Differential Extraction of N-Acetylglucosaminidase and Trehalase from the Cell Envelope of Candida albicans |
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Institution: | 1. Department of Botany II, Julius-von-Sachs-Institute for Biological Sciences, University of Würzburg, Julius-von-Sachs-Platz 3, 97082 Würzburg, Germany;2. Eskitis Institute for Drug Discovery, Griffith University, Brisbane, QLD 4111, Australia;3. Department of Pharmacognosy, Faculty of Pharmacy, Minia University, 61519 Minia, Egypt |
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Abstract: | Molloy, C., Shepherd, M. G., and Sullivan, P. A. 1995. Differential extraction of N-acetylglucosaminidase and trehalase from the cell envelope of Candida albicans. Experimental Mycology 19, 178-185. Dithiothreitol (DTT) extraction of N-acetylglucosaminidase and trehalase from intact Candida albicans ATCC 10261 cells was monitored as an index of cell envelope porosity during N-acetylglucosamine-induced morphogenesis. Trehalase, which is secreted into the cell envelope during starvation and bud-formation, displayed similar extraction kinetics in starved, germ tube-forming, and bud-forming cells, indicating that the mother cell wall remains largely unchanged during morphogenic outgrowth and that the porosity of bud and mother cell walls is similar. N-acetylglucosaminidase, which is secreted specifically during morphogenesis, was released eightfold more rapidly from germ tube-forming than bud-forming cells, reflecting major differences in porosity between bud and germ tube. In addition, by assaying DTT extracts and extracted cell residues, it was found that the total extracellular N -acetylglucosaminidase activity increased 2- to 2.5-fold during DTT treatment. Thus, DTT unmasks a cryptic form of N-acetylglucosaminidase. The cryptic activity was associated with the cell wall fraction. |
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