6H5R

Structure of the complex of a human telomeric DNA with bis(1-butyl-3-methyl-imidazole-2-ylidene) gold(I)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 

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Literature

Interaction of a gold(i) dicarbene anticancer drug with human telomeric DNA G-quadruplex: solution and computationally aided X-ray diffraction analysis.

Guarra, F.Marzo, T.Ferraroni, M.Papi, F.Bazzicalupi, C.Gratteri, P.Pescitelli, G.Messori, L.Biver, T.Gabbiani, C.

(2018) Dalton Trans 47: 16132-16138

  • DOI: 10.1039/c8dt03607a
  • Primary Citation of Related Structures:  
    6H5R

  • PubMed Abstract: 
  • The bis carbene gold(i) complex [Au(1-butyl-3-methyl-2-ylidene)2]PF6, ([Au(NHC)2]PF6 hereafter), holds remarkable interest as a perspective anticancer agent. The compound is stable under physiological like conditions: its original structure is retained even in the presence of excess glutathione (GSH) ...

    The bis carbene gold(i) complex [Au(1-butyl-3-methyl-2-ylidene)2]PF6, ([Au(NHC)2]PF6 hereafter), holds remarkable interest as a perspective anticancer agent. The compound is stable under physiological like conditions: its original structure is retained even in the presence of excess glutathione (GSH). Previous studies revealed its high cytotoxicity in vitro that correlates with the impairment of crucial metabolic and enzymatic cellular processes (Magherini et al., Oncotarget, 2018, 9, 28042). Here, the interaction of [Au(NHC)2]PF6 with the human telomeric DNA G-quadruplex Tel23 has been investigated in solution by means of high resolution mass spectrometry. ESI MS experiments well document the formation of stable 1 : 1 adducts between the biscarbene gold complex - in its intact form - and the DNA G-quadruplex Tel23. Next, through independent biophysical methods, we show that [Au(NHC)2]PF6 binding does not significantly affect the G quadruplex melting temperature nor its conformation. The crystal structure for the [Au(NHC)2]+/Tel24 adduct was eventually determined by a joint X-ray diffraction and in silico simulation approach. Through the careful integration of solution and solid-state data, a quite clear picture emerges for the interaction of this gold complex with the Tel23 G-quadruplex.


    Organizational Affiliation

    Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy. chiara.gabbiani@unipi.it.



Macromolecules
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Entity ID: 1
MoleculeChainsLengthOrganismImage
Human Telomeric DNAA24Homo sapiens
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.6α = 90
b = 71.37β = 92.42
c = 27.05γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
MOLREPphasing
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-30
    Type: Initial release