Synthesis and DNA-recognition behavior of a novel peptide ribonucleic acid with a serine backbone (oxa-PRNA)
作者:Nobuya Sawa、Takehiko Wada、Yoshihisa Inoue
DOI:10.1016/j.tet.2009.10.094
日期:2010.1
(2S)-2-Fmoc-amino-3-(5'-deoxyuridinylamino)-3-oxopropyloxyacetic acid was synthesized from L-serine as a monomer for preparing the second-generation peptide ribonucleic acid with an oxa-peptide backbone (oxa-PRNA). The ether linkage was incorporated to improve the modest solubility in aqueous solution of the original PRNA with an iso-glutamine backbone, without harming the ability of the aminouridine side chain to switch the anti/syn nucleobase orientation by adding borax. Indeed, CD spectral examinations revealed that the Fmoc-protected oxa-PRNA uridine monomer (Fmoc-oxa-PRNA(U)), synthesized in three steps, switched the nucleobase orientation from anti to syn in phosphate buffer upon addition of borax. Homo-12mers of oxa-PRNA(U) with and without Arg end caps were prepared in moderate yields by the Fmoc solid-phase synthesis. Both of the N- and C-terminus-capped oxa-PRNA(U) 12mers thus synthesized were shown to hybridize with the complementary DNA 12mer (d(A(12))) with stabilities comparable to that observed for the natural pair. (C) 2009 Elsevier Ltd. All rights reserved.
以 L-丝氨酸为原料合成了一种单体:(2S)-2-Fmoc-氨基-3-(5'-脱氧尿苷基氨基)-3-氧基丙基氧基乙酸,用于制备具有氧肽主链的第二代肽核糖核酸(o xa-PRNA)。将醚键引入其中,以改善原有异谷氨酰胺主链PRNA在水溶液中的一般溶解度,而不会损害氨基尿苷侧链通过添加硼砂来切换反式/顺式核碱基取向的能力。实际上,圆二色光谱研究表明,Fmoc保护的oxa-PRNA尿苷单体(Fmoc-oxa-PRNA(U))通过三步合成,加入硼砂后在磷酸盐缓冲液中将核碱基取向从反式切换到顺式。通过Fmoc固定相合成,以适中产率制备了具有和不具有Arg末端帽的oxa-PRNA(U)同源-12聚体。因此合成的N-和C-末端加帽的oxa-PRNA(U) 12聚体均被证明可以与互补的DNA 12聚体(d(A(12)))杂交,且稳定性与自然对的观察结果相当。(C) 2009 Elsevier Ltd. All rights reserved.