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相关概念视频

DNA Topoisomerases02:02

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.  Type I...
Mechanical Protein Functions01:58

Mechanical Protein Functions

Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
Protein Folding01:25

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Folding01:22

Protein Folding

Overview
Protein Folding01:22

Protein Folding

Overview
Protein-protein Interfaces02:04

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...

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相关实验视频

Updated: Jun 8, 2026

Multiplexed Single-molecule Force Proteolysis Measurements Using Magnetic Tweezers
10:08

Multiplexed Single-molecule Force Proteolysis Measurements Using Magnetic Tweezers

Published on: July 25, 2012

在蛋白质中解开结.

Joanna I Sułkowska1, Piotr Sułkowski, Piotr Szymczak

  • 1Center for Theoretical Biological Physics, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92037, USA. jsulkow@physics.ucsd.edu

Journal of the American Chemical Society
|September 23, 2010
PubMed
概括

解开蛋白质结的方法取决于你在哪里拉. 拉动特定的氨基酸可以解开结,而不是拉动末端,这会使它们变得更紧. 这项研究探讨了影响结节解锁成功的因素.

科学领域:

  • 生物物理学的生物物理.
  • 分子生物学分子生物学
  • 软物质物理学 软物质物理学

背景情况:

  • 蛋白结是复杂的拓结构,可以影响蛋白质的功能.
  • 解开蛋白结是具有挑战性的,因为它们的复杂性质和热波动的影响.
  • 目前操纵蛋白结的方法有限,阻碍了实验进展.

研究的目的:

  • 通过分析拉动特定位置的影响来研究蛋白质结解的机制.
  • 为了确定拉动策略,速度和温度如何影响成功解开蛋白结的概率.
  • 为实验实现蛋白质结解开提供见解.

主要方法:

  • 拉动蛋白质链的计算模拟,具有不同的抓地点和参数.
  • 在模拟拉动实验中分析节点拓和形状变化.
  • 对解锁概率与拉动位置,速度和温度的依赖性的系统研究.

主要成果:

  • 拉动蛋白终端始终会紧紧结,导致解锁失败.
  • 针对特定氨基酸的向拉动可以促进脊柱段的收缩和结节的解.
  • 成功解开结的概率非常敏感,取决于所选择的拉动位置,拉动速度和温度.

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OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy
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OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy

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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

Published on: October 25, 2017

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Multiplexed Single-molecule Force Proteolysis Measurements Using Magnetic Tweezers
10:08

Multiplexed Single-molecule Force Proteolysis Measurements Using Magnetic Tweezers

Published on: July 25, 2012

OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy
08:34

OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy

Published on: February 5, 2020

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

Published on: October 25, 2017

结论:

  • 通过战略性拉动特定的氨基酸残留物来实现蛋白结的机械操纵.
  • 了解拉动参数和结解动态之间的相互作用对于实验成功至关重要.
  • 这项研究为开发控制和操纵蛋白质拓学的新方法奠定了基础.