Spontaneous Aminoacylation of a RNA Sequence Containing a 3′-Terminal 2′-Thioadenosine
作者:Sébastien Porcher、Muthuppalaniappan Meyyappan、Stefan Pitsch
DOI:10.1002/hlca.200590233
日期:2005.11
We report the synthesis of a modified 8mer RNA sequence, (C-C-C-C-A-C-C-(2′-thio)A)-RNA 5′-(dihydrogen phosphate) (9) containing a 3′-terminal 2′-thioadenosine (Schemes 2 and 3), and its spontaneous and site-specific aminoacylation with the weakly activated amino acid thioester HPheSPh (12). This reaction, designed in analogy to the ‘native chemical ligation’ of oligopeptides, occurs efficiently in
我们报告了合成的8mer RNA修饰序列(CCCCACC-(2'-thio)A)-RNA 5'-(磷酸二氢)(9)的合成,其中包含3'-末端2'-硫代腺苷(方案2和3) ,以及其与弱活化氨基酸硫酯HPheSPh的自发和位点特异性氨酰化作用(12)。该反应的设计类似于寡肽的“天然化学连接”,可在缓冲水溶液中和多种条件下有效进行(表)。在5.0到7.4之间的pH值下,两种产物3'- O-单酰化和3'- O,2'- S-二酰化RNA序列10和11快速且定量地形成(方案4)。在pH 7.4和37°下,通过选择性水解O,S-二酰化前体11原位形成3'- O-单酰化产物10作为主要产物。另外,相关的3'- O-单酰化产物10的制备和分离在pH 5下被优化。这里提出的概念可以用于类似修饰的tRNA的直接氨酰化。