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Vacuolar processing enzyme: an executor of plant cell death
Ikuko Hara-Nishimura1, Noriyuki Hatsugai, Satoru Nakaune
1Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-850, Japan. ihnishi@gr.bot.kyoto-u.ac.jp
Current Opinion in Plant Biology
|June 9, 2005
Summary
Plant vacuolar processing enzyme (VPE) acts as a caspase, regulating cell death. VPE deficiency prevents plant cell death, suggesting a unique vacuole-mediated suicide strategy distinct from animal apoptosis.
Area of Science:
- Plant molecular biology
- Cellular biology
- Biochemistry
Background:
- Animal apoptosis is regulated by cytosolic caspases.
- Vacuolar processing enzyme (VPE) is a plant cysteine proteinase.
- VPE has been identified as a plant caspase.
Purpose of the Study:
- To investigate the role of VPE in plant cell death.
- To understand the mechanism of VPE-mediated cellular suicide in plants.
- To compare plant VPE-mediated cell death with animal apoptosis.
Main Methods:
- VPE deficiency analysis.
- Hypersensitive response studies.
- Embryogenesis cell death observation.
Main Results:
- VPE deficiency prevents cell death during hypersensitive response.
- VPE deficiency inhibits cell death in limited cell layers during early embryogenesis.
- VPE is localized in vacuoles, unlike animal caspases.
Conclusions:
- VPE plays a crucial role in regulating plant lytic systems for defense and development.
- Plants may utilize a unique, vacuole-mediated cellular suicide strategy involving VPE.
- This plant strategy differs from animal apoptosis, which is cytosol-mediated.