CRL4(Cdt2) regulates cell proliferation and histone gene expression by targeting PR-Set7/Set8 for degradation.
CRL4(Cdt2) regulates cell proliferation and histone gene expression by targeting PR-Set7/Set8 for degradation.
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DOI:
10.1016/j.molcel.2010.09.014
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发表时间:
2010-10-08
期刊:
影响因子:
16
通讯作者:
Dutta A
中科院分区:
文献类型:
--
作者:
Abbas T;Shibata E;Park J;Jha S;Karnani N;Dutta A
PR-Set7/Set8 is a cell cycle-regulated enzyme that monomethylates lysine 20 of histone H4 (H4K20). Set8 and monomethylated H4K20 are virtually undetectable during G1 and S phases of the cell cycle but increase in late S and in G2. We identify CRL4Cdt2 as the principal E3 ubiquitin ligase responsible for Set8 proteolytic degradation in the S-phase of the cell cycle, which requires Set8-PCNA interaction. Inactivation of the CRL4-Cdt2-PCNA-Set8 degradation axis results in (a) DNA damage and the induction of tumor suppressor p53 and p53-transactivated pro-apoptotic genes, (b) delayed progression through G2 phase of the cell cycle due to activation of the G2/M check-point, (c) specific repression of histone gene transcription and depletion of the histone proteins, and (d) repression of E2F1-dependent gene transcription. These results demonstrate a central role of CRL4Cdt2-dependent cell cycle regulation of Set8 for the maintenance of a stable epigenetic state essential for cell viability.
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