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RNA and protein components of maize streak and cassava latent viruses
Abstract:
Polyacrylamide gel electrophoresis indicated that maize streak (MSV) and cassava latent (CLV) viruses each contain one species of protein and two of RNA. The estimated protein mol. wt is 28000 for MSV and 34000 for CLV. The mol. wts obtained for the two RNA species using formamide-containing gels were the same for the two viruses: 1-7 X 10(6) and 1-3 X 10(6). It is suggested that the viruses have a two-part genome and that the tendency of their nucleoprotein particles to form pairs favours the delivery of complete genomes to sites of infection.
Insights
Maize streak virus (MSV) and cassava latent virus (CLV) possess one protein and two RNA species. Their paired nucleoprotein particles may facilitate complete genome delivery during infection.
Area of Science:
- Plant virology
- Molecular biology
- Biochemistry
Background:
- Maize streak virus (MSV) and cassava latent virus (CLV) are significant pathogens affecting important crops.
- Understanding the molecular composition of these viruses is crucial for developing effective control strategies.
Purpose of the Study:
- To elucidate the protein and RNA composition of MSV and CLV.
- To determine the molecular weights of viral proteins and RNA species.
- To investigate the potential genomic structure and infection mechanism of MSV and CLV.
Main Methods:
- Polyacrylamide gel electrophoresis (PAGE) was employed to separate and analyze viral components.
- Formamide-containing gels were used for accurate molecular weight determination of RNA species.
Main Results:
- Both MSV and CLV were found to contain a single protein species with estimated molecular weights of 28,000 Da (MSV) and 34,000 Da (CLV).
- Two distinct RNA species were identified in both viruses, with molecular weights of 1.7 x 10^6 and 1.3 x 10^6 Da.
- The RNA molecular weights were consistent between MSV and CLV.
Conclusions:
- The findings suggest that MSV and CLV possess a bipartite genome, consisting of two separate RNA molecules.
- The tendency of their nucleoprotein particles to form pairs is hypothesized to aid in the delivery of the complete bipartite genome to host cells during infection.