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Glucanase

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Glucanases are enzymes that break down a glucan, a polysaccharide made of several glucose sub-units. As they perform hydrolysis of the glucosidic bond, they are hydrolases.

Contents

Used in enological practices during the aging process of wine, particularly when aged on lees with microxygenation. The enzyme aids in autolysis of yeast cells to release polysaccharides and mannoproteins, which is believed to aid in the color and texture of the wine.

α-glucanases

  • α-1,4-glucanase, an enzyme that breaks down α-1,4-glucans
  • α-1,6-glucanase, an enzyme that breaks down α-1,6-glucans
  • Pullulanase, a specific kind of glucanase that degrade pullulan

    • β-glucanases

  • β-1,3-glucanase, an enzyme that breaks down β-1,3-glucans such as callose or curdlan
  • β-1,6 glucanase, an enzyme that breaks down β-1,6-glucans
  • Cellulase, an enzyme that perform the hydrolysis of 1,4-beta-D-glucosidic linkages in cellulose, lichenin and cereal β-D-glucans.
  • Xyloglucan-specific endo-beta-1,4-glucanase
  • Xyloglucan-specific exo-beta-1,4-glucanase

    • Occurrences

    Glucanases can be produced by Neocallimastigomycota, a phylum of anaerobic fungi found in the digestive tracts of herbivores.

    References

    Glucanase Wikipedia
    (Text) CC BY-SA