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Updated: Jul 11, 2025

Bio-energetics Investigation of Candida albicans Using Real-time Extracellular Flux Analysis
Published on: March 19, 2019
Proline catabolism is a key factor facilitating Candida albicans pathogenicity.
Fitz Gerald S Silao1, Tong Jiang2, Biborka Bereczky-Veress3
1Department of Molecular Biosciences, The Wenner-Gren Institute, Science for Life Laboratory, Stockholm University, Solna, Sweden.
Candida albicans uses proline for energy and growth. Disrupting proline utilization genes impairs its virulence and ability to switch forms, highlighting proline metabolism
Area of Science:
- Medical Mycology
- Molecular Biology
- Pathogen Metabolism
Background:
- Candida albicans is a primary cause of human fungal infections (mycoses).
- This fungus utilizes proline for energy, growth, and morphological switching (yeast to hyphal forms).
Purpose of the Study:
- To investigate the role of proline utilization (UT) genes in Candida albicans virulence.
- To understand the impact of proline metabolism defects on fungal pathogenesis and host interactions.
Main Methods:
- Genetic manipulation of proline utilization genes (put1-/-, put2-/-).
- Assessment of proline sensitivity and pyrroline-5-carboxylate (P5C) accumulation.
- Evaluation of virulence in Drosophila and murine candidemia models.
- Analysis of fungal survival in human neutrophils and whole blood.
- Real-time imaging of kidney infection using intravital 2-photon and non-linear microscopy.
Main Results:
- put1-/- and put2-/- mutants showed proline sensitivity, with put2-/- being hypersensitive due to toxic P5C accumulation inhibiting respiration.
- These mutations significantly attenuated virulence in both insect and mammalian models.
- Defective proline utilization decreased fungal survival in human immune cells and blood.
- In vivo imaging revealed impaired morphological switching in put2-/- mutants during kidney infection.
- Proline catabolism is crucial for Candida species, including C. auris, to thrive.
Conclusions:
- Proline utilization is essential for Candida albicans virulence and adaptation within the host.
- Defects in proline metabolism, particularly P5C accumulation, compromise fungal fitness and pathogenicity.
- Targeting proline metabolic pathways could be a novel strategy against Candida infections.
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