Confocal immunofluorescence analysis of HeLa cells expressing the HIV-1 Vpr accessory protein. The picture shows the accumulation of Vpr (red) into discrete foci dispersed in the nucleus (the nuclear membrane is delineated by an anti-nucleoporin staining shown in blue). These foci contain the E3 ubiquitin ligase component VprBP (Vpr-binding protein, DCAF1), associate with chromatin, and display rapid saltatory movement inside the nucleus. Interference with the formation or function of these subnuclear structures through genetic manipulations or other means inevitably impairs the induction of G2/M arrest by Vpr, demonstrating their critical contributions to the cytostatic properties of the viral protein (see Belzile et al., doi:10.1371/journal.ppat.1001080).
Image Credit: Levon G. Abrahamyan, Institut de Recherches Cliniques de Montréal (IRCM)
Opinion
Breaking the Stereotype: Virulence Factor–Mediated Protection of Host Cells in Bacterial Pathogenesis
PLOS Pathogens: published September 16, 2010 | https://doi.org/10.1371/journal.ppat.1001057
Pearls
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