欧核生物40S核糖体亚单元的晶体结构与启动因子1的复合体
Julius Rabl1, Marc Leibundgut, Sandro F Ataide
1Institute of Molecular Biology and Biophysics, ETH Zürich, Schafmattstrasse 20, 8093 Zürich, Switzerland.
Science (New York, N.Y.)
|January 6, 2011
概括
这项研究揭示了与真核细胞启动因子1 (eIF1) 结合的Tetrahymena thermophila 40S核糖体亚单元的结构. 这为真核细胞蛋白质合成启动机制提供了新的见解.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 细胞核糖体比细菌核糖体更大,更复杂.
- 细菌和真核生物之间蛋白质合成的启动有显著差异.
- 40S小核糖体亚单元对于真核细胞的翻译启动至关重要.
研究的目的:
- 为了确定 Tetrahymena thermophila 40S 核糖体子单元与真核生物启动因子 1 (eIF1) 复合体中的晶体结构.
- 阐明40S子单元与eIF1.1之间的相互作用.
- 为了了解真核生物特异性蛋白质合成机制.
主要方法:
- 在X射线晶体学.
- 确定一个3.9安格斯特罗姆分辨率结构的确定.
- 核糖体RNA和蛋白质的结构分析.
主要成果:
- 揭示了18S核糖体RNA和40S子单元的所有核糖体蛋白质的完整折叠.
- 定义了40S子单位和eIF1之间的特定相互作用.
- 提供了关于真核细胞特异性蛋白质合成的见解,包括eIF1功能和RACK1和rpS6e的调节.
结论:
- 确定的结构提供了对真核40S核糖体子单元及其与eIF1.1的相互作用的详细视图.
- 这项工作增强了对控制真核细胞翻译启动的分子机制的理解.
- 这些发现揭示了特定核糖体蛋白在翻译调节中的作用.
相关概念视频
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Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within...
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within...
01:27Ribosomes
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.Ribosome Structure and AssemblyRibosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within the...
01:27Ribosomes
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within...
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within...
01:27Ribosomes
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.Ribosome Structure and AssemblyRibosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within the...
02:53Ribosomal RNA Synthesis
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
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02:53Ribosomal RNA Synthesis
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
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