TGIF1 homeodomain interacts with Smad MH1 domain and represses TGF-β signaling.

TGIF1 homeodomain interacts with Smad MH1 domain and represses TGF-β signaling.
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DOI:
10.1093/nar/gky680
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发表时间:
2018-09-28
影响因子:
14.9
通讯作者:
Macias MJ
Macias MJ
中科院分区:
生物学2区
文献类型:
--
作者:
Guca E;Suñol D;Ruiz L;Konkol A;Cordero J;Torner C;Aragon E;Martin-Malpartida P;Riera A;Macias MJ

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TGIF 1是一种多功能蛋白,通过与Smad 2-Smad 4复合物相互作用来抑制TGF-β激活的转录。我们发现TGIF 1-HD结合TGACA基序的复杂结构揭示了一种组合的结合模式,一方面涉及HD核心和大沟,另一方面涉及DNA的氨基末端(N端)臂和小沟。我们还表明,TGIF 1-HD与Smad蛋白的MH 1结构域相互作用,从而表明TGIF 1-HD也是一个蛋白结合结构域。此外,HD-MH 1复合物的形成部分阻碍了复合物的DNA结合位点,阻止了TGIF 1-HD与DNA的有效相互作用。我们提出,TGIF 1 C-端与Smad 2-MH 2结构域的结合使HD和MH 1结构域非常接近。这种局部接近促进了这些DNA结合结构域的相互作用,从而加强了蛋白质复合物的形成而不是DNA结合。一旦蛋白复合物形成,TGIF 1-Smad系统将从启动子/增强子释放,从而说明TGIF 1作为Smad诱导的TGF-β信号传导的活性阻遏物发挥其功能的机制之一。
TGIF1 is a multifunctional protein that represses TGF-β-activated transcription by interacting with Smad2-Smad4 complexes. We found that the complex structure of TGIF1–HD bound to the TGACA motif revealed a combined binding mode that involves the HD core and the major groove, on the one hand, and the amino-terminal (N-term) arm and the minor groove of the DNA, on the other. We also show that TGIF1–HD interacts with the MH1 domain of Smad proteins, thereby indicating that TGIF1–HD is also a protein-binding domain. Moreover, the formation of the HD-MH1 complex partially hinders the DNA-binding site of the complex, preventing the efficient interaction of TGIF1–HD with DNA. We propose that the binding of the TGIF1 C-term to the Smad2-MH2 domain brings both the HD and MH1 domain into close proximity. This local proximity facilitates the interaction of these DNA-binding domains, thus strengthening the formation of the protein complex versus DNA binding. Once the protein complex has been formed, the TGIF1-Smad system would be released from promoters/enhancers, thereby illustrating one of the mechanisms used by TGIF1 to exert its function as an active repressor of Smad-induced TGF-β signaling.
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影响因子: 16.6
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