Physiological studies on xylose induction and glucose repression of xylanolytic enzymes in Aspergillus sydowii MG49 |
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Authors: | Mousumi Ghosh Geeta Nanda |
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Affiliation: | Department of Microbiology, Bose Institute, P-1/12, C.I.T. Scheme, VIIM, Calcutta 700 054, India |
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Abstract: | Abstract Synthesis of extracellular xylanase and intracellular β-xylosidase in Aspergillus sydowii is induced in the presence of both d- and l-xylose in addition to xylobiose and β-d-methyl xyloside. Glucose exhibits a transient catabolite repression which can be partially overcome by external addition of 100 μM dibutyryl 3',5'-cAMP but not by that of cAMP itself. In the presence of xylose or other inducers this cyclic nucleotide stimulates the rate of xylanolytic enzyme synthesis by 85% and 129% for xylanase and β-xylosidase, respectively. |
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Keywords: | Xylanase β-Xylosidase Aspergillus sydowii |
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