Summary
A promoter-probe system, based on the ampC β-lactamase gene of Escherichia coli, has been developed for the isolation and characterization of transcriptional signals in the gram-positive bacterium Streptomyces lividans. The promoter-probe vector, denoted pJAS14, has the SLP1.2 replicon with a copy number of four-five plasmids per cell. It contains a unique BamHI site just in front of the ampC ribosome-binding site, and upstream of this BamHI site a transcriptional terminator signal that prevents readthrough transcription from plasmid-borne promoters has been inserted. Using pJAS14, we have shot-gun cloned chromosomal DNA from S. lividans and S. lavendulae into the BamHI site, and isolated a number of promoter containing DNA fragments by the use of the chromogenic cephalosporin nitrocefin. On plates, we identified promoters of varying strengths and also with differences in nutritional and temporal expression. Using liquid cultures of S. lividans, it has been demonstrated that one promoter, denoted P1 (SEP8), as well as the ampC gene of E. coli, show activity corresponding to the vegetative growth of the cells. The P1 (SEP8) promoter was shown to be expressed also in E. coli, and it initiates RNA synthesis at exactly the same nucleotides in both S. lividans and E. coli. The promoter shows good homology to the E. coli promoter consensus sequence in both the-35 and-10 regions. Thus, this promoter is a representative of the SEP (Streptomyces E. coli-type promoter) class of promoters recently described (Jaurin and Cohen 1985). This indicates that an S. lividans RNA polymerase recognizes the same sequence determinants and chooses the point of initiation of RNA synthesis in the same way as the corresponding E. coli enzyme.
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Communicated by W. Goebel
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Forsman, M., Jaurin, B. Chromogenic identification of promoters in Streptomyces lividans by using an ampC β-lactamase promoter-probe vector. Mol Gen Genet 210, 23–32 (1987). https://doi.org/10.1007/BF00337754
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DOI: https://doi.org/10.1007/BF00337754