corresponding to 1 was not detected clearly by HPLC analysis of a nucleoside mixture obtained by complete hydrolysis of I-1. Therefore, the oligonucleotide I-1 was treated with cyanomethylene-triphenylphosphorane to give an oligonucleotide containing (E) and (Z)-5-(2-cyanovinyl)-2'- deoxyuridine, which was then hydrolyzed, and the newly generated nucleosides were detected by HPLC analysis. The Tm of
将胸苷转化为5-甲酰基-2'-脱氧尿苷(1),将其掺入寡核苷酸5'd(GGAGA1CTCC)3'(I-1)和5'd(GCTGC1GCGAAAGCTG)3'(II-1)。为避免副反应和降解,必须使用新开发的保护基N,N-二-(3,5-二氯苯基)乙二胺保护1的甲酰基。在用于寡核苷酸的酶完全消化的条件下,化合物1是不稳定的,因此通过HPLC分析通过I-1的完全水解获得的核苷混合物,没有清楚地检测到对应于1的峰。因此,将寡核苷酸I-1用氰基亚甲基三苯基膦处理,得到含有(E)和(Z)-5-(2-氰基乙烯基)-2'-脱氧尿苷的寡核苷酸,然后将其水解,并通过HPLC分析检测新产生的核苷。在包含0.01 M磷酸钠(pH 7.0)的缓冲液中,自我互补寡核苷酸I-1(40°C)的Tm高于亲本寡核苷酸5'd(GGAGATCTCC)3'(31°C)的Tm。 )和0.1 M NaCl。在模板引物系统[引物,5'd(
Synthetic Access to the Chemical Diversity of DNA and RNA 5′-Aldehyde Lesions
作者:Rémy Lartia、Jean-François Constant
DOI:10.1021/jo502170e
日期:2015.1.16
C5′-position of nucleotides in DNA results in direct strand scission by generating alkali-labile fragments from the oxidized nucleotide. The majordamage consists in a terminus containing a 5′-aldehyde as part of an otherwise undamaged nucleotide. Moreover it is considered as a polymorphic DNA strand break lesion since it can be borne by any of the four nucleosides encountered in DNA. Here we propose an expeditious