Four stereoisomers of oxy-peptide nucleic acids containing ether linkages in the main chain and conformationally-restricted pyrrolidine rings (pyrrolidine-based oxy-PNA = POPNA) were newly synthesized and investigated for binding to DNA. cis-L-POPNA with 9 adenine bases formed the most stable hybrid with dT9. The POPNA showed high sequence specificity similar to that of the Nielsen-type PNA and sharper melting behavior in hybridization with DNA than the Nielsen-type PNA.
研究人员新合成了四种立体异构体的氧基肽核酸,其主链中含有醚键和构象受限的
吡咯烷环(
吡咯烷基氧基
PNA = PO
PNA),并研究了它们与 DNA 的结合。与尼尔森型
PNA 相比,PO
PNA 表现出与尼尔森型
PNA 相似的高度序列特异性,并且在与 DNA 杂交时有更明显的熔化行为。