Structural insights into the assembly of the 30S ribosomal subunit in vivo: functional role of S5 and location of the 17S rRNA precursor sequence.

Structural insights into the assembly of the 30S ribosomal subunit in vivo: functional role of S5 and location of the 17S rRNA precursor sequence.
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体内 30S 核糖体亚基组装的结构见解:S5 的功能作用和 17S rRNA 前体序列的位置

DOI:
10.1007/s13238-014-0044-1
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发表时间:
2014-05
期刊:
影响因子:
21.1
通讯作者:
Gao, Ning
Gao, Ning
中科院分区:
生物学1区
文献类型:
--
作者:
Yang, Zhixiu;Guo, Qiang;Goto, Simon;Chen, Yuling;Li, Ningning;Yan, Kaige;Zhang, Yixiao;Muto, Akira;Deng, Haiteng;Himeno, Hyouta;Lei, Jianlin;Gao, Ning

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核糖体亚基的体内组装是一个高度复杂的过程,蛋白质组装和rRNA成熟事件之间有密切的协调,如rRNA前体的折叠和加工,以及选定碱基的修饰。在单元格中,需要大量的因素来保证亚单位生产的效率和保真度。在这里,我们描述了在一个因子缺失的大肠杆菌菌株(∆rsgA∆RbfA)中积累的未成熟的30S亚基。在缓冲体系中,随着盐浓度的不同,分离的未成熟的30S亚基在蛋白质组成和结构上都显示出有趣的差异。具体地说,在两种不同的盐条件下得到的中间体(高盐和低盐)可能反映了两个不同的组装阶段,分别是3‘结构域组装的相对早期和晚期。详细的结构分析表明,17S rRNA 5‘端的成熟与30S头部结构域的组装之间存在机械耦合,并归因于S5在协调这两个事件中的独特作用。此外,我们的结构结果可能揭示了17S rRNA未处理的末端序列的位置,并表明17S rRNA的成熟事件可以作为亚基生产和蛋白质翻译的质量控制机制。
The in vivo assembly of ribosomal subunits is a highly complex process, with a tight coordination between protein assembly and rRNA maturation events, such as folding and processing of rRNA precursors, as well as modifications of selected bases. In the cell, a large number of factors are required to ensure the efficiency and fidelity of subunit production. Here we characterize the immature 30S subunits accumulated in a factor-null Escherichia coli strain (∆rsgA∆rbfA). The immature 30S subunits isolated with varying salt concentrations in the buffer system show interesting differences on both protein composition and structure. Specifically, intermediates derived under the two contrasting salt conditions (high and low) likely reflect two distinctive assembly stages, the relatively early and late stages of the 3' domain assembly, respectively. Detailed structural analysis demonstrates a mechanistic coupling between the maturation of the 5' end of the 17S rRNA and the assembly of the 30S head domain, and attributes a unique role of S5 in coordinating these two events. Furthermore, our structural results likely reveal the location of the unprocessed terminal sequences of the 17S rRNA, and suggest that the maturation events of the 17S rRNA could be employed as quality control mechanisms on subunit production and protein translation.
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发表时间: 2004-03-01
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