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XB-ART-51176
Nature 2015 Sep 17;5257569:345-50. doi: 10.1038/nature14887.
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The mechanism of DNA replication termination in vertebrates.

Dewar JM , Budzowska M , Walter JC .


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Eukaryotic DNA replication terminates when replisomes from adjacent replication origins converge. Termination involves local completion of DNA synthesis, decatenation of daughter molecules and replisome disassembly. Termination has been difficult to study because termination events are generally asynchronous and sequence nonspecific. To overcome these challenges, we paused converging replisomes with a site-specific barrier in Xenopus egg extracts. Upon removal of the barrier, forks underwent synchronous and site-specific termination, allowing mechanistic dissection of this process. We show that DNA synthesis does not slow detectably as forks approach each other, and that leading strands pass each other unhindered before undergoing ligation to downstream lagging strands. Dissociation of the replicative CMG helicase (comprising CDC45, MCM2-7 and GINS) occurs only after the final ligation step, and is not required for completion of DNA synthesis, strongly suggesting that converging CMGs pass one another and dissociate from double-stranded DNA. This termination mechanism allows rapid completion of DNA synthesis while avoiding premature replisome disassembly.

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Species referenced: Xenopus laevis
Genes referenced: ccna1 cdc45 flt3 mcm2 mcm7 mnt pcna rpa1 top2a


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References [+] :
Baxter, Topoisomerase II inactivation prevents the completion of DNA replication in budding yeast. 2008, Pubmed