The wide-domain carbon catabolite repressor CreA indirectly controls expression of the Aspergillus nidulans xlnB gene, encoding the acidic endo-beta-(1,4)-xylanase X(sub)24

Results show that although mutation in the wide-domain repressor CreA gene leads to an elevated levels of xlnB mRNA, none of the CreA consensus target sites are localized in the xlnB gene. Data suggest that the catabolite repression of the xlnB encoded xylanase is exerted in an indirect manner.