相关实验视频
Updated: Jul 4, 2025

09:25
In vitro Reconstitution of the Active T. castaneum Telomerase
Published on: July 14, 2011
11.7K
2.7 Å 人类端粒酶H/ACA核糖蛋白的冷-EM结构
George E Ghanim1, Zala Sekne1, Sebastian Balch1
1MRC Laboratory of Molecular Biology, Cambridge, CB2 0QH, UK.
Nature communications
|January 25, 2024
概括
这项研究揭示了人类端粒酶和ACA (H/ACA) 盒子核糖蛋白 (RNP) 的高分辨率结构,揭示了新的分子相互作用. 这有助于我们更好地理解与端粒酶相关的疾病和RNA伪化机制.
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:
- 端粒酶延长端粒,抵消在复制过程中染色体缩短.
- 人类端粒酶包括一个催化核心和一个链和ACA (H/ACA) 盒子核糖蛋白 (RNP) 模块.
- H/ACA RNP对于端粒酶生物发生和RNA伪化至关重要,对于核糖体和结合体组装至关重要.
研究的目的:
- 确定人类端粒酶H/ACA RNP的高分辨率冷电子显微镜结构.
- 为了阐明H/ACA RNP复合体内的新型分子相互作用.
- 了解RNA伪化机制以及疾病突变的影响.
主要方法:
- 低温电子显微镜 (cryo-EM) 在2.7 Å分辨率.
- 端粒酶H/ACA RNP的结构分析.
- 将疾病突变映射到确定结构上.
主要成果:
- 获得了人类端粒酶H/ACA RNP的2.7 Å冷-EM结构,与之前的研究相比显著改善了分辨率.
- 在H/ACA RNP中确定了新的分子相互作用,许多疾病突变局部化到这些部位.
- 揭示了H/ACA RNPs中伪尿化机制的前所未有的见解.
结论:
- 高分辨率结构提供了对人类端粒酶H/ACA RNP的详细分子理解.
- 这些发现澄清了与端粒酶相关的疾病突变的结构基础.
- 这项工作增强了对由真核生物H/ACA RNP介导的伪化机制的理解.
更多相关视频
相关概念视频
Telomeres and Telomerase
23.3K
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
23.3K
Replication in Eukaryotes
13.8K
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
13.8K
Cryo-electron Microscopy
3.3K
Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
3.3K
RNA Structure
4.8K
The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
4.8K
CRISPR and crRNAs
17.0K
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
17.0K
DNA Helicases
21.3K
DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
21.3K

