Journal
JOURNAL OF CELL BIOLOGY
Volume 159, Issue 4, Pages 541-547Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.200207090
Keywords
MCM10; Cdc7; ORC; TopBP 1; cell cycle
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Funding
- NIGMS NIH HHS [T32GM07620, T32 GM007598, T32 GM007620, T32GM07598] Funding Source: Medline
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The initiation of eukaryotic DNA replication involves origin recruitment and activation of the MCM2-7 complex, the putative replicative helicase. Minichromosome maintenance (MCM)2-7 recruitment to origins in G1 requires origin recognition complex (ORC), Cdt1, and Cdc6, and activation at G1/S requires MCM10 and the protein kinases Cdc7 and S-Cdk, which together recruit Cdc45, a putative MCM2-7 cofactor required for origin unwinding. Here, we show that the Xenopus BRCA1 COOH terminus repeat-containing Xmus101 protein is required for loading of Cdc45 onto the origin. Xmus101 chromatin association is dependent on ORC, and independent of S-Cdk and MCM2-7. These results define a new factor that is required for Cdc45 loading. Additionally, these findings indicate that the initiation complex assembly pathway bifurcates early, after ORC association with the origin, and that two parallel pathways, one controlled by MCM2-7, and the other by Xmus101 cooperate to load Cdc45 onto the origin.
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