Structure of p300 bound to MEF2 on DNA reveals a mechanism of enhanceosome assembly.

Structure of p300 bound to MEF2 on DNA reveals a mechanism of enhanceosome assembly.
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DNA 上 p300 与 MEF2 结合的结构揭示了增强小体组装的机制

DOI:
10.1093/nar/gkr030
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发表时间:
2011-05
影响因子:
14.9
通讯作者:
Chen L
Chen L
中科院分区:
生物学2区
文献类型:
--
作者:
He J;Ye J;Cai Y;Riquelme C;Liu JO;Liu X;Han A;Chen L

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转录共激活因子CBP和p300被序列特异性转录因子募集到特定的基因组位点以控制基因表达。CBP/p300中高度保守的结构域TAZ 2结构域介导与包括肌细胞增强因子2(MEF 2)在内的多种转录因子的直接相互作用。在这里,我们报告的三元复合物的p300 TAZ 2结构域结合到MEF 2的DNA在2.2倍分辨率的晶体结构。结构揭示了三个MEF 2:DNA复合物结合到TAZ 2结构域的不同位点。使用结构导向突变和哺乳动物双杂交试验,我们表明,所有三个接口有助于MEF 2的p300的结合,这表明p300可能使用三个接口之一,在不同的细胞环境中与MEF 2相互作用,一个p300可以结合三个MEF 2:DNA复合物同时。这些研究,连同先前表征的TAZ 2复合物结合到不同的转录因子,证明了TAZ 2在蛋白质-蛋白质相互作用中的效力和多功能性。我们的研究结果也支持一个模型,其中p300促进组装的高阶增强体的同时与多个DNA结合的转录因子的相互作用。
Transcription co-activators CBP and p300 are recruited by sequence-specific transcription factors to specific genomic loci to control gene expression. A highly conserved domain in CBP/p300, the TAZ2 domain, mediates direct interaction with a variety of transcription factors including the myocyte enhancer factor 2 (MEF2). Here we report the crystal structure of a ternary complex of the p300 TAZ2 domain bound to MEF2 on DNA at 2.2Å resolution. The structure reveals three MEF2:DNA complexes binding to different sites of the TAZ2 domain. Using structure-guided mutations and a mammalian two-hybrid assay, we show that all three interfaces contribute to the binding of MEF2 to p300, suggesting that p300 may use one of the three interfaces to interact with MEF2 in different cellular contexts and that one p300 can bind three MEF2:DNA complexes simultaneously. These studies, together with previously characterized TAZ2 complexes bound to different transcription factors, demonstrate the potency and versatility of TAZ2 in protein–protein interactions. Our results also support a model wherein p300 promotes the assembly of a higher-order enhanceosome by simultaneous interactions with multiple DNA-bound transcription factors.
DOI: 10.1016/s0092-8674(00)80304-9
发表时间: 1997-06-27
期刊: CELL
影响因子: 64.5
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影响因子: 10.5
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DOI: 10.1107/s0907444998003254
发表时间: 1998-09-01
期刊: ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY
影响因子: --
作者:
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通讯作者: Warren, GL