5IYG

Comparison of X-ray crystal structures of a tetradecamer sequence d(CCCGGGTACCCGGG)2 at 1.7 resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.701 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Comparison of X-ray crystal structures of a tetradecamer sequence d(CCCGGGTACCCGGG)2 at 1.7 angstrom resolution.

Karthik, S.Thirugnanasambandam, A.Mandal, P.K.Gautham, N.

(2017) Nucleosides Nucleotides Nucleic Acids 36: 343-354

  • DOI: 10.1080/15257770.2017.1287378
  • Primary Citation of Related Structures:  5IYE, 5IYJ

  • PubMed Abstract: 
  • We present here a comparison of three different X-ray crystal structures of DNA tetradecamer sequence d(CCCGGGTACCCGGG)2 all at about 1.7 Å resolution. The sequence was designed as an attempt to form a DNA four-way junction with A-type helical arms. ...

    We present here a comparison of three different X-ray crystal structures of DNA tetradecamer sequence d(CCCGGGTACCCGGG)2 all at about 1.7 Å resolution. The sequence was designed as an attempt to form a DNA four-way junction with A-type helical arms. However, in the presence of zinc, magnesium, and in the absence of any metal ion, it does not take up the junction structure, but forms an A-type double helix. This allowed us to study possible conformational changes in the double helix due to the presence of metal ions. Upon addition of the zinc ion, there is a change in the space group from P41212 to P41. The overall conformation of the duplex remains the same. There are small changes in the interaction of the metal ions with the DNA. In the zinc-bound structure, there are two zinc ions that show direct interaction with the N7 atoms of terminal G13 bases at either end of the molecule. There are small changes in the interhelical contacts. The consequence of these differences is to break some of the symmetry and change the space group.


    Organizational Affiliation

    a CAS in Crystallography and Biophysics , University of Madras , Guindy Campus, Chennai , Tamil Nadu , India.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
DNA (5'-D(*CP*CP*CP*GP*GP*GP*TP*AP*CP*CP*CP*GP*GP*G)-3')A,B14synthetic construct
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.701 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.214 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 41.463α = 90.00
b = 41.463β = 90.00
c = 88.724γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing
XDSdata processing
PDB_EXTRACTdata extraction
MxCuBEdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-03-29
    Type: Initial release
  • Version 1.1: 2017-04-19
    Type: Database references
  • Version 1.2: 2017-12-06
    Type: Database references