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