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Title

Knotting dynamics during DNA replication

AuthorsOlavarrieta, Leticia; Martínez-Robles, María Luisa ; Hernandez, Pablo ; Krimer, Dora B. ; Schvartzman, Jorge Bernardo
KeywordsReca-protein
Agarose-Gel electrophoresis
Escherichia-coli
Topoisomerase-Iv
Supercoiled DNA
Plasmids
Origins
Knots
Fork
Termination
Issue Date2002
PublisherBlackwell Publishing
CitationMol. Microbiol. 46(3):699-707(2002)
AbstractThe topology of plasmid DNA changes continuously as replication progresses. But the dynamics of the process remains to be fully understood. Knotted bubbles form when topo IV knots the daughter duplexes behind the fork in response to their degree of intertwining. Here, we show that knotted bubbles can form during unimpaired DNA replication, but they become more evident in partially replicated intermediates containing a stalled fork. To learn more about the dynamics of knot formation as replication advances, we used two-dimensional agarose gel electrophoresis to identify knotted bubbles in partially replicated molecules in which the replication fork stalled at different stages of the process. The number and complexity of knotted bubbles rose as a function of bubble size, suggesting that knotting is affected by both precatenane density and bubble size.
Description9 páginas, 7 figuras, -- PAGS nros. 699-707
Publisher version (URL)http://dx.doi.org/10.1046/j.1365-2958.2002.03217.x
URIhttp://hdl.handle.net/10261/47949
DOI10.1046/j.1365-2958.2002.03217.x
ISSN0950-382X
E-ISSN1365-2958
Appears in Collections:(CIB) Artículos
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