Abstract
The reaction mechanism of the binding of the completely hydrolyzed trans-[Pd(dmnp)2Cl2] (dmnp = 2,6-dimethyl-4-nitropyridine) complexes to DNA and peptides was investigated computationally using model molecules and density functional theory calculations at the B3LYP level. To test the solvent effect, single-point energy calculations for the structures optimized in all reactions were conducted by employing the polarizable continuum model (IEF-PCM). The pentammineruthenium fragment had been intensively studied and also constituted a good model for antitumor trans-[Pd(dmnp)2Cl2], while the considered bases/ligands had been chosen as models for the main binding sites of DNA, nucleobases, and phosphate backbone and proteins, nitrogen-containing histidyl, and sulfur-containing residue such as methionine or cysteine. The activation free energies had been calculated for all the considered metal binding sites both in the gas phase and in solution and allowed building a binding affinity order for the considered nucleic acid or protein binding sites. Additionally, to better understand the interactions between the compounds and binding sites, the natural orbital population analysis (NPA) was adopted for every stationary point to employ the mutative trend of the net charge on the three important atoms which directly related to the reactions.
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Acknowledgments
This work was carried out with financial support from the National Natural Science Foundation of China (Grant No. 20971056).
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11224_2011_9833_MOESM1_ESM.doc
Supplementary Data Available: Figures of trans-[Pd(dmnp)2Cl2] in all studied reactions, coordinates for optimized geometries of all calculations reported herein, and calculated vibrational frequencies of all systems. This material is available free of charge.(DOC 311 kb)
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Jiang, B., Zhou, L. Theoretical study of anticancer drug trans-[Pd(dmnp)2Cl2] binding to DNA purine bases, phosphate group and amino acid residues. Struct Chem 22, 1353–1364 (2011). https://doi.org/10.1007/s11224-011-9833-9
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DOI: https://doi.org/10.1007/s11224-011-9833-9