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J. Biol. Chem., Vol. 268, Issue 18, 13128-13136, 06, 1993
TR Hupp and JM Kaguni
A mutant form of DnaA protein encoded by the dnaA5 allele has been purified
and compared biochemically to its wild type counterpart. Biochemical
properties of DnaA5 protein include: 1) thermolabile activity in an oriC
plasmid replication system dependent on a crude enzyme fraction, 2)
comparable affinity relative to DnaA protein in binding to restriction
fragments containing either the Escherichia coli chromosomal origin, oriC,
or the dnaA promoter, 3) formation of a nucleoprotein complex similar to
DnaA protein at the DnaA boxes within the dnaA promoter as detected by
protection from DNase I cleavage, 4) formation of an altered nucleoprotein
complex with oriC as judged by DNase I protection experiments, 5)
inactivity in unwinding of oriC, 6) inactivity in oriC plasmid replication
systems dependent on purified enzymes, and 7) inhibition of DnaA protein by
addition of DnaA5 protein in assays of replication and of unwinding of
oriC, suggesting that mixed complexes formed between wild type and mutant
proteins are inactive.
DnaA5 protein is thermolabile in initiation of replication from the chromosomal origin of Escherichia coli
Department of Biochemistry, Michigan State University, East Lansing 48824-1319.
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