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Structural Basis for Target-Directed MicroRNA Degradation.

Jessica Sheu-Gruttadauria1, Paulina Pawlica2, Shannon M Klum1

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Molecular Cell
|July 30, 2019
PubMed
Summary
This summary is machine-generated.

Target-directed miRNA degradation (TDMD) uses target RNAs to trigger microRNA (miRNA) decay. Structural studies reveal how target binding bends miRNA-Argonaute complexes, exposing the miRNA 3' end for degradation.

Keywords:
ArgonauteHSUR1TDMDmiRNAmiRNA-degradationmicroRNAtailingtrimming

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • MicroRNAs (miRNAs) are crucial regulators of gene expression, interacting with Argonaute (Ago) proteins.
  • miRNA stability is variable and influenced by poorly understood mechanisms, including target-directed miRNA degradation (TDMD).

Purpose of the Study:

  • To elucidate the structural mechanism of target-directed miRNA degradation (TDMD) mediated by human Ago2 (hAgo2).
  • To understand how target RNAs induce miRNA decay and identify factors regulating this process.

Main Methods:

  • X-ray crystallography to determine the structures of hAgo2 bound to miRNAs and TDMD-inducing targets.
  • Biochemical assays to assess the impact of structural modifications on TDMD efficiency.

Main Results:

  • Structures reveal that miRNA-target binding creates a bipartite duplex with a flexible linker, causing hAgo2 to bend.
  • This bending exposes the miRNA 3' end for enzymatic degradation.
  • Modifications to linker flexibility, 3' end complementarity, or 3' end release alter TDMD efficiency and generate distinct 3'-miRNA isoforms.

Conclusions:

  • The study uncovers the molecular mechanism driving TDMD, highlighting the critical role of 3' end display.
  • miRNA 3' end accessibility is a key determinant of miRNA activity, influencing remodeling and degradation pathways.