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Nucleic Acids Research, 1982, Vol. 10, No. 16 5015-5031
© 1982

MOLECULAR BIOLOGY

Transcription initiation sites within an IS2 insertion in a Gal-constitutive mutant of Escherichia coli

Deborah M. Hinton and Richard E. Musso

Cancer Biology Program, Frederick Cancer Research Center Frederick, MD 21701, USA

Received October 28, 1981. Revised July 17, 1982. Accepted July 17, 1982.

Insertion of the insertion sequence IS2(I) directly before the galE gene of the galactose operon results in a Gal minus phenotype (1,2). The Gal-constitutive allele galc200 (and its deletion derivative galc200 {Delta}31) arise from such a Gal minus mutant by the insertion of IS2(II) DNA within the IS2(I) sequence (3). We have transcribed in vitro a DNA template representing the IS2-galE region of galc200{Delta}31. Gal-directed transcription initiates at two sites within the IS2 sequence, 51 and 52 bp from the IS2-galE junction. The promoter for these transcripts, Pgal200{Delta}3l is composed of a novel joint between a -10 region from the IS2(I) DNA and a -35 region contributed by the IS2(II) insertion. No promoters intrinsic to the 121 bp of the IS2(II) sequence also present on the template were detected. The relevance of Pgal200{Delta}3l to the Galc phenotype of galc200 and to general mechanisms for the constitutive expression of genes adjacent to IS2 is discussed.


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