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関連する概念動画

Fluid Mosaic Model01:34

Fluid Mosaic Model

The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.LipidsThe most...
Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
Non-conservative Forces01:17

Non-conservative Forces

Non-conservative forces are dissipative forces such as friction or air resistance. These forces take energy away from a system as it progresses. Unlike conservative forces, non-conservative forces do not have potential energy associated with them. This is because the energy is lost to the system and cannot be turned into useful work later.
Also unlike their conservative counterparts, they are path-dependent; where the object starts and stops does matter. For example, a grinding wheel applies a...
Equilibrium Conditions for a Particle01:23

Equilibrium Conditions for a Particle

When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
The Kinetic Model of Gases01:24

The Kinetic Model of Gases

The kinetic model of gases explains the properties of a perfect gas using three main assumptions: molecules move in ceaseless random motion, their size is negligible compared to the distances between them, and they do not interact except during perfectly elastic collisions. The total energy of a gas is the sum of the kinetic energies of all its constituent molecules. The pressure exerted by the gas arises from the continual bombardment of the container walls by billions of colliding molecules.
Reaction Mechanisms: The Steady-State Approximation01:26

Reaction Mechanisms: The Steady-State Approximation

The steady-state approximation, also referred to as the quasi-steady-state approximation to differentiate it from a true steady state, is a widely used method for simplifying calculations in complex reaction mechanisms. This approach is particularly useful when dealing with multi-step reactions that involve reverse reactions or several steps, which can significantly increase mathematical complexity and make the reactions nearly unsolvable analytically.The steady-state approximation operates on...

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関連する実験動画

Updated: Jun 29, 2026

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
13:58

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

Published on: September 28, 2016

ペプチドループの閉塞動態は,明示的な溶媒におけるマイクロ秒分子動態シミュレーションによる明示的な溶媒のシミュレーションによる.

In-Chul Yeh1, Gerhard Hummer

  • 1Laboratory of Chemical Physics, Building 5, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, USA.

Journal of the American Chemical Society
|June 6, 2002
PubMed
まとめ
この要約は機械生成です。

分子ダイナミクスシミュレーションでは,ペプチドのエンドツーエンドの接触が10秒以内に急速に形成されることが示されています. この発見は,トリプトファンのトリプレート状態の寿命の実験的測定と一致し,早期のタンパク質折り畳みイベントの洞察を提供します.

さらに関連する動画

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

関連する実験動画

Last Updated: Jun 29, 2026

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
13:58

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

Published on: September 28, 2016

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

科学分野:

  • バイオフィジックス 生物物理学
  • コンピューティング・ケミストリー
  • タンパク質の折り畳みダイナミクス

背景:

  • ペプチドのエンドツーエンドコンタクト形成率の実験的な測定は,トリプトファンのトリプレート quenchingを使用して最近行われました.
  • ペプチド・ループ・クロージング・キネティクスを理解することは,タンパク質の折りたたみにおける初期の出来事を解明するために極めて重要です.

研究 の 目的:

  • 全原子明示溶媒分子ダイナミクスシミュレーションを使用して,異なる長さの2つのペプチドのループ閉鎖運動を調査する.
  • シミュレーション結果を実験データと直接比較し,ペプチドの動態を展開状態で分析する.

主な方法:

  • 異なる初期条件と力場 (AMBER,CHARMM) を有するCys-(Ala-Gly-Gln) n-Trpペプチド (n=1,2) のための複数の全原子明示溶媒分子動力学シミュレーションを実施しました.
  • 原子解像度分析のために,広範なシミュレーションデータを収集しました (ペンタペプチドの場合は 1.0-0.8マイクロ秒,オクタペプチドの場合は ~0.5マイクロ秒).
  • 初期のタンパク質の折りたたみイベントを調査するために,展開状態のペプチドダイナミクスを分析しました.

主要な成果:

  • トリプトファンのトリプレット状態の計算された寿命は50〜100nsの範囲にあり,実験結果と一致しています.
  • エンドツーエンドのコンタクト形成率が著しく上昇し,特徴的な時間は10ns未満であった.
  • AMBERとCHARMMの力場間の接触形成率は,ペプチド構成組の変動にもかかわらず,類似していることが実証されました.

結論:

  • 分子ダイナミクスシミュレーションは,初期のタンパク質の折り畳みダイナミクスに関する貴重な原子解像度の洞察を提供します.
  • ペプチドのエンドツーエンド接触形成は,実験データのいくつかの解釈によって先ほど示唆されたより速い時間スケールで発生する急速なプロセスです.
  • フォースフィールドの選択 (AMBER vs. CHARMM) は,これらのペプチドの計算されたエンドツーエンド接触形成率に最小限の影響を及ぼします.