A co-transcriptional ribosome assembly checkpoint controls nascent large ribosomal subunit maturation.

A co-transcriptional ribosome assembly checkpoint controls nascent large ribosomal subunit maturation.
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共转录核糖体组装检查点控制着新生的大核糖体亚基成熟。

DOI:
10.1038/s41594-023-00947-3
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发表时间:
2023-05
影响因子:
16.8
通讯作者:
Klinge, Sebastian
Klinge, Sebastian
中科院分区:
生物学1区
文献类型:
--
作者:
Sanghai, Zahra A.;Piwowarczyk, Rafal;Broeck, Arnaud Vanden;Klinge, Sebastian

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在核仁中真核核糖体DNA转录过程中,存在组装检查点,保证形成稳定的大小核糖体亚基前体。虽然早期大亚基组装检查点的形成早于大亚基成熟和小亚基成熟的分离,但其作用机制和功能尚不清楚。在这里,我们报告了作为检查点的酵母共转录大核糖体亚单位组装中间体的冷冻电子显微镜结构。这种结构为如何通过共转录的核糖体组装因子建立质量控制途径提供了机制基础,这些核糖体组装因子在结构上询问、重塑并与核糖体蛋白一起,协同稳定正确折叠的核糖体前RNA。因此,我们的发现为真核核糖体在核仁中组装过程中的质量控制提供了一个分子解释。在这里,使用冷冻-EM,作者详细说明了酵母对大的核糖体亚单位的共转录组装如何涉及到质量控制检查点。核糖体组装因子通过探测核糖体RNA的形成和确保正确折叠的核糖体RNA的合作稳定来实现这一检查点。
During transcription of eukaryotic ribosomal DNA in the nucleolus, assembly checkpoints exist that guarantee the formation of stable precursors of small and large ribosomal subunits. While the formation of an early large subunit assembly checkpoint precedes the separation of small and large subunit maturation, its mechanism of action and function remain unknown. Here, we report the cryo-electron microscopy structure of the yeast co-transcriptional large ribosomal subunit assembly intermediate that serves as a checkpoint. The structure provides the mechanistic basis for how quality-control pathways are established through co-transcriptional ribosome assembly factors, that structurally interrogate, remodel and, together with ribosomal proteins, cooperatively stabilize correctly folded pre-ribosomal RNA. Our findings thus provide a molecular explanation for quality control during eukaryotic ribosome assembly in the nucleolus. Here, using cryo-EM, the authors detail how the yeast co-transcriptional assembly of the large ribosomal subunit involves a quality-control checkpoint. Ribosome-assembly factors implement this checkpoint by probing the formation and ensuring the co-operative stabilization of correctly folded ribosomal RNA.
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