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A conserved, precise RNA encapsidation pattern in Tobamovirus particles

T M Wilson1, J W McNicol

  • 1Department of Virology, Scottish Crop Research Institute, Invergowrie, Dundee, U.K.

Archives of Virology
|January 1, 1995
PubMed
Summary
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The RNA encapsidation pathway in Tobamoviruses precisely assembles RNA and coat proteins. This conserved mechanism, despite genome variations, influences viral protein composition and particle interactions.

Area of Science:

  • Virology
  • Molecular Biology
  • Structural Biology

Background:

  • Tobamoviruses exhibit a conserved RNA encapsidation pathway.
  • Genome length and origin-of-assembly sequences show interstrain variation.
  • A Type 2 Tobamovirus genome deviates from the Type 1 pattern.

Purpose of the Study:

  • To investigate the conserved RNA encapsidation pathway in Type 1 Tobamoviruses.
  • To analyze the positioning of guanine (G) residues in relation to coat protein assembly.
  • To understand the implications for viral particle assembly and host interactions.

Main Methods:

  • Comparative genomic analysis of nine Type 1 Tobamovirus genomes.
  • Sequence analysis to identify G biases and codon usage.
  • Examination of G-repeat positioning within coat protein binding sites.

Related Experiment Videos

Main Results:

  • A conserved RNA-coat protein assembly occurs adjacent to the 5'-cap structure.
  • A significant bias for guanine (G) at every third position was observed, influencing protein composition.
  • Contrary to predictions, G-repeat positioning in coat protein binding sites varied among Type 1 strains.

Conclusions:

  • The precise RNA encapsidation pathway is highly conserved in Type 1 Tobamoviruses.
  • Guanine bias impacts viral protein synthesis and potentially assembly dynamics.
  • Variations in G-repeat positioning may affect tobacco mosaic virus (TMV) assembly, disassembly, and host interactions.