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Tailing Off: PABP and CNOT Generate Cycles of mRNA Deadenylation

Stefan Bresson1, David Tollervey1

  • 1Wellcome Centre for Cell Biology, University of Edinburgh, Edinburgh, EH9 3BF, UK.

Molecular Cell
|June 23, 2018
PubMed

Insights

The Ccr4-Not (CNOT) complex regulates mRNA deadenylation. Poly(A) binding protein (Pab1/PABPC1) plays a dual role, stimulating and suppressing deadenylase activity to control mRNA decay.

Area of Science:

  • Molecular biology
  • Gene regulation
  • RNA metabolism

Background:

  • Cytoplasmic mRNA deadenylation is a critical step in post-transcriptional gene regulation.
  • The Ccr4-Not (CNOT) complex is a key regulator of mRNA deadenylation.
  • Poly(A) binding proteins (Pab1/PABPC1) are known to interact with deadenylase complexes.

Purpose of the Study:

  • To elucidate the precise mechanisms by which the Ccr4-Not (CNOT) complex mediates cytoplasmic mRNA deadenylation.
  • To investigate the specific roles of poly(A) binding protein Pab1/PABPC1 in modulating CNOT complex activity.
  • To understand how Pab1/PABPC1 differentially affects the activity of various deadenylases within the CNOT complex.

Main Methods:

  • Biochemical assays to measure deadenylase activity.
  • In vitro reconstitution of the CNOT complex.
  • Analysis of protein-protein interactions between CNOT components and Pab1/PABPC1.
  • RNA binding studies.

Main Results:

  • Webster et al. and Yi et al. provide detailed mechanistic insights into CNOT-mediated deadenylation.
  • Pab1/PABPC1 demonstrates a dual regulatory function, acting as both a stimulator and suppressor of deadenylase activity.
  • The specific effect of Pab1/PABPC1 depends on the particular deadenylase enzyme within the CNOT complex.

Conclusions:

  • Pab1/PABPC1 is a crucial factor that fine-tunes mRNA deadenylation by the CNOT complex.
  • The intricate interplay between Pab1/PABPC1 and CNOT components provides a sophisticated layer of gene expression control.
  • Understanding these mechanisms is vital for comprehending mRNA stability and turnover in eukaryotic cells.

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