8r4o
From Proteopedia
Salt inducible kinase 3 in complex with inhibitor
Structural highlights
DiseaseSIK3_HUMAN The disease is caused by variants affecting the gene represented in this entry. FunctionSIK3_HUMAN Positive regulator of mTOR signaling that functions by triggering the degradation of DEPTOR, an mTOR inhibitor. Involved in the dynamic regulation of mTOR signaling in chondrocyte differentiation during skeletogenesis (PubMed:30232230). Negatively regulates cAMP signaling pathway possibly by acting on CRTC2/TORC2 and CRTC3/TORC3 (Probable). Prevents HDAC4 translocation to the nucleus (By similarity).[UniProtKB:Q6P4S6][1] [2] Publication Abstract from PubMedThe salt-inducible kinases (SIKs) 1 to 3, belonging to the AMPK-related kinase family, serve as master regulators orchestrating a diverse set of physiological processes such as metabolism, bone formation, immune response, oncogenesis, and cardiac rhythm. Owing to its key regulatory role, the SIK kinases have emerged as compelling targets for pharmacological intervention across a diverse set of indications. Therefore, there is interest in developing SIK inhibitors with defined selectivity profiles both to further dissect the downstream biology and for treating disease. However, despite a large pharmaceutical interest in the SIKs, experimental structures of SIK kinases are scarce. This is likely due to the challenges associated with the generation of proteins suitable for structural studies. By adopting a rational approach to construct design and protein purification, we successfully crystallized and subsequently solved the structure of SIK3 in complex with HG-9-91-01, a potent SIK inhibitor. To enable further SIK3-inhibitor complex structures we identified an antibody fragment that facilitated crystallization and enabled a robust protocol suitable for structure-based drug design. The structures reveal SIK3 in an active conformation, where the ubiquitin-associated domain is shown to provide further stabilization to this active conformation. We present four pharmacologically relevant and distinct SIK3-inhibitor complexes. These detail the key interaction for each ligand and reveal how different regions of the ATP site are engaged by the different inhibitors to achieve high affinity. Notably, the structure of SIK3 in complex with a SIK3 specific inhibitor offers insights into isoform selectivity. The structures of salt-inducible kinase 3 in complex with inhibitors reveal determinants for binding and selectivity.,Oster L, Castaldo M, de Vries E, Edfeldt F, Pemberton N, Gordon E, Cederblad L, Kack H J Biol Chem. 2024 May;300(5):107201. doi: 10.1016/j.jbc.2024.107201. Epub 2024 , Mar 18. PMID:38508313[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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