Role of the ubiquitin-like protein Hub1 in splice-site usage and alternative splicing.

Role of the ubiquitin-like protein Hub1 in splice-site usage and alternative splicing.
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DOI:
10.1038/nature10143
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发表时间:
2011-05-25
期刊:
影响因子:
64.8
通讯作者:
Jentsch, Stefan
Jentsch, Stefan
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Mishra, Shravan Kumar;Ammon, Tim;Popowicz, Grzegorz M.;Krajewski, Marcin;Nagel, Roland J.;Ares, Manuel, Jr.;Holak, Tad A.;Jentsch, Stefan

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前信使 RNA 的选择性剪接使真核生物中的基因产物多样化,并受到使剪接体能够识别特定剪接位点的因素的指导。在这里,我们报道了保守的泛素样蛋白 Hub1 促进了酿酒酵母 SRC1 前 mRNA 的选择性剪接。结构和生化数据表明,Hub1 非共价结合到称为 HIND 的保守元件,该元件存在于酵母和哺乳动物的剪接体蛋白 Snu66 和植物中的 Prp38 中。 Hub1 结合轻微改变剪接体蛋白相互作用,几乎不影响酿酒酵母中的一般剪接。然而,缺乏 Hub1 或 Hub1-HIND 相互作用有缺陷的剪接体不能使用某些非规范的 5' 剪接位点,并且选择性 SRC1 剪接有缺陷。 Hub1 不仅在与 HIND 结合时提供选择性剪接,而且在实验上与 Snu66、Prp38 甚至核心剪接因子 Prp8 融合时也提供选择性剪接。我们的研究表明了一种剪接位点利用的新机制,该机制是通过非常规的类泛素修饰剂对剪接体进行非共价修饰来指导的。
Alternative splicing of pre-messenger RNAs diversifies gene products in eukaryotes and is guided by factors that enable spliceosomes to recognize particular splice sites. Here we report that alternative splicing of Saccharomyces cerevisiae SRC1 pre-mRNA is promoted by the conserved ubiquitin-like protein Hub1. Structural and biochemical data show that Hub1 binds non-covalently to a conserved element termed HIND, which is present in the spliceosomal protein Snu66 in yeast and mammals, and Prp38 in plants. Hub1 binding mildly alters spliceosomal protein interactions and barely affects general splicing in S. cerevisiae. However, spliceosomes that lack Hub1, or are defective in Hub1–HIND interaction, cannot use certain non-canonical 5′ splice sites and are defective in alternative SRC1 splicing. Hub1 confers alternative splicing not only when bound to HIND, but also when experimentally fused to Snu66, Prp38, or even the core splicing factor Prp8. Our study indicates a novel mechanism for splice site utilization that is guided by non-covalent modification of the spliceosome by an unconventional ubiquitin-like modifier.
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