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Literature summary for 3.2.1.8 extracted from
- Purification and properties of two endo-1,4-beta-xylanases from Irpex lacteus (Polyporus tulipiferae) (1985), J. Biochem., 98, 1545-1554.
Inhibitors
| Inhibitors | Comment | Organism | Structure |
|---|---|---|---|
| Ag+ | AgNO3 | Irpex lacteus |  |
| Hg2+ | - |
Irpex lacteus | |
| Mn2+ | - |
Irpex lacteus | |
| Pb(CH3COO)2 | - |
Irpex lacteus | |
Metals/Ions
| Metals/Ions | Comment | Organism | Structure |
|---|---|---|---|
| Ca2+ | slight activation | Irpex lacteus | |
Molecular Weight [Da]
| Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
|---|---|---|---|
| 38000 | - |
gel filtration | Irpex lacteus |
| 62000 | - |
x * 62000, SDS-PAGE | Irpex lacteus |
Organism
| Organism | UniProt | Comment | Textmining |
|---|---|---|---|
| Irpex lacteus | - |
i.e. Polyporus tulipiferae | - |
Posttranslational Modification
| Posttranslational Modification | Comment | Organism |
|---|---|---|
| glycoprotein | xylanase I contains 2.5% carbohydrate, xylanase III contains 8.0% carbohydrate | Irpex lacteus |
Purification (Commentary)
| Purification (Comment) | Organism |
|---|---|
| xylanase I and III | Irpex lacteus |
Source Tissue
| Source Tissue | Comment | Organism | Textmining |
|---|
Specific Activity [micromol/min/mg]
| Specific Activity Minimum [µmol/min/mg] | Specific Activity Maximum [µmol/min/mg] | Comment | Organism |
|---|---|---|---|
| 8.25 | - |
xylanase III | Irpex lacteus |
| 11.94 | - |
xylanase I | Irpex lacteus |
Substrates and Products (Substrate)
| Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| 1,4-beta-D-xylan + H2O | larchwood xylan | Irpex lacteus | additional information | hyrolysis products formed by xylanase I are xylose, xylobiose and xylotriose. Xylobiose and xylotriose are the main products with xylanase III | ? | |
| pachyman + H2O | no activity | Irpex lacteus | ? | - |
? | |
| starch + H2O | no activity | Irpex lacteus | ? | - |
? | |
| xylobiose + H2O | no hydrolysis | Irpex lacteus | ? | - |
? | |
| xylotetraose + H2O | - |
Irpex lacteus | additional information | xylanase I produces xylobiose + xylose + xylotriose. Xylanase II produces only xylobiose in the early stage of reaction | ? | |
| xylotriose + H2O | hydrolyzed by xylanase I, no activity with xylanase III | Irpex lacteus | xylobiose + xylose | xylanase I | ? | |
Subunits
| Subunits | Comment | Organism |
|---|---|---|
| ? | x * 62000, SDS-PAGE | Irpex lacteus |
Temperature Optimum [°C]
| Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
|---|---|---|---|
| 60 | - |
xylanase I | Irpex lacteus |
| 70 | - |
xylanase III | Irpex lacteus |
Temperature Stability [°C]
| Temperature Stability Minimum [°C] | Temperature Stability Maximum [°C] | Comment | Organism |
|---|---|---|---|
| 60 | - |
pH 5.0, 10 min, stable up to | Irpex lacteus |
| 70 | - |
pH 5.0, 10 min, inactivated | Irpex lacteus |
pH Optimum
| pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
|---|---|---|---|
| 6 | - |
- |
Irpex lacteus |
pH Stability
| pH Stability | pH Stability Maximum | Comment | Organism |
|---|---|---|---|
| 5 | 7 | 30°C, 24 h, xylanase II is stable | Irpex lacteus |
| 5 | 10 | 30°C, 24 h, xylanase I is stable | Irpex lacteus |
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