相关实验视频

Updated: Apr 29, 2026

Magnetic Tweezers for the Measurement of Twist and Torque

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

解读由Rmi1调制的人类TopIIIα活动,使用磁子

Long Yun¹, Florence Garnier^1,2,3, Terence R Strick^1,3

¹Institut de Biologie de l'Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, PSL University, INSERM, CNRS, Paris 75005, France.

Nucleic acids research

|April 23, 2025

概括

拓酶IIIα (TopoIIIα) 酶对于基因组的稳定性至关重要. 合作伙伴蛋白Rmi1显著增强了TopoIIIαα的作用.

科学领域:

分子生物学分子生物学
生物化学生化学
遗传学是一个遗传学.

背景情况:

拓酶IA (TopoIAs) 是一种在生命的各个领域发现的必不可少的酶.
甲基动物通常具有两个TopoIAs:TopIIIα和TopIIIβ,它们执行不同的细胞功能.
托普IIIα通过在复制和重组过程中解决DNA拓问题,在维持基因组稳定性方面发挥着至关重要的作用.

研究的目的:

阐明Topoisomerase IIIα (TopoIIIα) 的详细酶循环.
为了研究伙伴蛋白Rmi1在TopoIIIα功能中的精确作用.
用单分子方法区分内在的TopoIIIα催化特性和Rmi1调节的特性.

主要方法:

使用单分子方法分析Topoisomerase IIIα (TopoIIIα) 酶循环.
研究了TopoIIIα及其伴侣蛋白Rmi1.1之间的相互作用.
具有DNA结合动力学和复杂稳定性的特征.

主要成果:

拓酶IIIα (TopoIIIα) 的速率限制步骤是DNA结合,这需要一个单链DNA区域.
在其催化周期中,TopoIIIα表现出长时间的暂停,以稳定开放的分裂复合体.
通过促进单链DNA的捕获和稳定分裂复合体,促进基质歧视,Rmi1提高了TopoIIIα的效率.

结论:

Rmi1是一种关键的合作伙伴蛋白,可显著提高Topoisomerase IIIα (TopoIIIα) 的效率和基质特异性.
Rmi1对DNA结合和复杂稳定的调节对于顺的体内DNA交易过程至关重要.
了解TopoIIIα-Rmi1相互作用,可以了解基因组稳定机制.

更多相关视频

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions

Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions

Published on: August 30, 2024

相关概念视频

DNA Topoisomerases

DNA Topoisomerases

Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types. ...

Conservative Site-specific Recombination and Phase Variation

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...

Destabilization of Microtubules

Destabilization of Microtubules

The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...