ジャーナル: Proc Natl Acad Sci U S A / 年: 2025 タイトル: Molecular insights into de novo small-molecule recognition by an intron RNA structure. 著者: Tianshuo Liu / Ling Xu / Kevin Chung / Luke J Sisto / Jimin Hwang / Chengxin Zhang / Michael C Van Zandt / Anna Marie Pyle / 要旨: Despite the promise of vastly expanding the druggable genome, rational design of RNA-targeting ligands remains challenging as it requires the rapid identification of hits and visualization of the ...Despite the promise of vastly expanding the druggable genome, rational design of RNA-targeting ligands remains challenging as it requires the rapid identification of hits and visualization of the resulting cocomplexes for guiding optimization. Here, we leveraged high-throughput screening, medicinal chemistry, and structural biology to identify a de novo splicing inhibitor against a large and highly folded fungal group I intron. High-resolution cryoEM structures of the intron in different liganded states not only reveal molecular interactions that rationalize experimental structure-activity relationship but also shed light on a unique strategy whereby RNA-associated metal ions and RNA conformation exhibit exceptional plasticity in response to small-molecule binding. This study reveals general principles that govern RNA-ligand recognition, the interplay between chemical bonding specificity, and dynamic responses within an RNA target.
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