NMR solution structure of the C/D box snoRNA U14

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the least restraint violations 

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The yeast C/D box snoRNA U14 adopts a "weak" K-turn like conformation recognized by the Snu13 core protein in solution.

Chagot, M.E.Quinternet, M.Rothe, B.Charpentier, B.Coutant, J.Manival, X.Lebars, I.

(2019) Biochimie 164: 70-82

  • DOI: https://doi.org/10.1016/j.biochi.2019.03.014
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Non-coding RNAs associate with proteins to form ribonucleoproteins (RNPs), such as ribosome, box C/D snoRNPs, H/ACA snoRNPs, ribonuclease P, telomerase and spliceosome to ensure cell viability. The assembly of these RNA-protein complexes relies on the ability of the RNA to adopt the correct bound conformation. K-turn motifs represent ubiquitous binding platform for proteins found in several cellular environment. This structural motif has an internal three-nucleotide bulge flanked on its 3' side by a G•A/A•G tandem pairs followed by one or two non-Watson-Crick pairs, and on its 5' side by a classical RNA helix. This peculiar arrangement induces a strong curvature of the phosphodiester backbone, which makes it conducive to multiple tertiary interactions. SNU13/Snu13p (Human/Yeast) binds specifically the U14 C/D box snoRNA K-turn sequence motif. This event is the prerequisite to promote the assembly of the RNP, which contains NOP58/Nop58 and NOP56/Nop56 core proteins and the 2'-O-methyl-transferase, Fibrillarin/Nop1p. The U14 small nucleolar RNA is a conserved non-coding RNA found in yeast and vertebrates required for the pre-rRNA maturation and ribose methylation. Here, we report the solution structure of the free U14 snoRNA K-turn motif (kt-U14) as determined by Nuclear Magnetic Resonance. We demonstrate that a major fraction of free kt-U14 adopts a pre-folded conformation similar to protein bound K-turn, even in the absence of divalent ions. In contrast to the kt-U4 or tyrS RNA, kt-U14 displays a sharp bent in the phosphodiester backbone. The U•U and G•A tandem base pairs are formed through weak hydrogen bonds. Finally, we show that the structure of kt-U14 is stabilized upon Snu13p binding. The structure of the free U14 RNA is the first reference example for the canonical motifs of the C/D box snoRNA family.

  • Organizational Affiliation

    CNRS, IMoPA, Université de Lorraine, Nancy, F-54000, France.

Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains LengthOrganismImage
RNA (31-MER)31synthetic construct
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
French National Research AgencyFranceANR-16-CE11-0032-02

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-24
    Type: Initial release
  • Version 1.1: 2019-05-08
    Changes: Data collection
  • Version 1.2: 2019-08-21
    Changes: Data collection, Database references
  • Version 1.3: 2023-06-14
    Changes: Database references, Other