Improved Synthesis and Mutagenicity of Oligonucleotides Containing 5-Hydroxymethylcytosine, 5-Formylcytosine and 5-Carboxylcytosine
作者:Martin Münzel、Ulrike Lischke、Dimitrios Stathis、Toni Pfaffeneder、Felix A. Gnerlich、Christian A. Deiml、Sandra C. Koch、Konstantin Karaghiosoff、Thomas Carell
DOI:10.1002/chem.201102782
日期:2011.12.2
5‐Formylcytosine (fC or 5‐CHOdC) and 5‐carboxylcytosine (caC or 5‐COOHdC) have recently been identified as constituents of mammalian DNA. The nucleosides are formed from 5‐methylcytosine (mC or 5‐MedC) via 5‐hydroxymethylcytosine (hmC or 5‐HOMedC) and are possible intermediates of an active DNA demethylation process. Here we show efficient syntheses of phosphoramidites which enable the synthesis of
最近已鉴定出5-甲酰基胞嘧啶(fC或5-CHO dC)和5-羧基胞嘧啶(caC或5-COOH dC)是哺乳动物DNA的成分。核苷由5-甲基胞嘧啶(mC或5-Me dC)经由5-羟甲基胞嘧啶(hmC或5-HOMe dC)形成,并且可能是活性DNA去甲基化过程的中间体。在这里,我们显示了亚磷酰胺的有效合成方法,该方法能够合成包含这些基于Pd 0的胞嘧啶修饰的DNA链5-碘代脱氧胞苷的催化功能化。fC的第一个晶体结构表明,在环外胺和甲酰基之间存在分子内H键,该键控制甲酰基取代基的构象。使用新设计的体外诱变试验,我们显示fC和caC只是轻微诱变,这是碱基充当表观遗传控制单位的前提。