Abstract
Using the previously established two-plasmid system for the identification of promoters recognized by a particular sigma factor, we identified two positive DNA fragments that were active only after inducedsigG, encoding σ factor σG ofStreptomyces coelicolor A3(2). High-resolution S1-nuclease mapping in theEscherichia coli two-plasmid system identified potential promoters, PG45 and PG54, whose sequences were similar to the consensus sequence ofBacillus subtilis promoters recognized by the general stress-response σ factor σB. However, both putative σG-dependent promoters were not active inS. coelicolor. Sequence analysis of the regions potentially governed by the promoters revealed a gene encoding a hypothetical protein SCO5555 and therrnE gene encoding rRNA operon. To confirm thatsigG encodes σ factor, the σG protein was overproduced inE. coli and purified. In anin vitro transcription assay, σG, after complementation withS. coelicolor core RNA polymerase, was able to recognize both σG-dependent promoters and initiate transcription.
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This work was supported by grant 2/3010/23 from theSlovak Academy of Sciences.
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Ševčíková, B., Mazuráková, V. & Kormanec, J. Characterization of the alternative sigma factor σG inStreptomyces coelicolor A3(2). Folia Microbiol 50, 47–58 (2005). https://doi.org/10.1007/BF02931293
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DOI: https://doi.org/10.1007/BF02931293