Oligonucleotide Analogs with Peptide Internucleotide Linkages
摘要:
Oligonucleotide analogs containing one or a few glycine, L-, and D-alanine or L-and D-phenylalanine residues instead of phosphodiesterinternucleotide linkages were synthesized. The stability of the duplexes formed by modified oligonucleotides and their wildtype complements was studied. Oligonucleotides with D-alanine residues in internucleotide linkages form duplexes more stable than native ones (Tm +0.2 degrees C per modification), whereas other modifications destabilize the duplexes.
Oligonucleotides containing a peptide internucleotide linkage. A novel class of modified oligonucleotides
摘要:
Oligonucleotide analogues containing one or a few glycine, L-, and D-alanine residues instead of phosphodiester internucleotide linkages were synthesized (C3'-NH-C(O)-CH(X)-NH-C(O)-C4', where X = H, (S)-CH3, and (R)-CH3. The stability of the duplexes of modified oligonucleotides with their wild-type complements was studied. The incorporation of glycine and L-alanine residues into internucleotide linkages was shown to noticeably decrease the stability of modified duplexes as compared to that of native ones (Delta T (m similar to)a'2A degrees C per modification), whereas analogues containing D-alanine linkers form duplexes with increased stability (Delta T (m similar to)+2A degrees C per modification).