RNA-selective cross-pairing of backbone-extended pyrrolidine-amideoligonucleotide mimics (bePOMs)
作者:Roberta J. Worthington、Neil M. Bell、Raymond Wong、Jason Micklefield
DOI:10.1039/b714580m
日期:——
Pyrrolidine-amide oligonucleotide mimics (POMs) can cross-pair strongly with complementary parallel and antiparallel DNA and RNA targets in a sequence-specific fashion. As a result POMs have significant potential for applications including in vivogene silencing, diagnostics and bioanalysis. To further modulate the DNA- and RNA-recognition properties and fine-tune the physiochemical properties of POMs for nucleic acid targeting, backbone-extended pyrrolidine-amideoligonucleotide mimics (bePOM I and II) were introduced. The bePOMs differ from the original POMs through the insertion of an additional methylene group into the backbone units, which increases the flexibility of the oligomers. bePOM I and II oligomers were synthesised using solid-phase peptide chemistry. Interestingly, UV thermal denaturation and circular dichroism studies reveals bePOM I and II can hybridise with complementary RNA, but not DNA.
吡咯烷-酰胺低聚核苷酸模拟物(POMs)能够与互补的平行和反平行DNA及RNA靶标以序列特异性的方式强烈配对。因此,POMs在基因沉默、诊断和生物分析等应用方面具有显著的潜力。为了进一步调节POMs对DNA和RNA的识别特性,并微调其物理化学性质以实现核酸靶向,我们引入了骨架扩展的吡咯烷-酰胺低聚核苷酸模拟物(bePOM I和II)。bePOMs通过在骨架单元中插入一个额外的亚甲基,从而增加了寡聚物的柔韧性,与原始POMs有所不同。bePOM I和II寡聚物是通过固相肽化学合成制备的。有趣的是,紫外热变性和圆二色性研究表明,bePOM I和II能够与互补RNA杂交,但不能与DNA杂交。