Photoconjugation of 3-azido-5-nitrobenzyl-[18F]fluoride to an oligonucleotide aptamer
作者:Christopher W. Lange、Henry F. VanBrocklin、Scott E. Taylor
DOI:10.1002/jlcr.565
日期:2002.3.15
Photoconjugation techniques are well established in biochemistry and molecular biology applications. We report here the first application of photoconjugation to label an oligonucleotide with positron emitting fluorine-18. ANBF, 3-azido-5-nitrobenzyl fluoride, was tagged with fluorine-18 in 30–50% yield from the corresponding tosylate. The HPLC purified [18F]ANBF was photochemically conjugated to a hexylamine modified 15-base, single stranded, DNA aptamer with up to 20% radiolabeling efficiency, based on starting [18F]ANBF. Separation by gel exclusion chromatography and HPLC analysis of the DNA fractions indicated that the benzyl fluoride was covalently bound to the aptamer. The total reaction time from the start of radiosynthesis was 135 min. Based on these results, the feasibility to photolabel oligonucleotide molecules with fluorine-18 labeled arylazides for PET applications has been established. Copyright © 2002 John Wiley & Sons, Ltd.
光共轭技术在生物化学和分子生物学领域的应用已经非常成熟。我们在此报告首次应用光共轭技术用正电子发射的氟-18 标记寡核苷酸。用氟-18 标记 3-叠氮-5-硝基苄基氟化物(ANBF)时,相应的对甲苯磺酸盐的收率为 30-50%。HPLC 纯化的[18F]ANBF 通过光化学方法与六胺修饰的 15 个碱基、单链 DNA 类似物连接,辐射标记效率高达 20%(基于起始[18F]ANBF)。通过凝胶排阻色谱法分离和高效液相色谱法分析 DNA 产物表明,苄基氟化物与适配体发生了共价结合。从放射性合成开始,反应总时间为 135 分钟。基于这些结果,用氟-18 标记的芳基氮化物对寡核苷酸分子进行光标记以用于 PET 的可行性已经得到证实。Copyright © 2002 John Wiley & Sons, Ltd. All Rights Reserved.