Abstract
The dnaA gene of Streptomyces lividans was cloned using the Escherichia coli medium-copy-number vector pSU18 and E. coli strain TC1963, which can bypass the requirement for the DnaA protein. Its regulatory region was subcloned in the Streptomyces probe vector pIJ4083. Primer extension and S1 mapping studies allowed the identification of a class I Streptomyces promotor (P2). An additional, previously unknown promoter type (P1) was found by S1 mapping. The presence of two DnaA box motifs between P1 and P2 suggests that the transcriptions of the S. lividans dnaA gene is autoregulated by its gene product. It was shown that the transcription of the dnaA gene is significantly induced by mitomycin C, an agent known to inhibit DNA replication. The data suggest that, as in E. coli, one of the regulatory mechanisms governing the transcription of the dnaA gene in S. lividans is probably related to the SOS response network.
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Zakrzewska-Czerwińska, J., Nardmann, J. & Schrempf, H. Inducible transcription of the dnaA gene from Streptomyces lividans 66. Molec. Gen. Genet. 242, 440–447 (1994). https://doi.org/10.1007/BF00281794
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DOI: https://doi.org/10.1007/BF00281794