相关实验视频
Updated: Jan 25, 2026

07:48
Working with Human Tissues for Translational Cancer Research
Published on: November 26, 2015
10.3K
在人类同翻译N-myristoylation的结构基础
Timo Denk1, Paul Monassa2, Joanna Musial1
1Gene Center and Department of Biochemistry, Feodor-Lynen-Str. 25, Munich, LMU Munich, Germany.
Nature communications
|January 23, 2026
概括
一个关键的蛋白质修饰N-myristoylation在人类核糖体上被结构性地揭示出来. N-myristoyltransferases (NMTs) 连续与其他酶结合,就像新生链的陪伴者一样.
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:
- 协同翻译的蛋白质修饰对于蛋白质功能至关重要.
- N-myristoylation 是一种由N-myristoyltransferases (NMTs) 催化的一种必不可少的N-终端脂质修饰.
- 虽然NMT被认为是潜在的药物标,但它们与核糖体结合的机制尚不清楚.
研究的目的:
- 阐明人类核糖体上同翻译N-myristoylation的结构基础.
- 了解NMT1与翻译核糖体和相关因素的相互作用.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 可视化复杂物.
- 对与人类核糖体结合的NMT1进行结构分析.
主要成果:
- 冷-EM结构显示NMT1结合在突出口附近,与新生的多相关复合体 (NAC) 相互作用.
- 氨酸切除和N-myristoylation发生顺序,而不是同时,涉及连续的核糖体结合.
- NMT1与NAC一起表现出一种潜在的协同翻译的伴侣式功能,用于延长新生的链条.
结论:
- 这项研究提供了对人类核糖体上协同翻译N-myristoylation的第一个结构性见解.
- 这些发现揭示了一种顺序的酶机制,以及NMT1.1.的新型伴侣式作用.
- 了解这种机制为针对治疗干预的NMT奠定了基础.
相关概念视频
Translation
156.0K
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
156.0K
Translation
17.7K
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are...
Translation Produces the Building Blocks of Life
Proteins are...
17.7K
Initiation of Translation
38.5K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
38.5K
Termination of Translation
27.5K
The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
27.5K
Termination of Translation
6.6K
6.6K
Improving Translational Accuracy
14.1K
Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
14.1K

