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Protein Complex Assembly02:41

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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.
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Maturation of Endosomes01:28

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The early endosome containing internalized molecules matures through transformations in its location, morphology, intraluminal pH, and membrane protein composition. Together, these changes result in a more acidic late endosome that contains multiple intraluminal vesicles; therefore, the late endosome is also called a multivesicular body (MVB).
Changes in location
The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...
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The Early Endosome: Endocytosis of Transferrin01:28

The Early Endosome: Endocytosis of Transferrin

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Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
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Recycling Endosomes and Transcytosis00:58

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The recycling endosome, also known as the endosomal recycling compartment (ERC), is a part of the slow-recycling process of the endocytic pathway. Molecules internalized through receptor-mediated endocytosis are either degraded in the lysosomes or are recycled to the plasma membrane through the fast- or slow-recycling route.
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While the differential rate law relates the rate and concentrations of reactants, a second form of rate law called the integrated rate law relates concentrations of reactants and time. Integrated rate laws can be used to determine the amount of reactant or product present after a period of time or to estimate the time required for a reaction to proceed to a certain extent. For example, an integrated rate law helps determine the length of time a radioactive material must be stored for its...
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Spindle Assembly02:50

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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
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Updated: Jan 22, 2026

The Microscopy-Based Assay to Study and Analyze the Recycling Endosomes using SNARE Trafficking
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Las asambleas BORC integran subunidades de BLOC-1 para diversificar las funciones del tráfico endosómico

Mariana E G de Araujo1, Sascha J Amann2,3, Taras Stasyk1

  • 1Institute of Cell Biology, Biocenter, Medical University of Innsbruck, Innsbruck 6020, Austria.

Proceedings of the National Academy of Sciences of the United States of America
|January 20, 2026
PubMed
Resumen

El estudio revela la estructura octamérica de BORC y demuestra que BORC y BLOC-1 pueden formar complejos híbridos, desafiando sus roles distintos en el tráfico endolisosomal y sugiriendo un ensamblaje dinámico para funciones celulares.

Palabras clave:
BLOC-1BORCEARPlisosomaendosoma de reciclaje

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Área de la Ciencia:

  • Biología Celular
  • Biología Molecular
  • Biología Estructural

Sus antecedentes:

  • BORC y BLOC-1 son complejos multisuبunidad involucrados en el tráfico endolisosomal.
  • Sus orígenes paralogos y subunidades compartidas sugieren interacciones potenciales o ensamblaje de orden superior.

Objetivo del estudio:

  • Elucidar la arquitectura estructural de BORC.
  • Investigar el potencial de formación de complejos híbridos entre BORC y BLOC-1.
  • Comprender la regulación y las implicaciones funcionales de estos complejos en el tráfico celular.

Principales métodos:

  • Se determinó la arquitectura octamérica conservada de BORC utilizando técnicas de biología estructural.
  • Se empleó espectrometría de masas de entrecruzamiento para validar el modelo de BORC en células humanas.
  • Se realizaron análisis bioquímicos y estructurales para identificar y caracterizar complejos híbridos BORC-BLOC-1.

Principales resultados:

  • Se reveló la estructura octamérica conservada de BORC, compuesta por dos tetrámeros entrelazados.
  • Se validó la estructura de BORC en complejos humanos y se identificaron residuos clave para la integridad y el transporte lisosomal.
  • Se proporcionó evidencia de complejos híbridos BORC-BLOC-1, vinculándolos al reciclaje del receptor de transferrina a través del complejo EARP.

Conclusiones:

  • BORC y BLOC-1 no son entidades distintas, sino que pueden formar complejos híbridos dinámicos.
  • El ensamblaje modular de estos complejos permite la especialización funcional en el tráfico endolisosomal.
  • La comprensión de estos complejos ofrece información sobre mecanismos de enfermedades y regulación celular.