Diarylethenes were attached to the 5-position of 2’-deoxyuridine in order to yield three different photochromic nucleosides. All nucleosides were characterized with respect to their absorption and photochromic properties. Based on these results, the most promising photochromic DNA base modification was incorporated into representative oligonucleotides by using automated phosphoramidite chemistry. The switching of optical properties in DNA can be achieved selectively at 310 nm (forward) and 450 nm (backward); both wavelengths are outside the normal nucleic acid absorption range. Moreover, this nucleoside was proven to be photochemically stable and allows switching back and forth several times. These results open the way for the use of diarylethenes as photochromic compounds in DNA-based architectures.
日落花
烯被连接到
2'-去氧尿苷的5位上,以产生三种不同的光致变色核苷。所有核苷都通过吸收和光致特性进行了表征。基于这些结果,最有前途的光致DNA碱基修饰被应用于代表性寡
核苷酸中,使用自动化
磷酰胺酰
化学方法进行合成。在DNA中,光学性质的切换可以在310 nm(向前)和450 nm(向后)选择性地实现,两种波长都在正常的
核酸吸收范围之外。此外,证明该核苷具有光
化学稳定性,并允许多次来回切换。这些结果为利用日落花
烯作为DNA
基础结构中的光致化合物开辟了道路。