関連する実験動画
Updated: Jul 11, 2026

08:48
Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
Published on: October 13, 2011
Trpケージ:分子ダイナミクスシミュレーションによる折り畳み動力学と展開状態トポロジー
Christopher D Snow1, Bojan Zagrovic, Vijay S Pande
1Department of Chemistry and Biophysics Program, Stanford University, Stanford, California 94305-5080, USA.
Journal of the American Chemical Society
|December 6, 2002
まとめ
分子動力学シミュレーションにより,Trpケージペプチドの折り畳み経路が明らかになりました. この研究では,折り畳み時間は5.5マイクロ秒と推定され,実験データと一致し,ネイティブ・ステート・アンサンブルを特徴づけています.
科学分野:
- 計算式生体物理学について
- タンパク質の折り畳みダイナミクス
背景:
- タンパク質の折り畳みを理解することは,生物学的機能を解読する上で極めて重要です.
- Trpケージペプチドは,タンパク質の折りたたみメカニズムを研究するためのモデルシステムです.
研究 の 目的:
- Trpケージペプチドの折り畳みプロセスをシミュレートし,分析する.
- 折り畳み時間を決定し,Trpケージのコンフォーマーションアンサンブルを特徴付ける.
主な方法:
- 広範な分子動力学 (MD) シミュレーションを使用しました.
- 実験温度と溶媒粘度で数千回の折り畳みシミュレーションを実施しました.
- アルファ炭素原子の平方根平均偏差 (RMSDcalpha) を分析して,折り畳みを評価する.
主要な成果:
- 116の独立した折り畳みシミュレーションで,RMSDcalphaは3 Å以下で,一部では1.4 Åに達しました.
- 折り畳み時間は 5.5 ± 3.5 マイクロ秒と推定され,実験用運動学と一致しています.
- 同じような平均的なトポロジーを明らかにする折りたたまれたおよび開いたアンサンブルを特徴付けました.
結論:
- 分子ダイナミクスシミュレーションは,Trpケージの折りたたみに関する貴重な洞察を提供します.
- 折り畳み時間とアンサンブル特性は,実験観察と一致しています.
- 展開されたアンサンブルのトポロジーはネイティブ状態に非常に似ており,よく定義された折り畳み経路を示唆しています.
関連する概念動画
Protein Folding
Overview
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.
Mechanisms of Membrane-bending
The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Three-Dimensional Force System:Problem Solving
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...
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...
Method of Joints: Problem Solving I
The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint. Consider a truss structure with two forces of 20 N and 10 N acting at joints C and D, respectively. The method of joints can be used to determine the forces FCB, FDC,...
Method of Joints: Problem Solving II
Consider a truss structure with frictionless joints fixed to a wall and roller support. If a force of 150 N is applied to joint A, the forces in each member of the truss can be determined using the method of joints.

