4XG9
Crystal structure of an inhibitor-bound Syk
Summary for 4XG9
| Entry DOI | 10.2210/pdb4xg9/pdb |
| Related | 4XG2 4XG3 4XG4 4XG5 4XG6 4XG7 4XG8 |
| Descriptor | Tyrosine-protein kinase SYK, 1-[(1-{2-[(3-chloro-1,2-dimethyl-1H-indol-5-yl)amino]pyrimidin-4-yl}-3-methyl-1H-pyrazol-4-yl)methyl]azetidin-3-ol (3 entities in total) |
| Functional Keywords | syk kinase, inhibitor, spleen tyrosine kinase, transferase-transferase inhibitor complex, transferase/transferase inhibitor |
| Biological source | Homo sapiens (Human) |
| Total number of polymer chains | 2 |
| Total formula weight | 68677.78 |
| Authors | |
| Primary citation | Lee, S.J.,Choi, J.S.,Han, B.G.,Kim, H.S.,Song, H.J.,Lee, J.,Nam, S.,Goh, S.H.,Kim, J.H.,Koh, J.S.,Lee, B.I. Crystal structures of spleen tyrosine kinase in complex with novel inhibitors: structural insights for design of anticancer drugs Febs J., 283:3613-3625, 2016 Cited by PubMed Abstract: Spleen tyrosine kinase (SYK) is a cytosolic nonreceptor protein tyrosine kinase that mediates key signal transduction pathways following the activation of immune cell receptors. SYK regulates cellular events induced by the B-cell receptor and Fc receptors with high intrinsic activity. Furthermore, SYK has been regarded as an attractive target for the treatment of autoimmune diseases and cancers. Here, we report the crystal structures of SYK in complex with seven newly developed inhibitors (G206, G207, O178, O194, O259, O272, and O282) to provide structural insights into which substituents of the inhibitors and binding regions of SYK are essential for lead compound optimization. Our kinase inhibitors exhibited high inhibitory activities against SYK, with half-maximal inhibitory concentrations (IC ) of approximately 0.7-33 nm, but they showed dissimilar inhibitory activities against KDR, RET, JAK2, JAK3, and FLT3. Among the seven SYK inhibitors, O272 and O282 exhibited highly specific inhibitions against SYK, whereas O194 exhibited strong inhibition of both SYK and FLT3. Three inhibitors (G206, G207, and O178) more efficiently inhibited FLT3 while still substantially inhibiting SYK activity. The binding mode analysis suggested that a highly selective SYK inhibitor can be developed by optimizing the functional groups that facilitate direct interactions with Asn499. PubMed: 27504936DOI: 10.1111/febs.13831 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.91 Å) |
Structure validation
Download full validation report
