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Complicated target recognition by archaeal box C/D guide RNAs.

Jiayin Wang1,2, Songlin Wu1,2, Keqiong Ye3,4

  • 1Key Laboratory of RNA Science and Engineering, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.

Science China. Life Sciences
|December 2, 2023
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Summary

This study reveals how Box C/D RNAs guide 2''-O-methylation in the archaeon Sulfolobus islandicus. Unexpected targeting rules were discovered, including dual antisense elements and double-specificity, expanding our understanding of RNA modification.

Keywords:
2′-O-methylationC/D RNARNA modificationarchaeaguide RNA

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Area of Science:

  • * Molecular Biology
  • * RNA Biology
  • * Genomics

Background:

  • * Box C/D RNAs are crucial for guiding 2 '-O-methylation (Nm) in RNAs across eukaryotes and archaea.
  • * While C/D RNA presence is known in many archaea, their specific RNA targets remain largely uncharacterized.
  • * Understanding these interactions is key to deciphering RNA regulation and function in archaeal systems.

Purpose of the Study:

  • * To comprehensively map 2 '-O-methylation sites across various RNA types (rRNAs, tRNAs, sRNAs) in Sulfolobus islandicus.
  • * To identify and characterize the Box C/D RNAs responsible for guiding these modifications.
  • * To elucidate the rules governing C/D RNA-target interactions in this archaeon.

Main Methods:

  • * Comprehensive profiling of 2 '-O-methylated nucleotides (Nm) in S. islandicus.
  • * Identification and characterization of Box C/D RNAs within the S. islandicus genome.
  • * Determination of C/D RNA targets through base-pairing analysis, in vitro modification assays, and gene deletion experiments.

Main Results:

  • * A detailed map of Nm sites in S. islandicus rRNAs, tRNAs, and abundant small RNAs was generated.
  • * The study identified specific C/D RNAs and their corresponding RNA targets, revealing complex interaction patterns.
  • * Novel targeting strategies were observed, including dual antisense elements for rRNA modification and double-specificity phenomena unique to internal box D' elements.

Conclusions:

  • * This research provides the first global view of RNA-guided 2 '-O-methylation in an archaeon.
  • * The findings uncover unexpected and intricate targeting rules employed by Box C/D RNAs, expanding the known mechanisms of RNA modification.
  • * The study lays the groundwork for further investigation into the functional implications of these modifications in archaeal biology.