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The Proteasome02:18

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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.
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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Method for Measuring the Activity of Deubiquitinating Enzymes in Cell Lines and Tissue Samples
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Definir el paisaje de interacción de la enzima deubiquitinante humana.

Mathew E Sowa1, Eric J Bennett, Steven P Gygi

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

Cell
|July 21, 2009
PubMed
Resumen

Los investigadores mapearon las interacciones de proteínas para las enzimas deubiquitinantes (Dubs), revelando sus roles en procesos celulares cruciales. Este estudio proporciona una comprensión fundamental del interactoma Dub y su participación en la vía ubiquitina-proteasoma.

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Área de la Ciencia:

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

Sus antecedentes:

  • Las enzimas desubiquitinantes (Dubs) regulan la actividad y la abundancia de proteínas mediante la eliminación de la ubiquitina.
  • Las funciones, objetivos y regulación de la mayoría de los Dubs siguen siendo en gran medida no caracterizados.
  • La comprensión de Dubs es fundamental para descifrar la vía ubiquitina-proteasoma.

Objetivo del estudio:

  • Investigar sistemáticamente las funciones de los Dubs a través del análisis proteómico global.
  • Para identificar complejos proteicos asociados con Dubs.
  • Mapear el paisaje de interacción de Dub y colocar Dubs no estudiados en vías biológicas.

Principales métodos:

  • Desarrollo de la plataforma de software CompPASS para la medición de confianza de interacción imparcial.
  • Análisis paralelo no recíproco de datos proteómicos.
  • Integración de la ontología génica, la topología del interactoma, la localización subcelular y los estudios funcionales.

Principales resultados:

  • Identificación de 774 proteínas candidatas que interactúan asociadas con 75 Dubs.
  • La vinculación de Dubs a diversos procesos celulares, incluida la rotación de proteínas, la transcripción, el procesamiento de ARN, el daño al ADN y la degradación asociada a ER.
  • Descubrimiento de nuevas interacciones y complejos proteicos dentro del interactoma Dub.

Conclusiones:

  • Este estudio proporciona la primera visión completa del paisaje de interacción de Dub.
  • Los Dubs no caracterizados se colocan dentro de supuestas vías biológicas.
  • Se establecen nuevos conocimientos sobre los roles de Dubs en la vía ubiquitina-proteosoma.