Transcription termination in the Escherichia coli dnaA gene is not mediated by the internal DnaA box

I. Perez-Roger, F. Macian, M. E. Armengod

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


DnaA protein is a DNA-binding protein which recognizes a 9-bp consensus sequence called the DnaA box. By binding to DnaA boxes, DnaA protein regulates initiation of chromosomal replication and transcription of several genes. The dnaA gene contains two DnaA boxes, one located in the regulatory region and one within the structural gene. In this paper, we explore the role of the internal DnaA box in dnaA expression because it has been proposed that the DnaA box-DnaA protein complex can block transcribing RNA polymerase. Firstly, we analyzed the degree of derepression of the dnaA gene, measured as β-galactosidase activity of a dnaA-lacZ fusion inserted onto the bacterial chromosome, produced by an extra copy number of the dnaA DnaA boxes carried by multicopy plasmids. Secondly, we analyzed repression produced by elevated levels of DnaA protein on single-copy dnaA-lacZ fusions containing or not containing the internal DnaA box. Our results indicate that the internal DnaA box does not play a regulatory role in dnaA expression.

Original languageEnglish (US)
Pages (from-to)1896-1899
Number of pages4
JournalJournal of Bacteriology
Issue number7
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology


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