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Transformation of Bifidobacterium longum with pRM2, a constructed Escherichia coli-B. longum shuttle vector.

An Escherichia coli-Bifidobacterium longum shuttle vector, designated pRM2, was constructed by cloning a B. longum plasmid and an enterococcal spectinomycin resistance gene into a commercial E. coli vector. The plasmid was successfully introduced into B. longum cells by electroporation and into E. coli cells by both electroporation and chemical transformation.