申请人:——
公开号:US20030194759A1
公开(公告)日:2003-10-16
The ability to synthesize capped RNA transcripts in vitro has been of considerable value in a variety of applications. However, one-third to one-half of the caps have, until now, been incorporated in the reverse orientation. Such reverse caps impair the translation of in vitro-synthesized mRNAs. Novel cap analogues, such as P
1
-3′-deoxy-7-methylguanosine-5′P
3
-guanosine-5′triphosphate and P
1
-3′-O,7-dimethylguanosine-5′P
3
-guanosine-5′triphosphate, have been designed that are incapable of being incorporated into RNA in the reverse orientation. Transcripts produced with SP6 polymerase using “anti-reverse” cap analogues were of the predicted length. Analysis of the transcripts indicated that reverse caps were not formed. The in vitro translational efficiency of transcripts with the novel “anti-reverse” cap analogues was significantly higher than that of transcripts formed with conventional caps.
在体外合成带帽RNA转录本的能力在各种应用中具有相当的价值。然而,直到现在,三分之一到一半的帽子都是以反向方向合并的。这种反向帽子会影响体外合成的mRNA的翻译。已经设计出了新的帽子类似物,例如P1-3'-去氧-7-甲基鸟嘌呤-5'P3-鸟嘌呤-5'三磷酸和P1-3'-O,7-二甲基鸟嘌呤-5'P3-鸟嘌呤-5'三磷酸,它们不能以反向方向被合并到RNA中。使用“反向”帽子类似物的SP6聚合酶产生的转录本长度与预期相同。转录本的分析表明没有形成反向帽子。具有新的“反向”帽子类似物的转录本的体外翻译效率显着高于使用传统帽子形成的转录本。