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neutralization

  • Systematic Assessment of Antiviral Potency, Breadth, and Synergy of Triple Broadly Neutralizing Antibody Combinations against Simian-Human Immunodeficiency Viruses
    Vaccines and Antiviral Agents
    Systematic Assessment of Antiviral Potency, Breadth, and Synergy of Triple Broadly Neutralizing Antibody Combinations against Simian-Human Immunodeficiency Viruses

    Optimal bNAb immunotherapeutics will need to mediate multiple antiviral functions against a broad range of HIV strains. Our systematic assessment of triple bNAb combinations against SHIVs will identify bNAbs with synergistic, polyfunctional antiviral activity that will inform the selection of candidate bNAbs for optimal combination designs. The identified combinations can be validated in vivo in future passive immunization...

    Stella J. Berendam, Tiffany M. Styles, Papa K. Morgan-Asiedu, DeAnna Tenney, Amit Kumar, Veronica Obregon-Perko, Katharine J. Bar, Kevin O. Saunders, Sampa Santra, Kristina De Paris, Georgia D. Tomaras, Ann Chahroudi, Sallie R. Permar, Rama R. Amara, Genevieve G. Fouda
  • Comprehensive Assessment of the Antigenic Impact of Human Papillomavirus Lineage Variation on Recognition by Neutralizing Monoclonal Antibodies Raised against Lineage A Major Capsid Proteins of Vaccine-Related Genotypes
    Genetic Diversity and Evolution
    Comprehensive Assessment of the Antigenic Impact of Human Papillomavirus Lineage Variation on Recognition by Neutralizing Monoclonal Antibodies Raised against Lineage A Major Capsid Proteins of Vaccine-Related Genotypes

    Human papillomavirus (HPV) is the causative agent of cervical and some other epithelial cancers. HPV vaccines generate functional (neutralizing) antibodies that target the virus particles (or capsids) of the most common HPV cancer-causing genotypes. Each genotype comprises variant forms that have arisen over millennia and which include changes within the capsid proteins. In this study, we explored the potential for these naturally...

    Anna Godi, Dolcibella Boampong, Busayo Elegunde, Kavita Panwar, Maxime Fleury, Shaowei Li, Qinjian Zhao, Ningshao Xia, Neil D. Christensen, Simon Beddows
  • A Novel Approach To Display Structural Proteins of Hepatitis C Virus Quasispecies in Patients Reveals a Key Role of E2 HVR1 in Viral Evolution
    Genetic Diversity and Evolution
    A Novel Approach To Display Structural Proteins of Hepatitis C Virus Quasispecies in Patients Reveals a Key Role of E2 HVR1 in Viral Evolution

    A cell culture model that can recapitulate the diversity of HCV quasispecies in patients is important for analysis of neutralizing epitopes and HCV vaccine development. In this study, we developed a new reverse genetics system for HCV infection based on trans-complementation of viral structural proteins (HCVΔS). This system can be used to display structural proteins of HCV strains of multiple genotypes as well as clinical...

    Yimin Tong, Qingchao Li, Rui Li, Yongfen Xu, Yu Pan, Junqi Niu, Jin Zhong
  • Development of a 3Mut-Apex-Stabilized Envelope Trimer That Expands HIV-1 Neutralization Breadth When Used To Boost Fusion Peptide-Directed Vaccine-Elicited Responses
    Vaccines and Antiviral Agents
    Development of a 3Mut-Apex-Stabilized Envelope Trimer That Expands HIV-1 Neutralization Breadth When Used To Boost Fusion Peptide-Directed Vaccine-Elicited Responses

    A major hurdle to the development of an effective HIV-1 vaccine is the elicitation of serum responses capable of neutralizing circulating strains of HIV, which are extraordinarily diverse in sequence and often highly neutralization resistant. Recently, we showed how sera with 20 to 30% neutralization breadth could, nevertheless, be elicited in standard vaccine test animals by priming with the most prevalent N-terminal 8 residues of the...

    Gwo-Yu Chuang, Yen-Ting Lai, Jeffrey C. Boyington, Cheng Cheng, Hui Geng, Sandeep Narpala, Reda Rawi, Stephen D. Schmidt, Yaroslav Tsybovsky, Raffaello Verardi, Kai Xu, Yongping Yang, Baoshan Zhang, Michael Chambers, Anita Changela, Angela R. Corrigan, Rui Kong, Adam S. Olia, Li Ou, Edward K. Sarfo, Shuishu Wang, Winston Wu, Nicole A. Doria-Rose, Adrian B. McDermott, John R. Mascola, Peter D. Kwong
  • Nanobody-Mediated Neutralization Reveals an Achilles Heel for Norovirus
    Structure and Assembly
    Nanobody-Mediated Neutralization Reveals an Achilles Heel for Norovirus

    This research discovered and analyzed two different types of MNV-neutralizing nanobodies. The top-binding nanobodies sterically inhibited the receptor-binding site, whereas the dimeric-binding nanobodies interfered with a structural modification associated with cofactor binding. Moreover, we found that the capsid contained a number of vulnerable regions that were essential for viral replication. In fact, the capsid appeared to be...

