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XB-ART-42273
Mol Cell 2010 Oct 08;401:22-33. doi: 10.1016/j.molcel.2010.09.015.
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CRL4(Cdt2)-mediated destruction of the histone methyltransferase Set8 prevents premature chromatin compaction in S phase.

Centore RC , Havens CG , Manning AL , Li JM , Flynn RL , Tse A , Jin J , Dyson NJ , Walter JC , Zou L .


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The proper coordination between DNA replication and mitosis during cell-cycle progression is crucial for genomic stability. During G2 and mitosis, Set8 catalyzes monomethylation of histone H4 on lysine 20 (H4K20me1), which promotes chromatin compaction. Set8 levels decline in S phase, but why and how this occurs is unclear. Here, we show that Set8 is targeted for proteolysis in S phase and in response to DNA damage by the E3 ubiquitin ligase, CRL4(Cdt2). Set8 ubiquitylation occurs on chromatin and is coupled to DNA replication via a specific degron in Set8 that binds PCNA. Inactivation of CRL4(Cdt2) leads to Set8 stabilization and aberrant H4K20me1 accumulation in replicating cells. Transient S phase expression of a Set8 mutant lacking the degron promotes premature H4K20me1 accumulation and chromatin compaction, and triggers a checkpoint-mediated G2 arrest. Thus, CRL4(Cdt2)-dependent destruction of Set8 in S phase preserves genome stability by preventing aberrant chromatin compaction during DNA synthesis.

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Species referenced: Xenopus
Genes referenced: dtl pcna

References [+] :
Abbas, PCNA-dependent regulation of p21 ubiquitylation and degradation via the CRL4Cdt2 ubiquitin ligase complex. 2008, Pubmed