Computational POM and DFT Evaluation of Experimental in-vitro Cancer Inhibition of Staurosporine-Ruthenium(II) Complexes: The Power Force of Organometallics in Drug Design

A computational Petra/Osiris/Molinspiration/DFT(POM/DFT) based model has been developed for the identification of physic-chemical parameters governing the bioactivity of  Ruthenium-Staurosporine complexes 2-4 containing an antitumoral-Kinase (TK) pharmacophore sites. The four compounds 1-4 analyzed here were previously screened for their antitumor activity , compounds 2 and 4 are neutral, whereas analogue compound 3 is a monocation with Ruthenium(II) centre. The highest anti- antitumor activity was obtained for compounds 3 and 4 , which exhibited low IC 50 values (0.45 and 8 nM, respectively), superior to Staurosporine derivative (pyridocarbazole ligand 1, 150 x 10 3 nM). The IC 50 of 3 (0.45 nM), represents 20,000 fold increased activity as compared to Staurosporine derivative 1. The increase of bioactivity could be attributed to the existence of pi-charge transfer from Metal-Staurosporine to its (CO d - --NH d + ) antitumor phramacophore site.