Plant pararetroviruses: interactions of cauliflower mosaic virus with plants and insects

•A virus associated protein mediates both virus cell-to-cell movement and insect transmission.•An insect-stylet-based receptor as viral insect transmission factor.•A viral protein involved in assembly, storage, translation and counter defense.•An RNA-based silencing suppressor is described.•A viral...

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Bibliographic Details
Published in:Current opinion in virology 2013-12, Vol.3 (6), p.629-638
Main Author: Hohn, Thomas
Format: Article
Language:English
Subjects:
Animals
Aphididae
Cauliflower mosaic virus
Caulimovirus - physiology
Host-Pathogen Interactions
Insecta - virology
Plants - virology
Protein Binding
Viral Proteins - metabolism
Virus Attachment
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Description
Summary:•A virus associated protein mediates both virus cell-to-cell movement and insect transmission.•An insect-stylet-based receptor as viral insect transmission factor.•A viral protein involved in assembly, storage, translation and counter defense.•An RNA-based silencing suppressor is described.•A viral silencing suppressor interferes with the tasiRNA pathway. Virion associated protein (VAP) binds to the icosahedral capsid of cauliflower mosaic virus (CaMV) — a plant pararetrovirus. The interactive coiled-coil domains of this protein can interact with the coiled-coils of either the movement protein or the aphid transmission factor, thereby mediating both cell-to-cell movement and aphid transmission. The host counters CaMV infection with two lines of defense: innate immunity and silencing. The viral protein ‘transactivator/viroplasmin’ (TAV) is recognized as an effector and either initiates the innate immunity reaction in a non-permissive host or interferes with it in a permissive host. As a silencing suppressor, TAV interferes with dicing of dsRNAs.
ISSN:1879-6257
1879-6265
DOI:10.1016/j.coviro.2013.08.014