In the 15-mer catalytic core of 10-23 DNAzyme, each residue contributes to the catalytic conformation differently. Here, the critically conserved T4 and the least conserved T8 were modified on their 5-position with hydroxyl, imidazolyl, and amino groups with a hydrogen-bonding ability. These external functional groups induced new interactions within the catalytic core, resulting in both negative and positive effects on the catalytic activity of 10-23 DNAzyme, and the different linkages could be used to modulate the effect of the functional groups. The conservation of T4 and T8 could be recognized at the level of the nucleobase, but at the level of the functional group, T4 is not completely conserved. Their 5-methyl groups could be modified for a better performance in terms of the DNAzyme.
在 10-23 DNA 酶的 15 个聚合物催化核心中,每个残基对催化构象的贡献各不相同。在这里,非常保守的 T4 和最不保守的 T8 在其 5 位上被修饰为具有氢键能力的羟基、
咪唑基和
氨基。这些外部功能基团在催化核心内诱导了新的相互作用,从而对 10-23 DNA 酶的催化活性产生了消极和积极的影响,不同的连接方式可用于调节功能基团的作用。在核碱基
水平上,T4 和 T8 的保守性可以得到认可,但在官能团
水平上,T4 并不完全保守。可以对它们的 5-甲基基团进行修饰,以提高 DNA 酶的性能。