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Reef coral fluorescent proteins for visualizing fungal pathogens
Timothy M Bourett1, James A Sweigard, Kirk J Czymmek
1DuPont Crop Genetics, Experimental Station E402/2233, Powder Mill Road, Wilmington, DE 19880-0402, USA.
Fungal Genetics and Biology : FG & B
|November 15, 2002
Summary
Reef coral fluorescent proteins were successfully expressed in fungi, enabling detailed imaging of fungal pathogens like Fusarium verticillioides and Magnaporthe grisea without impacting their growth or virulence. This breakthrough allows for advanced study of fungal cell biology and disease mechanisms.
Area of Science:
- Molecular Biology
- Mycology
- Microscopy
Background:
- Fluorescent proteins are crucial tools for biological imaging.
- Reef coral fluorescent proteins offer novel spectral properties.
- Fungal pathogens pose significant threats to agriculture.
Purpose of the Study:
- To express reef coral fluorescent proteins in a heterologous fungal system.
- To evaluate their utility for imaging fungal plant pathogens.
- To assess their impact on fungal physiology and virulence.
Main Methods:
- Expression of AmCyan, ZsGreen, ZsYellow, and AsRed in Fusarium verticillioides and Magnaporthe grisea.
- Utilizing strong constitutive fungal promoters for protein expression.
- Confocal and multi-photon microscopy for subcellular localization and dynamics.
- In planta imaging using two-photon microscopy.
Main Results:
- Bright cytoplasmic fluorescence observed in both fungal species.
- No detectable effect on fungal growth rate or disease-causing ability.
- Differential intracellular localization enabled discrimination of subcellular organelles.
- Time-resolved in planta imaging achieved with AmCyan and ZsGreen.
Conclusions:
- Reef coral fluorescent proteins are effective tools for fungal imaging.
- These proteins do not interfere with fungal pathogen biology.
- Advanced microscopy techniques can reveal fungal organelle dynamics and nuclear envelope permeability.