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- W2079128751 abstract "In the plasmid pUC8ksgA7, the coding region of the ksgA gene is preceded by the lac promoter (Plac) and a small open reading frame (ORF). This ORF of 15 codons is composed of nucleotides derived from the lacZ gene, a multiple cloning site and the ksgA gene itself. The reading frame begins with the ATG initiation codon of lacZ and ends a few nucleotides beyond the ATG start codon of ksgA. The ksgA gene is not preceded by a Shine-Dalgarno (SD) signal. Cells transformed with pUC8ksgA7 produce active methylase, the product of the ksgA gene. Introduction of an in-phase TAA stop codon in the small ORF abolishes methylase production in transformed cells. On the plasmid pUC8ksgA5, which contains the entire ksgA region, the promoter of the ksgA gene was found to reside in a 380 base pair Bgl1-Pvu2 restriction fragment, partly overlapping the ksgA gene, by two independent methods. Cloning of this fragment in front of the galK gene in plasmid pKO1 stimulates galactokinase activity in transformants and its insertion into the expression vector pKL203 makes beta-galactosidase synthesis independent of the presence of Plac. The sequence of the Bgl1-Pvu2 fragment was determined and a putative promoter sequence identified. An SD signal could not be distinguished at a proper distance upstream from the ksgA start codon. Instead, an ORF of 13 codons starting with ATG in tandem with an SD signal and ending 4 codons ahead of the ksgA gene was identified. This suggests that translation of the ORF is required for expression of the ksgA gene.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2079128751 date "1987-08-01" @default.
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- W2079128751 title "Characterization of the ksgA gene of Escherichia coli determining kasugamycin sensitivity" @default.
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- W2079128751 doi "https://doi.org/10.1016/0300-9084(87)90210-0" @default.
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