The initiator function of DnaA protein is negatively regulated by the sliding clamp of the E. coli Chromosomal replicase

Tsutomu Katayama, Toshio Kubota, Kenji Kurokawa, Elliott Crooke, Kazuhisa Sekimizu

Research output: Contribution to journalArticlepeer-review

254 Citations (Scopus)

Abstract

The β subunit of DNA polymerase III is essential for negative regulation of the initiator protein, DnaA. DnaA inactivation occurs through accelerated hydrolysis of ATP bound to DnaA; the resulting ADP-DnaA fails to initiate replication. The ability of β subunit to promote DnaA inactivation depends on its assembly as a sliding clamp on DNA and must be accompanied by a partially purified factor, IdaB protein. DnaA inactivation in the presence of IdaB and DNA polymerase III is further stimulated by DNA synthesis, indicating close linkage between initiator inactivation and replication. In vivo, DnaA predominantly takes on the ADP form in a β subunit-dependent manner. Thus, the initiator is negatively regulated by action of the replicase, a mechanism that may be key to effective control of the replication cycle.

Original languageEnglish
Pages (from-to)61-71
Number of pages11
JournalCell
Volume94
Issue number1
DOIs
Publication statusPublished - Jul 10 1998

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

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