1i5x Citations

Structural and functional analysis of interhelical interactions in the human immunodeficiency virus type 1 gp41 envelope glycoprotein by alanine-scanning mutagenesis.

J Virol 75 11146-56 (2001)

Abstract

Membrane fusion by human immunodeficiency virus type 1 (HIV-1) is promoted by the refolding of the viral envelope glycoprotein into a fusion-active conformation. The structure of the gp41 ectodomain core in its fusion-active state is a trimer of hairpins in which three antiparallel carboxyl-terminal helices pack into hydrophobic grooves on the surface of an amino-terminal trimeric coiled coil. In an effort to identify amino acid residues in these grooves that are critical for gp41 activation, we have used alanine-scanning mutagenesis to investigate the importance of individual side chains in determining the biophysical properties of the gp41 core and the membrane fusion activity of the gp120-gp41 complex. Alanine substitutions at Leu-556, Leu-565, Val-570, Gly-572, and Arg-579 positions severely impaired membrane fusion activity in envelope glycoproteins that were for the most part normally expressed. Whereas alanine mutations at Leu-565 and Val-570 destabilized the trimer-of-hairpins structure, mutations at Gly-572 and Arg-579 led to the formation of a stable gp41 core. Our results suggest that the Leu-565 and Val-570 residues are important determinants of conserved packing interactions between the amino- and carboxyl-terminal helices of gp41. We propose that the high degree of sequence conservation at Gly-572 and Arg-579 may result from selective pressures imposed by prefusogenic conformations of the HIV-1 envelope glycoprotein. Further analysis of the gp41 activation process may elucidate targets for antiviral intervention.

Reviews - 1i5x mentioned but not cited (2)

Articles - 1i5x mentioned but not cited (4)

  1. Structural and functional analysis of interhelical interactions in the human immunodeficiency virus type 1 gp41 envelope glycoprotein by alanine-scanning mutagenesis. Lu M, Stoller MO, Wang S, Liu J, Fagan MB, Nunberg JH. J Virol 75 11146-11156 (2001)
  2. Bhageerath: an energy based web enabled computer software suite for limiting the search space of tertiary structures of small globular proteins. Jayaram B, Bhushan K, Shenoy SR, Narang P, Bose S, Agrawal P, Sahu D, Pandey V. Nucleic Acids Res 34 6195-6204 (2006)
  3. Computer-Aided Approaches for Targeting HIVgp41. Allen WJ, Rizzo RC. Biology (Basel) 1 311-338 (2012)
  4. Crystal Structure of Refolding Fusion Core of Lassa Virus GP2 and Design of Lassa Virus Fusion Inhibitors. Zhang X, Wang C, Chen B, Wang Q, Xu W, Ye S, Jiang S, Zhu Y, Zhang R. Front Microbiol 10 1829 (2019)


Reviews citing this publication (5)

  1. The energetics of membrane fusion from binding, through hemifusion, pore formation, and pore enlargement. Cohen FS, Melikyan GB. J Membr Biol 199 1-14 (2004)
  2. Common principles and intermediates of viral protein-mediated fusion: the HIV-1 paradigm. Melikyan GB. Retrovirology 5 111 (2008)
  3. The complex antigenicity of a small external region of the C-terminal tail of the HIV-1 gp41 envelope protein: a lesson in epitope analysis. Dimmock NJ. Rev Med Virol 15 365-381 (2005)
  4. Deep Mutational Scanning of Viral Glycoproteins and Their Host Receptors. Narayanan KK, Procko E. Front Mol Biosci 8 636660 (2021)
  5. HIV Infection: Shaping the Complex, Dynamic, and Interconnected Network of the Cytoskeleton. Cabrera-Rodríguez R, Pérez-Yanes S, Lorenzo-Sánchez I, Trujillo-González R, Estévez-Herrera J, García-Luis J, Valenzuela-Fernández A. Int J Mol Sci 24 13104 (2023)

Articles citing this publication (45)

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  36. Conserved Residue Asn-145 in the C-Terminal Heptad Repeat Region of HIV-1 gp41 is Critical for Viral Fusion and Regulates the Antiviral Activity of Fusion Inhibitors. Geng X, Liu Z, Yu D, Qin B, Zhu Y, Cui S, Chong H, He Y. Viruses 11 E609 (2019)
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