Construction of a low-serine-type-carboxypeptidase-producing mutant of Aspergillus oryzae by the expression of antisense RNA and its use as a host for heterologous protein secretion.

Abstract excerpt

Using an antisense control strategy, we isolated an Aspergillus oryzae mutant that produced low levels of carboxypeptidases (CPases). The mutant TFC-1 expressed the antisense RNA of the structural gene of CPase O and showed about 30% of the CPase activity in the parent strain. Gel filtration analysis indicated that this mutant decreased the CPase activities not only of CPase O but also of CPase O-1 and O-2. This...

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