pH dependence of C•A, G•A and A•A mismatches in the stem of precursor microRNA-31.

pH dependence of C•A, G•A and A•A mismatches in the stem of precursor microRNA-31.
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DOI:
10.1016/j.bpc.2022.106763
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发表时间:
2022-04
影响因子:
3.8
通讯作者:
Keane, Sarah C.
Keane, Sarah C.
中科院分区:
生物学4区
文献类型:
--
作者:
Kotar, Anita;Ma, Sicong;Keane, Sarah C.

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MicroRNAs(MiRNAs)是转录后基因表达的重要调节因子。成熟的miRNAs是由较长的转录本(初级、初级和前体,前miRNAs)通过一系列高度协调的酶处理步骤产生的。这些Pri-和Pre-miRNAs的序列和结构在控制其加工过程中发挥着重要作用。Pri-和Pre-miRNAs都采用发夹结构,螺旋茎中的碱基配对不完美。在这里,我们研究了前miRNA-31中存在的三个碱基对错配(A∙A、G∙A和C∙A)的作用。结合核磁共振波谱和热变性,我们发现三个碱基对错配中的核苷酸表现出独特的结构特性,包括不同的动力学和对溶液pH的敏感性。这些研究加深了我们对碱基对错配的物理和化学性质如何影响RNA结构稳定性的理解。
MicroRNAs (miRNAs) are important regulators of post-transcriptional gene expression. Mature miRNAs are generated from longer transcripts (primary, pri- and precursor, pre-miRNAs) through a series of highly coordinated enzymatic processing steps. The sequence and structure of these pri- and pre-miRNAs play important roles in controlling their processing. Both pri- and pre-miRNAs adopt hairpin structures with imperfect base pairing in the helical stem. Here, we investigated the role of three base pair mismatches (A∙A, G∙A, and C∙A) present in pre-miRNA-31. Using a combination of NMR spectroscopy and thermal denaturation, we found that nucleotides within the three base pair mismatches displayed unique structural properties, including varying dynamics and sensitivity to solution pH. These studies deepen our understanding of how the physical and chemical properties of base pair mismatches influence RNA structural stability.
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