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J. Biol. Chem., Vol. 277, Issue 17, 14986-14995, April 26, 2002
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From the The ATP-bound DnaA protein opens duplex DNA at
the Escherichia coli origin of replication, leading to a
series of initiation reactions in vitro. When loaded on
DNA, the DNA polymerase III sliding clamp stimulates hydrolysis of
DnaA-bound ATP in the presence of the IdaB/Hda protein, thereby
yielding ADP-DnaA, which is inactive for initiation in
vitro. This negative feedback regulation of DnaA activity is
proposed to play a crucial role in the replication cycle. We here
report that the mutant protein DnaA R334A is inert to hydrolysis of
bound ATP, although its affinities for ATP and ADP remain unaffected.
The ATP-bound DnaA R334A protein, but not the ADP form, initiates
minichromosomal replication in vitro at a level similar to
that seen for wild-type DnaA. When expressed at moderate levels
in vivo, DnaA R334A is predominantly in the ATP-bound form,
unlike the wild-type and DnaA E204Q proteins, which in
vitro hydrolyze ATP in a sliding clamp- and
IdaB/Hda-dependent manner. Furthermore, DnaA R334A, but not
the wild-type or the DnaA E204Q proteins, promotes overinitiation of
chromosomal replication. These in vivo data support a
crucial role for bound nucleotides in regulating the activity of DnaA
during replication. Based on a homology modeling analysis, we
suggest that the Arg-334 residue closely interacts with bound nucleotides.
Department of Molecular Microbiology and the
Department of Immunology, Kyushu University Graduate School
of Pharmaceutical Sciences, Higashi-ku, Fukuoka 812-8582, Japan and the
¶ Department of Developmental Biochemistry, Graduate School of
Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo,
Bunkyo-ku, Tokyo 113-0033, Japan
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