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Visualisation of plasmid replication intermediates containing reversed forks

AuthorsViguera, Enrique; Hernandez, Pablo ; Krimer, Dora B. ; Lurz, Rudi; Schvartzman, Jorge Bernardo
Issue DateJan-2000
PublisherOxford University Press
CitationNucleic Acids Research 2000,28 (2) 498–503
AbstractBlockage of replication forks can have deleterious consequences for the cell as it may prompt premature termination of DNA replication. Moreover, the blocked replication intermediate (RI) could be particularly sensitive to recombination processes. We analysed the different populations of RIs generated in vivo in the bacterial plasmid pPI21 after pausing of replication forks at the inversely oriented ColE1 origin. To achieve this goal, a new method was developed based on two-dimensional agarose gel electrophoresis. This method allows the isolation of specific RIs, even when they were rather scarce, from the total DNA. Here we describe the occurrence of RI restriction fragments containing reversed forks. These Holliday-like structures have been postulated but never observed before.
Description6 p.-4 fig.
Publisher version (URL)http://dx.doi.org/10.1093/nar/28.2.498
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