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Regulation of adenylate cyclase synthesis in Escherichia coli: nucleotide sequence of the control region


Regulation of adenylate cyclase synthesis in Escherichia coli: nucleotide sequence of the control region



EMBO Journal 2(5): 791-797



ISSN/ISBN: 0261-4189

PMID: 6357786

DOI: 10.1002/j.1460-2075.1983.tb01502.x

The regulatory region of the cya gene from Escherichia coli has been characterized by nucleotide sequence analysis and genetic approaches. Two promoters, P1 and P2, organized in that order with respect to the beginning of the cya open reading frame, were identified. Using cya-lac operon and protein fusions, it was possible to show that both promoters are active in vivo. P1 activity seemed sensitive to catabolite repression whereas activity of the stronger promoter, P2, did not respond to inhibition by glucose. No effect of cAMP or its receptor, catabolite activator protein (CAP), could be found although the DNA sequence reveals a consensus CAP site downstream of P2. The 548 nucleotides situated at the 3' end of the sequence carry an open reading frame which can tentatively be assigned to the beginning of adenylate cyclase. Among noteworthy features of the corresponding sequence are an UUG codon as the putative start site of cyclase, and a long hydrophobic stretch of amino acids resembling leader peptides in secreted or membrane proteins.

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Accession: 006286361

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