    Anna D. Koromyslova, Jessica M. Devant, Turgay Kilic, Charles D. Sabin, Virginie Malak, Grant S. Hansman
  • Glycoprotein C of Herpes Simplex Virus 1 Shields Glycoprotein B from Antibody Neutralization
    Structure and Assembly
    Glycoprotein C of Herpes Simplex Virus 1 Shields Glycoprotein B from Antibody Neutralization

    HSV-1 causes lifelong infection in the human population and can be fatal in neonatal and immunocompromised individuals. There is no vaccine or cure, in part due to the ability of HSV to escape the host immune response by various mechanisms. The HSV particle contains at least 15 envelope proteins, four of which are required for entry and replication. This work suggests a novel role for gC in shielding the HSV entry glycoproteins. gC may...

    Tri Komala Sari, Katrina A. Gianopulos, Anthony V. Nicola
  • A New Family of Small-Molecule CD4-Mimetic Compounds Contacts Highly Conserved Aspartic Acid 368 of HIV-1 gp120 and Mediates Antibody-Dependent Cellular Cytotoxicity
    Pathogenesis and Immunity
    A New Family of Small-Molecule CD4-Mimetic Compounds Contacts Highly Conserved Aspartic Acid 368 of HIV-1 gp120 and Mediates Antibody-Dependent Cellular Cytotoxicity

    HIV-1 has evolved multiple strategies to avoid humoral responses. One efficient mechanism is to keep its envelope glycoprotein (Env) in its “closed” conformation. Here, we report on a new family of small molecules that are able to “open up” Env, thus exposing vulnerable epitopes. This new family of molecules binds in the Phe43 cavity and contacts the highly conserved D368 residue. The structural and biological attributes of molecules of...

    Shilei Ding, Melissa C. Grenier, William D. Tolbert, Dani Vézina, Rebekah Sherburn, Jonathan Richard, Jérémie Prévost, Jean-Philippe Chapleau, Gabrielle Gendron-Lepage, Halima Medjahed, Cameron Abrams, Joseph Sodroski, Marzena Pazgier, Amos B. Smith, Andrés Finzi
  • A Replication-Defective Human Cytomegalovirus Vaccine Elicits Humoral Immune Responses Analogous to Those with Natural Infection
    Vaccines and Antiviral Agents
    A Replication-Defective Human Cytomegalovirus Vaccine Elicits Humoral Immune Responses Analogous to Those with Natural Infection

    In utero HCMV infection can lead to miscarriage or childhood disabilities, and an effective vaccine is urgently needed. Since children born to women who are seropositive prior to pregnancy are less likely to be affected by congenital HCMV infection, it has been hypothesized that a vaccine capable of inducing an immune response resembling the responses in HCMV-seropositive women may be effective. We previously described a...

    Yaping Liu, Daniel C. Freed, Leike Li, Aimin Tang, Fengsheng Li, Edward M. Murray, Stuart P. Adler, Michael A. McVoy, Richard E. Rupp, Diane Barrett, Xiaohua Ye, Ningyan Zhang, Karen Beck, Timothy Culp, Rituparna Das, Liping Song, Kalpit Vora, Hua Zhu, Dai Wang, Amy S. Espeseth, Zhiqiang An, Luwy Musey, Tong-Ming Fu
  • CD4 Incorporation into HIV-1 Viral Particles Exposes Envelope Epitopes Recognized by CD4-Induced Antibodies
    Pathogenesis and Immunity
    CD4 Incorporation into HIV-1 Viral Particles Exposes Envelope Epitopes Recognized by CD4-Induced Antibodies

    It has been well established that Env-CD4 complexes expose epitopes recognized by commonly elicited CD4-induced antibodies at the surface of HIV-1-infected cells, rendering them vulnerable to ADCC responses. Here, we show that CD4 incorporation has a profound impact on Env conformation at the surface of viral particles. Incorporated CD4 exposes CD4-induced epitopes on Env, rendering HIV-1 susceptible to neutralization by otherwise...

    Shilei Ding, Romain Gasser, Gabrielle Gendron-Lepage, Halima Medjahed, William D. Tolbert, Joseph Sodroski, Marzena Pazgier, Andrés Finzi
  • Open Access
    Xenoantigen-Dependent Complement-Mediated Neutralization of Lymphocytic Choriomeningitis Virus Glycoprotein-Pseudotyped Vesicular Stomatitis Virus in Human Serum
    Vaccines and Antiviral Agents
    Xenoantigen-Dependent Complement-Mediated Neutralization of Lymphocytic Choriomeningitis Virus Glycoprotein-Pseudotyped Vesicular Stomatitis Virus in Human Serum

    Systemic application aims to deliver oncolytic viruses to tumors as well as to metastatic lesions. However, we found that xenoantigens incorporated onto the viral surface from nonhuman production cell lines are recognized by natural antibodies in human serum and that the virus is thereby inactivated by complement lysis. Hence, to maximize the effective dose, careful selection of cell lines for virus production is crucial.

    ...
    Lisa Pipperger, Iris Koske, Nicole Wild, Brigitte Müllauer, Daniela Krenn, Heribert Stoiber, Guido Wollmann, Janine Kimpel, Dorothee von Laer, Zoltán Bánki

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