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Updated: Feb 27, 2026

Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
Published on: February 28, 2025
Covalent inhibitors design and discovery.
Stephane De Cesco1, Jerry Kurian1, Caroline Dufresne1
1Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montréal, Québec H3A 0B8, Canada.
Covalent drugs, which form permanent bonds with targets, are increasingly important. This review details their design, development, and safe application, focusing on enzyme inhibitors and computational strategies.
Area of Science:
- Medicinal Chemistry
- Pharmacology
- Drug Discovery
Background:
- Covalent drugs represent a distinct and significant class of therapeutics.
- Despite their prevalence, few covalent drugs are intentionally designed for specific targets.
- Understanding covalent interactions is crucial for developing targeted therapies.
Purpose of the Study:
- To review the prevalence and mechanisms of covalent drugs.
- To outline strategies for the discovery and development of safe and effective covalent enzyme inhibitors.
- To discuss computational methods in covalent drug design.
Main Methods:
- Literature review of covalent drug prevalence and mechanisms.
- Discussion of drug discovery stages for covalent inhibitors, including target selection and lead optimization.
- Analysis of strategies for tuning reactivity and computational approaches.
Main Results:
- Covalent drugs have a notable presence in the market, with diverse mechanisms of action.
- Systematic approaches are required for the rational design of covalent enzyme inhibitors.
- Computational tools offer potential but have limitations in predicting covalent interactions.
Conclusions:
- Covalent drugs require careful design and assessment due to their unique reactivity.
- Best practices are needed for developing safe and efficient covalent inhibitors.
- Further advancements in computational methods are essential for optimizing covalent drug discovery.
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