title: Activation of gp120 of human immunodeficiency virus by their V3 loop-derived peptides.
abstract: V3 loop peptides from three different human immunodeficiency virus type 1 (HIV-1) strains were synthesized. BH10, ADA, and 89.6 strains whose infections are dependent on CXCR4, CCR5, and both, respectively, were selected. Co-transfection of luciferase reporter gene and corresponding envelope genes (HXB2, ADA, and 89.6) generate pseudotype viruses (HXB2/Luc, ADA/Luc, and 89.6/Luc). The effects of each peptide on the infection of U87 cells expressing CD4 and one of the coreceptors with all pseudotype viruses were evaluated. V3 loop peptide from BH10 (V3-BH10) alone increased the HXB2/Luc infection by 93% at 10 microM. Both V3-ADA and V3-89.6 enhanced ADA/Luc infection by 38% and by 55% at 10 microM, respectively. For 89.6/Luc infection, only V3-89.6 enhanced the infections on both target cells. V3-BH10 modulated the epitopes of coreceptor binding site and V2 loop of gp120 on HIV-1 IIIB infected H9 cells, indicating that V3 loop peptide activates viral gp120 and enhances infectivity.
authors.affiliation: Division of Allergy and Infectious Diseases, Department of Internal Medicine, Graduate School of Medicine, Tohoku University, 1-1, Seiryo-Machi, Aoba-ku, Sendai 980-8574, Japan.
authors.forename: Hong
authors.initials: H
authors.lastname: Ling
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Zhang
authors.forename: Osamu
authors.initials: O
authors.lastname: Usami
authors.forename: Toshio
authors.initials: T
authors.lastname: Hattori
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D002460:Cell Line; D015699:HIV Envelope Protein gp120 / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015497:HIV-1 / Q000502:physiology*; D006801:Humans; D007668:Kidney; D010446:Peptide Fragments / Q000737:chemistry / Q000378:metabolism; D010957:Plasmids; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D014162:Transfection
chemical_list: D000911:Antibodies, Monoclonal; D015699:HIV Envelope Protein gp120; D010446:Peptide Fragments; D011994:Recombinant Proteins