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
中科院分区:
文献类型:
--
作者:
Deato, Maria Divina E.;Marr, Michael T.;Sottero, Theo;Inouye, Carla;Hu, Ping;Tjian, Robert
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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