A stimulation factor for hydrolysis of ATP bound to DnaA protein, the initiator of chromosomal DNA replication in Escherichia coli

Kenji Kurokawa, Tohru Mizushima, Toshio Kubota, Tomofusa Tsuchiya, Tsutomu Katayama, Kazuhisa Sekimizu

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Hydrolysis of ATP bound to DnaA protein by its intrinsic ATPase activity negatively controls chromosomal DNA replication in Escherichia coli. We developed a new in vitro assay system for ATP hydrolysis, which makes feasible a search for factors affecting the ATPase activity of DnaA protein. A crude cell extract enhanced the hydrolysis of ATP bound to DnaA protein, in a dose-dependent manner. Gel-filtration analyses revealed a single entity of the stimulation factor for the ATP hydrolysis and an apparent molecular mass of 170 kDa. The stimulation activity for ATP hydrolysis coeluted with the inactivation activity for DnaA protein initiating an oriC DNA replication, as determined by anion-exchange and gel-filtration column chromatograrphies. Activity of the stimulation factor required DNA and ATP. These observations suggested that IdaA protein, a previously described negative factor for DnaA protein, inactivated DnaA protein through stimulation of the hydrolysis of ATP bound to DnaA protein.

Original languageEnglish
Pages (from-to)90-95
Number of pages6
JournalBiochemical and Biophysical Research Communications
Issue number1
Publication statusPublished - Feb 4 1998


All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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