EBS is a bivalent histone reader that regulates floral phase transition in Arabidopsis.

EBS is a bivalent histone reader that regulates floral phase transition in Arabidopsis.
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DOI:
10.1038/s41588-018-0187-8
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发表时间:
2018-09
期刊:
影响因子:
30.8
通讯作者:
Zhong X
Zhong X
中科院分区:
生物学1区
文献类型:
--
作者:
Yang Z;Qian S;Scheid RN;Lu L;Chen X;Liu R;Du X;Lv X;Boersma MD;Scalf M;Smith LM;Denu JM;Du J;Zhong X

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细胞感知并将多功能信号转化为不同染色质和转录状态的能力对于许多生物过程至关重要。在植物中,及时过渡到开花状态对于成功繁殖至关重要。短日照早抽薹(EBS)是拟南芥中一个防止早熟开花的负转录调节因子。我们发现EBS含有二价溴邻近同源(BAH)-植物同源域(PHD)阅读器模块,分别结合H3 K27 me 3和H3 K4 me 3。我们观察到与H3 K4 me 3、H3 K27 me 3和Polycomb阻遏物复合物2(PRC 2)共富集的一组EB相关基因。值得注意的是,EBS采用自抑制模式来介导其在H3 K27 me 3和H3 K4 me 3之间结合偏好的切换。这种结合平衡是至关重要的,因为EBS-H3 K27 me 3或EBS-H3 K4 me 3相互作用的破坏诱导早期花转变。我们的研究结果确定了一个二价染色质读者能够识别两个拮抗组蛋白标记,我们提出了一个独特的机制,积极和抑制染色质状态之间的相互作用。
The ability of cells to perceive and translate versatile cues into differential chromatin and transcriptional states is critical for many biological processes. In plants, timely transition to a flowering state is crucial for successful reproduction. EARLY BOLTING IN SHORT DAY (EBS) is a negative transcriptional regulator that prevents premature flowering in Arabidopsis thaliana. We found that EBS contains bivalent bromo-adjacent homology (BAH)-plant homeodomain (PHD) reader modules that bind H3K27me3 and H3K4me3, respectively. We observed co-enrichment of a subset of EBS-associated genes with H3K4me3, H3K27me3, and Polycomb repressor complex 2 (PRC2). Notably, EBS adopted an autoinhibition mode to mediate its switch in binding preference between H3K27me3 and H3K4me3. This binding balance was critical because disruption of either EBS-H3K27me3 or EBS-H3K4me3 interaction induced early floral transition. Our results identify a bivalent chromatin reader capable of recognizing two antagonistic histone marks, and we propose a distinct mechanism of interaction between active and repressive chromatin states.
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