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Some characteristics of nystatin-resistant sterol mutants of Candida albicans
Abstract:
Various stable, auxotrophic and nystatin-resistant sterol mutants of Candida albicans were isolated after nitrosoguanidine treatment. Sterol mutants were divided into groups on the basis of the ultraviolet spectra and thin-layer chromatographic patterns of their nonsaponifiable sterol extracts. They were further characterized by their conductometrically measured nystatin-induced ion release. These sterol mutants displayed a decreased growth yield and an increased cell volume. On media containing 0.01% of the carbon sources, most of them could assimilate glycerol, alpha-methyl-D-glucoside, DL-lactic acid, L-sorbose, L-arabinose and ribitol only to a significantly reduced extent, or not at all. It is presumed that these properties result from the altered sterol composition of the plasma membrane.
Insights
Researchers created stable sterol mutants of Candida albicans using nitrosoguanidine. These mutants showed altered growth and assimilation, likely due to changes in their plasma membrane sterol composition.
Area of Science:
- Mycology
- Biochemistry
- Cell Biology
Background:
- Candida albicans is an opportunistic fungal pathogen.
- Sterols play crucial roles in fungal cell membrane integrity and function.
- Understanding sterol biosynthesis and its impact on fungal physiology is vital for developing antifungal strategies.
Purpose of the Study:
- To isolate and characterize stable sterol mutants of Candida albicans.
- To investigate the physiological and biochemical properties of these mutants.
- To elucidate the role of specific sterols in Candida albicans growth and membrane function.
Main Methods:
- Isolation of sterol mutants using nitrosoguanidine mutagenesis.
- Characterization of sterol composition via ultraviolet spectra and thin-layer chromatography.
- Assessment of nystatin-induced ion release using conductometry.
- Evaluation of growth yield, cell volume, and carbon source assimilation.
Main Results:
- Stable auxotrophic and nystatin-resistant sterol mutants of Candida albicans were successfully isolated.
- Mutants exhibited decreased growth yield and increased cell volume.
- Significant reduction or inability to assimilate various carbon sources (glycerol, alpha-methyl-D-glucoside, DL-lactic acid, L-sorbose, L-arabinose, ribitol) was observed.
- Nystatin sensitivity varied among mutants, correlating with sterol profiles.
Conclusions:
- The observed physiological alterations in Candida albicans sterol mutants are attributed to changes in plasma membrane sterol composition.
- Sterol composition significantly impacts fungal growth, cell morphology, and nutrient assimilation.
- These findings provide insights into sterol-dependent pathways in Candida albicans and potential targets for antifungal drug development.