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Rab Proteins01:14

Rab Proteins

4.1K
Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
4.1K
Rab Cascades01:25

Rab Cascades

2.7K
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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Cell Signaling in Plants01:25

Cell Signaling in Plants

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Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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Related Experiment Video

Updated: Sep 10, 2025

A Method for Characterizing Embryogenesis in Arabidopsis
10:24

A Method for Characterizing Embryogenesis in Arabidopsis

Published on: August 4, 2017

11.3K

Arabidopsis RabGDIs mediate Rab targeting and are crucial for male gametophytic function.

Ya-Nan Wu1, Gui-Min Yin1, Fei Yu2

  • 1Frontiers Science Center for Cell Responses, College of Life Sciences, Nankai University, Tianjin, 300071, China.

The New Phytologist
|August 25, 2025
PubMed
Summary

Arabidopsis RabGDIs are essential for male fertility, regulating pollen development and growth. Their loss disrupts Rab GTPase targeting in plant cells, impacting essential trafficking pathways.

Keywords:
cell polaritypollen germinationpollen tube growthsecretionvacuolar trafficking

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Area of Science:

  • Plant molecular biology
  • Cellular trafficking mechanisms
  • Reproductive biology

Background:

  • Rab GTPases regulate vesicular transport by cycling between membrane compartments.
  • Rab guanine nucleotide dissociation inhibitors (RabGDIs) modulate Rab GTPase activity and localization.
  • The function of RabGDIs in plants, particularly in male fertility, remains largely uncharacterized.

Purpose of the Study:

  • To investigate the role of RabGDIs in Arabidopsis thaliana.
  • To determine the impact of RabGDI loss on male fertility and pollen development.
  • To elucidate the function of RabGDIs in regulating Rab GTPase trafficking in plants.

Main Methods:

  • Reverse genetics to generate Arabidopsis mutants lacking functional RabGDIs.
  • Analysis of pollen development, germination, and pollen tube growth.
  • Cellular and pharmacological approaches to track Rab GTPase localization.

Main Results:

  • Arabidopsis RabGDIs redundantly control male fertility.
  • Loss of RabGDIs leads to compromised pollen development, germination, and pollen tube directional growth.
  • RabGDIs are crucial for targeting Rab GTPases in both secretory and vacuolar pathways.
  • Vacuolar trafficking regulators (Rab5, Rab7) are mis-targeted in pollen tubes lacking RabGDIs.

Conclusions:

  • Arabidopsis RabGDIs are essential for male fertility by ensuring proper Rab GTPase localization.
  • RabGDIs play a critical role in regulating vesicular trafficking pathways, including secretory and vacuolar transport.
  • A phylum-specific role for RabGDIs in the initial targeting of Rab GTPases to their donor membranes is suggested.