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  What is CovalentInDB


CovalentInDB (Covalent Inhibitor Database) is the largest web-accessible resource for covalent inhibitors and related targets.
CovalentInDB provides not only the basic information of covalent inhibitors, targets, and bioactivity, but also the reactive warheads of inhibitors, covalent reaction mechanism, attacked nucleophilic residues and covalent-mechanism experimental verification methods. A molecular visualization function is also embedded to display protein-ligand interaction.



2024/06/20: We are excited to introduce CovalentInDB 2.0 with its enhanced features. Please explore the new capabilities. We are continually reviewing and updating the database, so the data will be periodically updated in the near future.

  Feature 1: Covalent-binding Complexes


A new form of data, the cocrystal structures of 3445 covalent ligand-protein complexes, was added to our database. We made a systematic analysis of protein-ligand binding mode for each complex and a pharmacophore model was also proposed based on the protein-ligand interactions, which was dedicated to provide useful information for the structure-based rational design of targeted covalent inhibitors.

Search for complexes:

  Feature 2: Proteome-wide Profiled Covalent Binding Sites


A lack of the knowledge of covalent binding sites has limited the development of covalent ligands. In order to expand the research of covalent ligands to the proteome-level, we profiled the entire structures in RCSB Protein Data Bank (PDB) with an well-validated AI model (DeepCoSI) to evaluate the ligandability of each cysteine for covalent ligand design.
Search the profiled database:

  Feature 3: Natural Compounds with Covalent Binding Potential


Natural compounds have long been recognized for their therapeutic potential and are a cornerstone in the search for new drugs. By analyzing the covalent binding capabilities of these compounds, we aim to uncover new opportunities for drug discovery and development. Our rigorous analysis identifies 105,901 natural compounds with promising covalent binding warheads, adding a valuable layer of information for researchers and developers.

Explore the data! to leverage the power of natural compounds in your research and drug discovery efforts.

  Feature 4: Covalent Virtual Screening Library


We are the first to analyze commercially-available compounds, identifying 2,030,192 in-stock compounds with covalent binding warheads. For each compound, we predicted ADMET (Absorption, Distribution, Metabolism, Excretion, and Toxicity) properties using ADMETLab 2.0. This curated Covalent Virtual Screening Library is a significant tool for the covalent drug discovery community, providing detailed data to support the development of novel therapeutics.

Explore the library! to leverage extensive data for innovative covalent inhibitor research.
Cite CovalentInDB: Du, H., Gao, J., Weng, G., Ding, J., Chai, X., Pang, J., Kang, Y., Li, D., Cao, D., & Hou, T. (2021). CovalentInDB: a comprehensive database facilitating the discovery of covalent inhibitors. Nucleic acids research, 49(D1), D1122–D1129. https://doi.org/10.1093/nar/gkaa876