Structure-Activity Studies of the Binding of Modified Peptide Nucleic Acids (PNAs) to DNA
作者:Birgitte Hyrup、Michael Egholm、Peter E. Nielsen、Pernilla Wittung、Bengt Norden、Ole Buchardt
DOI:10.1021/ja00097a002
日期:1994.9
Peptide nucleic acid (PNA) oligomers where one of the repeating backbone units is extended with a methylene group to either N-(2-aminoethyl)-beta-alanine or N-(3-aminopropyl)glycine were prepared. Alternatively, the linker to the nucleobase was extended from methylenecarbonyl to ethylenecarbonyl. The thermal stability of the hybrids between these PNA oligomers and complementary DNA oligonucleotides was significantly lower than that of the corresponding complexes involving unmodified PNA. However, the sequence selectivity was retained. Thymidyl decamers with all N-(2-aminoethyl)-beta-alanine or N-(3-aminopropyl)glycine backbones were prepared and shown to be unable to hybridize to the complementary (dA)(10) oligonucleotides, whereas a PNA decamer containing only ethylenecarbonyl linkers between the nucleobases and the N-(2-aminoethyl)glycine backbone showed weak but sequence-specific affinity for complementary DNA. All hybrids involving homopyrimidine PNA oligomers exhibited (PNA)(2)/DNA stoichiometry, whereas mixed-sequence PNA oligomers formed PNA/DNA duplexes. The preferred binding direction between the modified PNA and DNA in the duplex motifs was antiparallel, as previously reported for complexes involving unmodified PNA.
Modification of the binding affinity of peptide nucleic acids (PNA). PNA with extended backbones consisting of 2-aminoethyl-β-alanine or 3-aminopropylglycine units
作者:Birgitte Hyrup、Michael Egholm、Marc Rolland、Peter E. Nielsen、Rolf H. Berg、Ole Buchardt
DOI:10.1039/c39930000518
日期:——
The binding affinity between peptidenucleicacids (PNA) and DNA is reduced by incorporation of PNA units with extended backbones.