| IED ID | IndEnz0008000450 |
| Enzyme Type ID | cellulase000450 |
| Protein Name |
Endo-1,4-beta-xylanase B Xylanase B EC 3.2.1.8 1,4-beta-D-xylan xylanohydrolase B Endo-1,4-beta-xylanase G1 Xylanase G1 Endo-1,4-beta-xylanase II Xylanase II |
| Gene Name | xlnB xyn2 xynB xynG1 |
| Organism | Aspergillus niger |
| Taxonomic Lineage | cellular organisms Eukaryota Opisthokonta Fungi Dikarya Ascomycota saccharomyceta Pezizomycotina leotiomyceta Eurotiomycetes Eurotiomycetidae Eurotiales (green and blue molds) Aspergillaceae Aspergillus Aspergillus subgen. Circumdati Aspergillus niger |
| Enzyme Sequence | MLTKNLLLCFAAAKAALAVPHDSVAQRSDALHMLSERSTPSSTGENNGFYYSFWTDGGGDVTYTNGDAGAYTVEWSNVGNFVGGKGWNPGSAQDITYSGTFTPSGNGYLSVYGWTTDPLIEYYIVESYGDYNPGSGGTYKGTVTSDGSVYDIYTATRTNAASIQGTATFTQYWSVRQNKRVGGTVTTSNHFNAWAKLGMNLGTHNYQIVATEGYQSSGSSSITVQ |
| Enzyme Length | 225 |
| Uniprot Accession Number | P55330 |
| Absorption | |
| Active Site | ACT_SITE 121; /note=Nucleophile; /evidence=ECO:0000255|PROSITE-ProRule:PRU10062; ACT_SITE 212; /note=Proton donor; /evidence=ECO:0000255|PROSITE-ProRule:PRU10063 |
| Activity Regulation | ACTIVITY REGULATION: Metal ions, copper, iron and N-bromosuccinimide decrease enzyme activity. Manganese, calcium, L-tryptophan, beta-mercaptoethanol, L-cysteine and dithiodipyridine stimulate the enzyme activity. {ECO:0000269|Ref.4}. |
| Binding Site | |
| Calcium Binding | |
| catalytic Activity | CATALYTIC ACTIVITY: Reaction=Endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans.; EC=3.2.1.8; |
| DNA Binding | |
| EC Number | 3.2.1.8 |
| Enzyme Function | FUNCTION: Endo-1,4-beta-xylanase involved in the hydrolysis of xylan, a major structural heterogeneous polysaccharide found in plant biomass representing the second most abundant polysaccharide in the biosphere, after cellulose. {ECO:0000250, ECO:0000269|Ref.4, ECO:0000269|Ref.5}. |
| Temperature Dependency | BIOPHYSICOCHEMICAL PROPERTIES: Temperature dependence: Optimum temperature is 50 degrees Celsius. Displays about 95 percent of peak activity in the temperature range from 37 to 41 degrees Celsius. {ECO:0000269|Ref.4, ECO:0000269|Ref.5}; |
| PH Dependency | BIOPHYSICOCHEMICAL PROPERTIES: pH dependence: Optimum pH is 5.0. Retains about 76 percent of its activity after being incubated at pH 2.0 for 30 min at 37 degrees Celsius. {ECO:0000269|Ref.4, ECO:0000269|Ref.5}; |
| Pathway | PATHWAY: Glycan degradation; xylan degradation. |
| nucleotide Binding | |
| Features | Active site (2); Chain (1); Domain (1); Propeptide (1); Sequence conflict (22); Signal peptide (1) |
| Keywords | Carbohydrate metabolism;Glycosidase;Hydrolase;Polysaccharide degradation;Secreted;Signal;Xylan degradation |
| Interact With | |
| Induction | |
| Subcellular Location | SUBCELLULAR LOCATION: Secreted {ECO:0000250}. |
| Modified Residue | |
| Post Translational Modification | |
| Signal Peptide | SIGNAL 1..18; /evidence=ECO:0000255 |
| Structure 3D | |
| Cross Reference PDB | - |
| Mapped Pubmed ID | - |
| Motif | |
| Gene Encoded By | |
| Mass | 24,057 |
| Kinetics | |
| Metal Binding | |
| Rhea ID | |
| Cross Reference Brenda |