The natural transformability of the soil bacterium sp. ADP1 (BD413UE), formerly classified as has facilitated previous physiological and biochemical investigations. In the present studies, the natural transformation system was exploited to generate a physical and genetic map of this strain's 3780·191 kbp circular chromosome. Previously isolated Acinetobacter genes were modified to incorporate a recognition sequence for the restriction endonuclease l. Following transformation of the wild-type strain by the modified DNA, homologous recombination placed each engineered l cleavage site at the chromosomal location of the corresponding gene. This allowed precise gene localization and orientation of more than 40 genes relative to a physical map which was constructed with transverse alternating field electrophoresis (TAFE) and Southern hybridization methods. The positions of l, l and l-l recognition sites were determined, and the latter enzyme identified the presence of seven ribosomal RNA operons. Multiple chromosomal copies of insertion sequence IS were indicated by hybridization. Several of these copies were concentrated in one region of the chromosome in which a spontaneous deletion of approximately 100 kbp occurred. Moreover, contrary to previous reports, ColE1-based plasmids appeared to replicate autonomously in sp. ADP1.


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