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Deprecated: Implicit conversion from float 261.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Mol+Cell+Proteomics 2015 ; 14 (3): 707-23 Nephropedia Template TP
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Monitoring Interactions and Dynamics of Endogenous Beta-catenin With Intracellular Nanobodies in Living Cells* #MMPMID25595278
Traenkle B; Emele F; Anton R; Poetz O; Haeussler RS; Maier J; Kaiser PD; Scholz AM; Nueske S; Buchfellner A; Romer T; Rothbauer U
Mol Cell Proteomics 2015[Mar]; 14 (3): 707-23 PMID25595278show ga
?-catenin is the key component of the canonical Wnt pathway and plays a crucial role in a multitude of developmental and homeostatic processes. The different tasks of ?-catenin are orchestrated by its subcellular localization and participation in multiprotein complexes. To gain a better understanding of ?-catenin's role in living cells we have generated a new set of single domain antibodies, referred to as nanobodies, derived from heavy chain antibodies of camelids. We selected nanobodies recognizing the N-terminal, core or C-terminal domain of ?-catenin and applied these new high-affinity binders as capture molecules in sandwich immunoassays and co-immunoprecipitations of endogenous ?-catenin complexes. In addition, we engineered intracellularly functional anti-?-catenin chromobodies by combining the binding moieties of the nanobodies with fluorescent proteins. For the first time, we were able to visualize the subcellular localization and nuclear translocation of endogenous ?-catenin in living cells using these chromobodies. Moreover, the chromobody signal allowed us to trace the accumulation of diffusible, hypo-phosphorylated ?-catenin in response to compound treatment in real time using High Content Imaging. The anti-?-catenin nanobodies and chromobodies characterized in this study are versatile tools that enable a novel and unique approach to monitor the dynamics of subcellular ?-catenin in biochemical and cell biological assays.