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Mechanical Protein Functions01:58

Mechanical Protein Functions

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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. 
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Three-Dimensional Force System01:30

Three-Dimensional Force System

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In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
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Three-Dimensional Force System:Problem Solving01:30

Three-Dimensional Force System:Problem Solving

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A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...
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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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Equilibrium Conditions for a Particle01:23

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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...
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Non-conservative Forces01:17

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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...
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現代の古典的なタンパク質力場を用いた真空シミュレーションの再考

Vi Toan Lam1, Duy Phuoc Tran1

  • 1School of Life Sciences and Technology, Institute of Science Tokyo (formerly, Tokyo Institute of Technology), 2-12-1 Ookayama, Meguro-Ku, Tokyo 152-8550, Japan.

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まとめ
この要約は機械生成です。

現代の生物分子力場は,真空シミュレーションで不明確な性能を示しています. CMAPや二面角度ではなく,残基間の相互作用が真空中のペプチドサンプリングに大きく影響し,将来の力場開発に役立ちます.

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科学分野:

  • 生物分子シミュレーション
  • 計算化学はコンピュータ化学である.
  • タンパク質のダイナミクス

背景:

  • 溶液シミュレーションでは,古典的なバイオ分子力場が大幅に改良されています.
  • 内部特性を理解するために不可欠な真空シミュレーションにおけるそれらの性能は,理解されがちです.

研究 の 目的:

  • 真空シミュレーションにおける最近の現代生物分子力場の性能を比較する.
  • ペプチドサンプリングと構成空間に対する力場構成要素の影響を調査する.

主な方法:

  • 広範なレプリカ交換分子動力学 (REMD) シミュレーションは9つのペプチドで実施されました.
  • シミュレーション結果を検証するために,量子力学 (QM) の総エネルギー計算を用いた.
  • 分析には,サンプリングの形状,主要コンポーネント (PC) の空間,回転半径,N端からC端までの距離が含まれていました.

主要な成果:

  • CHARMM-GUI CMAP (修正マップ) または二面角関数の処理は,真空シミュレーションサンプリングに有意な影響を及ぼさなかった.
  • 残基間のメインチェーン・サイドチェーン相互作用は,真空シミュレーションにおいて重要な役割を果たしていることが判明しました.
  • 個別に常に支配的ではありませんが, ff14SB 力の場は,研究されたすべてのペプチドの間で累積的に最も高いサンプリングを示しました.

結論:

  • 微積分間の相互作用は,真空中の精密なバイオ分子力場性能に不可欠である.
  • 現在の力場は,これらの相互作用をモデリングする際の精細化を必要とし,移転性が向上する可能性があります.
  • 発見は,将来の普遍的で移転可能な生物分子力場の開発のための洞察を提供します.