Abstract
Activation of mitogen-activated protein kinases (MAPKs) under diverse biotic and abiotic factors and identification of an array of downstream MAPK target proteins are hot topics in plant signal transduction. Through interactions with a plethora of substrate proteins, MAPK cascades regulate many physiological processes in the course of plant growth, development, and response to environmental factors. Identification and quantification of potential MAPK substrates are essential, but have been technically challenging. With the recent advancement in phosphoproteomics, here we describe a method that couples metal dioxide for phosphopeptide enrichment with tandem mass tags (TMT) mass spectrometry (MS) for large-scale MAPK substrate identification and quantification. We have applied this method to a transient expression system carrying a wild type (WT) and a constitutive active (CA) version of a MAPK. This combination of genetically engineered MAPKs and phosphoproteomics provides a high-throughput, unbiased analysis of MAPK-triggered phosphorylation changes on the proteome scale. Therefore, it is a robust method for identifying potential MAPK substrates and should be applicable in the study of other kinase cascades in plants as well as in other organisms.
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Acknowledgments
This research was supported by grants from the National Science Foundation (MCB 0818051 and MCB 1412547) to S. Chen.
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Zhang, T., Schneider, J.D., Zhu, N., Chen, S. (2017). Identification of MAPK Substrates Using Quantitative Phosphoproteomics. In: Shan, L., He, P. (eds) Plant Pattern Recognition Receptors. Methods in Molecular Biology, vol 1578. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6859-6_10
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DOI: https://doi.org/10.1007/978-1-4939-6859-6_10
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