Synthesis of a novel biotin-tagged photoaffinity probe for VEGF receptor tyrosine kinases

Probes for Photoaffinity Labelling of Kinases

Protein kinases, one of the largest enzyme superfamilies, regulate many physiological and pathological processes. They are drug targets for multiple human diseases, including various cancer types. Probes for the photoaffinity labelling of kinases are important research tools for the study of members of this enzyme superfamily. In this review, we discuss the design principles of these probes, which are mainly derived from inhibitors targeting the ATP pocket. Overall, insights from crystal structures guide the placement of photoreactive groups and detection tags. This has resulted in a wide variety of probes, of which we provide a comprehensive overview. We also discuss several areas of application of these probes, including the identification of targets and off-targets of kinase inhibitors, mapping of their binding sites, the development of inhibitor screening assays, the imaging of kinases, and identification of protein binding partners.

Introduction to Chemical Proteomics for Drug Discovery and Development

A fundamental goal of chemical proteomics is to identify target proteins for bioactive small molecules and then apply them to drug discovery and development as valid and drugable targets. Here, we introduce integrated technologies for the rapid identification of target proteins, methodologies for validating them as drugable targets, and applications of chemical proteomics in drug discovery and development.

Synthesis of novel chemical probes for the study of tanshinone binding proteins

Novel diazirine or biotin-labeled tanshinone probes were synthesized and evaluated for TRAP inhibitory activity against RANKL-induced osteoclastogenesis in RAW264.7 cells. We found that diazirine-labeled derivatives (18 and 20) are potent inhibitors of RANKL-induced osteoclastogenesis. IC50 values were 18.02 and 15.00 microM, respectively. These probes will be useful reagents for investigating tanshinone-proteins interactions.