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Biomolecules 2015, 5(4), 2808-2839;

HIV-1 Recruits UPF1 but Excludes UPF2 to Promote Nucleocytoplasmic Export of the Genomic RNA

HIV-1 RNA Trafficking Laboratory, Lady Davis Institute for Medical Research-Sir Mortimer B. Davis Jewish General Hospital, Montréal QC H3T 1E2, Canada
Department of Medicine, Division of Experimental Medicine, McGill University, Montréal QC H3A 2B4, Canada
Department of Microbiology and Immunology, McGill University, Montréal QC H3T 1E2, Canada
Laboratory of Molecular and Cellular Virology, Virology Program, Biomedical Sciences Institute, Faculty of Medicine, Universidad de Chile, Independencia 8389100, Santiago, Chile
Department of Pediatric Oncology, Hematology and Immunology, Heidelberg 69120, Germany
European Molecular Biology Laboratory, Partnership Unit, University of Heidelberg Molecular Medicine, Heidelberg 69117, Germany
Institute for Genetics, University of Cologne, Cologne 50674, Germany
Author to whom correspondence should be addressed.
Academic Editor: André Gerber
Received: 7 July 2015 / Revised: 9 September 2015 / Accepted: 16 September 2015 / Published: 20 October 2015
(This article belongs to the Special Issue RNA-Binding Proteins—Structure, Function, Networks and Disease)
Full-Text   |   PDF [6665 KB, uploaded 20 October 2015]   |  


Unspliced, genomic HIV-1 RNA (vRNA) is a component of several ribonucleoprotein complexes (RNP) during the viral replication cycle. In earlier work, we demonstrated that the host upframeshift protein 1 (UPF1), a key factor in nonsense-mediated mRNA decay (NMD), colocalized and associated to the viral structural protein Gag during viral egress. In this work, we demonstrate a new function for UPF1 in the regulation of vRNA nuclear export. OPEN ACCESS Biomolecules 2015, 5 2809 We establish that the nucleocytoplasmic shuttling of UPF1 is required for this function and demonstrate that UPF1 exists in two essential viral RNPs during the late phase of HIV-1 replication: the first, in a nuclear export RNP that contains Rev, CRM1, DDX3 and the nucleoporin p62, and the second, which excludes these nuclear export markers but contains Gag in the cytoplasm. Interestingly, we observed that both UPF2 and the long isoform of UPF3a, UPF3aL, but not the shorter isoforms UPF3aS and UPF3b, are excluded from the UPF1-Rev-CRM1-DDX3 complex as they are negative regulators of vRNA nuclear export. In silico protein-protein docking analyses suggest that Rev binds UPF1 in a region that overlaps the UPF2 binding site, thus explaining the exclusion of this negative regulatory factor by HIV-1 that is necessary for vRNA trafficking. This work uncovers a novel and unique regulatory circuit involving several UPF proteins that ultimately regulate vRNA nuclear export and trafficking. View Full-Text
Keywords: HIV-1; UPF1; ribonucleoprotein; nuclear RNA export; viral evasion; nonsense mediated decay HIV-1; UPF1; ribonucleoprotein; nuclear RNA export; viral evasion; nonsense mediated decay

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Ajamian, L.; Abel, K.; Rao, S.; Vyboh, K.; García-de-Gracia, F.; Soto-Rifo, R.; Kulozik, A.E.; Gehring, N.H.; Mouland, A.J. HIV-1 Recruits UPF1 but Excludes UPF2 to Promote Nucleocytoplasmic Export of the Genomic RNA. Biomolecules 2015, 5, 2808-2839.

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