Journal
CURRENT MICROBIOLOGY
Volume 48, Issue 2, Pages 102-107Publisher
SPRINGER
DOI: 10.1007/s00284-003-4063-z
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For a long time, fungi have been characterized by their ability to secrete enzymes, mostly hydrolytic in function, and thus are defined as extracellular degraders. Chitin and chitinolytic enzymes are gaining importance for their biotechnological applications. Particularly, chitinases are used in agriculture to control plant pathogens. Metarhizium anisopliae produces an extracellular chitinase when grown on a medium containing chitin, indicating that synthesis is subject to induction by the substrate. Various sugar combinations were investigated for induction and repression of chitinase. N-acetylglucosamine (GIcNAc) shows a special dual regulation on chitinase production. M. anisopliae has at least two distinct, cell-bound, chitinolytic enzymes when cultured with GIcNAc as one of the carbon sources, and we suggest that this carbohydrate has an important role in protein secretion.
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