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envelope glycoprotein

  • Differential Pressures of SERINC5 and IFITM3 on HIV-1 Envelope Glycoprotein over the Course of HIV-1 Infection
    Virus-Cell Interactions
    Differential Pressures of SERINC5 and IFITM3 on HIV-1 Envelope Glycoprotein over the Course of HIV-1 Infection

    HIV-1 Env protein is exposed to the inhibition not only by humoral response, but also by host restriction factors, including serine incorporator 5 (SERINC5) and interferon-inducible transmembrane 3 (IFITM3). This study investigates how HIV-1 envelope glycoprotein (Env) manages to overcome the pressures from all these different host inhibition mechanisms over the long course of viral infection. HIV-1 Env preserves the resistance to...

    Saina Beitari, Qinghua Pan, Andrés Finzi, Chen Liang
  • Biological Characterization of Conserved Residues within the Cytoplasmic Tail of the Pichinde Arenaviral Glycoprotein Subunit 2 (GP2)
    Structure and Assembly
    Biological Characterization of Conserved Residues within the Cytoplasmic Tail of the Pichinde Arenaviral Glycoprotein Subunit 2 (GP2)

    Several arenaviruses, such as Lassa virus (LASV), can cause severe and lethal hemorrhagic fever diseases with high mortality and morbidity, for which no FDA-approved vaccines or therapeutics are available. Viral entry is mediated by the arenavirus GP complex, which consists of the stable signal peptide (SSP), the receptor-binding subunit GP1, and the transmembrane subunit GP2. The cytoplasmic tail (CT) of GP2 is highly conserved among...

    Junjie Shao, Qinfeng Huang, Xiaoying Liu, Da Di, Mythili Dileepan, Morgan Brisse, Hinh Ly, Yuying Liang
  • The Polar Region of the HIV-1 Envelope Protein Determines Viral Fusion and Infectivity by Stabilizing the gp120-gp41 Association
    Virus-Cell Interactions
    The Polar Region of the HIV-1 Envelope Protein Determines Viral Fusion and Infectivity by Stabilizing the gp120-gp41 Association

    Although extensive studies of the transmembrane unit (gp41) of HIV-1 Env have led to a fusion inhibitor clinically used to block viral entry, the functions of different domains of gp41 in HIV-1 fusion and infectivity are not fully elucidated. The polar region (PR) of gp41 has been proposed to participate in HIV-1 membrane fusion in biochemical analyses, but its role in viral entry and infectivity remain unclear. In our effort to...

    Wuxun Lu, Shuliang Chen, Jingyou Yu, Ryan Behrens, Joshua Wiggins, Nathan Sherer, Shan-Lu Liu, Yong Xiong, Shi-Hua Xiang, Li Wu
  • Open Access
    Positive Selection at Key Residues in the HIV Envelope Distinguishes Broad and Strain-Specific Plasma Neutralizing Antibodies
    Pathogenesis and Immunity
    Positive Selection at Key Residues in the HIV Envelope Distinguishes Broad and Strain-Specific Plasma Neutralizing Antibodies

    Millions of people are still being infected with HIV decades after the first recognition of the virus. Currently, no vaccine is able to elicit bNAbs that will prevent infection by global HIV strains. Several studies have implicated HIV Env diversity in the development of breadth. However, Env evolution in individuals who fail to develop breadth despite mounting potent strain-specific neutralizing responses has not been well defined....

    Batsirai M. Mabvakure, Cathrine Scheepers, Nigel Garrett, Salim Abdool Karim, Carolyn Williamson, Lynn Morris, Penny L. Moore
  • A Coreceptor-Mimetic Peptide Enhances the Potency of V3-Glycan Antibodies
    Vaccines and Antiviral Agents
    A Coreceptor-Mimetic Peptide Enhances the Potency of V3-Glycan Antibodies

    HIV-1 requires both the cellular receptor CD4 and a tyrosine-sulfated coreceptor to infect its target cells. CD4-Ig is a fusion of the HIV-1-binding domains of CD4 with an antibody Fc domain. Previous studies have demonstrated that the potency of CD4-Ig is markedly increased by appending a coreceptor-mimetic sulfopeptide to its C terminus. We investigated whether this coreceptor-mimetic peptide improves the potency of broadly...

    Ina Fetzer, Meredith E. Davis-Gardner, Matthew R. Gardner, Barnett Alfant, Jesse A. Weber, Neha R. Prasad, Amber S. Zhou, Michael Farzan
  • Conformational Differences between Functional Human Immunodeficiency Virus Envelope Glycoprotein Trimers and Stabilized Soluble Trimers
    Structure and Assembly
    Conformational Differences between Functional Human Immunodeficiency Virus Envelope Glycoprotein Trimers and Stabilized Soluble Trimers

    HIV-1 envelope glycoprotein spikes mediate the entry of the virus into host cells and are a major target for vaccine-induced antibodies. Soluble forms of the envelope glycoproteins that are stable and easily produced have been characterized extensively and are being considered as vaccines. Here, we present evidence that these stabilized soluble envelope glycoproteins differ in multiple respects from the natural HIV-1 envelope...

    Luis R. Castillo-Menendez, Hanh T. Nguyen, Joseph Sodroski
  • Open Access
    Virus-Cell Interactions
    HIV-1 gp41 Residues Modulate CD4-Induced Conformational Changes in the Envelope Glycoprotein and Evolution of a Relaxed Conformation of gp120

    Binding of the HIV envelope glycoprotein (Env) to cellular CD4 and chemokine receptors triggers conformational changes in Env that mediate virus entry, but premature triggering of Env conformational changes leads to virus inactivation. Currently, we have a limited understanding of the network of residues that regulate Env conformational changes. Here, we identify residues in HR1 of gp41 that modulate conformational changes in response...

    Paul W. Keller, Orrianne Morrison, Russell Vassell, Carol D. Weiss
  • Structure and Assembly
    Comparison of Uncleaved and Mature Human Immunodeficiency Virus Membrane Envelope Glycoprotein Trimers
    Luis R. Castillo-Menendez, Kristen Witt, Nicole Espy, Amy Princiotto, Navid Madani, Beatriz Pacheco, Andrés Finzi, Joseph Sodroski
  • Virus-Cell Interactions
    HIV-1 R5 Macrophage-Tropic Envelope Glycoprotein Trimers Bind CD4 with High Affinity, while the CD4 Binding Site on Non-macrophage-tropic, T-Tropic R5 Envelopes Is Occluded
    Briana Quitadamo, Paul J. Peters, Alexander Repik, Olivia O'Connell, Zhongming Mou, Matthew Koch, Mohan Somasundaran, Robin Brody, Katherine Luzuriaga, Aaron Wallace, Shixia Wang, Shan Lu, Sean McCauley, Jeremy Luban, Maria Duenas-Decamp, Maria Paz Gonzalez-Perez, Paul R. Clapham
  • Vaccines and Antiviral Agents
    Epistastic Interactions within the Junín Virus Envelope Glycoprotein Complex Provide an Evolutionary Barrier to Reversion in the Live-Attenuated Candid#1 Vaccine
    Joanne York, Jack H. Nunberg

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