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Molecular studies on bromovirus capsid protein
F Osman1, Y G Choi, G L Grantham
1Department of Plant Pathology, University of California, Riverside, Calfornia, 92521-0122, USA.
Virology
|December 5, 1998
Summary
Brome mosaic virus (BMV) coat protein (CP) specifically packages its own RNA, unlike cucumber mosaic virus (CMV) CP, which shows broader packaging ability. This difference impacts viral infectivity and encapsidation efficiency.
Area of Science:
- Plant Virology
- Molecular Biology
- RNA Virus Assembly
Background:
- Brome mosaic bromovirus (BMV) and cucumber mosaic cucumovirus (CMV) are closely related RNA viruses.
- Coat proteins (CPs) are crucial for viral encapsidation and host specificity.
Purpose of the Study:
- To investigate the in vivo encapsidation specificity of BMV and CMV coat proteins.
- To analyze the role of CP in viral RNA packaging and infectivity using chimeric constructs.
Main Methods:
- Construction of RNA3 chimeras with exchanged CP genes between BMV and CMV.
- Analysis of chimera replication in Nicotiana benthamiana protoplasts.
- Assessment of infectivity in Chenopodium quinoa and N. benthamiana hosts.
- In vivo encapsidation assays using protoplasts.
Main Results:
- Chimeric RNA3 replicated efficiently and produced expected CPs when co-inoculated with wild-type genomic RNAs.
- Chimeric viruses were noninfectious in common permissive hosts.
- CMV CP could package BMV RNA, but less efficiently than BMV CP.
- BMV CP could not package CMV RNA, indicating high specificity.
Conclusions:
- BMV CP exhibits a high degree of specificity for packaging its cognate RNA in vivo.
- CMV CP demonstrates less stringent RNA packaging specificity.
- CP specificity is a key factor influencing viral infectivity and assembly.