Pokemon (FBI-1) interacts with Smad4 to repress TGF-ß-induced transcriptional responses.
Biochim Biophys Acta
; 1849(3): 270-81, 2015 Mar.
Article
in En
| MEDLINE
| ID: mdl-25514493
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-ß pathway, plays an essential role in TGF-ß-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-ß-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-ß1 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-ß pathway.
Key words
Full text:
1
Database:
MEDLINE
Main subject:
Transcription Factors
/
Transforming Growth Factor beta
/
DNA-Binding Proteins
/
Smad4 Protein
/
Protein Interaction Maps
Limits:
Humans
Language:
En
Year:
2015
Type:
Article