The structure of the promoter and amino terminal region of the ph 2.5 acid phosphatase structural gene app a of escherichia coli a negative control of transcription mediated by cyclic amp

Touati, E.; Danchin, A.

Biochimie 69(3): 215-222


ISSN/ISBN: 0300-9084
Accession: 006774312

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The regulatory and promoter regions of the gene for acid phosphatase of optimum pH 2.5 (appA) of Escherichia coli has been characterized by constructing appA-lacZ protein fusions. Monitoring of .beta.-galactosidase activity showed that the cloned fragment harbored a region that was responsible for a negative control of transcription mediated by the cAMP-cAMP receptor (CAP) complex. The nucleotide sequence of the segment was determined. A region containing a putative CAP binding site, overlapping the -10 region of the promoter was found. Deletion analysis around the promoter region, using appA-lacZ protein fusions substantiated the hypothesis for a role of the 'consensus' sequence in the negative control mediated by cyclic AMP. In addition, the coding sequence revealed the likely existence of a signal peptide similar to the one found for other exported proteins, upstream from the phosphatase protein sequence.