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EMBO Rep
2021 Mar 03;223:e52164. doi: 10.15252/embr.202052164.
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CUL2LRR1 , TRAIP and p97 control CMG helicase disassembly in the mammalian cell cycle.
Villa F
,
Fujisawa R
,
Ainsworth J
,
Nishimura K
,
Lie-A-Ling M
,
Lacaud G
,
Labib KP
.
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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.
C578/A25669 Cancer Research UK (CRUK), JP20K21423 MEXT | Japan Society for the Promotion of Science (JSPS), MC_UU_12016/13 UKRI | Medical Research Council (MRC), BB/I001794/1/BB Biotechnology and Biological Sciences Research Council , MC_UU_00018/4 Medical Research Council , JP19K06611 MEXT | Japan Society for the Promotion of Science (JSPS), Wellcome Trust , C5759/A20971 Cancer Research UK (CRUK), Naito Foundation (), C578/A24558 Cancer Research UK (CRUK), 102943/Z/13/Z Wellcome Trust (WT), C578/A25669 Cancer Research UK, MC_UU_12016/13 Medical Research Council , C5759/A20971 Cancer Research UK, C578/A24558 Cancer Research UK, 102943/Z/13/Z Wellcome Trust
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