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J. Biol. Chem., Vol. 278, Issue 10, 8653-8660, March 7, 2003
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From the Molecular Biology Program, Memorial Sloan-Kettering Cancer
Center, New York, New York 10021
topB, encoding topoisomerase III, was
identified as a high copy suppressor of the temperature-sensitive
parC1215 allele, encoding one of the subunits of
topoisomerase IV. Overexpression of topoisomerase III at the
nonpermissive temperature was shown subsequently to restore timely
chromosome decatenation and suppress lethality in strains carrying
either temperature-sensitive parE or parC alleles. By developing an assay in vitro for precatenane
unlinking, we demonstrated directly that both topoisomerase III and
topoisomerase IV were efficient at this task, whereas DNA gyrase was
very inefficient at precatenane removal. These observations suggest
that precatenane unlinking is sufficient to sustain decatenation of
replicating daughter chromosomes in the cell.
Topoisomerase III Can Serve as the Cellular
Decatenase in Escherichia coli*
*
This work was supported by National Institutes of Health
Grant GM34558.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed: Molecular Biology
Program, Memorial Sloan-Kettering Cancer Center, 1275 York Ave., New
York, NY 10021. Tel.: 212-639-5890; Fax: 212-717-3627; E-mail: k-marians@ski.mskcc.org.
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