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Abstract
The sensitivity of a range of cellulases and xylanases to proteolytic inactivation was investigated. The xylanases, all the Clostridium thermocellum cellulases and cellulase E from Pseudomonas fluorescens subsp. cellulosa exhibited no decrease in catalytic activity during a 3-h incubation with proteinases of the small intestine. Under these conditions, the control Escherichia coli enzymes analysed had half-lives of 4.3-13.5 min. The addition of substrate significantly decreased the sensitivity of proteinase-labile enzymes to inactivation. The significance of these data in relation to the use of cellulases and xylanases for improving animal nutrition is discussed.
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