Identifying the cellular targets of bioactive small molecules with activity-based probes

Area of Science:

• Chemical Biology
• Drug Discovery
• Molecular Pharmacology

Background:

• Phenotypic assays are crucial for identifying bioactive small molecules.
• Target identification for these molecules is a key challenge in drug discovery.
• Understanding drug-target interactions in a native cellular environment is essential.

Purpose of the Study:

• To provide an overview of designing activity-based small molecular probes.
• To review the application of these probes in target identification.
• To highlight logistic considerations and recent advancements in probe design.

Main Methods:

• Derivatization of bioactive small molecules into activity-based probes.
• Direct determination of small molecule-protein interactions in native cellular environments.
• Case studies illustrating probe applications for target identification.

Main Results:

• Activity-based probes allow direct visualization of drug-target engagement.
• Probes maintain protein structure and post-translational modifications in situ.
• Enhanced intracellular access of small molecular probes improves target engagement.

Conclusions:

• Activity-based probes offer a precise method for understanding drug mechanisms of action.
• This chemical platform elucidates the specificity of bioactive small molecules.
• The strategy is vital for advancing drug discovery and target identification.