1CW9

DNA DECAMER WITH AN ENGINEERED CROSSLINK IN THE MINOR GROOVE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

A structural snapshot of base-pair opening in DNA.

van Aalten, D.M.Erlanson, D.A.Verdine, G.L.Joshua-Tor, L.

(1999) Proc.Natl.Acad.Sci.USA 96: 11809-11814


  • PubMed Abstract: 
  • The response of double-helical DNA to torsional stress may be a driving force for many processes acting on DNA. The 1.55-A crystal structure of a duplex DNA oligonucleotide d(CCAGGCCTGG)(2) with an engineered crosslink in the minor groove between the ...

    The response of double-helical DNA to torsional stress may be a driving force for many processes acting on DNA. The 1.55-A crystal structure of a duplex DNA oligonucleotide d(CCAGGCCTGG)(2) with an engineered crosslink in the minor groove between the central guanine bases depicts how the duplex can accommodate such torsional stress. We have captured in the same crystal two rather different conformational states. One duplex contains a strained crosslink that is stabilized by calcium ion binding in the major groove, directly opposite the crosslink. For the other duplex, the strain in the crosslink is relieved through partial rupture of a base pair and partial extrusion of a cytosine accompanied by helix bending. The sequence used is the target sequence for the HaeIII methylase, and this partially flipped cytosine is the same nucleotide targeted for extrusion by the enzyme. Molecular dynamics simulations of these structures show an increased mobility for the partially flipped-out cytosine.


    Organizational Affiliation

    W. M. Keck Structural Biology Laboratory, Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
5'-D(*CP*CP*AP*GP*(G47)P*CP*CP*TP*GP*G)-3'A,B,C,D10N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
G47
Query on G47
A, B, C, D
DNA LINKINGC12 H18 N5 O7 P SDG
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 34.435α = 90.00
b = 43.180β = 90.00
c = 72.412γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
SCALEPACKdata scaling
MAR345data collection
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-10-14
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-02-01
    Type: Structure summary
  • Version 1.4: 2017-10-04
    Type: Refinement description