1 in the regulation of viral DNA replication and successive steps in the virus life cycle, and further highlight the promising potential to utilize LSD1 inhibition as an antiviral approach.

    Mitchell R. Harancher, Jessica E. Packard, Shane P. Cowan, Neal A. DeLuca, Jill A. Dembowski
  • Identification and Characterization of a Small-Molecule Rabies Virus Entry Inhibitor
    Vaccines and Antiviral Agents | Spotlight
    Identification and Characterization of a Small-Molecule Rabies Virus Entry Inhibitor

    Rabies PEP depends on anti-RABV IgG, which is expensive and in limited supply in geographical areas with the highest disease burden. Replacing the IgG component with a cost-effective and shelf-stable small-molecule antiviral could address this unmet clinical need by expanding access to life-saving medication. This study has established a robust protocol for high-throughput anti-RABV drug screens and identified a chemically well-behaved...

    Venice Du Pont, Christoph Wirblich, Jeong-Joong Yoon, Robert M. Cox, Matthias J. Schnell, Richard K. Plemper
  • Bacterial Pigment Prodigiosin Demonstrates a Unique Antiherpesvirus Activity That Is Mediated through Inhibition of Prosurvival Signal Transducers
    Vaccines and Antiviral Agents
    Bacterial Pigment Prodigiosin Demonstrates a Unique Antiherpesvirus Activity That Is Mediated through Inhibition of Prosurvival Signal Transducers

    In this article, we provide a new role for a commonly found bacterial pigment in controlling herpes simplex virus infection, for which diverse and multimodal antiviral agents are needed to prevent drug resistance. Serratia marcescens is a red pigment (prodigiosin)-producing Gram-negative bacillus that is naturally found in soil and water. It is associated with many...

    Rahul K. Suryawanshi, Lulia Koujah, Chandrashekhar D. Patil, Joshua M. Ames, Alex Agelidis, Tejabhiram Yadavalli, Satish V. Patil, Deepak Shukla
  • Dominant Negative MA-CA Fusion Protein Is Incorporated into HIV-1 Cores and Inhibits Nuclear Entry of Viral Preintegration Complexes
    Structure and Assembly
    Dominant Negative MA-CA Fusion Protein Is Incorporated into HIV-1 Cores and Inhibits Nuclear Entry of Viral Preintegration Complexes

    To become infectious, newly formed HIV-1 particles undergo a process of maturation in which the viral polyproteins are cleaved into smaller components. A previous study demonstrated that inclusion of even small quantities of an uncleavable mutant Gag polyprotein results in a strong reduction in virus infectivity. Here we show that the mechanism of transdominant inhibition by uncleavable Gag involves inhibition of nuclear entry and...

    Jordan Anderson-Daniels, Parmit K. Singh, Gregory A. Sowd, Wen Li, Alan N. Engelman, Christopher Aiken
  • The Interferon-Inducible Proteoglycan Testican-2/SPOCK2 Functions as a Protective Barrier against Virus Infection of Lung Epithelial Cells
    Virus-Cell Interactions
    The Interferon-Inducible Proteoglycan Testican-2/SPOCK2 Functions as a Protective Barrier against Virus Infection of Lung Epithelial Cells

    Here we report a novel proteoglycan protein, testican-2/SPOCK2, that prevents influenza virus infection. Testican-2/SPOCK2 is a complex type of secreted proteoglycan with heparan sulfate GAG chains attached to the core protein. SPOCK2 expression is induced upon virus infection or by interferons, and the protein is secreted to an extracellular compartment, where it acts directly to block virus-cell attachment and entry. Treatment with...

    Narae Ahn, Woo-Jong Kim, Nari Kim, Han Wook Park, Seung-Woo Lee, Joo-Yeon Yoo
  • Trapping the Enemy: <em>Vermamoeba vermiformis</em> Circumvents Faustovirus Mariensis Dissemination by Enclosing Viral Progeny inside Cysts
    Virus-Cell Interactions
    Trapping the Enemy: Vermamoeba vermiformis Circumvents Faustovirus Mariensis Dissemination by Enclosing Viral Progeny inside Cysts

    Understanding how viruses of microbes interact with its hosts is not only important from a basic scientific point of view but also for a better comprehension of the evolution of life. Studies involving large and giant viruses have revealed original and outstanding mechanisms concerning virus-host relationships. Here, we report a mechanism developed by Vermamoeba vermiformis, a free-living amoeba, to reduce Faustovirus mariensis...

    Iara Borges, Rodrigo Araújo Lima Rodrigues, Fábio Pio Dornas, Gabriel Almeida, Isabella Aquino, Cláudio Antônio Bonjardim, Erna Geessien Kroon, Bernard La Scola, Jônatas Santos Abrahão
  • Open Access
    RIG-I Activation by a Designer Short RNA Ligand Protects Human Immune Cells against Dengue Virus Infection without Causing Cytotoxicity
    Vaccines and Antiviral Agents
    RIG-I Activation by a Designer Short RNA Ligand Protects Human Immune Cells against Dengue Virus Infection without Causing Cytotoxicity

    Short hairpin RNA ligands that activate RIG-I induce antiviral responses in infected cells and prevent or control viral infections. Here, we characterized a new short hairpin RNA molecule with high efficacy in antiviral gene activation and showed that this molecule is able to control dengue virus infection. We demonstrate how structural modifications of minimal RNA ligands can lead to increased potency and a wider window of RIG-I-...

    Victor Ho, Hui Yee Yong, Marion Chevrier, Vipin Narang, Josephine Lum, Ying-Xiu Toh, Bernett Lee, Jinmiao Chen, Ern Yu Tan, Dahai Luo, Katja Fink
  • Atovaquone Inhibits Arbovirus Replication through the Depletion of Intracellular Nucleotides
    Vaccines and Antiviral Agents | Spotlight
    Atovaquone Inhibits Arbovirus Replication through the Depletion of Intracellular Nucleotides

    The ability to protect vulnerable populations such as pregnant women and children from Zika virus and other arbovirus infections is essential to preventing the devastating complications induced by these viruses. One class of antiviral therapies may lie in known pregnancy-acceptable drugs that have the potential to mitigate arbovirus infections and disease, yet this has not been explored in detail. In this study, we show that the common...

    Angelica Cifuentes Kottkamp, Elfie De Jesus, Rebecca Grande, Julia A. Brown, Adam R. Jacobs, Jean K. Lim, Kenneth A. Stapleford
  • Early Human B Cell Response to Ebola Virus in Four U.S. Survivors of Infection
    Pathogenesis and Immunity
    Early Human B Cell Response to Ebola Virus in Four U.S. Survivors of Infection

    The pathogenesis of Ebola virus disease (EVD) in humans is complex, and the mechanisms contributing to immunity are poorly understood. In particular, it appears that the quality and magnitude of the human B cell response early after recovery from EVD may be reduced compared to most viral infections. Here, we isolated human monoclonal antibodies from B cells of four survivors of EVD at 1 or 3 months after hospital discharge. Ebola-...

    Lauren E. Williamson, Andrew I. Flyak, Nurgun Kose, Robin Bombardi, Andre Branchizio, Srikar Reddy, Edgar Davidson, Benjamin J. Doranz, Marnie L. Fusco, Erica O. Saphire, Peter J. Halfmann, Yoshihiro Kawaoka, Ashley E. Piper, Pamela J. Glass, James E. Crowe

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