To test the feasibility of using 77Se NMR to distinguish between different proposed mechanisms of action of the selenoenzyme glutathione peroxidase, model compounds containing the proposed selenium moieties have been synthesized and their 77Se NMR spectra recorded. It was found that the difference in chemical shift between the two proposed resting states, selenol or selenenic acid, is approximately
为了测试使用 77Se NMR 区分
硒酶
谷胱甘肽过氧化物酶的不同拟议作用机制的可行性,合成了含有拟议
硒部分的模型化合物,并记录了它们的 77Se NMR 光谱。发现两种建议的静止状态
硒醇或
硒酸之间的
化学位移差异约为 1300 ppm。对于下一步,通过
过氧化氢进行
氧化,发现
硒酸和
硒酸种类之间的差异要小得多,约为 100 ppm。第二个反应步骤的产物,
硫化硒与
硫化硒,
化学位移相差约 470 ppm。得出的结论是,对于酶的三种状态中的两种,原则上 77Se NMR 可以明确用于区分两种提议的机制。