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Complex transcriptional control of the streptokinase gene of Streptococcus equisimilis H46A

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Abstract

On the Streptococcus equisimilis H46A chromosome, the divergent coding sequences of the genes for the plasminogen activator streptokinase (skc) and a leucine-rich protein (lrp), the function of which is unknown, are separated by a 328 by intrinsically bent DNA region rich in AT tracts. To begin to understand the expression control of these two genes, we mapped their transcriptional initiation sites by S1 nuclease analysis and studied the influence of the bent intergenic region on promoter strength, using promoter-reporter gene fusions of skc′ and lrp′ to ′lacZ from Escherichia coli. The major transcriptional start sites, in both S. equisimilis and E. coli, mapped 22 bases upstream of the ATG start site of lrp (G), and 24 and 32 bases upstream of the translational initiation codon of skc (A and G, respectively), indicating the existence of two overlapping canonical skc promoters arranged in tandem on opposite faces of the helix. The reporter gene fusions were cloned in E. coli on a vector containing a 1.1 kb fragment of the S. equisimilis dexB gene, thus allowing promoter strength to be measured in multiple plasmid-form copies in the heterologous host and in single-copy genomic form following integration into the skc region of the homologous host. In S. equisimilis, skc′-′lacZ was expressed about 200-fold more strongly than the corresponding lrp′-′lacZ fusion. In contrast, in E. coli, the corresponding levels of expression differed by only about 11-fold. Deletion of the 202 by bent region upstream of the skc and lrp core promoters caused a 13-fold decrease in skc promoter activity in S. equisimilis but did not alter lrp promoter strength in this host. In contrast, when studied in E. coli, this deletion did not alter the strength of the skc double promoter and even increased by 2.4- to 3-fold the activity of the lrp promoter. This comparative promoter analysis shows that skc has a complex promoter structure, the activity of which in the homologous genomic environment specifically depends on sequences upstream of the two core promoters. Thus, the skc promoter structure resembles that of an array of promoters involved in a transcriptional switch; however, the nature of the potential switch factor(s) remains unknown.

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  1. Institute for Molecular Biology, Jena University, Winzerlaer Straße 10, D-07745, Jena, Germany

    Klaus Gase, Thomas Ellinger & Horst Malke

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  1. Klaus Gase
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  2. Thomas Ellinger
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  3. Horst Malke
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Gase, K., Ellinger, T. & Malke, H. Complex transcriptional control of the streptokinase gene of Streptococcus equisimilis H46A. Molec. Gen. Genet. 247, 749–758 (1995). https://doi.org/10.1007/BF00290407

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