

PLoS Pathog. 2013 9 (4): e1003278

PMID: 23592992 · PMCID: PMC3616983 · DOI:10.1371/journal.ppat.1003278

The incorporation of the envelope glycoprotein complex (Env) onto the developing particle is a crucial step in the HIV-1 lifecycle. The long cytoplasmic tail (CT) of Env is required for the incorporation of Env onto HIV particles in T cells and macrophages. Here we identify the Rab11a-FIP1C/RCP protein as an essential cofactor for HIV-1 Env incorporation onto particles in relevant human cells. Depletion of FIP1C reduced Env incorporation in a cytoplasmic tail-dependent manner, and was rescued by replenishment of FIP1C. FIP1C was redistributed out of the endosomal recycling complex to the plasma membrane by wild type Env protein but not by CT-truncated Env. Rab14 was required for HIV-1 Env incorporation, and FIP1C mutants incapable of binding Rab14 failed to rescue Env incorporation. Expression of FIP1C and Rab14 led to an enhancement of Env incorporation, indicating that these trafficking factors are normally limiting for CT-dependent Env incorporation onto particles. These findings support a model for HIV-1 Env incorporation in which specific targeting to the particle assembly microdomain on the plasma membrane is mediated by FIP1C and Rab14.

MeSH Terms (16)

Adaptor Proteins, Signal Transducing Cell Line, Tumor Cell Membrane Cells, Cultured env Gene Products, Human Immunodeficiency Virus HeLa Cells HIV-1 HIV Infections Humans Membrane Proteins Protein Transport rab GTP-Binding Proteins RNA Interference Virus Assembly Virus Internalization Virus Replication

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