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Novel protein-protein contacts facilitate mRNA 3'-processing signal recognition by Rna15 and Hrp1

Thomas C Leeper1, Xiangping Qu, Connie Lu

  • 1Department of Chemistry, University of Washington, Seattle, WA 98195-1700, USA. tleeper@uakron.edu

Journal of Molecular Biology
|July 6, 2010
PubMed

Insights

Precise mRNA 3'-end processing in yeast relies on specific RNA-binding proteins. This study reveals the structural basis of these interactions, uncovering novel protein contacts crucial for gene expression regulation.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • Accurate messenger RNA (mRNA) 3 -end processing is vital for gene expression.
  • Yeast mRNA 3 -processing signals involve ambiguous sequences and RNA-binding proteins.
  • Rna15 and Hrp1 proteins bind to positioning and efficiency elements, respectively, crucial for 3 -processing accuracy and efficiency.

Purpose of the Study:

  • To determine the NMR structure of the ternary complex formed by Hrp1, Rna15, and RNA elements.
  • To elucidate the binding mechanisms of Hrp1 and Rna15 to RNA.
  • To identify and characterize novel protein-protein interactions within the complex.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Residual dipolar coupling (RDC) analysis.
  • Paramagnetic relaxation enhancement (PRE) experiments.

Main Results:

  • The study determined the 3D structure of the Hrp1-Rna15-RNA complex.
  • It revealed how Hrp1 and Rna15 bind to specific RNA elements.
  • Novel interdomain protein-protein contacts were identified in previously uncharacterized regions.

Conclusions:

  • The identified protein-protein contacts are critical for organizing ribonucleoprotein complexes involved in mRNA 3 -end processing.
  • These contacts may be a common feature in multi-RRM protein structures.
  • Disrupting these contacts impairs 3 -end processing, highlighting their functional significance.

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