Abstract
Phosphorylation/dephosphorylation is a key posttranslational mechanism for signal transduction and amplification. Several techniques exist for assessing protein phosphorylation status, but each has its own drawbacks. The fast, straightforward, and low-tech approach described here uses transient overexpression of peptide-tagged proteins in Arabidopsis leaf mesophyll protoplasts and immunoblotting with Phos-tag™ SDS-PAGE and commercial anti-tag antibodies. We illustrate this with two relevant examples related to the SnRK1 protein kinase, which mediates metabolic stress signaling: Arabidopsis thaliana SnRK1 activation by T-loop (auto-)phosphorylation and SnRK1 phosphorylation of the Arabidopsis RAV1 transcription factor, which is involved in seed germination and early seedling development.
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Broucke, E., Rolland, F., Crepin, N. (2023). Fast Identification of In Vivo Protein Phosphorylation Events Using Transient Expression in Leaf Mesophyll Protoplasts and Phos-tagTM SDS-PAGE. In: Couée, I. (eds) Plant Abiotic Stress Signaling. Methods in Molecular Biology, vol 2642. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3044-0_12
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DOI: https://doi.org/10.1007/978-1-0716-3044-0_12
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