7D5E

Left-handed G-quadruplex containing two bulges


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Bulges in left-handed G-quadruplexes.

Das, P.Ngo, K.H.Winnerdy, F.R.Maity, A.Bakalar, B.Mechulam, Y.Schmitt, E.Phan, A.T.

(2021) Nucleic Acids Res 49: 1724-1736

  • DOI: https://doi.org/10.1093/nar/gkaa1259
  • Primary Citation of Related Structures:  
    7D5D, 7D5E, 7D5F

  • PubMed Abstract: 

    G-quadruplex (G4) DNA structures with a left-handed backbone progression have unique and conserved structural features. Studies on sequence dependency of the structures revealed the prerequisites and some minimal motifs required for left-handed G4 formation. To extend the boundaries, we explore the adaptability of left-handed G4s towards the existence of bulges. Here we present two X-ray crystal structures and an NMR solution structure of left-handed G4s accommodating one, two and three bulges. Bulges in left-handed G4s show distinct characteristics as compared to those in right-handed G4s. The elucidation of intricate structural details will help in understanding the possible roles and limitations of these unique structures.


  • Organizational Affiliation

    School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.


Macromolecules
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains LengthOrganismImage
2xBulge-LHG4motif
A, B
28synthetic construct
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SPM
Query on SPM

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
L [auth B],
M [auth B]
SPERMINE
C10 H26 N4
PFNFFQXMRSDOHW-UHFFFAOYSA-N
K
Query on K

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
H [auth B]
I [auth B]
C [auth A],
D [auth A],
E [auth A],
H [auth B],
I [auth B],
J [auth B],
K [auth B]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
N [auth B]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 29.1α = 90
b = 39.81β = 91.28
c = 54.97γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Research Foundation (NRF, Singapore)SingaporeNRF-NRFI2017-09

Revision History  (Full details and data files)

  • Version 1.0: 2021-02-10
    Type: Initial release
  • Version 1.1: 2021-03-03
    Changes: Database references
  • Version 1.2: 2023-11-29
    Changes: Data collection, Database references, Refinement description