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Updated: Feb 12, 2026

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Structure-based design of targeted covalent inhibitors
Richard Lonsdale1, Richard A Ward
1Chemistry, Oncology, IMED Biotech Unit, AstraZeneca, Cambridge, CB4 0WG, UK. richard.a.ward@astrazeneca.com.
Covalent inhibition is revolutionizing drug discovery, offering new hope for difficult targets. Targeted covalent inhibitors (TCIs) enhance drug potency and selectivity, overcoming previous limitations in small molecule inhibitor development.
Area of Science:
- Medicinal Chemistry
- Drug Discovery
- Pharmacology
Background:
- Covalent inhibition, once serendipitous and viewed with caution due to toxicity, is now a key area in drug discovery.
- Historical challenges with covalent inhibitors are being overcome by modern approaches.
- The field has shifted towards leveraging covalent inhibition for challenging drug targets.
Purpose of the Study:
- To introduce the fundamental concepts of covalent inhibition in drug discovery.
- To discuss the advantages and disadvantages associated with covalent inhibitor development.
- To provide a comprehensive overview of the current landscape and future directions in covalent drug discovery.
Main Methods:
- Review of historical and current covalent inhibitor strategies.
- Discussion of the design principles for targeted covalent inhibitors (TCIs).
- Overview of computational tools and methodologies for covalent drug discovery.
Main Results:
- Covalent inhibition offers a viable strategy for targets refractory to non-covalent approaches.
- TCIs can significantly improve drug potency and selectivity through targeted covalent binding.
- The field is advancing with new strategies and computational aids for successful development.
Conclusions:
- Covalent inhibition represents a powerful and increasingly important modality in modern drug discovery.
- Targeted covalent inhibitors provide a promising avenue for developing novel therapeutics.
- Further exploration of strategies and computational tools will accelerate covalent drug discovery efforts.
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