Architecture of torovirus replicative organelles.
Mol Microbiol
; 117(4): 837-850, 2022 04.
Article
in English
| MEDLINE | ID: covidwho-1591403
ABSTRACT
Plus-stranded RNA viruses replicate in the cytosol of infected cells, in membrane-bound replication complexes. We previously identified double membrane vesicles (DMVs) in the cytoplasm of cells infected with Berne virus (BEV), the prototype member of the Torovirus genus (Nidovirales Order). Our previous analysis by transmission electron microscopy suggested that the DMVs form a reticulovesicular network (RVN) analogous those described for the related severe acute respiratory syndrome coronavirus (SARS-CoV-1). Here, we used serial sectioning and electron tomography to characterize the architecture of torovirus replication organelles, and to learn about their biogenesis and dynamics during the infection. The formation of a RVN in BEV infected cells was confirmed, where the outer membranes of the DMVs are interconnected with each other and with the ER. Paired or zippered ER membranes connected with the DMVs were also observed, and likely represent early structures that evolve to give rise to DMVs. Also, paired membranes forming small spherule-like invaginations were observed at late time post-infection. Although resembling in size, the tomographic analysis show that these structures are clearly different from the true spherules described previously for coronaviruses. Hence, BEV shows important similarities, but also some differences, in the architecture of the replication organelles with other nidoviruses.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Torovirus
Language:
English
Journal:
Mol Microbiol
Journal subject:
Molecular Biology
/
Microbiology
Year:
2022
Document Type:
Article
Affiliation country:
Mmi.14875
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