Deletion of L4 domains reveals insights into the importance of ribosomal protein extensions in eukaryotic ribosome assembly.

Deletion of L4 domains reveals insights into the importance of ribosomal protein extensions in eukaryotic ribosome assembly.
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DOI:
10.1261/rna.046649.114
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发表时间:
2014-11
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Woolford JL Jr
Woolford JL Jr
中科院分区:
其他
文献类型:
--
作者:
Gamalinda M;Woolford JL Jr

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许多核糖体蛋白具有引人注目的二分结构:位于核糖体外部的球状体和深埋在rRNA核心中的内环。在真核生物中,大量保守的r-蛋白进化出额外的氨基或羧基末端尾序列,这些尾序列穿过溶剂暴露的表面。这些扩展域的生物学重要性仍有待确定。在这项研究中,我们已经调查了普遍保守的内环和真核生物特异性延伸的酵母L4。我们发现,与细菌L4的研究结果相反,删除酵母L4的内环会导致严重受损的生长和大的核糖体亚基的水平降低。我们进一步报告说,虽然耗尽整个L4蛋白会阻止酵母中的早期组装步骤,但仅删除其延伸的内环会影响组装的后期步骤,揭示了L4在核糖体生物发生过程中的第二个作用。令人惊讶的是,L4的整个真核生物特异性羧基末端尾部的缺失对活力、60 S亚基的产生或翻译没有影响。这些意想不到的观察提供了动力,进一步研究核糖体蛋白延伸的功能,特别是真核生物特异性的例子,在核糖体组装和功能。
Numerous ribosomal proteins have a striking bipartite architecture: a globular body positioned on the ribosomal exterior and an internal loop buried deep into the rRNA core. In eukaryotes, a significant number of conserved r-proteins have evolved extra amino- or carboxy-terminal tail sequences, which thread across the solvent-exposed surface. The biological importance of these extended domains remains to be established. In this study, we have investigated the universally conserved internal loop and the eukaryote-specific extensions of yeast L4. We show that in contrast to findings with bacterial L4, deleting the internal loop of yeast L4 causes severely impaired growth and reduced levels of large ribosomal subunits. We further report that while depleting the entire L4 protein blocks early assembly steps in yeast, deletion of only its extended internal loop affects later steps in assembly, revealing a second role for L4 during ribosome biogenesis. Surprisingly, deletion of the entire eukaryote-specific carboxy-terminal tail of L4 has no effect on viability, production of 60S subunits, or translation. These unexpected observations provide impetus to further investigate the functions of ribosomal protein extensions, especially eukaryote-specific examples, in ribosome assembly and function.
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