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Molecular Chaperones and Protein Folding

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...

Molecular Chaperones and Protein Folding

Molecular Chaperones and Protein Folding

Induced-fit Model

Induced-fit Model

Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical...

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Updated: Mar 17, 2026

Studies of Chaperone-Cochaperone Interactions using Homogenous Bead-Based Assay

Studies of Chaperone-Cochaperone Interactions using Homogenous Bead-Based Assay

Published on: July 21, 2021

NMR情報型分子モデリングを用いたダイナミックチャペロン-基板相互作用の捉え方

Loïc Salmon¹, Logan S Ahlstrom^1,2, Scott Horowitz¹

¹Department of Molecular, Cellular and Developmental Biology, and the Howard Hughes Medical Institute, University of Michigan , Ann Arbor, Michigan 48109, United States.

Journal of the American Chemical Society

|July 15, 2016

まとめ

この要約は機械生成です。

Spyのようなチャペロンは,免疫タンパク質7 (Im7) のような基板とダイナミックに相互作用することで,タンパク質の折り畳みを支援する. この研究は,Spy がどのように

さらに関連する動画

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry

Published on: June 7, 2018

Exploring Biomolecular Interaction Between the Molecular Chaperone Hsp90 and Its Client Protein Kinase Cdc37 using Field-Effect Biosensing Technology

Exploring Biomolecular Interaction Between the Molecular Chaperone Hsp90 and Its Client Protein Kinase Cdc37 using Field-Effect Biosensing Technology

Published on: March 31, 2022

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Last Updated: Mar 17, 2026

Studies of Chaperone-Cochaperone Interactions using Homogenous Bead-Based Assay

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Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry

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Exploring Biomolecular Interaction Between the Molecular Chaperone Hsp90 and Its Client Protein Kinase Cdc37 using Field-Effect Biosensing Technology

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Published on: March 31, 2022

科学分野:

生化学と分子生物学
構造生物学
コンピュータ生物学

背景:

チャペロンは,タンパク質の結合を防止し,適切なタンパク質の折り畳みを促進することによって,プロテオスタシスの維持に不可欠です.
チャペロンが基質構造動態に影響を与える正確なメカニズムは,まだ完全に理解されていません.

研究の目的:

シャペロンSpyとその基質免疫タンパク質7 (Im7) の間の残留レベルでのダイナミックな相互作用を解明する.
柔軟な生物分子複合体を研究するためのシミュレーションとNMRデータを統合した計算アプローチを開発し,検証する.

主な方法:

個別の結合パートナーのためにシステム固有の力場を構成するために,サイト固有の核磁気共振 (NMR) データを利用した.
チャペロン基板複合体のダイナミクスをモデル化するために,粗粒子の分子シミュレーションを使用した.
実験的な生体物理的な測定と比較して検証されたシミュレーション結果

主要な成果:

シミュレーションはSpy-Im7複合体の結合データを正確に再現した.
結合すると,Im7の折りたたみには形状交換の減少が伴い,Spyの柔軟な領域は様々な基板形状との相互作用を高めます.
Spyは,よく折れた状態でIm7の放出を促進し,基板のダイナミクスをバランスさせます.

結論:

統合されたNMRとシミュレーションアプローチは,ダイナミックなシャペロン-基板相互作用の詳細な,残基レベルの理解を提供します.
この戦略は,他の柔軟な生物分子システムを調査するための汎用性のあるプラットフォームを提供します.
この発見はシェパロン媒介のタンパク質の折り畳み経路の理解を強化しています