相关实验视频
Updated: May 16, 2026

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In vitro Reconstitution of the Active T. castaneum Telomerase
Published on: July 14, 2011
来自实验衍生约束和建模的Tetrahymena端粒酶RNA的新模型
Daud I Cole1, Jason D Legassie, Laura N Bonifacio
1Department of Biochemistry and Biophysics, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.
Journal of the American Chemical Society
|November 21, 2012
概括
端粒酶RNA (TER) 在结合端粒酶逆转录酶 (TERT) 时经历了显著的结构变化. 这项研究揭示了自由TER中的新型干III,并模拟了对端粒复制至关重要的TER-TERT相互作用.
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:
- 端粒酶核糖核蛋白复合体对于真核细胞染色体复制是必不可少的.
- 端粒酶RNA (TER) 的功能包括模板,蛋白质结合和催化.
- 由于缺少端粒酶复合体内的结构数据,难以理解TER的非模板作用.
研究的目的:
- 研究 Tetrahymena TER 在溶液中的结构,以及与 tTERT 结合时的结构.
- 为了阐明TER在端粒酶组合过程中的形状变化.
- 模拟TER和tTERT之间的分子相互作用.
主要方法:
- 选择性2'-基乙化分析通过原料扩展 (SHAPE) 来探测TER结构.
- 使用SHAPE,FRET和生物化学数据进行离散分子动力学模拟.
- 模拟的TER结构与Tetrahymena tTERT的同质模型的对接.
主要成果:
- 在自由和绑定的TER之间观察到显著的形状差异.
- 在tTER伪结中确立了基数三倍的直接证据.
- 在自由 TER 中确定了一个新的干 III 区域,包括模板和伪结域.
- 端粒酶组合的模型表明,干III解有助于tTERT活性位点的结合.
- 一个干循环IV功能的模型建议通过与TER干IV结合来激活tTERT.
结论:
- 在与tTERT组装时,TER经历了实质性的结构重组.
- 鉴定到的TER结构和建模的相互作用为端粒酶功能提供了洞察力.
- 这项工作为端粒酶组装和激活机制提供了一个分子模型.
相关概念视频
Telomeres 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.
Telomeres 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.
Bacterial RNA Polymerase
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
RNA 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...
RNA 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...
Replication 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...

