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Updated: Sep 11, 2025
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Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
Published on: August 9, 2019
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Multivalent interactions with CCR4-NOT and PABPC1 determine mRNA repression efficiency by tristetraprolin
Filip Pekovic1, Wi S Lai2, Joshua Corbo1
1National Cancer Institute, National Institutes of Health, Frederick, MD, 21702, USA.
Nature Communications
|August 13, 2025
Summary
Tristetraprolin proteins control mRNA decay by interacting with the CCR4-NOT complex and PABPC1. Phosphorylation regulates these interactions, influencing mRNA stability and degradation.
Area of Science:
- Molecular Biology
- Gene Regulation
- Protein-RNA Interactions
Background:
- Tristetraprolin proteins bind AU-rich elements in mRNA to regulate stability.
- mRNA deadenylation, a key step in degradation, is mediated by the CCR4-NOT complex.
- Cytoplasmic poly(A)-binding protein PABPC1 typically protects mRNA from decay.
Purpose of the Study:
- To investigate the interaction mechanisms between tristetraprolin, CCR4-NOT, and PABPC1.
- To elucidate how these interactions control mRNA stability and degradation.
- To understand the role of tristetraprolin phosphorylation in these processes.
Main Methods:
- In vitro biochemical assays using purified proteins.
- Analysis of protein-protein interactions.
- Assessment of mRNA deadenylation and degradation rates.
Main Results:
- Tristetraprolin binds CCR4-NOT through multiple sites, enhancing its deadenylation activity.
- Tristetraprolin phosphorylation is not required for CCR4-NOT interaction or deadenylation.
- Phosphorylation is essential for tristetraprolin binding to PABPC1.
Conclusions:
- Tristetraprolin promotes processive deadenylation by CCR4-NOT on specific mRNAs.
- Phosphorylation-dependent PABPC1 interaction may further enhance deadenylation and regulated mRNA decay.
- This study reveals a complex regulatory mechanism for mRNA stability involving tristetraprolin family proteins.
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