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Competition for the nascent leading strand shapes the requirements for PCNA loading in the replisome

Year: 2025
Type: article
Abstract: During DNA replication, the DNA polymerases Pol δ and Pol ε utilise the ring-shaped sliding clamp PCNA to enhance their processivity. PCNA loading onto DNA is accomplished by the clamp loaders RFC and Ctf18-RFC, which function primarily on the lagging and the leading strand, respectively. RFC activity is essential for lagging-strand replication by Pol δ, but it is unclear why Ctf18-RFC is required for leading-strand PCNA loading and why RFC cannot fulfil this function. Here, we show that RFC cannot load PCNA once Pol ε has been incorporated into the budding yeast replisome and commenced leading-strand synthesis, and this state is maintained during replisome progression. By contrast, we find that Ctf18-RFC is uniquely equipped to load PCNA onto the leading strand and show that this activity requires a direct interaction between Ctf18 and the CMG (Cdc45-MCM-GINS) helicase. Our work uncovers a mechanistic basis for why replisomes require a dedicated leading-strand clamp loader.
DOI: 10.1038/s44318-025-00386-4
Language: English
Open Access status: gold
Estimated APC paid: $7,990
OpenAlex ID: W4408030489
FWCI: 1.776
Cites: 59
Cited by: 7
Related to: 10