Interaction of cisplatin in activated diaqua-form with His-Met dipeptide is explored using DFT approach with PCM model. First the conformation space of the dipeptide is explored to find the most stable structure (labeled 0683). Several functionals with double-zeta basis set are used for optimization and obtained order of conformers is confirmed by the CCSD(T) single-point calculations. Supermolecular model is used to determine reaction coordinate for the replacement of aqua ligands consequently by N-site of histidine and S-site of methionine and reversely. Despite the monoadduct of Pt-S(Met) is thermodynamically less stable this reaction passes substantially faster (by several orders of magnitude) than coordination of cisplatin to histidine. The consequent chelate formation occurs relatively fast with energy release up to 12 kcal mol-1.

• Keywords
• Anticancer drug, Computational chemistry, Density functional theory, Heavy metal, Thermodynamics,
• MeSH
• Chelating Agents chemistry   MeSH
• Cisplatin chemistry   MeSH
• Dipeptides chemistry   MeSH
• Histidine chemistry   MeSH
• Kinetics MeSH
• Methionine chemistry   MeSH
• Antineoplastic Agents chemistry   MeSH
• Density Functional Theory * MeSH
• Thermodynamics MeSH
• Publication type
• Journal Article MeSH
• Research Support, Non-U.S. Gov't MeSH
• Names of Substances
• Chelating Agents MeSH
• Cisplatin MeSH
• Dipeptides MeSH
• Histidine MeSH
• Methionine MeSH
• Antineoplastic Agents MeSH