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EMBO Rep. 2000 Oct;1(4):323-7.

New genes with old modus operandi. The connection between supercoiling and partitioning of DNA in Escherichia coli.

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1
Department of Cell and Molecular Biology, Uppsala University, Biomedical Centre, Sweden.

Abstract

The process of partitioning bacterial sister chromosomes into daughter cells seems to be distinct from chromatid segregation during eukaryotic mitosis. In Escherichia coli, partitioning starts soon after initiation of replication, when the two newly replicated oriCs move from the cell centre to quarter positions within the cell. As replication proceeds, domains of the compact, supercoiled chromosome are locally decondensed ahead of the replication fork. The nascent daughter chromosomes are recondensed and moved apart through the concerted activities of topoisomerases and the SeqA (sequestration) and MukB (chromosome condensation) proteins, all of which modulate nucleoid superhelicity. Thus, genes involved in chromosome topology, once set aside as 'red herrings' in the search for 'true' partition functions, are again recognized as being important for chromosome partitioning in E. coli.

PMID:
11269497
PMCID:
PMC1083751
DOI:
10.1093/embo-reports/kvd077
[Indexed for MEDLINE]
Free PMC Article
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