3IRQ

Crystal structure of a Z-Z junction


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.235 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structure of a junction between two Z-DNA helices.

de Rosa, M.de Sanctis, D.Rosario, A.L.Archer, M.Rich, A.Athanasiadis, A.Carrondo, M.A.

(2010) Proc.Natl.Acad.Sci.USA 107: 9088-9092

  • DOI: 10.1073/pnas.1003182107
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The double helix of DNA, when composed of dinucleotide purine-pyrimidine repeats, can adopt a left-handed helical structure called Z-DNA. For reasons not entirely understood, such dinucleotide repeats in genomic sequences have been associated with ge ...

    The double helix of DNA, when composed of dinucleotide purine-pyrimidine repeats, can adopt a left-handed helical structure called Z-DNA. For reasons not entirely understood, such dinucleotide repeats in genomic sequences have been associated with genomic instability leading to cancer. Adoption of the left-handed conformation results in the formation of conformational junctions: A B-to-Z junction is formed at the boundaries of the helix, whereas a Z-to-Z junction is commonly formed in sequences where the dinucleotide repeat is interrupted by single base insertions or deletions that bring neighboring helices out of phase. B-Z junctions are shown to result in exposed nucleotides vulnerable to chemical or enzymatic modification. Here we describe the three-dimensional structure of a Z-Z junction stabilized by Zalpha, the Z-DNA binding domain of the RNA editing enzyme ADAR1. We show that the junction structure consists of a single base pair and leads to partial or full disruption of the helical stacking. The junction region allows intercalating agents to insert themselves into the left-handed helix, which is otherwise resistant to intercalation. However, unlike a B-Z junction, in this structure the bases are not fully extruded, and the stacking between the two left-handed helices is not continuous.


    Organizational Affiliation

    Instituto Gulbenkian de Ciência, Rua da Quinta Grande, 6 P-2780-156 Oeiras, Portugal.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Double-stranded RNA-specific adenosine deaminase
D, C, B, A
67Homo sapiensMutation(s): 0 
Gene Names: ADAR (ADAR1, DSRAD, G1P1, IFI4)
EC: 3.5.4.37
Find proteins for P55265 (Homo sapiens)
Go to Gene View: ADAR
Go to UniProtKB:  P55265
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*TP*CP*GP*CP*GP*CP*GP*TP*CP*GP*CP*GP*CP*G)-3')G15N/A
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*AP*CP*CP*GP*CP*GP*CP*GP*AP*CP*GP*CP*GP*CP*G)-3')F15N/A
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.235 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 29.283α = 90.00
b = 99.761β = 90.00
c = 106.482γ = 90.00
Software Package:
Software NamePurpose
DNAdata collection
MOSFLMdata reduction
SCALAdata scaling
PHENIXrefinement
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-05-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance