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- W1974394081 abstract "We report that a plasmid replicating in Xenopus egg extracts becomes negatively supercoiled during replication initiation. Supercoiling requires the initiation factor Cdc45, as well as the single-stranded DNA-binding protein RPA, and therefore likely represents origin unwinding. When unwinding is prevented, Cdc45 binds to chromatin whereas DNA polymerase alpha does not, indicating that Cdc45, RPA, and DNA polymerase alpha bind chromatin sequentially at the G1/S transition. Whereas the extent of origin unwinding is normally limited, it increases dramatically when DNA polymerase alpha is inhibited, indicating that the helicase that unwinds DNA during initiation can become uncoupled from the replication fork. We discuss the implications of these results for the location of replication start sites relative to the prereplication complex." @default.
- W1974394081 created "2016-06-24" @default.
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- W1974394081 date "2000-04-01" @default.
- W1974394081 modified "2023-10-15" @default.
- W1974394081 title "Initiation of Eukaryotic DNA Replication" @default.
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- W1974394081 doi "https://doi.org/10.1016/s1097-2765(00)80241-5" @default.
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