Crystal structure of a two-quartet RNA parallel G-quadruplex complexed with the porphyrin TMPyP4

Experimental Data Snapshot

  • Resolution: 1.74 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.242 

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Native de novo structural determinations of non-canonical nucleic acid motifs by X-ray crystallography at long wavelengths.

Zhang, Y.El Omari, K.Duman, R.Liu, S.Haider, S.Wagner, A.Parkinson, G.N.Wei, D.

(2020) Nucleic Acids Res 48: 9886-9898

  • DOI: https://doi.org/10.1093/nar/gkaa439
  • Primary Citation of Related Structures:  
    6JJF, 6JJH, 6JJI, 6TQI

  • PubMed Abstract: 

    Obtaining phase information remains a formidable challenge for nucleic acid structure determination. The introduction of an X-ray synchrotron beamline designed to be tunable to long wavelengths at Diamond Light Source has opened the possibility to native de novo structure determinations by the use of intrinsic scattering elements. This provides opportunities to overcome the limitations of introducing modifying nucleotides, often required to derive phasing information. In this paper, we build on established methods to generate new tools for nucleic acid structure determinations. We report on the use of (i) native intrinsic potassium single-wavelength anomalous dispersion methods (K-SAD), (ii) use of anomalous scattering elements integral to the crystallization buffer (extrinsic cobalt and intrinsic potassium ions), (iii) extrinsic bromine and intrinsic phosphorus SAD to solve complex nucleic acid structures. Using the reported methods we solved the structures of (i) Pseudorabies virus (PRV) RNA G-quadruplex and ligand complex, (ii) PRV DNA G-quadruplex, and (iii) an i-motif of human telomeric sequence. Our results highlight the utility of using intrinsic scattering as a pathway to solve and determine non-canonical nucleic acid motifs and reveal the variability of topology, influence of ligand binding, and glycosidic angle rearrangements seen between RNA and DNA G-quadruplexes of the same sequence.

  • Organizational Affiliation

    College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.


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Entity ID: 1
MoleculeChains LengthOrganismImage
RNA (5'-R(*GP*GP*CP*UP*CP*GP*GP*CP*GP*GP*CP*GP*GP*A)-3')A [auth B]14Pseudorabies virus Ea
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.74 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.242 
  • Space Group: P 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 29.856α = 90
b = 23.647β = 107.59
c = 31.052γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata scaling
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31672558

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-26
    Type: Initial release
  • Version 1.1: 2020-09-09
    Changes: Database references, Derived calculations
  • Version 1.2: 2020-10-07
    Changes: Database references