核内核溶解RNA被一个真核生物外生体分裂
Alice Lebreton1, Rafal Tomecki, Andrzej Dziembowski
1Equipe Labellisée La Ligue, Centre de Génétique Moléculaire, CNRS UPR 2167, 91198 Gif-sur-Yvette, France.
Nature
|December 9, 2008
概括
细胞外体,一个关键的RNA处理机器,既具有内核和外核活动. 这些由Dis3亚单元介导的双重功能对于细胞RNA调节和生存至关重要.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 遗传学 是一个遗传学.
背景情况:
- 外体是关键的真核核酶,参与RNA处理,质量控制和循环.
- 它作为一个具有9个子单元环结构的3'到5'外核酶起作用.
- 之前的研究表明,在真核生物中存在不活跃的环状结构,其活性仅归因于Dis3的RNB域.
研究的目的:
- 为了研究真核外体细胞核的催化活动.
- 为了确定Dis3子单元的PIN域在外体组功能中的作用.
- 阐明内核和外核分解活性在RNA代谢中的联合贡献.
主要方法:
- 在体外测试以评估酶活性.
- 对酵母菌株具有无活化外体细胞核心域的分析.
- 在特定的遗传条件下对酵母生长的表型分析.
主要成果:
- 酵母Dis3表现出内核酶 (PIN域) 和外核酶 (RNB域) 活动.
- 这两种活动的同时不活化会导致体内合成生长缺陷.
- PIN域的内核分解活性有助于自然外体基质的分裂,而不依赖于外核分解性降解.
结论:
- 细胞外体内核具有内核和外核分解性活动,通过Dis3子单元的不同域进行介导.
- 这些发现挑战了现有的外体细胞功能模型,突出了多个核糖核分解活动的合作.
- 对外体在RNA处理和降解中的作用进行重新考虑是有必要的,包括其双重催化能力.
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