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Related Concept Videos

Golgi Apparatus01:49

Golgi Apparatus

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As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are transported by microtubule-based motor proteins and fuse together to form vesicular tubular clusters, subsequently arriving at the Golgi apparatus, a eukaryotic endomembrane organelle that often has a distinctive ribbon-like appearance.
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Golgi Apparatus01:09

Golgi Apparatus

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Properly folded and assembled proteins are selectively packaged into vesicles that exit the ER. Motor proteins transport these vesicles to the Golgi apparatus for adding modifications that make these proteins functional at their destination.
The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...
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Golgi Apparatus01:09

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Golgi Matrix Proteins01:12

Golgi Matrix Proteins

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Golgi matrix proteins are a group of highly dynamic proteins that maintain the stacked structure of Golgi. These proteins adapt to rapid morphological changes of the Golgi during the cell cycle. During cell division, mild proteolysis removes these connections resulting in Golgi unstacking. In The daughter cells, these proteins help reassemble the unstacked Golgi.
One of the first identified Golgi matrix proteins was GM130, a rod-like protein located in the cis-Golgi. Subsequently, many Golgi...
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Transport Across the Golgi01:26

Transport Across the Golgi

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While it is unclear how molecules move between adjacent Golgi cisternae, it is apparent that the molecules move from cis- cisterna, the entry face, to the trans- cisterna, the exit face. Experiments initially suggested vesicles that bud from one cisterna and fuse with the next cisterna to transport proteins between the cisternae. This vesicular transport model describes the Golgi apparatus as a relatively static structure with a unique enzyme composition in each cisterna. Molecules are...
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Vesicular Tubular Clusters01:45

Vesicular Tubular Clusters

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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
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Quantitative Localization of a Golgi Protein by Imaging Its Center of Fluorescence Mass
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Golgi compartmentation and identity.

Effrosyni Papanikou1, Benjamin S Glick1

  • 1Department of Molecular Genetics and Cell Biology, The University of Chicago, 920 East 58th Street, Chicago, IL 60637, United States.

Current Opinion in Cell Biology
|May 21, 2014
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Summary
This summary is machine-generated.

The Golgi apparatus has three distinct cisternal maturation stages, each with unique membrane traffic patterns. These stages involve ER association, carbohydrate synthesis, and trans-Golgi network sorting, all regulated by GTPase cascades.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The Golgi apparatus is a key organelle involved in protein and lipid modification and transport.
  • Understanding the dynamic processes within the Golgi, such as cisternal maturation, is crucial for cell function.

Purpose of the Study:

  • To elucidate the distinct stages of Golgi cisternal maturation.
  • To describe the unique membrane traffic patterns associated with each stage.
  • To identify the molecular machinery coordinating these processes.

Main Methods:

  • Observational studies of Golgi apparatus structure and function.
  • Analysis of membrane trafficking pathways using vesicle markers.
  • Investigation of the roles of specific lipids, cytoskeletal elements, and GTPases.

Main Results:

  • Identified three distinct classes of Golgi cisternae corresponding to maturation stages.
  • Characterized unique membrane traffic patterns at each stage: ER association, COPI vesicle exchange, and TGN sorting.
  • Demonstrated coordination of these processes by Rab and Arf/Arl GTPase cascades.

Conclusions:

  • Golgi cisternal maturation proceeds through three defined stages.
  • Each stage involves specific membrane dynamics and molecular regulators.
  • GTPases play a central role in orchestrating Golgi function and membrane flow.