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Complementary sets of noncanonical base pairs mediate RNA helix packing in the group intron active site

机译:非规范碱基对的互补组介导内含子活性位点中的RNA螺旋堆积

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摘要

Helix packing is critical for RNA tertiary structure formation, although the rules for helix-helix association within structured RNAs are largely unknown. Docking of the substrate helix into the active site of the Tetrahymena group I ribozyme provides a model system to study this question, Using a novel chemogenetic method to analyze RNA structure in atomic detail, we report that complementary sets of noncanonical base pairs (a G.U wobble pair and two consecutively stacked sheared A.A pairs) create an RNA helix packing motif that is essential for 5'-splice site selection in the group I intron. This is likely to be a general motif for helix-helix interaction within the tertiary structures of many large RNAs. [References: 42]
机译:螺旋堆积对于RNA三级结构的形成至关重要,尽管在结构RNA中螺旋-螺旋缔合的规则尚不清楚。将底物螺旋对接至四膜虫群I核酶的活性位点,提供了一个研究此问题的模型系统。使用一种新颖的化学生成方法来分析原子结构中的RNA结构,我们报道了非规范碱基对的互补集(GU摆动对和两个连续堆叠的剪切的AA对)可形成RNA螺旋堆积基序,这对于I组内含子中5'剪接位点的选择至关重要。这很可能是许多大RNA三级结构中螺旋-螺旋相互作用的通用基序。 [参考:42]

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