Dissecting the Differences between the α and β Anomers of the Oxidative DNA Lesion FaPydG
作者:Florian Büsch、J. Carsten Pieck、Matthias Ober、Johannes Gierlich、Gerald W. Hsu、Lorena S. Beese、Thomas Carell
DOI:10.1002/chem.200701373
日期:2008.2.27
The oxidative DNA lesion, FaPydG rapidly anomerizes to form a mixture of the alpha and beta anomer. To investigate the mutagenic potential of both forms, we prepared stabilized bioisosteric analogues of both configurational isomers and incorporated them into oligonucleotides. These were subsequently used for thermodynamic melting-point studies and for primer-extension experiments. While the beta compound
氧化性DNA损伤FaPydG迅速发生异构化,形成α和β异构体的混合物。为了研究两种形式的诱变潜力,我们制备了两种构型异构体的稳定的生物等位基因类似物,并将其掺入寡核苷酸中。这些随后被用于热力学熔点研究和引物延伸实验。尽管与早期数据一致,β化合物更喜欢使用胞苷作为配对伴侣,但α化合物不能与任何天然碱基形成稳定的碱基对。在使用高保真聚合酶Bst Pol I进行引物延伸研究中,该聚合酶能够读取病灶。β化合物没有显示出很强的诱变潜力。相比之下,α化合物会严重破坏DNA双链体的稳定性,并会阻断所有测试的DNA聚合酶,