NMR-Based Fragment Screening for RNA-Targeted Drug Discovery.

Area of Science:

• Biochemistry
• Chemical Biology
• Structural Biology

Background:

• Fragment-based drug discovery (FBDD) identifies low molecular weight compounds for optimization into high-affinity drugs.
• Nuclear magnetic resonance (NMR) spectroscopy is a sensitive biophysical tool crucial for detecting weak molecular interactions.
• Structured RNAs are emerging as viable therapeutic targets for small-molecule intervention.

Purpose of the Study:

• To review practical and methodological pipelines for NMR-based screening of small molecules targeting RNA.
• To evaluate NMR assays for hit screening, validation, and structure-guided optimization of RNA binders.
• To discuss current challenges and future strategies in RNA-targeted drug discovery.

Main Methods:

• NMR spectroscopy for fragment screening and binding detection.
• RNA construct design, sample preparation, and library pooling strategies.
• Ligand-observed and RNA-observed NMR assays for screening and validation.
• Integration of NMR data with structural modeling.

Main Results:

• NMR is uniquely qualified for detecting weak fragment-RNA interactions and providing site-specific binding information.
• NMR-based screening successfully identifies authentic RNA binders and guides their optimization.
• Methodological pipelines for RNA-targeted small molecule NMR screening are summarized.

Conclusions:

• NMR-based FBDD is a powerful approach for discovering and optimizing small molecules against RNA targets.
• Structured RNAs are increasingly druggable, with NMR playing a key role in therapeutic development.
• Emerging strategies aim to accelerate the discovery of RNA-directed therapeutics using NMR.