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000908173 1001_ $$0P:(DE-HGF)0$$aKempmann, Annika$$b0
000908173 245__ $$aThe Functional Characterization of GCaMP3.0 Variants Specifically Targeted to Subcellular Domains
000908173 260__ $$aBasel$$bMolecular Diversity Preservation International$$c2022
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000908173 520__ $$aCalcium (Ca2+) ions play a pivotal role in physiology and cellular signaling. The intracellular Ca2+ concentration ([Ca2+]i) is about three orders of magnitude lower than the extracellular concentration, resulting in a steep transmembrane concentration gradient. Thus, the spatial and the temporal dynamics of [Ca2+]i are ideally suited to modulate Ca2+-mediated cellular responses to external signals. A variety of highly sophisticated methods have been developed to gain insight into cellular Ca2+ dynamics. In addition to electrophysiological measurements and the application of synthetic dyes that change their fluorescent properties upon interaction with Ca2+, the introduction and the ongoing development of genetically encoded Ca2+ indicators (GECI) opened a new era to study Ca2+-driven processes in living cells and organisms. Here, we have focused on one well-established GECI, i.e., GCaMP3.0. We have systematically modified the protein with sequence motifs, allowing localization of the sensor in the nucleus, in the mitochondrial matrix, at the mitochondrial outer membrane, and at the plasma membrane. The individual variants and a cytosolic version of GCaMP3.0 were overexpressed and purified from E. coli cells to study their biophysical properties in solution. All versions were examined to monitor Ca2+ signaling in stably transfected cell lines and in primary cortical neurons transduced with recombinant Adeno-associated viruses (rAAV). In this comparative study, we provide evidence for a robust approach to reliably trace Ca2+ signals at the (sub)-cellular level with pronounced temporal resolution
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000908173 7001_ $$0P:(DE-Juel1)131924$$aGensch, Thomas$$b1
000908173 7001_ $$0P:(DE-Juel1)128713$$aOffenhäusser, Andreas$$b2
000908173 7001_ $$0P:(DE-Juel1)162348$$aTihaa, Irina$$b3
000908173 7001_ $$0P:(DE-Juel1)128705$$aMaybeck, Vanessa$$b4$$ufzj
000908173 7001_ $$0P:(DE-Juel1)131909$$aBalfanz, Sabine$$b5
000908173 7001_ $$0P:(DE-Juel1)131911$$aBaumann, Arnd$$b6$$eCorresponding author
000908173 773__ $$0PERI:(DE-600)2019364-6$$a10.3390/ijms23126593$$gVol. 23, no. 12, p. 6593 -$$n12$$p6593 -$$tInternational journal of molecular sciences$$v23$$x1422-0067$$y2022
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