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SLP1int (integrated [int] form of Streptomyces lividans plasmid 1 [SLP1]) is a Streptomyces coelicolor A3(2) transmissible sequence capable of autonomous replication as well as site-specific integration into and excision from the S. coelicolor chromosome. We report here that the plasmid and chromosomal loci involved in the integration of SLP1 and the two loci at which the recombination occurs during excision all share at least 111 base pairs of a 112-base-pair DNA sequence. Recombinational cross-over during integration or excision occurred nonrandomly within the common att sequence at or near a 25-base-pair inverted repeat. We suggest that chromosomally integrated plasmidogenic segments such as SLP1int may be involved in the acquisition and structural organization of genes encoding the diverse metabolic capabilities observed in different streptomycetes.

Structural analysis of plasmid and chromosomal loci involved in site-specific excision and integration of the SLP1 element of Streptomyces coelicolor