Abstract
Nitric oxide (NO) is a pleiotropic signaling molecule involved in the regulation of diverse physiological and pathophysiological mechanisms in cardiovascular, nervous, and immunological systems. To understand the biological functions of NO in detail, comprehensive characterization of proteins found in high-NO concentration environments is crucial. Herein, we describe the design of NO-responsive protein labeling reagents based on N-alkoxyacyl- o-phenylenediamine as an optimal reactive scaffold. The designed molecules can label proteins in murine macrophage cells in response to endogenously produced NO. The combination of NO-responsive protein labeling and liquid chromatography-tandem mass spectrometry technology allowed the characterization of the proteome under NO-generated conditions. Moreover, we demonstrated that our reagent was able to selectively mark and be used to fluorescently visualize NO-producing cells in a mixed cell culture system.
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