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Nucleic Acids Research, 2001, Vol. 29, No. 11 2251-2259
© 2001 Oxford University Press

Identification of a putative chromosomal replication origin from Helicobacter pylori and its interaction with the initiator protein DnaA

Anna Zawilak, Stanislaw Cebrat1, Pawel Mackiewicz1, Anna Król-Hulewicz, Dagmara Jakimowicz, Walter Messer2, Grazyna Gosciniak3 and Jolanta Zakrzewska-Czerwinska*

Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Weigla 12, 53-114 Wroclaw, Poland, 1Institute of Microbiology,University of Wroclaw, Przybyszewskiego 63/77, 51-148 Wroclaw, Poland, 2Max-Planck-Institut für Molekulare Genetik, Ihnestrasse 73, D-14195 Berlin-Dahlem, Germany and 3Department of Microbiology, Medical University of Wroclaw, Chanubinskiego 4, 50-368 Wroclaw, Poland

The key elements of the initiation of Helicobacter pylori chromosome replication, DnaA protein and putative oriC region, have been characterized. The gene arrangement in the H.pylori dnaA region differs from that found in many other eubacterial dnaA regions (rnpA-rmpH-dnaA-dnaN-recF-gyrB). Helicobacter pylori dnaA is flanked by two open reading frames with unknown function, while dnaN-gyrB and rnpA-rmpH loci are separated from the dnaA gene by 600 and 90 kb, respectively. We show that the dnaA gene encoding initiator protein DnaA is expressed in H.pylori cells. The H.pylori DnaA protein, like other DnaA proteins, can be divided into four domains. Here we demonstrate that the C-terminal domain of H.pylori DnaA protein is responsible for DNA binding. Using in silico and in vitro studies, the putative oriC region containing five DnaA boxes has been located upstream of the dnaA gene. DNase I and gel retardation analyses show that the C-terminal domain of H.pylori DnaA protein specifically binds each of five DnaA boxes.

* To whom correspondence should be addressed. Tel: +48 71 3732274; Fax: +48 71 3732587; Email: zakrzew{at}immuno.iitd.pan.wroc.plPresent address: Anna Król-Hulewicz, Institute of Biochemistry and Molecular Biology, University of Wroclaw, Tamka 2, 50-137 Wroclaw, Poland


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