Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10799035 | Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms | 2015 | 12 Pages |
Abstract
Pokemon, an important proto-oncoprotein, is a transcriptional repressor that belongs to the POK (POZ and Krüppel) family. Smad4, a key component of TGF-β pathway, plays an essential role in TGF-β-induced transcriptional responses. In this study, we show that Pokemon can interact directly with Smad4 both in vitro and in vivo. Overexpression of Pokemon decreases TGF-β-induced transcriptional activities, whereas knockdown of Pokemon increases these activities. Interestingly, Pokemon does not affect activation of Smad2/3, formation of Smads complex, or DNA binding activity of Smad4. TGF-β1 treatment increases the interaction between Pokemon and Smad4, and also enhances the recruitment of Pokemon to Smad4-DNA complex. In addition, we also find that Pokemon recruits HDAC1 to Smad4 complex but decreases the interaction between Smad4 and p300/CBP. Taken together, all these data suggest that Pokemon is a new partner of Smad4 and plays a negative role in TGF-β pathway.
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Authors
Yutao Yang, Jiajun Cui, Feng Xue, Chuanfu Zhang, Zhu Mei, Yue Wang, Mingjun Bi, Dapeng Shan, Alex Meredith, Hui Li, Zhi-Qing David Xu,