3NJ7

1.9 A resolution X-ray structure of (GGCAGCAGCC)2

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.904 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


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

Literature

Atomic resolution structure of CAG RNA repeats: structural insights and implications for the trinucleotide repeat expansion diseases.

Kiliszek, A., Kierzek, R., Krzyzosiak, W.J., Rypniewski, W.

(2010) Nucleic Acids Res. 38: 8370-8376

  • DOI: 10.1093/nar/gkq700
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • CAG repeats occur predominantly in the coding regions of human genes, which suggests their functional importance. In some genes, these sequences can undergo pathogenic expansions leading to neurodegenerative polyglutamine (poly-Q) diseases. The mutan ...

    CAG repeats occur predominantly in the coding regions of human genes, which suggests their functional importance. In some genes, these sequences can undergo pathogenic expansions leading to neurodegenerative polyglutamine (poly-Q) diseases. The mutant transcripts containing expanded CAG repeats possibly contribute to pathogenesis in addition to the well-known pathogenic effects of mutant proteins. We have analysed two crystal forms of RNA duplexes containing CAG repeats: (GGCAGCAGCC)(2). One of the structures has been determined at atomic resolution (0.95 Å) and the other at 1.9 Å. The duplexes include non-canonical A-A pairs that fit remarkably well within a regular A-helix. All the adenosines are in the anti-conformation and the only interaction within each A-A pair is a single C2-H2···N1 hydrogen bond. Both adenosines in each A-A pair are shifted towards the major groove, although to different extents; the A which is the H-bond donor stands out more (the 'thumbs-up' conformation). The main effect on the helix conformation is a local unwinding. The CAG repeats and the previously examined CUG structures share a similar pattern of electrostatic charge distribution in the minor groove, which could explain their affinity for the pathogenesis-related MBNL1 protein.

    Organizational Affiliation: 

    Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12/14, 61-704 Poznan, Poland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
5'-R(*GP*GP*CP*AP*GP*CP*AP*GP*CP*C)-3'A,B,C,D,E,F10N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4
Download SDF File 
Download CCD File 
A, B, C, D, E
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.904 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.212 
  • Space Group: P 32
Unit Cell:
Length (Å)Angle (°)
a = 47.366α = 90.00
b = 47.366β = 90.00
c = 83.209γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
MAR345data collection
PHASERphasing
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-08-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-11-08
    Type: Refinement description