Synthesis and Characterization of Conformationally Preorganized, (R)-Diethylene Glycol-Containing γ-Peptide Nucleic Acids with Superior Hybridization Properties and Water Solubility
摘要:
Developed in the early 1990s, peptide nucleic acid (PNA) has emerged as a promising class of nucleic acid mimic because of its strong binding affinity and sequence selectivity toward DNA and RNA and resistance to enzymatic degradation by proteases and nucleases; however, the main drawbacks, as compared to other classes of oligonucleotides, are water solubility and biocompatibility. Herein we show that installation of a relatively small, hydrophilic (R)-diethylene glycol ("miniPEG", R-MP) unit at the gamma-backbone transforms a randomly folded PNA into a right-handed helix. Synthesis of optically pure (R-MP)gamma PNA monomers is described, which can be accomplished in a few simple steps from a commercially available and relatively cheap Boc-L-serine. Once synthesized, (R-MP)gamma PNA oligomers are preorganized into a right-handed helix, hybridize to DNA and RNA with greater affinity and sequence selectivity, and are more water soluble and less aggregating than the parental PNA oligomers. The results presented herein have important implications for the future design and application of PNA in biology, biotechnology, and medicine, as well as in other disciplines, including drug discovery and molecular engineering.
Synthesis and characterization of (R)-miniPEG-containing chiral γ-peptide nucleic acids using the Fmoc strategy
作者:Bo Dong、Kaixuan Nie、Huanhuan Shi、Xiaoxia Yao、Lemeng Chao、Bo Liang、Zhengchun Liu
DOI:10.1016/j.tetlet.2019.04.038
日期:2019.5
(miniPEG)-containing chiral γPNA is considered to be one of the best PNA derivatives. Its preparation is mainly based on the Boc strategy for solidphase peptide synthesis (SPPS), requiring the repeated use of trifluoroacetic acid TFA, which is not suitable for the in situ synthesis of PNA arrays and some other applications undermildconditions. Herein, Fmoc/Cbz orthogonal protected miniPEG-containing chiral γPNA