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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2016 ; 291
(50
): 25789-25798
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Borna Disease Virus Assembles Porous Cage-like Viral Factories in the Nucleus
#MMPMID27803166
Hirai Y
; Hirano Y
; Matsuda A
; Hiraoka Y
; Honda T
; Tomonaga K
J Biol Chem
2016[Dec]; 291
(50
): 25789-25798
PMID27803166
show ga
Animal-derived RNA viruses frequently generate viral factories in infected cells.
However, the details of how RNA viruses build such intracellular structures are
poorly understood. In this study, we examined the structure and formation of the
viral factories, called viral speckle of transcripts (vSPOTs), that are produced
in the nuclei of host cells by Borna disease virus (BDV). Super-resolution
microscopic analysis showed that BDV assembled vSPOTs as intranuclear cage-like
structures with 59-180-nm pores. The viral nucleoprotein formed the exoskeletons
of vSPOTs, whereas the other viral proteins appeared to be mainly localized
within these structures. In addition, stochastic optical reconstruction
microscopy revealed that filamentous structures resembling viral
ribonucleoprotein complexes (RNPs) appeared to protrude from the outer surfaces
of the vSPOTs. We also found that vSPOTs disintegrated into RNPs concurrently
with the breakdown of the nuclear envelope during mitosis. These observations
demonstrated that BDV generates viral replication factories whose shape and
formation are regulated, suggesting the mechanism of the integrity of RNA virus
persistent infection in the nucleus.