Video Experimental Relacionado

Updated: Jun 18, 2026

Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo

Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo

Published on: October 23, 2016

Prevención de la desnaturalización de proteínas bajo estrés térmico por la chaperonina Hsp6060

J Martin¹, A L Horwich, F U Hartl

¹Program of Cellular Biochemistry and Biophysics, Rockefeller Research Laboratories, Sloan-Kettering Institute, New York, NY 10021.

Science (New York, N.Y.)

|November 6, 1992

Resumen

Las células utilizan proteínas de choque térmico (HSP) para combatir el estrés ambiental. La proteína de choque térmico mitocondrial 60 (Hsp60) protege las proteínas celulares como la dihidrofolato reductasa (DHFR) del daño por calor y ayuda al repliegue.

Área de la Ciencia:

Biología Molecular Biología Molecular
Respuesta Celular al Estrés Respuesta Celular al Estrés
El plegamiento de las proteínas.

Sus antecedentes:

El aumento de la síntesis de proteínas de choque térmico (HSP) es una respuesta celular común al estrés ambiental.
Los mecanismos de protección de los HSP en las estructuras celulares no se comprenden completamente.
La proteína de choque térmico mitocondrial 60 (Hsp60) está implicada en la protección celular bajo estrés.

Objetivo del estudio:

Para investigar el papel de la Hsp60 mitocondrial en la protección de las proteínas celulares del estrés térmico.
Para dilucidar el mecanismo por el cual Hsp60 estabiliza las proteínas durante la exposición al calor.

Principales métodos:

Estudió la formación de complejos Hsp60 con polipéptidos en orgánulos estresados por el calor.
Se evaluó la necesidad de Hsp60 para prevenir la inactivación térmica de la dihidrofolato reductasa (DHFR) importada en las mitocondrias.
Se realizaron experimentos in vitro para observar la unión de Hsp60 a DHFR denaturado térmicamente y su efecto en la agregación y el replegamiento.

Principales resultados:

La Hsp60 mitocondrial forma complejos con varios polipéptidos en los orgánulos bajo estrés térmico.
Hsp60 es esencial para prevenir la inactivación térmica de la dihidrofolato reductasa mitocondrial (DHFR) in vivo.
In vitro, Hsp60 se une al DHFR desnaturalizado, inhibe su agregación y facilita el replegamiento dependiente de ATP a temperaturas elevadas.

Conclusiones:

El Hsp60 mitocondrial juega un papel crítico en la protección de las proteínas celulares de la desnaturalización térmica.
Los miembros de la familia Hsp60 probablemente emplean un mecanismo general para estabilizar las proteínas existentes bajo condiciones de estrés celular.

Más Videos Relacionados

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

Escherichia coli -Based Complementation Assay to Study the Chaperone Function of Heat Shock Protein 70

Escherichia coli -Based Complementation Assay to Study the Chaperone Function of Heat Shock Protein 70

Published on: March 8, 2024

Videos de Conceptos Relacionados

Protein Folding

Protein Folding

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...

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...

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...

Protein Denaturation

Protein Denaturation

The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...

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...