Construction of cloning vectors for Bacillus thuringiensis
1991
Arantes, O. | Lereclus, D.
The replication region of the Bacillus thuringiensis plasmid, pHT1030, was treated with hydroxylamine. Various copy-number mutants were selected and subsequently used to construct shuttle vectors with multiple cloning sites. These recombinant plasmids are very stable and allowed the cloning of a delta-endotoxin-encoding gene in B. thuringiensis. Comparison between gene expression level and vector copy-number indicated that a plateau in delta-endotoxin production is reached with a copy-number of about fifteen per equivalent chromosome.
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