ASC1 and RPS3: new actors in 18S nonfunctional rRNA decay.

ASC1 and RPS3: new actors in 18S nonfunctional rRNA decay.
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DOI:
10.1261/rna.061671.117
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发表时间:
2017-12
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Moore MJ
Moore MJ
中科院分区:
其他
文献类型:
--
作者:
Limoncelli KA;Merrikh CN;Moore MJ

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在萌芽酵母中,40S核糖体亚单位解码中心的失活突变导致18S rRNA被称为无功能的18S rRNA衰变(18S NRD)的质量控制机制清除。我们先前已经证明18S NRD在功能上与No-go mRNA Decay(NGD)有关,NGD是一种清除停滞在异常mRNAs上的翻译复合体的途径。虽然NGD因子Dom34p和Hbs1p对18S NRD有贡献,但它们的基因缺失(单独或联合)只能部分稳定突变的18S rRNA。在这里,我们确定Asc1p(又名RACK1)和Rps3p,这两个稳定的40S亚基成分,是额外的18S NRD因子。突变的18S rRNA在Dom34Δ、Asc1Δ和Hbs1Δ;Asc1Δ株中完全稳定,表明存在两条遗传上可分离的18S NRD途径。已知的Rps3p C末端尾部的一个小区域受到翻译后修饰的影响,这对18S NRD也是至关重要的。我们将这些发现与5‘→3’和3‘→5’衰变机制的突变效应结合起来,提出了一个模型,其中多个靶向和衰变途径在18S NRD中起到了动力学作用。
In budding yeast, inactivating mutations within the 40S ribosomal subunit decoding center lead to 18S rRNA clearance by a quality control mechanism known as nonfunctional 18S rRNA decay (18S NRD). We previously showed that 18S NRD is functionally related to No-Go mRNA Decay (NGD), a pathway for clearing translation complexes stalled on aberrant mRNAs. Whereas the NGD factors Dom34p and Hbs1p contribute to 18S NRD, their genetic deletion (either singly or in combination) only partially stabilizes mutant 18S rRNA. Here we identify Asc1p (aka RACK1) and Rps3p, both stable 40S subunit components, as additional 18S NRD factors. Complete stabilization of mutant 18S rRNA in dom34Δ;asc1Δ and hbs1Δ;asc1Δ strains indicates the existence of two genetically separable 18S NRD pathways. A small region of the Rps3p C-terminal tail known to be subject to post-translational modification is also crucial for 18S NRD. We combine these findings with the effects of mutations in the 5′ → 3′ and 3′ → 5′ decay machinery to propose a model wherein multiple targeting and decay pathways kinetically contribute to 18S NRD.
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