MyoD targets TAF3/TRF3 to activate myogenin transcription.

MyoD targets TAF3/TRF3 to activate myogenin transcription.
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DOI:
10.1016/j.molcel.2008.09.009
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发表时间:
2008-10-10
期刊:
影响因子:
16
通讯作者:
Tjian, Robert
Tjian, Robert
中科院分区:
生物学1区
文献类型:
--
作者:
Deato, Maria Divina E.;Marr, Michael T.;Sottero, Theo;Inouye, Carla;Hu, Ping;Tjian, Robert

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骨骼肌分化需要一系列转录事件来控制肌肉特异性基因的时空表达。直到最近,肌肉特异性转录主要归因于原型增强子结合因子,而核心启动子识别复合物在指导肌肉发生中的作用仍然未知。在这里,我们报告了一个纯化的重建系统的开发,以分析TAF 3/TRF 3复合物在肌细胞生成素启动子处指导转录起始的特性。重要的是,需要这种新的复合物来取代经典的TFIID,以重现MyoD依赖性的肌细胞生成素激活。体外和基于细胞的测定鉴定了介导MyoD靶向的共激活因子功能的TAF 3结构域。我们的研究结果还表明终末分化肌管中CRSP/Mediator的变化。在肌生成过程中核心启动子识别复合物的这种转换允许激活剂和TAF共激活剂之间更平衡的分工,从而提供另一种策略来适应后生动物发育过程中的细胞特异性调节。
Skeletal muscle differentiation requires a cascade of transcriptional events to control the spatial and temporal expression of muscle-specific genes. Until recently, muscle-specific transcription was primarily attributed to prototypic enhancer-binding factors while the role of core promoter recognition complexes in directing myogenesis remained unknown. Here, we report the development of a purified reconstituted system to analyze the properties of a TAF3/TRF3 complex in directing transcription initiation at the Myogenin promoter. Importantly, this new complex is required to replace the canonical TFIID to recapitulate MyoD-dependent activation of Myogenin. In vitro and cell-based assays identify a domain of TAF3 that mediates co-activator functions targeted by MyoD. Our findings also suggest changes to CRSP/Mediator in terminally differentiated myotubes. This switching of the core promoter recognition complex during myogenesis allows a more balanced division of labor between activators and TAF coactivators thus providing another strategy to accommodate cell-specific regulation during metazoan development.
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