Trichoderma harzianum strain P1 produces a variety of chitinolytic enzymes including N-acetyl-β-D-glucosaminidases, chitin 1,4-β-chitobiosidases, and an endochitinase. Chitabiosidases and an endochitinase were purified from dialyzed, concentrated culture filtrates using gel filtration, chromatofocusing, and isoelectric focusing. Three protein bands were evident in the purified chitobiosidase preparation, representing different levels of N-glycosylation of the same protein. The pI of all purified proteins was ∼3.9 []
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Gary E. Harman (1993) studied this question.