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Updated: May 14, 2026
Microarray Analysis for Saccharomyces cerevisiae
Published on: April 7, 2011
Response to oxidative stress in Paracoccidioides yeast cells as determined by proteomic analysis
Daciene de Arruda Grossklaus1, Alexandre Melo Bailão, Tereza Cristina Vieira Rezende
1Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, ICBII, Campus II, Universidade Federal de Goiás, 74001-970 Goiânia, Goiás, Brazil.
Abstract:
An efficient oxidative stress response is important to the fungal pathogen Paracoccidioides to survive within the human host. In this study, oxidative stress was mimicked by exposure of yeast cells to hydrogen peroxide (2 mM H2O2). To investigate the effect of H2O2 on the proteome of Paracoccidioides, we used a large scale 2-DE protein gel electrophoresis approach to analyze differentially expressed proteins/isoforms that were detected in early (2 h) and in late (6 h) oxidative stress treatments. All proteins/isoforms were grouped based on their functional categories that revealed a global activation of antioxidant enzymes, such as catalase, superoxide dismutase, cytochrome C peroxidase and thioredoxin. A view of the metabolic cell profile, as determined by proteomics, depicted a shift in the yeast cells metabolism as suggested by the activation of the pentose phosphate pathway, a great source of cellular reducing power in the form of NADPH. Additionally, in silico analyzes depicted 34 oxidoreductases proteins/isoforms putatively involved with defense against oxidative stress. Confirmatory assays of enzymatic activity, flow cytometry, transcript levels and NADPH measurements, produced data in agreement with proteomic analysis.
Insights
Paracoccidioides fungi activate antioxidant enzymes and shift metabolism to combat oxidative stress. This response is crucial for survival within the human host, involving key enzymes and pathways like the pentose phosphate pathway.
Area of Science:
- Mycology
- Biochemistry
- Molecular Biology
Background:
- Fungal pathogens require robust oxidative stress response mechanisms to survive host defenses.
- Paracoccidioides is a significant human fungal pathogen where oxidative stress is a key survival factor.
Purpose of the Study:
- To investigate the proteomic changes in Paracoccidioides yeast cells under hydrogen peroxide-induced oxidative stress.
- To identify key antioxidant enzymes and metabolic shifts involved in the fungal oxidative stress response.
Main Methods:
- Proteomic analysis using 2-DE protein gel electrophoresis to compare protein expression at early (2h) and late (6h) stress stages.
- In silico analysis to identify oxidoreductases potentially involved in oxidative stress defense.
- Confirmatory assays including enzymatic activity, flow cytometry, transcript levels, and NADPH measurements.
Main Results:
- Global activation of antioxidant enzymes such as catalase, superoxide dismutase, and thioredoxin was observed.
- A metabolic shift towards the pentose phosphate pathway was indicated, increasing cellular reducing power (NADPH).
- Proteomics identified 34 putative oxidoreductases involved in oxidative stress defense, supported by confirmatory assays.
Conclusions:
- Paracoccidioides mounts a comprehensive oxidative stress response involving enhanced antioxidant enzyme activity and metabolic reprogramming.
- The pentose phosphate pathway plays a critical role in providing NADPH for combating oxidative damage.
- These findings provide insights into fungal survival strategies and potential therapeutic targets.
