Chemical Incorporation of Chain-Terminating Nucleoside Analogs as 3′-Blocking DNA Damage and Their Removal by Human ERCC1-XPF Endonuclease
作者:Junpei Yamamoto、Chiaki Takahata、Isao Kuraoka、Kouji Hirota、Shigenori Iwai
DOI:10.3390/molecules21060766
日期:——
Nucleoside/nucleotide analogs that lack the 3′-hydroxy group are widely utilized for HIV therapy. These chain-terminating nucleoside analogs (CTNAs) block DNA synthesis after their incorporation into growing DNA, leading to the antiviral effects. However, they are also considered to be DNA damaging agents, and tyrosyl-DNA phosphodiesterase 1, a DNA repair enzyme, is reportedly able to remove such CTNA-modifications
缺乏 3'-羟基的核苷/核苷酸类似物被广泛用于 HIV 治疗。这些链终止核苷类似物 (CTNA) 在掺入生长的 DNA 后会阻止 DNA 合成,从而产生抗病毒作用。然而,它们也被认为是 DNA 损伤剂,据报道,酪氨酰 DNA 磷酸二酯酶 1(一种 DNA 修复酶)能够去除 DNA 的此类 CTNA 修饰。在这里,我们合成了代表性 CTNA 的亚磷酰胺构件,例如阿昔洛韦、阿巴卡韦、卡波韦和拉米夫定,并且在固体支持物上成功合成了具有 3'-CTNA 的寡核苷酸。使用化学合成的寡核苷酸,我们研究了人类切除修复交叉互补蛋白 1-色素干皮病 F 组(ERCC1-XPF)核酸内切酶对 DNA 中 3'-CTNA 的切除,该酶是核苷酸切除修复途径的主要成分之一。生化分析表明 ERCC1-XPF 核酸内切酶在 3'-阻断 CTNAs 上游 2-7 nt 处切割,并且在去除 CTNAs 后重新开始 Klenow