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Updated: Aug 24, 2026

Assaying Protein Kinase Activity with Radiolabeled ATP
Published on: May 26, 2017
ADP-specific sensors enable universal assay of protein kinase activity
Jayaram Srinivasan1, Sharon T Cload, Nobuko Hamaguchi
1Archemix Corporation, 1 Hampshire Street, Cambridge, MA 02139, USA.
Abstract:
Two molecular sensors that specifically recognize ADP in a background of over 100-fold molar excess of ATP are described. These sensors are nucleic-acid based and comprise a general method for monitoring protein kinase activity. The ADP-aptamer scintillation proximity assay is configured in a single-step, homogeneous format while the allosteric ribozyme (RiboReporter) sensor generates a fluorescent signal upon ADP-dependent ribozyme self-cleavage. Both systems perform well when configured for high-throughput screening and have been used to rediscover a known protein kinase inhibitor in a high-throughput screening format.
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