5T7L

Pt(II)-mediated copper-dependent interactions between ATOX1 and MNK1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.83 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Mechanistic and Structural Basis for Inhibition of Copper Trafficking by Platinum Anticancer Drugs.

Lasorsa, A.Nardella, M.I.Rosato, A.Mirabelli, V.Caliandro, R.Caliandro, R.Natile, G.Arnesano, F.

(2019) J.Am.Chem.Soc. 141: 12109-12120

  • DOI: 10.1021/jacs.9b05550

  • PubMed Abstract: 
  • Copper (Cu) is required for maturation of cuproenzymes, cell proliferation, and angiogenesis, and its transport entails highly specific protein-protein interactions. In humans, the Cu chaperone Atox1 mediates Cu(I) delivery to P-type ATPases Atp7a an ...

    Copper (Cu) is required for maturation of cuproenzymes, cell proliferation, and angiogenesis, and its transport entails highly specific protein-protein interactions. In humans, the Cu chaperone Atox1 mediates Cu(I) delivery to P-type ATPases Atp7a and Atp7b (the Menkes and Wilson disease proteins, respectively), which are responsible for Cu release to the secretory pathway and excess Cu efflux. Cu(I) handover is believed to occur through the formation of three-coordinate intermediates where the metal ion is simultaneously linked to Atox1 and to a soluble domain of Cu-ATPases, both sharing a CxxC dithiol motif. The ultrahigh thermodynamic stability of chelating S-donor ligands secures the redox-active and potentially toxic Cu(I) ion, while their kinetic lability allows facile metal transfer. The same CxxC motifs can interact with and mediate the biological response to antitumor platinum drugs, which are among the most used chemotherapeutics. We show that cisplatin and an oxaliplatin analogue can specifically bind to the heterodimeric complex Atox1-Cu(I)-Mnk1 (Mnk1 is the first soluble domain of Atp7a), thus leading to a kinetically stable adduct that has been structurally characterized by solution NMR and X-ray crystallography. Of the two possible binding configurations of the Cu(I) ion in the cage made by the CxxC motifs of the two proteins, one (bidentate Atox1 and monodentate Mnk1) is less stable and more reactive toward cis -Pt(II) compounds, as shown by using mutated proteins. A Cu(I) ion can be retained at the Pt(II) coordination site but can be released to glutathione (a physiological thiol) or to other complexing agents. The Pt(II)-supported heterodimeric complex does not form if Zn(II) is used in place of Cu(I) and transplatin instead of cisplatin. The results indicate that Pt(II) drugs can specifically affect Cu(I) homeostasis by interfering with the rapid exchange of Cu(I) between Atox1 and Cu-ATPases with consequences on cancer cell viability and migration.


    Organizational Affiliation

    Department of Chemistry , University of Bari "Aldo Moro" , via Orabona, 4 , 70125 Bari , Italy.,Institute of Crystallography, CNR , Area Science Park Basovizza , 34149 Trieste , Italy.,Bioorganic Chemistry and Bio-Crystallography laboratory (B(2)Cl), Faculty of Science and Technology , Free University of Bolzano , Piazza Università 5 , 39100 Bolzano , Italy.,Institute of Crystallography, CNR , via Amendola, 122/o , 70126 Bari , Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Copper transport protein ATOX1
A
68Homo sapiensMutation(s): 0 
Gene Names: ATOX1 (HAH1)
Find proteins for O00244 (Homo sapiens)
Go to Gene View: ATOX1
Go to UniProtKB:  O00244
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Copper-transporting ATPase 1
B
75Homo sapiensMutation(s): 0 
Gene Names: ATP7A (MC1, MNK)
EC: 7.2.2.8
Find proteins for Q04656 (Homo sapiens)
Go to Gene View: ATP7A
Go to UniProtKB:  Q04656
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PT
Query on PT

Download SDF File 
Download CCD File 
A
PLATINUM (II) ION
Pt
HRGDZIGMBDGFTC-UHFFFAOYSA-N
 Ligand Interaction
CU
Query on CU

Download SDF File 
Download CCD File 
A
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.83 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.200 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 47.617α = 90.00
b = 54.659β = 90.00
c = 63.719γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
Sir2014phasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-10-12
    Type: Initial release
  • Version 1.1: 2019-09-04
    Type: Data collection, Database references