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Molecular switch for alternative conformations of the HIV-1 V3 region: implications for phenotype conversion.

HIV-1 coreceptor usage plays a critical role in virus tropism and pathogenesis. A switch from CCRS- to CXCR4-using viruses occurs during the course of HIV-1 infection and correlates with subsequent disease progression. A single mutation at position 322 within the V3 loop of the HIV-1 envelope glycop... Full description

Journal Title: Proceedings of the National Academy of Sciences of the United States of America September 19, 2006, Vol.103(38), pp.13950-13955
Main Author: Rosen, Osnat
Other Authors: Sharon, Michal , Quadt-Akabayov, Sabine R , Anglister, Jacob
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0027-8424
Link: http://search.proquest.com/docview/68869810/?pq-origsite=primo
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recordid: proquest68869810
title: Molecular switch for alternative conformations of the HIV-1 V3 region: implications for phenotype conversion.
format: Article
creator:
  • Rosen, Osnat
  • Sharon, Michal
  • Quadt-Akabayov, Sabine R
  • Anglister, Jacob
subjects:
  • Amino Acid Sequence–Metabolism
  • Chemokines–Chemistry
  • Crystallography, X-Ray–Genetics
  • HIV Envelope Protein Gp120–Metabolism
  • HIV-1–Metabolism
  • Humans–Pathogenicity
  • Hydrogen Bonding–Chemistry
  • Models, Molecular–Genetics
  • Molecular Sequence Data–Metabolism
  • Nuclear Magnetic Resonance, Biomolecular–Metabolism
  • Peptide Fragments–Metabolism
  • Phenotype–Metabolism
  • Point Mutation–Metabolism
  • Protein Binding–Metabolism
  • Protein Conformation–Metabolism
  • Static Electricity–Metabolism
  • Chemokines
  • HIV Envelope Protein Gp120
  • HIV Envelope Protein Gp120 (305-321)
  • Peptide Fragments
ispartof: Proceedings of the National Academy of Sciences of the United States of America, September 19, 2006, Vol.103(38), pp.13950-13955
description: HIV-1 coreceptor usage plays a critical role in virus tropism and pathogenesis. A switch from CCRS- to CXCR4-using viruses occurs during the course of HIV-1 infection and correlates with subsequent disease progression. A single mutation at position 322 within the V3 loop of the HIV-1 envelope glycoprotein gp120, from a negatively to a positively charged residue, was found to be sufficient to switch an R5 virus to an X4 virus. In this study, the NMR structure of the V3 region of an R5 strain, HIV-[1.sub.JR-FL], in complex with an HIV-1-neutralizing antibody was determined. Positively charged and negatively charged residues at positions 304 and 322, respectively, oppose each other in the [beta]-hairpin structure, enabling a favorable electrostatic interaction that stabilizes the postulated R5 conformation. Comparison of the R5 conformation with the postulated X4 conformation of the V3 region (positively charged residue at position 322) reveals that electrostatic repulsion between residues 304 and 322 in X4 strains triggers the observed one register shift in the N-terminal strand of the V3 region. We posit that electrostatic interactions at the base of the V3 [beta]-hairpin can modulate the conformation and thereby influence the phenotype switch. In addition, we suggest that interstrand cation-[pi] interactions between positively charged and aromatic residues induce the switch to the X4 conformation as a result of the S306R mutation. The existence of three pairs of identical (or very similar) amino acids in the V3 C-terminal strand facilitates the switch between the R5 and X4 conformations. 447-52D | gp120 | NMR
language: eng
source:
identifier: ISSN: 0027-8424
fulltext: fulltext
issn:
  • 00278424
  • 0027-8424
url: Link


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titleMolecular switch for alternative conformations of the HIV-1 V3 region: implications for phenotype conversion.
creatorRosen, Osnat ; Sharon, Michal ; Quadt-Akabayov, Sabine R ; Anglister, Jacob
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ispartofProceedings of the National Academy of Sciences of the United States of America, September 19, 2006, Vol.103(38), pp.13950-13955
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subjectAmino Acid Sequence–Metabolism ; Chemokines–Chemistry ; Crystallography, X-Ray–Genetics ; HIV Envelope Protein Gp120–Metabolism ; HIV-1–Metabolism ; Humans–Pathogenicity ; Hydrogen Bonding–Chemistry ; Models, Molecular–Genetics ; Molecular Sequence Data–Metabolism ; Nuclear Magnetic Resonance, Biomolecular–Metabolism ; Peptide Fragments–Metabolism ; Phenotype–Metabolism ; Point Mutation–Metabolism ; Protein Binding–Metabolism ; Protein Conformation–Metabolism ; Static Electricity–Metabolism ; Chemokines ; HIV Envelope Protein Gp120 ; HIV Envelope Protein Gp120 (305-321) ; Peptide Fragments
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descriptionHIV-1 coreceptor usage plays a critical role in virus tropism and pathogenesis. A switch from CCRS- to CXCR4-using viruses occurs during the course of HIV-1 infection and correlates with subsequent disease progression. A single mutation at position 322 within the V3 loop of the HIV-1 envelope glycoprotein gp120, from a negatively to a positively charged residue, was found to be sufficient to switch an R5 virus to an X4 virus. In this study, the NMR structure of the V3 region of an R5 strain, HIV-[1.sub.JR-FL], in complex with an HIV-1-neutralizing antibody was determined. Positively charged and negatively charged residues at positions 304 and 322, respectively, oppose each other in the [beta]-hairpin structure, enabling a favorable electrostatic interaction that stabilizes the postulated R5 conformation. Comparison of the R5 conformation with the postulated X4 conformation of the V3 region (positively charged residue at position 322) reveals that electrostatic repulsion between residues 304 and 322 in X4 strains triggers the observed one register shift in the N-terminal strand of the V3 region. We posit that electrostatic interactions at the base of the V3 [beta]-hairpin can modulate the conformation and thereby influence the phenotype switch. In addition, we suggest that interstrand cation-[pi] interactions between positively charged and aromatic residues induce the switch to the X4 conformation as a result of the S306R mutation. The existence of three pairs of identical (or very similar) amino acids in the V3 C-terminal strand facilitates the switch between the R5 and X4 conformations. 447-52D | gp120 | NMR
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