Summary
Replication of the Streptomyces ghanaensis plasmid pSG5 was shown to be temperature sensitive. The pSG5 replicon is stably inherited at temperatures below 34° C, but is lost at incubation temperatures above this. A family of cloning vectors was constructed using the pSG5 minimal replicon and different marker genes. The vectors obtained are small in size, have an intermediate copy number, possess a broad host range and are compatible with some other streptomycete vector systems. By increasing the incubation temperature, these vectors can be eliminated from their host cells very efficiently. The suitability of the pSG5 vector family for mutating chromosomal genes by gene disruption was demonstrated: pBN10, a pSG5 derivative containing an internal fragment of the phosphinothricyl-alanyl-alanine (PTT) resistance gene pat, was integrated into the chromosomal pat gene of the PTT-producer Streptomyces viridochromogenes thus inactivating PTT resistance. The integrated pBN10 plasmid was rescued from the chromosome, together with an adjacent fragment carrying DNA of the PTT biosynthetic cluster.
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Communicated by J.W. Lengeler
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Muth, G., Nußbaumer, B., Wohlleben, W. et al. A vector system with temperature-sensitive replication for gene disruption and mutational cloning in streptomycetes. Mol Gen Genet 219, 341–348 (1989). https://doi.org/10.1007/BF00259605
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DOI: https://doi.org/10.1007/BF00259605