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関連する概念動画

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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関連する実験動画

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

タンパク質の結び目を解き放つ.

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
まとめ

タンパク質の結び目を解き放つのは,どこに引っ張るかによって異なります. 特定のアミノ酸を引っ張ると結び目が解くことができるが,端を引っ張ると結び目が固まる. この研究は,結び目の解き成功に影響を与える要因を探求しています.

科学分野:

  • バイオフィジックス 生物物理学
  • 分子生物学は分子生物学である.
  • ソフトマター物理学 ソフトマター物理学

背景:

  • タンパク質のノードは,タンパク質の機能に影響を及ぼす複雑なトポロジカルな構造です.
  • タンパク質の結び目を解き放つのは,その複雑な性質と熱変動の影響により困難です.
  • タンパク質のノードを操作する現在の方法は限られており,実験の進展を妨げています.

研究 の 目的:

  • 特定の部位を引っ張る効果を分析することによって,タンパク質の結び目の解き放つメカニズムを調査する.
  • 引っ張る戦略,速度,および温度が,タンパク質の結び目をうまく解く確率にどのように影響するか判断する.
  • タンパク質の結び目の解き方を実験的に実現するための洞察を提供すること.

主な方法:

  • 異なる握り点とパラメータでタンパク質鎖を引っ張る計算シミュレーション.
  • 模擬引く実験中のノットトポロジーと構成の変化の分析.
  • 引っ張る場所,速度,温度に対する解き放つ確率の依存性の体系的な研究.

主要な成果:

  • タンパク質の末端を引っ張ると常に結び目が緊縮し,解き放たれに繋がります.
  • 特定のアミノ酸をターゲットに引っ張ることは,骨幹のセグメントの引き戻しと結び目の解き方を容易にすることができます.

さらに関連する動画

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
08:00

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

Published on: October 25, 2017

関連する実験動画

Last 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

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
08:00

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

Published on: October 25, 2017

  • 結び目をうまく解く確率は,選択された引く場所,引く速度,および温度に非常に敏感です.

    • 結論:

    • タンパク質のノードの機械的操作は,特定のアミノ酸残基の戦略的引きずりを通じて実現可能である.
    • 引っ張るパラメータと結び目の解き放つダイナミクスの相互作用を理解することは,実験の成功にとって極めて重要です.
    • この研究は,タンパク質のトポロジーを制御および操作するための新しい方法の開発のための基礎を築いています.