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Updated: Aug 29, 2026

Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers
Published on: March 8, 2012
Cell surface expression of the HIV-1 envelope glycoproteins is directed from intracellular CTLA-4-containing
Luis R Miranda1, Brian C Schaefer, Abraham Kupfer
1Department of Cellular and Structural Biology, Program in Cell and Developmental Biology, University of Colorado Health Sciences Center, Box B-111, 4200 East Ninth Avenue, Denver, CO 80262, USA.
Abstract:
The envelope glycoprotein (Env) of HIV-1 is incorporated into virions that bud from the cell surface of infected T cells. With immunofluorescence microscopy and subcellular membrane fractionation techniques, the intracellular fate of Env in the secretory pathway of HIV-1-infected T cells was evaluated. Rather than trafficking constitutively from the Golgi to the cell surface, Env is directed to intracellular CTLA-4-containing granules, whose recruitment to the cell surface is regulated. The use of the regulated pathway for intracellular Env storage before virion assembly holds implications for the staging of Env exposure at the cell surface of infected cells and of coordinating HIV virion assembly.
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