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• W2130678936 abstract "We have selected designed ankyrin repeat proteins (DARPins) from a synthetic library by using ribosome display that selectively bind to the mitogen-activated protein kinase ERK2 (extracellular signal-regulated kinase 2) in either its nonphosphorylated (inactive) or doubly phosphorylated (active) form. They do not bind to other kinases tested. Crystal structures of complexes with two DARPins, each specific for one of the kinase forms, were obtained. The two DARPins bind to essentially the same region of the kinase, but recognize the conformational change within the activation loop and an adjacent area, which is the key structural difference that occurs upon activation. Whereas the rigid phosphorylated activation loop remains in the same form when bound by the DARPin, the more mobile unphosphorylated loop is pushed to a new position. The DARPins can be used to selectively precipitate the cognate form of the kinases from cell lysates. They can also specifically recognize the modification status of the kinase inside the cell. By fusing the kinase with Renilla luciferase and the DARPin to GFP, an energy transfer from luciferase to GFP can be observed in COS-7 cells upon intracellular complex formation. Phosphorylated ERK2 is seen to increase by incubation of the COS-7 cells with FBS and to decrease upon adding the ERK pathway inhibitor PD98509. Furthermore, the anti-ERK2 DARPin is seen to inhibit ERK phosphorylation as it blocks the target inside the cell. This strategy of creating activation-state-specific sensors and kinase-specific inhibitors may add to the repertoire to investigate intracellular signaling in real time." @default.
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• W2130678936 date "2012-07-27" @default.
• W2130678936 modified "2023-10-12" @default.
• W2130678936 title "Structural and functional analysis of phosphorylation-specific binders of the kinase ERK from designed ankyrin repeat protein libraries" @default.
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• W2130678936 doi "https://doi.org/10.1073/pnas.1205399109" @default.
• W2130678936 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3427131" @default.
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