5OLD

X-ray structure of the adduct formed upon reaction of ribonuclease A with a tetranuclear Pt-thiosemicarbazone compound


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 

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This is version 1.1 of the entry. See complete history


Literature

Reactions of a tetranuclear Pt-thiosemicarbazone complex with model proteins.

Marzo, T.Navas, F.Cirri, D.Merlino, A.Ferraro, G.Messori, L.Quiroga, A.G.

(2018) J Inorg Biochem 181: 11-17

  • DOI: 10.1016/j.jinorgbio.2018.01.002
  • Primary Citation of Related Structures:  
    5OLE, 5OLD

  • PubMed Abstract: 
  • The tetranuclear Pt complex (PtL) 4 (where L 2- is the anion derived from para-isopropyl thiosemicarbazone) was first described in A.G. Quiroga et al., J. Med. Chem. 41, 1998, 1399-1408. (PtL) 4 manifests antiproliferative properties toward various cancer cell lines being a promising anticancer drug candidate ...

    The tetranuclear Pt complex (PtL) 4 (where L 2- is the anion derived from para-isopropyl thiosemicarbazone) was first described in A.G. Quiroga et al., J. Med. Chem. 41, 1998, 1399-1408. (PtL) 4 manifests antiproliferative properties toward various cancer cell lines being a promising anticancer drug candidate. Yet, details of its reactivity with biomolecules have not been elucidated. To this end, we investigated the reactions of (PtL) 4 with a few model proteins, i.e. bovine pancreatic ribonuclease (RNase A), cytochrome c (Cyt c) and hen egg white lysozyme (Lysozyme), through electrospray ionization mass spectrometry and other biophysical methods. A rich reactivity of (PtL) 4 with the above-mentioned model proteins is observed, leading to the formation of numerous metallodrug-protein adducts. The tetranuclear complex breaks down and various fragments bind proteins up to high metal/protein ratios; this typically results into very complicated mass spectral patterns. However, some of the main mass peaks could be assigned in the case of the Lysozyme adduct. In addition, crystallographic data were obtained for the (PtL) 4 /Lysozyme and (PtL) 4 /RNase A adducts pointing at His side chains as the primary binding sites for monometallic Pt fragments. Notably, a few selected features of the interactions observed in the (PtL) 4 /protein adducts were reproduced by reacting (PtL) 4 with a small molecule, i.e. N-methylimidazole. In conclusion, the present study confirms the prodrug nature of the tetraplatinum complex, clarifies one possible pathway for its activation through cluster disassembly and allows initial identification of adducts formed with a representative protein.


    Organizational Affiliation

    IAdChem (Institute for Advanced Research in Chemical Science) and Department of Inorganic Chemistry, Universidad Autónoma de Madrid, 28049, Spain. Electronic address: adoracion.gomez@uam.es.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ribonuclease pancreaticA, B124Bos taurusMutation(s): 0 
Gene Names: RNASE1RNS1
EC: 3.1.27.5 (PDB Primary Data), 4.6.1.18 (UniProt)
UniProt
Find proteins for P61823 (Bos taurus)
Explore P61823 
Go to UniProtKB:  P61823
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.951α = 90
b = 32.584β = 89.35
c = 72.502γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-29
    Type: Initial release
  • Version 1.1: 2019-03-13
    Changes: Data collection, Database references