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Updated: Feb 28, 2026
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In Vesiculo Synthesis of Peptide Membrane Precursors for Autonomous Vesicle Growth
Published on: June 28, 2019
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Structural Insights into Cell Wall-Related Vesicle Secretion with Different Mechanisms
Jiawen Yang1,2, Sheng Chang3, Linlin Li3
1Cryo-Electron Microscopy Center, Department of Biology, Southern University of Science and Technology, Shenzhen 518055, China.
Plants (Basel, Switzerland)
|February 27, 2026
Summary
Secretory vesicles bypass plasma membrane fusion in walled eukaryotes like plants and fungi. This study reveals unique exocytosis mechanisms enabling cargo delivery through rigid cell walls.
Area of Science:
- Cell Biology
- Plant Biology
- Mycology
Background:
- Exocytosis is vital for cellular transport in eukaryotes.
- Walled organisms (plants, fungi) face unique challenges for vesicular secretion due to rigid cell walls.
- The mechanism of vesicle transport across cell walls remains poorly understood.
Purpose of the Study:
- To investigate the structural mechanisms of cell wall-related exocytosis.
- To understand how walled eukaryotic cells secrete cargo.
- To elucidate the adaptations of vesicle secretion in constrained environments.
Main Methods:
- Transmission electron microscopy (TEM)
- Cryo-electron tomography (cryo-ET)
- Serial section electron tomography (SS-ET)
Main Results:
- Secretory vesicles do not fuse with the plasma membrane during cell wall secretion in *Arabidopsis thaliana* and *Saccharomyces cerevisiae*.
- Vesicles were observed within multivesicular body (MVB)-like structures in the cell wall of *A. thaliana* floral nectaries.
- Distinct structural pathways for vesicle secretion across cell walls were identified.
Conclusions:
- Walled eukaryotic cells employ specialized exocytosis pathways distinct from non-walled cells.
- These pathways facilitate cargo delivery despite the restrictive cell wall barrier.
- Findings expand the understanding of exocytosis in plants, fungi, and archaea.
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