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- W114753366 abstract "Protein phosphatases act to reverse phosphorylation-related modifications induced by protein kinases. Type 2C protein phosphatases (PP2C) are monomeric Ser/Thr phosphatases that require a metal for their activity and are abundant in prokaryotes and eukaryotes. In plants, such as Medicago and Arabidopsis PP2Cs control several essential processes, including ABA signaling, development, and wound-induced mitogen-activated protein kinase (MAPK) pathways. In vitro assays with recombinant proteins and yeast two-hybrid systems usually provide initial information about putative PP2C substrates; however, these observations have to be verified in vivo. Therefore, a method for transient expression in isolated Arabidopsis suspension cell protoplasts was developed to assay PP2C action in living cells. This system has proven to be very useful in producing active enzymes and their substrates and in performing enzymatic reactions in vivo. Transient gene expression in isolated cells enabled assembly of functional protein kinase cascades and the creation of phosphorylated targets for PP2Cs. The method is based on the co-transformation and transient co-expression of different PP2C proteins with MAPK. It shows that epitope-tagged PP2C and MAPK proteins exhibit high enzymatic activities and produce substantial protein amounts easily monitored by Western blot analysis. Additionally, PP2C phosphatase activities can be directly tested in protein extracts from protoplasts, suggesting a possibility for analysis of activities of new PP2C family members." @default.
- W114753366 created "2016-06-24" @default.
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- W114753366 date "2009-01-01" @default.
- W114753366 modified "2023-09-26" @default.
- W114753366 title "Phosphatase Activities Analyzed by in vivo Expressions" @default.
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- W114753366 doi "https://doi.org/10.1007/978-1-59745-289-2_16" @default.
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