Rhodamine-N3 chloride is an azide-rhodamine fluorescent dye that can be used to label biomolecules containing alkyne groups[1][2].
The cell lysates or cells are treated with probes (0.001-10 μM, 1 hr), and then reacted with an Rhodamine-N3 (N3-Rh) reporter tag under copper-catalyzed azide-alkyne cycloaddition (CuACC or click chemistry) conditions and probe-labeled proteins visualized by SDS-PAGE and in-gel fluorescence scanning[2].
[1]. Shijiao Cai, et al. Glycyrrhizic Acid-Induced Differentiation Repressed Stemness in Hepatocellular Carcinoma by Targeting c-Jun N-Terminal Kinase 1. Front Oncol. 2020 Jan 9;9:1431. [2]. Bryan R Lanning, et al. A road map to evaluate the proteome-wide selectivity of covalent kinase inhibitors. Nat Chem Biol. 2014 Sep;10(9):760-767.