The spermine conjugate of the cationic porphyrin ligand (1) selectively induced the BâZ transition of the [(dA-T)n]2 sequence at low salt concentrations. The [(dG-C)n]2 sequence was not transformed into the Z-form. The BâZ transition was induced via an intermediate DNA conformation, which was formed by the external binding and formation of an assembly of 1 onto B-DNA.
阳离子
卟啉配体 (1) 的
精胺缀合物在低盐浓度下选择性诱导 [(dA-T)n]2 序列的 B→Z 转变。 [(dG-C)n]2 序列未转化为 Z 型。 B→Z 转变是通过中间 DNA 构象诱导的,该构象是通过 1 与 B-DNA 的外部结合和组装形成的。