Reconstitution of active human core Mediator complex reveals a critical role of the MED14 subunit.

Reconstitution of active human core Mediator complex reveals a critical role of the MED14 subunit.
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DOI:
10.1038/nsmb.2914
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发表时间:
2014-12
影响因子:
16.8
通讯作者:
Roeder RG
Roeder RG
中科院分区:
生物学1区
文献类型:
--
作者:
Cevher MA;Shi Y;Li D;Chait BT;Malik S;Roeder RG

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The evolutionarily conserved Mediator complex is a critical coactivator for RNA polymerase II (Pol II)-mediated transcription. Here, we report the reconstitution of a functional 15-subunit human core Mediator complex and its characterization by functional assays and chemical cross-linking coupled to mass spectrometry (CX-MS). Whereas the reconstituted head and middle modules can stably associate, only with incorporation of MED14 into the bi-modular complex does it acquire basal and coactivator functions. This results from a dramatically enhanced ability of MED14-containing complexes to associate with Pol II. Altogether, our analyses identify MED14 as both an architectural and a functional backbone of the Mediator complex. We further establish a conditional requirement for metazoan-specific MED26 that becomes evident in the presence of heterologous nuclear factors. This general approach paves the way for systematically dissecting the multiple layers of functionalities associated with the Mediator complex.
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