Research Article

基于RNA(ADARs)同种型的腺苷脱氨酶对基因治疗遗传密码校正的比较活性

卷 19, 期 1, 2019

页: [31 - 39] 页: 9

弟呕挨: 10.2174/1566523218666181114122116

价格: $65

摘要

简介:作用于RNA(ADAR)酶家族的腺苷脱氨酶成员由双链RNA结合结构域(dsRBD)和将腺苷(A)转化为肌苷(I)的脱氨酶结构域(DD)组成,其作用如下: guanosine(G)在翻译期间。使用MS2系统,我们设计了ADAR1的DD,以将其定向到特定目标。这项工作的目的是比较ADAR1-DD的脱氨酶活性和ADAR2-DD的各种同种型。 材料和方法:我们测量了人工酶系统对Biacore™X100的结合亲和力。 ADAR通常靶向dsRNA,因此我们设计了与靶RNA互补的指导RNA,然后将指导序列融合到MS2茎环中。靶向EGFP的58个氨基酸(TGG)的突变的琥珀(TAG)终止密码子。在将这三种因子转染到HEK 293细胞中后,我们观察到各种强度的荧光信号。 结果:没有Alu盒的ADAR2-long产生的荧光信号比Alu-box的ADAR2长得多。使用另一种同种型,ADAR2-short,其在C-末端短81bp,荧光信号是不可检测的。 ADAR2-long-DD(E488Q)的单个氨基酸取代使得酶比野生型更具活性。荧光显微镜检查结果表明,ADAR1-DD比ADAR2-long-DD更活跃。 Western印迹和测序证实ADAR1-DD比任何其他DD更活跃。 结论:本研究提供的信息应有助于合理使用ADAR变异体进行遗传病的遗传修复和治疗。

关键词: 定点RNA编辑,基因治疗,ADAR-DD,dsRBD,TAG,MS2 RNA。

图形摘要
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