The present invention relates to methods of transferring a label from novel substrates to O
6
-alkylguanine-DNA alkyltransferases (AGT) and O
6
-alkylguanine-DNA alkyltransferase fusion proteins, and to novel substrates suitable in such methods. Proteins of interest are incorporated into an AGT fusion protein, the AGT fusion protein is contacted with particular AGT substrates carrying a label, and the AGT fusion protein is detected and optionally further manipulated using the label in a system designed for recognising and/or handling the label. The particular AGT substrates used in the method of the invention are O
6
-substituted guanine derivatives or related nitrogen containing hydroxy-heterocycles and their sulfur analogs wherein the O
6
-substituent is an activated methyl derivative suitable for transfer from guanine or the corresponding heterocycle to AGT, and further carrying a label or a plurality of same or different labels. The invention relates also to the novel AGT substrates as such, to methods of manufacture of such novel substrates, and to intermediates useful in the synthesis of such novel AGT substrates.
本发明涉及将标签从新型底物转移至O6-烷基
鸟嘌呤-DNA烷基转移酶(AGT)和O6-烷基
鸟嘌呤-DNA烷基转移酶融合蛋白质的方法,以及适用于这种方法的新型底物。感兴趣的蛋白质被并入AGT融合蛋白质中,AGT融合蛋白质与携带标签的特定AGT底物接触,并使用系统识别和/或处理标签来检测AGT融合蛋白质并可选地进一步操作。本发明中使用的特定AGT底物是O6取代
鸟嘌呤衍
生物或相关
氮含杂环
氢氧基化合物及其
硫化物,其中O6取代基是适合从
鸟嘌呤或相应杂环到AGT转移的活性
甲基衍
生物,并进一步携带一个标签或多个相同或不同的标签。本发明还涉及新型AGT底物本身,制造这种新型底物的方法,以及合成这种新型AGT底物的
中间体。