CUL2LRR1, TRAIP and p97 control CMG helicase disassembly in the mammalian cell cycle

Fabrizio Villa, Ryo Fujisawa, Johanna Ainsworth, Kohei Nishimura, Michael Lie-A-Ling, Georges Lacaud, Karim Labib (Lead / Corresponding author)

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Abstract

The eukaryotic replisome is disassembled in each cell cycle, dependent upon ubiquitylation of the CMG helicase. Studies of Saccharomyces cerevisiae, Caenorhabditis elegans and Xenopus laevis have revealed surprising evolutionary diversity in the ubiquitin ligases that control CMG ubiquitylation, but regulated disassembly of the mammalian replisome has yet to be explored. Here, we describe a model system for studying the ubiquitylation and chromatin extraction of the mammalian CMG replisome, based on mouse embryonic stem cells. We show that the ubiquitin ligase CUL2LRR1 is required for ubiquitylation of the CMG‐MCM7 subunit during S‐phase, leading to disassembly by the p97 ATPase. Moreover, a second pathway of CMG disassembly is activated during mitosis, dependent upon the TRAIP ubiquitin ligase that is mutated in primordial dwarfism and mis‐regulated in various cancers. These findings indicate that replisome disassembly in diverse metazoa is regulated by a conserved pair of ubiquitin ligases, distinct from those present in other eukaryotes.
Original languageEnglish
Article numbere52164
Number of pages13
JournalEMBO Reports
Early online date15 Feb 2021
DOIs
Publication statusE-pub ahead of print - 15 Feb 2021

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