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Related Experiment Videos

RNA structural features responsible for potato spindle tuber viroid pathogenicity

R A Owens1, G Steger, Y Hu

  • 1Molecular Plant Pathology Laboratory, Plant Sciences Institute, U.S. Department of Agriculture/Agricultural Research Service, Beltsville, Maryland 20705, USA. ROWENS@ASRR.ARSUSDA.GOV

Virology
|August 1, 1996
PubMed
Summary
This summary is machine-generated.

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Potato spindle tuber viroid (PSTVd) pathogenicity depends on its RNA structure. Alterations in the pathogenicity domain

Area of Science:

  • Plant pathology
  • Molecular biology
  • Virology

Background:

  • Potato spindle tuber viroid (PSTVd) causes significant crop damage.
  • PSTVd's pathogenicity is linked to its structural domains, particularly the pathogenicity domain.
  • A specific "premelting region" within the pathogenicity domain is hypothesized to be crucial for disease induction.

Purpose of the Study:

  • To investigate the biological and structural properties of 12 PSTVd sequence variants.
  • To determine the relationship between PSTVd structure, replication, and symptom severity.
  • To elucidate the role of the pathogenicity domain's geometry in viroid pathogenesis.

Main Methods:

  • Quantitative bioassays to assess pathogenicity.
  • Temperature gradient gel electrophoresis of circularized RNA transcripts to analyze structure.

Related Experiment Videos

  • Thermodynamic calculations to predict RNA stability and structure.
  • Comparison of secondary structures and three-dimensional geometry of pathogenicity domains.

    • Main Results:

    • Mutations affected PSTVd pathogenicity both directly and indirectly (via replication/accumulation rates).
    • No direct correlation was found between symptom severity and RNA melting temperature.
    • Variants with intermediate symptoms had a linear pathogenicity domain, while mild/severe variants had bent domains.

    Conclusions:

    • PSTVd pathogenicity is influenced by structural alterations in its pathogenicity domain.
    • Changes in the three-dimensional geometry of the pathogenicity domain, potentially affecting RNA-protein interactions, are key to viroid pathogenicity.
    • Understanding these structural-functional relationships can inform strategies to control PSTVd.