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Updated: May 25, 2026

Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers
Published on: March 8, 2012
Human immunodeficiency virus type 1 envelope proteins traffic toward virion assembly sites via a
Dikla Nachmias1, Ella H Sklan, Marcelo Ehrlich
1Department of Cell Research and Immunology, The George S, Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
Background:
The cellular activity of many factors and pathways is required to execute the complex replication cycle of the human immunodeficiency virus type 1 (HIV-1). To reveal these cellular components, several extensive RNAi screens have been performed, listing numerous 'HIV-dependency factors'. However, only a small overlap between these lists exists, calling for further evaluation of the relevance of specific factors to HIV-1 replication and for the identification of additional cellular candidates. TBC1D20, the GTPase-activating protein (GAP) of Rab1, regulates endoplasmic reticulum (ER) to Golgi trafficking, was not identified in any of these screens, and its involvement in HIV-1 replication cycle is tested here.
Findings:
Excessive TBC1D20 activity perturbs the early trafficking of HIV-1 envelope protein through the secretory pathway. Overexpression of TBC1D20 hampered envelope processing and reduced its association with detergent-resistant membranes, entailing a reduction in infectivity of HIV-1 virion like particles (VLPs).
Conclusions:
These findings add TBC1D20 to the network of host factors regulating HIV replication cycle.
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