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DNAzyme-dependent Analysis of rRNA 2’-O-Methylation
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The structure of the box C/D enzyme reveals regulation of RNA methylation

Audrone Lapinaite1, Bernd Simon, Lars Skjaerven

  • 1European Molecular Biology Laboratory, Structural and Computational Biology Unit, Meyerhofstrasse 1, D-69117 Heidelberg, Germany.

Nature
|October 15, 2013
PubMed

Insights

This study reveals how the box C/D ribonucleoprotein (RNP) enzyme uses guide RNAs to methylate ribosomal RNA (rRNA). The structure shows sequential methylation, offering new insights into rRNA folding and modification control.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Post-transcriptional modifications are crucial for cellular processes, including pre-ribosomal RNA (rRNA) processing and ribosome assembly.
  • The box C/D ribonucleoprotein (RNP) enzyme catalyzes 2'-O-ribose methylation of rRNA, utilizing guide RNAs for target recognition.

Purpose of the Study:

  • To elucidate the structural basis for the function of the box C/D RNP enzyme.
  • To understand the role of dual methylation guide sequences on guide RNAs in rRNA modification and folding.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to determine high-resolution structures.
  • Small-angle neutron scattering (SANS) to analyze the overall shape and arrangement of the complex.
  • Biochemical assays to study substrate binding and methylation activity.

Main Results:

  • The 390 kDa archaeal RNP enzyme complexed with substrate RNA was structurally characterized.
  • Two distinct methylation guide sequences on the same guide RNA occupy different environments within the complex.
  • Methylation of rRNA sites targeted by a single guide RNA occurs in a sequential manner.

Conclusions:

  • The structural organization allows for differential control over rRNA methylation levels at distinct sites.
  • The findings reveal an unexpected regulatory mechanism for rRNA folding mediated by the RNP complex.
  • This work provides critical insights into the precise regulation of ribosome biogenesis and function.

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