Background: Overactivity of fibroblast growth factor receptor 1 (FGFR1) is associated with various tumors, particularly breast cancer, prostate cancer, non-small-cell lung carcinoma, myeloproliferative diseases, which makes this protein kinase a promising therapeutic target for anticancer therapy. Objective: The main aim of this study is to identify novel FGFR1 inhibitors. Method: In order to find FGFR1 inhibitors, virtual screening experiments were performed using AutoDock software. Best-scored compounds were tested in vitro using P32 radioactive kinase assay. Results: Small-molecular inhibitors of protein kinase FGFR1 were identified among indazole derivatives. The most active compound [3-(3,4-dichloro-phenyl)-1H-indazol-5-yl]-(2,3-dihydro-1H-cyclopenta[b]quinolin-9-yl)-amine (1) inhibits FGFR1 with IC50 value of 100 nM. According to molecular docking results, this compound interacts simultaneously with adenine- and phosphate-binding regions of protein kinase FGFR1. The structure-activity relationships have been investigated and binding mode has been predicted. Conclusion: The compound 1 can be used for further structural optimization and biological research.

Aim.To search for new CK2 inhibitors by virtual screening. Methods. Virtual screening of a small organic compounds library was performed by molecular docking using the Autodock 4.2.6 package and pharmacophore screening with the "PharmDeveloper" program. The compound activity was determined by in vitro biochemical tests using γ-P32 ATP. Results. 298 compounds were selected for biochemical testing according to the results of virtual screening. In vitro experiments showed that 18 compounds have inhibitory activity against CK2 with IC 50 in the range of 1.4 to 20 μM. The active compounds belonged to 15 chemical classes. Conclusions. A number of effective CK2 inhibitors were found using molecular modeling and biochemical testing methods. LE values of these compounds were higher than 0.3 that makes these compounds excellent candidates for further drug development. K e y w o r d s:CK2 protein kinase, molecular docking, pharmacophore modeling, virtual screening, in vitro testing.is the most pleiotropic kinase among the protein kinase superfamily [2]. One of the explanations of such a pleiotropy may be that CK2 is present in all compartments of the cell from the nuclear to the plasma membrane, where it can interact with a large number of substrates [3, 4]. Taking into account all these facts, it is not surprisingly that CK2 is involved

Aim. To identify novel FGFR1 inhibitors using the virtual screening approach. Methods. Virtual screening of a small organic compounds library was performed by molecular docking using the Autodock 4.2.6 program package. The compounds activity was determined by in vitro biochemical tests using γ-32P ATP. Results. In vitro experiments demonstrated that 18 compounds belonging to three chemical classes had an inhibitory activity against FGFR1 with IC50 values in the range from 1.8 to 71 μM. Conclusions. Several FGFR1 inhibitors were found using molecular modeling and biochemical testing. These compounds are excellent candidates for further chemical optimization. K e y w o r d s: Fibroblast growth factor receptor 1, molecular docking, virtual screening, in vitro testing.

To synthesize the novel purine bioisosteres -indazole derivatives and evaluate inhibitory activity of these compounds towards CK2 in the in vitro system. Methods. Chemical synthesis, 1 H and 13 C NMR spectroscopy, LC-MS method, determination of residual enzyme activity using ATP consumption tests with a luciferase Kinase-Glo® luminescent kinase assay. Results. Known synthetic methods of indazole chemistry were originally applied to the synthesis of 3-aryl-indazole-7-carboxylic acids. Conditions of cross-coupling of 3-bromo-indazole derivatives with arylboronic acids were substantially improved. 3-aryl-indazole 5-and 7-carboxylic acids have shown IC 50 in a range 3.1-6.5 μM in luciferase luminescent kinase assay. Conclusions. The synthesis of 3-aryl-indazole-7-carboxylic acids has been developed. Novel inhibitors of the protein kinase CK2 among indazole derivatives have been identified among the 3-aryl-indazole 5-and 7-carboxylic acids. It has been shown the crucial impact of carboxyl group on the inhibitory activity of studied compounds. K e y w o r d s:Indazole, chemical synthesis, luciferase luminescent kinase assay, protein kinase inhibitor, protein kinase CK2.

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