The viral genomes of alpha- and gamma-retroviruses follow an outbound route through the cytoplasm before assembling with the budding particle at the plasma membrane. We show here that murine leukemia virus (MLV) RNAs are transported on lysosomes and transferrin-positive endosomes. Transport on transferrin-positive vesicles requires both Gag and Env polyproteins. In the presence of Env, Gag is rerouted from lysosomes to transferrin-positive endosomes, and virion production becomes highly sensitive to drugs poisoning vesicular and endosomal traffic. Vesicular transport of the RNA does not require prior endocytosis, indicating that it is recruited directly from the cytosol. Viral prebudding complexes containing Env, Gag, and retroviral RNAs are thus formed on endosomes, and subsequently routed to the plasma membrane. This may allow retroviruses to hijack the endosomal machinery as part of their biosynthetic pathway. More generally, tethering to vesicles may provide an efficient mechanism for directed RNA transport.
Retroviral genomic RNAs are transported to the plasma membrane by endosomal vesicles
Basyuk, E.; Galli, T.; Mougel, M.; Blanchard, J. M.; Sitbon, M.; Bertrand, E.
2003-07 / vol 5 / pages 161-74
Humans; Animals; Mice; Models, Biological; Biological Transport; Cell Membrane/*metabolism; Genes, Reporter; Recombinant Proteins/metabolism; Retroviridae/*genetics; Green Fluorescent Proteins; 3T3 Cells; Endocytosis; RNA, Viral/*metabolism; Gene Products, env/metabolism; Luminescent Proteins/metabolism; Endosomes/*metabolism; Gene Products, gag/metabolism; Leukemia Virus, Murine/genetics/metabolism; Lysosomes/metabolism