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VPg-mediated aggregation of potyviral RNA
C S Luciano1, J F Murphy, R E Rhoads
1Department of Plant Pathology, University of Kentucky, Lexington 40546.
The Journal of General Virology
|January 1, 1991
Summary
Potyviruses, like tobacco vein mottling virus, exhibit genomic RNA aggregation due to a covalently bound protein, likely the viral protein genome-linked (VPg). This aggregation phenomenon was observed during RNA purification processes.
Area of Science:
- Virology
- Molecular Biology
- Plant Pathology
Background:
- Potyviruses are significant plant pathogens.
- Viral RNA structure and processing are crucial for understanding viral replication and pathogenesis.
- The role of viral proteins, such as VPg, in RNA stability and aggregation is not fully understood.
Purpose of the Study:
- To investigate the aggregation of genomic RNA in potyviruses.
- To identify the molecular factors responsible for RNA aggregation.
- To determine if this aggregation is specific to certain viral families.
Main Methods:
- Isolation and purification of viral RNA from potyvirus-infected plants.
- Electrophoretic analysis of viral RNA.
- Biochemical assays to identify protein-RNA interactions.
Main Results:
- Genomic RNA from tobacco vein mottling virus (a potyvirus) formed aggregates (20 and 41 kb species) during purification.
- Similar RNA aggregates were observed in two other potyviruses.
- Aggregation was dependent on a protein covalently linked to the 5' end of the viral RNA, likely the viral protein genome-linked (VPg).
- RNAs from unrelated viruses (tobacco mosaic virus, cowpea mosaic virus) did not aggregate under similar conditions.
Conclusions:
- A specific protein, likely VPg, covalently bound to the 5' terminus of potyviral RNA induces aggregation during purification.
- This RNA aggregation is a characteristic feature of potyviruses.
- The findings provide insights into the molecular mechanisms of potyviral RNA stability and processing.