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A comparative study of ATP analogs for phosphorylation-dependent kinase-substrate crosslinking

机译：A comparative study of ATP analogs for phosphorylation-dependent kinase-substrate crosslinking

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Kinase-catalyzed protein phosphorylation is an important post-translational modification that regulates a variety of cellular functions. Identification of the many substrates of a specific kinase is critical to fully characterize cell biology. Unfortunately, kinase-substrate interactions are often transient, which makes their identification challenging. Here, the transient kinase-substrate complex was stabilized by covalent crosslinking using γ-phosphate modified ATP analogs. Building upon prior use of an ATP-aryl azide photocrosslinking analog, we report here the creation of an ATP-benzophenone photocrosslinking analog. ATP-benzophenone displayed a higher conversion percentage but more diffuse crosslinking compared to the ATP-aryl azide analog. A docking study was also performed to rationalize the conversion and crosslinking data. In total, the photocrosslinking ATP analogs produced stable kinase-substrate complexes that are suitable for future applications characterizing cell signaling pathways.

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