Major secreted chitinase involved in the degradation of chitin, a component of the cell walls of fungi and exoskeletal elements of some animals (including worms and arthropods). Plays a role in the morphogenesis and autolysis (By similarity). Random endo-hydrolysis of N-acetyl-beta-D-glucosaminide (1->4)-beta-linkages in chitin and chitodextrins. Methylxanthine drugs surch as theophylline, caffeine and pentoxifylline, as well as the two cyclic peptide natural products argifin and argadin, act as specific inhibitors. Optimum pH is 5.0-7.0. Optimum temperature is 60 degrees Celsius. Induced during batch culture. Decreases the level of chitinase activity during the autolytic phase of batch cultures. Belongs to the glycosyl hydrolase 18 family. Chitinase class V subfamily.