Electrochemical Molecular Switch for the Selective Profiling of Cysteine in Live Cells and Whole Blood and for the Quantification of Aminoacylase-1
作者:T. S. T. Balamurugan、Chih-Hung Huang、Pu-Chieh Chang、Sheng-Tung Huang
DOI:10.1021/acs.analchem.8b02799
日期:2018.11.6
A first-of-a-kind latent electrochemical redox probe, ferrocene carbamate phenyl acrylate (FCPA), was developed for the selective detection of cysteine (Cys) and aminoacylase (ACY-1). The electrochemical signal generated by this probe was shown to be highly specific to Cys and insensitive to other amino acids and biological redox reactants. The FCPA-incorporated electrochemical sensor exhibited a broad dynamic range of 0.25–100 μM toward Cys. This probe also proficiently monitored the ACY-1-catalyzed biochemical transformation of N-acetylcysteine (NAC) into Cys, and this proficiency was used to develop an electrochemical assay for quantifying active ACY-1, which it did so in a dynamic range of 10–200 pM (0.1–2 mU/cm3) with a detection limit of 1 pM (0.01 mU/cm3). Furthermore, the probe was utilized in real-time tracking and quantification of cellular Cys production, specifically in Escherichia coli W3110, along with a whole blood assay to determine levels of Cys and spiked ACY-1 in blood with a reliable analytical performance.
研究人员开发了一种首创的潜伏电化学氧化还原探针--二茂铁氨基甲酸苯基丙烯酸酯(FCPA),用于选择性检测半胱氨酸(Cys)和氨基乙酰化酶(ACY-1)。该探针产生的电化学信号对 Cys 具有高度特异性,而对其他氨基酸和生物氧化还原反应物不敏感。融入 FCPA 的电化学传感器对 Cys 具有 0.25-100 μM 的宽动态范围。该探针还能熟练监测 ACY-1 催化的 N-乙酰半胱氨酸(NAC)向 Cys 的生化转化,并利用这种熟练程度开发了一种电化学检测方法来定量检测活性 ACY-1,其动态范围为 10-200 pM(0.1-2 mU/cm3),检测限为 1 pM(0.01 mU/cm3)。此外,该探针还被用于实时跟踪和量化细胞中 Cys 的产生,特别是在大肠杆菌 W3110 中,同时还被用于全血检测,以可靠的分析性能确定血液中 Cys 和添加的 ACY-1 的水平。