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An Optimized Quantitative Pull-Down Analysis of RNA-Binding Proteins Using Short Biotinylated RNA
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Characterizing TDP-43 interaction with its RNA targets.

Amit Bhardwaj1, Michael P Myers, Emanuele Buratti

  • 1International Centre for Genetic Engineering and Biotechnology (ICGEB), 34012 Trieste, Italy.

Nucleic Acids Research
|March 23, 2013
PubMed
Summary

Nuclear factor TDP-43 binds UG-rich RNA sequences, including those in its own 3'UTR, essential for autoregulation. This study quantifies TDP-43 binding affinity to these UG-like sequences versus perfect UG-repeats.

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Area of Science:

  • Molecular Biology
  • RNA-binding proteins
  • Gene regulation

Background:

  • Nuclear factor TDP-43 is crucial for cellular function.
  • TDP-43 binds UG-repeats with high efficiency.
  • TDP-43 also binds loosely conserved UG/GU-rich repeats in introns and 3'UTRs.

Purpose of the Study:

  • To compare the binding affinity of TDP-43 to UG-like sequences versus perfect UG-stretches.
  • To map the interaction region between TDP-43 and these RNA sequences.
  • To understand the role of UG-rich sequences in TDP-43 autoregulation.

Main Methods:

  • Cross-linking and immunoprecipitation (CLIP) followed by sequencing (RIP-seq).
  • Quantitative binding assays to determine dissociation constants (Kd).
  • RNA-protein interaction mapping.

Main Results:

  • TDP-43 exhibits a dissociation constant (Kd) of ~110 nM for UG-like sequences, compared to 8 nM for perfect UG-stretches.
  • The region of contact between TDP-43 and RNA was mapped.
  • Local concentration of UG dinucleotides influences TDP-43 RNA interaction.

Conclusions:

  • TDP-43 binding affinity is sequence-dependent, with a preference for perfect UG-repeats.
  • UG-like sequences in the TDP-43 3'UTR are critical for its negative feedback autoregulation.
  • The study provides insights into TDP-43's regulatory mechanisms through RNA binding specificity.