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Videos de Conceptos Relacionados

Role of ER in the Secretory Pathway01:17

Role of ER in the Secretory Pathway

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Eukaryotic cells have a special pathway that enables communication between various intracellular membrane-bound compartments and also with the extracellular environment. This pathway is termed as the secretory pathway.
Components of the secretory pathway
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...
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Overview of Secretory Vesicles01:33

Overview of Secretory Vesicles

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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
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Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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COP Coated Vesicles00:59

COP Coated Vesicles

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Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
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Video Experimental Relacionado

Updated: May 6, 2026

Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient
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Múltiples neuropéptidos derivados de un precursor común se empaquetan y transportan de manera diferente.

J M Fisher1, W Sossin, R Newcomb

  • 1Department of Biological Sciences, Stanford University, California 94305.

Cell
|September 9, 1988
PubMed
Resumen

La prohormona de la hormona de puesta de huevos (ELH) produce péptidos que controlan el comportamiento de puesta de huevos en Aplysia. Estos péptidos se clasifican en distintas vesículas a través de un proceso que involucra la escisión temprana y la clasificación de Golgi, regulando sus niveles y localización.

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Cell Subtype-specific Analysis of Neuronal Membrane Proteasome in Somatosensory Neurons
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Área de la Ciencia:

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

Sus antecedentes:

  • La prohormona de la hormona de puesta de huevos (ELH) en Aplysia es un precursor de múltiples péptidos bioactivos.
  • Se sabe que estos péptidos regulan comportamientos complejos como la puesta de huevos.

Objetivo del estudio:

  • Investigar el procesamiento intracelular y los mecanismos de clasificación de los péptidos derivados de la prohormona ELH.
  • Comprender cómo estos mecanismos influyen en la localización y los niveles de estado estacionario de los péptidos individuales dentro de las neuronas.

Principales métodos:

  • Se empleó inmunocitoquímica cuantitativa para visualizar y cuantificar la distribución de péptidos.
  • Los experimentos se centraron en la escisión proteolítica y las vías de clasificación trans-Golgi.

Principales resultados:

  • El procesamiento de la prohormona ELH genera al menos nueve péptidos distintos.
  • Los péptidos se clasifican en clases específicas de vesículas, lo que sugiere un tráfico intracelular regulado.
  • Los péptidos amino-terminales (por ejemplo, los péptidos de células de bolsa) tienen niveles de estado estacionario más bajos que los péptidos carboxiterminales (por ejemplo, ELH).

Conclusiones:

  • El empaquetado intracelular y los mecanismos de enrutamiento juegan un papel crítico en la determinación de la localización diferencial y la abundancia de péptidos derivados de una sola prohormona.
  • Estos procesos son esenciales para regular la función neuronal y el comportamiento en Aplysia.