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Nucleic acid transport in plant-pathogen interactions

R Lartey1, V Citovsky

  • 1Department of Biochemistry and Cell Biology, State University of New York, Stony Brook 11794-5215, USA.

Genetic Engineering
|January 1, 1997
PubMed
Summary

Pathogens use specialized proteins to move nucleic acids between plant cells and into the nucleus. This involves viral movement proteins and Agrobacterium tumefaciens proteins facilitating transport via plasmodesmata and nuclear import machinery.

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Area of Science:

  • Plant pathology
  • Molecular biology
  • Cell biology

Background:

  • Plant-pathogen interactions involve complex molecular exchanges.
  • Efficient transport of pathogen-derived nucleic acids is crucial for infection.

Purpose of the Study:

  • To describe the mechanisms of inter- and intracellular nucleic acid transport during plant-pathogen interactions.
  • To highlight the roles of pathogen-encoded proteins in these transport processes.

Main Methods:

  • Comparative analysis of plant virus cell-to-cell movement.
  • Investigation of Agrobacterium T-DNA nuclear import pathways.

Main Results:

  • Plant viruses utilize movement proteins to traverse plasmodesmata, involving nucleoprotein complexes and cytoskeleton interactions.

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  • Agrobacterium tumefaciens T-DNA import into the plant nucleus is mediated by VirD2 and VirE2 proteins, which provide nuclear localization signals (NLSs).
  • VirD2 NLS is conserved across species, while VirE2 NLS is plant-specific, both interacting with host nuclear import machinery.

    • Conclusions:

    • Pathogen-mediated nucleic acid transport relies on specialized proteins.
    • Understanding these mechanisms provides insights into plant defense and infection strategies.
    • Targeting these transport systems could offer novel strategies for disease control.