Integrative transformation of Aspergillus oryzae with a plasmid containing the Aspergillus nidulans argB gene.
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The transformation of Aspergillus oryzae has been achieved with a plasmid carrying the Aspergillus nidulans argB gene coding for ornithine carbamoyltransferase (OCTase). The frequency of transformation was relatively low (0.7 transformants/μg DNA) but the transformed phenotype was extremely stable for many generations without selective pressure. Southern blot analysis revealed that transformation had occurred by integration of multiple tandem copies of plasmid DNA into the host genome through non-homologous recombination. There was no evidence of the existence of free plasmid in the transformants. The number of integrated copies of the plasmid ranged from 15 to 60. The specific activity of OCTase in the cellfree extract was proportional to the copy number of the plasmid, indicating that most of the integrated argB gene was expressed.
- 公益社団法人 日本農芸化学会の論文
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