Fiche publication
Date publication
janvier 2015
Journal
Nucleic acids research
Auteurs
Membres identifiés du Cancéropôle Est :
Dr RASSAM Patrice
Tous les auteurs :
Chamontin C, Rassam P, Ferrer M, Racine PJ, Neyret A, Lainé S, Milhiet PE, Mougel M
Lien Pubmed
Résumé
HIV-1, the agent of the AIDS pandemic, is an RNA virus that reverse transcribes its RNA genome (gRNA) into DNA, shortly after its entry into cells. Within cells, retroviral assembly requires thousands of structural Gag proteins and two copies of gRNA as well as cellular factors, which converge to the plasma membrane in a finely regulated timeline. In this process, the nucleocapsid domain of Gag (GagNC) ensures gRNA selection and packaging into virions. Subsequent budding and virus release require the recruitment of the cellular ESCRT machinery. Interestingly, mutating GagNC results into the release of DNA-containing viruses, by promo-ting reverse transcription (RTion) prior to virus release, through an unknown mechanism. Therefore, we explored the biogenesis of these DNA-containing particles, combining live-cell total internal-reflection fluorescent microscopy, electron microscopy, trans-complementation assays and biochemical characterization of viral particles. Our results reveal that DNA virus production is the consequence of budding defects associated with Gag aggregation at the plasma membrane and deficiency in the recruitment of Tsg101, a key ESCRT-I component. Indeed, targeting Tsg101 to virus assembly sites restores budding, restricts RTion and favors RNA packaging into viruses. Altogether, our results highlight the role of GagNC in the spatiotemporal control of RTion, via an ESCRT-I-dependent mechanism.
Mots clés
Cell Line, Cell Membrane, metabolism, DNA, Viral, biosynthesis, DNA-Binding Proteins, metabolism, Endosomal Sorting Complexes Required for Transport, metabolism, HIV-1, genetics, HeLa Cells, Humans, Reverse Transcription, Sequence Deletion, Transcription Factors, metabolism, Virion, metabolism, Virus Assembly, Zinc Fingers, gag Gene Products, Human Immunodeficiency Virus, chemistry
Référence
Nucleic Acids Res. 2015 01;43(1):336-47
