1. 1,4-Dihydropyridinebutyrolactone-derived ring-opened ester and amide analogs targeting BET bromodomains.
- Author
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Jiang, Jiewei, Zhao, Pei-Liang, Sigua, Logan, Chan, Alice, Schönbrunn, Ernst, Qi, Jun, and Georg, Gunda
- Subjects
AlphaScreen ,BET selectivity ,BROMOscan ,X-ray ,bromodomain and extra-terminal (BET) proteins ,Humans ,Male ,Amides ,Cell Cycle Proteins ,Esters ,Nuclear Proteins ,Structure-Activity Relationship ,Transcription Factors ,Lactones - Abstract
Based on a previously reported 1,4-dihydropyridinebutyrolactone virtual screening hit, nine lactone ring-opened ester and seven amide analogs were prepared. The analogs were designed to provide interactions with residues at the entrance of the ZA loop of the testis-specific bromodomain (ZA) channel to enhance the affinity and selectivity for the bromodomain and extra-terminal (BET) subfamily of bromodomains. Compound testing by AlphaScreen showed that neither the affinity nor the selectivity of the ester and lactam analogs was improved for BRD4-1 and the first bromodomain of the testis-specific bromodomain (BRDT-1). The esters retained affinity comparable to the parent compound, whereas the affinity for the amide analogs was reduced 10-fold. A representative benzyl ester analog was found to retain high selectivity for BET bromodomains as shown by a BROMOscan. X-ray analysis of the allyl ester analog in complex with BRD4-1 and BRDT-1 revealed that the ester side chain is located next to the ZA loop and solvent exposed.
- Published
- 2022