Open AccessPhysiological studies on xylose induction and glucose repression of xylanolytic enzymes in Aspergillus sydowii MG49
Author(s) -
Ghosh Mousumi,
Nanda Geeta
Publication year - 1994
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1994.tb06757.x
Subject(s) - catabolite repression , xylose , xylobiose , xylanase , biochemistry , enzyme , fed batch culture , extracellular , chemistry , biology , fermentation , gene , mutant
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.