NDLI: Induction of cellulase and hemicellulase activities of Thermoascus aurantiacus by xylan hydrolyzed products.

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Induction of cellulase and hemicellulase activities of Thermoascus aurantiacus by xylan hydrolyzed products.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Brienzo, M. Monte, J. R. Milagres, A. M. F.
Description	Country affiliation: South Africa Author Affiliation: Brienzo M ( Department of Process Engineering, University of Stellenbosch, Private Box X1, Matielend, Stellenbosch, 7602, South Africa. brienzo@sun.ac.za)
Abstract	Thermoascus aurantiacus is able to secrete most of the hemicellulolytic and cellulolytic enzymes. To establish the xylanase inducers of T. aurantiacus, the mycelia were first grown on glucose up until the end of the exponential growth phase, followed by washing and re-suspension in a basal medium without a carbon source. Pre-weighed amounts of xylose (final concentration of 3.5 mg/ml), xylobiose (7 mg/ml) and hydrolyzed xylan from sugarcane bagasse (HXSB) which contained xylose, xylobiose and xylotriose (6.8 mg/ml) were evaluated as inducers of xylanase. It was observed that xylose did not suppress enzyme induction of T. aurantiacus when used in low concentrations, regardless of whether it was inoculated with xylobiose. Xylobiose promoted fast enzyme production stopping after 10 h, even at a low consumption rate of the carbon source; therefore xylobiose appears to be the natural inducer of xylanase. In HXSB only a negligible xylanase activity was determined. Xylose present in HXSB was consumed within the first 10 h while xylobiose was partially hydrolyzed at a slow rate. The profile of -arabinofuranosidase induction was very similar in media induced with xylobiose or HXSB, but induction with xylose showed some positive effects as well. The production profile for the xylanase was accompanied by low levels of cellulolytic activity. In comparison, growth in HXSB resulted in different profiles of both xylanase and cellulase production, excluding the possibility of xylanase acting as endoglucanases.
File Format	HTM / HTML
ISSN	09593993
Issue Number	1
Volume Number	28
e-ISSN	15730972
Journal	World Journal of Microbiology and Biotechnology
Language	English
Publisher	Springer
Publisher Date	2012-01-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biotechnology Research Support, Non-u.s. Gov't Discipline Microbiology Disaccharides Thermoascus Enzyme Induction Fungal Proteins Biosynthesis Biomass Metabolism Journal Article Discipline Biotechnology Hydrolysis Growth & Development Glycoside Hydrolases Cellulase Kinetics Enzymology Xylans
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Applied Microbiology and Biotechnology Biotechnology

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Induction of cellulase and hemicellulase activities of Thermoascus aurantiacus by xylan hydrolyzed products

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Induction of cellulase and hemicellulase activities of Thermoascus aurantiacus by xylan hydrolyzed products.

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