Incorporation of N,N-bis(2-pyridylmethyl)-β-alanyl 2â²-amino-LNA (bipyridyl-functionalized 2â²-amino locked nucleic acid) monomers into DNA strands enables high-affinity targeting of complementary DNA with excellent WatsonâCrick selectivity in the presence of divalent metal ions. Positioning of bipyridyl-functionalized 2â²-amino-LNA monomers in two complementary DNA strands in a â3â²-end zipperâ constitution allows modulation of duplex stability, i.e., a strong stabilizing effect with one equivalent of divalent metal ion per bipyridyl pair, or a strong destabilizing effect with an excess of divalent metal ions.
将N,N-双(2-
吡啶基甲基)-δ-丙
氨酰2â²-
氨基-LNA(双
吡啶基官能化2â²-
氨基锁定核酸)单体掺入DNA链中,可实现互补DNA的高亲和性靶向,在二价
金属离子存在下具有出色的WatsonâCrick选择性。将双
吡啶基官能化的 2â²-
氨基-LNA单体以 "3â²-末端拉链 "的结构置于两条互补DNA链中,可以调节双链的稳定性,即每对双
吡啶基含有一个等量的二价
金属离子时,会产生强烈的稳定作用;而二价
金属离子过量时,则会产生强烈的失稳作用。