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. Endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans. Optimum pH is 5.5. Retain 85 percent of its activity in the pH range from 6.0 to 7.0 after a 12 h incubation at 25 degrees Celsius. Optimum temperature is 58 degrees Celsius. The purified enzyme showed complete stability under 60 degrees Celsius. Glycan degradation; xylan degradation. The promoter does not contain any 5'-GGCTAAA-3' sequence identified as binding sites for the xylanolytic transcriptional activator xlnR. Belongs to the glycosyl hydrolase 10 (cellulase F) family.