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Complex molecular architecture of beet yellows virus particles
Valera V Peremyslov1, Igor A Andreev, Alexey I Prokhnevsky
1Department of Botany and Plant Pathology and Center for Gene Research and Biotechnology, Oregon State University, Corvallis, OR 97331, USA.
Summary
Beet yellows virus particles have complex tails containing viral RNA and specific proteins. This segmented tail structure, revealed by atomic force microscopy, offers new insights into closterovirus virion architecture.
Area of Science:
- Plant virology
- Molecular biology
- Structural biology
Background:
- Closteroviruses are plant viruses with long filamentous particles.
- Virions consist of a body (major capsid protein) and a tail (minor capsid protein).
- The function and precise composition of these virions are not fully understood.
Purpose of the Study:
- To investigate the molecular composition and architecture of beet yellows virus (BYV) particles.
- To elucidate the structure and components of the BYV virion tail.
Main Methods:
- Biochemical analyses
- Genetic analyses
- Ultrastructural analyses (Atomic Force Microscopy)
Main Results:
- BYV virion tails encapsulate the 5'-terminal ~650 nucleotides of the viral RNA.
- The tail incorporates the minor capsid protein, Hsp70-homolog, 64-kDa protein, and 20-kDa protein.
- Atomic force microscopy revealed a segmented tail morphology, with the 20-kDa protein likely forming the tip.
Conclusions:
- Closterovirus virion tails have a more complex composition and structure than previously thought.
- The segmented tail structure has implications for virion assembly, RNA protection, and transport.
- These findings may inform our understanding of other virus families with similar particle structures.