Production and characterization of a human monoclonal antibody, reactive with a conserved epitope on gp41 of human immunodeficiency virus type I - PubMed (original) (raw)
Production and characterization of a human monoclonal antibody, reactive with a conserved epitope on gp41 of human immunodeficiency virus type I
V J Teeuwsen et al. AIDS Res Hum Retroviruses. 1990 Mar.
Abstract
A human Epstein-Barr virus-transformed lymphoblastoid B-cell line was generated from peripheral blood mononuclear cells (PBMC) of an asymptomatic human immunodeficiency virus type I (HIV-1) seropositive donor, which produces a human monoclonal antibody K14 (IgG1), reactive with an epitope on the transmembrane part (gp41) of the envelope glycoprotein of HIV-1. This monoclonal antibody reacts with a lysate of HIV-1-infected H9 cells, gradient purified HIV-1, and a vaccinia recombinant HIV-1 gp160 protein, but not with HIV-2 antigens in an enzyme-linked immunosorbent assay (ELISA). When used as an immobilized ligand in an immune affinity column, K14 selectively purifies gp41 from a HIV-1-infected H9 cell lysate. Although no reactivity was observed in ELISA with a panel of partially overlapping synthetic nonapeptides spanning the whole length of HIV-1 gp41, it was shown to react with recombinant envelope proteins, provided that they did contain amino acids 643-692: deletion of this part resulted in the disappearance of the reactivity. Testing of an extensive panel of the sera from HIV-1 seropositive or seronegative donors from Europe and Africa, including a selected group of donors before and after HIV-1 seroconversion, in a competition ELISA with horseradish peroxidase-conjugated K14, showed that the epitope recognized on gp41 is immunodominant and conserved. K14 does not neutralize HIV-1 infectivity or virus-mediated cell fusion, and does not mediate antibody-dependent cellular cytotoxicity.
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