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Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
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Binding affinity and cooperativity control U2B″/snRNA/U2A' RNP formation.

Sandra G Williams1, Kathleen B Hall

  • 1Department of Biochemistry and Molecular Biophysics, Washington University Medical School , St. Louis, Missouri 63110, United States.

Biochemistry
|May 29, 2014
PubMed
Summary
This summary is machine-generated.

The U2A’ protein tightly binds U2B″, forming a complex that specifically targets the U2 snRNP. This RNA-dependent cooperativity ensures precise localization of the U2A’/U2B″ complex within the spliceosome.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • U1A and U2B″ proteins are essential components of U1 and U2 small nuclear ribonucleoproteins (snRNPs).
  • While U1A and U2B″ localization to their respective snRNPs is established, U2B″ binding to U2 snRNA is often associated with the U2A' protein.

Purpose of the Study:

  • To investigate the molecular mechanisms governing the formation of the RNA/U2B″/U2A' complex.
  • To elucidate how this complex is specifically localized to the U2 snRNP.

Main Methods:

  • In vitro RNA-protein binding assays.
  • In vitro protein-protein binding assays.
  • Fluorescence spectroscopy and isothermal titration calorimetry (ITC).

Main Results:

  • U2A' protein exhibits high affinity (nanomolar) for U2B″ but lower affinity (micromolar) for U1A.
  • RNA-dependent cooperativity was observed between protein-protein and protein-RNA interactions.
  • This interplay ensures selective partitioning of the U2A'/U2B″ complex to the U2 snRNP.

Conclusions:

  • The specific binding affinities and RNA-dependent cooperativity are critical for the accurate assembly of the U2 snRNP.
  • These mechanisms prevent mislocalization of the U2A'/U2B″ complex to other snRNPs like U1.