Development of a transformation system forTrichoderma longibrachiatum and its use for constructing multicopy transformants for theegl1 gene
An efficient transformation system for the fungusTrichoderma longibrachiatum has been developed. Transformation was obtained both by electroporation and polyethyleneglycol treatment, using a plasmid carrying theEscherichia coli hygromycin B phosphotransferase gene as a dominant selectable marker. The transformation frequency was 0.5 to 5 transformants /g plasmid DNA. Transformation normally occurred by tandem integration of the transforming DNA. A high percentage of the transformants were mitotically unstable. The efficiency of co-transformation was very high (around 90%), and several co-transformants containing multiple copies of theegll gene encoding a -(1,4)-endoglucanase were obtained. Some of them secrete increased levels of endoglucanase to the culture medium. In addition, theE. coli lacZ gene was expressed in an active form under control of theAspergillus nidulans gpdA gene promoter
| Main Authors: | , , , , |
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| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Springer
1994
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| Subjects: | Trichoderma Iongibrachiatum, |
| Online Access: | http://hdl.handle.net/10261/41661 |
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