F-box protein CFK1 interacts with and degrades de novo DNA methyltransferase in Arabidopsis.

F-box protein CFK1 interacts with and degrades de novo DNA methyltransferase in Arabidopsis.
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F-box蛋白CFK1与拟南芥DNA甲基转移酶相互作用并降解。

DOI:
10.1111/nph.17103
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发表时间:
2021-03
期刊:
The New phytologist
影响因子:
--
通讯作者:
Zhong X
Zhong X
中科院分区:
其他
文献类型:
--
作者:
Chen J;Liu J;Jiang J;Qian S;Song J;Kabara R;Delo I;Serino G;Liu F;Hua Z;Zhong X

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DNA甲基化通过基因调控和基因组稳定性控制在细胞发育和应激反应中发挥重要作用。对结构域重排的甲基转移酶2(DRM2)的精确调控是维持DNA甲基化动态平衡以确保基因组完整性的关键。与DRM2靶向机制的广泛研究相比,关于DRM2本身的质量控制方面的信息还很少。本文通过酵母双杂交筛选实验,在拟南芥中鉴定了一个新的与DRM2相互作用的E3连接酶,COP9相互作用F-box Kelch 1(CFK1),并通过泛素-26S蛋白酶体途径靶向降解DRM2。我们还进行了全基因组亚硫酸氢盐测序(BS-SEQ),以确定CFK1介导的DRM2降解的生物学意义。功能缺失的CFK1导致DRM2蛋白丰度增加,CFK1过表达显示DRM2蛋白水平降低。在特定的DRM2靶点,CFK1过表达诱导全基因组CHH的低甲基化和转录抑制。本研究揭示了CFK1调节新的DNA甲基转移酶来控制DNA甲基化水平的独特机制。
DNA methylation plays crucial roles in cellular development and stress responses through gene regulation and genome stability control. Precise regulation of DOMAINS REARRANGED METHYLTRANSFERASE 2 (DRM2), thede novoArabidopsis DNA methyltransferase, is crucial to maintain DNA methylation homeostasis to ensure genome integrity. Compared with the extensive studies on DRM2 targeting mechanisms, little information is known regarding the quality control of DRM2 itself.Here, we conducted yeast two‐hybrid screen assay and identified an E3 ligase, COP9 INTERACTING F‐BOX KELCH 1 (CFK1), as a novel DRM2‐interacting partner and targets DRM2 for degradation via the ubiquitin‐26S proteasome pathway inArabidopsis thaliana. We also performed whole genome bisulfite sequencing (BS‐seq) to determine the biological significance of CFK1‐mediated DRM2 degradation.Loss‐of‐functionCFK1leads to increased DRM2 protein abundance and overexpression of CFK1 showed reduced DRM2 protein levels. Consistently, CFK1 overexpression induces genome‐wide CHH hypomethylation and transcriptional de‐repression at specific DRM2 target loci.This study uncovered a distinct mechanism regulatingde novoDNA methyltransferase by CFK1 to control DNA methylation level.
DOI: 10.1038/nrm4043
发表时间: 2015-09
期刊: Nature reviews. Molecular cell biology
影响因子: --
作者:
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期刊: PLoS genetics
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