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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Differential incorporation of uracil DNA glycosylase UNG2 into HIV-1, HIV-2, and SIV(MAC) viral particles.

We have previously reported that the host uracil DNA glycosylase UNG2 enzyme is incorporated into HIV-1 virions via a specific association with the viral integrase (IN) domain of Gag-Pol precursor. In this study, we investigated whether UNG2 was packaged into two phylogenetically closely related primate lentiviruses, HIV-2(ROD) and SIV(MAC239). We demonstrated by GST-pull-down and coprecipitation assays that INs from HIV-1, HIV-2(ROD), and SIV(MAC239) associated with UNG2, although the interaction of UNG2 with HIV-2(ROD) IN and SIV(MAC239) IN was less strong than with HIV-1 IN. We then showed by Western blotting that highly purified HIV-2 and SIV(MAC) viral particles did not incorporate host UNG2, contrasting with the presence of UNG2 in HIV-1 viral particles. Finally, we showed that HIV-1/ SIV chimeric viruses in which residues 6 to 202 of HIV-1 IN were replaced by the SIV counterpart were impaired for packaging of UNG2, indicating that the incorporation of host UNG2 into viral particles is the hallmark of the HIV-1 strain. Moreover, we found that HIV-1/ SIV IN chimeric viruses were deficient for viral propagation.[1]


  1. Differential incorporation of uracil DNA glycosylase UNG2 into HIV-1, HIV-2, and SIV(MAC) viral particles. Priet, S., Navarro, J.M., Gros, N., Quérat, G., Sire, J. Virology (2003) [Pubmed]
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