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Related Experiment Videos

Solution structure of conserved AGNN tetraloops: insights into Rnt1p RNA processing.

I Lebars1, B Lamontagne, S Yoshizawa

  • 1Laboratoire de RMN, ICSN-CNRS, 1 ave de la terrasse, F-91190 Gif-sur-Yvette, France.

The EMBO Journal
|December 18, 2001
PubMed
Summary

Yeast RNase III (Rnt1p) enzyme specifically cleaves RNA molecules. It recognizes the conserved fold of single-stranded tetraloops, not just their sequence, to direct RNA processing.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA Processing

Background:

  • Rnt1p, the yeast RNase III orthologue, is crucial for processing various RNA molecules like rRNAs, snRNAs, and snoRNAs.
  • This enzyme typically cleaves RNA at stem structures capped by conserved AGNN tetraloops.

Purpose of the Study:

  • To investigate the structural basis of Rnt1p's substrate recognition beyond the conserved AGNN tetraloop.
  • To determine if Rnt1p can recognize and cleave RNA with different tetraloop sequences.

Main Methods:

  • Solution structure determination of RNA tetraloops (AGAA and AGUC).
  • In vitro RNA cleavage assays using Rnt1p and engineered RNA substrates.
  • Analysis of Rnt1p-tetraloop interactions.

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Main Results:

  • Rnt1p binds to and cleaves RNA substrates with 9 bp stems ending in AGAA or AGUC tetraloops, provided the stem exceeds 13 bp.
  • Solution structures reveal a common tetraloop fold stabilized by non-canonical base pairs (A-A, A-C) and base stacking.
  • Conserved nucleotides are positioned at the 5' side, exposing specific faces for Rnt1p recognition.

Conclusions:

  • Yeast RNase III (Rnt1p) recognizes the conserved three-dimensional fold of single-stranded tetraloops for specific double-stranded RNA cleavage.
  • This recognition mechanism allows for sequence-independent cleavage directed by the tetraloop's structure.