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The 5 ' Binding MID Domain of Human Argonaute2 Tolerates Chemically Modified Nucleotide Analogues

机译:人体Argonaute2的5'结合中域耐受化学修饰的核苷酸类似物

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Small interfering RNAs (siRNAs) can trigger potent gene silencing through the RNA interference (RNAi) pathway. The RNA-induced silencing complex (RISC) is key to this targeted mRNA degradation, and the human Argonaute2 (hAGO2) endonuclease component of RISC is responsible for the actual mRNA cleavage event. During RNAi, hAGO2 becomes loaded with the siRNA guide strand, making several key nucleic acid-enzyme interactions. Chemically modified siRNAs are now widely used in place of natural double-stranded RNAs, and understanding the effects chemical modifications have on guide strand-hAGO2 interactions has become particularly important. Here, interactions between the 5' nucleotide binding domain of hAGO2, MID, and chemically modified nucleotide analogues are investigated. Measured dissociation constants reveal that hAGO2 does not discriminate between nucleotide analogues during binding, regardless of the preferred sugar conformation of the nucleotide analogues. These results correlate well with cell-based gene silencing results employing siRNAs with 5'-modified guide strands. Additionally, chemical modification with 2'-deoxy-2'-fluoroarabino nucleic acid (2'F-ANA) and 2'-deoxy-2'-fluororibonucleic acid (2'F-RNA) at the passenger strand cleavage site of siRNAs has been shown to prevent hAGO2-mediated strand cleavage, an observation that appears to have little impact on overall gene silencing potency.
机译:小干扰RNA(siRNA)可以通过RNA干扰(RNAi)途径触发有效的基因沉默。 RNA诱导的沉默复合物(RISC)是该靶向mRNA降解的关键,HANGONSUTE2(HAGO2)内切核酸酶组分的RISC负责实际mRNA切割事件。在RNAi期间,Hago2与siRNA引导股一起加载,使得几个关键的核酸 - 酶相互作用。现在被广泛使用化学改性的siRNA代替天然双链RNA,并且了解化学修饰对导向链 - Hago2相互作用的影响变得尤为重要。这里,研究了Hago2,中等和化学修饰的核苷酸类似物的5'核苷酸结合结构域之间的相互作用。测量的解离常数表明,无论核苷酸类似物的优选糖构象如何,Hago2在结合期间不区分核苷酸类似物。这些结果与采用具有5'-改性的导向股的细胞的基因沉默结果相关。另外,用2'-脱氧-2'-氟咔啉核酸(2'F-ANA)和2'-脱氧-2'-氟核酸(2'F-RNA)的化学改性在SIRNA的乘客链裂解位点具有已被证明预防HAGO2介导的链裂解,观察结果似乎对整体基因沉默效力几乎没有影响。

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