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Going green: plants' alternative way to position the Ran gradient.

I Meier1, X M Xu, J Brkljacic

  • 1Plant Biotechnology Center and Department of Plant Cellular and Molecular Biology, The Ohio State University, 244 Rightmire Hall, 1060 Carmack Road, Columbus, Ohio 43210, USA. meier.56@osu.edu

Journal of Microscopy
|September 10, 2008
PubMed
Summary
This summary is machine-generated.

Plant and animal cells anchor the Ran GTPase-activating protein (RanGAP) to the nuclear envelope using distinct mechanisms. A novel protein family in Arabidopsis anchors RanGAP, suggesting separate evolutionary paths for RanGAP targeting.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Evolutionary Biology

Background:

  • Ran GTPase is crucial for nuclear transport, cell division, and nuclear envelope formation.
  • Ran GTPase-activating protein (RanGAP) localization is key to Ran GTPase function.
  • Vertebrate RanGAP1 targets the nuclear envelope and mitotic structures via specific domains.

Purpose of the Study:

  • To investigate the targeting mechanism of Arabidopsis RanGAP1 (AtRanGAP1).
  • To identify proteins responsible for anchoring AtRanGAP1 to the nuclear envelope.
  • To compare RanGAP anchoring strategies between plants and animals.

Main Methods:

  • Analysis of AtRanGAP1's plant-specific N-terminal WPP domain for targeting.
  • Identification of novel nuclear pore-associated proteins in Arabidopsis.
  • Investigating the role of these proteins in anchoring AtRanGAP1 at the root meristem.

Main Results:

  • AtRanGAP1 utilizes a plant-specific WPP domain for nuclear envelope targeting.
  • A novel family of plant-specific proteins is essential for anchoring AtRanGAP1.
  • AtRanGAP1 exhibits unique mitotic trafficking, including to the cell plate rim.

Conclusions:

  • Plants and animals employ fundamentally different mechanisms for anchoring RanGAP to the nuclear pore.
  • The WPP domain is necessary and sufficient for AtRanGAP1's interphase and mitotic targeting.
  • Findings suggest divergent evolution of RanGAP targeting, potentially linked to Ran gradient differences.