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The Endoplasmic Reticulum01:43

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The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...
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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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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.
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Yeast Signaling01:28

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Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
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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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Related Experiment Video

Updated: Jan 11, 2026

Nanogold Labeling of the Yeast Endosomal System for Ultrastructural Analyses
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Rethinking the Yeast Endomembrane System.

Benjamin S Glick1

  • 1Department of Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL, USA. bsglick@uchicago.edu.

Sub-Cellular Biochemistry
|November 15, 2025
PubMed
Summary
This summary is machine-generated.

Budding yeast studies reveal new insights into the endomembrane system. Time-lapse imaging revises long-standing assumptions about endocytic compartments and Golgi protein traffic, impacting cell biology understanding.

Keywords:
AP-1Cisternal maturationEndocytic pathwayEndosome maturationEndosomesGolgiSecretory pathwayYeast

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Yeast Genetics

Background:

  • The endomembrane system in Saccharomyces cerevisiae comprises secretory, endocytic, and autophagic compartments.
  • Membrane traffic and dynamic transformations are key to endomembrane system function.
  • Previous research has identified components and mechanisms but left high-level questions unanswered.

Purpose of the Study:

  • To investigate the identities and life cycles of endocytic compartments in yeast.
  • To elucidate the traffic pathways of resident Golgi apparatus proteins.
  • To revise existing models of the yeast endomembrane system.

Main Methods:

  • Utilizing time-lapse imaging techniques.
  • Observing endosome and Golgi compartments in budding yeast (Saccharomyces cerevisiae).
  • Analyzing membrane traffic dynamics and protein localization.

Main Results:

  • New data challenges several established assumptions about the yeast endomembrane system.
  • The study provides an updated model for endomembrane organization and function.
  • Specific details on endocytic compartment dynamics and Golgi protein trafficking are presented.

Conclusions:

  • Findings necessitate a revision of current understanding of the yeast endomembrane system.
  • The research offers a new synthesis of endomembrane dynamics.
  • This work has implications for understanding conserved endomembrane system features across eukaryotes.