4PUQ

Mus Musculus Tdp2 reaction product complex with 5'-phosphorylated RNA/DNA, glycerol, and Mg2+


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.171 
  • R-Value Work: 0.129 
  • R-Value Observed: 0.131 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Proteolytic Degradation of Topoisomerase II (Top2) Enables the Processing of Top2DNA and Top2RNA Covalent Complexes by Tyrosyl-DNA-Phosphodiesterase 2 (TDP2).

Gao, R.Schellenberg, M.J.Huang, S.Y.Abdelmalak, M.Marchand, C.Nitiss, K.C.Nitiss, J.L.Williams, R.S.Pommier, Y.

(2014) J Biol Chem 289: 17960-17969

  • DOI: 10.1074/jbc.M114.565374
  • Primary Citation of Related Structures:  
    4PUQ

  • PubMed Abstract: 
  • Eukaryotic type II topoisomerases (Top2α and Top2β) are homodimeric enzymes; they are essential for altering DNA topology by the formation of normally transient double strand DNA cleavage. Anticancer drugs (etoposide, doxorubicin, and mitoxantrone) and also Top2 oxidation and DNA helical alterations cause potentially irreversible Top2·DNA cleavage complexes (Top2cc), leading to Top2-linked DNA breaks ...

    Eukaryotic type II topoisomerases (Top2α and Top2β) are homodimeric enzymes; they are essential for altering DNA topology by the formation of normally transient double strand DNA cleavage. Anticancer drugs (etoposide, doxorubicin, and mitoxantrone) and also Top2 oxidation and DNA helical alterations cause potentially irreversible Top2·DNA cleavage complexes (Top2cc), leading to Top2-linked DNA breaks. Top2cc are the therapeutic mechanism for killing cancer cells. Yet Top2cc can also generate recombination, translocations, and apoptosis in normal cells. The Top2 protein-DNA covalent complexes are excised (in part) by tyrosyl-DNA-phosphodiesterase 2 (TDP2/TTRAP/EAP2/VPg unlinkase). In this study, we show that irreversible Top2cc induced in suicidal substrates are not processed by TDP2 unless they first undergo proteolytic processing or denaturation. We also demonstrate that TDP2 is most efficient when the DNA attached to the tyrosyl is in a single-stranded configuration and that TDP2 can efficiently remove a tyrosine linked to a single misincorporated ribonucleotide or to polyribonucleotides, which expands the TDP2 catalytic profile with RNA substrates. The 1.6-Å resolution crystal structure of TDP2 bound to a substrate bearing a 5'-ribonucleotide defines a mechanism through which RNA can be accommodated in the TDP2 active site, albeit in a strained conformation.


    Organizational Affiliation

    From the Laboratory of Molecular Pharmacology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892, pommier@nih.gov.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tyrosyl-DNA phosphodiesterase 2A, B256Mus 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/RNA hybridC, D 9N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.171 
  • R-Value Work: 0.129 
  • R-Value Observed: 0.131 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.828α = 90
b = 69.258β = 90
c = 167.107γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
SERGUIdata collection
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-05-14
    Type: Initial release
  • Version 1.1: 2014-06-25
    Changes: Database references
  • Version 1.2: 2014-07-23
    Changes: Database references