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2013 ; 87
(22
): 12339-48
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Analysis of borna disease virus trafficking in live infected cells by using a
virus encoding a tetracysteine-tagged p protein
#MMPMID24027309
Charlier CM
; Wu YJ
; Allart S
; Malnou CE
; Schwemmle M
; Gonzalez-Dunia D
J Virol
2013[Nov]; 87
(22
): 12339-48
PMID24027309
show ga
Borna disease virus (BDV) is a nonsegmented, negative-stranded RNA virus
characterized by noncytolytic persistent infection and replication in the nuclei
of infected cells. To gain further insight on the intracellular trafficking of
BDV components during infection, we sought to generate recombinant BDV (rBDV)
encoding fluorescent fusion viral proteins. We successfully rescued a virus
bearing a tetracysteine tag fused to BDV-P protein, which allowed assessment of
the intracellular distribution and dynamics of BDV using real-time live imaging.
In persistently infected cells, viral nuclear inclusions, representing viral
factories tethered to chromatin, appeared to be extremely static and stable,
contrasting with a very rapid and active trafficking of BDV components in the
cytoplasm. Photobleaching (fluorescence recovery after photobleaching [FRAP] and
fluorescence loss in photobleaching [FLIP]) imaging approaches revealed that BDV
components were permanently and actively exchanged between cellular compartments,
including within viral inclusions, albeit with a fraction of BDV-P protein not
mobile in these structures, presumably due to its association with viral and/or
cellular proteins. We also obtained evidence for transfer of viral material
between persistently infected cells, with routing of the transferred components
toward the cell nucleus. Finally, coculture experiments with noninfected cells
allowed visualization of cell-to-cell BDV transmission and movement of the
incoming viral material toward the nucleus. Our data demonstrate the potential of
tetracysteine-tagged recombinant BDV for virus tracking during infection, which
may provide novel information on the BDV life cycle and on the modalities of its
interaction with the nuclear environment during viral persistence.