Video Experimental Relacionado

Updated: May 23, 2026

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

Los cambios conformacionales desencadenados por el ATP delinean la mecánica de unión y plegado del sustrato de la

Daniel K Clare¹, Daven Vasishtan, Scott Stagg

¹Crystallography and Institute of Structural and Molecular Biology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK.

|March 27, 2012

Resumen

La proteína GroEL de la chaperonina, junto con la cochaperonina GroES, utiliza ATP para encapsular y plegar las proteínas. Las distintas conformaciones GroEL-ATP revelan un proceso mecánico para expulsar sustratos mal plegados en una cámara hidrófila.

Área de la Ciencia:

Biología molecular La biología molecular.
Biología estructural Biología estructural.
La bioquímica es la bioquímica.

Sus antecedentes:

Las chaperoninas como GroEL son esenciales para el plegamiento de las proteínas.
GroEL facilita el plegamiento de polipéptidos nacientes o desnaturalizados.
La unión de ATP y la cochaperonina GroES son críticas para la función de GroEL.

Objetivo del estudio:

Para resolver las distintas conformaciones GroEL-ATP.
Comprender el mecanismo mecánico del plegamiento y la eyección de proteínas por GroEL.
Para aclarar el papel de los movimientos de dominio en la captura y liberación de sustrato.

Principales métodos:

La microscopía criolectrónica es una técnica de microscopía criolectrónica.
Análisis estadístico El análisis estadístico.
Técnicas de adaptación flexibles para el montaje.

Principales resultados:

Se determinó una trayectoria de las conformaciones de GroEL-ATP, que muestra la rotación y elevación del dominio.
Las conformaciones iniciales capturan sustratos polipeptídicos.
Las conformaciones extendidas ejercen fuerza mecánica y facilitan la unión de GroES para la eyección del sustrato.

Conclusiones:

Las conformaciones GroEL-ATP definen una vía mecánica para el plegamiento de las proteínas.
Los movimientos de dominio son cruciales para la unión, manipulación y liberación del sustrato.
El sistema GroEL-GroES-ATP proporciona un mecanismo robusto para la homeostasis de las proteínas celulares.

Más Videos Relacionados

Single-Molecule FRET Imaging for Observing the Conformational Dynamics of Dynamin-Like GTPase Atlastin

Single-Molecule FRET Imaging for Observing the Conformational Dynamics of Dynamin-Like GTPase Atlastin

Published on: January 24, 2025

Analysis of Protein Folding, Transport, and Degradation in Living Cells by Radioactive Pulse Chase

Analysis of Protein Folding, Transport, and Degradation in Living Cells by Radioactive Pulse Chase

Published on: February 12, 2019

Videos de Conceptos Relacionados

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

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...

Bacterial Protein Maturation

Bacterial Protein Maturation

Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...

Protein Folding

Protein Folding

Protein Folding

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 Folding

Protein Folding