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• W2024709533 abstract "C/Si switch: Twofold sila-substitution (C/Si exchange) in the RXR-selective retinoids 4 a (SR11237) and 5 a leads to 4 b (disila-SR11237) and 5 b, respectively. Chemistry and biology of the C/Si pairs are reported. SR11237 (BMS649, 4 a) is a pan-RXR-selective retinoid agonist. Its silicon analogue, disila-SR11237 (4 b; twofold C/Si exchange), was prepared in a multistep synthesis by starting from 1,2-bis(ethynyldimethylsilyl)ethane. In addition, the related C/Si analogues 5 a and 5 b, with an indane (disila-indane) instead of a tetraline (disila-tetraline) skeleton, were synthesized. The C/Si pairs 4 a/4 b and 5 a/5 b were studied for their interaction with retinoid receptors and were demonstrated to be highly potent RXR-selective (“rexinoid”) agonists. Interestingly, twofold C/Si exchange in the indane moiety of 5 a resulted in a 10-fold increase in biological activity of the corresponding silicon-containing rexinoid 5 b, possibly resulting from an increased receptor affinity or a divergent allosteric effect on co-regulator-binding surfaces. The crystal structures of the ternary complexes formed by 5 a and 5 b, respectively, with the ligand-binding domain of hRXRα and a peptide of the co-activator TIF2/GRIP1 revealed additional interactions of the disila analogue 5 b with the H7 and H11 residues, supporting the first option of increased binding affinity. This is the first demonstration of an increase in binding affinity of a ligand to a nuclear receptor by C/Si replacement, thereby adding this C/Si switch strategy to the repertoire of nuclear receptor ligand design." @default.
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• W2024709533 date "2009-07-06" @default.
• W2024709533 modified "2023-10-18" @default.
• W2024709533 title "Silicon Analogues of the RXR-Selective Retinoid Agonist SR11237 (BMS649): Chemistry and Biology" @default.
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• W2024709533 doi "https://doi.org/10.1002/cmdc.200900090" @default.
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