An unnatural hydrophobic base, 4-propynylpyrrole-2-carbaldehyde, as an efficient pairing partner of 9-methylimidazo[(4,5)- b ]pyridine
作者:Tsuneo Mitsui、Michiko Kimoto、Akira Sato、Shigeyuki Yokoyama、Ichiro Hirao
DOI:10.1016/j.bmcl.2003.09.059
日期:2003.12
into DNA opposite Q by the Klenow fragment of Escherichia coli DNA polymerase I were improved, in comparison with those of the Q-Pa pair. These improvements result from the increased hydrophobicity and stacking stability of Pa' by the introduction of the propynyl group to Pa, providing valuable information for the further development of unnatural base pairs toward the expansion of the genetic alphabet
为了开发在复制中起作用的非天然碱基对,我们设计了4-丙炔基吡咯-2-甲醛(命名为Pa')并合成了Pa'的核苷衍生物。将Pa'与配对物9-甲基咪唑并[(4,5)-b]吡啶(Q)的碱基配对与先前开发为特定配对配对物的吡咯-2-甲醛(Pa)进行了配对相比之下,包含Q-Pa'对的DNA双链体的热稳定性以及通过DNA聚合酶I的Klenow片段提高了Pa'底物(dPa'TP)向与Q相反的DNA的掺入效率。与Q-Pa对 这些改进归因于通过将丙炔基引入Pa来增强Pa'的疏水性和堆积稳定性,