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Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC
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Substrate RNA positioning in the archaeal H/ACA ribonucleoprotein complex.

Bo Liang1, Song Xue, Rebecca M Terns

  • 1Institute of Molecular Biophysics, 91 Chiefton Way, Florida State University, Tallahasee, Florida 32306, USA.

Nature Structural & Molecular Biology
|December 7, 2007
PubMed
Summary

The H/ACA ribonucleoprotein complex, a complex RNA pseudouridylase, uses guide RNA and proteins to modify RNA. This study reveals the structure of this enzyme complex bound to substrate RNA, detailing its precise positioning for catalysis.

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Area of Science:

  • Structural Biology
  • RNA Biology
  • Biochemistry

Background:

  • H/ACA ribonucleoprotein particles are complex RNA pseudouridylases essential for RNA modification.
  • These particles utilize guide RNA for substrate capture and four core proteins (Cbf5, Nop10, Gar1, L7Ae/NHP2) for catalysis.

Purpose of the Study:

  • To determine the three-dimensional structure of a catalytically deficient archaeal H/ACA enzyme complex bound to a substrate RNA.
  • To elucidate the molecular mechanisms underlying substrate RNA capture and positioning within the H/ACA complex.

Main Methods:

  • Three-dimensional structural analysis of the archaeal H/ACA enzyme complex.
  • Integration of structural data with complementary fluorescence analyses.

Main Results:

  • The structure reveals extensive interactions between the Cbf5 protein, guide RNA, and substrate RNA, forming a forked complex.
  • Precise positioning of the target uridine at the Cbf5 catalytic center is facilitated by specific guide RNA conformations and protein-protein interactions (L7Ae, Cbf5-Nop10).
  • A critical residue involved in substrate positioning was identified.

Conclusions:

  • The study provides atomic-level insights into the structural basis of H/ACA ribonucleoprotein particle function.
  • Understanding these interactions is crucial for comprehending RNA pseudouridylation and its biological significance.