Summary
Streptomyces ambofaciens strain ATCC23877 contains the 11.1 kb plasmid pSAM2 stably integrated into its chromosome. This plasmidic sequence is able to loop out and to be transferred at high frequency to S. lividans where it is found simultaneously as both free and integrated plasmid. When a UV derivative of strain ATCC23877 (strain ATCC15154) is used, the resident copy of pSAM2 can be transferred to S. lividans, but only the integrated form is found in this strain. In both cases, the integration occurs at a unique chromosomal region through the same plasmidic integration site as that in strain ATCC23877. The resident copy of strain ATCC15154 can also be transferred at low frequency to S. ambofaciens DSM40697 (devoid of any pSAM2 sequence). In this case, as several copies of pSAM2 are integrated, the integration pattern is complicated. Integration of a complete pSAM2 sequence in this strain occurs in a region that hybridizes with the integration zones of S. lividans and of S. ambofaciens strain ATCC23877. Comparison of the cloned integration zone of S. lividans before and after the integration event showed that the restriction pattern of the resident pSAM2 in strain ATCC15154 is similar to that of the free form of pSAM2 found naturally in another UV derivative of strain ATCC23877 (strain JI3212).
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Communicated by W. Gajewski
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Boccard, F., Pernodet, JL., Friedmann, A. et al. Site-specific integration of plasmid pSAM2 in Streptomyces lividans and S. ambofaciens . Mol Gen Genet 212, 432–439 (1988). https://doi.org/10.1007/BF00330847
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DOI: https://doi.org/10.1007/BF00330847