通过CDK7进行RNAPIICTD相分离和酸化的序列和结构决定因素
Katerina Linhartova1,2, Francesco Luca Falginella1, Martin Matl1
1CEITEC - Central European Institute of Technology, Masaryk University, Brno, Czechia.
Nature communications
|October 25, 2024
概括
RNA聚合酶II的碳氧终端域 (CTD) 使用氨酸和氨酸残留物来驱动液-液相分离 (LLPS). 特定的林构造和氨酸相互作用是这一过程的关键,并通过CDK7.7进行调节.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- RNA聚合酶II的碳氧终端域 (CTD) 本质上是无序的,对转录至关重要.
- 在体内,CTD促进RNA聚合酶II的液态分离 (LLPS).
- 对CTD在LLPS中的作用的直接生化表征是有限的.
研究的目的:
- 阐明控制人类CTDLLPS的序列编码分子语法.
- 在生物化学上描述CTDLLPS中保存的七度残留的作用.
- 了解CTD结构,LLPS和CDK7.7的酸化之间的相互作用.
主要方法:
- 系统地生成CTD变体.
- 在体外生化测试.
- 分子动力学模拟.分子动力学模拟.
主要成果:
- 氨酸的芳香性和氨酸的 cis-trans 异构化对于 CTD 阶段分离至关重要.
- 基斯普罗林形态和SPXX图案β转向促进一个紧的CTD组合和间残留相互作用.
- 林和氨酸残留物对于通过CDK7.7进行CTD酸化至关重要.
- CDK7在LLPS滴中加速CTD酸化,导致过酸化和释放.
结论:
- 在CTD间距区域内,分离氨酸残留物的形状受限结构对于LLPS至关重要.
- 该研究揭示了CTDLLPS的分子基础及其调节.
- 这些发现提供了通过CTD相分离和酸化对转录的动态控制的见解.
相关概念视频
Eukaryotic RNA Polymerases
23.7K
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
23.7K
Positive Regulator Molecules
5.4K
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
5.4K
Separation of Sister Chromatids
3.6K
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
3.6K
Transcription Initiation
16.3K
Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
The promoters and enhancers and their accessory proteins allow tight regulation of...
16.3K
M-Cdk Drives Transition Into Mitosis
5.5K
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
5.5K
S-Cdk Initiates DNA Replication
4.7K
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...
4.7K


