4E48

Structure of 20mer double-helical RNA composed of CUG/CUG-repeats

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.207 

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This is version 1.2 of the entry. See complete history. 


Literature

Structural dynamics of double-helical RNAs composed of CUG/CUG- and CUG/CGG-repeats.

Tamjar, J., Katorcha, E., Popov, A., Malinina, L.

(2012) J Biomol Struct Dyn 30: 505-523

  • DOI: 10.1080/07391102.2012.687517
  • Primary Citation of Related Structures:  
    4E48, 4E5C, 4E6B

  • PubMed Abstract: 

    • Human genetic trinucleotide repeat expansion diseases (TREDs) are characterized by triplet repeat expansions, most frequently found as CNG-tracts in genome. At RNA level, such expansions suggestively result in formation of double-helical hairpins that become a potential source for small RNAs involved in RNA interference (RNAi) ...

    Human genetic trinucleotide repeat expansion diseases (TREDs) are characterized by triplet repeat expansions, most frequently found as CNG-tracts in genome. At RNA level, such expansions suggestively result in formation of double-helical hairpins that become a potential source for small RNAs involved in RNA interference (RNAi). Here, we present three crystal structures of RNA fragments composed of triplet repeats CUG and CGG/CUG, as well as two crystal structures of same triplets in a protein-bound state. We show that both 20mer pG(CUG)(6)C and 19mer pGG(CGG)(3)(CUG)(2)CC form A-RNA duplexes, in which U·U or G·U mismatches are flanked/stabilized by two consecutive Watson-Crick G·C base pairs resulting in high-stacking GpC steps in every third position of the duplex. Despite interruption of this regularity in another 19mer, p(CGG)(3)C(CUG)(3), the oligonucleotide still forms regular double-helical structure, characterized, however, by 12 bp (rather than 11 bp) per turn. Analysis of newly determined molecular structures reveals the dynamic aspects of U·U and G·U mismatching within CNG-repetitive A-RNA and in a protein-bound state, as well as identifies an additional mode of U·U pairing essential for its dynamics and sheds the light on possible role of regularity of trinucleotide repeats for double-helical RNA structure. Findings are important for understanding the structural behavior of CNG-repetitive RNA double helices implicated in TREDs.

    Organizational Affiliation: 

    Structural Biology Unit, CIC bioGUNE, Technology Park of Bizkaia, Derio-Bilbao 48160, Spain.



Macromolecules

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Entity ID: 1
MoleculeChainsLengthOrganismImage
5'-R(P*GP*CP*UP*GP*CP*UP*GP*CP*UP*GP*CP*UP*GP*CP*UP*GP*CP*UP*GP*C)-3'A,
B,
C [auth D]		20N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.207 
  • Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.642α = 90
b = 43.642β = 90
c = 158.556γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
PROTEUM PLUSdata collection
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-07-11
    Type: Initial release
  • Version 1.1: 2012-08-29
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description