Abstract
Generation of the prototypic second messenger cAMP instigates numerous signaling events. A major intracellular target of cAMP is Protein kinase A (PKA), a Ser/Thr protein kinase. Where and when this enzyme is activated inside the cell has profound implications on the functional impact of PKA. It is now well established that PKA signaling is focused locally into subcellular signaling “islands” or “signalosomes.” The A-Kinase Anchoring Proteins (AKAPs) play a critical role in this process by dictating spatial and temporal aspects of PKA action. Genetically encoded biosensors, small molecule and peptide-based disruptors of PKA signaling are valuable tools for rigorous investigation of local PKA action at the biochemical level. This chapter focuses on approaches to evaluate PKA signaling islands, including a simple assay for monitoring the interaction of an AKAP with a tunable PKA holoenzyme. The latter approach evaluates the composition of PKA holoenzymes, in which regulatory subunits and catalytic subunits can be visualized in the presence of test compounds and small-molecule inhibitors.
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Acknowledgments
This work was supported, in whole or in part, by and BBSRC grants BB/S018514/1, BB/N021703/1, and BB/R000182/1 to D.B. and P.A.E., and National Institutes of Health Grants 1K22CA154600 to EJK, F32DK121415 to MO and NIH DK119186 and DK119192 to J.D.S
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Byrne, D.P., Omar, M.H., Kennedy, E.J., Eyers, P.A., Scott, J.D. (2022). Biochemical Analysis of AKAP-Anchored PKA Signaling Complexes. In: Zaccolo, M. (eds) cAMP Signaling. Methods in Molecular Biology, vol 2483. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2245-2_19
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