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Regulated Protein Degradation02:58

Regulated Protein Degradation

It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Regulated Protein Degradation02:58

Regulated Protein Degradation

It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
The Proteasome01:13

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
The Proteasome02:18

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
The Proteasome02:18

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
The Proteasome Structure01:17

The Proteasome Structure

The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...

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Video Experimental Relacionado

Updated: Jun 6, 2026

In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
11:36

In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones

Published on: July 25, 2019

Ubiquitina: misma molécula, diferentes vías de degradación.

Michael J Clague1, Sylvie Urbé

  • 1Institute of Translational Medicine, University of Liverpool, UK. clague@liv.ac.uk

Cell
|November 30, 2010
PubMed
Resumen
Este resumen es generado por máquina.

El etiquetado de ubiquitina se dirige a las proteínas para su degradación a través del proteosoma, lisosoma o autofagosoma. La longitud de la cadena y el enlace determinan la vía de degradación específica, lo que influye en las interacciones y la actividad de la deubiquitinasa.

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Área de la Ciencia:

  • Biología celular Biología celular.
  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular

Sus antecedentes:

  • La ubiquitina (Ub) es una modificación clave después de la traducción.
  • La conjugación de ubiquitina se dirige a los sustratos para su degradación.
  • Las células de los mamíferos utilizan tres vías principales de degradación de las proteínas: proteasomal, lisosomal y autophagosomal.

Objetivo del estudio:

  • Investigar el papel de la ubiquitina en la orientación del sustrato hacia distintas vías de degradación.
  • Explorar cómo las características de la cadena de ubiquitina influyen en la selección de la vía.

Principales métodos:

  • Análisis de la longitud de la cadena de ubiquitina y los tipos de enlace.
  • Evaluación de las interacciones del sustrato con los receptores específicos de la vía.
  • Evaluación de la susceptibilidad a las enzimas de la deubiquitinasa (DUB).

Principales resultados:

  • La ubiquitina sirve como una señal común para las tres principales rutas de degradación.
  • Las propiedades de la cadena de ubiquitina, incluida la longitud y el enlace, dictan el destino del sustrato.
  • Estas propiedades modulan las interacciones con receptores específicos y DUBs.

Conclusiones:

  • Las características de la cadena de ubiquitina son determinantes críticos de la elección de la vía de degradación de las proteínas.
  • Los diferentes patrones de ubiquitinación aseguran la especificidad del sustrato para el proteosoma, el lisosoma y el autofagosoma.
  • Comprender estos mecanismos es vital para comprender la homeostasis de las proteínas celulares.