1J6S

Crystal Structure of an RNA Tetraplex (UGAGGU)4 with A-tetrads, G-tetrads, U-tetrads and G-U octads


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.166 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of an RNA purine-rich tetraplex containing adenine tetrads: implications for specific binding in RNA tetraplexes

Pan, B.Xiong, Y.Shi, K.Deng, J.Sundaralingam, M.

(2003) Structure 11: 815-823

  • DOI: 10.1016/s0969-2126(03)00107-2
  • Primary Citation of Related Structures:  
    1J6S

  • PubMed Abstract: 
  • Purine-rich regions in DNA and RNA may contain both guanines and adenines, which have various biological functions. Here we report the crystal structure of an RNA purine-rich fragment containing both guanine and adenine at 1.4 A resolution. Adenines form an adenine tetrad in the N6-H em leader N7 conformation ...

    Purine-rich regions in DNA and RNA may contain both guanines and adenines, which have various biological functions. Here we report the crystal structure of an RNA purine-rich fragment containing both guanine and adenine at 1.4 A resolution. Adenines form an adenine tetrad in the N6-H em leader N7 conformation. Substitution of an adenine tetrad in the guanine tetraplex does not change the global conformation but introduces irregularity in both the hydrogen bonding interaction pattern in the groove and the metal ion binding pattern in the central cavity of the tetraplex. The irregularity in groove binding may be critical for specific binding in tetraplexes. The formation of G-U octads provides a mechanism for interaction in the groove. Ba(2+) ions prefer to bind guanine tetrads, and adenine tetrads can only be bound by Na(+) ions, illustrating the binding selectivity of metal ions for the tetraplex.


    Organizational Affiliation

    Departments of Chemistry and Biochemistry, The Ohio State University, 200 Johnston Lab, 176 West 19th Avenue, Columbus, OH 43210, USA.



Macromolecules

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChainsLengthOrganismImage
5'-R(*(BRUP*GP*AP*GP*GP*U)-3'A, B, C, D 6N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BA
Query on BA

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
I [auth B],
J [auth B],
M [auth C],
E [auth A],
F [auth A],
I [auth B],
J [auth B],
M [auth C],
N [auth C],
R [auth D],
S [auth D]
BARIUM ION
Ba
XDFCIPNJCBUZJN-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
G [auth A],
H [auth A],
K [auth B],
L [auth B],
O [auth C],
G [auth A],
H [auth A],
K [auth B],
L [auth B],
O [auth C],
P [auth C],
Q [auth C],
T [auth D]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.166 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.984α = 90
b = 37.984β = 90
c = 82.195γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SOLVEphasing
RESOLVEmodel building
CNSrefinement
RESOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-08-05
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance