Publications by authors named "Philip Mueller-Thuemen"

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Establishing a Split Luciferase Assay for Proteinkinase G (PKG) Interaction Studies.

Int J Mol Sci 2018 Apr 12;19(4). Epub 2018 Apr 12.

Department of Pharmacology and Toxicology, University of Regensburg, 93053 Regensburg, Germany.

Nitric oxide (NO/cyclic guanosine monophosphate (cGMP)-regulated cellular mechanisms are involved in a variety of (patho-) physiological processes. One of the main effector molecules in this system, proteinkinase G (PKG), serves as a molecular switch by phosphorylating different target proteins and thereby turning them on or off. To date, only a few interaction partners of PKG have been described although the identification of protein-protein interactions (PPI) is indispensable for the understanding of cellular processes and diseases. Conventionally used methods to detect PPIs exhibit several disadvantages, e.g., co-immunoprecipitations, which depend on suitable high-affinity antibodies. Therefore, we established a cell-based protein-fragment complementation assay (PCA) for the identification of PKG target proteins. Here, a reporter protein ( luciferase) is split into two fragments and fused to two different possible interaction partners. If interaction occurs, the reporter protein is functionally complemented and the catalyzed reaction can then be quantitatively measured. By using this technique, we confirmed the regulator of G-Protein signaling 2 (RGS2) as an interaction partner of PKGI╬▒ (a PKG-isoform) following stimulation with 8-Br-cGMP and 8-pCPT-cGMP. Hence, our results support the conclusion that the established approach could serve as a novel tool for the rapid, easy and cost-efficient detection of novel PKG target proteins.
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http://dx.doi.org/10.3390/ijms19041180DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5979328PMC
April 2018