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Poly(A)-binding proteins (PABPs) are crucial for mRNA function, influencing processes from creation to decay. This review details PABP roles in nuclear and cytoplasmic mRNA events and their regulation.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • RNA-binding proteins are essential for messenger RNA (mRNA) functionality.
  • Poly(A)-binding proteins (PABPs) are key players due to their high affinity for A-rich mRNA sequences.
  • PABPs interact with numerous proteins, mediating diverse cellular events.

Purpose of the Study:

  • To review the multifaceted roles of PABPs in mRNA-dependent cellular processes.
  • To discuss the regulation of PABP levels and activities within the cell.
  • To provide modern insights into PABP functions in both nuclear and cytoplasmic mRNA metabolism.

Main Methods:

  • Literature review of current research on PABPs.
  • Analysis of PABP interactions with mRNA and other proteins.
  • Examination of PABP functions in mRNA polyadenylation, export, translation, and decay.

Main Results:

  • PABPs are involved in virtually all mRNA-dependent events.
  • Nuclear PABPs contribute to polyadenylation, poly(A) tail length determination, and mRNA export.
  • Cytoplasmic PABPs regulate translation initiation and mRNA stability, either protecting or promoting decay.

Conclusions:

  • PABPs are central regulators of mRNA fate, impacting multiple stages of gene expression.
  • Understanding PABP regulation is critical for comprehending cellular mRNA dynamics.
  • This review consolidates current knowledge on PABP functions and their regulatory mechanisms.