4WU9

Structure of cisPtNAP-NCP145


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 

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Literature

Stereochemical control of nucleosome targeting by platinum-intercalator antitumor agents.

Chua, E.Y.Davey, G.E.Chin, C.F.Droge, P.Ang, W.H.Davey, C.A.

(2015) Nucleic Acids Res 43: 5284-5296

  • DOI: https://doi.org/10.1093/nar/gkv356
  • Primary Citation of Related Structures:  
    4WU8, 4WU9

  • PubMed Abstract: 

    Platinum-based anticancer drugs act therapeutically by forming DNA adducts, but suffer from severe toxicity and resistance problems, which have not been overcome in spite of decades of research. And yet defined chromatin targets have generally not been considered in the drug development process. Here we designed novel platinum-intercalator species to target a highly deformed DNA site near the nucleosome center. Between two seemingly similar structural isomers, we find a striking difference in DNA site selectivity in vitro, which comes about from stereochemical constraints that limit the reactivity of the trans isomer to special DNA sequence elements while still allowing the cis isomer to efficiently form adducts at internal sites in the nucleosome core. This gives the potential for controlling nucleosome site targeting in vivo, which would engender sensitivity to epigenetic distinctions and in particular cell type/status-dependent differences in nucleosome positioning. Moreover, while both compounds yield very similar DNA-adduct structures and display antitumor cell activity rivalling that of cisplatin, the cis isomer, relative to the trans, has a much more rapid cytotoxic effect and distinct impact on cell function. The novel stereochemical principles for controlling DNA site selectivity we discovered could aid in the design of improved site discriminating agents.


  • Organizational Affiliation

    School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H3.2
A, E
135Xenopus laevisMutation(s): 1 
UniProt
Find proteins for P84233 (Xenopus laevis)
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UniProt GroupP84233
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H4
B, F
102Xenopus laevisMutation(s): 0 
UniProt
Find proteins for P62799 (Xenopus laevis)
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UniProt GroupP62799
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H2A type 1
C, G
129Xenopus laevisMutation(s): 2 
UniProt
Find proteins for P06897 (Xenopus laevis)
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UniProt GroupP06897
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H2B 1.1
D, H
125Xenopus laevisMutation(s): 1 
UniProt
Find proteins for P02281 (Xenopus laevis)
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UniProt GroupP02281
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  • Reference Sequence
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Entity ID: 5
MoleculeChains LengthOrganismImage
DNA (145-MER)145synthetic construct
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Entity ID: 6
MoleculeChains LengthOrganismImage
DNA (145-MER)145synthetic construct
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 106.57α = 90
b = 109.33β = 90
c = 181.28γ = 90
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-02
    Type: Initial release
  • Version 1.1: 2024-03-20
    Changes: Data collection, Database references, Derived calculations