In order to develop efficient methods that would enable the synthesis of posttranslationaly modified proteins in a site-specific manner we have adopted the orthogonal pyrrolysyl-tRNA synthetase/tRNA pair to genetically encode various pyrrolysine analogs, which we were able to insert into the yellow fluorescent protein (YFP). These experiments showed that the alkene and alkyne containing amino acids5and6are superior substrates for the pyrrolysyl-tRNA synthetase and that they can be successfully incorporated into proteins. Using the Cu(I)-catalyzed Huisgen–Meldal–Sharpless click reaction, the alkyne containing YFP was finally glycosylated with various sugars. We confirmed the presence of the modified amino acids as well as the corresponding sugar modifications by HPLC-MS/MS mass spectrometry.
为了开发能够以特定位置合成后转录修饰蛋白质的高效方法,我们采用了正交的吡咯赖氨酰-tRNA合成酶/tRNA对来遗传编码各种吡咯赖氨酸类似物,我们成功地将其插入了黄色荧光蛋白(YFP)中。这些实验表明,含有烯烃和炔烃的氨基酸5和6是吡咯赖氨酰-tRNA合成酶的优良底物,它们可以成功地被合成到蛋白质中。通过Cu(I)催化的Huisgen–Meldal–Sharpless click反应,含有炔烃的YFP最终被各种糖基化。我们通过HPLC-MS/MS质谱技术确认了修饰的氨基酸以及对应的糖基修饰的存在。