1DN8

STRUCTURE OF A Z-DNA WITH TWO DIFFERENT BACKBONE CHAIN CONFORMATIONS. STABILIZATION OF THE DECADEOXYOLIGONUCLEOTIDE D(CGTACGTACG) BY (CO(NH3)6)3+ BINDING TO THE GUANINE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a Z-DNA with two different backbone chain conformations. Stabilization of the decadeoxyoligonucleotide d(CGTACGTACG) by [Co(NH3)6]3+ binding to the guanine.

Brennan, R.G.Westhof, E.Sundaralingam, M.

(1986) J.Biomol.Struct.Dyn. 3: 649-665

  • DOI: 10.1080/07391102.1986.10508453

  • PubMed Abstract: 
  • The complex between cobalt hexammine and decadeoxyoligomer d(CGTACGTACG) crystallizes into the space group P65 with unit cell constants a = b = 17.93A, and c = 43.41A. The molecules have the helix axis coincident with the crystal c-axis. The decamers ...

    The complex between cobalt hexammine and decadeoxyoligomer d(CGTACGTACG) crystallizes into the space group P65 with unit cell constants a = b = 17.93A, and c = 43.41A. The molecules have the helix axis coincident with the crystal c-axis. The decamers stack on top of each other and form a quasi-continuous helix. The structure is disordered. The asymmetric unit is a dimer (pPyr-pPur)2 with each base pair 60% of the time a C-G and 40% of the time a T-A. Restrainted least-squares refinement led to an R-factor of 25.5% for 506 observed reflections above the two-sigma level. The structure was found to have one strand in the ZI-conformation and the other in the ZII-conformation. The cobalt hexammine binds to two ZII-chains of symmetrically related molecules. On one ZII chain, two ammonia molecules of the cobalt hexammine bind to the N7 nitrogen and 06 oxygen atoms of the guanine bases and a third ammonia to the phosphate anionic oxygen atom of the preceding pyrimidine base, resulting in an "external" binding mode. On the other ZII chain, one ammonia molecule of the cobalt hexammine binds only to the anionic oxygens of the phosphate group of the guanine bases, leading to an "internal" binding mode. Thus, the basis of the stabilization of Z-DNA by [Co(NH3)6]3+ is its binding to only guanine nucleotides. It is surmised that statistical disordering of deoxyoligonucleotide structures which take a Z conformation, depends on the length of the oligomer. That is to say, octamers and decamers (which cannot use an integral number of molecules for a 12 base pair repeat) form disordered structures whereas tetramers and hexamers form well ordered structures.


    Related Citations: 
    • Crystallization and Preliminary Crystallographic Studies of the Decadeoxyoligonucleotide d(CpGpTpApCpGpTpApCpG)
      Brennan, R.G.,Sundaralingam, M.
      (1985) J.Mol.Biol. 181: 561


    Organizational Affiliation

    Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin, Madison 53706.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
DNA (5'-D(*P*CP*GP*TP*AP*CP*GP*TP*AP*CP*G)-3')A,B2N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NCO
Query on NCO

Download SDF File 
Download CCD File 
B
COBALT HEXAMMINE(III)
Co H18 N6
DYLMFCCYOUSRTK-FGTKAUEHAT
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 17.930α = 90.00
b = 17.930β = 90.00
c = 43.410γ = 120.00
Software Package:
Software NamePurpose
NUCLSQrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1988-04-16
    Type: Initial release
  • Version 1.1: 2008-05-22
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance