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microRNA-binding proteins: specificity and function

Richard W Zealy1, Samuel P Wrenn1, Sylvia Davila1

  • 1Department of Biochemistry and Molecular Biology, College of Medicine, Medical University of South Carolina, Charleston, SC, USA.

Wiley Interdisciplinary Reviews. RNA
|January 29, 2017
PubMed

Insights

RNA-binding proteins (RBPs) and microRNAs (miRNAs) regulate gene expression. Novel miRNA-binding proteins (miRBPs) interact with AGO-free miRNAs, revealing new insights into miRNA-mediated gene silencing.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Biochemistry

Background:

  • MicroRNAs (miRNAs) and RNA-binding proteins (RBPs) are key regulators of post-transcriptional gene expression.
  • Research has elucidated how miRNAs and RBPs modulate mRNA decay and translation, and their interplay.
  • Emerging evidence shows direct interactions between RBPs and mature miRNAs beyond AGO-family proteins.

Purpose of the Study:

  • To review recent discoveries of novel miRNA-binding proteins (miRBPs).
  • To provide a new perspective on miRNA-mediated gene silencing mechanisms.
  • To highlight the emerging role of AGO-free cytoplasmic miRNAs complexing with miRBPs.

Main Methods:

  • Literature review of recent studies on miRNA-RBP interactions.
  • Analysis of emerging findings on novel miRBPs.
  • Synthesis of current knowledge on miRNA-mediated gene silencing pathways.

Main Results:

  • Certain RBPs directly interact with mature miRNAs, influencing miRNA-AGO association.
  • Mechanisms include competitive binding, miRNA sequestration from AGO, promotion of AGO binding, and miRNA transfer.
  • AGO-free cytoplasmic miRNAs form complexes with novel miRBPs, expanding the known regulatory network.

Conclusions:

  • Novel miRBPs represent a significant addition to the understanding of miRNA function.
  • These interactions offer new perspectives on the complexity of miRNA-mediated gene silencing.
  • The discovery of AGO-free miRNA complexes broadens the scope of post-transcriptional regulation.

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