Rigid, Conjugated, Fluoresceinated Thymidine Triphosphates: Syntheses and Polymerase Mediated Incorporation into DNA Analogues
作者:Lars H. Thoresen、Guan-Sheng Jiao、Wade C. Haaland、Michael L. Metzker、Kevin Burgess
DOI:10.1002/chem.200304944
日期:2003.10.6
increases with length, so does the intensity of the fluorescein emission. A gel assay was used to gauge relative incorporation efficiencies of compounds 1-3, dTTP, ddTTP, and 6-TAMRA-ddTTP. Throughout, the thermostable polymerase TaqFS was used, as it is the one most widely applied in high throughput DNA sequencing. This assay showed that only compounds 3 were incorporated efficiently; these have the longest
描述了一组独特的能量转移染料标记的三磷酸核苷化合物1-3的合成。只有在将染料偶联至核碱基之前进行了三磷酸化反应,才能成功制备这些化合物,而反之则没有。将化合物制备为2'-脱氧(a)和2',3'-二脱氧-(b)形式。它们具有连接核碱基和羟吨蒽酮部分的逐渐更长的刚性共轭接头。亲本核苷12-14的UV光谱表明,随着接头长度的增加,供体在320-330nm区域的吸收也增加,但是最大值的红移相对较小。相同化合物的荧光光谱表明,在320-330 nm范围内的辐射导致荧光素的主要发射。当在320 nm处辐照连接子时,观察到的唯一显着发射峰对应于520 nm处分子的羟基黄酮部分;这对应于200 nm的有效斯托克斯位移。随着接头在320-330 nm处的吸收随长度增加,荧光素发射的强度也随之增加。凝胶测定法用于测定化合物1-3,dTTP,ddTTP和6-TAMRA-ddTTP的相对掺入效率。在整个过程中,使