相关实验视频
Updated: Apr 28, 2026

10:36
Rare Event Detection Using Error-corrected DNA and RNA Sequencing
Published on: August 3, 2018
14.6K
DNA复制起源许可证的ATPase依赖质量控制
Jordi Frigola1, Dirk Remus, Amina Mehanna
1Cancer Research UK London Research Institute, Clare Hall Laboratories, South Mimms EN6 3LD, UK.
Nature
|March 12, 2013
概括
精确的DNA复制依赖于加载Mcm2-7 DNA酶. 一个保存的Mcm3域通过刺激ORC-Cdc6 ATPase活性来招募Mcm2-7到起源,确保每细胞周期只发生一次复制.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 细胞DNA复制需要在复制原点对Mcm2-7 DNA酶进行精确的加载.
- 由原产地识别复合体 (ORC),Cdc6和Cdt1调解的原产地许可对于每细胞周期复制一次至关重要,但其机制尚不清楚.
研究的目的:
- 在Saccharomyces cerevisiae的原产地许可期间阐明Mcm2-7酶加载的分子机制.
- 确定Mcm3在招募Mcm2-7到复制起源中的作用.
主要方法:
- 研究了Mcm3与ORC-Cdc6复合体之间的相互作用.
- 评估了Mcm3对ORC-Cdc6 ATPase活性的影响.
- 分析了ATP水解对Mcm2-7加载和释放的影响.
主要成果:
- 确定了Mcm3的一个基本的,保存的碳基终端域,它与ORC-Cdc6.6相互作用.
- 证明了这种Mcm3域刺激ORC-Cdc6.6的ATPase活性.
- 表明ORC-Cdc6的ATP水解对Mcm2-7负载至关重要,但在特定条件下也可能导致释放.
结论:
- 麦克米3碳氧终端域是招募麦克米2-7六合体到复制起源的关键因素.
- 一种新型的ATPase依赖机制涉及Mcm3的ORC-Cdc6刺激,调节Mcm2-7的加载和释放.
- 这种机制有助于精确的,每细胞循环一次的DNA复制在真核生物中.
相关概念视频
Proofreading
52.0K
Overview
52.0K
ATP and Macromolecule Synthesis
5.1K
Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
5.1K
Proofreading
7.5K
Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...
Errors During Replication are Corrected by the DNA Polymerase...
7.5K

