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[Yeast capsule ultrastructure]

S A Gulevskaia, V I Golubev, A R Manukian

    Mikrobiologiia
    |January 1, 1981
    PubMed
    Summary

    Yeast capsules, composed of fibrils, exhibit distinct structures across different yeast types. These findings suggest yeast capsules function as individual organelles, separate from the cell wall.

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    Area of Science:

    • Mycology
    • Cell Biology
    • Biochemistry

    Background:

    • Yeast capsules are extracellular polysaccharide layers surrounding the cell.
    • The precise ultrastructure and cellular origin of yeast capsules remain areas of investigation.

    Purpose of the Study:

    • To investigate and compare the ultrastructure of yeast capsules across diverse yeast species.
    • To determine if yeast capsules should be classified as part of the cell wall or as distinct organelles.

    Main Methods:

    • Ultrathin sectioning of yeast cells.
    • Microscopic examination of capsule ultrastructure in 12 yeast species.

    Main Results:

    • Capsules in all studied yeasts are formed by fibrils originating from the cell wall.
    • Ascomycetous yeasts exhibit parallel fibril orientation, while basidiomycetous yeasts show interwoven fibrils and peripheral thickening.
    • A distinct halo zone is often observed in basidiomycetous yeasts.

    Conclusions:

    • Significant structural differences exist between yeast capsules and cell walls.
    • Yeast capsules can be considered individual organelles, distinct from the cell wall.

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