QSAR and molecular docking studies on oxindole derivatives as VEGFR-2 tyrosine kinase inhibitors

The three-dimensional quantitative structure- activity relationships ( 3D- QSAR) were established for 30 oxindole derivatives as vascular endothelial growth factor receptor- 2 ( VEGFR- 2) tyrosine kinase inhibitors by using comparative molecular field analysis ( CoMFA) and comparative similarity indices analysis comparative molecular similarity indices analysis ( CoMSIA) techniques. With the CoMFA model, the cross- validated value ( q 2) was 0.777, the non- cross- validated value ( R 2) was 0.987, and the external cross- validated value ( Q(ext)(2)) was 0.72. And with the CoMSIA model, the corresponding q 2, R 2 and Q2 ext values were 0.710, 0.988 and 0.78, respectively. Docking studies were employed to bind the inhibitors into the active site to determine the probable binding conformation. The binding mode obtained by molecular docking was in good agreement with the 3D- QSAR results. Based on the QSAR models and the docking binding mode, a set of new VEGFR- 2 tyrosine kinase inhibitors were designed, which showed excellent predicting inhibiting potencies. The result revealed that both QSAR models have good predictive capability to guide the design and structural modification of homologic compounds. It is also helpful for further research and development of new VEGFR- 2 tyrosine kinase inhibitors.