Abstract
Protein kinase profiling can provide a basis for understanding the molecular origins of diseases and, potentially, for developing tools for therapeutic intervention. It is therefore very important to develop advanced experimental procedures for convenient and accurate determination of the phosphorylation status of certain substrate proteins in the life sciences. Here, we introduce a method for protein kinase profiling by using a novel type of phosphate-affinity sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The phosphate-affinity site is a polyacrylamide-bound dinuclear metal complex of a phosphate-binding tag molecule known as Phos-tag. The Phos-tag SDS-PAGE method permits detection of changes in the mobility of phosphorylated proteins in comparison with their nonphosphorylated counterparts and thereby allows quantitative analysis of protein kinase reactions without any special apparatus, radioactive isotopes, or chemical labels. If a kinase reaction occurs at one residue of a substrate protein, the monophosphorylated and nonphosphorylated forms can be simultaneously detected as two migration bands on a Phos-tag SDS-PAGE gel. In the case of hyperphosphorylation, the phosphorylated products appear as multiple migration bands, depending on the phosphorylation status in terms of the numbers and the positions of attached phosphate groups. This article discusses applications of label-free kinase activity profiling by the Phos-tag SDS-PAGE method in the analysis of phosphorylated substrates derived from various kinase reactions. The resolving power of the affinity electrophoresis provides detailed information that leads to an overview of the kinase-dependent dynamics of various substrate proteins.
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Acknowledgments
We wish to thank the Research Center for Molecular Medicine and the Analysis Center of Life Science, Hiroshima University, Japan, for the use of their facilities. This work was supported in part by Grants-in-Aid for Scientific Research (B, 22390006; C, 22590037; C, 24590050) from the Japan Society for the Promotion of Science (JSPS), by a Grant-in Aid for Scientific Research on Innovative Areas (23117522) from the Ministry of Education Culture, Sports, Science, and Technology (MEXT), and by a exploratory research grant (AS232Z01251F) for Adaptable and Seamless Technology Transfer Program through Target-driven R&D (A-STEP) from the Japan Science and Technology Agency (JST). Financial support was also provided by The Takeda Science Foundation and The Ube Foundation.
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Kinoshita, E., Kinoshita-Kikuta, E., Koike, T. (2012). Phos-tag Affinity Electrophoresis for Protein Kinase Profiling. In: Mukai, H. (eds) Protein Kinase Technologies. Neuromethods, vol 68. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-61779-824-5_2
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DOI: https://doi.org/10.1007/978-1-61779-824-5_2
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