Abstract
Summary: Chitin synthase (EC 2.4.1.16) from membrane preparations of Aspergillus nidulans was characterized and the optimum conditions for enzyme activity were determined. A reaction velocity-substrate concentration plot was sigmoidal, but was hyperbolic in the presence of N-acetylglucosamine when the K m for UDP-N-acetylglucosamine was 3·1 mmol 1−1. Chitin synthase activity could be increased sixfold by digestion of enzyme preparations with trypsin for short periods. The trypsin-activated enzyme had altered kinetic and storage properties.
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