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Translating Ribosome Affinity Purification TRAP to Investigate Arabidopsis thaliana Root Development at a Cell Type-Specific Scale
Published on: May 14, 2020
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Arabidopsis pavement cell shape formation involves spatially confined ROPGAP regulators
Theresa Lauster1, Dorothee Stöckle1, Katharina Gabor1
1University of Tübingen, ZMBP, Auf der Morgenstelle 32, 72076 Tübingen, Germany.
Current Biology : CB
|January 27, 2022
Summary
PLECKSTRIN HOMOLOGY GTPase ACTIVATING PROTEINS (PHGAPs) are crucial for plant pavement cell shape. These proteins regulate Rho-related GTPases from plants (ROPs), ensuring proper cell growth and multipolarity in Arabidopsis epidermal cells.
Area of Science:
- Plant Biology
- Cell Biology
- Developmental Biology
Background:
- Pavement cell development involves coordinated lobe and indentation formation, essential for plant morphology.
- Rho-related GTPases from plants (ROPs) are involved in polarity signaling, but their spatiotemporal regulation in pavement cell development is not fully understood.
Purpose of the Study:
- To investigate the role of PLECKSTRIN HOMOLOGY GTPase ACTIVATING PROTEINS (PHGAPs) in the multipolar growth and shape establishment of Arabidopsis pavement cells.
- To elucidate the interaction and localization of PHGAPs in relation to ROP signaling during pavement cell development.
Main Methods:
- Analysis of phgap1phgap2 double mutants in Arabidopsis.
- Microscopic observation of pavement cell shape and localization of PHGAPs.
- Investigation of PHGAP interaction with ROP2 and microtubule dependence.
Main Results:
- Loss of function in phgap1phgap2 mutants resulted in severely altered pavement cell shapes.
- PHGAPs were found to interact with ROP2 and localize to specific regions of pavement cell indentations.
- PHGAP localization was microtubule-dependent and established early in development, persisting through cell expansion.
Conclusions:
- PHGAP1/REN2 and PHGAP2/REN3 are critical regulators of ROP2 activity gradients during pavement cell development.
- Precise, localized control of ROP activity by PHGAPs is essential for establishing multipolarity in plant epidermal cells.
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