Abstract
To establish functional cohesion between replicated sister chromatids, cohesin is recruited to chromatin before S phase. Cohesin is loaded onto chromosomes in the G1 phase by the Scc2–Scc4 complex, but little is known about how Scc2–Scc4 itself is recruited to chromatin. Using Xenopus egg extracts as a vertebrate model system, we showed previously that the chromatin association of Scc2 and cohesin is dependent on the prior establishment of prereplication complexes (pre-RCs) at origins of replication. Here, we report that Scc2–Scc4 exists in a stable complex with the Cdc7–Drf1 protein kinase (DDK), which is known to bind pre-RCs and activate them for DNA replication. Immunodepletion of DDK from Xenopus egg extracts impairs chromatin association of Scc2–Scc4, a defect that is reversed by wild-type, but not catalytically inactive DDK. A complex of Scc4 and the N terminus of Scc2 is sufficient for chromatin loading of Scc2–Scc4, but not for cohesin recruitment. These results show that DDK is required to tether Scc2–Scc4 to pre-RCs, and they underscore the intimate link between early steps in DNA replication and cohesion.
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Dates
Type | When |
---|---|
Created | 17 years, 1 month ago (July 15, 2008, 1:34 p.m.) |
Deposited | 3 years, 9 months ago (Nov. 16, 2021, 12:16 p.m.) |
Indexed | 4 days, 4 hours ago (Sept. 3, 2025, 6:25 a.m.) |
Issued | 17 years, 1 month ago (July 15, 2008) |
Published | 17 years, 1 month ago (July 15, 2008) |
Published Online | 17 years, 1 month ago (July 15, 2008) |
Published Print | 17 years, 1 month ago (July 15, 2008) |
@article{Takahashi_2008, title={Cdc7–Drf1 kinase links chromosome cohesion to the initiation of DNA replication in Xenopus egg extracts}, volume={22}, ISSN={1549-5477}, url={http://dx.doi.org/10.1101/gad.1683308}, DOI={10.1101/gad.1683308}, number={14}, journal={Genes & Development}, publisher={Cold Spring Harbor Laboratory}, author={Takahashi, Tatsuro S. and Basu, Abhijit and Bermudez, Vladimir and Hurwitz, Jerard and Walter, Johannes C.}, year={2008}, month=jul, pages={1894–1905} }