Putrescinylthymidine was prepared by the reduction of the Schiff base formed from a 2'-deoxy-5-formyluridine derivative and N-phthaloylputrescine, followed by deprotection. The following deoxyoligonucleotides containing putrescinylthymine (TP) were synthesized; dodecathymidylic acids containing two to four TP residues, self-complementary decanucleotides (AAGAATTCTT) and dodecanucleotides (AGATAGCTATCT) in which T residues were partly replaced by TP, and related oligomers. Oligonucleotides containing TP were resistant to nuclease S1 digestion and were poor substrates to venom phosphodiesterase. The thermal stability (Tm) of the duplex structure of oligomers containing TP was not enhanced in spite of the expected electrostatic binding between the putrescinyl and phosphoryl residues, and was rather sequence-dependent.
腐胺胸苷是通过从 2'-脱氧-5-甲酰
尿苷衍
生物和 N-邻苯二甲酰胺
腐胺形成的希夫碱的还原反应制备的,随后进行去保护处理。合成了以下含有
腐胺胸苷(TP)的脱氧寡核苷酸;含有两个到四个 TP 殘基的十二聚
胸苷酸、自互补的十聚核苷酸(
AAG
AATTCTT)和十二聚核苷酸(AGATAGCTATCT),其中 T 残基部分被 TP 替代,以及相关的寡聚物。含有 TP 的寡核苷酸对
核酸酶 S1 消化具抵抗性,并且是毒液
磷酸二酯酶的劣质底物。尽管预计
腐胺和
磷酸残基之间存在静电结合,含有 TP 的寡聚物双链结构的热稳定性(Tm)并没有增强,而是相当依赖序列。