A new fluorogenic reagent aimed at simultaneous determination of peptides or proteins in two different samples
作者:Hiroshi Saimaru、Mayumi Masuda、Chifuyu Toriumi、Tomofumi Santa、Eiko Ichikawa、Norio Takamura、Kazuhiro Imai
DOI:10.1039/b500897b
日期:——
Previously, we have synthesized a thiol specific fluorogenic reagent, 7-chloro-N-[2-(dimethylamino)ethyl]-2,1,3-benzoxadiazole-4-sulfonamide (DAABD-Cl) and derivatized protein mixtures, isolated the derivatives by HPLC, followed by enzymatic digestion and identification of the derivatized proteins by HPLC-electrospray ionization mass spectrometry (ESI-MS/MS) with the probability-based protein identification algorithm (FD-LC-MS/MS method)
(M. Masuda et al., Anal. Chem., 2004, 76, 728). The emission wavelengths for the DAABD derivatives of proteins were 510 nm with an excitation wavelength of 380 nm. In this paper, a new thiol specific fluorogenic reagent, 7-fluoro-N-[2-(dimethylamino)ethyl]-2,1,3-benzoselenadiazole-4-sulfonamide (DAABSeD-F) was synthesized. It reacted with thiols of peptides and proteins to give fluorescence. The respective excitation and emission wavelengths of the DAABSeD derivatives of proteins were about 30 nm and 40 nm red shifted from those of the DAABD proteins. These properties would be appropriate for its use in combination with DAABD-Cl as a counterpart for the simultaneous detection, ratio calculation and identification of peptides or proteins produced under the different conditions. Thus, DAABSeD-F could be an additional supportive reagent for the FD-LC-MS/MS method.
此前,我们合成了一种巯基特异性荧光显色剂7-氯-N-[2-(二甲氨基)乙基]-2,1,3-苯并噁二唑-4-磺酰胺(DAABD-Cl),用它标记蛋白质混合物,通过HPLC分离衍生物,然后进行酶解并用HPLC-电喷雾电离质谱(ESI-MS/MS)联用技术结合基于概率的蛋白质鉴定算法来鉴定标记的蛋白质(FD-LC-MS/MS方法)。DAABD标记的蛋白质的发射波长为510nm,激发波长为380nm。本文中,我们合成了一种新的巯基特异性荧光显色剂7-氟-N-[2-(二甲氨基)乙基]-2,1,3-苯并硒二唑-4-磺酰胺(DAABSeD-F)。它可与肽和蛋白质的巯基反应产生荧光。与DAABD标记的蛋白质相比,DAABSeD标记的蛋白质的激发波长和发射波长分别红移了约30nm和40nm。这些性质使其适合与DAABD-Cl配合使用,可同时检测、计算比值并鉴定在不同条件下产生的肽或蛋白质。因此,DAABSeD-F可作为FD-LC-MS/MS方法的一个额外辅助试剂。