We have updated our privacy policy. If you have any question, contact us at privacy@scicrunch.org. Dismiss and don't show again

Searching across hundreds of databases

Our searching services are busy right now. Your search will reload in five seconds.

Forgot Password

If you have forgotten your password you can enter your email here and get a temporary password sent to your email.

Activation of Smad transcriptional activity by protein inhibitor of activated STAT3 (PIAS3).

Smad proteins play pivotal roles in mediating the transforming growth factor beta (TGF-beta) transcriptional responses. We show in this report that PIAS3, a member of the protein inhibitor of activated STAT (PIAS) family, activates TGF-beta/Smad transcriptional responses. PIAS3 interacts with Smad proteins, most strongly with Smad3. PIAS3 and Smad3 interact with each other at the endogenous protein level in mammalian cells and also in vitro, and the association occurs through the C-terminal domain of Smad3. We further show that PIAS3 can interact with the general coactivators p300/CBP, the first evidence that a PIAS protein can associate with p300/CBP. In contrast, PIASy, which inhibits Smad transcriptional activity and other transcriptional responses, is unable to interact with p300/CBP. The RING domain of PIAS3 is essential for interaction with p300/CBP, and a RING domain mutant PIAS3, which cannot bind p300/CBP, no longer activates TGF-beta/Smad-dependent transcription. Furthermore, we show that PIAS3, Smad3, and p300 can form a ternary complex, which is markedly increased by TGF-beta treatment. Taken together, our studies indicate that on TGF-beta treatment, PIAS3 can form a complex with Smads and p300/CBP and activate Smad transcriptional activity.

Pubmed ID: 14691252 RIS Download

Mesh terms: Animals | COS Cells | Carrier Proteins | Cell Line | DNA-Binding Proteins | Histone Deacetylase 1 | Histone Deacetylases | Humans | In Vitro Techniques | Intracellular Signaling Peptides and Proteins | Macromolecular Substances | Nuclear Proteins | Protein Inhibitors of Activated STAT | Recombinant Proteins | Smad3 Protein | Trans-Activators | Transcriptional Activation | Transforming Growth Factor beta | Two-Hybrid System Techniques

Research resources used in this publication

None found

Research tools detected in this publication

None found

Data used in this publication

None found

Associated grants


Publication data is provided by the National Library of Medicine ® and PubMed ®. Data is retrieved from PubMed ® on a weekly schedule. For terms and conditions see the National Library of Medicine Terms and Conditions.

We have not found any resources mentioned in this publication.