4PUQ

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.171 
  • R-Value Work: 0.129 

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

  • 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) a ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tyrosyl-DNA phosphodiesterase 2
A, B
256Mus musculusMutation(s): 0 
Gene Names: Tdp2 (Ttrap)
EC: 3.1.4.-
Find proteins for Q9JJX7 (Mus musculus)
Go to UniProtKB:  Q9JJX7
Entity ID: 2
MoleculeChainsLengthOrganism
DNA/RNA hybridC,D9N/A
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
D
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
B, D
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.171 
  • R-Value Work: 0.129 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 54.828α = 90.00
b = 69.258β = 90.00
c = 167.107γ = 90.00
Software Package:
Software NamePurpose
PHENIXphasing
SCALEPACKdata scaling
DENZOdata reduction
PDB_EXTRACTdata extraction
SERGUIdata collection
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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