Conserved bacterial RNase YbeY plays key roles in 70S ribosome quality control and 16S rRNA maturation.

Conserved bacterial RNase YbeY plays key roles in 70S ribosome quality control and 16S rRNA maturation.
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DOI:
10.1016/j.molcel.2012.11.025
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发表时间:
2013-02-07
期刊:
影响因子:
16
通讯作者:
Walker, Graham Charles
Walker, Graham Charles
中科院分区:
生物学1区
文献类型:
--
作者:
Jacob, Asha Ivy;Koehrer, Caroline;Davies, Bryan William;RajBhandary, Uttam Lal;Walker, Graham Charles

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核糖体的质量控制对细胞功能至关重要,因为蛋白质错误翻译会导致严重的生理后果。我们报告了细菌中核糖体质量控制系统的第一个证据,该系统在70S水平上运行以去除有缺陷的核糖体。YbeY,一种以前未鉴定的核糖核酸内切酶,和核酸外切酶RNase R通过30S核糖体亚基特异性介导的过程一起作用,降解有缺陷的70S核糖体,但不能降解适当成熟的70S核糖体或单个亚基。此外,在45°C下ΔybeY突变体中基本上没有完全成熟的16S rRNA,使得YbeY成为第一个涉及16S rRNA 3'末端的至关重要的加工的内切核糖核酸酶。这些在核糖体质量控制和成熟中的关键作用表明了为什么YbeY是最小细菌基因集的成员,并表明它可能是抗菌药物的潜在靶点。
Quality control of ribosomes is critical for cellular function since protein mistranslation leads to severe physiological consequences. We report the first evidence of a ribosome quality control system in bacteria that operates at the level of 70S to remove defective ribosomes. YbeY, a previously unidentified endoribonuclease, and the exonuclease RNase R act together by a process mediated specifically by the 30S ribosomal subunit, to degrade defective 70S ribosomes but not properly matured 70S ribosomes or individual subunits. Furthermore, there is essentially no fully matured 16S rRNA in a ΔybeY mutant at 45°C, making YbeY the first endoribonuclease to be implicated in the critically important processing of the 16S rRNA 3' terminus. These key roles in ribosome quality control and maturation indicate why YbeY is a member of the minimal bacterial gene set and suggest that it could be a potential target for antibacterial drugs.
RNR1,一种属于RNR超家族的3'-5'驱虫核酸酶,在拟南芥中催化3'叶绿体核糖体RNA成熟。
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