Evaluation of the mass spectrometric fragmentation of codeine and morphine after 13C-isotope biosynthetic labeling
摘要:
All major fragment ions of codeine and morphine were elucidated using LC-electrospray MS/MS and high resolution FT-ICR-MS combined with an IRMPD system. Nanogram quantities of labeled codeine were isolated and purified from Papaver somniferum seedlings.. which were grown for up to 9 days in the presence of [ring-C-13(6)]-L-tyrosine, [ring-C-13(6)]-tyramine and [1,2-C-13(2)], [6-O-methyl C-13]-(R,S)-coclaurine. The labeling degree of codeine up to 57% into morphinans was observed. (C) 2004 Elsevier Ltd. All rights reserved.
Vibrational spectra contain unique information on protein structure and dynamics. However, this information is often obscured by spectral congestion, and site-selective information is not available. In principle, sites of interest can be spectrally identified by isotope shifts, but site-specific isotopelabeling of proteins is today possible only for favorable amino acids or with prohibitively low
振动光谱包含有关蛋白质结构和动力学的独特信息。然而,该信息通常被频谱拥塞所掩盖,并且站点选择性信息不可用。原则上,感兴趣的位点可以通过同位素位移进行光谱识别,但如今仅对有利的氨基酸或产量低得令人望而却步的蛋白质的位点特异性同位素标记是可能的。在这里,我们提出了一种有效的无细胞表达系统,用于将任何同位素标记的氨基酸定点掺入蛋白质中。我们从 100 mL 无细胞反应提取物中合成了 1.6 mg 绿色荧光蛋白和同位素标记的酪氨酸。我们明确地确定了时间分辨红外吸收光谱指纹区域中酪氨酸的光谱特征。动力学分析证实了光激发和质子转移之间存在一个持续时间为 3 ps 的中间状态。我们的方法将蛋白质的振动光谱提升到更高水平的结构特异性。
Controlled synthesis of labelled 3-L-chlorotyrosine-[ring-13C6] and of 3,5-L-dichlorotyrosine-[ring-13C6]
Evaluation of the mass spectrometric fragmentation of codeine and morphine after 13C-isotope biosynthetic labeling
作者:Chotima Poeaknapo、Ursula Fisinger、Meinhart H Zenk、Jürgen Schmidt
DOI:10.1016/j.phytochem.2004.05.005
日期:2004.5
All major fragment ions of codeine and morphine were elucidated using LC-electrospray MS/MS and high resolution FT-ICR-MS combined with an IRMPD system. Nanogram quantities of labeled codeine were isolated and purified from Papaver somniferum seedlings.. which were grown for up to 9 days in the presence of [ring-C-13(6)]-L-tyrosine, [ring-C-13(6)]-tyramine and [1,2-C-13(2)], [6-O-methyl C-13]-(R,S)-coclaurine. The labeling degree of codeine up to 57% into morphinans was observed. (C) 2004 Elsevier Ltd. All rights reserved.