Use of19F NMR spectroscopy to probe enzymatic oxidation of fluorine-tagged sulfides
作者:Behnaz Behrouzian、Derek Hodgson、Christopher K. Savile、Brian Dawson、Peter H. Buist、John Shanklin
DOI:10.1002/mrc.1052
日期:2002.8
A novel 19F NMR-based method for monitoring the enzymatic oxidation of thia fatty acid analogues is presented. Our approach is based on the observation that methyl ω-monofluorinated 9-thia- and 10-thiaoctadecanoates and their S-oxide and S-dioxide derivatives are easily distinguishable via their 1H-decoupled 19F spectra. These long-range substituent effects were used to probe the regio- and chemoselectivity of stearoyl ACP (acyl carrier protein) Δ9 desaturase-mediated sulfoxidation. The results clearly demonstrate that mono-oxygenation of a 10-thia analogue ACP Δ9 desaturase was more efficient than that of a 9-thia substrate. A product previously undetected by TLC was observed for the first time in the product mixture obtained from 18-fluoro-9-thiaoctadecanoyl-ACP. Copyright © 2002 John Wiley & Sons, Ltd.
提出了一种新的基于19F NMR的方法,用于监测硫脂肪酸类似物的酶促氧化。我们的方法基于观察到的结果:甲基ω-单氟化的9-硫和10-硫十八烷酸酯及其S-氧化物和S-二氧化物衍生物通过其1H解耦的19F光谱容易区分。这些远程取代基效应被用于探测硬脂酰ACP(酰基转运蛋白)Δ9去饱和酶介导的亚砜化的区域选择性和化学选择性。结果清楚地表明,10-硫类似物的ACP Δ9去饱和酶的单氧化效率高于9-硫底物。首次在从18-fluoro-9-thiaoctadecanoyl-ACP获得的产物混合物中观察到了早先未被薄层色谱检测到的产物。版权 © 2002 John Wiley & Sons, Ltd.