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Abstract
S-Nitrosylation has been found to play an important role in regulating mitochondrial function. However, probes for detection of protein S-nitrosylation in mitochondria remain unexplored. Herein, a novel 4-(pyridin-4-yl)vinyl-substituted indole was designed, exhibiting a long-wavelength emission and a high fluorescent quantum yield. Functionalization of the 7-position of the indole ring with an arylphosphine ester resulted with probes with efficient mitochondria-targeting ability. Furthermore, the indole-arylphosphine displayed a significant fluorescence enhancement upon exposure to S-nitrosoglutathione (GSNO) at low micromolar concentrations in A431 cells. Taken together, this study provides a new indole-based fluorescent probe with a unique long-wavelength emission for direct detection of S-nitrosylation in mitochondria, which may represent a powerful tool for understanding the critical roles of S-nitrosylation within mitochondria of living organisms.
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