Abstract
Ataxia telangiectasia mutated (ATM) is a serine/threonine kinase critical to the cellular DNA-damage response, including DNA double-strand breaks (DSBs). ATM activation results in the initiation of a complex cascade of events facilitating DNA damage repair, cell cycle checkpoint control, and survival. Traditionally, protein kinases have been analyzed in vitro using biochemical methods (kinase assays using purified proteins or immunological assays) requiring a large number of cells and cell lysis. Genetically encoded biosensors based on optical molecular imaging such as fluorescence or bioluminescence have been developed to enable interrogation of kinase activities in live cells with a high signal to background. We have genetically engineered a hybrid protein whose bioluminescent activity is dependent on the ATM-mediated phosphorylation of a substrate. The engineered protein consists of the split luciferase-based protein complementation pair with a CHK2 (a substrate for ATM kinase activity) target sequence and a phospho-serine/threonine-binding domain, FHA2, derived from yeast Rad53. Phosphorylation of the serine residue within the target sequence by ATM would lead to its interaction with the phospho-serine-binding domain, thereby preventing complementation of the split luciferase pair and loss of reporter activity. Bioluminescence imaging of reporter expressing cells in cultured plates or as mouse xenografts provides a quantitative surrogate for ATM kinase activity and therefore the cellular DNA damage response in a noninvasive, dynamic fashion.
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Acknowledgments
We would like to acknowledge members of the Center for Molecular Imaging at the University of Michigan for their valuable input and support for the studies. This work was supported by the National Institutes of Health grant R01CA193690 (AR), P01CA087634 (BDR, AR and SN) as well as a P30CA046592 award to the University of Michigan Cancer Center.
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Nyati, S., Young, G., Ross, B.D., Rehemtulla, A. (2017). Quantitative and Dynamic Imaging of ATM Kinase Activity. In: Stein, V. (eds) Synthetic Protein Switches. Methods in Molecular Biology, vol 1596. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6940-1_9
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DOI: https://doi.org/10.1007/978-1-4939-6940-1_9
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