相关实验视频
Updated: Jun 23, 2026
09:25
In vitro Reconstitution of the Active T. castaneum Telomerase
Published on: July 14, 2011
在S.I.S. 端粒酶RNA:二次结构和灵活的支架功能
Karen McMurdie1, Allison N Peeney2, Melissa A Mefford1,3
1Department of Biology, Johns Hopkins University, Baltimore, Maryland, USA.
bioRxiv : the preprint server for biology
|March 3, 2025
概括
研究人员确定了裂变酵母端粒酶RNA (TER1) 的二次结构,揭示了端粒维护的关键区域. 最小的TER1构造保留了催化活性,这表明端粒酶核糖核蛋白复合体的灵活支架组织.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 端粒酶对于真核生物的基因组稳定性至关重要,延长染色体末端以抵消末端复制问题.
- 在重要的模型生物 * Schizosaccharomyces pombe * (裂变酵母) 中,端粒酶RNA (TER1) 的结构在很大程度上仍然未知.
- 了解TER1结构对于理解端粒酶功能及其在预防衰老中的作用至关重要.
研究的目的:
- 为了阐明大裂变酵母TER1RNA的二次结构.
- 确定TER1的功能性重要区域,用于端粒酶活性和端粒维护.
- 为了研究端粒酶核糖核蛋白 (RNP) 复合体的组织原理.
主要方法:
- 遗传学分析和生物信息建模用于预测RNA的二次结构.
- 使用切断突变体的基因分析 * in vivo * 来评估功能重要性.
- 生物化学测试 *在体外* 测试修改的TER1结构的催化活性.
主要成果:
- 确定了1212nt裂变酵母TER1RNA的详细的二次结构模型.
- 发现TER1的特定保存区域对于端粒维护至关重要,而很大一部分是可以放弃的.
- 基本的三向连接图案被证明在TER1.1中具有功能多样性.
- 一个最小的TER1构造 (Mini-TER1),包括催化核心和三路结,用TERT* *in vitro* 重构了端粒酶活性.
结论:
- TER1 作为端粒酶 RNP 的灵活支架,类似于发芽酵母 TLC1.1. 的功能.
- 二级结构模型提供了关于裂变酵母端粒酶的物理和功能组织的见解.
- 保护区域对TER1功能至关重要,突出了它们在不同酵母物种的端粒维护中的重要性.
相关概念视频
01:23RNA Structure
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. 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): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. 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): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
02:41Telomeres and Telomerase
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 DNA.
01:23RNA Structure
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. 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): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. 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): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
01:19RNA Structure
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...
01:29Replication in Eukaryotes
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...
02:41Telomeres and Telomerase
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 DNA.