The life of U6 small nuclear RNA, from cradle to grave.

The life of U6 small nuclear RNA, from cradle to grave.
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DOI:
10.1261/rna.065136.117
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发表时间:
2018-04
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Brow DA
Brow DA
中科院分区:
其他
文献类型:
--
作者:
Didychuk AL;Butcher SE;Brow DA

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从前体信使RNA(pre-mRNA)和一些非编码转录物中去除内含子是真核基因表达的重要步骤。在细胞核中,RNA剪接的过程是由剪接体进行的,剪接体是一种多兆道尔顿的大分子机器,其核心成分从酵母到人类都是保守的。除了许多蛋白质外,剪接体还含有五种富含尿苷的小核RNA(snRNA),它们经历了一系列精心设计的构象变化,以正确识别剪接位点并催化内含子去除。几十年的生物化学和遗传学数据,沿着最近的冷冻电镜结构,明确表明U6 snRNA形成剪接体的大部分催化核心,并且是高度动态的,在整个剪接循环中与三种snRNA、前mRNA底物和>25种蛋白质伴侣相互作用。本文综述了U6 snRNA如何合成、修饰、整合到snRNP和剪接体中、回收和降解的知识现状。
Removal of introns from precursor messenger RNA (pre-mRNA) and some noncoding transcripts is an essential step in eukaryotic gene expression. In the nucleus, this process of RNA splicing is carried out by the spliceosome, a multi-megaDalton macromolecular machine whose core components are conserved from yeast to humans. In addition to many proteins, the spliceosome contains five uridine-rich small nuclear RNAs (snRNAs) that undergo an elaborate series of conformational changes to correctly recognize the splice sites and catalyze intron removal. Decades of biochemical and genetic data, along with recent cryo-EM structures, unequivocally demonstrate that U6 snRNA forms much of the catalytic core of the spliceosome and is highly dynamic, interacting with three snRNAs, the pre-mRNA substrate, and >25 protein partners throughout the splicing cycle. This review summarizes the current state of knowledge on how U6 snRNA is synthesized, modified, incorporated into snRNPs and spliceosomes, recycled, and degraded.
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