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The insertion of an XhoI linker 30 bp from the 5' end of the RNA II primer for ColE1 plasmid replication has allowed us to replace the natural RNA II promoter by other controllable promoters, in particular lambda pL. Manipulation of this modified origin was facilitated by constructing dual-origin plasmids, stable maintenance being directed by the pSC101 origin. Experiments showed that such dual-origin plasmids could be stably maintained at approximately four copies per chromosome at 30 degrees C and readily amplified by thermal induction of strains carrying a thermolabile lambda repressor. The use of such plasmids for the construction of stable, amplifiable expression vectors is discussed.
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