Abstract:
:The DnaA protein of Escherichia coli is a multi-functional protein which, In addition to promoting initiation of replication, can regulate the initiation or termination of transcription of a variety of genes. It acts by binding to DNA at a defined sequence, termed a DnaA-box. Three candidate DnaA-boxes which occur within the essential cell-division genes, ftsQ and ftsA, have been hypothesized to mediate the response of the downstream ftsZ gene to intracellular levels of DnaA, and thus to couple the processes of initiation and cell division. We show here that, although transcription from promoters upstream of ftsZ is increased when initiation of chromosome replication is blocked by DnaA inactivation, this response is not mediated by the DnaA-boxes near these promoters, nor is it specific to DnaA. We show, furthermore, that mutational inactivation of the putative DnaA-binding sites in the fts region of the chromosome does not lead to impaired growth or reduced survival of cells.
journal_name
Mol Microbioljournal_title
Molecular microbiologyauthors
Smith RW,McAteer S,Masters Mdoi
10.1046/j.1365-2958.1996.6431365.xsubject
Has Abstractpub_date
1996-07-01 00:00:00pages
361-72issue
2eissn
0950-382Xissn
1365-2958journal_volume
21pub_type
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