1YN2

Solution structure of the Neurospora VS ribozyme stem-loop V in the presence of MgCl2 with modeling of bound manganese ions


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 46 
  • Conformers Submitted: 11 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

NMR structure of varkud satellite ribozyme stem-loop v in the presence of magnesium ions and localization of metal-binding sites

Campbell, D.O.Bouchard, P.Desjardins, G.Legault, P.

(2006) Biochemistry 45: 10591-10605

  • DOI: 10.1021/bi0607150
  • Primary Citation of Related Structures:  
    1YN1, 1YN2

  • PubMed Abstract: 
  • In the Neurospora VS ribozyme, magnesium ions facilitate formation of a loop-loop interaction between stem-loops I and V, which is important for recognition and activation of the stem-loop I substrate. Here, we present the high-resolution NMR structure of stem-loop V (SL5) in the presence of Mg(2+) (SL5(Mg)) and demonstrate that Mg(2+) induces a conformational change in which the SL5 loop adopts a compact structure with most characteristics of canonical U-turn structures ...

    In the Neurospora VS ribozyme, magnesium ions facilitate formation of a loop-loop interaction between stem-loops I and V, which is important for recognition and activation of the stem-loop I substrate. Here, we present the high-resolution NMR structure of stem-loop V (SL5) in the presence of Mg(2+) (SL5(Mg)) and demonstrate that Mg(2+) induces a conformational change in which the SL5 loop adopts a compact structure with most characteristics of canonical U-turn structures. Divalent cation-binding sites were probed with Mn(2+)-induced paramagnetic line broadening and intermolecular NOEs to Co(NH(3))(6)(3+). Structural modeling of Mn(H(2)O)(6)(2+) in SL5(Mg) revealed four divalent cation-binding sites in the loop. Sites 1, 3, and 4 are located in the major groove near multiple phosphate groups, whereas site 2 is adjacent to N7 of G697 and N7 of A698 in the minor groove. Cation-binding sites equivalent to sites 1-3 in SL5 are present in other U-turn motifs, and these metal-binding sites may represent a common feature of the U-turn fold. Although magnesium ions affect the loop conformation, they do not significantly change the conformation of residues 697-699 involved in the proposed Watson-Crick base pairs with stem-loop I. In both the presence and the absence of Mg(2+), G697, A698, and C699 adopt an A-form structure that exposes their Watson-Crick faces, and this is compatible with their proposed interaction with stem-loop I. In SL5(Mg), however, U700 becomes exposed on the minor groove face of the loop in the proximity of the bases of G697, A698, and C699, suggesting that the Mg(2+)-bound conformation of stem-loop V allows additional contacts with stem-loop I. These studies improve our understanding of the role of Mg(2+) in U-turn structures and in substrate recognition by the VS ribozyme.


    Related Citations: 
    • NMR Structure of the VS Ribozyme Stem-Loop V RNA and Magnesium-Ion Binding from Chemical-Shift Mapping
      Campbell, D.O., Legault, P.
      (2005) To be published --: --

    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, USA.



Macromolecules
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    VS RIBOZYME STEM-LOOP VA17N/A
    Protein Feature View
    Expand
    • Reference Sequence
    Small Molecules
    Ligands 1 Unique
    IDChainsName / Formula / InChI Key2D Diagram3D Interactions
    MN
    Query on MN

    Download Ideal Coordinates CCD File 
    B [auth A], C [auth A], D [auth A], E [auth A]MANGANESE (II) ION
    Mn
    WAEMQWOKJMHJLA-UHFFFAOYSA-N
     Ligand Interaction
    Experimental Data & Validation

    Experimental Data

    • Method: SOLUTION NMR
    • Conformers Calculated: 46 
    • Conformers Submitted: 11 
    • Selection Criteria: structures with the lowest energy 
    • OLDERADO: 1YN2 Olderado

    Structure Validation

    View Full Validation Report




    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 2006-01-24
      Type: Initial release
    • Version 1.1: 2008-04-30
      Changes: Version format compliance
    • Version 1.2: 2011-07-13
      Changes: Version format compliance