Synthesis and Evaluation of β-Galactosidase-Targeting Spin-Label Probe: 5-O-β-D-Galactosyl-5-hydroxy-1,1,3,3-tetramethylisoindoline-2-oxyl
作者:Shingo Sato、Koya Sugawara、Hiroyuki Konno、Tomohiro Ito
DOI:10.3987/com-20-14317
日期:——
In this study, 3-hydroxymethyl-2,2,5,5-tetramethylpyrrolidine-1-oxyl, 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl, and 5-hydroxy-1,1,3,3-tetramethylisoindoline-2-oxyl O-galactosides (PG, TG, and IG) were synthesized. Moreover, their reduction reactivity (RR) for ascorbic acid and hydrolysis reactivity (HR) for β-galactosidase were measured via electron paramagnetic resonance (EPR) spectroscopy and
在这项研究中,3-羟基甲基-2,2,5,5-四甲基吡咯烷-1-氧基,4-羟基-2,2,6,6-四甲基哌啶-1-氧基和5-羟基-1,1,3合成了3-3-四甲基异吲哚啉-2-氧基O-半乳糖苷(PG,TG和IG)。此外,它们对抗坏血酸的还原反应(RR)和对β的水解反应(HR)-半乳糖苷酶分别通过电子顺磁共振(EPR)光谱和高效液相色谱(HPLC)测定。发现这两个反应的两个速率常数均显示以下顺序:RR:TG> IG> PG,HR:IG> PG> TG。根据体外测定的结果,选择IG作为生物测定的候选者。HeLa细胞(癌细胞)和PC12细胞(正常细胞)对IG的生物分析表明,添加IG 20分钟后,癌细胞中的一氧化氮自由基比正常细胞中的多,而它们的EPR强度却很低。