3QX3

Human topoisomerase IIbeta in complex with DNA and etoposide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structural basis of type II topoisomerase inhibition by the anticancer drug etoposide

Wu, C.C.Li, T.K.Farh, L.Lin, L.Y.Lin, T.S.Yu, Y.J.Yen, T.J.Chiang, C.W.Chan, N.L.

(2011) Science 333: 459-462

  • DOI: 10.1126/science.1204117
  • Primary Citation of Related Structures:  
    3QX3

  • PubMed Abstract: 
  • Type II topoisomerases (TOP2s) resolve the topological problems of DNA by transiently cleaving both strands of a DNA duplex to form a cleavage complex through which another DNA segment can be transported. Several widely prescribed anticancer drugs increase the population of TOP2 cleavage complex, which leads to TOP2-mediated chromosome DNA breakage and death of cancer cells ...

    Type II topoisomerases (TOP2s) resolve the topological problems of DNA by transiently cleaving both strands of a DNA duplex to form a cleavage complex through which another DNA segment can be transported. Several widely prescribed anticancer drugs increase the population of TOP2 cleavage complex, which leads to TOP2-mediated chromosome DNA breakage and death of cancer cells. We present the crystal structure of a large fragment of human TOP2β complexed to DNA and to the anticancer drug etoposide to reveal structural details of drug-induced stabilization of a cleavage complex. The interplay between the protein, the DNA, and the drug explains the structure-activity relations of etoposide derivatives and the molecular basis of drug-resistant mutations. The analysis of protein-drug interactions provides information applicable for developing an isoform-specific TOP2-targeting strategy.


    Organizational Affiliation

    Institute of Biochemistry and Molecular Biology, College of Medicine, National Taiwan University, Taipei City 100, Taiwan.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA topoisomerase 2-betaA, B803Homo sapiensMutation(s): 0 
Gene Names: TOP2B
EC: 5.99.1.3 (PDB Primary Data), 5.6.2.2 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q02880 (Homo sapiens)
Explore Q02880 
Go to UniProtKB:  Q02880
PHAROS:  Q02880
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(P*AP*GP*CP*CP*GP*AP*GP*C)-3')C, E8N/A
    Protein Feature View
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    • Reference Sequence
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(P*TP*GP*CP*AP*GP*CP*TP*CP*GP*GP*CP*T)-3')D, F12N/A
      Protein Feature View
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      • Reference Sequence
      Small Molecules
      Ligands 2 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      EVP (Subject of Investigation/LOI)
      Query on EVP

      Download Ideal Coordinates CCD File 
      G [auth A], L [auth D](5S,5aR,8aR,9R)-9-(4-hydroxy-3,5-dimethoxyphenyl)-8-oxo-5,5a,6,8,8a,9-hexahydrofuro[3',4':6,7]naphtho[2,3-d][1,3]dioxol -5-yl 4,6-O-[(1R)-ethylidene]-beta-D-glucopyranoside
      C29 H32 O13
      VJJPUSNTGOMMGY-MRVIYFEKSA-N
       Ligand Interaction
      MG
      Query on MG

      Download Ideal Coordinates CCD File 
      H [auth A], I [auth A], J [auth B], K [auth B], M [auth D], N [auth F]MAGNESIUM ION
      Mg
      JLVVSXFLKOJNIY-UHFFFAOYSA-N
       Ligand Interaction
      Binding Affinity Annotations 
      IDSourceBinding Affinity
      EVP BindingDB:  3QX3 IC50: min: 70, max: 790 (nM) from 2 assay(s)
      EC50: 7.00e+4 (nM) from 1 assay(s)
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.16 Å
      • R-Value Free: 0.207 
      • R-Value Work: 0.168 
      • R-Value Observed: 0.170 
      • Space Group: P 1 21 1
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 80.149α = 90
      b = 176.801β = 111.58
      c = 94.067γ = 90
      Software Package:
      Software NamePurpose
      Blu-Icedata collection
      PHENIXmodel building
      PHENIXrefinement
      HKL-2000data reduction
      HKL-2000data scaling
      PHENIXphasing

      Structure Validation

      View Full Validation Report



      Ligand Structure Quality Assessment  



      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2011-07-06
        Type: Initial release
      • Version 1.1: 2011-07-13
        Changes: Version format compliance
      • Version 1.2: 2012-01-25
        Changes: Database references