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Performing the paradoxical: how plant peroxidases modify the cell wall
Filippo Passardi1, Claude Penel, Christophe Dunand
1Laboratory of Plant Physiology, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva 4, Switzerland.
Trends in Plant Science
|October 27, 2004
Summary
Class III peroxidases are a large plant gene family with diverse, sometimes opposing, roles in cell wall modification throughout a plant's life. Their functions are linked to distinct catalytic cycles involving hydrogen peroxide and reactive oxygen species.
Area of Science:
- Plant Biology
- Molecular Evolution
- Biochemistry
Background:
- Class III peroxidases ( ) constitute a large multigene family in plants, arising from extensive gene duplication during evolution.
- The precise functions of individual family members remain largely uncharacterized.
- Peroxidases are implicated in various plant processes, notably cell wall modification, with roles that can be context-dependent.
Purpose of the Study:
- To explore the evolutionary expansion and functional diversity of class III peroxidases.
- To understand the biochemical basis for the varied roles of peroxidases in plant life cycles.
Main Methods:
- Evolutionary analysis of gene duplication events.
- Biochemical characterization of peroxidase catalytic cycles.
- Investigation of reactive oxygen species metabolism in plants.
Main Results:
- Class III peroxidases have undergone significant expansion through gene duplication.
- Peroxidases exhibit dual catalytic cycles, influencing hydrogen peroxide and reactive oxygen species dynamics.
- These enzymes play critical, potentially antagonistic, roles in plant cell wall modifications.
Conclusions:
- The large number of class III peroxidase genes reflects their evolutionary importance.
- Peroxidase activity is central to plant development and adaptation via cell wall modulation.
- Understanding peroxidase mechanisms is key to deciphering plant growth and stress responses.