Department of Chemistry, University of Toronto, Ontario, Canada.
Anal Biochem. 2011 Jan 1;408(1):157-9. doi: 10.1016/j.ab.2010.09.008. Epub 2010 Sep 16.
Inductively coupled plasma-mass spectrometry (ICP-MS)-based assays lend themselves to multiplexing due to the high resolution between mass channels, the sensitivity, and the reliability of the technique. Here the potential of ICP-MS-based protease assays is demonstrated with a quadruplex assay of cysteine proteases and metalloproteases. Four orthogonal peptide substrates were synthesized for the proteases calpain-1, caspase-3, matrix metalloprotease-9 (MMP-9), and a disintegrin and metalloprotease-10 (ADAM10). Each substrate carries a biotin tag at the C terminus and a diethylenetriaminepentaacetic acid (DTPA)-based lanthanide complex at the N terminus. The results demonstrate that this is a simple and reproducible analysis technique with excellent correlation between the single and multiplex assay formats.
基于电感耦合等离子体质谱法(ICP-MS)的测定方法由于质量通道之间的高分辨率、技术的灵敏度和可靠性而适合多重检测。本文展示了基于 ICP-MS 的蛋白酶测定方法的潜力,采用四重检测方法对半胱氨酸蛋白酶和金属蛋白酶进行检测。针对钙蛋白酶-1、半胱天冬酶-3、基质金属蛋白酶-9(MMP-9)和金属蛋白酶 10(ADAM10)这 4 种蛋白酶,合成了 4 种正交肽底物。每个底物的 C 端带有生物素标记,N 端带有二亚乙基三胺五乙酸(DTPA)基镧系元素络合物。结果表明,这是一种简单且可重现的分析技术,单重和多重测定方法之间具有极好的相关性。