Substrate Analogues for an RNA-Editing Adenosine Deaminase: Mechanistic Investigation and Inhibitor Design
作者:Eduardo A. Véliz、LaHoma M. Easterwood、Peter A. Beal
DOI:10.1021/ja029742d
日期:2003.9.1
ADARs are adenosinedeaminases that act on RNA and are responsible for RNA-editing reactions that occur in eukaryotic mRNAs, including the mRNAs of glutamate and serotonin receptors. ADARs capable of editing biologically relevant RNA substrates have been identified. In addition, the consequence of the RNA-editing reaction on the function of the gene product is known in several cases. However, our understanding
A Transition State Analogue for an RNA-Editing Reaction
作者:Brittany L. Haudenschild、Olena Maydanovych、Eduardo A. Véliz、Mark R. Macbeth、Brenda L. Bass、Peter A. Beal
DOI:10.1021/ja0472073
日期:2004.9.1
adenosine in RNA catalyzed by the ADAR enzymes generates inosine at the corresponding position. Because inosine is decoded as guanosine during translation, this modification can lead to codon changes in messenger RNA. Hydration of 8-azanebularine across the C6-N1 double bond generates an excellent mimic of the transition state proposed for the hydrolytic deamination reaction catalyzed by ADARs. Here
由 ADAR 酶催化的 RNA 中 C6 腺苷的脱氨基作用在相应位置产生肌苷。由于肌苷在翻译过程中被解码为鸟苷,因此这种修饰会导致信使 RNA 中的密码子发生变化。8-氮杂碳氢化合物通过 C6-N1 双键的水合产生了对 ADAR 催化的水解脱氨基反应提出的过渡态的极好模拟。在这里,我们报告了 8-氮芥亚磷酰胺的合成及其在制备 RNA 中的用途,该 RNA 模仿在谷氨酸受体 B 亚基 pre-mRNA 中的已知编辑位点发现的二级结构。含有类似物的 RNA 的结合特性表明 ADAR 的紧密结合配体可以通过掺入 8-azanebularine 产生。观察到的高亲和力结合取决于功能活性位点、ADAR2 的两个双链 RNA 结合基序 (dsRBMs) 中一个而不是另一个的存在,以及核苷类似物在序列中的正确位置/已知编辑站点的结构上下文。这些结果促进了我们对 ADAR 催化的 RNA 编辑过程中底物识别的理解,并且对于