VP19 is important for the envelope coating of white spot syndrome virus

•Inhibition of VP19 expression by RNAi dramatically reduces WSSV replication in infected animals.•Inhibition of VP19 expression results in the production of a large amount of incomplete enveloped virions.•VP19 is essential for WSSV envelope coating. VP19 is a major envelope protein of white spot syn...

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Bibliographic Details
Published in:Virus research 2019-09, Vol.270, p.197666-197666, Article 197666
Main Authors: Li, Li, Hong, Yongcong, Qiu, Huaina, Yang, Feng, Li, Fang
Format: Article
Language:English
Subjects:
Envelope coating
RNA interference
VP19
White spot syndrome virus
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Summary:•Inhibition of VP19 expression by RNAi dramatically reduces WSSV replication in infected animals.•Inhibition of VP19 expression results in the production of a large amount of incomplete enveloped virions.•VP19 is essential for WSSV envelope coating. VP19 is a major envelope protein of white spot syndrome virus (WSSV), an important pathogen of farmed shrimp. However, the exact function of VP19 in WSSV assembly and infection is unknown. To understand the function of VP19, the gene was knocked down by RNA interference. We found that the dsRNA specific for vp19 gene dramatically reduced the replication of WSSV genomic DNA in infected animals. Further investigation by transmission electron microscopy showed that inhibition of VP19 prevented envelope coating of progeny virions, resulting in a high amount of immature virus particles without outer layer (envelope) in the host cells. This finding was further confirmed by SDS–PAGE analysis, which showed the loss of VP19 and other envelope proteins from the improperly assembled virions. These results suggest that VP19 is essential for WSSV envelope coating.
ISSN:0168-1702
1872-7492
DOI:10.1016/j.virusres.2019.197666