4GZ2

Mus Musculus Tdp2 excluded ssDNA complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Mechanism of repair of 5'-topoisomerase II-DNA adducts by mammalian tyrosyl-DNA phosphodiesterase 2.

Schellenberg, M.J.Appel, C.D.Adhikari, S.Robertson, P.D.Ramsden, D.A.Williams, R.S.

(2012) Nat Struct Mol Biol 19: 1363-1371

  • DOI: 10.1038/nsmb.2418
  • Primary Citation of Related Structures:  
    4GYZ, 4GZ0, 4GZ1, 4GZ2

  • PubMed Abstract: 
  • The topoisomerase II (topo II) DNA incision-and-ligation cycle can be poisoned (for example following treatment with cancer chemotherapeutics) to generate cytotoxic DNA double-strand breaks (DSBs) with topo II covalently conjugated to DNA. Tyrosyl-DNA phosphodiesterase 2 (Tdp2) protects genomic integrity by reversing 5'-phosphotyrosyl-linked topo II-DNA adducts ...

    The topoisomerase II (topo II) DNA incision-and-ligation cycle can be poisoned (for example following treatment with cancer chemotherapeutics) to generate cytotoxic DNA double-strand breaks (DSBs) with topo II covalently conjugated to DNA. Tyrosyl-DNA phosphodiesterase 2 (Tdp2) protects genomic integrity by reversing 5'-phosphotyrosyl-linked topo II-DNA adducts. Here, X-ray structures of mouse Tdp2-DNA complexes reveal that Tdp2 β-2-helix-β DNA damage-binding 'grasp', helical 'cap' and DNA lesion-binding elements fuse to form an elongated protein-DNA conjugate substrate-interaction groove. The Tdp2 DNA-binding surface is highly tailored for engagement of 5'-adducted single-stranded DNA ends and restricts nonspecific endonucleolytic or exonucleolytic processing. Structural, mutational and functional analyses support a single-metal ion catalytic mechanism for the exonuclease-endonuclease-phosphatase (EEP) nuclease superfamily and establish a molecular framework for targeted small-molecule blockade of Tdp2-mediated resistance to anticancer topoisomerase drugs.


    Organizational Affiliation

    Laboratory of Structural Biology, National Institute of Environmental Health Sciences, US National Institutes of Health, Department of Health and Human Services, North Carolina, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tyrosyl-DNA phosphodiesterase 2A,
C [auth B]
255Mus musculusMutation(s): 0 
Gene Names: Tdp2Ttrap
EC: 3.1.4
UniProt
Find proteins for Q9JJX7 (Mus musculus)
Explore Q9JJX7 
Go to UniProtKB:  Q9JJX7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9JJX7
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*CP*AP*TP*CP*CP*GP*AP*AP*TP*TP*CP*G)-3')D [auth C],
B [auth D]
12N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.483α = 90
b = 42.972β = 95.89
c = 107.951γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
DENZOdata reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-31
    Type: Initial release
  • Version 1.1: 2012-11-21
    Changes: Database references
  • Version 1.2: 2012-11-28
    Changes: Database references
  • Version 1.3: 2013-01-02
    Changes: Database references
  • Version 1.4: 2020-07-22
    Changes: Database references, Derived calculations