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Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
Protein Modifications in the RER01:26

Protein Modifications in the RER

Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
GPI Anchoring of Proteins in the ER Membrane01:29

GPI Anchoring of Proteins in the ER Membrane

GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
Transducer Mechanism: Enzyme-Linked Receptors01:27

Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
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Video Experimental Relacionado

Updated: Jun 29, 2026

Subcloning Plus Insertion (SPI) - A Novel Recombineering Method for the Rapid Construction of Gene Targeting Vectors
09:02

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Published on: January 8, 2015

El complejo p400 es un objetivo esencial de transformación E1A.

M Fuchs1, J Gerber, R Drapkin

  • 1Dana-Farber Cancer Institute, Boston, MA, USA.

Cell
|August 18, 2001
PubMed
Resumen

Los investigadores identificaron un nuevo complejo de proteínas de unión a E1A, crucial para la transformación mediada por E1A. El componente central, p400, y sus proteínas asociadas son vitales para este proceso, destacando su papel en la transformación celular.

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Biología celular Biología celular.
  • Oncología Oncología.

Sus antecedentes:

  • La proteína E1A es una oncoproteína viral clave conocida por inducir la transformación celular.
  • Comprender los mecanismos moleculares subyacentes a la transformación mediada por E1A es crucial para la investigación del cáncer.

Objetivo del estudio:

  • Identificar y caracterizar nuevos complejos proteicos que interactúan con E1A.
  • Para aclarar el papel de estos complejos en la transformación celular mediada por E1A.

Principales métodos:

  • Las pruebas de coinmunoprecipitación identifican a los socios de unión de E1A.
  • Caracterización bioquímica del complejo proteico identificado.
  • Ensayos funcionales utilizando mutantes E1A y fragmentos de proteínas para evaluar la actividad de transformación.

Principales resultados:

  • Identificación de un nuevo complejo de proteínas de unión E1A que contiene p400 como componente principal.
  • Demostración de que el complejo E1A-p400 es esencial para la transformación mediada por E1A.
  • Evidencia de que E1A y c-myc pueden modular la composición de las subunidades de los complejos p400.

Conclusiones:

  • El complejo E1A-p400 juega un papel crítico en el proceso de transformación de E1A.
  • Las alteraciones en la composición del complejo p400 por E1A y c-myc sugieren un papel en la supresión de la transformación.