Molecular Modeling Studies and Synthesis of Novel Methyl 2-(2-(4-Oxo-3-aryl-3,4-dihydroquinazolin-2-ylthio)acetamido)alkanoates with Potential Anti-cancer Activity as Inhibitors for Methionine Synthase
作者:Ismail Mahmoud Elfekki、Walid Fathalla Mohamed Hassan、Hosam Eldin Abd Elhamed Elshihawy、Ibrahim Ahmed Ibrahim Ali、Elsayed Hussein Mostafa Eltamany
DOI:10.1248/cpb.c14-00158
日期:——
Cobalamin-dependant cytosolic enzyme methionine synthase (MetS) catalyses the transfer of a methyl group from the methyltetrahydrofolate (MTHF) to homocysteine (Hcy) to produce methionine and tetrahydrofolate (THF). MetS is over-expressed in the cytosol of certain breast and prostate tumour cells. Methionine used as a source of one carbon atom for the building of the DNA of the tumour cells, structural protein and enzymes. In this study, we designed, synthesized and evaluated the cytotoxic activity of a series of substituted methyl 2-(2-(4-oxo-3-aryl-3,4-dihydroquinazolin-2-ylthio)acetamido)acetate and dipeptide that mimic the substructure of MTHF. These inhibitors were docked in to the MTHF binding domain in such the same way as MTHF in its binding domain. The free energies of the binding were calculated and compared to the IC50 values. This series has been developed by dicyclohexylcarbodiimide (DCC) and azide coupling methods of amino acid esters with carboxylic acid derivatives, respectively. Compound methyl 3-hydroxy-2-(2-(3-(4-methoxyphenyl)-4-oxo-3,4-dihydroquinazolin-2-ylthio)acetamido)propanoate exhibited the highest IC50 value 20 µg/mL against PC-3 cell line and scored the lowest free energy of the binding (−207.19 kJ/mol).
依赖于钴胺素的细胞膜酶甲硫氨酸合成酶(MetS)催化甲基四氢叶酸(MTHF)的甲基转移到同型半胱氨酸(Hcy)上,生成甲硫氨酸和四氢叶酸(THF)。MetS 在某些乳腺和前列腺肿瘤细胞的细胞质中过度表达。蛋氨酸是构建肿瘤细胞 DNA、结构蛋白和酶的一个碳原子来源。在这项研究中,我们设计、合成并评估了一系列取代 2-(2-(4-氧代-3-芳基-3,4-二氢喹唑啉-2-基硫基)乙酰氨基)乙酸甲酯和二肽的细胞毒性活性,它们模拟了 MTHF 的亚结构。这些抑制剂以与 MTHF 结合域相同的方式与 MTHF 结合域对接。计算出的结合自由能与 IC50 值进行了比较。这一系列化合物分别是通过二环己基碳二亚胺(DCC)和叠氮化物偶联氨基酸酯与羧酸衍生物的方法开发的。化合物 3-羟基-2-(2-(3-(4-甲氧基苯基)-4-氧代-3,4-二氢喹唑啉-2-基硫)乙酰氨基)丙酸甲酯对 PC-3 细胞系的 IC50 值最高,为 20 µg/mL,结合自由能最低(-207.19 kJ/mol)。