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AUF1 binding affinity to A+U-rich elements correlates with rapid mRNA degradation
1Department of Microbiology and Immunology, Bowman Gray School of Medicine of Wake Forest University, Winston-Salem, North Carolina 27157-1064, USA.
The Journal of Biological Chemistry
|May 24, 1996
Summary
The RNA-binding protein AUF1 binds to A+U-rich elements (AREs) in messenger RNAs. Higher binding affinity of AUF1 to specific AREs correlates with faster mRNA degradation, supporting its role in regulating gene expression.
Area of Science:
- Molecular Biology
- Gene Regulation
- RNA Metabolism
Background:
- Many short-lived messenger RNAs (mRNAs) are rapidly degraded.
- This degradation is often controlled by A+U-rich elements (AREs) in the 3'-untranslated regions of mRNAs.
- A specific nonamer motif (UUAUUUAUU) within AREs is crucial for mRNA destabilization.
Purpose of the Study:
- To investigate the role of trans-acting factors in ARE-directed mRNA degradation.
- To characterize the in vitro RNA-binding properties of the RNA-binding protein AUF1.
- To determine if AUF1's binding affinity to AREs correlates with mRNA decay rates.
Main Methods:
- Purification and molecular cloning of the RNA-binding protein AUF1.
- UV cross-linking assays to demonstrate AUF1 binding to AREs.
- Gel mobility shift assays using purified recombinant His6-AUF1 fusion protein to assess binding affinities.
Main Results:
- AUF1 specifically binds to AREs in vitro.
- The binding affinities of AUF1 to different AREs were quantified.
- AUF1 binding affinities positively correlated with the potency of AREs in directing mRNA degradation.
Conclusions:
- AUF1 plays a significant role in ARE-directed mRNA decay.
- AUF1's function in mRNA degradation is dependent on its binding affinity to specific ARE sequences.
- These findings provide insights into the mechanisms of post-transcriptional gene regulation.