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Characterization of the Penicillium chrysogenum antifungal protein PAF
Lydia Kaiserer1, Christoph Oberparleiter, Renate Weiler-Görz
1Department of Molecular Biology, University of Innsbruck, Fritz-Pregl Strasse 3, 6020, Innsbruck, Austria.
Abstract:
The filamentous fungus Penicillium chrysogenum abundantly secretes the small, highly basic and cysteine-rich protein PAF ( Penicillium antifungal protein). In this study, the antifungal activity of PAF is described. PAF inhibited the growth of a variety of filamentous fungi, including opportunistic human pathogenic and phytopathogenic fungi, whereas bacterial and yeast cells were unaffected. PAF reduced the conidial germination and hyphal extension rates in a dose-dependent manner and induced severe changes in cell morphology that resulted in crippled and distorted hyphae and atypical branching. Growth-affected hyphae suffered from oxidative stress, plasma membrane leakage, and metabolic inactivity, which points to an induction of multifactorial effects in sensitive fungi. In contrast to other known antifungal proteins, the effects of PAF were only partially antagonized by cations.
Insights
Penicillium antifungal protein (PAF) effectively inhibits filamentous fungi, including human and plant pathogens. This protein causes significant cellular damage, leading to fungal growth inhibition.
Area of Science:
- Mycology
- Biochemistry
- Protein Science
Background:
- Penicillium chrysogenum secretes Penicillium antifungal protein (PAF), a small, basic, cysteine-rich protein.
- Antifungal proteins are crucial in host defense and have therapeutic potential.
Purpose of the Study:
- To characterize the antifungal activity and mechanism of action of Penicillium chrysogenum antifungal protein (PAF).
- To evaluate PAF's efficacy against various fungal species, including pathogenic ones.
Main Methods:
- Assessing PAF's inhibitory effects on fungal growth, conidial germination, and hyphal extension.
- Microscopic analysis of morphological changes in PAF-treated fungi.
- Investigating the impact of PAF on fungal cell integrity and metabolism.
Main Results:
- PAF demonstrated potent inhibition against a broad spectrum of filamentous fungi, including human opportunistic and phytopathogenic species.
- Bacterial and yeast cells were not affected by PAF.
- PAF treatment led to dose-dependent reductions in germination and hyphal growth, inducing severe morphological defects like distorted hyphae and atypical branching.
- Affected hyphae exhibited oxidative stress, plasma membrane leakage, and metabolic inactivity, indicating multifactorial cellular damage.
- PAF's antifungal effects were only partially counteracted by cations, unlike other known antifungal proteins.
Conclusions:
- Penicillium chrysogenum antifungal protein (PAF) is a potent inhibitor of filamentous fungi with a broad spectrum of activity.
- PAF induces multifactorial cellular damage, including membrane leakage and metabolic disruption.
- PAF's unique cation-independent activity suggests novel therapeutic applications in combating fungal infections.