Mapping the Landscape of Potentially Primordial Informational Oligomers: (3′→2′)‐
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‐Phosphoglyceric Acid Linked Acyclic Oligonucleotides Tagged with 2,4‐Disubstituted 5‐Aminopyrimidines as Recognition Elements
作者:Marcos Hernández‐Rodríguez、Jian Xie、Yazmin M. Osornio、Ramanarayanan Krishnamurthy
DOI:10.1002/asia.201000828
日期:2011.5.2
The (3′→2′)‐phosphodiester glyceric acid backbone containing an acyclic oligomer tagged with 2,4‐disubstituted pyrimidines as alternative recognition elements have been synthesized. Strong cross‐pairing of a 2,4‐dioxo‐5‐aminopyrimidine hexamer, rivaling locked nucleic acid (LNA) and peptide nucleic acid (PNA), with complementary adenine‐containing DNA and RNA sequences was observed. The corresponding
合成了(3'→2')-磷酸二酯甘油酸骨架,其中包含带有2,4-二取代嘧啶标记的无环低聚物作为替代识别元件。观察到2,4-二氧杂-5-氨基嘧啶六聚体与锁定核酸(LNA)和肽核酸(PNA)相互竞争,并与含腺嘌呤的互补DNA和RNA序列发生强烈交叉配对。合成了相应的2,4-二氨基-氨基和2-氨基-4-氧代-5-氨基嘧啶标记的低聚物,但脱保护,纯化和分离的困难阻碍了进一步的研究。受保护的低聚物的无环磷酸酯主链结构似乎由于2'-位的酸性氢而易于消除降解,这种排列使该低聚物易受用于去除杂环上保护基的条件的影响识别元素。但是,游离的低聚物在所研究的条件下似乎是稳定的。