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

## TL;DR

This paper reviews how NMR spectroscopy can be used to discover small molecules that bind to RNA, which was once considered undruggable.

## Contribution

The paper provides a comprehensive review of NMR-based methods for RNA-targeted drug discovery and highlights recent advances and challenges.

## Key findings

- NMR spectroscopy is effective for detecting weak RNA-ligand interactions and guiding drug optimization.
- RNA has become a viable target for small-molecule drugs, with recent studies identifying potent RNA binders.
- The paper outlines practical pipelines and case studies for RNA-targeted NMR screening.

## Abstract

Fragment-based drug discovery (FBDD) has emerged as a primary approach for identifying low molecular weight leads that can be systematically optimized into high-affinity compounds. Because fragments bind inherently weakly, their detection relies on highly sensitive biophysical tools. Nuclear magnetic resonance (NMR) spectroscopy is uniquely qualified for fragment screening due to its capability in detecting weak interactions across a broad affinity range while providing site-specific binding information that supports structure-guided optimization. While FBDD is a mature field for protein targets, structured and disease-relevant RNAs have transitioned from ‘undruggable’ molecules to viable therapeutic targets for small-molecule intervention. Recent studies demonstrate that NMR-based screening can identify authentic RNA binders and guide their evolution into potent, selective ligands. This review summarizes the practical and methodological pipelines for RNA-targeted small molecule NMR screening, covering RNA construct design, sample preparation, and library pooling strategies. We evaluate both ligand- and RNA-observed NMR assays for primary hit screening and validation, integration of NMR restraints with structural modeling, and representative case studies. Finally, we discuss current bottlenecks in the field and highlight emerging strategies to accelerate the discovery of RNA-directed therapeutics.