DNA duplexes stabilized by modified monomer residues: synthesis and stability
作者:Duncan Graham、John A. Parkinson、Tom Brown
DOI:10.1039/a707031d
日期:——
The synthesis of a series of 2′-deoxyuridine analogues modified at the 5-position and a series of 2′-deoxypurines modified at the 8-position is described. Ultraviolet melting studies have been used to assess the stability of DNA duplexes 12- and 8-residues in length that contain these modifications. Of those modified residues which have been incorporated into oligonucleotides, 5-(prop-1-ynyl)-2′-deoxyuridine is found to impart the greatest increase in stability on the DNA duplexes studied.Thermodynamic analyses show that the reason for this increase in stability arises from a decrease in enthalpy which is related to the DNA base stacking process. We suggest that the degree of stabilisation imparted by the propyne moiety may be sequence dependent.
本文描述了一系列在 5 位修饰的 2′-脱氧尿苷类似物和一系列在 8 位修饰的 2′-脱氧尿苷的合成过程。紫外线熔解研究被用来评估含有这些修饰的 12 位和 8 位 DNA 双链的稳定性。热力学分析表明,稳定性增加的原因是与 DNA 碱基堆叠过程有关的焓的降低。我们认为丙炔分子的稳定程度可能与序列有关。