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A basic peroxidase from wheat kernel with antifungal activity.
C Caruso1, G Chilosi, L Leonardi
1Dipartimento di Agrobiologia e Agrochimica Università della Tuscia, Via S. Camillo De Lellis, I-01100, Viterbo, Italy. caruso@unitus.it
Phytochemistry
|October 24, 2001
Summary
A novel wheat heme-peroxidase (WP1) exhibits antifungal activity against plant pathogens. This discovery suggests peroxidases play a crucial role in plant defense mechanisms, offering potential for agricultural applications.
Area of Science:
- Biochemistry
- Plant Pathology
- Allergen Research
Background:
- Heme-peroxidases are enzymes involved in various biological processes.
- Wheat flour contains allergens implicated in baker's asthma.
- The specific functions of many plant peroxidases remain underexplored.
Purpose of the Study:
- To purify and characterize a basic heme-peroxidase (WP1) from wheat.
- To investigate the enzymatic and antifungal activities of WP1.
- To explore the potential role of peroxidases in plant defense.
Main Methods:
- Purification of WP1 from wheat kernels to homogeneity.
- Biochemical characterization including molecular mass and isoelectric point determination.
- Enzymatic assays for indole-3-acetic acid oxidase activity.
- In vitro antifungal assays against phytopathogenic fungi.
Main Results:
- WP1 was purified as a non-glycosylated 36 kDa protein with a pI of 8.0.
- WP1 demonstrated indole-3-acetic acid oxidase activity.
- WP1 significantly inhibited germ tube elongation in phytopathogenic fungi.
Conclusions:
- Wheat heme-peroxidase WP1 possesses significant antifungal properties.
- This study provides evidence for the defensive role of peroxidases in plants.
- WP1 may represent a novel target for managing plant fungal diseases.