8ai0
Small molecular stabilizer for ERalpha and 14-3-3sigma (1080268)
Structural highlights
Function1433S_HUMAN Adapter protein implicated in the regulation of a large spectrum of both general and specialized signaling pathways. Binds to a large number of partners, usually by recognition of a phosphoserine or phosphothreonine motif. Binding generally results in the modulation of the activity of the binding partner. When bound to KRT17, regulates protein synthesis and epithelial cell growth by stimulating Akt/mTOR pathway (By similarity). p53-regulated inhibitor of G2/M progression. Publication Abstract from PubMedThe stabilization of protein-protein interactions (PPIs) has emerged as a promising strategy in chemical biology and drug discovery. The identification of suitable starting points for stabilizing native PPIs and their subsequent elaboration into selective and potent molecular glues lacks structure-guided optimization strategies. We have previously identified a disulfide fragment that stabilized the hub protein 14-3-3sigma bound to several of its clients, including ERalpha and C-RAF. Here, we show the structure-based optimization of the nonselective fragment toward selective and highly potent small-molecule stabilizers of the 14-3-3sigma/ERalpha complex. The more elaborated molecular glues, for example, show no stabilization of 14-3-3sigma/C-RAF up to 150 muM compound. Orthogonal biophysical assays, including mass spectrometry and fluorescence anisotropy, were used to establish structure-activity relationships. The binding modes of 37 compounds were elucidated with X-ray crystallography, which further assisted the concomitant structure-guided optimization. By targeting specific amino acids in the 14-3-3sigma/ERalpha interface and locking the conformation with a spirocycle, the optimized covalent stabilizer 181 achieved potency, cooperativity, and selectivity similar to the natural product Fusicoccin-A. This case study showcases the value of addressing the structure, kinetics, and cooperativity for molecular glue development. Structure-Based Optimization of Covalent, Small-Molecule Stabilizers of the 14-3-3sigma/ERalpha Protein-Protein Interaction from Nonselective Fragments.,Konstantinidou M, Visser EJ, Vandenboorn E, Chen S, Jaishankar P, Overmans M, Dutta S, Neitz RJ, Renslo AR, Ottmann C, Brunsveld L, Arkin MR J Am Chem Soc. 2023 Sep 20;145(37):20328-20343. doi: 10.1021/jacs.3c05161. Epub , 2023 Sep 7. PMID:37676236[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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