Hda inactivation of DnaA is the predominant mechanism preventing hyperinitiation of Escherichia coli DNA replication.

Abstract:

:Initiation of DNA replication from the Escherichia coli chromosomal origin is highly regulated, assuring that replication occurs precisely once per cell cycle. Three mechanisms for regulation of replication initiation have been proposed: titration of free DnaA initiator protein by the datA locus, sequestration of newly replicated origins by SeqA protein and regulatory inactivation of DnaA (RIDA), in which active ATP-DnaA is converted to the inactive ADP-bound form. DNA microarray analyses showed that the level of initiation in rapidly growing cells that lack datA was indistinguishable from that in wild-type cells, and that the absence of SeqA protein caused only a modest increase in initiation, in agreement with flow-cytometry data. In contrast, cells lacking Hda overinitiated replication twofold, implicating RIDA as the predominant mechanism preventing extra initiation events in a cell cycle.

journal_name

EMBO Rep

journal_title

EMBO reports

authors

Camara JE,Breier AM,Brendler T,Austin S,Cozzarelli NR,Crooke E

doi

10.1038/sj.embor.7400467

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

736-41

issue

8

eissn

1469-221X

issn

1469-3178

pii

7400467

journal_volume

6

pub_type

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