REGULATION OF XYLANASE ACTIVITY IN CELLULOMONAS SP IIBC

The regulation mechanism governing the xylanolytic activity in the strain Cellulomonas sp. IIbc was studied. High levels of activity were detected during the cultivation on cellulose as the only carbon source. No activity was produced with glucose, xylose or cellobiose cultures, but in the last one, the synthesis was de-repressed when the sugar concentration dropped to 0.2%. The activity was not inhibited by glucose, cellobiose and xylose up to 1% concentration. A basal constitutive synthesis was detected in nutrient broth cultures. At the same time, xylose and cellobiose acted as inducers of the xylanase activity.