Azide−Alkyne “Click” Conjugation of 8-Aza-7-deazaadenine-DNA: Synthesis, Duplex Stability, and Fluorogenic Dye Labeling
作者:Frank Seela、Suresh S. Pujari
DOI:10.1021/bc100090y
日期:2010.9.15
phosphoramidite, and oligonucleotides were synthesized. To evaluate the influence of ligands on the oligonucleotide duplex stability, benzyl azide 4 (nonpolar), and 2′,3′-dideoxy azidothymidine 5 (AZT) (polar) were introduced along with the fluorogenic dyes 2 and 3. DNA duplexes with octa-1,7-diynyl side chains (i.e., containing 1) are more stable than oligonucleotides containing 8-aza-7-deaza-2′-deoxyadenosine
描述了通过Huisgen-Meldal-Sharpless“点击”反应对DNA进行的内部染料标记。荧光9-叠氮基甲基蒽2和3-叠氮基-7-羟基香豆素3被用于寡核苷酸的后合成功能化结合八-(1,7)-二炔基-8-氮杂-7-脱氮基2'-脱氧腺苷1。通过Sonogashira交叉偶联从相应的7-碘化合物制备核苷1,将其转化为相应的亚磷酰胺,并合成寡核苷酸。要评估配体对寡核苷酸双链体稳定性的影响,请使用叠氮化苄4(非极性)和2',3'-二脱氧叠氮胸苷5(AZT)(极性)与荧光染料2和3一起引入。具有八-1,7-二炔基侧链(即含有1)的DNA双链体比含有8-aza-7-deaza-2'-脱氧腺苷的寡核苷酸更稳定,这表明该侧链具有空间自由度。蒽残基的单个缀合导致双链体熔化的T m增加9°C 。与7-deazaadenine染料缀合物相反,8-aza-7-deazaadenine缀合物几乎没有荧光猝灭,