CUL2(LRR1) , TRAIP and p97 control CMG helicase disassembly in the mammalian cell cycle
Authors
Villa, F.Fujisawa, R.
Ainsworth, J.
Nishimura, K.
Lie-A-Ling, Michael
Lacaud, Georges
Labib, K. P.
Affiliation
The MRC Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, DundeeIssue Date
2021
Metadata
Show full item recordAbstract
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.Citation
Villa F, Fujisawa R, Ainsworth J, Nishimura K, Lie ALM, Lacaud G, et al. CUL2(LRR1) , TRAIP and p97 control CMG helicase disassembly in the mammalian cell cycle. EMBO Rep. 2021;22(3):e52164.Journal
EMBO ReportsDOI
10.15252/embr.202052164PubMed ID
33590678Additional Links
https://dx.doi.org/10.15252/embr.202052164Type
ArticleLanguage
enae974a485f413a2113503eed53cd6c53
10.15252/embr.202052164
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