Functional Dihydro-1<i>H</i>-Imidazole Derivatives for MALDI Signal Enhancement of a Lysine-Specific Chemical Modification
作者:Ming-Yi Ho、Yu-Tse Shieh、Chung-Lin Liao、Yau-Hung Chen、Chien-Chung Cheng
DOI:10.1002/jccs.200900144
日期:2009.10
The enhancement of signal sensitivity and quantification of low‐abundance proteins is of great importance in proteomic analysis. The preparation of 2‐methoxy‐4,5‐dihydro‐1H‐imidazole (MeO‐DHIM) derivatives was accomplished by one‐step synthesis of O‐methyl‐isourea. The signal enhancement induced by these attached moieties increases in an order of compound 1 ≈︁ 4 < 2 < 5 ≈︁ 6 < 3 in MALDI mass spectrometry
信号敏感性的增强和低丰度蛋白质的定量在蛋白质组学分析中非常重要。2-甲氧基-4,5-二氢-1 H-咪唑(MeO-DHIM)衍生物的制备是通过O-甲基-异脲的一步合成完成的。在MALDI质谱分析中,由这些连接的部分诱导的信号增强顺序按化合物1≈︁4 < 2 < 5≈︁6 < 3的顺序增加。肽化合物3加合物是未修饰肽信号增强的20倍,是肽化合物1信号增强的9倍加合物。该结果表明,合理设计的有机分子能够为蛋白质组学中低丰度蛋白质的检测提供灵敏的工具。