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  • Title: Structure-function relationships of the HIV-1 envelope V3 loop tropism determinant: evidence for two distinct conformations.
    Author: Ebenbichler C, Westervelt P, Carrillo A, Henkel T, Johnson D, Ratner L.
    Journal: AIDS; 1993 May; 7(5):639-46. PubMed ID: 7686374.
    Abstract:
    OBJECTIVE: The V3 loop of the HIV-1 envelope glycoprotein gp120 is an important determinant of HIV-1-specific cell tropism. Nine different purified envelope proteins were prepared in order to examine the association between the structure of the gp120 proteins and functional properties of HIV-1 virions differing in their tropism for T-cell lines and macrophages. RESULTS: Six monoclonal antibodies to the V3 loop reacted preferentially with T-cell line-tropic gp120 envelope proteins, and one monoclonal antibody reacted preferentially with macrophage-tropic gp120 envelope proteins. T-cell line-tropic gp120 envelope proteins were at least 10-fold more susceptible to V3 loop proteolytic cleavage by human thrombin, and 1000-fold more susceptible to V3 loop proteolytic cleavage by human mast cell tryptase than macrophage-tropic gp120 envelope proteins. CONCLUSIONS: These findings suggest that there are two distinct conformations for the V3 loop of T-cell line-tropic and macrophage-tropic gp120 envelope proteins.
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