Abstract
Photoactivatable subcellular organelles imaging offers the desirable spatiotemporal resolution in studying the complex biological processes. Developing proper and simple photoremovable protecting groups (PPGs) is the key for constructing such imaging probes. In this study, we designed and synthesized three Sanger's reagent caged fluorescent probes for specific photoactivated organelle imaging. We showed the photoactivated fluorescence recovery of the probes. The photolysis mechanism was verified by mass spectra (MS) analysis, and the highly efficient photolysis process was monitored by high performance liquid chromatography (HPLC). The probes successfully imaged their respective targeted organelle, including mitochondria, lysosomes, and endoplasmic reticulum (ER), in a photoactivated manner, and exhibited high co-localization coefficients when compared to commercially available probes. Given the high reactivity and efficient photodissociation capability of Sanger's reagent with amino groups, our examples demonstrate the potential of Sanger's reagent as a novel general PPG for constructing photoactivatable fluorescent probes.
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