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Protein Extract Preparation and Co-immunoprecipitation from Caenorhabditis elegans
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mRNA structural dynamics shape Argonaute-target interactions.

Suzan Ruijtenberg1,2, Stijn Sonneveld1, Tao Ju Cui3

  • 1Oncode Institute, Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, the Netherlands.

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Small interfering RNAs (siRNAs) degrade RNA, but target site accessibility is key. Ribosomes unmask target sites, overcoming RNA-RNA interactions that block Argonaute2 (AGO2) binding and cleavage.

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Area of Science:

  • Molecular Biology
  • RNA Interference
  • Biochemistry

Background:

  • Small interfering RNAs (siRNAs) are crucial for RNA degradation and have clinical relevance.
  • siRNAs function by guiding Argonaute2 (AGO2) to target RNA sequences for cleavage.
  • Understanding in vivo control of target site accessibility for AGO2 is limited.

Purpose of the Study:

  • To investigate the in vivo dynamics of the AGO2 cleavage cycle.
  • To determine the rate-limiting steps in messenger RNA (mRNA) cleavage mediated by AGO2.
  • To elucidate the role of mRNA structural dynamics in AGO2-target recognition.

Main Methods:

  • Live-cell single-molecule imaging in human cells.
  • Quantification of rate constants for the AGO2 cleavage cycle.
  • Analysis of mRNA target site accessibility and unmasking dynamics.

Main Results:

  • The rate-limiting step in mRNA cleavage often involves target site unmasking by translating ribosomes.
  • Heterogeneous intramolecular RNA-RNA interactions can mask target sites for extended periods.
  • Dynamic mRNA structural changes significantly influence AGO2-target recognition.

Conclusions:

  • Ribosome activity is critical for overcoming mRNA structural barriers to AGO2 binding.
  • mRNA folding and unfolding rates in vivo impact gene silencing efficiency.
  • mRNA structural dynamics play a vital role in regulating mRNA-protein interactions, including siRNA-mediated silencing.