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
中科院分区:
文献类型:
--
作者:
Jacob, Asha Ivy;Koehrer, Caroline;Davies, Bryan William;RajBhandary, Uttam Lal;Walker, Graham Charles
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.
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