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Distribution of rRNA Introns in the Three-dimensional Structure of the Ribosome.

机译:rRNA内含子在核糖体三维结构中的分布。

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More than 1200 introns have been documented at over 150 unique sites in the small and large subunit ribosomal RNA genes (as of February 2002). Nearly all of these introns are assigned to one of four main types: group I, group II, archaeal and spliceosomal. This sequence information has been organized into a relational database that is accessible through the Comparative RNA Web Site (http://www.rna.icmb.utexas.edu/) While the rRNA introns are distributed across the entire tree of life, the majority of introns occur within a few phylogenetic groups. We analyzed the distributions of rRNA introns within the three-dimensional structures of the 30S and 50S ribosomes. Most sites in rRNA genes that contain introns contain only one type of intron. While the intron insertion sites occur at many different coordinates, the majority are clustered near conserved residues that form tRNA binding sites and the subunit interface. Contrary to our expectations, many of these positions are not accessible to solvent in the mature ribosome. The correlation between the frequency of intron insertions and proximity of the insertion site to functionally important residues suggests an association between intron evolution and rRNA function.
机译:在大小亚基核糖体RNA基因的150个以上的独特位点上已记录了1200多个内含子(截至2002年2月)。几乎所有这些内含子都被分配为四种主要类型之一:第一类,第二类,古细菌和剪接体。该序列信息已组织成一个关系数据库,可通过比较RNA网站(http://www.rna.icmb.utexas.edu/)进行访问。尽管rRNA内含子分布在整个生命树中,但大多数内含子的数目出现在几个系统发生群中。我们分析了30S和50S核糖体的三维结构中rRNA内含子的分布。 rRNA基因中含有内含子的大多数位点仅包含一种内含子。内含子插入位点出现在许多不同的坐标上,但大多数聚集在保守的残基附近,形成tRNA结合位点和亚基界面。与我们的预期相反,在成熟核糖体中,溶剂无法接近这些位置中的许多位置。内含子插入频率和插入位点与功能上重要的残基的接近程度之间的相关性暗示内含子进化与rRNA功能之间存在关联。

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