The hydrolysis process of the anticancer complex [ImH][trans-RuCl4(Im)2]: a theoretical study.
A hydrolysis process of the anticancer drug [ImH][trans-RuCl4(Im)2] (ICR, Im=imidazole) has been investigated using density functional theory (DFT), and the aqueous solution effect has been considered and calculated by the conductor-like polarizable calculation model (CPCM). The stationary points on the potential energy surfaces for the first and second hydrolysis steps (including two different paths) were fully optimized and characterized. The results show that the computed values of free energy barriers DeltaG degrees (aq) and rate constants (k) in aqueous solution, in particular for the first hydrolysis step, are in excellent agreement with the experimental results. The analysis of electronic characteristics of species in the hydrolysis process suggests that the nucleophilic attack abilities (A) of hydrolysis products by biomolecular targets is in the sequence of A()<A()<A() (, and express the hydrolysis products of the first hydrolysis step, and of the second hydrolysis step through path 1 and path 2, respectively). On the basis of our present limited work, the following can reasonably be suggested: path 1 in the second hydrolysis step has thermodynamic preference over path 2, and thus the cis-diaqua species may dominate. The theoretical results provide the structural properties as well as the detailed energy profiles for the hydrolysis process of ICR, so such results may contribute to understanding the reaction mechanism of this drug with the biomolecular target.
School of Chemistry and Chemical Engineering, The Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, and Sun Yat-Sen University, Guangzhou 510275, China.
Jincan
J
Chen
Lanmei
L
Chen
Siyan
S
Liao
Kangcheng
K
Zheng
Liangnian
L
Ji
D000970:Antineoplastic Agents / Q000737:chemistry*; D003198:Computer Simulation; D006868:Hydrolysis; D007700:Kinetics; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D013816:Thermodynamics
D000970:Antineoplastic Agents; D009942:Organometallic Compounds; C416932:imidazolium imidazoletetrachlororuthenate(III)