细菌核糖体的快速结构分析 in situ
Barrett M Powell1, Tyler S Brant2,3, Joseph H Davis4,5
1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA.
Communications biology
|January 28, 2025
概括
一个新的工作流程使得快速的现场冷电子断层扫描 (cryo-ET) 能够对细胞组件进行快速的结构分析. 这种方法在不到10天的时间内实现了大肠杆菌70S核糖体的5.8 Å分辨率结构.
科学领域:
- 结构生物学 结构生物学
- 显微镜的使用方法
- 分子生物学分子生物学
背景情况:
- 低温电子显微镜 (cryo-EM) 已经推进了蛋白质结构的确定.
- 用于细胞内部结构分析的冷电子断层扫描 (cryo-ET) 在样本准备,成像和数据处理方面面临瓶.
- 从冷ET中获得亚纳米分辨率结构是常规获得的挑战.
研究的目的:
- 开发一个快速的工作流程,用于in situ冷ET样品的准备和数据分析.
- 为了使常规的亚纳米分辨率细胞组件的结构确定.
- 为了克服冷ET现有的技术瓶.
主要方法:
- 开发了一个精简的冷ET样品制备协议.
- 实施了一个高效的数据处理管道,用于冷ET数据.
- 将工作流应用于大肠杆菌,以确定核糖体结构.
主要成果:
- 在in situ. ribosomal结构中实现了常规的亚纳米分辨率.
- 在不到10天的时间内从细胞中确定了大肠杆菌70S核糖体的5.8 Å分辨率结构.
- 发现了一小群100S类异构体.
结论:
- 开发的工作流显著加快了使用冷ET的现场结构分析.
- 这种方法有助于快速的细菌核糖体和潜在的其他细胞组件的结构确定.
- 该方法预计将广泛适用于各种细菌样本.
相关概念视频
02:24Ribosome Profiling
3.5K
Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...
3.5K
02:53Ribosomal RNA Synthesis
13.1K
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,...
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,...
13.1K