PNA containing isocytidine nucleobase: Synthesis and recognition of double helical RNA
摘要:
Peptide nucleic acid (PNA1) containing a 5-methylisocytidine (iC) nucleobase has been synthesized. Triple helix formation between PNA1 and RNA hairpins having variable base pairs interacting with iC was studied using isothermal titration calorimetry. The iC nucleobase recognized the proposed target, C-G inversion in polypurine tract of RNA, with slightly higher affinity than the natural nucleobases, though the sequence selectivity of recognition was low. Compared to non-modified PNA, PNA1 had lower affinity for its RNA target. (C) 2011 Elsevier Ltd. All rights reserved.
Templated Synthesis of Peptide Nucleic Acids via Sequence-Selective Base-Filling Reactions
作者:Jennifer M. Heemstra、David R. Liu
DOI:10.1021/ja904712t
日期:2009.8.19
The templated synthesis of nucleic acids has previously been achieved through the backbone ligation of preformed nucleotide monomers or oligomers. In contrast, here we demonstrate templated nucleic acid synthesis using a base-filling approach in which individual bases are added to abasic sites of a peptide nucleic acid (PNA). Because nucleobase substrates in this approach are not self-reactive, a base-filling