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2017 ; 8
(1
): 563
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Functional organization of cytoplasmic inclusion bodies in cells infected by
respiratory syncytial virus
#MMPMID28916773
Rincheval V
; Lelek M
; Gault E
; Bouillier C
; Sitterlin D
; Blouquit-Laye S
; Galloux M
; Zimmer C
; Eleouet JF
; Rameix-Welti MA
Nat Commun
2017[Sep]; 8
(1
): 563
PMID28916773
show ga
Infection of cells by respiratory syncytial virus induces the formation of
cytoplasmic inclusion bodies (IBs) where all the components of the viral RNA
polymerase complex are concentrated. However, the exact organization and function
of these IBs remain unclear. In this study, we use conventional and
super-resolution imaging to dissect the internal structure of IBs. We observe
that newly synthetized viral mRNA and the viral transcription anti-terminator
M2-1 concentrate in IB sub-compartments, which we term "IB-associated granules"
(IBAGs). In contrast, viral genomic RNA, the nucleoprotein, the L polymerase and
its cofactor P are excluded from IBAGs. Live imaging reveals that IBAGs are
highly dynamic structures. Our data show that IBs are the main site of viral RNA
synthesis. They further suggest that shortly after synthesis in IBs, viral mRNAs
and M2-1 transiently concentrate in IBAGs before reaching the cytosol and suggest
a novel post-transcriptional function for M2-1.Respiratory syncytial virus (RSV)
induces formation of inclusion bodies (IBs) sheltering viral RNA synthesis. Here,
Rincheval et al. identify highly dynamic IB-associated granules (IBAGs) that
accumulate newly synthetized viral mRNA and the viral M2-1 protein but exclude
viral genomic RNA and RNA polymerase complexes.