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Videos de Conceptos Relacionados

ER Retrieval Pathway01:45

ER Retrieval Pathway

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In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
The ER uses many checkpoints to prevent the entry of incorrectly folded or a resident protein as cargo onto a transport vesicle. These mechanisms...
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Export of Misfolded Proteins out of the ER01:32

Export of Misfolded Proteins out of the ER

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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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Clathrin Coated Vesicles01:12

Clathrin Coated Vesicles

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Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
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Protein Translocation Machinery on the ER Membrane01:28

Protein Translocation Machinery on the ER Membrane

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The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the...
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Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

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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...
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Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
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Video Experimental Relacionado

Updated: Mar 11, 2026

Analysis of Endocytic Uptake and Retrograde Transport to the Trans-Golgi Network Using Functionalized Nanobodies in Cultured Cells
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Mecanismo estructural para el reconocimiento de la carga por el complejo de retrómeros

María Lucas1, David C Gershlick2, Ander Vidaurrazaga1

  • 1Structural Biology Unit, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain.

Cell
|November 28, 2016
PubMed
Resumen

La disfunción del complejo de proteínas retrómeras está relacionada con enfermedades neurodegenerativas. Este estudio revela cómo el retrómero reconoce la carga, un paso crucial para el reciclaje celular y la comprensión de los mecanismos de la enfermedad.

Palabras clave:
reconocimiento de cargaReciclaje endocítricoLos endosomasReclutamiento por membranaTubos de membranaLas capas proteicasTransporte retrógradoel retrómerordenamiento de los nexinsseñales de clasificación

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Área de la Ciencia:

  • Biología celular
  • Biología estructural
  • La neurociencia

Sus antecedentes:

  • El retrómero es un complejo multiproteico vital responsable del reciclaje de las proteínas transmembrana.
  • El retrómer disfuncional está implicado en las enfermedades de Alzheimer y Parkinson.
  • Los mecanismos de reconocimiento de carga de retrómeros y reclutamiento endosómico siguen sin estar claros.

Objetivo del estudio:

  • Para aclarar la base estructural del reconocimiento de carga de retrómeros y el reclutamiento de membranas.
  • Para investigar la interacción entre las subunidades del retrómer, SNX3, y la carga.

Principales métodos:

  • Se empleó la cristalografía de rayos X para analizar un complejo de cuatro componentes.
  • El complejo incluía VPS26, VPS35, SNX3 y una señal de reciclaje DMT1-II.

Principales resultados:

  • Se identificó un nuevo sitio de unión para las señales de reciclaje en la interfaz VPS26-SNX3.
  • Se revelaron interacciones cooperativas entre las subunidades de retrómeros, SNX3, y la carga.
  • Estas interacciones vinculan el reconocimiento de la señal de carga con el reclutamiento de la membrana.

Conclusiones:

  • El estudio proporciona información estructural sobre el mecanismo de reconocimiento de carga del retrómer.
  • Comprender estas interacciones es crucial para abordar la disfunción de los retrómeros en la enfermedad.
  • Este trabajo sienta las bases para futuras estrategias terapéuticas dirigidas al retrómero.