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Videos de Conceptos Relacionados

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...
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 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...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...

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Video Experimental Relacionado

Updated: Jun 21, 2026

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
09:57

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach

Published on: December 17, 2016

Llegar a la primera base en el ensamblaje del proteasoma.

Henrike C Besche1, Andreas Peth, Alfred L Goldberg

  • 1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

Cell
|July 15, 2009
PubMed
Resumen
Este resumen es generado por máquina.

El proteosoma 26S es el proteosoma 26S.

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Last Updated: Jun 21, 2026

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
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Área de la Ciencia:

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

Sus antecedentes:

  • El proteosoma 26S eucariota es un gran complejo proteico esencial para la degradación de las proteínas celulares.
  • Su montaje es un proceso complejo que requiere una regulación precisa de las interacciones de las subunidades.
  • Comprender el conjunto de partículas reguladoras 19S es crucial para comprender la función del proteosoma.

Objetivo del estudio:

  • Para dilucidar la vía de ensamblaje ordenado de la base de partículas reguladoras 19S.
  • Identificar nuevos complejos precursores y acompañantes involucrados en este proceso de ensamblaje.

Principales métodos:

  • Análisis proteómico de extractos celulares.
  • Ensayos bioquímicos para caracterizar las interacciones de las proteínas.
  • Manipulación genética para estudiar la función de la chaperona.

Principales resultados:

  • Identificación de complejos precursores previamente desconocidos en el ensamblaje de base 19S.
  • Descubrimiento de cuatro chaperones dedicados que facilitan pasos específicos de montaje.
  • Caracterización del orden secuencial de incorporación de las subunidades.

Conclusiones:

  • El ensamblaje de la base de partículas reguladoras 19S es un proceso gradual.
  • Los chaperones dedicados y los complejos precursores específicos son críticos para garantizar la fidelidad del ensamblaje de la base 19S.
  • Este trabajo proporciona un marco para comprender el complejo ensamblaje del proteosoma 26S.