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Updated: Feb 8, 2026

Measurement of mRNA Decay Rates in Saccharomyces cerevisiae Using rpb1-1 Strains
Published on: December 13, 2014
PABP Cooperates with the CCR4-NOT Complex to Promote mRNA Deadenylation and Block Precocious Decay
Hyerim Yi1, Joha Park1, Minju Ha1
1Center for RNA Research, Institute for Basic Science, Seoul 08826, Korea; School of Biological Sciences, Seoul National University, Seoul 08826, Korea.
The CCR4-NOT (CNOT) complex is a major deadenylase for cytoplasmic RNAs. Poly(A) binding protein (PABP) aids deadenylation, preventing premature decay and uridylation.
Area of Science:
- Molecular Biology
- RNA Biology
- Biochemistry
Background:
- Vertebrates possess multiple deadenylases: PAN2-PAN3 (PAN2/3), CCR4-NOT (CNOT), and PARN.
- The specific roles of these deadenylases and poly(A) binding protein (PABP) in mRNA deadenylation are not fully understood.
Purpose of the Study:
- To elucidate the distinct functions of deadenylase complexes (CNOT, PAN2/3, PARN) in mRNA deadenylation.
- To clarify the role of PABP in the deadenylation process and its interplay with deadenylases.
Main Methods:
- Investigated deadenylation activities of CNOT, PAN2/3, and PARN complexes in vitro.
- Analyzed the impact of PABP on deadenylation by CAF1 and CCR4 subunits.
- Characterized the trimming of poly(A) tails by different deadenylases.
Main Results:
- CNOT acts as a predominant nonspecific deadenylase for cytoplasmic poly(A)+ RNAs.
- PABP promotes deadenylation and prevents premature uridylation and decay.
- PAN2/3 selectively trims long poly(A) tails (>150 nt) with limited transcriptome-wide impact.
- PARN does not significantly affect mRNA deadenylation.
- CAF1 trims naked poly(A) tails, inhibited by PABP; CCR4 is activated by PABP.
- CAF1 and CCR4 actions define PABP footprints on shortening poly(A) tails.
Conclusions:
- Distinct roles of deadenylases (CNOT, PAN2/3, PARN) and PABP in mRNA deadenylation are revealed.
- The interplay between PABP and CNOT subunits (CAF1, CCR4) dictates poly(A) tail shortening dynamics.
- This study redefines the understanding of mRNA deadenylation mechanisms and regulation.
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