Xylanases
| Xylanases | ||
|---|---|---|
| Enzyme classification | ||
| EC, category | 3.2.1.8 , glycosidase | |
| Response type | Hydrolysis of (1 → 4) -β-D-xylose bonds in xylans | |
| Substrate | Xylans | |
| Products | β-D-xylose | |
| Occurrence | ||
| Parent taxon | Creature | |
| Exceptions | higher plants, vertebrates | |
Xylanases are enzymes from the group of pentosanases that can break down various substances ( xylans ) present in the supporting structure of the plant cell walls .
They occur naturally in bacteria , fungi , yeasts , protozoa , algae , xylophage insects , snails and crustaceans , but not in vertebrates (these digest these substances through their intestinal flora ). For industrial use, xylanases are often genetically engineered from fungi (e.g. Aspergillus and Trichoderma species ) and bacteria.
classification
Xylanases form the families 10 and 11 in the classification of glycosidases according to Henrissat.
use
They are used in starch processing (e.g. in bakeries to improve the properties of the dough), as feed additives (e.g. in poultry farming) and in the paper industry. Allergies to xylanases are known in this environment .
Individual evidence
- ↑ TransGen report on xylanase ( Memento of March 3, 2007 in the Internet Archive )
- ↑ Review of the evaluation of the product xylanase from genetically modified microorganisms (PDF; 255 kB)
- ↑ Bernard Henrissat: Glycosyl hydrolase families: classification and list of entries
- ↑ Extremophile Biotechnology
- ↑ V. van Kampen, R. Merget, T. Brüning: Occupational allergies to xylanases. In: Pneumology. 58, 2004, pp. 103-106, doi : 10.1055 / s-2003-812512 .